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Regulation of apoptosis by Caspases under oxidative stress conditions in mice testicular cells: in vitro molecular mechanism

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Abstract

Exposure to various toxicants is known to cause apoptosis in various cell types. The spermatogenic cells are particularly sensitive to various deleterious conditions including toxicant exposure. The affected cells might undergo apoptosis; however, the mechanisms may be different for different kinds of insults to the cells. In the present study, we looked into the mechanisms involved in apoptosis after exposure of testicular cells from mice to two different chemicals, diethyl maleate (DEM) and tert-butyl hydroperoxide (TBHP). For the study, cells were maintained for 4 h under various treatments: control (media only), 0.25 mM DEM, 0.5 mM DEM, 0.25 mM TBHP, and 0.5 mM TBHP. The treated cells were then harvested for various estimations, viz. viability, reduced and oxidized glutathione, redox ratio, free radical generation, and ethidium bromide/acridine orange co-staining. mRNA was extracted for RT-PCR analysis of Caspase 3, Caspase 8, Caspase 9, p53, p21, Bax, and Bcl-2. It was observed that both the treatments resulted in decreased levels of reduced glutathione and a concomitant increase in the oxidized form and ROS levels in a dose-dependent manner. The apoptotic cell death was evident from ethidium bromide/acridine orange staining. The mRNA expression pattern of various Caspases showed progressive increase in Caspase 3 and Caspase 9 mRNA in both the treatments in a dose-dependent manner, whereas there was no change in Caspase 8 mRNA expression. p53, p21, and Bax also showed increased expression, whereas Bcl-2 expression remained unchanged in DEM treatments and increased significantly in both TBHP treatments. Hence, the present study indicates the involvement and activation of various apoptotic factors, particularly Caspase 3 and 9 along with p53, in response to exposure of testicular cells to DEM and TBHP.

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Acknowledgments

The financial support provided by Council of Scientific and Industrial Research, Government of India, New Delhi, is highly acknowledged.

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  1. Department of Biophysics, Panjab University, Chandigarh, 160014, India

    Sumiti Kalia & M. P. Bansal

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Correspondence to M. P. Bansal.

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Kalia, S., Bansal, M.P. Regulation of apoptosis by Caspases under oxidative stress conditions in mice testicular cells: in vitro molecular mechanism. Mol Cell Biochem 322, 43–52 (2009). https://doi.org/10.1007/s11010-008-9938-7

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