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目的 探讨系统性红斑狼疮(SLE)患者骨髓间充质干细胞(MSCs)多向分化能力是否存在异常. 方法 密度梯度离心法和贴壁筛选法分离培养MSCs,定向诱导骨髓MSCs向脂肪和成骨细胞分化,脂肪细胞经油红O染色鉴定并定量,成骨细胞经茜素红S染色鉴定.将骨髓MSCs与羟基磷灰石共孵育,将共孵育物植于裸鼠皮下,8周后常规苏木素-伊红(HE)染色.反转录-聚合酶链反应(RT-PCR)检测过氧化物酶体增殖物激活受体γ-2(PPARγ-2)、脂蛋白酶(LPL)、Runx2/CBFA1、降钙素(osteocalcin) mRNA的表达水平.结果 SLE骨髓MSCs分化成脂肪细胞比例低于健康埘照组,油红O染色定量低于健康对照组[(35±7)%与(80±5)%],(0.14±0.04与0.27±0.04),LPL mRNA表达低于健康对照组(0.369±0.020与0.481±0.038),两组PPARγ-2 mRNA表达差异无统计学意义(0.421±0.052与0.441±0.012).SLE骨髓MSCs分化成骨细胞后形成钙结节低于健康对照组[(35±4)%与(45±4)%],Runx2/CBFA1、osteocalcin mRNA表达低于健康对照组(0.371±0.000与0.563±0.069),(0.819±0.023与0.962±0.049);羟基磷灰石与SLE患者骨髓MSCs共孵育后移植裸鼠皮下8周后,成骨细胞形成明显少于健康埘照组. 结论 SLE骨髓MSCs成脂和成骨分化能力存在异常,提示SLE患者骨髓MSCs存在缺陷.

Objective To investigate the muhilineage differentiation potential of bone marrow-derived mesenchymM stem eels (MSCs) in patients with systemic lupus erythematosus (SLE).Methods Density gradient centrifugation and plastic adherence methods were used for isolation of marrow-derived MSCs.Then tIIeir differentiation potentiality to lipoblasts and osteoblasts waft tested.MSCs loading on hydroxyapatite were elnbedded in the nude mouse's subcutaneous tissues.Eight weeks later.osteogenesis was evaluated by HE staining.PPA Rγ2,LPL,Runx2/CBFA1,osteocalcin gene expression in MSCs after differentiation were examined by RT-PCR.Results The positive rates of lipoblasts stained by oil red O and optical density in SLE were decreased than in the control group[(35±7)% vs (80±5)%] (0.14±0.04 vs 0.27±0.04),and the positive rates of osteoblasts stained by Alizarin Red S in SLE were decreased than those in the control group [(35±4)% vs (45±4)%].Osteoblast differentiation in the SLE group was less than that of the contro]group.The mRNA expression of LPL (0.369±0.020 vs 0.481±0.038).Runx2/CBFA1 (0.371±0.000 vs 0.563±0.069).osteoealcin (0.819±0.023 vs 0.962±0.049) of MSCs after difierentiation in the SLE group was decreased than that of the control group.There was no significant difference in the expression of PPARγ2 mRNA between SLE and controI group (0.421±0.052 vs 0.441±0.012).Conelusion MSCs from SLE have abnormalities in osteogenie and adipogenic differentiation potential.