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Fcμ receptor as a Costimulatory Molecule for T Cells.

Abstract：

:Fc receptor for IgM (FcμR)-deficient mice display dysregulated function of neutrophils, dendritic cells, and B cells. The relevance of FcμR to human T cells is still unknown. We show that FcμR is mostly stored inside the cell and that surface expression is tightly regulated. Decreased surface expression on T cells from elderly individuals is associated with alterations in the methylation pattern of the FCMR gene. Binding and internalization of IgM stimulate transport of FcμR to the cell surface to ensure sustained IgM uptake. Concurrently, IgM accumulates within the cell, and the surface expression of other receptors increases, among them the T cell receptor (TCR) and costimulatory molecules. This leads to enhanced TCR signaling, proliferation, and cytokine release, in response to low, but not high, doses of antigen. Our findings indicate that FcμR is an important regulator of T cell function and reveal an additional mode of interaction between B and T cells.

journal_name

Cell Rep

journal_title

Cell reports

authors

Meryk A,Pangrazzi L,Hagen M,Hatzmann F,Jenewein B,Jakic B,Hermann-Kleiter N,Baier G,Jylhävä J,Hurme M,Trieb K,Grubeck-Loebenstein B

doi

10.1016/j.celrep.2019.02.024

subject

Has Abstract

pub_date

2019-03-05 00:00:00

pages

2681-2691.e5

issue

10

issn

2211-1247

pii

S2211-1247(19)30194-9

journal_volume

26

pub_type

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