Intrinsic and extrinsic regulation of T lymphocyte quiescence

Leukemia & Lymphoma
D TzachanisV A Boussiotis

Abstract

The outcome of an immune response is dependent on the interplay and complex interactions of positive (stimulatory) and negative (inhibitory) pathways and a major goal of modern immunology is to dissect these physiologic interactions in order to apply these physiologic mechanisms therapeutically. The balance of stimulatory and inhibitory signals is critical for maximizing the ability of the adoptive immune response to defend the host while maintaining immunologic tolerance and preventing autoimmunity. Cellular quiescence is a state characterized by decreased cell size and metabolic activity. The quiescent state of unstimulated T lymphocytes is thought to be due to the lack of activation signals. However, recent studies have shown that quiescence in lymphocytes is not a default state, but an actively maintained gene program. This program regulates intrinsic expression of quiescence factors in T lymphocytes. In addition to intrinsic mechanisms regulating T cell quiescence, CD4 + CD25 + regulatory T cells (Treg) naturally arising in the thymus, engage in the maintenance of immunological self-tolerance by preventing autoimmunity in vivo in a non cell-autonomous manner. Although there is still only a rudimentary knowledge of the mole...Continue Reading

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