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An atypical CD 8 T‐cell response to Chlamydia muridarum genital tract infections includes T cells that produce interleukin‐13
Author(s) -
Johnson Raymond M.,
Kerr Micah S.,
Slaven James E.
Publication year - 2014
Publication title -
immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.297
H-Index - 133
eISSN - 1365-2567
pISSN - 0019-2805
DOI - 10.1111/imm.12248
Subject(s) - biology , immunology , cd8 , t cell , immune system , chlamydia , tumor necrosis factor alpha , antigen , cytotoxic t cell , biochemistry , in vitro
Summary Chlamydia trachomatis urogenital serovars D–K are intracellular bacterial pathogens that replicate almost exclusively in human reproductive tract epithelium. In the C. muridarum mouse model for human Chlamydia genital tract infections CD 4 T helper type 1 cell responses mediate protective immunity while CD 8 T‐cell responses have been associated with scarring and infertility. Scarring mediated by CD 8 T cells requires production of tumour necrosis factor‐ α ( TNF ‐ α ); however, TNF ‐ α is associated with protective immunity mediated by CD 4 T cells. The latter result suggests that TNF ‐ α in‐and‐of itself may not be the sole determining factor in immunopathology. CD 8 T cells mediating immunopathology presumably do something in addition to producing TNF ‐ α that is detrimental during resolution of genital tract infections. To investigate the mechanism underlying CD 8 immunopathology we attempted to isolate Chlamydia ‐specific CD 8 T‐cell clones from mice that self‐cleared genital tract infections. They could not be derived with antigen‐pulsed irradiated naive splenocytes; instead derivation required use of irradiated immune splenocyte antigen‐presenting cells. The Chlamydia ‐specific CD 8 T‐cell clones had relatively low cell surface CD 8 levels and the majority were not restricted by MHC class Ia molecules. They did not express Plac8 , and had varying abilities to terminate Chlamydia replication in epithelial cells. Two of the five CD 8 clones produced interleukin‐13 ( IL ‐13) in addition to IL ‐2, TNF ‐ α , IL ‐10 and interferon‐ γ . IL ‐13‐producing Chlamydia ‐specific CD 8 T cells may contribute to immunopathology during C. muridarum genital tract infections based on known roles of TNF ‐ α and IL ‐13 in scar formation.