Tfh細胞和B細胞共培養(yǎng)體系與HepG2.2.15細胞相互作用研究
發(fā)布時間:2018-04-03 17:37
本文選題:免疫磁珠分離 切入點:B細胞 出處:《重慶醫(yī)科大學》2012年碩士論文
【摘要】:目前在全球范圍內(nèi),感染乙型肝炎病毒的人大約有20億,我國約有9300萬人。乙型肝炎病毒嚴重威脅著人類的健康。慢性乙型肝炎的治療目前仍然缺乏行之有效的辦法和藥物。HBV病毒本身不直接破壞肝臟細胞,而肝細胞的損傷主要是由于機體為了清除感染了HBV的肝細胞的免疫反應導致【1】。因此,從免疫學的角度對慢性乙型肝炎的研究仍然具有重要意義。 目的 以細胞膜受體CXCR5為共同抗原標志,應用免疫磁珠分選法建立Tfh細胞和B細胞共培養(yǎng)體系,在成功構(gòu)建共培養(yǎng)體系的基礎上體外觀察培養(yǎng)體系與人肝癌細胞系HepG2.2.15細胞混合培養(yǎng)前后共刺激因子的變化。為進一步體外研究細胞之間的相互關系奠定基礎。 方法 1.研究對象:慢性乙型肝炎肝硬化行脾切除術(shù)患者15例(男8,女7); 2.流式細胞儀檢測:獲取慢性乙型肝炎肝硬化行脾切除術(shù)患者術(shù)前外周血20ml,術(shù)中取脾臟組織10g左右,分離獲得淋巴細胞,以相應的抗體標記,以流式細胞儀檢測外周血來源與脾臟來源的Tfh細胞表型; 3.以免疫磁珠方法構(gòu)建Tfh細胞和B細胞共培養(yǎng)體系:采用梯度離心法分離15例慢性乙肝病毒感染者脾臟單個核細胞(PBMC),以細胞膜受體CXCR5為抗原標志,采用免疫磁珠分選法分離CXCR5+細胞,通過流式細胞儀檢測CXCR5+細胞純度和組成; 4.混合培養(yǎng):將CXCR5+細胞和人肝癌細胞系HepG2.2.15細胞在體外混合培養(yǎng)1周; 5.流式細胞儀檢測:CXCR5+細胞和人肝癌細胞系HepG2.2.15細胞在體外混合培養(yǎng)1周后,應用流式細胞儀檢測Tfh細胞表型變化; 6.混合培養(yǎng)液上清檢測:混合培養(yǎng)1周后,應用ELISA法檢測培養(yǎng)上清液HBeAb; 7.混合培養(yǎng)液上清HBV DNA水平測定:將收集的上清液經(jīng)DNA提取液處理后進行PCR擴增,按照HBV DNA熒光定量PCR檢測試劑盒操作步驟進行。 8.混合培養(yǎng)細胞CXCR5mRNA水平測定:(1)提取總RNA:按照高純總RNA快速提取試劑盒說明書進行。(2)合成cDNA:以每10ul反應體系400ng總RNA按逆轉(zhuǎn)錄試劑盒說明書進行合成。(3) PCR擴增: CXCR5引物: F:5-CTCCTCTCCATCCACATCACCT-3,R:5-CGTTTCTGCTTGGTTCTCTTGG-3。反應條件為:95℃30S;95℃5S,60℃31S,40個循環(huán)。2-△△CT方法分析基因表達水平,B-actin為內(nèi)參。 9.統(tǒng)計學方法:用SPSS17.0軟件進行分析,采用t檢驗和方差分析,以P0.05為差異有統(tǒng)計學意義。 結(jié)果 1.同一患者外周血來源的Tfh細胞和脾臟來源的Tfh細胞表型存在差異。外周血來源的Tfh細胞ICOS,PDL1,PDL1表達低于脾臟Tfh細胞,差異具有統(tǒng)計學意義(P0.05),而CCR7表達高于脾臟Tfh細胞,差異具有統(tǒng)計學意義(P0.05); 2.同一患者外周血來源的Tfh細胞分泌的細胞因子IFN-γ(8.32±1.21)明顯高于脾臟來源的Tfh細胞分泌IFN-γ(3.83±0.32),差異具有統(tǒng)計學意義(P0.05); 3.應用磁珠分選法能夠成功獲得CXCR5+細胞:用流式細胞儀鑒定細胞的純度和構(gòu)成:CXCR5+細胞純度為85.53±5.77%,其中tfh細胞占:23.8±7.4%,B細胞占:35.6±7.6%; 4.CXCR5+細胞和人肝癌細胞系HepG2.2.15細胞在體外混合培養(yǎng)1周后,應用流式細胞儀檢測Tfh細胞表型的變化,發(fā)現(xiàn)PD1, PDL1,ICOS均明顯低于培養(yǎng)前,差異具有統(tǒng)計學意義(P0.05)。Tfh細胞分泌因子IFN-γ的表達情況也明顯高于培養(yǎng)前,差異具有統(tǒng)計學意義CCR7在培養(yǎng)后明顯高于培養(yǎng)前和外周血來源的Tfh細胞的表達量,,差異具有統(tǒng)計學意義(P0.05); 5.混合培養(yǎng)1周后上清液HBeAb定量檢測結(jié)果,實驗組HBeAb(0.768±0.094)均高于空白對照組HBeAb(0.478±0.088),差異具有統(tǒng)計學意義; 6.混合培養(yǎng)液上清HBV-DNA定量檢測結(jié)果:實驗組HBV-DNA檢測結(jié)果明顯低于空白對照組,HBV-DNA抑制率為33%; 7.將CXCR5+細胞和人肝癌細胞系HepG2.2.15細胞在體外混合培養(yǎng)1周后,檢測CXCR5+細胞表面CXCR5mRNA的表達情況,實驗組和空白對照組相比無顯著差異。 結(jié)論 1.脾臟來源的Tfh細胞和外周血來源的Tfh細胞共刺激分子表達存在差異,CXCR5+細胞和人肝癌細胞系HepG2.2.15細胞混合培養(yǎng)后發(fā)現(xiàn)脾臟來源的Tfh細胞細胞表型有向外周血來源的Tfh細胞表型轉(zhuǎn)變的趨勢; 2.使用間接免疫磁珠分離法可成功建立CXCR5+B淋巴細胞和Tfh細胞的共培養(yǎng)體系,為進一步體外研究細胞之間相互關系奠定基礎。 3.CXCR5+細胞對HBV-DNA的復制具有抑制作用,HBV-DNA抑制率為33%,對HBsAg,HBeAg也具有抑制作用,通過擴增CXCR5后發(fā)現(xiàn)實驗組和對照組無明顯差異,說明CXCR5+細胞對HBV-DNA復制的影響不是通過高表達CXCR5的途徑來實現(xiàn)的,具體的作用機制有待進一步的研究。
[Abstract]:At present , there are about 2 billion people infected with hepatitis B virus worldwide . There are about 93 million people in our country . Hepatitis B virus is a serious threat to human health . The treatment of chronic hepatitis B is still lack of effective methods and medicines . HBV virus itself does not directly destroy liver cells , and the damage of liver cells is caused by the immune response of liver cells infected with HBV . Therefore , the study of chronic hepatitis B is still of great significance from the perspective of immunology .
Purpose
Based on the successful construction of the co - culture system , the changes of costimulatory factors were observed in the culture system and the human hepatoma cell line HepG2.2 . 15 .
method
1 . Subjects : 15 patients with chronic hepatitis B cirrhosis ( male 8 , female 7 ) ;
2 . Flow cytometry was used to detect the peripheral blood flow in 20 ml of peripheral blood before operation in patients with chronic hepatitis B cirrhosis .
3 . Using immune magnetic bead method to construct the system of the co - culture of T cell and B cells : 15 cases of chronic hepatitis B virus infected with spleen mononuclear cells ( PBMC ) were separated by gradient centrifugation , the cell membrane receptor ' s expression was used as the antigen marker , the cells were separated by immunomagnetic bead sorting method , and the purity and composition were detected by flow cytometry .
4 . mixing culture : carrying out mixing culture for 1 week ;
5 . Flow cytometry was used to detect the phenotype changes of the cell line HepG5 + cells and human hepatoma cell line HepG2.2 . 15 after 1 week in vitro .
6 . supernatant of mixed culture solution : after 1 week of mixed culture , ELISA method was used to test the culture supernatant ;
7 . measuring HBV DNA level on the mixed culture medium : carrying out PCR amplification after the collected supernatant is processed by a DNA extraction solution , and carrying out the operation steps of the kit according to the HBV DNA fluorescence quantitative PCR detection kit .
8 . Assay : ( 1 ) extracting total RNA : ( 1 ) extracting total RNA : ( 1 ) extracting total RNA : ( 2 ) synthesizing cDNA : synthesizing the total RNA of 400ng total RNA in every 10 ul reaction system according to the instructions of reverse transcription kit .
The gene expression level was analyzed by 2 - 鈻
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