Unveiling Nephroprotective,Diuretic and Toxicity Response of Pinus roxburghii Sarg. Extract by In-vitro,In-vivo and Docking Techniques

Abstract

Objective

Pinus roxburghii Sarg. (Pinaceae) has shown useful effects in the treatment of urinary problems. This research aimed to explore P.roxburghii scientifically via in-vitro, in-vivo and in-silico techniques to find out its therapeutic benefits on kidney and bladder.

Method

Pharmacologically active components of aqueous ethanolic extract of P.roxburghii were analyzed by HPLC-DAD screening. These components were predicted for multfi-mechanisms and spasmolytic effects in network pharmacology. In-vitro experiments were conducted on isolated bladder of rat to analyze the spasmolytic effects of plant extract. Spasmolytic effects were also compared with the standard drugs verapamil and oxybutynin In-vivo experiments were also performed to observe diuretic and nephroprotective potential of the plant.

Result

Phytochemical analysis indicated the presence of chlorogenic acid, gallic acid, P-coumaric acid, kaempferol, salicylic acid, sinapic acid and benzoic acid. Aqueous ethanolic extract of plant relaxed the contractions induced by high K⁺ (80 mm) and carbachol (1 µM) in isolated urinary bladder strips of rat. In-vivo experiments revealed the nephroprotective and diuretic potential.

Conclusion

So it has been proved via scientific evidence that the concerned plant possesses spasmolytic, nephroprotective and diuretic potential and may be an important therapeutic agent against urinary problems in the near future.

Graphical Abstract

Keywords

nephropathy diuretics network pharmacology chronic kidney disease

Introduction

Pinus roxburghii, (Pinaceae) is an elevated tree having prolong crown at the height of 450 m to 2400 m. These trees are located from Kashmir to Bhutan.¹ Bark of the tree is hard and reddish brown in appearance. Winter buds are small, ovoid and brownish in color. These buds have no resin in them. Plant has needle shaped leaves. The needles are arranged in flabellate triangular. Three needles are arranged in a bundle and in cross section, they are cylindrical. Cones are short, ovoid and pedunculated having range of 10-15 into 6-9 cm.² Pinus roxburghii has many pharmacological benefits, including anti-inflammatory, anti-asthmatic, anticonvulsant, analgesic and anti-dyslipidemia characteristics.³ It has been stated that many parts of tree have been commonly utilized in traditional medicine for treating conditions such as cold, cough, influenza, tuberculosis well as for their diaphoretic, diuretic, stimulant, vermifuge and rubifacient properties. The paste of the bark is utilized to treat burns as well as scalds. Barks can be beneficial to treat skin diseases and cracks. Resin is used to treat boils. Wood oil has hemostatic, nerve tonic and expectorant properties. Turpentine oil which is derived from plants is used as an expectorant in case of chronic bronchitis. It is also utilized as an anti-septic. The plant has also demonstrated dyslipidemia and anti-oxidant activity.⁴ It is also used to relieve itching and as a remedy for snake bites. Plant has been identified for having anti-cancer properties.⁵ It has also shown acaricidal effects.⁶ Resin of the concerned plant has also shown protective potential to treat gonorrhea. It has also been indicated to possess hepatoprotective effect.⁷ Folklore reports also suggest its utilization to treat inflammation, urinary discharges and piles. It has also displayed beneficial effect regarding genito-urinary disorders.⁸ Despite rapid progress in science and technology, due to traditional medication paradigm ie, single medicine, target and disease, pharmaceutical industries are facing challenges.⁹ In the field of network pharmacology, genes which interacts with other genes are termed as hub genes, play an important role in biological systems.¹⁰ In the present study pharmacological profile of P.roxburghii and the mechanisms underlying its nephroprotective effects were validated by in-vivo, in-vitro and network pharmacological approaches.

Materials and Methods

Plant Extract Preparation

Needles and stem of the plant were obtained from Bahauddin-Zakariya University, Multan Pakistan. The plant (card number https://www.theplantlist.org/tpl1.1/record/kew2562199) was identified by Professor Zafar Ullah Zafar, Department of Botany, Bahauddin Zakariya University, Multan. Needles and stem were dried in shade for 2 months. Dried needles and stem were ground into powders by using herbal grinder. One kilogram of this powder was soaked in a solution containing 80% ethanol and 20% distilled water. The mixture underwent triple maceration with intermittent shaking. Wet part of the plant was separated by using muslin cloth for filtration. After this, it was filtered byWhatman filterpaper. The filtrate was further treated at a temperature of 30 to 40°C using a rotary evaporator (BUCHI) with reduced pressure. Obtained extract was stored at 20°C for future use.¹¹ It took about 1 year and 3 months to complete the whole research.

Chemicals

Chemicals used in the study were of a purified level including solutions such as 0.9% Sodium chloride, Sodium bicarbonate,formalin,KCl,CaCl₂, anhydrous Magnesium sulphate,C₂H₅OH,ethyl acetate and CHCl₃.The above mentioned chemicals were purchased from Jiangyin Lanyu chemical Co, China. Carbachol and verapamil HCl were purchased from Sigma Chemicals Co St. Louis, MO.

Screening of Phytoconstituents

The ethanolic plant extract was analyzed in the laboratory to determine the existence and absence of various secondary metabolites of plants. The extract was analyzed with Mayer’s reagent, Wagner reagent and Dragendroff reagent to determine if alkaloid were present.¹² An alkaline reagent test was conducted to confirm the existence of flavonoids. The ferric chloride test was conducted to find out the presence of tannins and phenolic compounds.¹³ To identify the presence of glycosides, Keller Killiani test was performed.¹⁴ The froth test was conducted to detect the presence of saponins.¹⁵

Screening for Bioactive Compounds Using HPLC

Different standards were utilized for HPLC analysis. Chlorogenic acid, kaempferol, para coumaric acid, salicylic acid, benzoic acid, sinapic acid and gallic acid were utilized as reference. A mobile phase was prepared using 0.1% acidified water and acetonitrile. A 5 µm Eclipse C18-Zorbax plus C18 column, measuring 4.6 × 150 mm was used for the process of separation. The rate of flow was 1 ml per min.

Ethical Statement and Experimental Animals

All animal experiments complied with the ARRIVE guidelines and were carried out according to the U.K. Animals (Scientific Procedures) Act, 1986 and associated guidelines, EU Directive 2010/63/EU for animal experiments, or the National Institutes of Health guide for the care and use of Laboratory Animals (NIH Publications No. 8023, revised 1978). Animals were handled with great care while experimentations were executed according to drafted rules of life sciences of animal resources commissioned by the Laboratory of Bahauddin Zakariya University as authorization committee to the ethical institution of Multan (EC/06 PhL-2019-2021). BALB/c mice weighing between 15-30 g and Sprague-Dawley rats of either sex weighing between 155-200 g were utilized for both in vitro and in vivo studies. At the end of in vivo experiments, both mice and rats were euthanized using cervical dislocation. The animals were housed in a standard environment and given the controlled diet.

Inclusion/Exclusion Criteria

Inclusion criteria of the animals include:

(1) weight of animals (mice) was in the range of 15-30 g and strain was BALB/c.

(2) Weight of animals (rats) was in the range of 155-200 g and the strain was Sprague-Dawley.

(3) Animals were healthy and free of any underlying diseases.

Exlusion criteria of the animals include:

(4) Animals with pre-existing kidney disease or renal impairment.

(5) Animals with signs of inflammation or infection.

(6) Animals with tumors or cancer.

Animal and Sample Size Calculation

Number of animals were calculated on the basis of reported literature and already reported activities(16-19).Total 70 animals were used in 14 groups. .For Toxicological studies(acute + subacute), 6 groups were made wheras 4 groups were made for Nephroprotective as well as Diuretic activity(each group = 5 animals)

In-Vitro Experiment on Isolated Tissue

In the experiments of isolated tissues, we followed our initially developed protocols.¹⁶

Preparation of urinary bladder strips and experimental set-up

Krebs solution was used to fill aerated organ baths. The water pump was turned on to circulate and heat the chambers to 37 degrees Celsius. 1 g weight was used to calibrate the transducers. The dissection area was set up, and the required tools were employed, such as 2 dissecting forceps, a scalpel blade, micro scissors, electric razors, and forceps with teeth. In the induction chamber, chloroform was used to anesthetize the animal. The lower abdomen of the animal was shaved after it was put to sleep. An abdominal incision made in the midline revealed the pelvic organs. By making a cut at the neck of the bladder near the proximal urethra, the bladder was located and removed. The tissue was submerged right away in an aerated Krebs solution, and the connective tissues and lipids were extracted. To make a flat sheet, the urinary bladder was opened from the base to the dome. The tissue was divided longitudinally into 2-3 mm strips. The strips were placed in the aerated Krebs solution-filled experimental organ baths. A force transducer was attached to 1 end of the strip. A fixed metal rod was attached to the opposite end. Each strip received a certain amount of force by gradually stretching the tissue until the baseline tension reached 1 g.

The aerated Krebs solution was used to wash the tissue strips every 30 min. The tissue was given 2 h to acclimate until no more tissue relaxation was noticed. The signals were intensified by Power Lab data acquisition system (AD Instrument, Bella Vista, NSW, Australia) and shown using lab chart pro (Version 7). In order to cause contractions in bladder strips, both K+ (80mm) and carbachol (1 µm) have been utilized. It was found that the P. roxburghii extract had an antispasmodic effect. A reference drug for observing anti-muscarinic action was oxybutynin. To determine whether the extract had a calcium channel blocking action, verapamil was employed as a standard. The effects of carbachol + extract and oxybutynin + extract, high K+ extract and verapamil + extract was compared.

In Vivo Experiments

Sub-acute Toxicity Studies

Three groups of Swiss albino mice had been formed. There were 5 mice in the first group. The negative control group was the first group. It was given a standard saline treatment. Doses of 250 mg/kg were given to the second group, and 500 mg/kg were given to the third 1. Prior to the trial commencing, these animals were fasted for a whole night. Over the course of 28 days, doses were given every day. Every alteration in the experimental animals’ skin tone, gait, weight, food consumption, behavior, and mortality was noted. Hematological examination was also performed. Organs were taken out at the end of experiment so they could be examined histologically.¹⁷

Acute Toxicity Studies

Acute toxicity analysis: Swiss Albino mice (25-30 g) were used to test the acute toxicity profile of the plant extract under the necessary and standard conditions. Prior to the trial, they were fasted for the entire night. The animals were divided into 3 groups. There were 5 creatures in 1 group. Normal saline was administered to the first group. A single intraperitoneal dosage of 750 mg/kg for Group 2 and 1000 mg/kg for Group 3 had been administered, and the mortality and behavioral changes were tracked for 4 h. The animals were weighed before receiving normal saline and plant extract for the course of the 14 day study period. By the time the trial was over, the animals’ weight was also noted. Every day, the animals were observed to look for any changes in behavior. On the final day of the experiment, organs were removed for histological examination and dissection was completed.¹⁷

Protocol of Nephroprotective Effects

Both male and female rats weighing between 150 and 200 g were utilized to assess the renal protective effect of Pinus roxburghii Sarg. Before the experiment began, every animal used in it was hungry. There were 4 groups of 5 animals in each group. For a period of 14 days, Group 1 (seen as the negative control) was given regular saline. As the experiment’s positive control group, Group 2 was given a dose of 5 mg/kg cisplatin on first day. The animals were given an intraperitoneal injection of cisplatin. Cisplatin (5 mg/kg) was given to Group 3, and on the following days, 400 mg/kg of extract was delivered. Cisplatin at a dose of 5 mg/kg was also given to Group 4, and on the remaining days, a dose of 600 mg/kg of plant extract was provided. On the 15th day, the animals’ kidneys were removed for histological examination and blood was drawn from the periorbital area.¹⁸

Protocol for the Estimation of Diuretic Activity

Twenty albino rats weighing 140-200 g were used in this investigation. The animals underwent a 15 day acclimation period in regular housing prior to the trial. Four groupings were used to classify the animals. As the negative control group, Group 1 was given regular saline. Furosemide injections (10 mg/kg) were given intraperitoneal to Group 2, which served as the positive control group. Group 3 received a low dose of extract orally, while Group 4 received a large dose of ethanolic extract orally. Following treatment, each animal received a regular saline hydration and was housed in a single metabolic cage that was specifically constructed to keep excrement and urine apart. The collection of urine lasted for 5 h. During the diuretic procedure, food or water were not supplied to the animals. Upon completion of the study, a number of parameters were assessed, including the amount of Na⁺, K⁺ and Cl^- excreted in urine of animals, as well as the total amount of urine produced. Diuretic activity and impact were also ascertained.¹⁹

Histological Examination

After the in-vivo trials concluded, the target animals were sedated, and the right and left kidneys and liver for the toxicological and nephroprotective studies were removed. Blood had been cleaned off with regular saline. Organs were kept for histological analysis in formalin. Utilizing an Olympus digital camera and Olympus light microscope ( × 400), the histopathology examination was completed.

Network Pharmacology

Phytoactive components of Pinus roxburghii needles and stems were gathered from various published databases (Science direct, google scholar, PubMed, etc.). A free online programming tool: swissadme was used to determine the oral bioavailability (OB) of the Phytoactive constituents. Drug likeness (DL) was calculated through the molsoft (https://molsoft.com/mprop/). Compounds were screened according the ADME standards which includes DL ≥0.18 and OB ≥0.3.²⁰Nephroprotective and diuretic related target genes were identified through Gene Cards (https://www.genecards.org), OMIM(https://omim.org),DisGeNet(https://www.disgenet.org/search) databases. SWISS target prediction online tool was used to identify the therapeutic genes of screened compounds(https://www.swisstargetprediction.ch/)Bioinformatics and evolutionary genomics tool (an online tool) was used to determine the intersection of common genes from Compound therapeutic genes, DisGeNet and Gene Cards (https://bioinformatics.psb.ugent.be/webtools/Venn/).²¹String.embl database was used to construct the protein-protein interaction (PPI) network of intersect genes with high scores ie,≥0.9), by limiting the specie selection to Homo sapiens. The PPI network generated from String data base was subjected to Cytoscape software 3.10.1 for additional analysis. CytoHubba plugin analyzed the network and top ten hub genes were chosen on the basis of degree value. DAVID (https://david.ncifcrf.gov/) was used for Geno Ontology (GO-enrichment) analysis and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways.²²

Statistical Studies

The complete set of data (mean ± S.E.M., n = 5) was subjected to one-way analysis of variance, or ANOVA. In order to ascertain the methodological significance between various experimental groups, Dunnett test was conducted in conjunction with it. Data was deemed statistically significant when P < 0.05. For concentration response curves, logarithmic sigmoidal dosage response graphs were generated. The software used for all statistical plotting and analysis was graph pad prism (Version 8.0).

Results

Pilot Phytochemical Analysis

The results of various phytoanalysis tests showed that the plant’s ethanoic extract included carbohydrates, alkaloids, flavonoids, saponins, and tannins.

Analysis of Ethanoic Extract of Pinus roxburghii by HPLC

Through HPLC examination, many chemicals were identified. The chromatogram showed the substances that were detected, including benzoic acid, salicylic acid, kaempferol, sinapic acid, P-coumaric acid, and chlorogenic acid. Figure 1A and B

Figure 1.

(A) Graphical Results of HPLC Analysis. (B) HPLC Chromatogram of Ethanolic Extract of P.Roxburghii, *R. T ≈ Retention Time

Findings of Toxicological Research

Acute Toxicity Studies

Behavior of objective animals has not changed, according to the current research. During the course of the trial, when plant extract doses of 750 mg and 1000 mg/kg were administered, every animal survived. The results indicated that the LD50 was more than 1000 mg/kg. The animals’ weight was somewhat higher than the usual group’s, as were the organs that were removed (liver and kidney) as represented in Table 1.

Table 1.

Results of Acute Toxicity Studies

Parameters	Control Group	High dose of extract 1000 mg/kg	Low dose of extract 750 mg/kg
final Weight of body(g)	30.51 ± 1.2	42.5 ± 0.4^*	35.8 ± 2^#
weight Of liver(g)	1.95 ± 0.006	2.5 ± 0.006^*	2.25 ± 0.006^*
weight Of left kidney(g)	0.33 ± 0.006	0.3 ± 0.004^*	0.33 ± 0.004^*
weight Of right kidney(g)	0.33 ± 0.006	0.2 ± 0.006^*	0.38 ± 0.004^*

The values are represented as Mean ± S.E.M. To interpret data by comparing with the control group, t test was applied.

P* < 0.0001: data is significant as compare to control group.

#: data is not significant as compare to control group.

Influence of Plant Extract on Behavior of Animals

There were no discernible behavioral changes at the end of the studies. No mortality was observed. Although the test animals were hyperactive during the trial but this behavior was not observed in the control group.

Findings of Histopathology

The experimental animals’ slides resembled almost exactly with those of the control group. There was no discernible change in color, morphology or shape. Outcomes were very similar to those of control group. There was no sign of necrosis or apoptosis as represented in Figure 2. It is possible to argue that the plant extract does not harm the liver or kidney tissues. The glomerulus, interstitial tissues, and renal tubules were all within normal limits. There was no evidence of hepatic or renal tissue inflammation.

Figure 2.

Histopathological Analysis of Acute Toxicity Studies in Tissues of Mice ^*CV = Central Vein, DC = Distal Convoluted Tubule, PC = Proximal Convoluted Tubule

Findings of Sub-acute Toxicological Research

Impact of Plant Extract on Histopathological Findings and Hematological Parameters

Blood values of treated groups were found to be within the reference range. Leukocyte, erythrocyte, and platelet counts were found to slightly rise at varying doses of sub-acute toxic groups in comparison to the control group. The count is within an acceptable range, though. However, compared to the control group, the treated groups’ lymphocyte count grew noticeably. (Table 2). This could be because plant have immunomodulatory properties.²³ Histopathological analysis also revealed no harmful effects on liver and kidney (Figure 3).

Table 2.

Impact of Plant Extract on Hematological Findings

Parameters	Control group	250 mg/kg extract	500 mg/kg extract
WBC count (10³/µl)	5.2 ± 0.22	5.5 ± 0.15^#	5.7 ± 0.17^#
RBC count (10⁶/µl)	5.37 ± 0.1	8.5 ± 0.01^*	9 ± 0.01^*
Platelet count (10³/µl)	131.5 ± 0.6	146.5 ± 0.6^*	156.5 ± 0.6^*
PCV/HCT (%)	43.5 ± 0.6	45.25 ± 1.9^#	46.75 ± 1.4^#
Hemoglobin (g/dl)	15 ± 0.6	14 ± 0.6^#	13 ± 0.4^*
MCHC (g/dl)	33.7 ± 1.4	31.5 ± 1.0^#	34.5 ± 1.3#
Lymphocytes (%)	44.5 ± 1.7	87.75 ± 0.6^*	94 ± 1.2^*

The values are represented as mean ± S.E.M. To interpret data by comparing with the Control group, Dunnett’s test had been applied.

P* < 0.0001: data is significant as compare to control group.

#:data is not significant as compare to control group.

Figure 3.

Histopathological Findings of Tissues of Mice

Findings of Nephroprotective Activity

Impact of Plant Extract on Weight of the Body

A single dose of cisplatin (5 mg/kg i.p.) induced nephrotoxicity. Weight loss has been observed in the group receiving cisplatin treatment. However, following cisplatin induced nephrotoxicity, co-administration of extract reduced the weight loss of animals indicated in Table 3.

Table 3.

Effects of Plant Extract on Weight of the Body

Weight of animals	Days of observation
Groups	0	7	14
Control	119 ± 2	122 ± 2	123 ± 2
Cis	145 ± 6	121 ± 8	108 ± 9
Cis + Pr1	124 ± 4	113 ± 3	120 ± 2
Cis + Pr2	157 ± 11	131 ± 11	143 ± 10

Mean ± SEM (n = 4), where Cis = cisplatin (5 mg/kg), Cis + Pr¹ = cisplatin + plant (400 mg/kg/14 days), Cis + Pr² = cisplatin + plant extract (600 mg/kg/14 days

Impact of P. roxburghii Extract on Renal Weight of Rats

Rats treated with cisplatin had heavier kidneys than the control group, according to Observations. The administration of various extract doses combined with cisplatin resulted in a considerable reduction in kidney mass. (Table 4, Figure 4A).

Table 4.

Impact of Plant Extract on Kidney Weight, Plasma Creatinine, Plasma Na⁺ and K⁺ of Animals

Group	Kidney weight(g)	Plasma creatinine(mg/dl)	Plasma Na+ (mEq/L)	PlasmaK+ (mEq/L)
Control	0.57 ± 0.02	0.86 ± 0.006	137 ± 0.74	9 ± 0.06
Cis	1.76 ± 0.01^*	2.2 ± 0.006^*	109 ± 1.4^*	10.3 ± 0.06^*
Cis + Pr1	0.69 ± 0.01^#	1.8 ± 0.04^#	156 ± 1.2^#	6 ± 0.04^#
Cis + Pr2	0.53 ± 0.01^#	1.2 ± 0.06^#	164 ± 2^#	6.0 ± 0.1^#

Mean ± SEM, (n = 4), and Cis: cisplatin (5 mg/kg), Cis + Pr¹: cis + plant extract (400 mg/kg/14 days).

Cis + Pr²: cis + plant extract (600 mg/kg/14 days. Results are considered significant (*) if P < 0.0001.

*P < 0.0001 vs control.

#P < .0001 vs Cis.

Figure 4.

Graphical Representation of Impact of Herbal Extract on Kidney Weight, Plasma Creatinine, Plasma Na⁺ and K⁺ of Animals

Impact of Plant Extract on Plasma Creatinine

The effect of plant extract on the plasma creatinine of animals given cis is shown in the table. After the plant extract was administered for 14 days, results were obtained. In conclusion, cisplatin treatment raised the plasma creatinine level. However, at doses of 400 and 600 mg/kg, co-administration of Cis + Pr¹ and Cis + Pr² significantly decreased the level of creatinine in plasma. (Table 4, Figure 4B).

Impact of Plant Extract on Plasma Na+ of Cis-Treated Animals

The effect of plant extract on sodium levels in the plasma of the experimental groups is shown in the table no 4. Overall, cisplatin treatment decreased the amount of sodium in plasma, but when Cis + Pr¹ and Cis + Pr² were given together at rates of 400 mg/kg and 600 mg/kg, the amount of Na⁺ in plasma increased dramatically. (Table 4, Figure 4C).

Influence of Plant Extract on Plasma K⁺ of Cis-Treated Rats

The effect of extract on potassium in the plasma of experimental animals receiving Cis is shown in the table. Overall, cisplatin therapy disrupted the potassium content in plasma; however, co- administration of Cis + Pr¹ and Cis + Pr² at 400 mg/kg and 600 mg/kg,markedly improved the concentration of K⁺ in plasma of treated animals.(Table 4, Figure 4D)

Histopathological Analysis of Kidneys

The normal group did not exhibit any abnormalities, according to a histological investigation of kidney tissues from slides belonging to several experimental animal groups. The glomeruli and Bowman capsule were both intact and in a normal state. Both the proximal and distal tubules’ textures were typical. There was no evidence of bleeding, interfacial damage, or obstruction in the control group. While cisplatin-treated group displayed many degenerative alterations. The collecting tubules were necrotic and the glomerulus was atrophied. Additionally, glomerular hypertrophy was noted. However, tubules with intact glomerulus revealed modest histological damage after 400 mg/kg of Pr and Cis.Conversely, the treatment of Cis + Pr at a dose of 600 mg/kg reduced the harm caused by cisplatin. There was little damage to the distal and proximal tubules. These facts are shown in Figure 5.

Figure 5.

(A) Photomicrography of Renal Parts of Rats Control. (B) Cis. (C) Cis + Pr¹(400 mg/Kg). (D) Cis + Pr ² (800 mg/Kg) BC: Bowman’s Capsule, RT: Renal Tubules, AG: Atrophied Glomerulus

Findings of Diuretic Effect

Impact of Plant Extract on Urine Output and Diuretic Action in Animals

The specifics of urine volume, diuretic action, and diuretic activity has been shown below. 1.93 was the maximum diuretic action produced by the standard group. The diuretic effect of P.roxburghii 600 mg/kg was 1.57, the highest value after furosemide. Similar to the standard group, Roxburghii 600 mg/kg exhibited a diuretic activity of 0.81 which is comparable to the standard group. (Table 5)

Table 5.

Impact of Plant Extract on Urine Output and Diuretic Action in Rats

Groups	Urine volume	Diuretic action^a	Diuretic activity^b
Control	2.5 ± 0.4	1.00
furosemide(10 mg/kg)	4.9 ± 0.1*	1.93	1
Low dose of plant extract (200 mg/kg)	2.9 ± 0.1#	0.05	0.59
High dose of extract (600 mg/g)	4 ± 0.2*	1.57	0.81

The values are expressed as mean ± SEM.To interpret data by comparing with Control group, Dunnett’s test had been applied.

P* < 0.05: data is significant as compare to control group.

#: data is not significant as compare to control group.

^adiuretic action is urine volume of Test group divided by urine volume of control group.

^bdiuretic activity is urine volume of Test group divided by urine volume of Standard group.

Impact on Electrolyte Excretion

The table displays the electrolyte excretion results in urine following the administration of plant extract. When comparing the treated groups’ excretion of potassium and chloride to the control group, no discernible differences were seen. High extract doses did, however, cause statistically significant natriuresis (P < 0.05), though not as much as the positive control group. Additionally, the Sal-uretic index was computed in order to do additional research. The ionic ratio of each group to the control group was calculated for the procedure. The high dose of extract’s sodium to potassium ratio and carbonic anhydrase inhibitory activity exhibited similar trends as the positive standard group Table 6.

Table 6.

Effect on Excretion of Electrolyte

Groups	Na+ mmol/l	K+ mmol/l	Cl- mmol/l	Na+ index^a	K+ index^a	${C l}^{-}$ Index^a	Na+/k.+	Cl-/(Na++K+)
Control. (10 ml/kg)	178 ± 2	58 ± 0.70	101.6 ± 0.92	1	1	1	3	0.43
Standard (furosemide 10 mg/kg)	208.5 ± 0.6^*	60 ± 0.70^#	104.2 ± 1.59^#	1.17	1.03	1.02	3.5	0.39
Low dose of extract (200 mg/kg)	177.0 ± 0.4^*	56 ± 0.70^#	90.20 ± 0.86^*	0.99	0.96	0.8	3.1	0.38
High dose of extract (600 mg/kg)	198.5 ± 0.6^*	55.4 ± 0.50^#	100 ± 0.70^#	1.12	0.96	0.98	3.5	0.39

The values are represented as mean ± SEM.To interpret data by comparing with Control group, Dunnett’s test had been applied.

P* < 0.05: data is significant as compare to Control group.

#: data is not significant as compare to Control group.

^aexcretion in Test group/excretion in Control group.

Results of in Vitro Studies

Impact on Isolated Urinary Bladder of Rat

Rat bladder strips were subjected to an ethanolic extract of P.roxburghii in order to examine the plant’s anti-spasmodic effects on the bladder’s muscles. The plant extract had calmed the contractions brought on by high K+ (80 mm) and carbachol (1 µm). At 3 mg/mL, the spasm brought on by the administration of (CCh) carbachol(1 µm) had subsided. The common medication oxybutynin also relieved contraction brought on by CCh at a dosage of 0. 3 µm, oxybutynin promoted relaxation. At a concentration of 1 mg/mL, plant extract reduced the spasms brought on by the administration of high K+ (80 mM). At a dose of 0.1 µM, the standard medication verapamil similarly eased the spasms brought on by high K+. In the illustration, representative tracings (Figure 6A–D) and graphs (Figure 7A, B) are shown.

Figure 6.

Tracings Representing. (A) Response of Plant Extract Regarding CCh Induced Spasm. (B) Response of Oxybutynin Regarding CCh Induced Spas. (C) Response of Plant Extract Regarding High K+ Induced Spasm. (D) Response of Verapamil Regarding High K+ Induced Spasm

Figure 7.

(A) Dose Response Curve Plotted for Spasms Caused by CCh and Relaxation Induced by Plant Extract. (B) Dose Response Curve Plotted for Spasms Produced by CCh and Rselaxation Caused by Oxybutynin

Network Pharmacology

A total of 57 phyto-active compounds were screened, and 5 of them met the SWISS ADME standard (Table 7). 359 potential therapeutic genes were identified through Swiss target prediction. Gene Card and OMIM showed 3810, whereas, DisGeNet yielded 393 potential nephrotic genes. Interactive mapping of Target nephrotic genes, and compounds therapeutic genes and DisGeNet showed 30 common targets (Figure 8). A Protein-protein interaction network using a string database was mapped to observe the association among the common genes (Figure 8B). Protein-protein interaction network was further analyzed through Cytoscape. The cytohubba plugin network analyzer identified top ten nephrotic related Hubba genes based on degree method (Table 8; Figure 9).

Table 7.

Potential Bio-Active Compounds

Compounds	PubChem ID	CS	Molecular formula	MW	DDL	OB
1-Hexacosanol	68171	CCCCCCCCCCCCCCCCCCCCCCCCCCO	C₂₆H₅₄O	382.71	0.29	0.55
β-Sitosterol	222284	CCC(CCC(C)C1CCC2C1(CCC3C2CC = C4C3(CCC(C4)O)C)C)C(C)C	C₂₉H₅₀O	414.71	0.78	0.55
Ascorbic acid	54670067	C(C(C1C(=C(C(=O)O1)O)O)O)O	C₆H₈O₆	176.12	0.74	0.56
Pinocembrin	68071	C1C(OC2 = CC(=CC(=C2C1 = O)O)O)C3 = CC = CC = C3	C₁₅H₁₂O₄	256.25	0.25	0.55
Kaempferol	5280863	C1 = CC(=CC = C1C2 = C(C(=O)C3 = C(C = C(C = C3O2)O)O)O)O	C₁₅H₁₀O₆	286.24	0.5	0.55

Figure 8.

Venn Diagram and Protein-Protein Interaction Network. Key: number of edges: 95; average node degree: 6.33; avg. Local clustering coefficient: 0.569; expected number of edges: 25 PPI enrichment P-value: <1.0e-16

Table 8.

Top 10 Nephrotic Related Target Genes in Protein-Protein Interaction Network Ranked by Degree Method

Rank	Name	Score
1	ACE	23
2	AGT	21
3	PTGS2	20
4	STAT3	18
5	REN	17
6	SERPINE1	16
7	ESR1	14
8	KDR	13
9	MPO	12
9	PLG	12

Figure 9.

Network Pharmacology of. (A) Potential Phytochemicals Network. (B) Association of Pythochemicals With Top 10 Hub Genes. (C) Top 10 Hub Genes and Kegg Pathway. (D) Top 10 Hub Genes, Phytochemicals and Kegg Pathway Association

GO Enrichment Analysis

Shiny GO 0/77: an online tool was used to perform GO enrichment analysis of 30 common genes. Figure 10 illustrates the top 10 Biological processes, Cellular processes and molecular pathways. For the identification of signal pathways associated with common genes Kegg pathway enrichment analysis of target genes was performed and sorted by Folding enrichment (FDR ≤ 0.05). Figure 11 represents the top 20 signal pathways.

Figure 10.

GO Enrichment Analysis of Target Genes Against Nephrotic Pathways

Figure 11.

Kegg Pathway Analysis of 30 Common Genes Depicts that These Genes are Associated With Various Metabolic and Signal Pathways

Discussion

The current study has been conducted to explore the potential of ethanolic extract of P.roxburghii to treat the problems regarding urinary system. Para coumaric acid, Chlorogenic acid, Gallic acid, kaempherol, sinapic acid, salicyclic acid, and benzoic acid were detected by HPLC analysis. Numerous researches have unequivocally shown that kaempferol has the ability to lower the risk of arteriosclerosis, heart disease, and cancer. Additionally, it is said to have anti-inflammatory, antioxidant properties.²⁴ Chlorogenic acid also have anti-inflammatory and antioxidant potential.²⁵ According to toxicological tests, both acute and subacute, the plant is safe at 1000 mg/kg.Since no death was observed at the end of the experiments, and histological examination further demonstrated that the plant had no negative effects on any organs. Therefore, the plant’s LD50 is greater than 1000 mg/kg. One of the most effective and valuable chemotherapy agents is cisplatin. It is widely used to treat a wide range of cancers, including small cell lung cancer, testicular, bladder, uterine, breast, cervical, stomach, and ovarian cancer. However, due to its propensity for nephrotoxicity, its clinical application is limited.²⁶ Nephrotoxicity is described as the fast deterioration of renal physiology due to perilous results of medicines and chemicals.²⁷ Because toxicities induced by cisplatin are dependent on dose, they are more noticeable when cisplatin overdose occurs, which increases the risk of morbidity and death. Cisplatin may also result in electrolyte imbalances, myelosuppression, peripheral neuropathy, ototoxicity, retinopathy, and hepatotoxicity in addition to nephrotoxicity. There are other reports of convulsions, diarrhea, pancreatitis, and respiratory failure.²⁸ Regarding the nephrotoxic potential, cisplatin builds up in the kidneys during tubular secretion and glomerular filtration. The concentration of cisplatin is roughly 5 times higher than that of blood. Interestingly, the extensive loss of the S3 segment of proximal tubules can allow non-toxic concentrations of cisplatin to approach toxic levels in renal tissue and cause kidney failure. Treatment with cisplatin causes oxidative stress, cytoplasmic organelle breakdown, and DNA damage in renal proximal tubular epithelial cells. The cisplatin primarily affects the endoplasmic reticulum (ER) and mitochondria. The translation process is altered by cisplatin, which leads to a buildup of misfolded proteins in the ER and ER stress advances as a result of it. In the meantime, negatively charged mitochondria amass positively charged cisplatin electrophiles, which reduces the amount of adenosine triphosphate (ATP) that is formed. Reactive oxygen species and free radicals are produced as a result of all of these things. As a result, oxidative stress intensifies. Additionally, the treatment of several antioxidants demonstrated positive nephroprotective efficacy against nephrotoxicity induced by cisplatin. P.roxburghii contains P-coumaric acid, gallic acid, and kaempherol, 3 antioxidant components. This could perhaps be the cause of the plant’s favorable nephroprotective action against nephrotoxicity generated by cisplatin. Since plasma creatinine is a commonly used indicator of renal failure, the cisplatin-treated group’s level was much higher than that of control group, while the co-administration of herbal extract dramatically lowered the creatinine level in the other animals of experimental groups. Additionally, the herbal extract restored the abnormally high serum potassium and salt levels caused by cisplatin. Furthermore, the cisplatin treated group’s histological alterations amply demonstrated the atrophied glomerulus, dilated renal tubules, and enlarged capsular gaps. However, the tissue damage was considerably reversed in the P.roxburghii+cisplatin treated groups. The results indicated that there may be a protective effect for the plant extract against renal tissue impairment. In addition, the experimental groups treated with cisplatin had much heavier kidneys than the control group. This is because cisplatin causes the renal tubules to necrotize.²⁹ Renal mass increased and edema resulted from this necrosis. However, the weight of the treated animals’ kidneys was dramatically decreased when plant extract was given in combination with cisplatin at different doses. The plant has been investigated to determine its diuretic potential since it contains components that are helpful in inducing diuresis. Diuretics are drugs that function within the renal system to encourage the body to lose fluids. Clinical diuretics need to encourage salt loss in order to work. The chemicals achieve this by preventing the reabsorption of ions and water within the renal tubule walls.³⁰ Urine volume and electrolyte concentration were measured in order to conduct a scientific evaluation of the diuretic action of the plant extract. In terms of urinary output, the groups administered plant extract showed a dose-dependent increase in urine volume compared to the control group. However, the groups receiving a large amount of plant extract showed a greater degree of diuresis. Nevertheless, compared to the positive control group receiving furosemide treatment, the diuretic impact was delayed. Standard treatment was furosemide, which began to exhibit diuretic effects within 30 minutes of oral gavage dosing. Different plant extract dosages were found to cause delayed micturition. However, the treated animals eventually produced a sizable amount of urine. Plant extract at low and high doses demonstrated diuretic activities of 0.59 and 0.81, respectively. A diuretic’s activity is deemed to be good if it exceeds 1.50, moderate if it falls between 1.00 and 1.50, mild if it falls between 0.72 and 0.99, and nonexistent if it falls below 0.72.³¹ In summary, a higher dosage of the plant resulted in a slight diuretic effect. The mechanism of diuresis was also ascertained using the Na+/K+ ratio. When the ratio is higher than 1, it means that a plant may have diuretic effect without losing too much K⁺.³² If the ratio is more than ten; it depicts K⁺ sparing diuretic effect. Given that the ratio was more than 1, it is evident that the plant possesses adequate natriuretic effect while maintaining minimal K⁺ loss. Conclusively, the plant lacked potassium sparing diuretic activity.

Plant extract’s ability to inhibit carbonic anhydrase was measured using the Cl^-/[Na⁺ + K⁺] ratio. The inhibitory activity of carbonic anhydrase is excluded by values between 0.8 and 1. But carbonic anhydrase activity can be considered with decreasing ratios.¹⁹ At low and high doses, the plant under study displayed a ratio of 0.38 and 0.39, respectively. It suggests that the plant may have the ability to inhibit carbonic anhydrase activity of renal tubules. The antispasmodic properties of a plant extract were studied using urine bladder strips that were separated. Both high K+ (80 mM) and carbachol (1 µM) caused contractions. At a dosage of 3 mg/mL, plant extract almost totally relaxed the contractions caused by carbachol. Plant extract reduced K+-induced contractions at a 1 mg/mL dosage. The plant extract’s EC50 value of 6.937 mg/mL for carbachol and 1.456 mg/mL for K+ indicated that it had higher calcium channel blocker activity. K+ causes smooth muscle contractions by depolarizing the membrane, which opens voltage-gated calcium channels. This causes the intracellular calcium level to rise and the contraction process to start.³³ Secondary metabolites found in plants are useful in the treatment of a number of illnesses. For instance, flavonoids have cytotoxic, antimicrobial, antiulcer, and spasmolytic effects.³⁴ It is considered that spasmolytic response of plant extract is because of the existence of flavonoids that has been verified by HPLC analysis. Network pharmacological analysis screened 5 potential phytoactive compounds. This analysis showed that 30 common genes were observed to have been associated with nephrotic syndrome after the Venn diagram. Protein-protein network showed the interactive effect of 30 common genes. Cytohubba plugin network analyzer, through the degree method, identified the top proteins (hub genes) interacting closely in the network. The current study endorsed and documented that degree metrics are an indicator of essentiality within the interaction network.²² In the present study, ACE (angiotensin-converting enzyme) protein was observed to have the highest degree score. ACE plays a vital role in the renin-angiotensin-aldosterone system (RAAS).³⁵ RAAS plays an important role in sodium ion homeostasis and regulation of blood pressure. The kidney along with the cardiovascular system works together for the maintenance of these activities.³⁶ Kaempferol reduces the diabetic-induced nephrotoxicity.³⁷ In a recent study, HPLC analysis revealed the presence of Chlorogenic acid, kaempferol, para coumaric acid, salicylic acid, sinapic acid, and gallic acid in the extracts of P. roxburghii. Network pharmacological analysis showed that Kaempferol could possess protective potential against nephrotic syndrome.

Limitation of Study

Further studies are needed to determine that exactly which component of the plant is responsible for nephroprotective and spasmolytic activity. Furthermore, additional analysis and research is needed to determine the precise mechanism of action of the plant regarding its diuretic activity, particularly its potential for natriuresis. It is vital to ascertain the precise component responsible for the natriuretic potential. Moreover, sample size calculation was done on the basis of reported literature and justification was not done because we don’t have the resources and necessary expertise to conduct a thorough sample size calculation. We don’t have enough information to estimate the variability of the outcome measure.

Conclusion

In conclusion, this study shows that the P.roxburghii plant has defensive effects against nephrotoxicity .Moreover, it also possess diuretic and spasmolytic action.

Footnotes

Acknowledgements

We would like to express our sincere thanks and appreciation to Dr Imran, Chairman of the Department of Pharmacology, Bahauddin Zakariya University, Multan for the provision of animals and laboratory equipment required for the conduction of this research.

ORCID iD

Fatima Saqib

Ethical Approval

Ethical approval was attained from the Ethical Committee of Bahauddin Zakariya University, Multan (EC /07-PHL-2022-2024) dated 7th February 2023. Researchers agreed using the approved informed consent documented before their enrolment into the study.

Author Contributions

M.N., F.S., H.S., C.L.C., C.M and M.F.L designed the study and performed experiments.M.N., M.A.M and O.A. collected data and wrote the manuscript. All authors carefully read and approved the final manuscript.

Funding

The authors declared no funding to the research, authorship, and/or publication of this article.

Declaration of Conflicting interests

The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

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Unveiling Nephroprotective,Diuretic and Toxicity Response of Pinus roxburghii Sarg. Extract by In-vitro,In-vivo and Docking Techniques

Abstract

Objective

Method

Result

Conclusion

Keywords

Introduction

Materials and Methods

Plant Extract Preparation

Chemicals

Screening of Phytoconstituents

Screening for Bioactive Compounds Using HPLC

Ethical Statement and Experimental Animals

Inclusion/Exclusion Criteria

Animal and Sample Size Calculation

In-Vitro Experiment on Isolated Tissue

Preparation of urinary bladder strips and experimental set-up

In Vivo Experiments

Sub-acute Toxicity Studies

Acute Toxicity Studies

Protocol of Nephroprotective Effects

Protocol for the Estimation of Diuretic Activity

Histological Examination

Network Pharmacology

Statistical Studies

Results

Pilot Phytochemical Analysis

Analysis of Ethanoic Extract of Pinus roxburghii by HPLC

Findings of Toxicological Research

Acute Toxicity Studies

Influence of Plant Extract on Behavior of Animals

Findings of Histopathology

Findings of Sub-acute Toxicological Research

Impact of Plant Extract on Histopathological Findings and Hematological Parameters

Findings of Nephroprotective Activity

Impact of Plant Extract on Weight of the Body

Impact of P. roxburghii Extract on Renal Weight of Rats

Impact of Plant Extract on Plasma Creatinine

Impact of Plant Extract on Plasma Na+ of Cis-Treated Animals

Influence of Plant Extract on Plasma K+ of Cis-Treated Rats

Histopathological Analysis of Kidneys

Findings of Diuretic Effect

Impact of Plant Extract on Urine Output and Diuretic Action in Animals

Impact on Electrolyte Excretion

Results of in Vitro Studies

Impact on Isolated Urinary Bladder of Rat

Network Pharmacology

GO Enrichment Analysis

Discussion

Limitation of Study

Conclusion

Footnotes

Acknowledgements

ORCID iD

Ethical Approval

Author Contributions

Funding

Declaration of Conflicting interests

References

Influence of Plant Extract on Plasma K⁺ of Cis-Treated Rats