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Gastroenterology:GS-4774联合替诺福韦可增加HBV感染者特性T细胞响应

2019-04-10 MedSci MedSci原创

研究发现接种疫苗可以增加CD8 T细胞在抗原作用下产生的IFNG、TNF和IL2的能力。虽然GS-4774不能降低患者HBsAg水平,但其对CD8 T细胞的强免疫刺激作用可能与其他抗病毒药物联合应用,提高抗病毒免疫应答

增加病毒特异性T细胞功能是一种治疗慢性乙型肝炎病毒(HBV)感染的策略。近日研究人员考察了HBV抗原疫苗GS-4774联合替诺福韦酯(TDF)治疗慢性HBV感染患者的疗效。

HB表面抗原(HBsAg)阳性且超过6个月 HBV DNA水平≥2000 IU/ml的患者参与研究,3个月内未接受过抗病毒治疗,患者随机接受单纯口服300mg TDF每日一次(n=27;对照)或联合2、10或40个酵母单位GS-4774(n=168),每4周皮下注射一次,至第20周,共6次。研究的疗效终点为24周HBsAg变化。检测12例D型HBeAg阴性患者外周血评估HBV的特异性应答(评估IFNG、TNF、IL2和病毒脱粒)。

研究发现GS-4774耐受性好,但HBsAg水平没有明显下降。与基线相比,干扰素γ(IFNG)、肿瘤坏死因子(TNF)和白细胞介素2(IL2)在第24周和第48周大幅度增加,GS 4774组患者HBV特异性CD8 T细胞的产生明显增加。GS-4774对CD8的影响大于CD4 T细胞,TDF与GS-4774作用不明显或对CD4 T细胞的影响很小。GS-4774不影响T细胞对其他病毒的反应。HBV病毒核心诱导T细胞产生最大量的IFNG,而HBV包膜抗原没有引起应答。刺激10天后,IFNG和TNF的产生随GS-4774暴露时间的延长而增加,对HBV包膜抗原的应答达到最大,其次为核心和聚合酶。研究人员观察到在接受GS-4774治疗的患者中,T细胞功能增强与T调节细胞数量减少之间存在相关性。

研究发现接种疫苗可以增加CD8 T细胞在抗原作用下产生的IFNG、TNF和IL2的能力。虽然GS-4774不能降低患者HBsAg水平,但其对CD8 T细胞的强免疫刺激作用可能与其他抗病毒药物联合应用,提高抗病毒免疫应答。

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    2019-09-25 许安
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    2019-10-26 klivis
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    2020-01-11 仁医06
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