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• W2022391162 abstract "Leptin can exert its potent appetite-suppressing effects via activation of hypothalamic proopiomelanocortin (POMC) neurons. It depolarizes POMC neurons via activation of a yet unidentified nonselective cation current. Therefore, we sought to identify the conductance activated by leptin using whole-cell recording in EGFP-POMC neurons from transgenic mice. The TRPC channel blockers SKF96365 (1-[beta-[3-(4-methoxyphenyl)propoxy]-4-methoxyphenethyl]-1H-imidazole hydrochloride), flufenamic acid, and 2-APB (2-aminoethyl diphenylborinate) potently inhibited the leptin-induced current. Also, lanthanum (La(3+)) and intracellular Ca(2+) potentiated the effects of leptin. Moreover, the diacylglycerol-permeable analog OAG (2-acetyl-1-oleoyl-sn-glycerol) failed to activate any TRPC current. Using a Cs(+)-gluconate-based internal solution, the leptin-activated current reversed near -20 mV. After replacement of external Na(+) and K(+) with Cs(+), the reversal shifted to near 0 mV, and the I/V curve exhibited a negative slope conductance at voltages more negative than -40 mV. Based on scRT-PCR, TRPC1 and TRPC4-7 mRNA were expressed in POMC neurons, with TRPC5 being the most prevalent. The leptin-induced current was blocked by the Jak2 inhibitor AG490, the PI3 kinase inhibitor wortmannin, and the phospholipase C inhibitors, U73122 and ET-18-OCH3. Notably, we identified PLCgamma1 transcripts in the majority of POMC neurons. Therefore, leptin through a Jak2-PI3 kinase-PLCgamma pathway activates TRPC channels, and TRPC1, 4, and 5 appear to be the key channels mediating the depolarizing effects of leptin in POMC neurons." @default.
• W2022391162 created "2016-06-24" @default.
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• W2022391162 date "2010-01-27" @default.
• W2022391162 modified "2023-10-18" @default.
• W2022391162 title "Leptin Excites Proopiomelanocortin Neurons via Activation of TRPC Channels" @default.
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• W2022391162 doi "https://doi.org/10.1523/jneurosci.4816-09.2010" @default.
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