【摘要】 目的:探讨瘦素(Leptin)对人外周血T淋巴细胞增殖作用的影响。方法:分离并培养人外周血T淋巴细胞,采用[3H]TdR掺入试验方法,观察不同浓度Leptin的单独作用及其与PHA的协同作用对人外周血T淋巴细胞增殖作用的影响。结果:不同浓度Leptin的单独作用对人类外周血T淋巴细胞均无刺激增殖作用,但可协同PHA的刺激增殖作用,并在一定浓度范围内呈现剂量依赖性。结论:瘦素可协同PHA刺激人类外周血T淋巴细胞增殖。更多还原

【Abstract】 Objective:To investigate the effect of human Leptin on the proliferation of human circulating T lymphocytes in vitro and the influence of Leptin on the action of PHA on the proliferation of human circulating T lymphocytes.Methods:PBMC were isolated from hepartinized venous blood of normal donors by density-gradient sedimentation over Ficoll-Hypaque and cultured in the 1640 complete medium.T lymphocytes were then obtained by depleting the monocyte and B cell populations.Cells were then cultured in the 1640 complete medium for 56 h in the presence of PHA.The proliferative effect was assessed by means of incorporation of thymidine.TdR was added and cultured for 16 hours.Cells were then processed in the harvester to measure the incorporation of [()~3H] thymidine.Radioactivity was determined by liquid scintillation counter.Results:The results showed that Leptin alone did not affect the proliferation of T lymphocytes,but it could enhance the effect of PHA on the proliferation of T lymphocytes at the concentrations of PHA from 2-8 μg/ml.A dose-response studies of T lymphocyte proliferation showed that the maximal effect of Leptin were observed at 10 nmol/L.Leptin did not affect the proliferation of T lymphocytes when the concentrations of PHA were over 8 μg/ml.Conclusion:The studies demonstrated that Leptin alone did not affect the proliferation of lymphocytes,but it could enhance the action of PHA on cell growth in a dose-dependent manner.更多还原