Journal
JOURNAL OF COMPARATIVE PATHOLOGY
Volume 127, Issue 4, Pages 280-289Publisher
ELSEVIER SCI LTD
DOI: 10.1053/jcpa.2002.0595
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An increase in metallothionein I and II (MT I/II) mRNA concentrations has been reported in the central nervous system of scrapic-infected rodents. In this study we compared cattle with bovine spongiform encephalopathy (BSE), cattle affected by neurological disease other than BSE, and clinically healthy cattle in respect of MT I/II immunoreactivity in brainstem medullary tissue. Marked astrocytic MT I/II immunolabelling was seen in all BSE-affected animals, in contrast to clinically healthy cases, in which no such labelling was detected. In BSE, MT I/II immunoreactive astrocytes were confined specifically to areas of vacuolation or abnormal prion protein (PrPBSE) deposition, or both. MT I/II immunolabelling was also seen in a small number of animals with a neurological disease other than BSE. These findings complement previous studies by demonstrating increased levels of MT I/II in transmissible spongiform encephalopathy (TSE)-infected brain tissue, indicating that MT I/II may play some as yet unidentified role in the response to TSE infection. (C) 2002 Elsevier Science Ltd. All rights reserved.
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