Journal of Neuroscience, Vol 13, 4091-4100, Copyright © 1993 by Society for Neuroscience
Unexpected presence of neurofilaments in axon-bearing horizontal cells of the mammalian retina
L Peichl and J Gonzalez-Soriano
Max-Planck-Institut fur Hirnforschung, Frankfurt/M., Germany.
In several mammals only one of the two types of retinal horizontal cell,
the axonless A-type, appears to express neurofilaments. Neurofilament
immunostaining of rodent retinas reveals a horizontal cell plexus that has
previously been interpreted as belonging to A-type cells. Our intracellular
Lucifer yellow injections strongly suggest that there are no A-type
horizontal cells in rat and gerbil. Counterstaining of dye-injected
cellular structures with a neurofilament antibody directly shows that the
axon terminal systems of the axon-bearing B-type horizontal cells contain
neurofilaments. These unexpected findings explain and reinterpret the
neurofilament plexus in rodent retinas. In contrast, Lucifer yellow
injections in guinea pig retina reveal both A- and B-type horizontal cells,
showing that horizontal cell types are not uniform among rodents. In the
guinea pig retina both A-type cells and B-type axon terminal systems
contain neurofilaments.