Recent Developments of 19‐Nor‐1,25‐dihydroxyvitamin D₃ Analogues

Abstract

The vitamin D hormone, 1α,25-dihydroxyvitamin D3 [1,25-(OH)2 D3 ], exerts its hormonal effects predominantly on intestine, bone, and kidney, where it plays a crucial role in calcium and phosphorus homeostasis and bone mineralization. In addition to its classical actions, 1,25(OH)2 D3 exerts pleiotropic effects in a wide variety of target tissues and cell types, often in an autocrine/paracrine fashion. These biological activities of 1,25(OH)2 D3 have suggested a multitude of potential therapeutic applications for the vitamin D hormone in the treatment of hyperproliferative disorders (e.g. cancer and psoriasis), immune dysfunction (autoimmune diseases), and endocrine disorders (e.g. hyperparathyroidism). However, the calcemic effects induced by 1,25(OH)2 D3--hypercalcemia, increased bone resorption, and soft tissue calcification--limit the use of the natural ligand in these clinical applications. Therefore, numerous 1,25(OH)2 D3 analogues have been synthesized with the intent of producing therapeutic agents devoid of hypercalcemic and hyperphosphatemic side effects. To this aim, much attention has been focused on the development of 19-nor-vitamin D3 derivatives that lack the ring-A exocyclic methylene group (C19). In this review, the 19-nor-1,25(OH)2 D3 analogues are classified according to modifications made at the A-ring, the side chain, or both the A-ring and side chain, as well as other positions. The biological activities of these 19-nor-1,25(OH)2 D3 analogues are summarized and their structure-activity relationships and binding features with the vitamin D receptor (VDR) are discussed.

The human cytomegalovirus lytic cycle is induced by 1,25-dihydroxyvitamin D3 in peripheral blood monocytes and in the THP-1 monocytic cell line

“…It is therefore not surprising that 1,25-dihydroxyvitamin D3 has been demonstrated to exhibit antibacterial and antiviral effects (Korf, Decallonne, and Mathieu, 2014; Luong and Nguyen, 2011; Maxwell, Carbone, and Wood, 2012; Spector, 2011). The importance of 1,25-dihydroxyvitamin D3 in regulation of immune system function has been further highlighted by studies which suggest that 1,25-dihydroxyvitamin D3 or synthetic analogues of 1,25-dihydroxyvitamin D3 could be used as potent candidates for the treatment for autoimmune diseases, infectious diseases and anticancer therapies (Salomon et al, 2014; Yuzefpolskiy et al, 2014; Zhang, Wan, and Liu, 2013). Nonetheless, the effect of 1,25-dihydroxyvitamin D3 on HCMV replication in monocytes and macrophages remains unknown.…”