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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Effects of polyglycolic acid on porcine smooth muscle cell growth and differentiation
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Effects of polyglycolic acid on porcine smooth muscle cell growth and differentiation

机译:聚乙醇酸对猪平滑肌细胞生长和分化的影响

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Polyglycolic acid (PGA) is commonly used as a scaffold for tissue engineering. Recent studies utilized PGA as a scaffold for vascular tissue engineering using bovine and porcine smooth muscle cells (SMCs). In engineered vessels, the SMCs displayed high rates of mitosis and dedifferentiation in areas where PGA fragments were present. We hypothesized that PGA breakdown products, sequestered within a SMC vessel at the conclusion of culture, led to increased proliferation and dedifferentiation of vascular SMCs. To test this hypothesis, the current study assessed possible means by which PGA breakdown products could lead to changes in SMC phenotype. SMCs grown in high concentrations of PGA breakdown products showed, by Western blotting, decreased expression of calponin, a marker for SMC differentiation. The same was true for SMCs grown in glycolic acid (GA), which also showed decreased expression of proliferating cell nuclear antigen (PCNA), a marker for SMC proliferation. In contrast, cells grown in varying amounts of NaCl or HCl showed little change in differentiation. We conclude that, independent of acidity or osmolality, plausible products of PGA degradation appear to induce dedifferentiation of porcine SMCs in vitro. Because of dedifferentiation and decreased mitosis, commercially available PGA may not represent an optimal scaffold for vascular tissue engineering.
机译:聚乙醇酸(PGA)通常用作组织工程的支架。最近的研究将PGA用作使用牛和猪平滑肌细胞(SMC)进行血管组织工程的支架。在工程船只中,SMC在存在PGA碎片的区域显示出高的有丝分裂和去分化率。我们假设在培养结束时隔离在SMC血管中的PGA分解产物导致血管SMC增殖和去分化增加。为了验证这一假设,当前的研究评估了PGA分解产物可能导致SMC表型改变的可能方式。通过Western印迹,在高浓度PGA分解产物中生长的SMC显示出钙蛋白的表达降低,钙蛋白的表达是SMC分化的标志。对于乙醇酸(GA)中生长的SMC,情况也是如此,后者还显示出增殖细胞核抗原(PCNA)(SMC增殖的标志物)的表达下降。相反,在不同量的NaCl或HCl中生长的细胞在分化方面几乎没有变化。我们得出的结论是,独立于酸度或重量摩尔渗透压浓度,PGA降解的可能产物似乎在体外诱导了猪SMC的去分化。由于去分化和减少的有丝分裂,可商购的PGA可能不代表血管组织工程的最佳支架。

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