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Characterization of CD44 antigen during lymphoid ontogeny

A Collado1, A de Andres, E Cañadas

  • 1Servicio de Análisis Clínicos e Inmunología, Hospital Virgen de las Nieves, Universidad de Granada, Spain.

Immunobiology
|September 1, 1991
PubMed

Insights

The CD44 molecule is expressed on mature B cells but not on proliferating or pre-B cells. Protein kinase C activation drives B cell differentiation without affecting CD44 antigen expression.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • The CD44 molecule is a cell surface glycoprotein involved in cell adhesion and signaling.
  • Its expression patterns are crucial for understanding lymphocyte development and function.

Purpose of the Study:

  • To characterize the CD44 molecule using a newly produced monoclonal antibody (mAb), GRHL-1.
  • To analyze the expression of CD44 in B lineage cells and its regulation during differentiation.

Main Methods:

  • Immunohistological analysis of human tissues using GRHL-1 mAb.
  • Biochemical analysis of 125I-labeled lymphocyte lysates via SDS-PAGE.
  • Investigating the role of Protein Kinase C (PKC) in CD44 expression during B cell differentiation.

Main Results:

  • GRHL-1 mAb demonstrated comparable reactivity to other CD44 cluster antibodies across various human tissues.
  • CD44 expression was observed in mature B cells but absent in pre-B and Burkitt cell lines.
  • CD44 was downregulated in proliferating B cells within germinal centers.
  • PKC activation induced in vitro differentiation of pre-B cells but did not upregulate CD44 expression.

Conclusions:

  • The GRHL-1 mAb is a reliable tool for studying CD44 expression.
  • CD44 expression is a marker of mature B cell phenotype and is regulated during B cell proliferation and differentiation.
  • PKC-mediated differentiation of B cells occurs independently of CD44 upregulation.

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