The circadian clock system orchestrates daily behavioral and physiological rhythms, facilitating adaptation to environmental and internal oscillations. Disruptions in circadian rhythms have been linked to increased susceptibility to various diseases and can exacerbate existing conditions. This review delves into the intricate regulation of diurnal gene expression and cell function by circadian clocks across diverse tissues. . Specifically, we explore the rhythmicity of gene expressions, behaviors, and functions in both immune and non‐immune cells, elucidating the regulatory effects and mechanisms imposed by circadian clocks. A detailed discussion is centered on elucidating the complex functions of circadian clocks in regulating key cellular signaling pathways. We further review the circadian regulation in diverse diseases, with a focus on inflammatory diseases, cancers, and systemic diseases. By highlighting the intimate interplay between circadian clocks and diseases, especially through clock‐controlled cell function, this review contributes to the development of novel disease intervention strategies. This enhanced understanding holds significant promise for the design of targeted therapies that can exploit the circadian regulation mechanisms for improved treatment efficacy.
Nuclear receptors (NRs) are a superfamily of ligand-dependent transcription factors that serve as pivotal regulators of gene expression in response to hormonal, metabolic, and environmental cues. They exert transcriptional control through complex interactions with co-regulators, thereby influencing gene networks involved in metabolic regulation, cell signaling, immune modulation, and homeostatic maintenance. Dysregulation of NR activity has been implicated in the pathogenesis of various metabolic and inflammatory conditions through altered gene expression and signaling cascades. This review provides an integrated overview of NR structural features and classification, elucidates their mechanisms of action in gene regulation and metabolic balance, and explores their dual roles in both physiological and pathological contexts. We further examine recent advances in NR-targeted drug discovery, including structure-based drug design, chemical biology approaches, and AI-assisted ligand development. Finally, we highlight multidisciplinary perspectives and emerging directions for NR research within the framework of precision medicine.