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Peripheral CD8(+) T cells mainly use CD8alpha/beta, and their development is mainly dependent on the major histocompatibility complex (MHC) class I proteins K(b) and D(b) in H-2(b) mice. In this report, we have shown that the development of CD8alpha/beta TCR-alpha/beta cells in lymphoid organs as well as in intestinal intraepithelial lymphocytes (iIELs) is dependent on the MHC class I K(b) and D(b) proteins. In contrast, TCR-alpha/beta CD8alpha/alpha cells are found mainly in iIELs, and their numbers are unaffected in K(b)D(b) double knockout mice. Most of the TCR-gamma/delta cells in the iIELs also bear CD8alpha/alpha, and they are also unaffected in K(b)D(b) -/- mice. In beta2-microglobulin (beta2m)-deficient mice, all of the TCR-alpha/beta CD8alpha/alpha and CD8alpha/beta T cells disappear, but TCR-gamma/delta cells are unaffected by the absence of beta2m.

Development of Cd8α/α and Cd8α/β T Cells in Major Histocompatibility Complex Class I–Deficient Mice