The effects of AAV-TGF beta_1 and AAV-TGF beta_3 on promoting synthesis ofglycosaminoglycan and collagen type II of dedifferentiated rabbit lumbar disc NP cells were studiedin this work.The rabbit lumbar disc NP cells...The effects of AAV-TGF beta_1 and AAV-TGF beta_3 on promoting synthesis ofglycosaminoglycan and collagen type II of dedifferentiated rabbit lumbar disc NP cells were studiedin this work.The rabbit lumbar disc NP cells were isolated and cultured.The earlier and laterdedifferentiated NP cells were established by subculture.The AAV transfection efficiency todedifferentiated NP cells was analyzed with AAV-EGFP in vitro.After dedifferentiated NP cells weretransfected by AAV-TGFp,or AAV-TGF beta_3,their biological effects on promoting synthesis ofglycosaminoglycan or collagen type II were detected and compared by the methods of 35S incorporationor immunoblotting.The experimental results showed that AAV could transfect efficiently the earlierdedifferentiated NP cells,but its transfection rate was shown to be at a low level to the laterdedifferentiated NP cells.Both AAV-TGF beta_1,and AAV-TGF beta_3 could promote the earlierdedifferentiated NP cells to synthesize glycosaminoglycan and collagen type II,and the effect ofAAV-TGFp,was better than that of AAV-TGF beta_3.For the later dedifferentiated NP cells,the AAV-TGFbeta_3 could promote their synthesis,but AAV-TGFp,could slightly inhibit theirsynthesis.Therefore,AAV-TGFp,and AAV-TGF beta_3 could be used for the earlier dedifferentiated NPcells,and the TGF beta_3 could be used as the objective gene for the later dedifferentiated NPcells.展开更多
基因疗法是将基因导入靶细胞内,以纠正缺陷和异常基因引起的疾病的治疗方法。目前,多个基因治疗药物已经进入临床研究阶段或已上市,为癌症、罕见病、神经性疾病等多个领域的疾病治疗带来了希望。基因治疗中最关键的步骤就是如何将外源...基因疗法是将基因导入靶细胞内,以纠正缺陷和异常基因引起的疾病的治疗方法。目前,多个基因治疗药物已经进入临床研究阶段或已上市,为癌症、罕见病、神经性疾病等多个领域的疾病治疗带来了希望。基因治疗中最关键的步骤就是如何将外源基因准确安全地导入宿主细胞。腺相关病毒(adeno-associated virus, AAV)载体是当前最受欢迎的人类基因治疗载体之一,它是唯一能定点整合到人类基因组特定位点的病毒载体。AAV定点整合的位点AAVS1 (the adeno-associated virus site 1)已经被证明是安全的基因整合位点。本实验以Rep蛋白介导基因定点整合至人T淋巴细胞基因组AAVS1位点,随后采用标准曲线定量的方法,对混合细胞克隆AAVS1位点的定点整合率进行定量。实验进行两轮PCR,首先通过常规PCR扩增包含ITR-AAVS1结合位点的序列,然后取标准品和检测样本第一轮PCR产物作为模板,进行第二轮定量PCR。通过本实验中的研究方法可以简单快速地定量分析AAVS1定点整合率。展开更多
基金Supported by the National Natural Science Foundation of China (Grant No. 30271318)
文摘The effects of AAV-TGF beta_1 and AAV-TGF beta_3 on promoting synthesis ofglycosaminoglycan and collagen type II of dedifferentiated rabbit lumbar disc NP cells were studiedin this work.The rabbit lumbar disc NP cells were isolated and cultured.The earlier and laterdedifferentiated NP cells were established by subculture.The AAV transfection efficiency todedifferentiated NP cells was analyzed with AAV-EGFP in vitro.After dedifferentiated NP cells weretransfected by AAV-TGFp,or AAV-TGF beta_3,their biological effects on promoting synthesis ofglycosaminoglycan or collagen type II were detected and compared by the methods of 35S incorporationor immunoblotting.The experimental results showed that AAV could transfect efficiently the earlierdedifferentiated NP cells,but its transfection rate was shown to be at a low level to the laterdedifferentiated NP cells.Both AAV-TGF beta_1,and AAV-TGF beta_3 could promote the earlierdedifferentiated NP cells to synthesize glycosaminoglycan and collagen type II,and the effect ofAAV-TGFp,was better than that of AAV-TGF beta_3.For the later dedifferentiated NP cells,the AAV-TGFbeta_3 could promote their synthesis,but AAV-TGFp,could slightly inhibit theirsynthesis.Therefore,AAV-TGFp,and AAV-TGF beta_3 could be used for the earlier dedifferentiated NPcells,and the TGF beta_3 could be used as the objective gene for the later dedifferentiated NPcells.
文摘基因疗法是将基因导入靶细胞内,以纠正缺陷和异常基因引起的疾病的治疗方法。目前,多个基因治疗药物已经进入临床研究阶段或已上市,为癌症、罕见病、神经性疾病等多个领域的疾病治疗带来了希望。基因治疗中最关键的步骤就是如何将外源基因准确安全地导入宿主细胞。腺相关病毒(adeno-associated virus, AAV)载体是当前最受欢迎的人类基因治疗载体之一,它是唯一能定点整合到人类基因组特定位点的病毒载体。AAV定点整合的位点AAVS1 (the adeno-associated virus site 1)已经被证明是安全的基因整合位点。本实验以Rep蛋白介导基因定点整合至人T淋巴细胞基因组AAVS1位点,随后采用标准曲线定量的方法,对混合细胞克隆AAVS1位点的定点整合率进行定量。实验进行两轮PCR,首先通过常规PCR扩增包含ITR-AAVS1结合位点的序列,然后取标准品和检测样本第一轮PCR产物作为模板,进行第二轮定量PCR。通过本实验中的研究方法可以简单快速地定量分析AAVS1定点整合率。
