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A Coronin 1-Dependent Decision Switch in Juvenile Mice Determines the Population of the Peripheral Naive T Cell Compartment.

Journal of immunology (Baltimore, Md. : 1950) (2017-08-20)
Mathias Jakob Lang, Mayumi Mori, Julie Ruer-Laventie, Jean Pieters
ABSTRACT

Following thymic maturation, T cells egress as recent thymic emigrants to peripheral lymphoid organs where they undergo an additional maturation step to mature naive T cells that circulate through secondary lymphoid organs ready to be activated upon pathogenic challenges. Thymic maturation and peripheral T cell survival depend on several signaling cascades, but whether a dedicated mechanism exists that exclusively regulates homeostasis of mature naive T cells without affecting thymocytes and/or recent thymic emigrants remains unknown. In this article, we provide evidence for a specific and exclusive role of the WD repeat containing protein coronin 1 in the maintenance of naive T cells in peripheral lymphoid organs. We show that coronin 1 is dispensable for thymocyte survival and development, egress from the thymus, and survival of recent thymic emigrants. Importantly, coronin 1-deficient mice possessed comparable levels of peripheral T cells within the first 2 wk after birth but failed to populate the peripheral T cell compartment at later stages. Furthermore, dendritic cell- and IL-2/7-dependent T cell survival was found to be independent of coronin 1. Together, these results suggest the existence of a hitherto unrecognized coronin 1-dependent decision switch early during life that is responsible for peripheral naive T cell survival and homeostasis.

MATERIALS
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Product Description

Sigma-Aldrich
TRI Reagent®, For processing tissues, cells cultured in monolayer or cell pellets
SAFC
MEM Non-essential Amino Acid Solution (100×), without L-glutamine, liquid, sterile-filtered, BioReagent, suitable for cell culture
Sigma-Aldrich
Sodium pyruvate solution, 100 mM, sterile-filtered, BioReagent, suitable for cell culture
Sigma-Aldrich
IgG from rat serum, technical grade, ≥80% (SDS-PAGE), buffered aqueous solution