Inhibition of adhesion of hepatocellular carcinoma cells to basement membrane components by receptor competition with RGD- or YIGSR-containing synthetic peptides.
A micropipette technique was used to investigate the effects of four synthetic peptides, YIGSR, CDPGYIGSR, RGDS and GRGDTP, on the adhesion of hepatocellular carcinoma (HCC) cells onto type IV collagen/laminin/fibronectin coated surfaces. Adhesion of HCC cells to laminin was found to be YIGSR- or CDPGYIGSR-dependent while that to fibronectin and type IV collagen was RGDS- or GRGDTP-dependent. The reduction in adhesion strengths of HCC cells was slight to moderate (up to 55%), and was dependent on the peptide concentration. The decrease in adhesion strengths was reversed by an increase in ligand coating concentration and was compromised by prolonged interaction of the cells with the surfaces. These results suggested that the inhibition was due to competitive retardation rather than to a blockade of adhesion strengthening. A simple asymptotic function was adopted to fit the correlation between the mean of cell adhesion strengths and peptide concentration within defined concentration ranges. Regression analysis showed that cell adhesion strengths appeared to approach a plateau with increasing concentration of the inhibitory peptides, which was not always uniform over the entire concentration range tested. Further reduction in adhesion strengths was observed at higher peptide concentrations. It is suggested that the constants obtained by fitting over a low peptide concentration range might be kinetically representative of the inhibition during early events of adhesion or attachment.
Wu
Ze-Zhi
ZZ
College of Bioengineering, Key Laboratory for Biomechanics and Tissue Engineering under the State Ministry of Education, Chongqing University, P.R. China. bio@cqu.edu.cn
Li
Ping
P
Huang
Qi-Ping
QP
Qin
Jian
J
Xiao
Guo-Hui
GH
Cai
Shao-Xi
SX
D001485:Basement Membrane / Q000378:metabolism; D001667:Binding, Competitive; D006528:Carcinoma, Hepatocellular / Q000378:metabolism* / Q000473:pathology; D002448:Cell Adhesion / Q000187:drug effects; D024141:Collagen Type IV / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005353:Fibronectins / Q000378:metabolism; D006801:Humans; D007797:Laminin / Q000378:metabolism; D008113:Liver Neoplasms / Q000378:metabolism* / Q000473:pathology; D008846:Micromanipulation / Q000379:methods; D009363:Neoplasm Proteins / Q000378:metabolism; D009842:Oligopeptides / Q000494:pharmacology*; D014407:Tumor Cells, Cultured
D024141:Collagen Type IV; D005353:Fibronectins; D007797:Laminin; D009363:Neoplasm Proteins; D009842:Oligopeptides; C081571:tyrosyl-isoleucyl-glycyl-seryl-arginine; C047981:arginyl-glycyl-aspartic acid