[摘要] 目的 觀察骨髓間充質幹細胞誘導異種胰島細胞移植的免疫耐受作用。方法 4周齡SD大鼠作為供體,密度梯度離心法分離間充質幹細胞,膠原酶消化法分離胰島細胞,鏈脲佐菌素製備糖尿病模型BALB/C小鼠25隻。將成模小鼠分為:A組(胰島細胞聯合骨髓間充質幹細胞移植組)10隻,B組(單純胰島細胞移植組)10隻,均經門靜脈注射途徑注入肝髒,C組(對照組)5隻,僅經門靜脈注入等量生理鹽水,比較各組血糖改善情況。結果 兩實驗組均較對照組有顯著差異,其中胰島細胞聯合間充質幹細胞移植組效果優於單純胰島細胞移植組。結論 骨髓間充質幹細胞可以誘導小鼠對大鼠胰島細胞的免疫耐受,延長胰島細胞移植物的存活時間。
[關鍵詞] 胰島細胞移植; 間充質幹細胞; 糖尿病
[中圖分類號] R392.33 [文獻標識碼] A [文章編號] 1673-9701(2010)03-05-03
Combination Transplantation of Rat Islet Cells and Bone Marrow Mesenchymal Stem Cells for Diabetic Mouse
JIA Chenle1 SHANG Zhonghua2 ZHANG Xiaoliang1 WANG Mancang1
1.Department of General Surgery,the Second Clinical Medical College of Shanxi Medical University,Taiyuan 030001,China;2.The Second Affiliated Hospital of Shanxi Medical University,Taiyuan 030001,China
[Abstract] ObjectiveTo observe the immune tolerance of bone marrow mesenchymal stem cells induced xenogenic islet cell transplantation. MethodsWe used 4-week-old SD rats as donors,the centrifugation of mesenchymal stem cells was performed by using density gradient,the separation of islet cells by collagenase digestion,and the preparation of of 25 STZ-diabetic model BALB/C mice with Streptozotocin. The model mice were divided into three groups:group A(combination transplantation of rat islet cells and bone marrow mesenchymal stem cells in10 mice),group B(islet cell transplantation by the portal vein injection into the liver channel in 10 mice)and Group C(control group,normal saline by portal vein injection in 5 mice. The blood glucose improvement in each group was compared. ResultsGroups A and B showed a significant difference compared with Group C,with the effect of Group A superior to that of Group B. ConclusionBone marrow mesenchymal stem cells can induce the immune tolerance of the mice to the rat islet cells and extend the survival time of islet cell graft.
[Key words]Islet cell transplantation; Mesenchymal stem cells; Diabetes
胰島B細胞替代治療是糖尿病治療的理想狀態。目前,胰腺移植供體缺乏,操作複雜,費用昂貴,難以廣泛開展;胰島細胞移植並發症少,技術簡單,經濟安全,易推廣,但就完全脫離胰島素而言,效果尚不如意,而且需要多個供體為一個受體提供細胞,供體的缺乏更加突出。目前,移植排斥反應仍然是胰島移植無法逾越的障礙,絕大多數胰島細胞在移植後的數小時內就被破壞殆盡,一年不依賴胰島素率僅為8%。2000年,加拿大Shapiro等采用Edmonton方案取得連續7例胰島移植的成功,患者不依賴胰島素治療時間長達17個月,被認為是胰島移植發展史上的裏程碑。2006年,Shapiro等總結了嚴格以Edmonton方案為基礎的臨床胰島移植,結果發現,僅有58%的患者取得胰島移植成功,然而,長期隨訪觀察卻發現2年胰島素不依賴率降至31%[1,2]。BMSCs不表達MHCII類分子,不表達或低表達MHCI類分子,異種移植也不會產生免疫排斥反應,而且具有很強的免疫抑製作用。本實驗以BMSCs聯合胰島細胞移植,評價BMSCs對移植胰島細胞的保護作用。