Zinc-aldehyde fixation for light-microscopic immunocytochemistry of nervous tissuesE Mugnaini and AL Dahl
Two procedures are described for vascular perfusion of the nervous system with a zinc-aldehyde fixative. The procedures, simple and economical, combine the advantages of perfusion fixation with an aldehyde solution and matrix stabilization by a mordating agent, and improve the sensitivity of the peroxidase-antiperoxidase (PAP) method for the immunocytochemical localization of several antigens. Procedure A is intended for the light-microscopic immunostaining of cellular elements containing high concentrations of antigen. Penetration of the immunoreagents is adequate without the use of detergents. Procedure B is particularly advantageous for the light-microscopic immunostaining of cellular elements that contain low concentrations of antigen, and for high-resolution microphotography. With procedure B, the tissue penetration of immunoreagents is more limited than with procedure A; however, neuronal cell bodies and dendrites are more easily penetrated by the immunoreagents than are axons. Neuronal cell bodies and dendrites thus become clearly detectable in the light-microscope, even when they are surrounded by numerous immunoreactive axon terminals, and especially after the blockage of axoplasmic transport by the topical injection of colchicine.
Volume 31,
Issue 12,
pp. 1435-1438,
12/01/1983
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