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ORIGINAL ARTICLE
Year : 2011  |  Volume : 3  |  Issue : 4  |  Page : 260-265  

Effects of the oral administration of nonpolar extract from Ardisia squamulosa Presl (Myrsinaceae) leaves on spermatogenesis in rats


1 Biology Department, School of Science and Engineering, Ateneo de Manila University, Loyola Heights Quezon City 1101; Institute of Biology, College of Science, University of the Philippines, Diliman Quezon City 1101, Philippines
2 Institute of Biology, College of Science, University of the Philippines, Diliman Quezon City 1101, Philippines

Date of Submission20-Apr-2011
Date of Decision14-May-2011
Date of Web Publication15-Nov-2011

Correspondence Address:
Dennis D Raga
Biology Department, School of Science and Engineering, Ateneo de Manila University, Loyola Heights Quezon City 1101
Philippines
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0974-8490.89747

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   Abstract 

Background: Several Ardisia species have been found to possess numerous bioactivities but their reproductive toxicity has been poorly explored. In the present study, the effects of the leaf hexane extract of Philippine indigenous Ardisia squamulosa on epididymal sperm count, %viability and %aberration of sperms and weights of seminal vesicle, cauda epididymis, and testes in addition to the weights of liver, kidney, and body were evaluated. Methods: The extracts at daily dose levels of 1, 10, and 100 mg/Kg BW in 10% polysorbate-80 in corn oil were administered by gavage for 8 successive days to 8-10 weeks old male SD rats and sacrificed after 9 days. Daily body weights and final organ weights were measured. Sperm from the cauda epididymis was extracted and measured according standard sperm parameters (sperm count, morphology, viability and membrane integrity). Results: Significant findings were the decline of left epididymal sperm count to testis weight ratio and increase in %sperm morphological aberration from both cauda epididymis obtained with the 10 mg/Kg BW dose. Conclusion: The hexane extract from Ardisia squamulosa had significant effect on sperm count but with negligible effect on sperm morphology and viability.

Keywords: Myrsinaceae, spermatogenesis, sperm count, sperm morphology


How to cite this article:
Raga DD, Pocsidio GN, Herrera AA. Effects of the oral administration of nonpolar extract from Ardisia squamulosa Presl (Myrsinaceae) leaves on spermatogenesis in rats. Phcog Res 2011;3:260-5

How to cite this URL:
Raga DD, Pocsidio GN, Herrera AA. Effects of the oral administration of nonpolar extract from Ardisia squamulosa Presl (Myrsinaceae) leaves on spermatogenesis in rats. Phcog Res [serial online] 2011 [cited 2020 Sep 20];3:260-5. Available from: http://www.phcogres.com/text.asp?2011/3/4/260/89747


   Introduction Top


The genus Ardisia Swartz belongs to the family Myrsinaceae. Ardisia has 68 recorded species in the Philippines, [1] 60 of which are endemic. These are primarily distributed in Mindoro, Polilio, Samar, Panay, Mindanao, Palawan, Leyte, Biliran, Nueva Ecija, Laguna, Bicol, Ilocos Sur, Ilocos Norte, Sambali, Negros Occidental, Negros Oriental, Cebu, Agusan, Pampanga, Batangas, Cagayan, and some other areas in Luzon. It is commonly known as Tagpo. It is identified, however, into several vernacular names, such as Tagpong pugot (A. brevipetiolata Merr.), Puyakang mangyan (A. calavitensis Merr.), Tagpong lumotan (A. geissanthoides Mez.), Dapui (A. saligna Mez.), Panabon (A. serrata Pers.), Sagoi (A. verrucosa Presl.), Katipu (A. warburgiana Mez.), Tagpo (A. whitfordii Mez., and Ardisia squamulosa Presl.), Aunasin (Ardisia pyramidalis Pers.). [2] Ardisia leaves are eaten as vegetable, used as greens for salad, or cooked with meat or fish. [2] The flowers and fruits may be cooked and used as flavoring for fish. Young leaves are also eaten by ruminants, while the fruits are eaten by monkeys and wild pigs and birds. [2] A. pyramidalis fruit approximate analysis (Catibog, 1978) revealed high fiber content (37.99%), crude protein (13.50%), crude fat (0.41%), and some minerals, such as Ca (0.96%), P (0.21%), K (1.90%), and N (2.16%). Chemical analysis on the Dichloromethane (DCM) extract of leaves afforded spinasterul acetate, spinasterol, α-amyrin, β-amyrin, bauerenol, squalene, and lutein. [3]

The genus Ardisia is a good source of health promoting compounds and potent phytopharmaceuticals. [4] Recent studies revealed high anticancer properties in a number of Ardisia species tested. Gonzales De Mejia et al. reported that the polyphenolic compounds and flavonoids present in A. compressa tea were cytotoxic on human colorectal carcinoma (HT-29 and Caco-2. LC-MS) by catalytic inhibition of DNA topoisomerase. [5] The aqueous extracts (tea) of A. compressa leaves was found to be cytotoxic on HepG2 cells by the inhibition of topoisomerase II acting as catalytic inhibitors, [6] in vitro antioxidant defense against 1-nitropyrene and benomyl-induced cytotoxicity in rat hepatocytes, [7],[8] anticarcinogenesis in the liver. [6] In addition, A. compressa also has hepatoprotective property. [7] Ardisia arboresence was found to have antipyretic properties, [9] while A. colorata have been found to be hepatoprotective, mucolytic, and antidiarrheal. [10] A number of biological activities have been reported for Ardisia crenata where it was found to induce uterine contraction, [11] platelet aggregation, and induce blood pressure lowering, [12] cAMP inbhibition (Jia et al., 1994), [13] and antithrombin activity. [14] The methylene chloride:methanol extracts from the leaves of A. crenata was found to have antithrombin activity. [14] Horgen et al., reported the presence of a novel compound ardisenone isolated from twigs and leaves of A. iwahigensis. Furthermore, Ardisenone was found to have significant cytotoxic activity in murine cells and later identified to have anticancer property as well. Spinasterol, a mixture of α-amyrin, β-amyrin, and bauerenol and triglycerides from A. pyramidalis have been found to have positive vascular damage in duck chorioallantoic membrane. [3] Ardisia squamulosa (Myrsinaceae) and was found to be anti-HSV and anti-ADV but was most effective in inhibiting ADV-8 replication. [15]

The leaves of A. squamulosa is commonly consumed as tea preparations as a traditional medicinal plant in Taiwan. [13] Despite the numerous bioactivities of this genus, there have been no reports on the reproductive toxicity, anti-androgenic and antispermatogenic potentials of Philippine endemic Ardisia species particularly A. squamulosa. The main purpose of this study is to elucidate on the male reproductive toxicity assessment of the nonpolar extract from A. squamulosa.


   Materials and Methods Top


Plant material and preparation of nonpolar extract

A. squamulosa leaves from Kanawan, Bataan, was collected in April, 2008, and identified at the Jose Vera Santos Herbarium Collection of the Institute of Biology, College of Science, University of the Philippines Diliman, Quezon City. The air-dried leaves (800 g) were pulverized and soaked in 2 L n-hexane (Ajax FineChem, Taren Point, NSW, Australia) for 3 days, then filtered. The nonpolar extract was obtained to specifically investigate on the nonpolar constituents that might have solubilized in a solution in traditional preparations. The filtrate was then concentrated under vacuum to afford 10.38 g of nonpolar extract. The extract was further liberated from the extracting solvent by desiccation. Ten percent polysorbate 80 (10% P80, Ajax FineChem, Taren Point, NSW, Australia) in corn oil was used as vehicle and kept in cold storage until time of use.

Animals

A total of 24 male (8-10 weeks old) laboratory-bred Sprague-Dawley rats (Rattus norvegicus) weighing an average of 166.56±20.74 g at the beginning of the study from parent stocks obtained from the Experimental Animal House of the Bureau of Food and Drugs, Muntinlupa City, Philippines, were used in the study. The animals were acclimatized for 14 days under normal conditions with 12 h daylight and 12 h darkness, with free access to food pellets (28% Crude Protein, 14% Crude Fat) and water.

Doses and treatments

The animals were randomized into 4 groups (n = 6). Control (27 ml/kg BW 10% P80) and the 3 different doses of the extract (1, 10, and 100 mg/kg BW) were administered orally for 8 days. All procedures regarding handling of the test animals were in accordance with the existing guidelines of the Philippine Association of Laboratory Animal Science [16] for care and use of laboratory animals and with Administrative Order 40 of the Bureau of Animal Industry relative to Republic Act No. 8485.

Testes to body weight ratio

The rats were weighed individually everyday and before the test animals were sacrificed. The rats were dissected under light ether anesthesia to excise the testes from the animals. Testes were cleaned of superficial fatty layer, weighed, and then transferred into 10% formalin solution. The testes-body weight ratio was determined according to the equation given by Yakubu et al. Organ:BW ratio = weight of testes/weight of the animal. [17]

Sperm number, morphology, viability, and membrane integrity

The cauda epididymis was dissected and homogenated in 1 mL cold Phosphate Buffer Glucose Saline (PBGS: NaCl, 50 mM/L; Na 2 HPO 4 , 200 mM/L; glucose, 20 mM/L; KH 2 PO 4 , 26 mM/L) and stored at 4°C for 24 h to allow sperm to be released from the walls. Sperm number was estimated using Neubauer hemocytometer by counting the number of cells in the five 1 mm squares in 10 1 dilution (10 μL sperm suspension in 1 mL PBGS) and computed as concentration/mL = dilution factor × count in 5 squares × 0.05 × 10 6 . Sperm viability and morphology was evaluated according to the procedure of Bjorndahl et al. by staining 15 μL of epididymal sperm suspension with eosin counter stained with nigrosin spread on a microscope slide. [18] The percentages of alive (white) and dead (red) cells were calculated by at least counting 200 cells. Sperms with intact membrane do not undergo staining, which shows the integrity of cell membrane. [19]

Statistics

The results were analyzed by one-way analysis of variance using SPSS version 13 for Windows. Significant differences within group variables were determined by Tukey's multiple comparison test. Results were considered significant at 5% level of probability (P < 0.05). The data were presented as mean ± SD at 0.05 level of significance.


   Results Top


General observations

The test animals did not exhibit any sign of toxicity, such as weight loss, poor grooming, depression, slow reflex response, and other behavioral manifestations described by Guevarra et al. The animals did not reveal any sign of intoxication as well. The rats did not reveal observable signs of central nervous system (CNS) depression and zero mortality. There was also a significant increase in the average daily body weights [Figure 1], indicating that the test animals were in good condition at the start and at the end of the study. This indicates that the dosages administered were below toxic level. In addition, none of the animals died from the time of acclimatization until the end of the experiment.
Figure 1: Body weight gain of male SD rats administered with (a) corn oil, (b) 1 mg/kg BW/d, (c) 10 mg/kg BW/d, and (d) 100 mg/kg BW/d A. squamulosa extract for 7 days.

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Analysis of the liver to body weight ratio reveals that there was no significant difference (P = 0.702) between the control and the experimental groups. The same is true for both right (P = 0.345) and left (P = 0.594) kidney to body weight ratios [Table 1]. This further indicates that A. squamulosa is not toxic at the dose levels tested. Histological analysis however was not performed.
Table 1: Liver and kidney to body weight ratio


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After daily oral dose administrations of A. squamulosa nonpolar extract, the rats given an oral dose of 10 and 100 mg/kg BW/day obtained slightly lower seminal vesicle to BW ratios as compared to the 1 mg dose and control. The ratios however revealed no significant differences (P = 0.058) with that of the control. The right (P = 0.503) and the left testes (P = 0.538) also revealed no significant differences with that of the control. The right (P = 0.068) and left (P = 0.081) cauda epididymis of the experimental group revealed slightly lower ratios but the differences were too little to attain statistical significance [Table 2]. A net increase in the ratio may indicate increased activity of the reproductive organ relative to spermatogenesis. It is evident that the reduction of organ to BW ratio compared to the control was not totally different at all which indicates that the organ was not affected by oral administration of the extract.
Table 2: Reproductive organ to body weight ratio


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Sperm count in the left cauda epididymis indicates that the number of sperm was significantly affected (P = 0.02) by the nonpolar extract. The right cauda epididymis, however, was not affected by the oral administration of the extract (P = 0.058). [Table 3] presents the sperm count in the left and right cauda epididymis, %viability, and %aberration. Rats administered with the lowest dose in both right (41.50 × 10 6 ± 5.82 cells/mL) and left (49.58 × 10 6 ± 6.01 cells/mL) epididymis obtained a slightly higher mean compared to the control (right: 35.75 × 10 6 ± 7.34 cells/mL, left: 43.67 × 10 6 ± 5.33 cells/mL) but such difference was not enough to obtain significant statistical difference. Those treated with the median dose obtained the lowest sperm count (27.42 × 10 6 ± 7.14 cells/mL and 20.83 × 10 6 ± 7.1 cells/mL, right and left, respectively), which is significantly different (P = 0.062) with that of the control but may or may not be different with that of the highest dose (33.25 × 10 6 ± 7.42 cells/mL, 33.42 × 10 6 ±7.09 cells/mL, right and left, respectively). Analysis of sperm production compared to testes weight is concomitant with the sperm count data in the right sperm count versus testes weight, which was not affected by the nonpolar extract (P = 0.0716) but the sperm count in the left epididymis, however, was significantly affected (P = 0.02). The control (32.30 ± 3.94) and the lowest (32.62±3.8) dose are not significantly different while the median (14.05 ± 5.09) and the highest (23.43±4.76) dose may have overlapping similarities. Although statistical results indicate that sperm production may have been partially inhibited by the increase in dosage of the extract [Table 3], an unclear dose response is still evident between 10 and 100 mg/kg BW, which may be due to the crude nature of the compound.
Table 3: Sperm production profile


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Eosin and nigrosin cell viability staining reveals that there is no significant (P > 0.05) difference between the number of living and dead cells at the time of eosin infiltration with 100% living cells observed in 200 cells counted. The occurrence of specific aberrations such as curled distal part of the flagella were noted and found to have significantly (P = 0.001) different with the control. There were no observable signs of aberration at the lowest dose (0.0% ± 0.0%) in both right and left cauda epididymis. The median dose, however, revealed 1.25% ± 0.11% aberration in the right and 1.67% ± 0.11% in the left cauda epididymis, while 0.92% ± 0.38% was observed at the right cauda epididymis. The observed values, however, are below the normal threshold level for abnormal sperm, which is 30% [Table 4].
Table 4: Sperm quality assessment


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   Discussion Top


The oral treatment of A. squamulosa nonpolar extract reveals no observable signs of toxicity on male rats. This was particularly based on the net change in daily body weights along with liver, kidney and reproductive organ weights. A significant decline in organ and body weights correlates to the impairment of reproductive functions. [20] The current study reports that the nonpolar extract from A. squamulosa, there was a regular increase in daily body weights in all of the test organisms for a total of 8 treatment days. The extract did not show any toxic effects that may have been observable in the rat behavioral activity for 24 h or during the treatment periods. There was neither sign of CNS toxicity nor any signs of depression. Rats from the median and highest dose, however, revealed signs of diarrhea at the beginning of treatment but eventually recovered during the succeeding days. The same was observed in one of our preliminary experiments on the assessment of reproductive and developmental toxicity in female mice (data not shown). The ratio of reproductive organ weight to body weight remained similar with the control.

There was a slight reduction of sperm number in the median and the highest dose but such are enough to attain statistical significance. The unclear dose response, however, between 10 and 100 mg/kg BW of the crude sample was most probably due to the crude nature of the extract limiting the relative solubility of the substance. The extract on the other hand may contain possible antispermatogenic compounds similar to what was reported by Calle et al. when he isolated rapanone and tested it on male mice. Rapanone and embelin are major compounds in the genus Ardisia. Embelin is particularly found in A. crenata and A. japonica, [21],[22] whereas rapanone is present in A. macrocarpa, [23] A. crenata, [21] and A. japonica.[21] Rapanone and embelin have similar antifertility and abortive effects on mice. [24] Similarly, Gupta and colleagues (1989) reported embelin to be antispermatogenic in rats. [25] Embelin also had little effect on normal prostate epithelial cells while inhibition of cell growth was reported along with apoptosis and activation of caspase-a in human prostate cancer cells. [26] This may partly explain why there was slight decline in organ weights of those rats given 10 and 100 mg/kg BW/day. The anticancer properties of the genus Ardisia may be one of the reasons for the decline of spermatogenic activity in the median and high dose treatments. Ardisia crispa[27] and A. japonica[26] have been reported to have antimetastatic and antitumor activities. Ardisin is a major component found in A. compressa (Ramirez-Mares and Gonzalez de Mejia, 2003) [5] and A. japonica[23] (Liang et al, 1979 In Kobayashi et al) Horgen et al. reported the presence of a novel compound ardisenone isolated from twigs and leaves of A. iwahigensis. [28] Furthermore, ardisenone was found to have significant cytotoxic activity in murine cells and later was identified to have anticancer property as well.


   Conclusions Top


The current study presents that the nonpolar extract from A. squamulosa has no toxic effects on rats administered orally. This was particularly based on the observation of the daily body weight increase and liver and kidney weights to body weight ratio which are not significantly different with the control. Although there was a slight decline in the reproductive organ weight to body weight ratio, reproductive organs in general were unaffected by oral administration of the nonpolar extract. These findings are complimented by 100% viability of cells assayed for membrane integrity. Aberration was affected by 10 and 100 mg/kg BW but is still far below the normal threshold for the level of abnormal sperm morphology. There was an obvious decline in the spermatogenic activity, which may be accounted for the antitumor properties of rapanone and embelin, which are major constituents of the genus Ardisia. Further tests, however, should be conducted to confirm the specific effects on spermatogenesis. It is suggested that histological analysis be conducted to determine the effects of the extract on A and B spermatogonia, epithelialization of spermatogonial cells, and lumen diameter. A. squamulosa extracts obtained from solvents of higher polarity, such as dichloromethane and methanol may be tested as well to determine the probable activities of other compounds that are relatively insoluble in n-hexane.

 
   References Top

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18.Bjorndahl, L., Soderlund, I., Johansson, S., Mohammad, M., Pourian, M. & Kvist, U. 2004. Why the WHO recommendations for eosin-nigrosin staining techniques for human sperm viability assessment must change. Journal of Andrology, 671-677.  Back to cited text no. 18
    
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24.Calle J, Olarte J, Pinzon R, Ospina LF, Mendoza MP, Orozco MJ. Alteration in the reproduction of mice induced by rapanone. J Ethnopharmacol 2000;71:521-5.  Back to cited text no. 24
    
25.Gupta S, Sanyal SN, Kanwar U. Antispermatogenic effect of embelin: A plant benzoquinone, on male albiono rats in vivo and in vitro. Contraception 1989;39:307-20.  Back to cited text no. 25
    
26.Nikolovska-Coleska Z, Xu L, Hu Z, Tomita Y, Li P, Roller PP, Discovery of embelin as a cell-permeable, small molecular weight inhibitor of XIAP through structure-based computational screening of traditional herbal medicine three-dimentional structure database. J Med Chem 2004;47:2430-40.  Back to cited text no. 26
    
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28.Horgen FD, Guinaudeau H, Pezzuto JM, Soejarto DD, Farnsworth NR, Agcaoili F, et al. Isolation and structure elucidation of ardisenone: A new cytotoxic alkenylphenol from Ardisia iwahigensis. J Nat Prod 1997;60:533-5.  Back to cited text no. 28
    


    Figures

  [Figure 1]
 
 
    Tables

  [Table 1], [Table 2], [Table 3], [Table 4]


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