Ca2+ Current versus Ca2+ Channel Cooperativity of Exocytosis

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Ca Current versus Ca Channel Cooperativity of Exocytosis

Victor Matveev,1 Richard Bertram,2,3,4 and Arthur Sherman5 1Department of Mathematical Sciences, New Jersey Institute of Technology, Newark, New Jersey 07102-1982, 2Department of Mathematics and Programs in 3Neuroscience and 4Molecular Biophysics, Florida State University, Tallahassee, Florida 32306, and 5Laboratory of Biological Modeling, National Institute of Diabetes and Digestive and Kidney...

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Removal of Ca2+ Channel β3 Subunit Enhances Ca2+ Oscillation Frequency and Insulin Exocytosis

An oscillatory increase in pancreatic beta cell cytoplasmic free Ca2+ concentration, [Ca2+]i, is a key feature in glucose-induced insulin release. The role of the voltage-gated Ca2+ channel beta3 subunit in the molecular regulation of these [Ca2+]i oscillations has now been clarified by using beta3 subunit-deficient beta cells. beta3 knockout mice showed a more efficient glucose homeostasis com...

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PKC-induced Sensitization of Ca2+-dependent Exocytosis Is Mediated by Reducing the Ca2+ Cooperativity in Pituitary Gonadotropes

The highly cooperative nature of Ca2+-dependent exocytosis is very important for the precise regulation of transmitter release. It is not known whether the number of binding sites on the Ca2+ sensor can be modulated or not. We have previously reported that protein kinase C (PKC) activation sensitizes the Ca2+ sensor for exocytosis in pituitary gonadotropes. To further unravel the underlying mec...

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Ca2+ cooperativity in neurosecretion measured using photolabile Ca2+ chelators.

1. The photolabile Ca2+ chelator DM-nitrophen was injected into crayfish motor neuron terminals and photolyzed with light flashes of different intensity to determine the cooperativity of Ca2+ action in releasing neurotransmitter. 2. Each flash elicited a phasic postsynaptic response resembling an excitatory junctional potential, apparently due to a presynaptic "spike" in intracellular calcium c...

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An Inhibitory Effect of Extracellular Ca2+ on Ca2+-Dependent Exocytosis

AIM Neurotransmitter release is elicited by an elevation of intracellular Ca(2+) concentration ([Ca(2+)](i)). The action potential triggers Ca(2+) influx through Ca(2+) channels which causes local changes of [Ca(2+)](i) for vesicle release. However, any direct role of extracellular Ca(2+) (besides Ca(2+) influx) on Ca(2+)-dependent exocytosis remains elusive. Here we set out to investigate this...

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ژورنال

عنوان ژورنال: Journal of Neuroscience

سال: 2009

ISSN: 0270-6474,1529-2401

DOI: 10.1523/jneurosci.0263-09.2009