Abstract
SEVERAL attempts have been made to correlate changes in the fine structure of synaptic regions of vertebrate photoreceptor cells with dark or light adaption1–5. Synaptic vesicles in both rods and cones were reported to be reduced in size after prolonged exposure to darkness1,2. Later workers3–5, however, have not substantiated these claims. Mountford3 did not find any changes in vesicle populations in photoreceptors in response to changes in illumination; neither did Cragg4, although he did find that receptor terminals increased in width after prolonged periods in the dark, and decreased in width after only 3 min of exposure to daylight. Wagner5 showed in fish retina, that in animals kept under a constant day–night regime, the numbers of synaptic ribbons were reduced in fish fixed towards the end of the night period.
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MONAGHAN, P., OSBORNE, M. Light-induced formation of dense-core vesicles in rod photoreceptors in retina of Xenopus laevis. Nature 257, 586–587 (1975). https://doi.org/10.1038/257586a0
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DOI: https://doi.org/10.1038/257586a0
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