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Introduction Sexual motivation and arousal emerge from distributed neural computations that integrate homeostatic state, reward valuation, and sensory input. A long-standing question in basic neuroendocrinology is how peptidergic signals couple these computations to...

Introduction Coordinating reproductive axis activity with metabolic and environmental inputs requires precise neuroendocrine timing. At the apex of this control sits gonadotropin-releasing hormone (GnRH), whose episodic secretion orchestrates downstream pituitary...

Introduction Nicotinamide adenine dinucleotide (NAD⁺) is a ubiquitous pyridine dinucleotide that emerged historically as a fermentation cofactor and is now recognized as a central hub connecting cellular bioenergetics, genome maintenance, and stress-response...

Introduction Barrier integrity and nutrient handling in the gastrointestinal tract emerge from tightly coordinated conversations between epithelia, immune cells, and the enteric nervous system. Among enteric neuropeptides, vasoactive intestinal peptide (VIP) is of...

Introduction Signal transduction through melanocortin receptors (MC1R–MC5R) coordinates diverse processes including pigment synthesis, energy balance, cardiovascular tone, and neurobehavioral responses. Alpha-melanocyte-stimulating hormone (α-MSH) is an endogenous...

Introduction Energy balance emerges from a network of nutrient sensors, neuroendocrine circuits, and tissue-specific metabolic programs that partition substrates between storage and oxidation. Conventional approaches to studying body-mass regulation have often...

Introduction The growth hormone secretagogue receptor (GHSR1a), also known as the ghrelin receptor, integrates metabolic cues with hypothalamic–pituitary signaling to modulate pulsatile growth hormone (GH) release and downstream insulin-like growth factor-1 (IGF-1)...

Introduction Coordinated regulation of growth hormone (GH) relies on convergent inputs from hypothalamic growth hormone–releasing hormone (GHRH) and peripheral ghrelin-family signals acting through distinct receptors on pituitary somatotrophs. In laboratory models,...

Introduction Cellular energy balance is coordinated by endocrine cues that couple nutrient status to growth, repair, and substrate selection. Central to this network is the somatotropic axis, in which growth hormone–releasing hormone (GHRH) stimulates pituitary...

Introduction Cellular aging emerges from the interplay of genome integrity, stress-response signaling, and macromolecular quality control. Telomeres—repetitive DNA–protein structures at chromosome ends—progressively shorten during replication and become dysfunctional...

Introduction Energy homeostasis emerges from coordinated neurotransmission within hypothalamic and mesolimbic circuits, peripheral metabolic signals, and adaptive changes in substrate utilization. Disruption of these networks can shift the balance between energy...

Introduction Chromosome termini are capped by telomeres—hexameric TTAGGG repeats bound by shelterin proteins—that preserve genome integrity by preventing end-to-end fusion, exonucleolytic degradation, and inappropriate DNA damage signaling. Because conventional DNA...

Introduction Learning, memory formation, and cellular resilience to injury rely on coordinated transcriptional programs, synaptic plasticity, and stress-response signaling in the central nervous system. Perturbations such as excitotoxic calcium influx,...

Introduction Sleep–wake regulation emerges from interacting neural circuits, neuromodulators, and endocrine cues that shape transitions among vigilance states and sculpt electrophysiological signatures such as slow-wave (delta) activity. Despite extensive mapping of...

Introduction Progressive neurodegenerative processes in laboratory models of Parkinson’s disease (PD) and Alzheimer’s disease (AD) converge on synaptic failure, proteostasis disruption, neuroinflammation, and selective neuronal vulnerability. Canonical features...

Introduction Cellular senescence is a stress-adaptive phenotype defined by stable cell-cycle exit, altered chromatin architecture, metabolic rewiring, and a distinct secretory program. In experimental systems, senescence can be triggered by DNA damage, oncogenic...