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a First Department of Pathology, Transplantation Center, Kansai Medical Center, Moriguchi-City, Japan;
b Tukuba Research Institute, Novartis Pharma, Tukuba-City, Japan;
c Department of Hygiene, Transplantation Center, Kansai Medical Center, Moriguchi-City, Japan
Key Words. Hematopoietic stem cells • Stromal cells • Restriction • MHC Class Ia • Cobblestone colony
Correspondence:
Susumu Ikehara, M.D., Ph.D., First Department of Pathology, Kansai Medical University, 10-15 Fumizono, Moriguchi-City, Osaka 570-8506 Japan. Telephone: 81-6-6993-9429; Fax: 81-6-6994-8283; e-mail: ikehara{at}takii.kmu.ac.jp
We have previously found that a significant number of hematopoietic progenitors accumulate in engrafted bones with the same major histocompatibility complex (MHC) as the transplanted bone marrow cells. In the present study, to further clarify the MHC restriction between hematopoietic stem cells (HSC) and microenvironment, we carried out cobblestone colony formation assays by culturing HSCs with MHC-matched or -mismatched stromal cell monolayers. The formation of cobblestone colonies under MHC-mismatched stromal cells significantly decreased in comparison with MHC-matched stromal cells. However, the decrease in cobblestone colony formation under MHC-mismatched stromal cells was not significant when using MHC class I-deficient HSC or stromal cells. Taken together with the results using B10 congenic strains, it is suggested that the MHC preference is restricted by MHC class Ia molecules. Treatment with monoclonal antibodies (mAbs) against MHC class Ia molecules of stromal cell phenotypes significantly enhanced the cobblestone colony formation, whereas treatment with mAbs against HSC phenotypes significantly inhibited it. The expression of cytokines to promote hematopoiesis was enhanced by the mAbs against stromal cell phenotypes. The enhancement of cytokine expression was also observed when stromal cells and HSCs were MHC-matched. These results suggest that signaling via the MHC molecules augments stromal cell activity and elicits the MHC restriction.
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