KAI1/CD82 suppresses tumor invasion by MMP9 inactivation via TIMP1 up-regulation in the H1299 human lung carcinoma cell line.
We conducted a study on the mechanism of KAI1/CD82-mediated suppression of tumor invasiveness and metastasis, and examined its effect on MMP-9 activity and the TIMP1 levels in H1299 human non-small cell lung carcinoma cells. The H1299 human lung carcinoma cells were transfected with pcDNA3.1-CD82 and stable transfectant clones that had a high KAI1/CD82 expression were obtained. We performed Western blot analysis, cell invasion assay, gelatin zymography, and RT-PCR to assess the KAI1/CD82 expression and tumor invasiveness, the MMP-9 activity, the MMP-9 mRNA and protein levels, and the TIMP1 levels in the H1299/CD82 transfectant cells and compared the results with those of the control groups. The H1299/CD82 transfectants exhibited significant suppression of cell invasion, reduced MMP9 enzyme activity, elevated MMP9 mRNA and MMP-9 protein levels, and elevated TIMP1 levels. It may be postulated that KAI1/CD82 over-expression in the H1299 non-small cell lung carcinoma cells suppresses the tumor invasiveness and metastatic potential by inducing MMP9 inactivation via the up-regulation of TIMP1.
Neuroscience Genome Research Center, The Catholic University of Korea, 505 Banpo-dong, Socho-ku, Seoul 137-701, Republic of Korea.
Bo Keun
BK
Jee
Koung Min
KM
Park
Sibin
S
Surendran
Woon Kyu
WK
Lee
Chang Whan
CW
Han
Yong Sik
YS
Kim
Young
Y
Lim
D002277:Carcinoma / Q000201:enzymology / Q000378:metabolism / Q000473:pathology*; D045744:Cell Line, Tumor; D006801:Humans; D051861:Kangai-1 Protein / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D008175:Lung Neoplasms / Q000201:enzymology* / Q000378:metabolism / Q000473:pathology*; D020780:Matrix Metalloproteinase 9 / Q000235:genetics / Q000378:metabolism*; D061965:Matrix Metalloproteinase Inhibitors; D009361:Neoplasm Invasiveness / Q000473:pathology / Q000517:prevention & control; D012333:RNA, Messenger / Q000378:metabolism; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000235:genetics / Q000502:physiology*; D014162:Transfection; D015854:Up-Regulation / Q000502:physiology*
C497688:CD82 protein, human; D051861:Kangai-1 Protein; D061965:Matrix Metalloproteinase Inhibitors; D012333:RNA, Messenger; D019715:Tissue Inhibitor of Metalloproteinase-1; D020780:Matrix Metalloproteinase 9