25(OH)D3 stimulates the expression of vitamin D target genes in renal tubular cells when Cyp27b1 is abrogated.
Kikuyama T, Susa T, Tamamori-Adachi M, Iizuka M, Akimoto M, Okinaga H, Fujigaki Y, Uchida S, Shibata S, Okazaki T.
J Steroid Biochem Mol Biol. 2020 May;199:105593.