Histopathological effects of Diazinon (DZ) were studied on adrenal gland in virgin young female mice divided into five groups (10 animals each): (1) Control (untreated); (2) and (3) 9 and 18 mg kg(1 single exposure groups (given distilled water on day 1 and 2 and DZ on day 3); (4) and (5) 9 and 18 mg kg(1 multiple exposure groups (given respective DZ doses on days 1Á3). All doses were applied by gavage. Animals were euthanized by cervical dislocation on day 6. Adrenals were removed surgically for histological and micrometric assessments of medulla and cortex. Histological examination of adrenal medulla revealed apoptotic changes and granular depletion in chromaffin cells while cortex gave impression of increased thickness of Zona Fasciculata following multiple DZ exposures. Mean cell sizes in cortical and medullary regions showed dose and exposure dependent significant decline. In conclusion, DZ exposure caused granular depletion in chromaffin cells indicating a rapid release of adrenaline and increased fascicular thickness indicating an anticipated shift from adrenal sex steroids to glucocorticoids biosynthesis and release. Apoptotic changes and significant decline in mean cell sizes of cortical and medullary regions were considered as the outcomes of oxidative and biosynthetic stresses of DZ exposure.
Pregnant mice (10 in 4 groups each) were exposed to diazinon (DZN) at 10 and 20 mg/kg on gestation day 6 (GD 6), 9 and 12. A group of 10 pregnant animals was maintained as untreated control. The ovaries were exteriorized on GD 18 by euthanizing the animals. The tissues were processed for histopathological and micrometric analysis. Oocytic nuclear derangements in terms of size increase followed by leakage of nuclear contents with increased duration of exposure were seen. Follicular and luteal cells also showed necrosis. The morphometric data showed significant increase in oocyte and para-follicular size (P_0.0001) along with similar increase in nuclear sizes (P_0.001). These findings indicate that DZN is toxic to bring about histopathological and micrometric derangements in the ovaries of the treated pregnant females.
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