Toll-like receptor 2 activation induces C-C chemokine receptor 2-dependent natural killer cell recruitment to the peritoneum.

Immunology and Cell Biology
Ian D HaidlJean S Marshall

Abstract

Natural killer (NK) cells are innate effector cells with critical roles not only in tumor immunosurveillance and viral immunity, but also in bacterial and fungal infections. Toll-like receptor 2 (TLR2) can be important in the early and sustained immune responses to pathogens and tumors through the induction of cytokines and chemokines that recruit and activate immune effector cells. We investigated the role of TLR2 activation in NK cell recruitment with a view to informing approaches to induce or regulate peritoneal NK cell responses therapeutically. Peritoneal injection of TLR2 activators, including peptidoglycan and the lipopeptides FSL-1 and Pam3 CSK4 , resulted in NK cell recruitment after 16 h with increased NK cell numbers maintained for 48 h. TLR2 activators induced large amounts of CCR2 ligands, but much smaller amounts of CCR5 and CXCR3 ligands. Consistent with this observation, NK cell migration was abrogated in CCR2-deficient mice after peritoneal FSL-1 injection. Adoptive transfer of CCR2-deficient NK cells prior to peritoneal FSL-1 activation confirmed a cell-intrinsic component of CCR2-mediated NK cell migration. TLR2 activation did not induce an activated NK cell phenotype, but significant changes included an inc...Continue Reading

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Methods Mentioned

BETA
PCR
lavages
lavage
flow cytometry
FCS
PCRs

Software Mentioned

FCS Express
Prism
GraphPad
Bio
FlowJo
Rad CFX Manager

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