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- W1976985910 abstract "The thymus produces several putative thymic hormones: thymosin alpha 1, thymulin, and thymopoietin, which have been reported to circulate and to act on both prothymocytes and mature T cells in the periphery, thus maintaining their commitment to the T cell system. These endocrine influences decline with age and are associated with thymic menopause and cellular immune senescence, which contribute to the development of diseases in the aged. Thymus endocrinology is characterized by the action of many hormones and hormone-like substances on the cellular components of the thymus, including thymocytes, thymic epithelial cells, and thymic stromal cells. The intrathymic environment is characterized by a complex network of paracrine, autocrine, and endocrine signals involving both interleukins and thymic peptides, which can be envisioned to operate in a synergistic network to carry the evolving T cell through its stepwise development to a mature T cell. Extrathymic influences regulating the secretory function of thymic epithelial cells and the stepwise evolution of T cells can be ascribed to circulating interleukins, mainly IL1 and IL2, derived from activation and secretion of leukocytes in the periphery. These interleukins act in a synergistic fashion at all levels of T cell development by the induction of high-affinity IL2 receptors and the resultant IL2-dependent proliferative responses. To determine whether exogenous administration of interleukins would induce T lymphocyte development in aged mice, we chemically thymectomized aged mice with a steroid hormone and treated them with mixed interleukins or thymic hormones such as thymosin. We found that mixed interleukins, but not thymosin, restored thymic weight and cellularity and enhanced thymocyte responses to interleukins and mitogen. Thymosin potentiated the effect." @default.
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- W1976985910 date "1992-12-01" @default.
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- W1976985910 title "Thymic Involution in Aging Prospects for Correction" @default.
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- W1976985910 doi "https://doi.org/10.1111/j.1749-6632.1992.tb27458.x" @default.
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