3-epi-vitamin d3

3-epi-Vitamin D3 (Epicholecalciferol) 是维生素 D3 类似物，是一种Hedgehogpathway 抑制剂，在U87MG 细胞中测定的IC50为 39.2 μM。

1α-Hydroxy-3-epi-vitamin D3, a natural metabolite derived from 1alpha,25-dihydroxyvitamin D3, effectively suppresses parathyroid hormone (PTH) secretion[1].

3-epi-25-hydroxy Vitamin D3is the C-3 epimer of 25-hydroxy vitamin D3.1Dietary administration of 3-epi-25-hydroxy vitamin D3(0.5 and 1 IU/g) decreases levels of serum parathyroid hormone (PTH) in male, but not female, weanling rats. 1.Djekic-Ivankovic, M., Lavery, P., Agellon, S., et al.The C-3α epimer of 25-hydroxycholecalciferol from endogenous and exogenous sources supports normal growth and bone mineral density in weanling ratsJ. Nutr.147(2)141-151(2017)

(1S)-Calcitriol (1α,25-Dihydroxy-3-epi-vitamin-D3) is a natural metabolite of 1α,25-dihydroxyvitamin D3 (1α,25(OH)2D3). (1S)-Calcitriol exhibits potent vitamin D receptor (VDR)-mediated actions such as inhibition of keratinocyte growth or suppression of parathyroid hormone secretion[1]. 3‐epi‐Calcitroic acid is an end product of (1S)-Calcitriol (1α,25-Dihydroxy-3-epi-vitamin-D3; 3‐epi‐1a,25(OH)2D3) metabolism by rat CYP24A1[1]. [1]. Steve Y Rhieu, et al. Metabolic stability of 3-epi-1α,25-dihydroxyvitamin D3 over 1 α 25-dihydroxyvitamin D3: metabolism and molecular docking studies using rat CYP24A1. J Cell Biochem. 2013 Oct;114(10):2293-305.

3-epi-25-hydroxy Vitamin D3 (Standard) 是一种可用于分析的标准物质，通常用作 3-epi-25-hydroxy Vitamin D3 的研究和分析中参考的标准样品。3-epi-25-hydroxy Vitamin D3 是 25-羟基维生素 D3 的 C-3 极化异构体。通过饮食方式给予 3-异构体-25-羟基维生素 D3（0.5 和 1 国际单位/克），能够降低幼年雄性大鼠的血清甲状旁腺激素（PTH）水平，但对雌性幼年大鼠则无此效果。