Differential expression of class II MHC antigens in subpopulations of human hematopoietic progenitor cells

O. G. Ottmann, K. H. Nocka, M. A.S. Moore, L. M. Pelus

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Expression of major histocompatibility complex class II Ags HLA-DR, HLA-DP, and HLA-DQ on human BM granulocyte-erythroid-macrophage-megakaryocyte CFU (CFU-GEMM), BFU-E, and CFU-GM was examined by indirect immunofluorescence, cell sorting, and complement-mediated cytotoxicity. BM, highly enriched for progenitor cells by depletion of mature hematopoietic elements, was further separated by sterile sorting into HLA-DR (-), low, intermediate, and high intensity HLA-DR (+), as well as HLA-DP (+) and HLA-DP (-) cell fractions and assayed for progenitor cell content. In addition, in the case of HLA-DR, CFU-GM response to inhibition by prostaglandin E was determined. Cell sorting and cytotoxicity data confirm that approximately 95% of assayable erythroid, myeloid, and multipotential progenitor cells expressed HLA-DR, whereas HLA-DQ Ags were undetectable. HLA-DR and HLA-DP Ags were co-expressed on 61% of these progenitor cells, predominantly those expressing HLA-DR at high intensity. Day 7 and 14 CFU-GM showed a trend toward segregation to the high HLA-DR (+) cell fractions, especially when recombinant human G-CSF was used to stimulate clone formation. Both day 7 and day 14 CFU-GMs were found predominantly in the HLA-DP (+) cell fraction. In contrast, BFU-E and CFU-GEMM were found in the low intensity HLA-DR cell fraction and predominantly in the HLA-DP (-) fraction. Both eosinophils CFU and cells giving rise to basophil/mast cells in suspension culture were found in the low and intermediate intensity HLA-DR fractions, but could be segregated into HLA-DP (+) and HLA DP (-) cell fractions, respectively. Functional analysis on day 7 CFU-GM segregated, based upon HLA-DR intensity, indicated a positive correlation, between increasing HLA-DR intensity and responsiveness to inhibition by prostaglandin E. Furthermore, only those CFU-GM expressing HLA-DR at high intensity could be removed by cytolytic treatment using a mAb anti-HLA-DR previously shown to be selective for CFU-GM responsive to PGE and in S phase of the cell cycle.

Original languageEnglish (US)
Pages (from-to)677-686
Number of pages10
JournalLeukemia
Volume2
Issue number10
StatePublished - Jan 1 1988

ASJC Scopus subject areas

  • Hematology
  • Oncology
  • Cancer Research

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    Ottmann, O. G., Nocka, K. H., Moore, M. A. S., & Pelus, L. M. (1988). Differential expression of class II MHC antigens in subpopulations of human hematopoietic progenitor cells. Leukemia, 2(10), 677-686.