This study was purposed to culture murine compact bone-derived mesenchymal stem cell (MSC) and analyze the immunological and trilineage differentiation potential. Tibia and femur were extracted. Bone marrow cells were flushed out and compact bone fragments were digested with collagenase. The digested cells were cultured in 6-well plates. The immunophenotype, immunosuppressive function and trilineage differentiation potential were analysed by flow cytometry, mixed lympocyte reaction and Oil red O, von Kossa and alcian blue straining, respectively. The results indicated that the pure compact bone MSC could be isolated with in 3 weeks. The resulting MSC had trilineage differentiation potential and immunosuppressive effect on mixed lymphocyte reaction. The count per minute (CPM) value in control group of BALB/c T cells cocultured with irradiated C57BL/6 T cells was (2.56 ± 0.31) × 10(4), while CPM values of mixed lymphocyte cocultured with C57BL/6 compact bone MSC at ratios of 100:1 and 10:1 were (0.47 ± 0.12) × 10(4) and (0.28 ± 0.09) × 10(4). The CPM value of control group was higher than those of MSC cocultured group (P < 0.001). Compact bone-MSC had an immunosuppressive effect on mixed lymphocyte reaction in a dose dependent manner. It is concluded that murine compact bone has rich MSC and the primary MSC is contaminated with less hematopoietic cells. Murine compact bone-MSC have immunosuppressive effect on mixed lymphocyte reaction and trilineage differentiation potential. Compact bone-MSC have promising experimental study value.
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