| Literature DB >> 8506941 |
T P Pretlow1, M A O'Riordan, K M Spancake, T G Pretlow.
Abstract
Previous studies identified as putative preneoplastic lesions 1) enzyme-altered foci in sections of methacrylate-embedded colon and 2) aberrant crypts in methylene blue-stained unembedded (whole-mount) colon and established that aberrant crypts embedded in methacrylate had enzyme alterations. We have now studied histochemically demonstrable hexosaminidase activity in unembedded or whole-mount preparations of colons from carcinogen-treated rats. These preparations have revealed two populations of crypts that are enzyme-altered: those that are morphologically altered or aberrant and those that are morphologically normal. Both populations can be quantified rigorously in less than an hour with whole-mount preparations reacted for hexosaminidase. The demonstration of phenotypic characteristics with histochemical techniques in whole-mount preparations should have wide applicability to functional studies in many normal and diseased tissues.Entities:
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Year: 1993 PMID: 8506941 PMCID: PMC1887005
Source DB: PubMed Journal: Am J Pathol ISSN: 0002-9440 Impact factor: 4.307