视黄酸对幼儿淋巴结B细胞发育的影响

目的:研究视黄酸在B细胞分化发育中的作用,探讨维生素A增加抗体产生的机制。方法:取幼儿正常淋巴结细胞体外培养,加入视黄酸或视黄酸受体拮抗剂干预前后,采用流式细胞术检测分析细胞表面标志的变化,观察B细胞的成熟分化。结果:体外培养的幼儿淋巴结B细胞在无刺激剂存在时,CD19+IgM+的成熟B细胞百分比随培养时间逐渐增加,而相对不成熟的CD19+IgM-B细胞百分比逐渐减少,以48h明显(P<0.05);体外培养加入视黄酸可使CD19+IgM+B细胞百分比进一步升高,在培养24h和48h均显著高于对照组(P均<0.05);同时加入视黄酸拮抗剂则能完全拮抗该促进作用。结论:视黄酸通过视黄酸受体介导促进体外培养的淋巴结B细胞的分化发育。

THE INFLUENCE OF RETINOIC ACID ON THE DEVELOPMENT OF LYMPH NODE B CELLS IN CHILDREN

Objective: To investigate the effect of retinoic acid on the differentiation and development of B lymphocytes, and explore the mechanism of vitaminA in increasing the production of antibodies. Method: In vitro cultured cells from children’s normal mesentery lymph nodes, before and after administration of retinoic acid or retinoic acid antagonist, the changes of cell surface markers were analyzed by flowcytometry to observe the differentiation and maturation of B cells. Results: During culture in vitro, the percent of mature CD19+IgM+ B cells increased and relatively immature CD19+IgM- B cells decreased gradually, and the changes were especially obvious at 48 h. The administration of retinoic acid further increased the percent of CD19+IgM+ B cells, and the enhancement was markedly at 24 and 48 h (P<0.05). However, when the retinoic acid antagonist was added to the culture, the promotion effect of retinoic acid was completely counteracted. Conclusion: Retinoic acid promoted the differentiation and development of B cells, from lymph node when cultured in vitro. The effect was mediated by retinoic acid receptors.