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FGF16
FGF16 Full Name
fibroblast growth factor 16
FGF16 Introduction
FGF16 is a member of the fibroblast growth factor family that is distinguished by its potent and cardiotropic bioactivity, mediating paracrine and autocrine signaling that is essential for embryonic heart development, adult cardiac homeostasis, and metabolic regulation in adipose tissue. During embryogenesis, FGF16 is robustly expressed in the developing heart, particularly within the epicardium and endocardium, where it drives cardiomyocyte proliferation and thereby enables the chamber wall thickening and trabeculation that are requisite for functional cardiac morphogenesis. Genetic ablation of Fgf16 in mice results in embryonic lethality on certain strain backgrounds, with profound defects in ventricular wall formation, chamber dilation, and intramyocardial hemorrhage, establishing an indispensable role in fetal cardiac development. In the adult heart, FGF16 is downregulated under basal conditions but is robustly re-induced by hypertrophic stimuli, adrenergic stress, and genotoxic injury, where it functions as an endogenous cardioprotective factor that antagonizes pathological remodeling and cardiomyopathy.
Figure 1. Spatiotemporal expression patterns of FGF16 during embryonic development, postnatal stages, and in adult tissues across species. (Source: Hui X, et al. 2025)
The signaling mechanisms underlying FGF16's cardiac actions are multifaceted. FGF16 binds preferentially to FGFR1c in cardiomyocytes, activating the PI3K/Akt and PKC pathways that together oppose apoptosis, attenuate maladaptive fibrosis, and preserve contractile function. Notably, FGF16 functionally antagonizes FGF2 in the adult heart: whereas FGF2 stimulates TGF-β1 expression and thereby promotes pathological hypertrophy and fibrosis, FGF16 competitively inhibits FGF2 binding to FGFR1c and suppresses the FGF2/TGF-β1 axis, rendering it a naturally occurring brake on maladaptive cardiac remodeling. Human genetic studies have linked FGF16 dysregulation to congenital heart disease: in induced pluripotent stem cell (iPSC)-derived cardiomyocytes harboring a GATA4 T280M mutation — a cause of atrial septal defect — FGF16 expression is markedly downregulated, and restoration of FGF16 levels rescues the cardiomyocyte proliferative defect, providing a direct mechanistic link between transcription factor mutation, FGF16 dysregulation, and congenital heart malformation. Beyond the heart, FGF16 is expressed in embryonic brown adipose tissue and promotes adipocyte differentiation and thermogenic gene expression, indicating a broader role in metabolic regulation.
Alternate Names for FGF16
FGF16; fibroblast growth factor 16; FGF-16;
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