Regulation of liver regeneration

Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association
Arthur Zimmermann

Abstract

Hepatocyte regeneration proceeds along a sequence of distinctive phases and results in a precise reconstitution of the lost tissue mass. The molecular mechanisms regulating liver regeneration have recently been elucidated. Important aspects of the regulatory steps of hepatocyte proliferation during regeneration are summarized. Hepatocytes normally remain in proliferative quiescence. Regeneration requires priming of hepatocytes to achieve competence for proliferation. This is the initiation phase, which is regulated by cytokines, including interleukin-6 and tumour necrosis factor-alpha. During the subsequent proliferation, the hepatocyte population is expanded (the expansion phase), it being chiefly regulated by hepatocyte growth factor and transforming growth factor-alpha. Upon sensing of the required cell mass, the proliferation response is terminated (termination phase) and is mainly mediated by transforming growth factor-beta and activins. These structured processes go in line with a remodelling response, resulting in the reconstruction of a vascularized liver lobule. Liver regeneration proceeds in a highly ordered fashion, critical steps being regulated by several molecular mechanisms acting in a characteristic timely seque...Continue Reading

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