Integrin molecules involved in lymphocyte homing to Peyer's patches

Immunol Rev. 1989 Apr;108:45-61. doi: 10.1111/j.1600-065x.1989.tb00012.x.

Abstract

This review summarizes experiments designed to analyze lymphocyte receptors mediating recognition of and adhesion to HEV in mucosal lymphoid organs. A monoclonal antibody (R1-2) was selected which inhibits the adhesion of murine lymphocytes to Peyer's patch HEV. Antibody R1-2 recognizes the alpha chain (alpha 4m) of the murine lymphocyte cell-surface alpha beta heterodimer LPAM-1. The association of LPAM-1 alpha and beta chains requires the presence of Ca++ ions. Two proteins of Mr 84,000 and 62,000 which are also precipitated by antibody R1-2 most likely represent fragments of alpha 4m. The cross-reactivity of a monospecific rabbit anti-serum indicated that alpha 4m is analogous to the alpha chain of the human integrin molecule VLA-4. In addition, a cDNA clone encoding the human VLA-4 alpha chain hybridized with RNA from alpha 4m+ but not alpha 4m- cell lines. However, the LPAM-1 beta subunit (beta p) was shown to be immunochemically and biochemically distinct from integrin beta 1, beta 2, and beta 3, indicating that beta p represents a unique integrin beta chain. When the beta subunits associated with alpha 4m on a panel of lymphoma cell lines were analyzed, it was found that, depending on the cellular source, alpha 4m can associate with either of two beta chains: beta p or integrin beta 1. Therefore alpha 4m appears to be the common subunit of the two lymphocyte cell surface heterodimers LPAM-1 (alpha 4m/beta p) and LPAM-2 (alpha 4m/beta 1). LPAM-2 is analogous to the human VLA-4 molecule, whereas LPAM-1 represents a unique integrin heterodimer. Antibody R1-2 inhibited Peyer's patch HEV-adhesion of normal mouse lymphocytes and every lymphoma cell line tested including LPAM-1 and LPAM-2 single-positive cell lines. We also showed that the binding capacity of variants of a clonal lymphoma cell line to Peyer's patch HEV correlates with the level of LPAM-1 expression. It therefore appears that both heterodimers are involved in lymphocyte-Peyer's patch HEV interactions and that the adhesion of lymphocytes to Peyer's patch HEV is generally LPAM-1- or LPAM-2-dependent. We further investigated whether VLA-4, the human analog of LPAM-2, can mediate adhesion of human lymphocytes to HEV in mucosal lymphoid organs.(ABSTRACT TRUNCATED AT 400 WORDS)

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.
  • Review

MeSH terms

  • Animals
  • Antibodies, Monoclonal / immunology
  • Antigens, Differentiation / immunology*
  • Antigens, Differentiation / physiology
  • Antigens, Surface / physiology*
  • Calcium / physiology
  • Cell Adhesion
  • Cell Adhesion Molecules
  • Cell Movement
  • Endothelium, Vascular / physiology
  • Humans
  • Integrins
  • Lymphocyte Function-Associated Antigen-1
  • Lymphocytes / physiology*
  • Membrane Glycoproteins / physiology*
  • Mice
  • Models, Biological
  • Molecular Structure
  • Organ Specificity
  • Peyer's Patches / physiology*
  • Protein Binding
  • Receptors, Immunologic / physiology
  • Receptors, Lymphocyte Homing
  • Receptors, Very Late Antigen

Substances

  • Antibodies, Monoclonal
  • Antigens, Differentiation
  • Antigens, Surface
  • Cell Adhesion Molecules
  • Integrins
  • Lymphocyte Function-Associated Antigen-1
  • Membrane Glycoproteins
  • Receptors, Immunologic
  • Receptors, Lymphocyte Homing
  • Receptors, Very Late Antigen
  • Calcium