Background:

Impurity of Alfacalcidol. Alfacalcidol (1-hydroxycholecalciferol; Alpha D3; 1.alpha.-Hydroxyvitamin D3) is a non-selective VDR activator medication. IC50 value: Target: VDR activatorAlfacalcidol (1-hydroxycholecalciferol; Alpha D3; 1.alpha.-Hydroxyvitamin D3) improves mechanical bone strength and bone mass; suppresses osteoclastic bone resorption in vivo.

参考文献:
[1]. Shiraishi et al (2000) Alfacalcidol inhibits bone resorption and stmulates formation in an ovariectomized rat model of osteoporosis: Distinct actions from estrogen. Journal of Bone and Mineral Research. 15 770.
[2]. Ringe JD, Schacht E. et al. Prevention and therapy of osteoporosis: the roles of plain vitamin D and alfacalcidol. Rheumatol Int. 2004 Jul;24(4):189-97.
[3]. Ivarsen P, Povlsen JV, Christensen KL.Effect of alfacalcidol on cardiac function in patients with chronic kidney disease stage 4 and secondary hyperparathyroidism: A pilot study.Scand J Urol Nephrol. 2012 Jun 25.
[4]. Rianthavorn P, Pisutikul K, Deekajorndech T, Tepmongkol S, Suphapeetiporn K.Prevention of bone loss in children receiving long-term glucocorticoids with calcium and alfacalcidol or menatetrenone.J Pediatr Endocrinol Metab. 2012;25(3-4):307-12.