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• W1968112781 abstract "Glomus cells within the carotid body are known to respond to hypoxic stimuli. Recently, these cells have been shown to express the long form of the leptin receptor (Ob-Rb). However, whether these glomus cells expressing the Ob-Rb are activated by hypoxic stimuli is not known. Therefore, in this study we investigated whether intermittent hypoxia (IH) or changes in circulating levels of leptin induced phosphorylated signal transducer and activator of transcription 3 (pSTAT3), the immediate early gene c-fos protein, or fos-related antigen-1 protein (Fra-1) within carotid body glomus cells that expressed the Ob-Rb, and within neurons of the petrosal (PG) and nodose (NG) ganglia. Rats were subjected to IH (120 s normoxia, 80s hypoxia for 8h) or normoxia (8h), or intravenous injections of leptin (50 or 200 ng/0.1 mL) or the vehicle saline. Plasma leptin levels were measured in animals exposed to IH and normoxia. Exposure to 8h of IH increased plasma leptin levels greater than 2-fold compared to normoxic controls. Animals were then perfused with Zamboni's fixative, and the region of the carotid bifurcation containing the carotid body and PG/NG complex was removed, paraffin embedded and sectioned at 6 μm for immunohistochemical processing. Carotid body glomus cells were identified by their expression of tyrosine hydroxylase immunoreactivity. These glomus cells also expressed the OB-Rb and were found to express pSTAT3-, fos-, and Fra-1-like immunoreactivity in response to both IH and systemic leptin injections. IH and leptin injections also increased fos and Fra-1 like expression in the PG, NG and jugular ganglion. Taken together, these data suggest IH alters circulating leptin which in turn activates directly carotid body glomus cells to exert a modulatory effect on the peripheral chemoreceptor reflex." @default.
• W1968112781 created "2016-06-24" @default.
• W1968112781 creator A5020872633 @default.
• W1968112781 creator A5029737411 @default.
• W1968112781 creator A5058338869 @default.
• W1968112781 date "2012-03-01" @default.
• W1968112781 modified "2023-09-23" @default.
• W1968112781 title "Intermittent hypoxia and systemic leptin administration induces pSTAT3 and Fos/Fra-1 in the carotid body" @default.
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• W1968112781 doi "https://doi.org/10.1016/j.brainres.2012.01.074" @default.
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