[No authors listed]
The assembly of high voltage-activated Ca(2+) channels with different β subunits influences channel properties and possibly subcellular targeting. We studied β subunit expression in the somata and axon terminals of the magnocellular neurosecretory cells, which are located in the supraoptic nucleus (SON) and neurohypophysis, respectively. Antibodies directed against the 4 Ca(V)β subunits (Ca(V)β(1)-Ca(V)β(4)) were used for immunoblots and for immunostaining of slices of these two tissues. We found that all 4 β subunits are expressed in both locations, but that Ca(V)β(2) had the highest relative expression in the neurohypophysis. These data suggest that the Ca(V)β(2) subunit is selectively targeted to axon terminals and may play a role in targeting and/or regulating the properties of Ca(2+) channels.
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