Disorganization and degeneration of liver sympathetic innervations in nonalcoholic fatty liver disease revealed by 3D imaging.
Csaba Adori,Teresa Daraio,Raoul Kuiper,Swapnali Barde,Lubica Horvathova,Takashi Yoshitake,Robert Ihnatko,Ismael Valladolid-Acebes,Pauline Vercruysse,Ashley M Wellendorf,Roberto Gramignoli,Béla Bozóky,Jan Kehr,Elvar Theodorsson,Jose A. Cancelas,Jose A. Cancelas,Boris Mravec,Boris Mravec,Carl Jorns,Ewa Ellis,Jan Mulder,Mathias Uhlén,Mathias Uhlén,Christina Bark,Tomas Hökfelt +24 more
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TLDR
In this article, the authors used 3D immunoimaging to explore the integrity of the hepatic nervous system in experimental and human nonalcoholic fatty liver disease (NAFLD) and demonstrate parallel signs of mild degeneration and axonal sprouting of sympathetic innervations in early stages of experimental NAFLD and a collapse of sympathetic arborization in steatohepatitis.Abstract:
Hepatic nerves have a complex role in synchronizing liver metabolism. Here, we used three-dimensional (3D) immunoimaging to explore the integrity of the hepatic nervous system in experimental and human nonalcoholic fatty liver disease (NAFLD). We demonstrate parallel signs of mild degeneration and axonal sprouting of sympathetic innervations in early stages of experimental NAFLD and a collapse of sympathetic arborization in steatohepatitis. Human fatty livers display a similar pattern of sympathetic nerve degeneration, correlating with the severity of NAFLD pathology. We show that chronic sympathetic hyperexcitation is a key factor in the axonal degeneration, here genetically phenocopied in mice deficient of the Rac-1 activator Vav3. In experimental steatohepatitis, 3D imaging reveals a severe portal vein contraction, spatially correlated with the extension of the remaining nerves around the portal vein, enlightening a potential intrahepatic neuronal mechanism of portal hypertension. These fundamental alterations in liver innervation and vasculature uncover previously unidentified neuronal components in NAFLD pathomechanisms.read more
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References
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Vav3 collaborates with p190-BCR-ABL in lymphoid progenitor leukemogenesis, proliferation, and survival
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Metabolic stress drives sympathetic neuropathy within the liver.
TL;DR: In this paper, the authors examined neural distributions in the mouse, nonhuman primate, and human livers with advanced 3D imaging and found that neural innervations within the liver are predominantly sympathetic, but not parasympathetic, inputs.