Quantitative, video-based histochemistry to measure regional effects of anticholinesterase pesticides in rat brain.

Journal Article (Journal Article)

Acetylcholinesterase histochemistry was coupled to inexpensive and widely available apparatus for video microscopy and densitometry to study enzyme activity and inhibition in different parts of the rat brain. Quantitative histochemistry, under properly defined conditions, yielded an output that increased linearly with incubation time and section thickness and was a smooth hyperbolic function of substrate concentration. The time-course of staining after in vivo exposure to eserine revealed no sign that carbamate-induced cholinesterase inhibition was readily reversed in vitro. Brains from rats treated either with a carbamate or an organophosphate anticholinesterase pesticide showed significant regional variation in cholinesterase inhibition. The histochemical data corresponded well with data from biochemical assays of acetylcholinesterase activity (overall correlation coefficient of absolute values, r = 0.95). Also, a comparison of assay types by two-way analysis of variance showed no significant main effect. These results support the conclusion that video-based histochemistry is suitable for detailed studies of developmental and toxicological influences on cholinesterases in multiple microscopic regions of the rat brain.

Full Text

Duke Authors

Cited Authors

  • Hammond, PI; Jelacic, T; Padilla, S; Brimijoin, S

Published Date

  • October 1996

Published In

Volume / Issue

  • 241 / 1

Start / End Page

  • 82 - 92

PubMed ID

  • 8921169

Electronic International Standard Serial Number (EISSN)

  • 1096-0309

International Standard Serial Number (ISSN)

  • 0003-2697

Digital Object Identifier (DOI)

  • 10.1006/abio.1996.0381


  • eng