HGF/SF-induced spreading of MDCK cells correlates with disappearance of barmotin/7H6, a tight junction-associated protein, from the cell membrane.
Changes in expression of the two tight junction-associated proteins, barmotin/7H6 and ZO-1, as well as the adherence junction-associated protein, E-cadherin, were followed during hepatocyte growth factor/scatter factor (HGF/SC)-induced migration process of MDCK cells. Modulation of the HGF/SF-induced migration process by staurosporine, an inhibitor of protein kinase C (PKC), was also examined. Cell migration induced by HGF/SF consisted of two distinct phases, initial cell spreading between 2 and 9 h after the start of treatment, and the scattering phase which started approximately 12 h after treatment. Both ZO-1 and E-cadherin were expressed at the cell-cell border of adherent cells in the scattering phase, whereas barmotin/7H6, a barrier function-related tight junction protein, was not seen during the early spreading phase. Confluent cultures of MDCK cells, which did not spread after HGF/SF treatment, were positive for barmotin/7H6 expression at cell-cell borders. Blocking PKC activation during HGF/SF treatment with staurosporine inhibited cell spreading, and the cells retained barmotin/7H6 expression until at 6 h after HGF/SF treatment. The results indicate that disappearance of the tight junction protein, barmotin/7H6, is closely associated with cell spreading, with both barmotin/7H6 expression and cell spreading seemingly being regulated by PKC-mediated signaling.
Muto
S
S
Department of Pathology, Akita University School of Medicine, Hondo, Japan.
Sato
Y
Y
Umeki
Y
Y
Yoshida
K
K
Yoshioka
T
T
Nishikawa
Y
Y
Nakamura
T
T
Mori
M
M
Koyama
K
K
Enomoto
K
K
D000818:Animals; D015820:Cadherins / Q000378:metabolism; D002448:Cell Adhesion / Q000187:drug effects; D002460:Cell Line; D002465:Cell Movement / Q000502:physiology*; D048429:Cell Size / Q000187:drug effects; D004285:Dogs; D004791:Enzyme Inhibitors / Q000494:pharmacology; D004847:Epithelial Cells; D005455:Fluorescent Antibody Technique; D017228:Hepatocyte Growth Factor / Q000494:pharmacology*; D015151:Immunoblotting; D008565:Membrane Proteins / Q000276:immunology / Q000378:metabolism*; D010750:Phosphoproteins / Q000276:immunology / Q000378:metabolism*; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000378:metabolism; D019311:Staurosporine / Q000494:pharmacology; D019108:Tight Junctions / Q000378:metabolism*; D062826:Zonula Occludens-1 Protein
D015820:Cadherins; D004791:Enzyme Inhibitors; D008565:Membrane Proteins; D010750:Phosphoproteins; D062826:Zonula Occludens-1 Protein; C089734:antigen 7H6; D017228:Hepatocyte Growth Factor; D011493:Protein Kinase C; D019311:Staurosporine