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Related Experiment Videos

Beta 1 integrin (CD29) expression on human postnatal T cell subsets defined by selective CD45 isoform expression.

L M Pilarski1, B R Yacyshyn, G S Jensen

  • 1Department of Immunology, University of Alberta, Canada.

Journal of Immunology (Baltimore, Md. : 1950)
|August 1, 1991
PubMed
Summary

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Integrin beta 1 (CD29) expression on T cells changes significantly during development. Childhood T cells show distinct CD29 patterns, suggesting different immune defense mechanisms before achieving adult memory status.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Integrin beta 1 (CD29) is a cell surface marker for very late activation antigen (VLA) integrins.
  • CD29 expression density fluctuates during T cell development and differentiation.

Purpose of the Study:

  • To analyze beta 1 integrin (CD29) expression on human T cell subsets across different age groups, from infancy to old age.
  • To compare CD29 expression patterns in thymocytes, cord blood T cells, and peripheral blood T cells from children and adults.

Main Methods:

  • Flow cytometry was used to analyze CD29 expression on T cell subsets from human thymus, cord blood, and peripheral blood of children and adults.
  • Expression levels of CD29, CD45RA, CD45RO, alpha 4, and alpha 5 integrin chains were quantified.

Main Results:

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  • Children's peripheral blood T cells have reduced CD29lo and CD29hi subsets compared to adults.
  • CD29hi T cells increase with age, reaching adult levels around 26 years; aged adults show nearly all T cells with CD29hi phenotype.
  • In children, CD29hi T cells are predominantly CD45RAhi, unlike adults where CD29hi T cells are CD45RA-, suggesting a distinct immune profile in early life.

Conclusions:

  • CD29 expression intensity varies with T cell differentiation and microenvironmental interactions.
  • Distinct CD29 expression patterns in children indicate unique integrin usage and immune cell populations, potentially crucial for early defense.
  • The findings support CD29 as a marker for functionally distinct T cell subsets throughout development.