Distribution of 1,25-Dihydroxyvitamin D3[22-Oxa] In Vivo Receptor Binding in Adult and Developing Skin

    Walter E. Stumpf, Nobuo Koike, Naohiko Hayakawa, Kazuo Tokuda, Kazuhiro Nishimiya, Junji Hirate, A Okazaki, Kenji Kumaki
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    Studysummary In this study, OCT showed strong nuclear binding in certain skin cells, suggesting similar genomic effects to vitamin D with potential therapeutic benefits due to its lower calcaemic effect. Our plain-language summary of this paper — not a Tressless recommendation.
    In the 1995 study, researchers examined the binding sites of oxa-calcitriol (OCT) in the skin of adult and neonatal rats to explore its potential effects on skin and hair follicle function. They found that OCT had the strongest binding in the outer hair sheaths, with 1.5 to 3.2 times higher binding than in epidermal keratinocytes. The distribution of OCT receptors was similar to that of 1,25-dihydroxyvitamin D3 but differed from estradiol. The study suggests that OCT may influence keratinocyte proliferation, differentiation, hair growth, and sebaceous gland activity, and could have therapeutic applications due to its lower calcaemic effect compared to 1,25-dihydroxyvitamin D3.
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