Allen S, Sotos J, Sylte M J, Czuprynski C J
Department of Bacteriology, College of Agriculture and Life Sciences, University of Wisconsin-Madison, Madison, WI 53706, USA.
Clin Diagn Lab Immunol. 2001 Mar;8(2):460-4. doi: 10.1128/CDLI.8.2.460-464.2001.
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.
副结核分枝杆菌是巨噬细胞的一种细胞内病原体,可导致反刍动物患慢性肠炎(副结核病)。本研究的目的是确定副结核分枝杆菌感染是否会导致牛单核细胞凋亡。使用Hoechst 33342染色,我们观察到在感染副结核分枝杆菌后6小时内凋亡单核细胞数量增加,并且在24小时和48小时时这些数量进一步增加。这种效应似乎需要活菌,因为用热灭活的副结核分枝杆菌感染的单核细胞凋亡没有显著增加。在用副结核分枝杆菌感染之前,将单核细胞与牛生长激素预孵育并没有显著改变凋亡细胞的数量。