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ToxSci Advance Access published online on February 16, 2009
Toxicological Sciences, doi:10.1093/toxsci/kfp027
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© The Author 2009. Published by Oxford University Press on behalf of the Society of Toxicology. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Pro-apoptotic effects of lindane on mouse primordial germ cells

La Sala Gina, Donatella Farini and De Felici Massimo

Department of Public Health and Cell Biology, Section of Histology and Embryology, University of Rome "Tor Vergata", Rome

Prof. Massimo De Felici, Dipartimento di Sanità Pubblica e Biologia Cellulare, Università di Roma "Tor Vergata", Via Montpellier, 1, 00173 Roma, Italy, Telephone: --39-06-7259 6174, Fax: --39-06-7259 6172, E-Mail: defelici{at}uniroma2.it

Received December 21, 2008; revision received February 5, 2009; accepted February 5, 2009


  Abstract

Lindane ({gamma}-HCH) was examined for its effect on primordial germ cell (PGC) development in the mouse embryo. We found that exposure by gavage of pregnant mice to 15 or 30 mg/Kg/bw lindane during the period of PGC migration and gonad colonization (from 8.5 to 11.5 days post coitum, dpc) resulted in a significant reduction of the number of germ cells within 12.5 dpc testis and ovaries (a maximum of about 25% and 40%, respectively). Similarly, lindane caused a dose-dependent decrease of the PGC number in an in vitro culture model. Further experiments showed that in such model, lindane induced features of apoptotic cell death in PGCs such as increase in caspase-3 activity, PARP cleavage and TUNEL positivity. A marked increase of the number of PGCs positive for TUNEL staining was also observed in 12.5 dpc gonads of embryos from pregnant mice subjected one day before to acute lindane treatment (60 mg/Kg/bw). Finally, we show that a brief incubation of isolated PGCs with 10-5 M lindane resulted in a marked decrease of the basal and KL-induced phosphorylation level of the AKT kinase, known to be crucial for PGC survival. Taken together these results demonstrate that embryo exposure to lindane during early stages of gametogenesis can severely impair the number of germ cells in the foetal gonads; the compound appears to affect PGC survival through a direct pro-apoptotic action likely resulting from its adverse effect on AKT activity in such cells.

Key Words: PGCs; lindane; {gamma}-HCH; apoptosis; Akt.


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