Background & aims: Cholangiocytes are the target cells of liver diseases that are characterized by biliary senescence (evidenced by enhanced levels of senescence-associated secretory phenotype, SASP, e.g., TGF-beta 1), and liver inflammation and fibrosis accompanied by altered bile acid (BA) homeostasis. Taurocholic acid (TC) stimulates biliary hyperplasia by activation of 3 ',5 '-cyclic cyclic adenosine monophosphate (cAMP) signaling, thereby preventing biliary damage (caused by cholinergic/adrenergic denervation) through enhanced liver angiogenesis. Also: (i) alpha-calcitonin gene-related peptide (alpha-CGRP, which activates the calcitonin receptor-like receptor, CRLR), stimulates biliary proliferation/senescence and liver fibrosis by enhanced biliary secretion of SASPs; and (ii) knock-out of alpha-CGRP reduces these phenotypes by decreased cAMP levels in cholestatic models. We aimed to demonstrate that TC effects on liver phenotypes are dependent on changes in the alpha-CGRP/CALCRL/cAMP/PKA/ERK1/2/TGF-beta 1/VEGF axis. Methods: Wild-type and alpha-CGRP(-/-) mice were fed with a control (BAC) or TC diet for 1 or 2 wk. We measured: (i) CGRP levels by both ELISA kits in serum and by qPCR in isolated cholangiocytes (CALCA gene for alpha-CGRP); (ii) CALCRL immunoreactivity by immunohistochemistry (IHC) in liver sections; (iii) liver histology, intrahepatic biliary mass, biliary senescence (by beta-GAL staining and double immunofluorescence (IF) for p16/CK19), and liver fibrosis (by Red Sirius staining and double IF for collagen/CK19 in liver sections), as well as by qPCR for senescence markers in isolated cholangiocytes; and (iv) phosphorylation of PKA/ERK1/2, immunoreactivity of TGF-beta 1/TGF- beta RI and angiogenic factors by IHC/immunofluorescence in liver sections and qPCR in isolated cholangiocytes. We measured changes in BA composition in total liver by liquid chromatography/mass spectrometry. Results: TC feeding increased CALCA expression, biliary damage, and liver inflammation and fibrosis, as well as phenotypes that were associated with enhanced immunoreactivity of the PKA/ERK1/2/TGF-beta 1/TGF-beta RI/VEGF axis compared to BAC-fed mice and phenotypes that were reversed in alpha-CGRP(-/-) mice fed TC coupled with changes in hepatic BA composition. Conclusion: Modulation of the TC/ alpha-CGRP/CALCRL/PKA/ERK1/2/TGF-beta 1/VEGF axis may be important in the management of cholangiopathies characterized by BA accumulation.

The effects of taurocholic acid on biliary damage and liver fibrosis are mediated by calcitonin-gene-related peptide signaling / Mancinelli, Romina; Ceci, Ludovica; Kennedy, Lindsey; Francis, Heather; Meadows, Vik; Chen, Lixian; Carpino, Guido; Kyritsi, Konstantina; Wu, Nan; Zhou, Tianhao; Sato, Keisaku; Pannarale, Luigi; Glaser, Shannon; Chakraborty, Sanjukta; Alpini, Gianfranco; Gaudio, Eugenio; Onori, Paolo; Franchitto, Antonio. - In: CELLS. - ISSN 2073-4409. - 11:9(2022), pp. 1-21. [10.3390/cells11091591]

The effects of taurocholic acid on biliary damage and liver fibrosis are mediated by calcitonin-gene-related peptide signaling

Romina Mancinelli;Ludovica Ceci;Guido Carpino;Luigi Pannarale;Gianfranco Alpini;Eugenio Gaudio;Paolo Onori;
2022

Abstract

Background & aims: Cholangiocytes are the target cells of liver diseases that are characterized by biliary senescence (evidenced by enhanced levels of senescence-associated secretory phenotype, SASP, e.g., TGF-beta 1), and liver inflammation and fibrosis accompanied by altered bile acid (BA) homeostasis. Taurocholic acid (TC) stimulates biliary hyperplasia by activation of 3 ',5 '-cyclic cyclic adenosine monophosphate (cAMP) signaling, thereby preventing biliary damage (caused by cholinergic/adrenergic denervation) through enhanced liver angiogenesis. Also: (i) alpha-calcitonin gene-related peptide (alpha-CGRP, which activates the calcitonin receptor-like receptor, CRLR), stimulates biliary proliferation/senescence and liver fibrosis by enhanced biliary secretion of SASPs; and (ii) knock-out of alpha-CGRP reduces these phenotypes by decreased cAMP levels in cholestatic models. We aimed to demonstrate that TC effects on liver phenotypes are dependent on changes in the alpha-CGRP/CALCRL/cAMP/PKA/ERK1/2/TGF-beta 1/VEGF axis. Methods: Wild-type and alpha-CGRP(-/-) mice were fed with a control (BAC) or TC diet for 1 or 2 wk. We measured: (i) CGRP levels by both ELISA kits in serum and by qPCR in isolated cholangiocytes (CALCA gene for alpha-CGRP); (ii) CALCRL immunoreactivity by immunohistochemistry (IHC) in liver sections; (iii) liver histology, intrahepatic biliary mass, biliary senescence (by beta-GAL staining and double immunofluorescence (IF) for p16/CK19), and liver fibrosis (by Red Sirius staining and double IF for collagen/CK19 in liver sections), as well as by qPCR for senescence markers in isolated cholangiocytes; and (iv) phosphorylation of PKA/ERK1/2, immunoreactivity of TGF-beta 1/TGF- beta RI and angiogenic factors by IHC/immunofluorescence in liver sections and qPCR in isolated cholangiocytes. We measured changes in BA composition in total liver by liquid chromatography/mass spectrometry. Results: TC feeding increased CALCA expression, biliary damage, and liver inflammation and fibrosis, as well as phenotypes that were associated with enhanced immunoreactivity of the PKA/ERK1/2/TGF-beta 1/TGF-beta RI/VEGF axis compared to BAC-fed mice and phenotypes that were reversed in alpha-CGRP(-/-) mice fed TC coupled with changes in hepatic BA composition. Conclusion: Modulation of the TC/ alpha-CGRP/CALCRL/PKA/ERK1/2/TGF-beta 1/VEGF axis may be important in the management of cholangiopathies characterized by BA accumulation.
2022
bile acid; biliary senescence; cAMP; sensory innervation
01 Pubblicazione su rivista::01a Articolo in rivista
The effects of taurocholic acid on biliary damage and liver fibrosis are mediated by calcitonin-gene-related peptide signaling / Mancinelli, Romina; Ceci, Ludovica; Kennedy, Lindsey; Francis, Heather; Meadows, Vik; Chen, Lixian; Carpino, Guido; Kyritsi, Konstantina; Wu, Nan; Zhou, Tianhao; Sato, Keisaku; Pannarale, Luigi; Glaser, Shannon; Chakraborty, Sanjukta; Alpini, Gianfranco; Gaudio, Eugenio; Onori, Paolo; Franchitto, Antonio. - In: CELLS. - ISSN 2073-4409. - 11:9(2022), pp. 1-21. [10.3390/cells11091591]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1680186
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