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Presence of CD4 and CD8 determinants on CD4-CD8- murine thymocytes: passive acquisition of CD8 accessory molecules

E W Shores1, S O Sharrow, A Singer

  • 1Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.

European Journal of Immunology
|April 1, 1991
PubMed

Insights

Thymocytes can acquire CD4 and CD8 accessory molecules from other cells, rather than producing them. This passive acquisition means low-level expression of these molecules doesn't always define distinct thymocyte subsets.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • CD4 and CD8 are critical accessory molecules for T cell development.
  • Thymocyte subpopulations are often defined by the expression of CD4 and CD8.
  • The origin of low-level CD4/CD8 expression on certain thymocytes remains unclear.

Purpose of the Study:

  • To investigate whether thymocytes can passively acquire CD4 and CD8 accessory molecules.
  • To determine if low-level CD4/CD8 expression on double-negative thymocytes results from acquisition.

Main Methods:

  • Analysis of CD4 and CD8 expression on thymocytes.
  • In vivo and in vitro mixing experiments using thymocytes with different CD8 alleles (Ly-2.1 and Ly-2.2).

Main Results:

  • Most CD4-CD8- thymocytes showed low levels of CD4 and CD8.
  • Detection of CD4/CD8 on CD4-CD8- cells was dependent on the presence of CD4+/CD8+ cells.
  • Thymocytes expressing Ly-2.1 acquired and expressed the Ly-2.2 allele from other cells.

Conclusions:

  • Thymocytes can passively acquire cell surface CD8 molecules they do not synthesize.
  • Low-level surface expression of CD4/CD8 differentiation molecules may not indicate distinct thymocyte subpopulations.
  • This finding challenges traditional definitions of thymocyte subsets based solely on CD4/CD8 expression.

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