BACKGROUND:Bone marrow mesenchymal stem cels can produce a variety of cytokines to provide some support for the growth and proliferation of myeloma cels.
OBJECTIVE:To investigate the effects of astragalus polysaccharides on the proliferation of bone marrow mesenchymal stem cels from patients with multiple myeloma and cytokine secretion.
METHODS:Bone marrow mesenchymal stem cels were isolated by density gradient centrifugation from the bone marrow of a healthy volunteer and a multiple myeloma patient, and were cultured and identified. Passage 3 bone marrow mesenchymal stem cels were colected, and the growth curve was depicted by the enzyme marker method. MTT method and flow cytometry were used to detect the effects of different concentrations (0.5, 1, 2, 4, 6, 8 g/L) of astragalus polysaccharides on the proliferation and cel cycle of bone marrow mesenchymal stem cels. The expression levels of interleukin-1β and interleukin-6 were detected by ELISA method.
RESULTS AND CONCLUSION:Bone marrow mesenchymal stem cels from both the healthy control and multiple myeloma patient showed negative expression of CD34 and positive expression of CD44. The obtained cels from two sources had the characteristics of bone marrow mesenchymal stem cels. Cels from the healthy control had significantly shorter doubling time than those from the myeloma patient. After treated with 1 and 2 g/L astragalus polysaccharide, cel proliferation rate in the multiple myeloma group was significantly higher than that in the healthy control group; after treated with 6 and 8 g/L astragalus polysaccharide, the cel proliferation rate was significantly lower in the multiple myeloma group than in the healthy control group. After treated with 1 g/L astragalus polysaccharide, compared with the healthy control, the proportion of bone marrow mesenchymal stem cels from the multiple myeloma patient in G0/G1 phase was significantly decreased, while the proportions of cels in both S phase and G2/M phase from the myeloma patient were significantly increased. Interleukin-1β and interleukin-6 levels of bone marrow mesenchymal stem cels from the patient with multiple myeloma were significantly higher than those of cels from healthy control. After intervention with 0.5, 1, 2 g/L astragalus polysaccharide, the interleukin-1β and interleukin-6 levels of bone marrow mesenchymal stem cels from the patient with multiple myeloma were al significantly decreased. In conclusion, a certain concentration of astragalus polysaccharides can promote the proliferation of bone marrow mesenchymal stem cels and decrease the levels of interleukin-6 and interleukin-β in patients with multiple myeloma.