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Antibodies against neuroactive amino acids and neuropeptides. I. A new two-step procedure for their conjugation to carrier proteins and the production of an anti-Met-enkephalin antibody reactive with glutaraldehyde-fixed tissues

KH Meyer, DM Behringer and RW Veh

Abteilung fur Neuroanatomie, Ruhr-Universitat Bochum, Federal Republic of Germany.

We developed a new two-step procedure to couple haptens to bovine serum albumin (BSA) via glutaraldehyde (GA). After activation of BSA with excess GA and removal of unreacted GA, the hapten was bound to the activated protein in a second step. This two-step procedure is easy to use, the desired molecular ratio of coupled hapten to protein is conveniently adjusted, and no visible precipitation of the conjugate is detected. Using a low peptide concentration, nearly 50% of the inserted haptens are bound to the protein, and unbound expensive peptide can be recovered after Sephadex chromatography. Antisera to neuroactive amino acids (GABA, glycine, and glutamate) and neuropeptides (Met-enkephalin) were prepared by immunization of rabbits with these conjugates. Immunological analysis of immune sera by dot-blot and ELISA techniques and subsequent removal of crossreactivities by solid-phase adsorption yielded monospecific antibodies, which were further purified by affinity chromatography. The immunocytochemical specificities of these purified antibodies were verified in adjacent sections of GA-fixed rat spinal cord. Pre-embedding staining with anti-Met-enkephalin in combination with post-embedding staining for amino acids such as GABA allowed double staining of the two antigens in a single semi-thin section.

Volume 39, Issue 6, pp. 749-760, 06/01/1991
Copyright © 1991 by The Histochemical Society


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