1. Resistin as an Intrahepatic Cytokine
- Author
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Sara Aleffi, Pau Sancho-Bru, Paola Romagnani, Benedetta Mazzinghi, Raffaella DeFranco, Ramon Bataller, Fabio Marra, Pere Ginès, Roberto Tarquini, Paola Failli, C. Bertolani, Giacomo Laffi, Jordi Colmenero, Massimo Pinzani, Stefania Gelmini, Maurizio Parola, and Stefano Milani
- Subjects
medicine.medical_specialty ,endocrine system diseases ,Liver cytology ,Kupffer cell ,nutritional and metabolic diseases ,Adipose tissue ,Adipokine ,respiratory system ,Biology ,medicine.disease ,Pathology and Forensic Medicine ,Proinflammatory cytokine ,medicine.anatomical_structure ,Endocrinology ,Fibrosis ,Internal medicine ,medicine ,Hepatic stellate cell ,Resistin ,hormones, hormone substitutes, and hormone antagonists - Abstract
Obesity and insulin resistance accelerate the progression of fibrosis during chronic liver disease. Resistin antagonizes insulin action in rodents, but its role in humans is still controversial. The aims of this study were to investigate resistin expression in human liver and to evaluate whether resistin may affect the biology of activated human hepatic stellate cells (HSCs), key modulators of hepatic fibrogenesis. Resistin gene expression was low in normal human liver but was increased in conditions of severe fibrosis. Up-regulation of resistin during chronic liver damage was confirmed by immunohistochemistry. In a group of patients with alcoholic hepatitis, resistin expression correlated with inflammation and fibrosis, suggesting a possible action on HSCs. Exposure of cultured HSCs to recombinant resistin resulted in increased expression of the proinflammatory chemokines monocyte chemoattractant protein-1 and interleukin-8, through activation of nuclear factor (NF)-κB. Resistin induced a rapid increase in intracellular calcium concentration, mainly through calcium release from intracellular inositol triphosphate-sensitive pools. The intracellular calcium chelator BAPTA-AM blocked resistin-induced NF-κB activation and monocyte chemoattractant protein-1 expression. In conclusion, this study shows a role for resistin as an intrahepatic cytokine exerting proinflammatory actions in HSCs, via a Ca 2+ /NF-κB-dependent pathway and suggests involvement of this adipokine in the pathophysiology of liver fibrosis.
- Published
- 2006
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