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Regulation of mycobacterial growth by the hypothalamus-pituitary-adrenal axis: differential responses of Mycobacterium bovis BCG-resistant and -susceptible mice.

机译:下丘脑-垂体-肾上腺轴对分枝杆菌生长的调节:牛分枝杆菌BCG耐药和易感小鼠的差异反应。

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The role of the hypothalamus-pituitary-adrenal (HPA) axis in regulating the growth of Mycobacterium avium in Mycobacterium bovis BCG-resistant and -susceptible congenic mice was evaluated. Restraint was used to activate the HPA axis, which resulted in an increase in the level of corticosterone in the plasma. Activation of the HPA axis increased the susceptibility of BALB/c.Bcgs mice to the growth of M. avium. In contrast, the growth of M. avium was not altered in BALB/c.Bcgr mice as a result of HPA activation. Adrenalectomy abolished the effect of HPA activation on mycobacterial growth, as did treatment of the mice with a glucocorticoid receptor antagonist, RU 486. Activation of the HPA axis also resulted in the increased susceptibility of splenic macrophages from Bcgs mice but not from Bcgr mice to M. avium growth in vitro. The production of tumor necrosis factor alpha and of reactive nitrogen intermediates by splenic macrophages from both strains of mice was suppressed as a result of HPA activation. The implications of these findings for resistance controlled by Bcg and for susceptibility to mycobacterial growth are discussed.
机译:评估了下丘脑-垂体-肾上腺(HPA)轴在牛分枝杆菌BCG耐药和易感的同基因小鼠中调节鸟分枝杆菌生长的作用。使用约束来激活HPA轴,从而导致血浆中皮质酮水平的增加。 HPA轴的激活增加了BALB / c.Bcgs小鼠对鸟分枝杆菌生长的敏感性。相反,由于HPA激活,在BALB / c.Bcgr小鼠中鸟分枝杆菌的生长没有改变。肾上腺切除术消除了HPA激活对分枝杆菌生长的影响,对糖皮质激素受体拮抗剂RU 486的治疗也是如此。HPA轴的激活还导致脾脏巨噬细胞对Bcgs小鼠的敏感性增加,但对Bcgr小鼠对M的敏感性却不高禽体外生长。 HPA激活可抑制两种小鼠脾脏巨噬细胞产生肿瘤坏死因子α和反应性氮中间体。讨论了这些发现对Bcg控制的耐药性和对分枝杆菌生长的敏感性的意义。

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