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In a variety of cells, secretory processes require the activation of both Rab27a and L-type channels of the CaV1.3 subtype. In the retinal pigment epithelium (RPE), Rab27a and CaV1.3 channels regulate growth-factor secretion towards its basolateral side. Analysis of murine retina sections revealed a co-localization of both Rab27a and CaV1.3 at the basolateral membrane of the RPE. Heterologously expressed...
The coupling distance between presynaptic Ca 2+ influx and the sensor for vesicular transmitter release determines speed and reliability of synaptic transmission [1, 2]. Nanodomain coupling (<100 nm) favors fidelity [1, 2] and is employed by synapses specialized for escape reflexes [3] and by inhibitory synapses involved in synchronizing fast network oscillations [1]. Cortical glutamatergic...
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