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Peripheral helper T cells, mavericks of peripheral immune responses

Journal

INTERNATIONAL IMMUNOLOGY
Volume -, Issue -, Pages -

Publisher

OXFORD UNIV PRESS
DOI: 10.1093/intimm/dxad041

Keywords

autoimmune; CXCL13; peripheral tissues; tertiary lymphoid structure; Tph cells

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This review summarizes the phenotype and function of peripheral helper T (Tph) cells and discusses their role in rheumatoid arthritis (RA) as well as their diversity in different diseases and immune development.
Peripheral helper T (Tph) cells have been established, through intensive efforts to elucidate local immune responses in human rheumatoid arthritis (RA), as a CD4 subset intimately involved in acquired immunity in peripheral tissues. Initially, Tph cells were noted as a CD4 population that produces high levels of CXCL13 in RA synovial tissues, followed by a demonstration of their ability to help B cells. In contrast to follicular helper T (Tfh) cells, Tph cells do not express the transcription factor BCL6 but express molecules such as CXCL13, interleukin (IL)-21, and inducible T-cell costimulator (ICOS) to help B cells in peripheral tissues. Subsequent studies showed that Tph cells are associated with various diseases, including autoimmune diseases, infections, and malignancies, and with the development of early life immunity. This review summarizes the phenotype and function of Tph cells in RA and discusses their differentiation and diversity in various conditions.

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