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Stimulation of bone marrow stromal cells conditioned medium on the expansion of mature megakaryocytes and colony forming unit--megakaryocyte {sl in vitro}

Huang Yanhong, Wang Qiru

Research Laboratory of Blood Physiology, Xiang Ya Medical School,Central South University.Changsha 410078,Hunan

Abstract

In this study, the effects of bone marrow stromal cells conditioned medium
on the expansion of mature megakaryocytes and CFU-Meg in vitro were investigated. The serum-free bone marrow fibroblast conditioned medium ( F-CM ), bone marrow endothelial cell conditioned medium ( E-CM ) and bone marrow macrophage conditioned medium ( M-CM ) were collected and ultrafiltrated by using a centriprep 10. F-CM, E-CM, M-CM, the retentate ( >10k F-CM, >10k E-CM and >10k M-CM ) contained substances whose molecular weight was more than 10k and the filtrate ( <10k F-CM, <10k E-CM and <10k M-CM ) contained substances whose molecular weight was less than 10k were added in liquid culture system respectively . The results showed that F-CM, >10k F-CM and E-CM, >10k E-CM significantly promoted the expansion of mature megakaryocytes in liquid culture system，the percentage of mature megakaryocytes compared with 0h control were （287.33±16.77）%，（236.67±39.72）%，（141.21±17.47）% and （179.03±30.98）%. But <10k F-CM, <10k E-CM, M-CM, >10k M-CM and <10k M-CM had no positive effects on the expansion of mature megakaryocytes. The effects of F-CM, E-CM or M-CM on the expansion of CFU-Meg were also investigated. The results indicated that F-CM and E-CM promoted the expansion of CFU-Meg in liquid culture system. M-CM had no positive effect on the expansion of CFU-Meg. the percentage of CFU-Meg compared with 0h control were （168.18±30.24）%，（215.17±17.4）% and（85±7）%.The results of reverse transcription-polymerase chain reaction ( RT-PCR ) showed that TGF-#beta#1 mRNA was expressed in bone marrow endothelial cells and was not expressed in bone marrow fibroblasts, TPO mRNA was expressed in bone marrow fibroblasts and was not expressed in bone marrow endothelial cells. These results suggest that F-CM, >10kDa F-CM and E-CM,>10kDa E-CM significantly promoted the expansion of mature megakaryocytes and CFU--Meg in liquid culture system. The effect of F-CM on the expansion of mature megakaryocytes is better than that of E-CM.

Key words: Bone marrow;stromal cells;Conditioned medium;megakaryocyte;expansion

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Citing This Article：

Huang Yanhong, Wang Qiru. Stimulation of bone marrow stromal cells conditioned medium on the expansion of mature megakaryocytes and colony forming unit--megakaryocyte {sl in vitro}. Acta Physiol Sin 2005; 57 (2): (in Chinese with English abstract).