Summary
Polyclonal antibodies directed against squid opsin were used in immunocytochemical and immunoblot experiments to identify a rhodopsin-like protein in photosensitive neurons of Aplysia. Aldehyde-fixed abdominal and cerebral ganglia were embedded in paraffin for peroxidase anti-peroxidase analysis or used whole for immunofluorescence studies. Ganglia were embedded in Lowicryl K4M for electron-microscope immunocytochemistry. In both the cerebral and abdominal ganglia, light-microscope immunocytochemical results showed reaction product deposited around the neuronal cell periphery corresponding in position to the lipochondria. In the abdominal ganglion, the giant cell R2, located in the right rostral quarter, and neurons in the right caudal quarter were consistently labeled with anti-opsin. Electron-microscopic studies demonstrated ferritin-labeling of the lipochondria in R2 and other immunoreactive neurons. Immunoblot analysis of R2 and cerebral neuron extracts was used to identify two prominent immunoreactive protein bands at 85000 and 67500 molecular weight.
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Robles, L.J., Breneman, J.W., Anderson, E.O. et al. Immunocytochemical localization of a rhodopsin-like protein in the lipochondria in photosensitive neurons of Aplysia californica . Cell Tissue Res. 244, 115–120 (1986). https://doi.org/10.1007/BF00218388
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DOI: https://doi.org/10.1007/BF00218388