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Front Immunol. 2011 Mar 21;2:6. doi: 10.3389/fimmu.2011.00006. eCollection 2011.

A CD25⁻ positive population of activated B1 cells expresses LIFR and responds to LIF.

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  • 1Immunobiology Laboratory, Center for Oncology and Cell Biology, The Feinstein Institute for Medical Research Manhasset, NY, USA.

Abstract

B1 B cells defend against infectious microorganisms by spontaneous secretion of broadly reactive "natural" immunoglobulin that appears in the absence of immunization. Among many distinguishing characteristics, B1 B cells display evidence of activation that includes phosphorylated STAT3. In order to identify the origin of pSTAT3 we examined interleukin-2 receptor (IL-2R) expression on B1 cells. We found that some (about 1/5) B1a cells express the IL-2R α chain, CD25. Although lacking CD122 and unresponsive to IL-2, B1a cells marked by CD25 express increased levels of activated signaling intermediates, interruption of which results in diminished CD25. Further, CD25⁺ B1a cells contain most of the pSTAT3 found in the B1a population as a whole. Moreover, CD25⁺ B1a cells express leukemia inhibitory factor receptor (LIFR), and respond to LIF by upregulating pSTAT3. Together, these results define a new subset of B1a cells that is marked by activation-dependent CD25 expression, expresses substantial amounts of activated STAT3, and contains a functional LIFR.

KEYWORDS:

B1 cells; CD25; LIF receptor; signaling

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