Fibroblast growth factor 19 stimulates water intake

Area of Science:

• Endocrinology
• Metabolic Research
• Hepatocellular Carcinoma

Background:

• Fibroblast growth factor 19 (FGF19) is a hormone with diverse metabolic roles.
• FGF19 is implicated in hepatocellular carcinoma (HCC) pathogenesis due to overexpression in some patients.
• Understanding FGF19's effects during chronic elevation is critical for therapeutic development and cancer research.

Purpose of the Study:

• To investigate the long-term effects of hepatic Fibroblast growth factor 19 (FGF19) overexpression.
• To identify novel functions of FGF19, particularly in response to chronic hormonal elevation.
• To explore the clinical relevance of FGF19's effects in metabolic disorders and HCC.

Main Methods:

• Generation of a transgenic mouse model with sustained hepatic FGF19 overexpression via hydrodynamic gene transfer.
• Assessment of FGF19-induced physiological changes, including water intake and natremia.
• Correlation analysis between circulating FGF19 levels and dipsogenic features in HCC patients.

Main Results:

• Demonstrated a novel FGF19-mediated stimulation of water intake in mice, persisting for at least six months.
• Identified that this dipsogenic effect is dependent on central nervous system signaling and independent of FGF21.
• Observed reduced natremia in HCC patients with high FGF19 levels, suggesting similar dipsogenic activity.

Conclusions:

• Fibroblast growth factor 19 (FGF19) possesses a previously unrecognized ability to stimulate water intake.
• This FGF19 activity is mediated by the central nervous system and has clinical implications for managing metabolic disorders and FGF19-driven cancers.
• The findings highlight FGF19's complex role and suggest potential therapeutic targets for both metabolic diseases and HCC.