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A double-label pre-embedding immunoperoxidase technique for electron microscopy using diaminobenzidine and tetramethylbenzidine as markers
RB Norgren and MN Lehman
Department of Anatomy and Cell Biology, University of Cincinnati College of Medicine, Ohio 45267-0521.
Techniques for correlative double-label immunocytochemistry (ICC) at light and electron microscopic (EM) level are useful for determining the neurotransmitter phenotype of inputs onto immunocytochemically identified neurons. Tetramethylbenzidine (TMB) has been used as a chromogen at the EM level for horseradish peroxidase tract tracing. We have found that TMB, in combination with diaminobenzidine (DAB), can be used in a double-label immunocytochemical protocol to examine neuropeptide Y inputs onto luteinizing hormone-releasing hormone cells in the sheep preoptic area. At both light and EM levels, TMB reaction product is visibly distinct from DAB reaction product. The ultrastructural preservation we have been able to obtain with our technique is better than that obtained with techniques that use TMB at a lower pH. Furthermore, this technique allows the demonstration of synaptic contacts between neurochemically identified terminals and cells with different neurotransmitter phenotypes.
Volume 37,
Issue 8,
pp. 1283-1289,
08/01/1989
Copyright © 1989 by The Histochemical Society
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