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. 1993 Jun;142(6):1695–1700.

Two types of putative preneoplastic lesions identified by hexosaminidase activity in whole-mounts of colons from F344 rats treated with carcinogen.

T P Pretlow 1, M A O'Riordan 1, K M Spancake 1, T G Pretlow 1
PMCID: PMC1887005  PMID: 8506941

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.

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Selected References

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