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ORIGINAL ARTICLE
Adv Biomed Res 2016,  5:14

Effect of enalapril in cisplatin-induced nephrotoxicity in rats; gender-related difference


1 Water and Electrolytes Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
2 Water and Electrolytes Research Center; Department of Physiology, Isfahan University of Medical Sciences; IsfahanMN Institute of Basic and Applied Sciences Research, Isfahan, Iran
3 Water and Electrolytes Research Center; Department of Clinical Pathology, Isfahan University of Medical Sciences, Isfahan, Iran

Date of Submission14-Oct-2014
Date of Acceptance17-Jan-2015
Date of Web Publication29-Jan-2016

Correspondence Address:
Mehdi Nematbakhsh
Water and Electrolytes Research Center, Isfahan University of Medical Sciences, Isfahan
Iran
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2277-9175.175253

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  Abstract 

Background: The function of renin angiotensin system (RAS) is gender-related, and this system affects cisplatin (CP)-induced nephrotoxicity. In this study, we compared the effect of enalapril as an angiotensin-converting enzyme (ACE) inhibitor on CP-induced nephrotoxicity between male and female rats.
Materials and Methods: Sixty-two adult male and female Wistar rats were divided into eight groups. Both genders received CP (2.5 mg/kg, i.p.) and enalapril (30 mg/kg, i.p.) for 7 days in compared with CP alone or enalapril alone or vehicle alone treated groups. At the end of the experiment, blood samples were obtained, and the kidney tissue was investigated for histopathological changes.
Results: CP increased the serum levels of blood urea nitrogen and creatinine as well as kidney weight and kidney tissue damage score in both genders (P < 0.05). However, not only enalapril failed to ameliorate the aforementioned parameters in both genders, but also it intensified nephrotoxicity in females (P < 0.05).In addition, enalapril enhanced body weight loss induced by CP in females (P < 0.05). CP alone decreased kidney level of nitrite in both genders (P < 0.05) and enalapril could not reverse this decreasing. The combination of enalapril and CP significantly increased serum level of nitrite in females, but this was not observed in males (P < 0.05).
Conclusion: Enalapril as an ACE inhibitor failed to ameliorate nephrotoxicity induced by CP in both male and female rats. In addition, enalapril aggravated CP-induced nephrotoxicity in female possibly due to gender-dependent RAS response.

Keywords: Cisplatin, enalapril, gender, nephrotoxicity, rat


How to cite this article:
Zamani Z, Nematbakhsh M, Eshraghi-Jazi F, Talebi A, Jilanchi S, Navidi M, Shirdavani S, Ashrafi F. Effect of enalapril in cisplatin-induced nephrotoxicity in rats; gender-related difference. Adv Biomed Res 2016;5:14

How to cite this URL:
Zamani Z, Nematbakhsh M, Eshraghi-Jazi F, Talebi A, Jilanchi S, Navidi M, Shirdavani S, Ashrafi F. Effect of enalapril in cisplatin-induced nephrotoxicity in rats; gender-related difference. Adv Biomed Res [serial online] 2016 [cited 2021 Jan 23];5:14. Available from: https://www.advbiores.net/text.asp?2016/5/1/14/175253


  Introduction Top


Cisplatin (CP), as an antitumor drug, is used to treat solid tumors. [1],[2] However, it is accompanied with side-effects such as nephrotoxicity. [3] Nephrotoxicity is characterized by decrease in glomerular filtration rate and renal blood flow [4] and increase in the serum levels of creatinine (Cr) and blood urea nitrogen (BUN). [5] Recently, the role of gender in acute renal failure induced by nephrotoxins [6],[7],[8],[9],[10],[11] and our previous reports have shown that gender affected CP-induced nephrotoxicity in animals treated by different supplementations such as L-arginine, [12] L-NAME, [13] losartan, [14] erythropoietin, [15] and Vitamin E. [16] In renin angiotensin system (RAS), angiotensin-converting enzyme (ACE) inhibition decreases cardiovascular and renal diseases and prevents the progression of diabetes, [17],[18] and scavenges free radicals and oxidants. [19] The protective effects of captopril as an ACE inhibitor on nephrotoxicity induced by CP is documented; [20],[21] however, the role of gender was not reported yet. Previously, we reported that the effect of angiotensin II receptor blocker; losartan on CP-induced nephrotoxicity was gender-related. [14] Enalapril, as an ACE inhibitor, affects kidney function in renal cystic disease in the animal model. [22] In addition, RAS function is gender-related, [23],[24],[25],[26],[27] and ACE does not equally act in males and females. [28] Accordingly, this study was designed to investigate the role of gender in CP-induced nephrotoxicity in response to enalapril in rats.


  Materials And Methods Top


0Animals

Thirty-one adult female (175.25 ± 3.05 g) and thirty one adult male (224.31 ± 6.38 g) Wistar rats (Animal Center, Isfahan University of Medical Sciences, Isfahan, Iran) were housed at the temperature of 23°C-25°C. The rats had free access to water and rat chow. The experimental procedures were approved by the Isfahan University of Medical Sciences Ethics Committee in advance.

Experimental protocol

The animals were randomly divided into eight groups as follows;

Groups 1 (male, n0 = 6) and 2 (female, n = 6); named as saline that received vehicle for 7 days. Groups 3 (male, n = 7) and 4 (female, n = 7); named as Ena that received enalapril (30 mg/kg/day, i.p.) and saline for 7 days.

Groups 5 (male, n = 9) and 6 (female, n = 9); named as CP that received CP (2.5 mg/kg/day, i.p.) and saline for 7 days.

Groups 7 (male, n = 9) and 8 (female, n = 9); named as CP + Ena that received CP (2.5 mg/kg/day, i.p.) and enalapril (30 mg/kg/day, i.p.) for 7 days. Doses of CP was selected based on previous study. [8],[13]

All animals were weighed daily. At the end of the study, all animals were anesthetized by ketamine (75 mg/kg) and xylazine (10 mg/kg), and blood samples were obtained by heart puncture. Finally, all animals were killed, and the kidneys were removed and immediately weighed. The left kidney was fixed in 10% neutral formalin solution for histopathology procedures, and the right kidney was homogenized for biochemical measurements.

Measurements

The levels of serum Cr and BUN were determined using quantitative diagnostic kits (Pars Azmoon, Iran). The serum and kidney levels of nitrite (stable nitric oxide [NO] metabolite) were measured using a colorimetric assay kit that involves the Griess reaction.

Histopathological procedures

After fixing, the left kidney was embedded in paraffin and prepared for histopathological staining. The slices were stained by hematoxylin and eosin. The kidney tissue damage score (KTDS) was determined by the presence of tubular atrophy, hyaline cast, ischemic necrosis, vacuolization, and debris, and graded from 1 to 4 based on the damage intensity. The zero score was assigned to the normal tissue.

Statistical analysis

Data are expressed as mean ± standard error of the mean. One-way ANOVA followed by LSD was applied to compare the groups with regard to the body weight loss (ΔW) and kidney weight (KW), serum levels of BUN and Cr, kidney and serum levels of nitrite. KTDS was compared using the Mann-Whitney and Kruskal-Wallis tests. P < 0.05 were considered as statistically significant.


  Results Top


CP alone induced body weight loss significantly in both genders ( P < 0.05). Enalapril did not ameliorate body weight loss in male gender while increased body weight loss in the female gender ( P < 0.05). CP increased the serum levels of BUN and Cr, KW, and KTDS in both genders ( P < 0.05) and enalapril not only failed to ameliorate these parameters, but also intensified nephrotoxicity in female gender ( P < 0.05) [Figure 1]. Images of KTDS are provided in [Figure 2]. Kidney level of nitrite was decreased by CP alone in both genders ( P < 0.05) and enalapril could not reverse this trend. The combination of enalapril and CP increased serum level of nitrite in females significantly, but this was not observed in males ( P < 0.05) [Table 1].
Figure 1: Serum levels of blood urea nitrogen and creatinine, kidney tissue damage score, kidney weight g/100 g body weight, and Δbody weight (ΔW) in experimental groups. Abbreviations of Ena, cisplatin (CP), and Ena + CP stand for enalapril, CP, and the combination of enalapril and CP, respectively. The signs stand for significant difference (∗) from Saline and Ena groups; (#) from CP group; ($) from saline group; and (¶) from Ena group; (P < 0.05

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Figure 2: Images of kidney tissue damage score in experimental groups (magnification, ×100). Abbreviations of Ena, cisplatin (CP), and Ena + CP were used instead of enalapril, CP, and the combination of enalapril and CP, respectively

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Table 1: Serum and kidney levels of nitrite


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  Discussion Top


The main objective of this study was to determine the role of gender in CP-induced nephrotoxicity in rats treated with enalapril. CP itself induced nephrotoxicity in both genders, characterized by increasing values of BUN and Cr as well as KTDS and KW. These results were in agreement with the previous reports. [8],[9],[13],[29] CP induces apoptosis, [30] lipid peroxidation, and generation of free radicals. [31] Administration of enalapril had no positive effects on nephrotoxicity induced by CP in males. This is while the protective effects of captopril, as another inhibitor of ACE, on nephrotoxicity induced by CP have been shown. [20],[21] Herlitz et al. found that both captopril and enalapril reduce blood pressure, but only captopril ameliorates proteinuria and hematuria in the animal model of murine systemic lupus erythematosus. [32] Furthermore, it is reported that captopril is more efficient than enalapril in inhibition of spontaneous hypertension. [33] Ohishi et al. stated that captopril can reduce the progression of chronic renal failure in hypertensive rats. This renoprotective effect of captopril is due to the presence of the thiol group rather than its ACE inhibitor property. [34] Moreover, the preventive effect of enalapril against hypertension and nephrotoxicity induced by cyclosporine A in hypertensive male rat has been demonstrated. [35] One study showed that administration of cyclosporine A accompany with enalapril increases urea and creatinine concentrations in uremic rats. [36] In addition, male offsprings treated with chronic administration of enalapril exhibited abnormalities in kidney function and histology. [37] It seems that these different reports probably result from drug interactions and different experimental protocols. In the present study, administration of enalapril aggravated nephrotoxicity induced by CP in the female gender. Previous findings have demonstrated that administration of some supplementations not only did not ameliorate renal toxicity induced by CP in females, but also intensified it. [12],[13],[14],[15],[16] It seems that the different responses observed in female, and male genders are associated with sex hormones. One evidence showed that estrogen alone could progress renal failure induced by CP. [38] In addition, administration of estrogen affects protective effects of some supplementations on nephrotoxicity induced by CP. [39],[40] Moreover, it is documented that RAS acts differently in males and females. [23],[24],[25],[26],[27] Also, ACE activity is lower in women than that in men [28] and administration of estradiol reduces ACE activity in ovariectomized female rats. [41] Therefore, it is thought that opposite effects of enalapril in the genders is due to the gender-dependent RAS response. In the agreement with the previous results, [13],[29],[39],[42],[43] this study demonstrated that CP alone induced body weight loss in both genders probably due to diarrhea and decreased appetite. [44] Also, administration of enalapril elevated body weight loss in female. Consistently, the effect of enalapril on reducing body weight gain, food intake, fat accumulation, and serum leptin concentration in normotensive rats has been demonstrated. [45] The present study showed that administration of CP similarly decreased renal nitrite level in both genders. Such observation was reported in previous studies. [29],[43] NO as a critical agent is produced by three NO synthase (NOS) isoforms; neuronal NOS (nNOS), endothelial NOS (eNOS), and inducible NOS (iNOS). CP up-regulates iNOS and down-regulates eNOS and nNOS. [46] It seems that CP decreases nitrite renal level in both genders via decreasing eNOS. The combination of enalapril and CP increased serum nitrite level in females and also elevated BUN, Cr, and KTDS. It has been shown that enalapril induces apoptosis in neointima by up-regulation of iNOS in the animal model. [47] In this study, CP increased serum level of nitrite in males probably via increasing iNOS. However, it was not significant, and administration of enalapril attenuated this enhancement and enalapril did not intensify renal failure. This observation was in agreement with our previous studies. [11],[48] Finally, observations of this study showed that administration of enalapril aggravates nephrotoxicity induced by CP in the female gender. Moreover, it is documented that women experience adverse drug reactive (ADR) more than men, which is related to several parameters such as therapeutic agent class, type of ADR, and age and physiological condition of women. [49]


  Conclusion Top


It is concluded that enalapril, as an ACE inhibitor, not only failed to ameliorate nephrotoxicity induced by CP in both male and female genders, but also aggravated nephrotoxicity in the female gender.


  Acknowledgment Top


We appreciate Isfahan University of Medical Science for supporting this project.

 
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