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• W2201332258 abstract "The metabotropic GABA receptor (GABA B R) regulates calcium influx in neurons. Whole cell voltage-clamp techniques were employed to determine the effects of internal calcium on the activity of GABA B Rs. GABA B R receptor apparent affinity was maximal when bis-( o-aminophenoxy)- N,N,N′,N′-tetraacetic acid (BAPTA) maintained internal calcium below 70 nM. Apparent affinity was reduced as internal calcium increased. EGTA did not produce similar effects, suggesting that localized increases in calcium influenced GABA B R apparent affinity. Confocal imaging disclosed relatively high internal calcium just below the plasma membrane of isolated neurons. BAPTA, but not EGTA, reduced this ring of high calcium. Heparin, dantrolene, and ryanodine increased GABA B R apparent affinity, effects similar to that of BAPTA. Calmodulin inhibitors also increased receptor apparent affinity. These results suggest that internally released calcium activates calmodulin, which reduces GABA B R apparent affinity. This identifies a reciprocal system in which the metabotropic GABA receptor can reduce calcium influx, but internal calcium can suppress this receptor pathway. Metabotropic glutamate receptors linked to inositol 1,4,5 trisphosphate (InsP 3 ) raised internal calcium and suppressed the action of GABA B Rs. Thus negative feedback systems control the balance between excitatory and inhibitory metabotropic receptor pathways in retinal neurons." @default.
• W2201332258 created "2016-06-24" @default.
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• W2201332258 date "1999-12-01" @default.
• W2201332258 modified "2023-10-16" @default.
• W2201332258 title "Internal Calcium Modulates Apparent Affinity of Metabotropic GABA Receptors" @default.
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• W2201332258 doi "https://doi.org/10.1152/jn.1999.82.6.3298" @default.
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