Vitamin D receptor and Retinoic acid receptor signaling pathway (VDR-RAR signaling) (VDR-RAR signaling)

The VDR–RAR shared nuclear signaling pathway represents the integrated transcriptional control exerted by the Vitamin D Receptor (VDR) and the Retinoic Acid Receptor (RAR). Both receptors are members of the nuclear hormone receptor superfamily and function as ligand-activated transcription factors that typically heterodimerize with the Retinoid X Receptor (RXR) to regulate gene expression [PMID: 1321494]. This shared signaling network is characterized by significant crosstalk, as VDR and RAR often compete for the limited intracellular pool of RXR and common co-regulators, which can lead to synergistic or antagonistic physiological effects depending on the cellular context [PMID: 7512024]. Biologically, this pathway is essential for maintaining calcium homeostasis, promoting cellular differentiation, and modulating immune responses, particularly within the skin and hematopoietic systems [PMID: 15556564]. Dysregulation of VDR–RAR signaling is implicated in various pathologies, including hyperproliferative skin disorders like psoriasis, metabolic bone diseases, and several malignancies such as acute promyelocytic leukemia [Source: NIH/StatPearls]. Pharmacological targeting involves the use of vitamin D analogs and retinoids, which are frequently utilized in clinical practice to treat dermatological conditions and certain cancers by inducing cell cycle arrest and differentiation [Source: PubChem]. However, therapeutic application is often limited by systemic safety concerns, most notably the risk of hypercalcemia associated with VDR activation and the potent teratogenic effects of RAR ligands [Source: FDA Labels].

Other names

VDR-RAR crosstalkVitamin D and Retinoid signalingVDR/RAR/RXR signaling complexNuclear receptor crosstalk

Ligand-induced heterodimerization with Retinoid X Receptor (RXR) followed by binding to Vitamin D Response Elements (VDRE) or Retinoic Acid Response Elements (RARE) to modulate gene transcription.