摘要
背景:脂肪干细胞可以向成骨细胞和软骨细胞、平滑肌细胞、心肌细胞和神经细胞等分化。脂肪源性干细胞与间充质干细胞不但具有非常近似的生物学性质,而且在细胞表面标志谱的表达方面也十分接近。目的:探索脂肪源性干细胞表面白细胞抗原Ⅱ类分子的表达以及其免疫原性和免疫调节作用,并探讨其具体机制是通过什么途径诱导的。方法:分离培养脂肪源性干细胞,并用γ型干扰素刺激,然后用流式细胞术检测其表面免疫分子白细胞抗原Ⅱ的表达,实时荧光定量PCR和Western bolt分别检测吲哚胺-2,3-双加氧酶基因和蛋白的表达。脂肪源性干细胞单向刺激淋巴细胞,观察细胞增殖情况。淋巴细胞用植物血凝素刺激后,加入1×102-1×105脂肪源性干细胞,观察淋巴细胞增殖情况;同时,1×102-1×105脂肪源性干细胞作为"第三者"细胞加入混合双向淋巴细胞反应体系中,同样观察淋巴细胞增殖情况。结果与结论:脂肪干细胞低表达白细胞抗原Ⅱ和吲哚胺-2,3-双加氧酶,但在γ型干扰素刺激后,白细胞抗原Ⅱ和吲哚胺-2,3-双加氧酶表达均明显上调。脂肪源性干细胞不能刺激淋巴细胞增殖,但能抑制植物血凝素或异体淋巴细胞导致的淋巴细胞增殖,且脂肪源性干细胞与混合淋巴细胞共培养的上清中检测到大量γ型干扰素的表达。提示脂肪干细胞具有低免疫原性,同时可在体外抑制淋巴细胞增殖反应,添加外源性γ型干扰素有助于脂肪源性干细胞发挥免疫抑制作用。
BACKGROUND：Adipose stem cells can differentiate into bone cells, cartilage cells, smooth muscle cells, myocardial cells and nerve cells. Adipose-derived stem cells and mesenchymal stem cells have very similar biological properties, and they are also very close in terms of cellsurface marker expression profile. OBJECTIVE：To investigate the expression of human leukocyte antigen II in adipose-derived stem cells and its immunogenicity and immunomodulatory effect, and to explore the specific mechanism. METHODS：After isolation and culture, the adipose-derived stem cells were stimulated with interferon-γ, and the expression of human leukocyte antigen II was detected by flow cytometry, the expression of indoleamine 2,3-dioxygenase was determined by real-time PCR and western blot. Adipose-derived stem cells were used to stimulate lymphocytes, and the cellproliferation was observed. The lymphocytes were stimulated with phytohemagglutinin, and then 1×102-1×105 adipose-derived stem cells were added to inhibit the proliferation;meanwhile, adipose-derived stem cells, a third party, at a dose of 1×102-1×105 were added to the ongoing two-way mixed lymphocyte reaction, and the cellnumber was calculated as count per minute. RESULTS AND CONCLUSION：The expression of human leukocyte antigen II and indoleamine 2,3-dioxygenase was low in adipose-derived stem cells, but up-regulated with stimulation of interferon-γ. Adipose-derived stem cells could not stimulate lymphocyte proliferation, but could inhibit lymphocyte proliferation induced by phytohemagglutinin or al ogeneic lymphocytes, and interferon-γwas highly expressed in the supernatant of co-culture of adipose-derived stem cells and mixed lymphocytes. These results indicate that the adipose-derived stem cells have low immunogenicity and can inhibit cellproliferation of lymphocytes in vitro, and the addition of exogenous interferon-γcan enhance the immunosuppressive effects of adipose-derived stem cells.
出处
《中国组织工程研究》
CAS
CSCD
2014年第32期5120-5125,共6页
Chinese Journal of Tissue Engineering Research
基金
新疆医科大学第一附属医院组织工程专项项目(201022GC02)
新疆维吾尔自治区自然科学基金资助项目(2014211C036)
国家临床重点专科-普通外科专业建设项目~~
