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Localization of voltage‐sensitive L‐type calcium channels in the chicken retina

L‐type calcium channels have been associated with synaptic transmission in the retina, and are a potential site for modulation of the release of neurotransmitters. The present study documents the immunohistochemical localization of neuronal α1 subunits of L‐type calcium channels in chicken retina, using antibodies to the α1c, α1d and α1f subunits of L‐type calcium channels. The α1c‐like subunits were localized to Müller cells, with predominantly radial processes, and a prominent band of horizontal processes in the outer plexiform layer. The antibody to α1d subunits labelled most, if not all, cell bodies. The antibody to a human α1f subunit strongly labelled photoreceptor terminals. Fainter immunoreactivity was detected in the inner segments of the photoreceptors, a subset of amacrine cells, two bands of labelling in the inner plexiform layer and many ganglion cells. The differential cellular distributions of these α1‐subunits suggests subtle functional differences in their roles at different cellular locations.