{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nCalcitonin gene‐related peptide (CGRP) is widely expressed in primary sensory neurons where it plays a pivotal role in detecting and modulating noxious stimuli. In these neurons, CGRP participates in encoding heat and itch sensations, modulating responses to capsaicin and inflammatory agents, and even mediating cross‐inhibition of cold‐responsive circuits. Its release, triggered by depolarizing stimuli and receptor activation (e.g. TRPV1), impacts both tonic and evoked neuronal activity, thereby influencing pain processing and thermosensory balance."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond sensory transduction, CGRP serves as an important immune modulator. Its autocrine and paracrine actions in innate lymphoid cells and dendritic cells temper inflammatory cascades by constraining cytokine production and cellular proliferation. CGRP signaling can recalibrate chemokine profiles—dampening pro‐inflammatory mediators while promoting factors associated with Th2 responses—and thereby shapes tissue immune homeostasis in contexts such as helminth infection and endotoxemia."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "15"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn skeletal biology, CGRP functions as a key regulator of bone remodeling. Distinct mouse models implicate it in modulating osteoclast and osteoblast activities so that its deficiency or dysregulation can lead to altered bone formation rates and shifts in trabecular bone mass. These observations underscore a dual role for the Calca gene products in limiting bone resorption while stimulating bone formation under normocalcemic conditions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "16", "end_ref": "19"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nCGRP‐expressing neuronal circuits in the parabrachial nucleus and related forebrain regions are instrumental in regulating feeding behaviors and mediating conditioned taste aversion. Activation or suppression of these neurons influences meal size, satiety signaling, and the aversive learning associated with gastrointestinal distress, thereby integrating homeostatic controls over energy intake."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the cardiovascular system, CGRP is recognized as a potent vasodilator that contributes to blood pressure regulation and protects against vascular injury. Its signaling reduces hypertrophy and fibrosis in arterial walls and exerts anti‐inflammatory effects on dendritic cells, collectively maintaining vascular homeostasis under hypertensive and inflammatory conditions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "22", "end_ref": "26"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nCGRP also plays a central role in angiogenesis and tissue repair. It promotes endothelial tube formation, stimulates vascular endothelial growth factor expression, and modulates neurogenic inflammation—features that facilitate wound healing and may influence tumor-associated blood vessel formation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "27", "end_ref": "29"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nRecent findings indicate that CGRP can influence systemic energy homeostasis and lipid metabolism. Mouse models deficient in CGRP display alterations in core temperature and energy expenditure that protect against diet-induced obesity and improve glucose handling, suggesting that CGRP signaling interconnects neural and metabolic regulatory networks."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "30"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nWithin the auditory and vestibular systems, CGRP is localized in efferent nerve fibers and modulates neural response growth and signal transmission. Its presence in cochlear and vestibular circuitry is linked to sound-evoked activity and vestibulo-ocular reflex performance, underscoring its contribution to sensory processing in the inner ear."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "31"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the molecular level, CGRP signaling is mediated by complexes comprising G protein–coupled receptors (GPCRs), such as the calcitonin receptor-like receptor in concert with receptor activity-modifying proteins. Transcriptional regulators and chromatin remodeling complexes further fine-tune the expression of genes downstream of CGRP, illustrating a mechanistic basis for its diverse physiological actions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "33", "end_ref": "35"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn hepatic physiology, CGRP influences cholangiocyte proliferation during cholestatic injury. By engaging cAMP‐dependent pathways, it modulates biliary cell growth and thereby contributes to liver repair and the maintenance of biliary homeostasis under conditions of stress."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "36"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nCGRP is also cardioprotective in pressure overload and heart failure models, where its presence limits adverse remodeling, reduces fibrosis, and curtails inflammatory cell death. These actions collectively preserve cardiac function during pathological stress."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "38"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMoreover, CGRP contributes to gastrointestinal defense mechanisms. 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