抗CD20單克隆抗體在預防小鼠皮膚移植急性體液性排異反應中的作用
發(fā)布時間:2018-07-09 23:20
本文選題:抗CD20單克隆抗體 + B淋巴細胞。 參考:《吉林大學》2012年碩士論文
【摘要】:目的:本實驗探討抗CD20單克隆抗體在小鼠皮膚移植模型中如何預防急性體液性排異反應。目前研究證實,T淋巴細胞在急性體液性排異反應中起主導作用,而B淋巴細胞及其成熟漿細胞產(chǎn)生的抗體參與了體液性排異反應的發(fā)生。由于免疫抑制劑高效性和臨床應用的廣泛性,使同種異體腎移植進步顯著,移植物總體存活時間明顯延長,排斥總體發(fā)生率明顯降低。然而,目前臨床上常規(guī)使用的抗增殖類藥物、鈣神經(jīng)蛋白抑制劑及激素主要針對于T淋巴細胞介導的細胞免疫,對體液性免疫抑制作用遠低于對細胞免疫抑制作用[1]。目前應用于臨床的針對B淋巴細胞的藥物較少,如何清除B淋巴細胞,抑制B淋巴細胞在體液性排異反應中發(fā)揮的作用,成為國內(nèi)外移植中心研究的熱點。由B淋巴細胞產(chǎn)生的作為參與體液性排異反應的供體特異性抗體(donor-specific alloantibodies,DSA)將供者的上皮細胞作為攻擊的靶點[2],產(chǎn)生抗體介導的體液性排異反應。因此清除受者體內(nèi)的B淋巴細胞、抗體及DSA成為預防及治療抗體介導的體液性排異反應的焦點。隨著對B淋巴細胞及其作用機制的深入研究證實,CD20抗原分子是表達于前B淋巴細胞及成熟B淋巴細胞表面的跨膜糖蛋白,是參與B淋巴細胞活化以及抗原識別的主要分子?笴D20單克隆抗體與B淋巴細胞表面的CD20分子有較高的親和力,可通過誘導細胞凋亡作用、抗體依賴的細胞介導的細胞毒作用及補體介導的細胞毒作用殺傷B淋巴細胞。因此,CD20單克隆抗體是一類具有獨特生物學作用的生物制劑,在移植抗體介導的體液性排異治療中扮演著重要的角色。 方法:一組受鼠給予供體脾臟細胞懸液腹腔注射,后提取血清經(jīng)鼠尾靜脈注射法注射到另一只受鼠體內(nèi);另一組給予抗CD20單克隆抗體鼠尾靜脈注射。然后建立皮膚移植及血管組織皮下包埋模型,術后觀察移植皮膚存活狀況。應用流式細胞技術檢測鼠尾靜脈注射抗CD20單克隆抗體小鼠B淋巴細胞,并切取移植皮膚及血管組織行組織病理學檢查,進一步研究抗CD20單克隆抗體在抗體介導的體液性排異反應中的作用。 結果: (1)對照組小鼠移植皮片平均存活時間(MST)為11.5天,鼠尾靜脈注射血清組的皮片平均存活時間為9天,鼠尾靜脈注射抗CD20單克隆抗體組的皮片平均存活時間為12.5天。 (2)流式細胞技術檢測鼠尾靜脈注射抗CD20單克隆抗體組脾細胞中B淋巴細胞(B220+)的百分比。與正常小鼠比較,,鼠尾靜脈注射抗CD20單克隆抗體組B淋巴細胞顯著減少,P0.05。 (3)取3組脾臟組織行HE染色病理學檢查。鼠尾靜脈注射血清組較對照組脾臟組織中生發(fā)中心明顯增大,淋巴細胞密集;鼠尾靜脈注射抗CD20單克隆抗體組較對照組脾小體明顯縮小,淋巴細胞明顯減少。 (4)取受體鼠移植皮片及血管組織行HE染色病理學檢查。鼠尾靜脈注射血清組較對照組移植皮片組織和皮下包埋血管組織炎細胞及淋巴細胞浸潤明顯增多,組織結構破壞明顯。血管組織炎癥反應重,部分血管壁機化,血管各層組織破壞嚴重,管腔堵塞。鼠尾靜脈注射抗CD20單克隆抗體組移植皮片組織和皮下包埋血管組織炎細胞及淋巴細胞浸潤明顯少于對照組,組織結構破壞不明顯。血管組織炎癥反應輕,血管各層組較完整,管腔存在。 結論:通過鼠尾靜脈注射抗CD20單克隆抗體組小鼠移植皮片生存時間延長,術前使用抗CD20單克隆抗體能有效預防抗體介導的急性排異反應的發(fā)生。
[Abstract]:Objective : To investigate the effect of anti - CD20 monoclonal antibody on the prevention of acute humoral rejection in mouse skin transplantation model . B - lymphocytes , antibodies and DSA are the main targets for the prevention and treatment of antibody - mediated humoral rejection . As a result , the CD20 monoclonal antibody is a kind of biological agent with unique biological effect , which plays an important role in the humoral rejection therapy mediated by transplantation antibody .
Methods : A group of mice were injected intraperitoneally with the donor spleen cell suspension , and the serum was injected into the other mice via the tail vein injection method .
The effect of anti - CD20 monoclonal antibody on antibody - mediated humoral rejection was investigated .
Results :
( 1 ) The average survival time ( MST ) was 11.5 days in the control group , and the average survival time was 9 days after the tail vein injection . The average survival time of the anti - CD20 monoclonal antibody group was 12.5 days .
( 2 ) The percentage of B lymphocytes ( B220 + ) was detected by flow cytometry in the spleen cells of mouse tail vein anti - CD20 monoclonal antibody group . Compared with normal mice , the anti - CD20 monoclonal antibody group B lymphocytes were significantly decreased in mice tail vein , P0.05 .
( 3 ) HE staining was performed in three groups of spleen tissues .
Compared with control group , the anti - CD20 monoclonal antibody group was significantly reduced in mice tail vein , and the lymphocytes decreased significantly .
( 4 ) HE staining was performed on the skin graft and vascular tissue of the recipient mice . The tissue structure was damaged . The inflammatory response , partial vessel wall movement , tissue destruction in the vascular tissues were significantly smaller than those in the control group . The tissue structure was not clear . The inflammatory reaction of the vascular tissue was mild , the vessel layers were intact , and the lumen was present .
Conclusion : Anti - CD20 monoclonal antibody can be used to prevent antibody - mediated acute rejection by intravenous injection of anti - CD20 monoclonal antibody .
【學位授予單位】:吉林大學
【學位級別】:碩士
【學位授予年份】:2012
【分類號】:R392.4
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