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• W1520953060 endingPage "3352" @default.
• W1520953060 startingPage "3345" @default.
• W1520953060 abstract "Hormones and neurotransmitters have both short-term and long-term modulatory effects on the activity of voltage-gated Ca2+ channels. Although much is known about the signal transduction underlying short-term modulation, there is far less information on mechanisms that produce long-term effects. Here, the molecular basis of long-lasting suppression of Ca2+ channel current in pituitary melanotropes by chronic dopamine exposure is examined. Experiments involving in vivo and in vitro treatments with the dopaminergic drugs haloperidol, bromocriptine, and quinpirole show that D2 receptors persistently decrease alpha1D L-type Ca2+ channel mRNA and L-type Ca2+ channel current without altering channel gating properties. In contrast, another L-channel (alpha1C) mRNA and P/Q-channel (alpha1A) mRNA are unaffected. The downregulation of alpha1D mRNA does not require decreases in cAMP levels or P/Q-channel activity. However, it is mimicked and occluded by inhibition of L-type channels. Thus, interruption of the positive feedback between L-type Ca2+ channel activity and alpha1D gene expression can account for the long-lasting regulation of L-current produced by chronic activation of D2 dopamine receptors." @default.
• W1520953060 created "2016-06-24" @default.
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• W1520953060 date "1999-05-01" @default.
• W1520953060 modified "2023-10-15" @default.
• W1520953060 title "Tonic Dopamine Inhibition of L-Type Ca²⁺Channel Activity Reduces α_1DCa²⁺Channel Gene Expression" @default.
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• W1520953060 doi "https://doi.org/10.1523/jneurosci.19-09-03345.1999" @default.
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