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• W2083674897 abstract "Bacterial endotoxin lipopolysaccharide (LPS) is known to suppress gonadotropin secretion and this effect is assumed to be mediated by cytokines. In the present study, we examined whether LPS affected hypothalamic electrical activity associated with LH pulses, and whether tumor necrosis factor-α (TNF-α), a major cytokine induced by LPS, was involved in this process. Ovariectomized rats were fitted with chronically implanted electrode arrays in the mediobasal hypothalamus, and multiunit activity (MUA) was recorded under conscious, unrestrained conditions. Blood samples were withdrawn every 6min through an indwelling atrial catheter for determining serum LH concentrations. Intravenous (iv) injection of LPS (1μg) suppressed characteristic increases (volleys) in MUA associated with LH pulses throughout the experimental period up to 5h. This suppressive effect of LPS on MUA volleys was significantly attenuated by simultaneous intracerebroventricular (icy) injection of the antibody (50ng) to TNF-α through an indwelling cannula in the lateral ventricle. These changes in MUA were faithfully reflected in the LH secretory pattern. Further, either iv (0.4-2μg) or icy (20-250 ng) injection of TNF-α suppressed the frequency of MUA volleys and associated LH pulses in a dose-dependent manner. These results suggest that LPS leads to the suppression of gonadotropin-releasing hormone pulse generator activity through a mechanism involving TNF-α." @default.
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• W2083674897 date "1997-01-01" @default.
• W2083674897 modified "2023-10-15" @default.
• W2083674897 title "Tumor Necrosis Factor-.ALPHA. Mediates Endotoxin Induced Suppression of Gonadotropin-Releasing Hormone Pulse Generator Activity in the Rat." @default.
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• W2083674897 doi "https://doi.org/10.1507/endocrj.44.141" @default.
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