Role of growth hormone (GH) in liver regeneration

Endocrinology
Patricia A PennisiShoshana Yakar

Abstract

Liver regeneration is a fundamental mechanism by which the liver responds to injury. This process is regulated by endogenous growth factors and cytokines, and it involves proliferation of all mature cells that exist within the intact organ. To understand the role of the GH/IGF-I axis in liver regeneration, we performed partial hepatectomies in three groups of mice: GH antagonist (GHa) transgenic mice, in which the action of GH is blocked; liver IGF-I-deficient mice that lack IGF-I specifically in the liver and also lack the acid-labile subunit (ALS; LID+ALSKO mice), in which IGF-I levels are very low and GH secretion is increased; and control mice. Interestingly, the survival rate of GHa transgenic mice was dramatically reduced after partial hepatectomy (57%) compared with the survival rate of controls (100%) or LID+ALSKO mice (88%). In control mice, the liver was completely regenerated after 4 d, whereas liver regeneration required 7 d in LID+ALSKO mice. In contrast, in GHa mice, liver regeneration reached only 70% of the original liver mass after 4 d and did not improve thereafter. Strikingly, 36 and 48 h after hepatectomy, the livers of control and LID+ALSKO mice, respectively, exhibited intense 5-bromo-2'-deoxyuridine (BrdU...Continue Reading

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