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Optimization of tyrosine hydroxylase immunocytochemistry in paraffin sections using pretreatment with proteolytic enzymes

AC Towle, JM Lauder and TH Joh

Immunocytochemical localization of tyrosine hydroxylase (TH) was performed on paraffin sections pretreated with various proteolytic enzymes. It was found that pretreatment with trypsin (1.2 mg/ml) for 5 min resulted in a dramatic increase in the number of TH-positive terminals throughout the brain, especially in the cerebellum, which contains fine preterminal and terminal axons that are difficult to stain. This pretreatment also led to a significant reduction in background staining and allowed for the use of the TH antiserum at high working dilutions. Several other proteolytic enzymes were tested and only chymotrypsin was nearly as effective as trypsin with respect to TH staining.

Volume 32, Issue 7, pp. 766-770, 07/01/1984
Copyright © 1984 by The Histochemical Society


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