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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Immunol 2014 ; 192 (7): 2961-4 Nephropedia Template TP
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Resident memory CD8 T cells occupy frontline niches in secondary lymphoid organs #MMPMID24600038
Schenkel JM; Fraser KA; Masopust D
J Immunol 2014[Apr]; 192 (7): 2961-4 PMID24600038show ga
Resident memory CD8 T cells (TRM) comprise a non-recirculating subset positioned in non-lymphoid tissues (NLT) to provide early responses to re-infection. While TRM are associated with NLT, we asked whether they populated secondary lymphoid organs (SLO). We show that a subset of virus specific memory CD8 T cells in SLO exhibit phenotypic signatures associated with TRM, including CD69 expression. Parabiosis revealed that SLO CD69+ memory CD8 T cells do not circulate, defining them as TRM. SLO TRM were overrepresented in IL-15 deficient mice, suggesting independent regulation compared to TCM and TEM. These cells were positioned at SLO entry points for peripheral antigens: the splenic marginal zone, red pulp, and lymph node sinuses. Consistent with a potential role in guarding SLO pathogen entry points, SLO TRM did not vacate their position in response to peripheral alarm signals. These data extend the range of tissue resident memory to SLO.