|Year : 2017 | Volume
| Issue : 3 | Page : 112-115
Dose and duration dependent cytotoxicity of aroclor 1254 in the testis of mice
Shweta Pathak, Jalpa Raja, Rahul Kundu
UGC-CAS Department of Biosciences, Saurashtra University, Rajkot-360005, Gujarat, India
|Date of Web Publication||26-Sep-2017|
UGC-CAS Department of Biosciences, Saurashtra University, Rajkot-360005, Gujarat
Source of Support: None, Conflict of Interest: None
Objective: To evaluate the dose and duration dependent cytotoxicity of aroclor 1254 on mice testis. Methods: The study tests the hypothesis that in vivo exposure of very low dose aroclor 1254, comparable to that of possible human exposure from different environmental sources, will provoke dose and duration dependent histological damage in the mice testis. Male mice were orally administered with the two doses 0.1 and 1.0 mg/kg b.w /d. of aroclor 1254 for 7, 14, 21 and 28 d. Results: Results showed the degenerative changes in the testis of mice, namely, atrophied seminiferous tubules, expanded space in interstitial and necrosis in the germinal epithelial cells of seminiferous tubules, of the seminiferous tubules and deceleration of spermatogenesis. Conclusions: Therefore, the results of the present study suggested that the sub-acute exposure of very low doses of aroclor 1254, can subsequently mediate the cytoskeleton dysfunction in the testis of mice.
Keywords: PCBs, Aroclor 1254, Histopathology, Testis, Mice
|How to cite this article:|
Pathak S, Raja J, Kundu R. Dose and duration dependent cytotoxicity of aroclor 1254 in the testis of mice. Asian Pac J Reprod 2017;6:112-5
|How to cite this URL:|
Pathak S, Raja J, Kundu R. Dose and duration dependent cytotoxicity of aroclor 1254 in the testis of mice. Asian Pac J Reprod [serial online] 2017 [cited 2022 May 17];6:112-5. Available from: https://www.apjr.net/text.asp?2017/6/3/112/215613
| 1. Introduction|| |
Polychlorinated biphenyls (PCBs) are highly lipophilic and stable compound. Aroclor 1254 commercial mixture of PCBs, which are usually given a four-digit number, of which the first two digits that refer to the number of carbon atoms attached to the biphenyl ring and the last two digits indicate the percentage of chlorine atoms. Polychlorinated biphenyls are well known persistent organic pollutants, that present in the environmental and disrupting endocrine and reproductive functions in wild animals, experimental animals, and as well as in humans reproductive system still occur widely,. PCBs exposure induce the production of reactive oxygen species affects the lipid metabolism, endocrine function including reproductive dysregulation, immune system damage, nervous system disorders, skin disorders such as chloracne, and an array of sensory defects in aquatic organisms at many tropic levels as well as in both humans and wildlife,,,,. In male reproductive dysregulation, it reduce weight of testis and accessory sex organs, decrease the cellular contents in the seminiferous tubules, disturbs the spermatogenesis, reduce the sperm counts in mammals,,. In the human, the levels of PCBs have been inversely correlated to the increased testicular sperm counts that may possibly be associated with Sertoli cell changes. Chronic PCBs exposure has also been associated with the histological alterations which are undoubtedly responsible for the depressed fertility in mice,. Therefore, the present study was to evaluate the low concentration, similar to the environmentally available concentration in the PCB polluted areas, and sub-acute dose and exposure duration dependent cytotoxicity of aroclor 1254 on the mouse testis.
| 2. Materials and methods|| |
A total of 36 healthy 4 mo old male Swiss Albino mice of about 30-40 g body weight were considered for the experimental purposes. The animals were acclimatization for a period of 2-3 d prior to the experiment and grouped before the experiments. The experiments were conducted according to the ethical norms approved by the CPCSEA (R. No. 757/03/a/CPCSEA, 06-05-2003). The toxicant, aroclor 1254 (CAS No. 11097-69-1) was procured from Sigma
Chemical Company Inc., India. For each experiment four groups of animals were used. Each group contained three animals. Each experiment was repeated at least three times. The doses selected were very low concentrations of aroclor 1254, comparable to that of a possible human exposure from different environmental sources. Oral administration of aroclor 1254 different doses (0.1 and 1.0 mg/ kg body weight /d) dissolved in corn oil (vehicle) for four different exposure durations of 7, 14, 21 and 28 d. After exposure of desired doses and duration, the testis were removed, fixed in Bouin’s Fluid, cleaned, dehydrated in graded series of alcohol and embedded in paraffin wax. Ten micrometer thick sections were cut and stained with hematoxylin and eosin (H & E). For observational purpose few slides were considered. Each slide contained two sections and ten field areas of each section were examined for the histopathological changes. The examination was done using Carl Zeiss Axioscop 2 compound microscope fitted with 3CCD color vision camera (DONPISHA XC-003).
| 3. Results|| |
In the present investigation compared to control, significant histopathological changes in the testis exposed to different sub-lethal concentrations of aroclor 1254 were evident. In the control group, normal regular features of the seminiferous tubules, compactly organized germinal epithelium were observed [Figure 1]A & [Figure 2]A. However, histopathological examinations revealed considerable tissue damage in the aroclor 1254 exposed animals. Several types of lesions were observed in the testis exposed to all the doses and exposure durations. After the exposure of 0.1 mg/kg b.w. /d dose of aroclor 1254 for 7 d, marked changes like severe necrosis in seminiferous tubules (SNST) and scattered spermatids (SS) was observed [Figure 1]B. In day 14 exposure duration, more SNST and mild degenerative change in tunica albuginea (MDTA) were observed [Figure 1]C. After 21 d exposure, MDTA and disorganization of germinal epithelium (DGE) were also observed [Figure 1]D. whereas, in the highest exposure duration of 28 d, atrophy in the seminiferous tubules (AST), loss of spermatogenic cells (LSC), DGE and Atrophied seminiferous tubules (ATST) were observed [Figure 1]E. On the other hand, after the exposure of 1 mg/ kg b.w./day of aroclor 1254 for 7 d, marked variation in MDTA and DGE were observed while, in case of 14 d exposure disturbances in the AST and ATST was also evident in some cases [Figure 2]A, [Figure 2]B & [Figure 2]C. However, AST, SS, some vacuoles (V) and MDTA were observed in the testis tissue of the mice exposed for 21 d in the high dose (1 mg/kg b.w. /day) [Figure 2]D. On the other hand, after exposed for the longest duration (28 d) in this dose, the testis tissue showed marked nacrosis with high degree of AST, LSC, SS, MDTA, SNST [Figure 2]E.
|Figure 1: Photomicrographs showing the histopathological alterations in the testis of mice after the exposure of 0.1 mg/kg/day dose of aroclor 1254 for 7, 14, 21 and 28 d as compared control (H & E, 100 ×).|
(A) Control revealed the normal testis with Leydig cells (LC), spermatozoa (SP), seminiferous tubules (ST), lumen (L). (B) After 7 d exposure: Severe necrosis in SNST, SS. (C) After 14 d exposure: MDTA, severe necrosis in SNST. (D) After 21 d exposure: MDTA, disorganization of DGE. (E) After 28 d exposure: AST, LSC, and DGE, ATST.
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|Figure 2: Photomicrographs showing the histopathological alterations in the testis of mice after the exposure of 1 mg/kg/day dose of aroclor 1254 for 7, 14, 21 and 28 d as compared control (H & E, 100 ×).|
(A) Control revealed the normal testis with Leydig cells (LC), spermatozoa (SP), seminiferous tubules (ST), lumen (L). (B) After 7 d exposure: MDTA, DGE. (C) After 14 d exposure: AST, ATST. (D) After 21 d exposure: AST, MDTA, SS, vacuoles (V). (E) After 28 d exposure: Atrophy in the seminiferous tubules (AST), loss of spermatogenic cells (LSC), SS, MDTA, necrosis (N), SNST.
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| 4. Discussion|| |
Exposure of hazardous xenobiotics like PCBs to humans is still a major public health concern. In fact, the exposure of some POPs, like PCBs have the antagonistic, additive, and/or synergistic effects on target organs and tissues may occur. The observed result showed the cyto-architectural changes in seminiferous tubules, necrotic changes in spermatids and spermatozoa present in lumen of seminiferous tubules. Previous studies on mice, rats and rabbits reported the alterations in the testis histology and dysfunction, namely, structural defects in spermatids and sperms, formation of vacuoles in seminiferous tubules, decrease in spermatogenic cells and degeneration of leydig cells in albino mice after the exposure of PCBs and pyrethroids. The exposure to aroclor 1254 showed the irregular seminiferous tubules with spermatogenesis arrest and disorders in the germinal cell shape. In addition, deceleration of spermatogenesis, degeneration of germ cells, thinning of boundary of the seminiferous tubules with multiple breaks at different locations and widening of interstitial spaces between the tubules were also observed. Alston et al. evidenced the degenerative alterations in seminiferous tubules, appearance of pyknotic nuclei, subluminal nuclei as part of spermatozoa heads and lacked tails which is indicating that the exposure of PCBs interfered with spermiogenesis. In fact, an ameliorating effect induced by PCBs and pyrethroids on pathological changes in the rat and testis was reported,,,,. The present study clearly indicated the dose and exposure duration dependent toxic effects of the aroclor 1254 on the histology of the mice testis. However, the alterations in the histology of mice testis were clearly indicative of direct and organ-specific effects of PCB.
Conflict of interest statement
The authors declare that they have no conflict of interest.
| Acknowledgements|| |
Authors are thankful to UGC, Govt. of India, New Delhi for supporting this study through its CAS programme of the Department of Biosciences, Saurashtra University, Rajkot, India.
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