Vitamin D and Bone: A Story of Endocrine and Auto/Paracrine Action in Osteoblasts

Marjolein van Driel*, Johannes P T M van Leeuwen

*Corresponding author for this work

Research output: Contribution to journalReview articleAcademicpeer-review

11 Citations (Scopus)
21 Downloads (Pure)

Abstract

Despite its rigid structure, the bone is a dynamic organ, and is highly regulated by endocrine factors. One of the major bone regulatory hormones is vitamin D. Its renal metabolite 1α,25-OH2D3 has both direct and indirect effects on the maintenance of bone structure in health and disease. In this review, we describe the underlying processes that are directed by bone-forming cells, the osteoblasts. During the bone formation process, osteoblasts undergo different stages which play a central role in the signaling pathways that are activated via the vitamin D receptor. Vitamin D is involved in directing the osteoblasts towards proliferation or apoptosis, regulates their differentiation to bone matrix producing cells, and controls the subsequent mineralization of the bone matrix. The stage of differentiation/mineralization in osteoblasts is important for the vitamin D effect on gene transcription and the cellular response, and many genes are uniquely regulated either before or during mineralization. Moreover, osteoblasts contain the complete machinery to metabolize active 1α,25-OH2D3 to ensure a direct local effect. The enzyme 1α-hydroxylase ( CYP27B1) that synthesizes the active 1α,25-OH2D3 metabolite is functional in osteoblasts, as well as the enzyme 24-hydroxylase ( CYP24A1) that degrades 1α,25-OH2D3. This shows that in the past 100 years of vitamin D research, 1α,25-OH2D3 has evolved from an endocrine regulator into an autocrine/paracrine regulator of osteoblasts and bone formation.

Original languageEnglish
Article number480
JournalNutrients
Volume15
Issue number3
DOIs
Publication statusPublished - Feb 2023

Bibliographical note

Funding Information:
This review received no external funding.

Publisher Copyright:
© 2023 by the authors.

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