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Phenotypic Identification of Antigen-Dependent and Antigen-Independent CD8 CTL Precursors in the Draining Lymph Node During Acute Cutaneous Herpes Simplex Virus Type 1 Infection¹

Department of Microbiology and Immunology, Louisiana State University Medical Center, School of Medicine, Shreveport, LA 71130

Optimal immunological control of cutaneous herpes simplex virus type 1 (HSV-1) infections initiated in the hind footpad of C57BL/6 (B6, H-2^b) mice is dependent upon the presence of functional HSV-1-specific T lymphocytes. The class I MHC-restricted, CD8⁺ T cell subpopulation is involved in the clearance of infectious HSV-1 from the skin and limiting HSV-1 replication and spread within the peripheral nervous system. However, the frequency of HSV-1-specific CTL precursors (CTLp), as a measure of potential anti-viral CD8⁺ T cell function, is relatively low compared with other acute viral infections. To gain insight into the basis for this low functional frequency, changes in the CD8⁺ T cell subpopulation phenotype associated with activation and differentiation were investigated. Analysis of the phenotypic changes showed that HSV-1-specific CTLp were found predominantly within a subpopulation of CD8⁺ T cells expressing high levels of CD44 (CD44^high) and high levels of the IL-2 receptor -chain (CD25^high). A second activated subpopulation of CD8⁺ T cells expressing the CD44^high CD25^low phenotype did not contain detectable HSV-1-specific CTLp, even after the addition of HSV-1-infected stimulator cells as a source of an exogenous Ag. These data suggested that HSV-1-specific CD8⁺ T cells must increase expression of CD25 before attaining the potential to become CTL effector cells. These findings also indicated that the up-regulation of CD44 alone is not sufficient to identify precisely HSV-1-specific CD8⁺ T cells.

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