Oral Supplementation of Aqueous Moringa and Ginkgo Leaf Extracts Abates Oxidative Stress and Testicular Injury Associated with Boldenone Injection in Rats

Research Article
Oral Supplementation of Aqueous Moringa and Ginkgo Leaf Extracts Abates Oxidative Stress and Testicular Injury Associated with Boldenone Injection in Rats

Ehab Tousson, Faten Zahran and Mohamed A. Shalapy

Pharmacologia, 2016, 7(8), 381-389.

Abstract

Background and Objective: Because of their muscle-building and growth-enhancing properties, anabolic androgenic hormones are still illegally administered to food-producing animals. Boldenone is an anabolic androgenic synthetic commercial steroid. The present study was designed to investigate the possible effect of Moringa Leaf Extract (MLE) and Ginkgo Leaf Extract (GLE) on the changes in the structure and functions of rat testes after boldenone injections. Materials and Methods: A total of 48 male albino rats weighing 170-200 g and of 10-12 weeks age were divided into 6 groups (8 animals each). First control group includes rats that injected intramuscularly with olive oil. Second and 3rd groups were animals received MLE (intragastrically, 200 mg kg^–1 b.wt.) and GLE (intragastrically, 200 mg kg^–1 b.wt.) respectively. Fourth experimental group include rats that received intramuscular injections of boldenone undecylenate at (5 mg kg^–1 b.wt.) for 12 weeks, 5th and 6th groups where animals intramuscular injected with boldenone and treated with MLE or GLE at the same time respectively. Results: The obtained results indicate that testosterone, testicular MDA and nitric oxide were significantly increased in boldenone group when compared with control group. Also, catalase, super oxide dismutase and total thiol in testicular tissue were significantly decreased in boldenone group when compared with control group. Moreover, increased testosterone levels with biochemical indicators of testicular damage and histopathological and cytokeratin-immunoreactivity alterations supported this conclusion. Conclusion: It has also been shown that the co-treatment with GLE or with MLE provided significant prophylactic treatment from the testicular damage of boldenone.

ASCI-ID: 5001-342

1,2. Anabolic-androgenic steroids caused some adverse effects such as disturbance of the endocrine and immune function, alterations of sebaceous system and skin changes of hemostatic system and urogenital tract^3-5. Anabolic androgenic steroids increase protein synthesis within cells, which results in the buildup of cellular tissue (anabolism), especially in muscles⁶. Boldenone (1,4-androstadiene-17-ol-3-one, BOL) is an anabolic androgenic synthetic commercial steroid, boldenone is derived from testosterone which exhibits strong anabolic and moderately androgenic properties and it has a very long half-life and can show up on a steroid test for up to 1.5 years^4,7-9. Boldenone has dual effects on humans, both directly and indirectly; directly as injection to build muscles and indirectly as through consuming meat of animals that where treated with boldenone^9-11.

Ginkgo biloba (Gymnosperm, Ginkgoaceae) tree is the oldest tree on earth: More than 200 million years old which is called the "living fossil¹²". It is a mixture containing 240 mg g^–1 Ginkgo flavone glycoside (quercetin, kaempferol, isorhamnethin) and 60 mg g^–1 terpene lactones (ginkgolides, bilobalide), those are the most important active ingredients in the extract¹³. Ginkgo Leaf Extract (GLE) from natural sources may reduce the risk of toxicity and preserve the therapeutic effectiveness in clinical trials and in recent years¹⁴. Important proteins with functional properties have been isolated from Ginkgo biloba seeds¹⁵.

Moringa oleifera (Brassicales, Moringaceae) an edible tree found worldwide in the dry tropics which is increasingly being used for nutritional supplementation¹⁶. Moringa has long been recognized in traditional medicine worldwide as having value both as a preventative and treatment agent of several health conditions, including the treatment of inflammation, infectious diseases, cardiovascular, gastrointestinal, haematological and hepatorenal disorders¹⁷. Moringa leaves can be a good source of natural antioxidants¹⁸. The crude extract of phenolic compounds was obtained from Moringa oleifera Lam. The content of total phenolics in the Moringa oleifera extract is 118 mg g^–1. The extract of Moringa oleifera also has strong antiradical activity, phenolic acids (derivatives of caffeic, p-coumaric and ferulic acids) are the dominant phenolic constituents of Moringa oleifera leaves extract¹⁹. Tousson et al.²⁰ and Tousson⁹explain the common phenomena in athletics and bodybuilders who suffer from infertility as they injected with some drugs as steroids (boldenone) to build muscles. Therefore, the aim of the present study was to investigate the possible prophylactic effect of GLE and MLE on the toxicity of the rat testes by boldenone injections.

MATERIALS AND METHODS

Animals: The experiments were performed on 48 male albino rats weighing 180±20 g and of 10-12 week’s age. They were obtained from animal house of National Research Center, Dokki, Giza, Egypt. The rats were kept in the laboratory for one week before the experimental work and maintained on a standard rodent diet (20% casein, 15% corn oil, 55% corn starch, 5% salt mixture and 5% vitaminzed starch, Egyptian Company of Oils and Soap Kafr-Elzayat Egypt) and water available ad libitum. The temperature in the animal room was maintained at 23±2°C with a relative humidity of 55±5%. Light was on a 12:12 h light-dark cycle. The experimental protocol was approved by Local Ethics Committee and Animals Research.

Animal treatments: Animals were divided into 6 groups (8 animals each). First control group includes rats that injected intramuscularly with olive oil for 12 weeks. Second and 3rd groups were animals received MLE (intragastrically, 200 mg kg^–1 b.wt.) and GLE (intragastrically, 200 mg kg^–1 b.wt.) respectively. Fourth experimental group include rats that received intramuscular injections of boldenone undecylenate at (5 mg kg^–1 b.wt.) for 12 weeks, 5th and 6th groups where animals intramuscular injected with boldenone and treated with MLE and GLE at the same time respectively.

At the end of the experiment, the animals were fasted for 10 h and then euthanized with intraperitoneal injection of sodium pentobarbital and subjected to a complete necropsy. Blood samples were individually collected from the inferior vena cava of each rat in non-heparinized glass tubes. Blood serum was separated by centrifugation at 3000 rpm for 15 min. The collected serum was stored at -18°C.

Methods Blood samples: Blood serum was analyzed to determine the concentration of testosterone using commercial kit that was supplied by Diagnostic Systems Laboratories (DSL) from Texas, USA²¹.

Preparation of testicular homogenates: Specimens were separated, weighed and homogenized separately with a 3 Potter Elvenhjem tissue homogenizer. One part was homogenized in phosphate buffer (pH 7.0) for estimation of protein content and CAT enzymes activities levels, the second was 10% w/v testis homogenate in ice-cold saline for estimation of MDA, total thiol, GSH, SOD and NO activity. The crude tissue homogenate was centrifuged at 11,739xg for 15 min in a cold centrifuge and the resultant supernatant was used for different estimations.

Total protein: Total protein content in tissue homogenate was measured according to the method of Lowry et al.²².

Enzymatic and non-enzymatic antioxidant assays MDA assay: Malondialdehyde (MDA), a noxious product of lipid peroxidation was detected by TBARS analysis and measured as reported by Saggu and Kumar²³. The MDA results were expressed as the nmol mg^–1 protein.

Total thiol assay: Total thiol was performed by the method of Sedlak and Lindsay²⁴ that modified by Chattopadhyay²⁵.

Catalase: The catalase (CAT) activity was measured by monitoring H₂O₂ (The substrate of the enzyme) decomposition at 240 nm according to the method described by Aebi²⁶.

Super Oxide Dismutase (SOD): The SOD activity was determination according to the method of Nishikimi et al.²⁷.

Nitric oxide: Nitric Oxide (NO) activity was measured by colorimetric method, kits supplied by bio-diagnostic, Egypt at 540 nm. By colorimetric method, kits supplied by bio-diagnostic²⁸. In acid medium and in the presence of nitrite the formed nitrous acid diazotize suphanilamide and the product are coupled with N-(1-naphthyl)ethylenediamine. The resulting azo dye has a bright reddish-purple color. Nitric oxide is expressed in sample as μmol L^–1.

Histological investigation: Three rats from each group were used for the histopathological and immunohistochemical studies. Testes were immediately removed from the dissected rats and divided transversely into two parts and immediately one part fixed by immersion in 10% buffered formalin solution and left for 24-48 h. The specimens were then dehydrated, cleared and embedded in paraffin. Serial sections of 5 mm thick were cut using mean of rotary microtome and stained with haematoxylin and eosin (H and E) according to the method of Bancroft et al.²⁹.

Immunohistochemical detection of cytokeratin expression: Expression of cytokeratin-immunoreactivity (CK-IR) was detected using Avidin Biotin Complex (ABC) method³⁰. Paraffin sections (5 μm thick) of fixed rat testes that mounted on gelatin chromalum-coated glass slides were dewaxed and rehydrated sections were washed in distilled water for 5 min, rinsed in PBST for 10 min and incubated with 10% normal goat serum for 15 min to reduce non-specific background staining. Then, the sections were incubated with anti-mouse CK monoclonal antibody (DACO Corporation, Carpinteria, CA, USA) diluted up to 1:100 and kept for 12 h at 4°C. The sections after 5 baths in PBST were incubated with biotinylated goat anti mouse immuoglobulin (Nichirei, Tokyo, Japan). The sections after 5 baths in PBST were further incubated with Avidin Biotin Complex (ABC: Nichirei, Tokyo, Japan) for 1 h at room temperature.

The reaction was developed by using 20 mg 3-3’-diaminobenzidine tetrahydrochloride (DAB, Wako pure chemical industries, Ltd.) in 40 mL PBST, pH 7.2 containing 10 mL of hydrogen peroxide (H₂O₂) for 7-9 min at a dark room followed by distilled water then dehydrated and mounted. The criterion for a positive reaction confirming the presence of CK is a dark, brownish, intra cytoplasmic precipitate. For the negative control, the primary antibody was omitted to guard against any false positive results which might develop from a non-specific reaction.

Brightness, contrast were adjusted using Adobe Photoshop software. Image analysis was adjusted using PAX-it image analysis software. The data was statistically analyzed using SPSS statistical version 16 software package (SPSS^® Inc., USA).

Statistical analysis: Data were expressed as Mean+SE and statistical analysis was performed using t-test unpaired to assess the significant differences among the treatment groups. The criterion for statistical significance was set at p<0.05 for the biochemical data. All statistical analyses were performed using SPSS statistical version 16 software package (SPSS Inc., Montreal, Canada).

RESULTS

The animals from practice appeared healthy and did not show any clinical signs of disease. Figure 1 showed the changes in serum testosterone concentration in different group under study. Serum testosterone concentration significantly increases in boldenone rat group when compared with control, MLE and GLE groups. On the other, treatment with MLE or GLE significantly decreases the testosterone levels when compared with boldenone group. Also co-treatment of boldenone with GLE revealed insignificant decrease in testosterone levels when compared with co-treatment of boldenone with MLE.

Table 1 showed that significantly increase in NO and MDA in boldenone group when compared with control, MLE and GLE groups. On the other hand, NO and MDA showed decreased in co-treated MLE or with GLE groups when compared with boldenone group. Catalase, SOD, total thiol and total protein levels in boldenone group showed significantly decrease (p<0.05) when compared with control, MLE and GLE groups. On the other hand, catalase, SOD, total thiol and total protein showed increased levels in co-treated animals with MLE or with GLE groups when compared with boldenone group. Also, Table 1 showed that co-treatment of boldenone with GLE or with MLE revealed good improvement in enzymatic and non-enzymatic antioxidant results and there is no significant difference between their results.

Histological investigation: Histopathological study in control, MLE and GLE groups revealed regular cycle of spermatogenesis (Fig. 2a-c). The structural components of the testis are the seminiferous tubules and interstitial tissues (Leydig cells). Two types of cells are identified in rat seminiferous tubules, the sertoli cells and the spermatogenic cells (spermatogonia, primary spermatocytes, secondary spermatocytes, spermatids and sperms). The sertoli cells, rest on the thin basal lamina (basement membrane) while the spermatogenic cells are arranged in many layers, namely, the spermatogonia, primary and secondary spermatocytes; spermatoids and finally mature spermatozoa (Fig. 2a).

Figure 2d revealed various histopathological changes in the testes sections in boldenone group as disturbance and abnormal distribution of spermatocytes in the lumina of the seminiferous tubules, severe necrosis, severe marked degeneration in most of seminiferous tubules, a significant decrease in the number of sperms with the presence of many syncytial cells, a significant decrease in the numbers of Leydig cells.

On the other hand, testes sections in co-treated boldenone with MLE showed mild improvement with mild normal regular distribution in spermatogenesis cycles, mild atrophy and an increased in the sperm numbers were observed (Fig. 2e). Testes sections in co-treated boldenone with GLE showed moderate improvement with normal regular distribution in spermatogenesis cycles with an increased in the sperm and Leydig cells (Fig. 2f).

Effect of MLE and GLE on testis cytokeratin immunoreactivity: The detection and distribution of cytokeratin-immunoreactivity (CK-IR) in testis sections in the different groups under study were revealed in Fig. 3. Testis sections in control, MLE and GLE groups showed moderate positive reaction for CK-IR (grade 3, 3 and 3 respectively) were detected (Fig. 3a-c) while a mild to negative reactions for CK-IR (grade 1) were detected in the testis sections in boldenone group (Fig. 3d).

On the other hand, moderate positive reaction for CK-IR (grade 3) were detectedin the testes sections in co-treated boldenone with GLE (Fig. 3e).

While a mild positive reaction for CK-IR (grade 2) were detected in the testes sections in co-treated boldenone with MLE (Fig. 3f).

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DISCUSSION

The obtained results indicate that; intramuscular injection of rats with boldenone adversely affects spermatogenesis, suggesting that anabolic-androgenic steroid hormone might play an important role not only in controlling normal testicular development, but also in maintaining normal testicular function and spermatogenesis.

Our results showed agreement with Tousson et al.²⁰ who said that a significant increase in the concentration of plasma testosterone after boldenone injections comparing with the control, serum testosterone levels in treated groups with anabolic-androgenic steroid were significantly higher than that in control group. In contrast, the administration of testosterone alone did not induce any variation in plasma testosterone³¹. Also, Shimomura et al.³² showed that the treatment of rats with ethinyl estradiol alone significantly decreased testosterone levels in serum and the testis.

Our results agreed with Priyadarshani and Varma³³who reported that intramuscular injection of rats with boldenone has marked adverse effect on the testes as well as the effect of GLE and MLE therapy which the testosterone had a significant decreased in control, MLE and GLE groups when compared with its value in boldenone treated group. Also, testosterone in boldenone group showed increased level when compared with co-treated groups with MLE and GLE. Also our results in agreement with Zahran et al.³⁴ who said that there is strong indication that the duration, dosage and chemical structure of the anabolic steroids are important for the serum concentration gonadotropins. A moderate decrease of gonadotropin secretion causes atrophy of the testes, as well as a decrease of sperm cell production¹⁰. Oligo, azoospermia and an increased number of abnormal sperm cells have been reported in athletes using anabolic steroids use, the gonadal functions will restore within some months.

Our results are in agreement with Tousson et al.²⁰ who reported that intramuscular injection in rabbits with boldenone adversely affects spermatogenesis, suggesting that anabolic-androgenic steroid hormones might play an important role not only in controlling normal testicular development.

Spermatozoa, like any other aerobic cell are constantly facing the "oxygen-paradox", the excessive generation of Reactive Oxygen Species (ROS) by abnormal spermatozoa and contaminating leukocytes has been defined as one of the few etiologies for male infertility³⁴. There are two main mechanisms by which Reactive Oxygen Species (ROS) cause infertility. First, ROS damage the sperm membrane, which in turn, reduces sperm motility and their ability to fuse with the oocyte. Second, ROS directly damage sperm DNA, compromising the paternal genomic contribution to the embryo³⁵.

Oxidative stress or oxidative cellular damage with its dual of free radical generation and profound lipid peroxidation are hallmarks of boldenone toxicity².

The obtained results in agreement with Grigorov³⁶ and Ali et al.² who reported that although the human body continuously produces free radicals, it possesses several defense system, which are constitutes of enzymes and radical scavengers such as superoxide dismutase, catalase and glutathione peroxidase while non-enzymatic category contains vitamin C, E, A, β-caretenoids, uric acid and ubiquinone. These are called "first line antioxidant defense system" but are not completely efficient because almost all components of living bodies, tissues and cells undergo free radical destruction.

The GSH is considered to be one of the most very important components of the antioxidant defense of living cells. The reduced tri-peptide GSH is a hydroxyl radical and singlet oxygen scavenger and participates in a wide range of cellular functions³⁷. The current study agreed with Nayak et al.³⁸ who reported that Moringa oleifera L. is a medicinal plant with potential antioxidant property, GSH were significantly decrease in the testicular tissues after boldenone injection when compared with control group, also co-treatment with MLE exhibited anti-oxidant effects not only on the non enzymatic defense system (GSH), but also on the enzymatic one such as catalase.

Our results showed that GLE has been used in activation of the antioxidant enzymes together with the substances that are capable of either reducing reactive oxygen species or preventing their formation form a powerful reducing buffer, thereby form the protective mechanisms, which maintain the lowest possible levels of reactive oxygen species inside the cell. Our results indicate that rats were received intragastrically with GLE have elevated levels of catalase and SOD activity comparing with the rats that were intramuscular injected with boldenone only.

Our results are in agreement with Furman et al.³⁹ who said that GLE can inhibit membrane lipid peroxidation by its antioxidant activity which was observed in the decreasing of MDA in the co-treated groups with MLE and GLE comparing to boldenone group. The present results indicate that decreasing in NO in boldenone group comparing with GLE treated group which come in agreement with Sahoo et al.⁴⁰ who said that GLE has inhibitory effect on nitric oxide.

Co-treatment of boldenone with GLE or with MLE showed moderate or mild (respectively) improvement with normal regular distribution in spermatogenesis cycles with increased in the sperm numbers Leydig cells when compared with boldenone rats group. Also, in the present study indicate that GLE more effective than MLE. So, GLE supplementation enhancement of testicular damage induced by boldenone and will be of major interest to be used as an adjuvant therapy under these conditions. Cytokeratin antibody provides an economical means to evaluate the presence and status of selected keratin proteins. Keratins (cytokeratins) are intermediate filament proteins that are mainly expressed in epithelial cells. Cytokeratin is characterized by remarkable biochemical diversity, represented in human epithelial tissues by at least 20 different polypeptides. Keratins heterodimers composed of an acidic keratin (or type I keratin, keratins 9-23) and a basic keratin (or type II keratin, keratins 1-8) assemble to form filaments^41,42. Our results disagree with Maymon et al.⁴³ and agreed with Franke et al.⁴⁴ and Moll et al.⁴¹ who reported that, the expression of specific cytokeratins appears to depend on the type of tissue as well as on the state of differentiation or development and pathologic conditions.

CONCLUSION

The intensity of CK-IR in boldenone rat testis was significantly decreased when compared with control, MLE and GLE rat groups. Moderate to mild positive reactions for CK-IR were observed in co-treated boldenone with GLE in rat testis sections. Co-treatment of boldenone with MLE or GLE slightly increases when compared with boldenone group.

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