title: Biomechanics and functionality of hepatocytes in liver cirrhosis.
abstract: Cirrhosis is a life-threatening condition that is generally attributed to overproduction of collagen fibers in the extracellular matrix that mechanically stiffens the liver. Chronic liver injury due to causes including viral hepatitis, inherited and metabolic liver diseases and external factors such as alcohol abuse can result in the development of cirrhosis. Progression of cirrhosis leads to hepatocellular dysfunction. While extensive studies to understand the complexity underlying liver fibrosis have led to potential application of anti-fibrotic drugs, no such FDA-approved drugs are currently available. Additional studies of hepatic fibrogenesis and cirrhosis primarily have focused on the extracellular matrix, while hepatocyte biomechanics has received limited attention. The role of hepatocyte biomechanics in liver cirrhosis remains elusive, and how the cell stiffness is correlated with biological functions of hepatocytes is also unknown. In this study, we demonstrate that the biomechanical properties of hepatocytes are correlated with their functions (e.g., glucose metabolism), and that hepatic dysfunction can be restored through modulation of the cellular biomechanics. Furthermore, our results indicate the hepatocyte functionality appears to be regulated through a crosstalk between the Rho and Akt signaling. These novel findings may lead to biomechanical intervention of hepatocytes and the development of innovative tissue engineering for clinical treatment to target liver cells rather than exclusively focusing on the extracellular matrix alone in liver cirrhosis.
authors.affiliation: Department of Bioengineering, University of Illinois at Chicago, Chicago, IL 60607, United States.
authors.forename: Shan
authors.initials: S
authors.lastname: Sun
authors.affiliation: Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, IL 60612, United States.
authors.forename: Zhenyuan
authors.initials: Z
authors.lastname: Song
authors.affiliation: Division of Hepatology, Loyola University Medical Center, Maywood, IL 60153, United States.
authors.forename: Scott J
authors.initials: SJ
authors.lastname: Cotler
authors.affiliation: Department of Bioengineering, University of Illinois at Chicago, Chicago, IL 60607, United States. Electronic address: mcho@uic.edu.
authors.forename: Michael
authors.initials: M
authors.lastname: Cho
mesh_terms: D001696:Biomechanical Phenomena; D056945:Hep G2 Cells; D022781:Hepatocytes / Q000502:physiology*; D006801:Humans; D008103:Liver Cirrhosis / Q000378:metabolism / Q000503:physiopathology*; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D015398:Signal Transduction; D054460:rho-Associated Kinases / Q000378:metabolism
chemical_list: D051057:Proto-Oncogene Proteins c-akt; D054460:rho-Associated Kinases
keywords: AFM; Cell biomechanics; Fibrosis; Hepatocyte; Rho/Akt crosstalk