目前脂肪细胞的培养技术已较成熟,尤其是脂肪源性干细胞的分离培养与定向诱导分化的研究是目前研究的一大热点。具体脂肪源性干细胞分离培养方法为:用缓冲液反复冲洗脂肪组织,剪刀剪碎,0.075%的胶原酶,37℃消化30~50min,800g离心10min,沉淀成分为基质血管层(SVF),DMEM培养基重悬细胞,筛网过滤离心,弃上清。用培养基重悬细胞,细胞种植在培养板或培养皿中,24h后倒掉原来的培养液,去除未贴壁的红细胞和残渣,剩余的贴壁细胞群体称为加工过脂肪吸取物(processedlipoaspirate,PLA)。切除的脂肪组织获得的SVF中含有非常复杂的细胞成分,包括内皮细胞、平滑肌细胞、血管周细胞、Fb、前脂肪细胞和分化潜能确定的其他前体细胞,因此PLA中含有以上的细胞成分和假想的多能干细胞成分。原代培养贴壁的细胞较少,细胞生长至融合时传代;传代以后的细胞称为ADSCs。传代时,以0.25%胰蛋白酶、1mmol/L EDTA,于37℃下消化细胞3~4min,按1∶2~1∶3比例传代,2~3d半量换液一次,300ml脂肪组织可得到(2~6)×108个PLA细胞,其在体外的生长状态类似Fb和MSCs。
(伍津津)
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