Format

Send to:

Choose Destination
See comment in PubMed Commons below
Blood. 1994 Mar 1;83(5):1226-34.

Signaling and induction of enhanced cytoadhesiveness via the hematopoietic progenitor cell surface molecule CD34.

Author information

  • 1Institute of Immunology, University of Vienna, Austria.

Abstract

The transmembrane glycoprotein CD34 shows a highly restricted expression on a crucial subset of hematopoietic cells. We show here that engagement of particular determinants of CD34 can lead to signal transduction and to enhanced adhesiveness of CD34+ hematopoietic cells. Monoclonal antibodies (MoAbs) directed against O-sialoglycoprotease-sensitive epitopes of CD34 (QBEND10, ICH3, BI.3C5, MY10) but not MoAbs against O-sialoglycoprotease-resistant epitopes (9F2, 8G12) induce actin polymerization in KG-1a and KG-1 cells and strongly enhanced cytoadhesiveness. The capacity to induce adhesion requires cellular energy, divalent cations, and intact cytoskeleton but not de novo protein synthesis. The observed cytoadhesion seems at least in part to be caused by a concomitant activation of the beta 2 integrin cytoadhesion pathway. It can be significantly inhibited with lymphocyte function-associated antigen-1 and intercelluar adhesion molecule-1 antibodies. Protein kinase inhibition analyses suggest that the pathways initiated by engagement of the CD34 molecule with certain CD34 MoAbs involves protein tyrosine kinases but that protein kinase C is not critically involved.

PMID:
7509653
[PubMed - indexed for MEDLINE]
Free full text
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire
    Loading ...
    Write to the Help Desk