Cistanche Deserticola Decoction Alleviates The Testicular Toxicity Induced By Hydroxyurea in Male Mice

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Li Gu, Wen-Ting Xiong, Chao Wang, Hong-Xia Sun, Guo-Fu Li, and Xin Liu

This study aimed to evaluate testicular toxicity induced by hydroxyurea (HU) and the possible counteracting effect of an aqueous extract of Cistanche deserticola (CD). HU is an antineoplastic drug that has potential reproductive toxicity, and Herba Cistanche has been used as a tonic for the reproductive system for thousands of years. Sixty mice were randomly divided into five groups. Except for mice in the normal group, the rest received HU (400 mg kg21 body weight) intragastrically. Meanwhile, mice in normal and HU control groups received purified water, and the rest received intragastrically three doses of CD decoctions (1.5, 3.0, and 6.0 g crude drug kg21 body weight, respectively) daily for 4 weeks. Severe testes lesions were observed, testes weight (P,0.01) and serum luteinizing hormone levels (P,0.01) were also decreased significantly, in the HU groups. Three doses of CD decoctions alleviated the spermatogenetic cell degeneration induced by HU and modulated the serum sex hormones levels to some extent.

Asian Journal of Andrology (2013) 15, 838–840; doi:10.1038/aja.2013.73; published online 1 July 2013

Keywords: Cistanche deserticola; hormones; hydroxyurea; seminiferous tubule

Cistanche tubulosa

INTRODUCTION

Hydroxyurea (HU) is an antineoplastic drug that has cytotoxic effects on the rapidly proliferating S phase of the cell cycle. However, at a dosage of more than 200 mg kg21, HU results in testicular failure, reduced sperm quality, and altered plasma hormone levels.1 The most sensitive indicators for detecting male reproductive toxicity are testicular weight and histopathological findings in the testes. The primary functions of testes are spermatogenesis and producing androgens, primarily testosterone,2 which is regulated by follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in the hypothalamus-pituitary–gonad axis.3 HU has been shown to suppress spermatogenesis and repress testosterone synthesis and release,1 of which is likely responsible for male infertility. However, little attention has been focused on finding medications to alleviate testicular toxicity induced by HU.

Herba Cistanche, the stem of the Cistanche species, has been involved in herbal medicine as a tonic for thousands of years in some Asian countries. Among Cistanche species, Cistanche deserticola Y. C. MA (CD) has been indicated as the primary source material to tonify the kidney and invigorate the ‘Yang’ in traditional Chinese medicine theory,4 which is allegedly effective for reproduction, development, and fertility function. Considering the benefits of CD on the reproductive system, in the present study, the potential effects of CD supplementation against testicular toxicity induced by HU should be investigated.

MATERIALS AND METHODS

HU was purchased from Qiu Pharmaceutical Co., Ltd (Ji’nan, China). The dried stems of CD were purchased from Shenzhen GURU Biology Co., Ltd (Shenzhen, China). CD samples were pre-pared as aqueous decoctions, and sixty male Kunming mice were randomized into five groups. Mice in the normal group were administered purified water intragastrically for 4 weeks daily, while the other mice received HU (400 mg kg21). Meanwhile, the CD-treated groups were administered intragastrically with 1.5 g kg21 (low dose of CD decoction group, LCD1HU), 3.0 g kg21 (median dose of CD decoction group, MCD1HU), and 6.0 g kg21 (high dose of CD decoction group, HCD1HU) CD decoctions, respectively, while the normal and HU groups were administered water only. At the end of treatment, the testes were weighed, and a routine histological assessment was performed. Blood samples were obtained, and total serum hormones (testosterone, LH, and FSH) concentrations were measured using commercial radioimmunoassay kits (Beijing North Institute of Biological Technology, Beijing, China).

Cistanche can boost testosterone

RESULTS

The histological evaluation of testes from normal mice revealed a normal seminiferous epithelium with typical cell stages. The morpho- logy of the spermatogonia, spermatocytes, round spermatids, and sperms appeared normal (Figure 1a). However, severe lumen cavitation of the seminiferous tubule in the testes was observed in the HU group, with nearly all types of spermatogenetic cells degenerated. In some instances, the tubules were virtually empty, and some were collapsed (Figure 1b). However, when treated with CD decoctions, some spermatogonia and early spermatocytes (arrows) were observed in the seminiferous epithelium (Figure 1c–1e), although lumen cavitation of the seminiferous tubule was also exhibited in the testes. No apparent differences were found between the three CD-treated groups.

At the end of the 4-week experiments, the mean testes weight in the HU group was significantly less than that of the normal group (P,0.01). In contrast with the HU controls, the testis's weights increased approximately 25% in the LCD1HU group, 23% in the MCD1HU group, and 28% in the HCD1HU group. Furthermore, the average testosterone concentration in the HU mice was approximately 27% lower than their normal counterparts. However, the testosterone concentration tended to be increased by approximately 25% and 22% in the HCD1HU and MCD1HU groups, respectively, compared with the HU control. In addition, the mean serum LH levels in HU mice were reduced by 65% (P,0.01) compared with the normal control. However, CD decoctions increased serum LH levels by approximately 28% in the HCD1HU group, 26% in the MCD1HU group, and 30% in the LCD1HU group. No significant differences were observed between the groups regarding FSH concentrations (Table 1).

DISCUSSION

Our results demonstrated that excess HU resulted in serious testicular lesions and decreased serum testosterone and LH levels. However, CD decoctions counteracted the hazardous effects of HU on the seminiferous tubules of the testes and modulated hormones levels to some extent.

One of the primary functions of the testes is sperm production. Several retrospective studies reported abnormal sperm parameters during and after treatment with HU.5 Spermatogenesis depends on the normal number and morphology of spermatogonia, spermatocytes, and round spermatids. HU induces testicular germ cell apoptosis in a time- and stage-specific pattern, followed successively by spermatogonia, spermatocyte, and spermatid because spermatogonia are sensitive to chemotherapeutic drugs.6 When administered with HU continuously, no interactions between spermatogenetic cells and Sertoli cells were observed, and the sperm, round spermatids, spermatocytes, and spermatogonia came off successively in addition to the testicular defect; thus, the atrophied seminiferous tubules, which contained large vacuoles and few cells, had considerably smaller diameters compared with the normal tubules in HU-administered mice.

We also observed that the seminiferous tubules were virtually empty and that the testicular weights were decreased under HU administration. However, CD remitted the testes shrink by 20%–70% compared with the HU controls, with some spermatogenetic cells still present in the seminiferous epithelium. The inhibition of DNA synthesis is involved in mediating the toxicity of HU,7 which is related to an involution of spermatogenetic cells. Interestingly, Liu et al.8 found that the DNA synthesis of the liver and spleen of mice damaged by HU was recovered by CD decoction. The resumption of spermatogenesis was thus probably due to the recovery of DNA synthesis in testes by CD.

In males, androgen plays a key role in the development of male reproductive tissues.9 We found that CD decoction tended to increase serum testosterone content, likely due to its androgen-like effect.10–12 However, supraphysiological doses of testosterone and its derivatives are known to suppress spermatogenesis.13 Toxicology research has shown that the serum testosterone levels decreased to approximately 5.0–10.0 g crude drug kg21 bodyweight of CD decoction in normal mice.14 It is possible that the suppression effect of CD as an erectogenic androgen-like agent made the dose-dependent effect of the three doses of CD decoctions against testicular injury more difficult to detect. Therefore, dosages should be kept within safe limits.

In males, testosterone is synthesized and secreted by Leydig cells of the testes and is regulated by LH and FSH.15 The regulation of testosterone synthesis appears to be the only indispensable function of LH within the adult testes,3,15 and the feedback control of testosterone by LH are consistent. However, the feedback control of testosterone by FSH is relatively complex.16 In the current study, HU affected the LH endocrine function more than FSH function in male mice, while the effects of CD on LH and FSH levels were not easily detected.

In conclusion, HU caused testicular lesions at a dosage of 400 mg kg21. CD decoctions alleviated the spermatogenetic cell

degeneration induced by HU; this effect is related to its ectogenous androgen-like effect. However, our report opens the debate on whether CD is beneficial for sperm beyond one sperm cycle through the recovery of DNA synthesis in testes cells.

AUTHOR CONTRIBUTIONS

LG and XL conceived the study and participated in its design. WTX and CW performed animal experiments and histological assessments. LG and HXS participated in the hormone assessment. LG drafted the manuscript. GFL performed the statistical analysis and helped revise the manuscript. All authors read and approved the final manuscript.

COMPETING FINANCIAL INTERESTS

The authors have no competing financial interests.

ACKNOWLEDGMENTS

This work was supported by a grant from the Science and Technology Support Project in the Nanshan Region of Shenzhen (China) (No.2009058).

REFERENCE

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