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2001:
Allen S; Sotos J; Sylte M J; Czuprynski C J
Use of Hoechst 33342 staining to detect apoptotic changes in bovine mononuclear phagocytes infected with Mycobacterium avium subsp. paratuberculosis.
Clinical and diagnostic laboratory immunology 2001;
8(
2):.
Mycobacterium avium subsp. paratuberculosis is an intracellular pathogen of macrophages that causes a chronic enteritis (Johne's disease) in ruminants. The purpose of this study was to determine whether M. avium subsp. paratuberculosis infection causes apoptosis in bovine monocytes. Using Hoechst 33342 staining, we observed increased numbers of apoptotic monocytes within 6 h of infection with M. avium subsp. paratuberculosis, and these numbers increased further at 24 and 48 h. This effect appeared to require viable bacilli, because monocytes infected with heat-killed M. avium subsp. paratuberculosis did not exhibit a significant increase in apoptosis. Preincubation of monocytes with bovine growth hormone prior to infection with M. avium subsp. paratuberculosis did not significantly alter the number of apoptotic cells.
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