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1,25-Dihydroxycholecalciferol: Inhibition of Action in Organ-cultured Intestine by Actinomycin D and α-Amanitin

Abstract

THE stimulatory action of vitamin D on intestinal calcium absorption has been much studied following the pioneering work of Nicolaysen1 and several important features of the mechanism are fairly well established2. Doubt concerning the chemical identity of the biologically active form of vitamin D has arisen, however, leading to extensive investigations of this aspect3–5. Two important proposals arose out of this work; first, vitamin D3 (cholecalciferol) must be first converted to 1,25-dihydroxycholecalciferol (1,25-diOH-CC) (ref. 6) before it can act on the intestine; and second, 1,25-diOH-CC stimulates intestinal calcium transport directly by an actinomycin D-insensitive process6.

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CORRADINO, R. 1,25-Dihydroxycholecalciferol: Inhibition of Action in Organ-cultured Intestine by Actinomycin D and α-Amanitin. Nature 243, 41–43 (1973). https://doi.org/10.1038/243041a0

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