一、维甲酸类的功能表达机制天然维甲酸类(retinoid)有视黄醇(retinol)(醇型)和视黄酸(retinoic acid)(碳酸型)等,前者为血中所输送的分子种系,而后者乃视黄醇在靶细胞内被氧化所形成的活性型。从视黄酸与核内受体结合而抑制转录看来,它被认作为相当于类固醇激素的生理活性物质 First, the retinoid function of the expression mechanism of natural retinoids (retinol) (alcohol type) and retinoic acid (retinoic acid) (carbonic acid type), the former is the molecular species of blood The latter is the active form of retinol that is oxidized within the target cell. From the view that retinoic acid binds to nuclear receptors and inhibits transcription, it is considered as a physiologically active substance equivalent to steroid hormone