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Experimental study of differentiation of umbilical cord mesenchymal stem cells into smooth muscle cells induced by bladder smooth muscle cells conditioned medium



Experimental study of differentiation of umbilical cord mesenchymal stem cells into smooth muscle cells induced by bladder smooth muscle cells conditioned medium



Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi 27(12): 1506-1511



To observe whether umbilical cord mesenchymal stem cells (UCMSCs) can differentiate into the smooth muscle cells (SMCs) induced by bladder SMCs (BSMCs) conditioned medium so as to seek an alternative seed cells for the repair and reconstruction of the urology system. UCMSCs and BSMCs were harvested from umbilical cord of full-term births and bladder tissues which were obtained from patients who underwent a radical cystectomy. BSMCs conditioned medium was prepared by mixing supernatant of BSMCs at passages 1-5 with complete medium at ratio of 1:1. UCMSCs at passage 3 were cultured with BSMCs conditioned medium (induced group, group A) and complete medium (control group, group B), respectively; simple BSMCs served as positive control group (group C). The morphological changes of co-cultured UCMSCs were observed by inverted phase microscope, the expressions of a-smooth muscle actin (a-SMA), Calponin, and smooth muscle myosin heavy chain (SM-MHC) of UCMSCs were tested by immunofluorescence staining and Western blot at 7 and 14 days. The morphology of UCMSCs in group A started to change from a polygonal and short spindle shape to a large and spindle shape after co-culture, which was similar to BSMCs morphology; but the morphology of UCMSCs did not change obviously in group B. Immunofluorescence staining showed that the expressions of alpha-SMA, Calponin, and SM-MHC were positive in group C. At 7 days, the expression of a-SMA could be observed in groups A and B; at 14 days, the positive expression of alpha-SMA increased gradually in group A, but it did not increase in group B. At 7 days, a positive expression of Calponin could be observed in group A, and positive expression increased obviously at 14 days; the expression of Calponin could not be observed at 7 and 14 days in group B. However, the expression of SM-MHC could not be observed in groups A and B. The results of Western blot showed the expressions of alpha-SMA, Calponin, and SM-MHC protein were consistent with the results of immunofluorescence staining. UCMSCs have the potential of differentiation into SMCs and may be a potential seed cells for bladder tissue engineering.

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Accession: 053133123

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PMID: 24640375


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