Predicting CD62L expression during the CD8+ T-cell response in vivo

Abstract

Acute infection leads to CD8+ T-cell activation, division and differentiation. Following clearance of infection, cells revert to two distinct subsets of memory, central (TCM) and effector (TEM) memory. Adoptive transfer of naive T-cell receptor transgenic (TCR-tg) T cells has been used to study the differentiation of these memory subsets, which are often discriminated by expression of CD62L. Naive CD8+ T cells are CD62Lhigh, and CD62L expression is lost during the 'effector' phase. Adoptive transfer studies show that higher transfer frequencies result in diminished T-cell expansion and a higher proportion CD62Lhigh. This suggests a relationship between CD62L expression and cell division, where division leads to conversion from CD62Lhigh to CD62Llow phenotype. To address this hypothesis we adoptively transferred graded numbers of OT-1 TCR-tg T cells from naive donors and tracked the kinetics and phenotype of the immune response after infection. We developed a simple mathematical model of division-linked CD62L differentiation, which we compared with the experimental data. Our results show that division-linked differentiation predicts the differences in proportion of cells CD62Lhigh observed between responses of different adoptive transfer number and within individual mice. We calculate that approximately 20% of CD62Lhigh cells convert to CD62Llow during each division. © 2010 Australasian Society for Immunology Inc. All rights reserved.