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Another adipokine supposed to have a crucial role in liver fibrosis is leptin. In fact, leptin increases TNF, TGF-ß1 and type 1 collagen expression in dosage liver, while fa/fa Zucker rats, which are resistant to leptin due to a leptin receptor defect, are resistant to thioaceta-mide-induced dosage liver fibrosis (20). However, a direct association between leptin and NAFLD was not confirmed in vivo in humans by Chalasani et al. (21), who found no correlation between dosage circulating leptin and leptin receptor expression in liver biopsies and nonalcoholic fatty liver patients. The lack of difference in plasma leptin between NAFLD patients and controls in our study does not further support a role for leptin in the development of NAFLD.
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