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Specific immune responses but not basal functions of B and T cells are impaired in aged mice.

机译:在衰老的小鼠中,特异性免疫应答受到了损害,但B和T细胞的基础功能并未受到损害。

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摘要

Senescence is characterized by several alterations in the immune system. Such modifications can be found in lymphoid organs as well as in the cellular components of the immune system. Several reports have suggested that immune dysfunction can affect both T and B cells, but T cells have been shown to be more susceptible to the effects of aging. B cell function may also be altered with reduction in germinal center formation, antibody response, and affinity maturation of antibodies. Herein we showed that although antigen-specific antibody response to a soluble antigen declines in 18-month old mice, total levels of serum antibodies as well as frequencies of spleen and bone marrow antibody-producing cells are increased in aged mice. In addition, proliferative response of non-stimulated spleen T cells from aged mice were augmented and insensitive to increasing doses of concanavalin A stimulation as compared to young mice that showed a typical dose-dependent response to mitogen stimulation in vitro. These data suggest that the higher activation mode of B and T cells in senescent mice is a result of an increased frequency of cells committed to previous antigenic experiences and with poor ability to respond to novel antigenic challenges.
机译:衰老的特征是免疫系统发生多种变化。可以在淋巴器官以及免疫系统的细胞成分中发现这种修饰。几篇报道表明免疫功能障碍可同时影响T细胞和B细胞,但已证明T细胞更易受到衰老的影响。 B细胞功能也可能随着生发中心形成,抗体反应和抗体亲和力成熟的降低而改变。本文中我们显示,尽管在18个月大的小鼠中对可溶性抗原的抗原特异性抗体应答下降,但在老年小鼠中血清抗体的总水平以及脾脏和骨髓产生抗体的细胞的频率增加。此外,与年幼的小鼠相比,其对体外促分裂原刺激的剂量依赖性反应具有典型的剂量依赖性,与之相比,老年小鼠的非刺激性脾T细胞的增殖反应增强,并且对剂量增加的伴刀豆球蛋白A刺激不敏感。这些数据表明,衰老小鼠中B细胞和T细胞的较高激活模式是致力于先前抗原经历的细胞频率增加且对新抗原挑战的应答能力差的结果。

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