Abstract
A potent cytolytic pore-forming protein (PFP, perforin, or cytolysin) is associated with the cytoplasmic granules of cytotoxic T lymphocytes (CTL) and natural killer (NK) cells. The role of PFP/perforin in cytolytic reactions carried out in vivo is still unclear. Here, the authors performed immunohistochemical analysis using antibodies monospecific for perforin and made use of a murine uveitis model produced by intracameral inoculation of herpes simplex virus I (HSV-I). The main cell infiltrate found in the anterior segment of virus-inoculated eyes consisted of Thy-1+/asialo GM1+/CD8-/CD4- cells, presumably representing NK cells. Perforin staining was detected mainly in cells bearing this phenotype. Perforin was only detected in cells displaying the large granular lymphocyte morphology. A small number of perforin-positive cells (less than 5%) colabeled as CD8+, indicating that these cells could have belonged to the CTL lineage. These observations show for the first time the presence of perforin-containing NK cells in tissues of animals undergoing acute viral infections.
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