Objective: The interaction of cancer cell with extracellular matrix (ECM) happens as an earlier and specific event in the invasive and metastatic cascade. To explore the key element(s) in cancer metastasis and observe...Objective: The interaction of cancer cell with extracellular matrix (ECM) happens as an earlier and specific event in the invasive and metastatic cascade. To explore the key element(s) in cancer metastasis and observe the cellECM interaction and its role. Methods: To interrupt the cellECM interaction by suppression of adhesioninduced protein tyrosine phosphorylation with protein tyrosine kinase inhibitor genistein in B16B16 mouse melanoma cells. Results: When B16BL6 cells attached to Matrigel, a solubilized basement membrane preparation from EHS sarcoma, a 125 kDa protein increased its phosphotyrosine content dramatically. In contrast, when the cells were pretreated with 20μM or 30 μM genistein for 3 days, it was revealed a less increase in the phosphotyrosine content of this 125 kDa protein in response to cell attachment to ECM was revealed with immunoblot analysis. Accompanied by the lower level of adhesioninduced protein tyrosine phosphorylation the genisteintreated cells exhibited a decrease in their capabilities of adhesion to Matrigel and invasion through reconstituted basement membrane. The potentials of and forming lung metastatic nodules were also shown to be decreased dramatically in these genisteintreated cells. Conclusion: It was suggested that protein tyrosine phosphorylation in cellECM interaction might be associated with invasive and metastatic potentials in cancer cells.展开更多
文摘Objective: The interaction of cancer cell with extracellular matrix (ECM) happens as an earlier and specific event in the invasive and metastatic cascade. To explore the key element(s) in cancer metastasis and observe the cellECM interaction and its role. Methods: To interrupt the cellECM interaction by suppression of adhesioninduced protein tyrosine phosphorylation with protein tyrosine kinase inhibitor genistein in B16B16 mouse melanoma cells. Results: When B16BL6 cells attached to Matrigel, a solubilized basement membrane preparation from EHS sarcoma, a 125 kDa protein increased its phosphotyrosine content dramatically. In contrast, when the cells were pretreated with 20μM or 30 μM genistein for 3 days, it was revealed a less increase in the phosphotyrosine content of this 125 kDa protein in response to cell attachment to ECM was revealed with immunoblot analysis. Accompanied by the lower level of adhesioninduced protein tyrosine phosphorylation the genisteintreated cells exhibited a decrease in their capabilities of adhesion to Matrigel and invasion through reconstituted basement membrane. The potentials of and forming lung metastatic nodules were also shown to be decreased dramatically in these genisteintreated cells. Conclusion: It was suggested that protein tyrosine phosphorylation in cellECM interaction might be associated with invasive and metastatic potentials in cancer cells.