Hspa8 and ICAM-1 as damage-induced mediators of γδ T cell activation

Journal of Leukocyte Biology: An Official Publication of the Reticuloendothelial Society

article

Margarete D. Johnson¹  Michel F. Otuki²  Daniela A. Cabrini²  Ross Rudolph³  Deborah A. Witherden¹  Wendy L. Havran¹ 

[1] Department of Immunology and Microbiology, The Scripps Research Institute;Department of Pharmacology, Federal University of Parana;Division of Plastic Surgery, University of California San Diego;Deborah A. Witherden and Wendy L. Havran were joint senior investigators.;Deceased January 20

关键词: activation;    DETC;    healing;    skin;    wound;   

DOI  :  10.1002/JLB.3AB0420-282R

学科分类：生理学

来源: Federation of American Societies for Experimental Biology

【 摘 要 】

Tissue-resident γδ T cells form the first line of defense at barrier surfaces where they survey host tissue for signs of stress or damage. Following recognition of injury, γδ T cells play a crucial role in the wound-healing response through the production of growth factors and cytokines that promote proliferation in surrounding epithelial cells. To initiate this response, γδ T cells require interactions with a variety of epithelial-expressed costimulatory molecules in addition to primary signaling through their TCR. In the epidermis these signals include the coxsackie and adenovirus receptor (CAR), histocompatibility antigen 60c (H60c), and plexin B2, which interact with γδ T cell-expressed junctional adhesion molecule-like protein (JAML), NKG2D, and CD100, respectively. Here we identify heat shock protein family A member 8 (Hspa8) and ICAM-1 as two additional keratinocyte-expressed costimulatory molecules for epidermal resident γδ T cells (termed DETC). These molecules were rapidly up-regulated in the epidermis following wounding in both mouse and human tissue. Both Hspa8 and ICAM-1 had a costimulatory effect on DETC, inducing proliferation, CD25 up-regulation, and IL-2 production. We also provide evidence that DETC can be activated through the potential ICAM-1 and Hspa8 receptors LFA-1 and CD316. Finally, knockdown of Hspa8 in keratinocytes reduced their ability to activate DETC in culture and ICAM-1 −/− mice exhibited impaired rates of healing in skin-organ culture suggesting a role for these proteins in the DETC-mediated damage response. Together with previous work on CAR, H60c, and plexin B2, these results add to a picture of a complex keratinocyte wound signature that is required for efficient DETC activation.

【 授权许可】

CC BY