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Dense HRP filling in pre-fixed brain tissue for light and electron microscopy

GH Kageyama and RL Meyer

The use of neuroanatomical markers in tissues that have been pre-fixed has been virtually ignored, even though this approach could offer certain advantages over in vivo methods, in terms of convenience of application and choice of markers. We have found that HRP can be used on well-fixed brains of cats and goldfish to fill neurons, dendrites, axons, terminals, glial cells, and glial processes for high-resolution light microscopy and electron microscopy. Best results were obtained using brains that were perfusion-fixed with 2.5% depolymerized paraformaldehyde and 1.5% glutaraldehyde. Two methods of HRP application were used: optically guided injections of microliter quantities into various regions of cat brain, and optic nerve fills in goldfish by attaching an HRP-filled polyethylene tube for periods of 1 day to 2 weeks. HRP applied in these ways to pre-fixed tissue was found to fill neurons or glial cells with solid label in the anterograde and retrograde directions.

Volume 35, Issue 10, pp. 1127-1136, 10/01/1987
Copyright © 1987 by The Histochemical Society


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