calcitriol

Calcitriol (1,25-Dihydroxyvitamin D3) 是一种维他命 D 的代谢物，一种维他命 D 受体 (VDR) 的激动剂 (IC50=0.4 nM)。Calcitriol 增加肠道对钙和磷的吸收，并与甲状旁腺激素一起增加了骨吸收。

(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.

Impurity B of Calcitriol is an impurity of Calcitriol. Calcitriol is the hormonally active form of vitamin D, Calcitriol is the active metabolite of vitamin D3 that activates the vitamin D receptor (VDR).

Calcitriol Impurities A refers to the contaminants found in Calcitriol, the hormonally active metabolite of vitamin D3, which serves to activate the vitamin D receptor.

Calcitriol lactone (1α,25-Dihydroxyvitamin D3-26,23-lactone)，一种维生素D3的代谢产物，作为维生素D的活性形态，对骨骼健康、细胞分化及免疫功能具有重要影响。

Calcitriol D6 is the deuterated form of Calcitriol, which is the hormonally active form of vitamin D. Calcitriol is the active metabolite of vitamin D3 that activates the vitamin D receptor.

Impurity C of Calcitriol是 Calcitriol 的杂质。Impurity C of Calcitriol 可用于合成维生素D3。

Calcitriol Derivatives is an analog of vitamin D3.

Calcitriol Impurities D (24-Homo Calcitriol) 是维生素的一种激素形式，可促进HL-60人早幼粒细胞白血病细胞分化为单核细胞。Calcitriol Impurities D 具有骨吸收活性，抑制人类免疫缺陷病毒在人体细胞中的复制。Calcitriol Impurities D 具有抗病毒活性们可以用于治疗艾滋病和病毒感染。

Falecalcitriol is an analog of calcitriol. It has a higher potency both in vivo and in vitro systems, which is longer duration of action in vivo.

Ercalcitriol (1α,25-Dihydroxy Vitamin D2) 是维生素 D2 的活性代谢物。 Ercalcitriol 作为维生素 D 的生理活化形式，通过调节正常细胞和转化细胞中的导管素抗菌肽 (CAMP) 和防御素 β-4 (DEFB4) 基因来增强免疫力，从而对抗病原体感染。

Maxacalcitol (22-Oxacalcitriol) 是非血钙维生素 D3的一种类似物，是 VDR 样受体的配体。

Elocalcitol is a calcitriol analog for inhibition of prostate cell growth.

Tpl2 kinase inhibitor is an inhibitor of tumor progression locus 2 (Tpl2; IC50= 0.05 μM).1It is selective for Tpl2 over MEK, p38 MAPK, Src, MK2, and PKC (IC50s = >40, 180, >400, 110, and >400 μM, respectively). Tpl2 kinase inhibitor inhibits LPS-induced TNF-α production in isolated human monocytes and whole blood (IC50s = 0.7 and 8.5 μM, respectively). It enhances differentiation induced by calcitriol in HL-60 and U937 leukemia cells when used at a concentration of 5 μM.2Tpl2 kinase inhibitor (5 μM) inhibits the proliferation of KG-1a leukemia cells.3 1.Garvin, L.K., Green, N., Hu, Y., et al.Inhibition of Tpl2 kinase and TNF-α production with 1,7-naphthyridine-3-carbonitriles: Synthesis and structure-activity relationshipsBioor. Med. Chem. Lett.15(23)5288-5292(2005) 2.Wang, X., and Studzinski, G.P.Expression of MAP3 kinase COT1 is up-regulated by 1,25-dihydroxyvitamin D3 in parallel with activated c-jun during differentiation of human myeloid leukemia cellsJ. Steroid. Biochem. Mol. Biol.121(1-2)395-398(2010) 3.Wang, X., Gocek, E., Novik, V., et al.Inhibition of Cot1/Tlp2 oncogene in AML cells reduces ERK5 activation and up-regulates p27Kip1 concomitant with enhancement of differentiation and cell cycle arrest induced by silibinin and 1,25-dihydroxyvitamin D3Cell Cycle9(22)4542-4551(2010)