Journal of Clinical Immunology

, Volume 16, Issue 3, pp 151–158

Abnormalin vitro thymocyte differentiation in a patient with severe combined immunodeficiency-Nezelof's syndrome

  • Alan P. Knutsen
  • Donna Wall
  • Kathleen R. Mueller
  • John D. Bouhasin
Original Articles

Abstract

Anin vitro coculture model system of CD34+ stem cells and allogenic cultured thymic epithelia fragments was used to evaluate thymocyte differentiation in a 9-month-old child of Amish descent with Nezelof syndrome. Though the patient's stem cells differentiate to acquire normal expression of CD2 and CD7, later steps of maturation were abnormal. There was detectable but reduced expression of CD3 and CD4 phenotypes. CD44+ expression, however, was markedly reduced. CD44 is an adhesion molecule, interacting with the matrix ligands hyaluronan and fibronectin, and is expressed early in thymocyte differentiation and subsequently in mature T cells. It is hypothesized that abnormal expression of CD44 in a variant of severe combined immunodeficiency, Nezelof's syndrome, interferes with normal thymocyte and thymic epithelial interaction, which leads to abnormal thymocyte differentiation.

Key words

Severe combined immunodeficiency (SCID) CD34+ stem cells cultured thymic epithelia thymocyte differentiation 

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Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • Alan P. Knutsen
    • 1
  • Donna Wall
    • 1
  • Kathleen R. Mueller
    • 1
  • John D. Bouhasin
    • 1
  1. 1.Department of Pediatrics, Pediatric Research InstituteSt. Louis University Health Sciences CenterSt. Louis

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