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Effects of the insecticides malathion and diazinon on the early oogenesis in mice in vitro
Author(s) -
Bonilla Edmundo,
Hernández Fidel,
Cortés Leticia,
Mendoza Miriam,
Mejía Joel,
Carrillo Edgar,
Casas Eduardo,
Betancourt Miguel
Publication year - 2008
Publication title -
environmental toxicology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.813
H-Index - 77
eISSN - 1522-7278
pISSN - 1520-4081
DOI - 10.1002/tox.20332
Subject(s) - diazinon , oogenesis , malathion , germinal vesicle , biology , oocyte , andrology , toxicology , microbiology and biotechnology , pesticide , embryo , medicine , agronomy
Malathion and diazinon are two of the most commonly used organophosphorous (OP) agrochemicals. Several studies show that these pesticides exert several effects on mammalian spermatogenesis. Nevertheless, there are no studies concerning their effects on oogenesis. The objective of this study was to evaluate the effects of these insecticides on the viability of in vitro cultured mouse oocytes during the early oogenesis and to get a further understanding of the molecular mechanisms by which OP insecticides act and affect germinal cells. Oocytes were cultured from fetal ovaries for 10 days, when most oocytes had reached the diplotene stage (germinal vesicle stage). Cultures were exposed to different concentrations of malathion or diazinon for 24 h, and the effect on oocyte viability was assessed. Gene expression in oocytes exposed to the insecticides was analyzed by generating cDNA libraries and performing differential screenings. Results show a significant decrease in oocytes survival after 24‐h exposure to 250 μM malathion or 900 nM diazinon, and the effect of these insecticides on the regulation of genes encoding proteins involved in transcription (BP75), translation (ribosomal protein S5), and mitochondrial function (cytochrome oxidase subunits I and III), providing evidence for OP insecticides as toxicants for mammals oocytes during the early oogenesis. © 2008 Wiley Periodicals, Inc. Environ Toxicol, 2008.