CD8+ T lymphocyte-mediated lysis of Chlamydia-infected L cells using an endogenous antigen pathway.
Intracellular bacterial pathogens have evolved to either grow in the nutrient-rich cytoplasm or remain sequestered within a vacuole. One potentially important selective advantage for growth within a vacuole may be evasion of cell-mediated detection and cytolysis. To address this question we used the endosomally confined bacterium Chlamydia trachomatis, which naturally infects epithelial cells, to examine CTL-mediated lysis of nonphagocytic cells. CTL-mediated lysis of infected target cells was detected, although the increased expression of ICAM-1 by transfection was required. The elimination of CD8+ T cells or addition of brefeldin A or cycloheximide eliminated specific cytolysis, whereas conversely, treatment with chloroquine or ammonium chloride had only minor effects. These results implicate endogenous Ag processing for Chlamydia-specific cytolysis. This work demonstrates CTL-mediated lysis of cells infected with an intracellular bacterium that inhibits lysosomal fusion and is confined to an endosomal vacuole.
Beatty
P R
PR
Program in Infectious Diseases, University of California at Berkeley 94720.
Stephens
R S
RS
D000818:Animals; D017951:Antigen Presentation / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D002692:Chlamydia trachomatis / Q000276:immunology*; D003602:Cytotoxicity, Immunologic / Q000502:physiology*; D011992:Endosomes / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D015395:Histocompatibility Antigens Class I / Q000235:genetics; D018799:Intercellular Adhesion Molecule-1 / Q000276:immunology; D007371:Interferon-gamma / Q000276:immunology; D007739:L Cells; D051379:Mice; D008809:Mice, Inbred C3H
D015395:Histocompatibility Antigens Class I; D018799:Intercellular Adhesion Molecule-1; D007371:Interferon-gamma