title: Relative rigidity of cell-substrate effects on hepatic and hepatocellular carcinoma cell migration.
abstract: Polyacrylamide gels with different stiffness and glass were employed as substrates to investigate how substrate stiffness affects the cellular stiffness of adherent hepatocellular carcinoma (HCCLM3) and hepatic (L02) cells. The interaction of how cell-substrate stiffness influences cell migration was also explored. An atom force microscope measured the stiffness of HCCLM3 and L02 cells on different substrates. Further, F-actin assembly was analyzed using immunofluorescence and Western blot. Finally, cell-surface expression of integrin β1 was quantified by flow cytometry. The results show that, while both HCCLM3 and L02 cells adjusted their cell stiffness to comply with the stiffness of the substrate they were adhered to, their tuning capabilities were different. HCCLM3 cell stiffness complied when substrate stiffness was between 1.1 and 33.7 kPa, whereas the analogous stiffness for L02 cells occurred at a higher substrate stiffness, 3.6 kPa up to glass. These ranges correlated with F-actin filament assembly and integrin β1 expression. In a migration assay, HCCLM3 cells migrated faster on a relatively soft substrate, while L02 cells migrated faster on substrates that were relatively rigid. These findings indicate that different tuning capabilities of HCCLM3 and L02 cells may influence cell migration velocity on substrates with different stiffness by regulating cy- toskeleton remodeling and integrin β1 expression.
authors.affiliation: Key Laboratory of Biorheological Science and Technology, Chongqing University, Ministry of Education, Bioengineering College, Chongqing, 400044, PR China.
authors.forename: Yanzi
authors.initials: Y
authors.lastname: Yangben
authors.forename: Hongbing
authors.initials: H
authors.lastname: Wang
authors.forename: Li
authors.initials: L
authors.lastname: Zhong
authors.forename: Martin Y M
authors.initials: MY
authors.lastname: Chiang
authors.forename: Qiaoyan
authors.initials: Q
authors.lastname: Tan
authors.forename: Gurinder K
authors.initials: GK
authors.lastname: Singh
authors.forename: Song
authors.initials: S
authors.lastname: Li
authors.forename: Li
authors.initials: L
authors.lastname: Yang
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000199:Actins / Q000378:metabolism; D001672:Biocompatible Materials / Q000737:chemistry*; D006528:Carcinoma, Hepatocellular / Q000378:metabolism; D002448:Cell Adhesion; D045744:Cell Line, Tumor; D002465:Cell Movement; D003599:Cytoskeleton / Q000648:ultrastructure; D055119:Elastic Modulus; D004548:Elasticity; D005782:Gels / Q000737:chemistry; D005898:Glass / Q000737:chemistry*; D006801:Humans; D019012:Integrin beta1 / Q000378:metabolism; D008113:Liver Neoplasms / Q000378:metabolism; D008422:Materials Testing; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D000199:Actins; D001672:Biocompatible Materials; D005782:Gels; D019012:Integrin beta1; D000099166:Polyacrylamides