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Introduction Cellular senescence is a conserved stress response characterized by durable cell-cycle arrest, chromatin remodeling, and a pro-inflammatory secretome commonly termed the senescence-associated secretory phenotype (SASP). Accumulation of senescent cells has...

Introduction Nicotinamide N-methyltransferase (NNMT) is a cytosolic enzyme involved in critical methylation reactions that influence energy metabolism, detoxification, and cellular homeostasis. This enzyme catalyzes the transfer of a methyl group from...

Introduction The gastrointestinal system serves as one of the body’s most intricate immune environments, containing a vast network of lymphoid tissues and symbiotic microorganisms that together orchestrate immune balance. Approximately 70% of immune-related cells...

Introduction Gonadal function is coordinated by a hierarchical axis in which hypothalamic peptides modulate pituitary output and, in turn, regulate steroidogenic and gametogenic programs in the gonads. Two widely studied ligands in this network are the decapeptide...

Introduction Growth hormone secretagogue receptor (GHSR) agonists are widely used in laboratory models to probe the physiology of the somatotropic axis and its crosstalk with neural circuits that regulate energy balance, stress responses, and cognition. Two frequently...

Introduction Peptide-based agents offer precise interactions with biological targets, yet most exhibit low exposure after oral administration. This constraint arises from a convergence of physicochemical and physiological barriers that limit transit across the...

Introduction Glomerular filtration depends on the coordinated function of endothelial cells, the glomerular basement membrane, and podocytes whose interdigitating foot processes form slit diaphragms. Disruption of podocyte architecture—particularly alterations in...

Introduction Reactive oxygen and nitrogen species are continuously generated as by-products of metabolism and environmental stressors, imposing a persistent oxidative load on cellular macromolecules. If left unmanaged, these oxidants disrupt protein structure, damage...

Introduction Mitochondria orchestrate cellular energy conversion, redox signaling, and apoptosis through a coordinated network of membranes, protein complexes, and nucleic acids. Their bioenergetic output—chiefly ATP generated via oxidative phosphorylation—depends on...

Introduction Cognition emerges from distributed neural circuits that integrate synaptic plasticity, neuromodulation, and structural remodeling. At the molecular level, transient changes in presynaptic release probability and postsynaptic receptor function—ranging from...

Introduction Neurodegenerative processes are frequently associated with the progressive loss of dopaminergic neurons, impaired neurogenesis, and dysregulation of trophic signaling networks in the central nervous system (CNS). Among the molecular systems implicated in...

Introduction Vasoactive peptide systems shape vascular tone, organ perfusion, extracellular matrix turnover, and stress-adaptive signaling through G-protein–coupled receptors (GPCRs). Within this landscape, the relaxin family peptide receptor 1 (RXFP1) has attracted...

Introduction Peptide-like molecules and selective receptor modulators continue to attract interest in experimental physiology for their capacity to regulate anabolic pathways and tissue remodeling. Among these, MK-677 (Ibutamoren) and MK-2866 (Ostarine) have emerged...

Introduction Skeletal muscle size and function are governed by a balance between anabolic and catabolic cues that converge on the transforming growth factor-β (TGF-β) superfamily. Within this network, myostatin and activins act as dominant negative regulators of...

Introduction Peptides represent a structurally diverse and functionally versatile class of biomolecules central to nearly every form of biological signaling. Defined as short chains of amino acids linked by peptide bonds, they bridge the gap between small-molecule...

Introduction Vascular contributions to cognitive impairment are frequently modeled as a continuum of neurobiological processes initiated by disrupted cerebral perfusion. In experimental settings, transient or chronic hypoperfusion, microinfarction, endothelial...