Effect of laminin on the nuclear localization of nucleolin in rat intestinal epithelial IEC-6 cells.
Laminin is a major component of extracellular matrix. The mechanism of action of laminin on cell proliferation, differentiation, and migration is not fully understood. In this study, we investigated the role of extracellular matrix, especially laminin, on the cellular localization of the nuclear protein, nucleolin, and on cell proliferation. Immunofluorescent and western blot analysis indicated that nucleolin was translocated most efficiently to the nucleus in the small intestinal rat epithelial cell line (IEC-6) when cultured on laminin-coated plates. Specifically, nucleolin was observed predominantly in cytoplasm in the cells cultured without laminin. In contrast, nuclear localization was observed in the cells cultured on laminin. This effect of laminin on nucleolin translocation was time-dependent. Laminin was also observed to stimulate proliferation of IEC-6 cells in serum free medium. Our results suggest that laminin alters the distribution of nucleolin which may be an early signal for cell proliferation.
Yu
D
D
Department of Surgery, duPont Hospital for Children, Wilmington, Delaware 19899, USA.
Schwartz
M Z
MZ
Petryshyn
R
R
D000818:Animals; D001692:Biological Transport; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D002467:Cell Nucleus / Q000187:drug effects / Q000378:metabolism*; D004847:Epithelial Cells / Q000166:cytology / Q000378:metabolism*; D007413:Intestinal Mucosa / Q000166:cytology / Q000378:metabolism*; D007797:Laminin / Q000494:pharmacology*; D009687:Nuclear Proteins / Q000187:drug effects / Q000378:metabolism; D010750:Phosphoproteins / Q000187:drug effects / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000187:drug effects / Q000378:metabolism*; D051381:Rats; D013347:Subcellular Fractions / Q000187:drug effects / Q000378:metabolism; D000097796:Nucleolin
D007797:Laminin; D009687:Nuclear Proteins; D010750:Phosphoproteins; D016601:RNA-Binding Proteins; D000097796:Nucleolin