Abstract:
:The "a disintegrin and metalloprotease" (ADAM) family contributes to regulation of the cell-cell and cell-matrix interactions that are critical determinants of malignancy. To determine the relationship between metastasis and ADAM proteins, we compared the mRNA levels of ADAM9, -10, -12, -15, and -17 in sublines of an EBC-1 lung cancer cell line that were highly metastatic to either brain or bone. ADAM9 mRNA levels were significantly higher in highly brain-metastatic sublines than in the parent or highly bone-metastatic sublines. To elucidate the role of ADAM9 in brain metastasis, we stably transfected A549 and EBC-1 cells with a full-length ADAM9 expression vector. Compared with mock-transfectants, ADAM9 overexpression resulted in increased invasive capacity in response to nerve growth factor, increased adhesion to brain tissue, and increased expression of integrin alpha 3 and beta 1 subunits. Administration of the anti-beta 1 monoclonal antibody attenuated this increase in invasive and adhesive activity. Intravenous administration of ADAM9-overexpressing A549 cells to mice resulted in micrometastatic foci in the brain and multiple metastatic colonies in the lungs. In contrast, administration of parent and mock-transfected A549 cells to mice resulted in lung tumors without brain metastasis. These results suggest that ADAM9 overexpression enhances cell adhesion and invasion of non-small cell lung cancer cells via modulation of other adhesion molecules and changes in sensitivity to growth factors, thereby promoting metastatic capacity to the brain.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Shintani Y,Higashiyama S,Ohta M,Hirabayashi H,Yamamoto S,Yoshimasu T,Matsuda H,Matsuura Ndoi
10.1158/0008-5472.CAN-03-3235subject
Has Abstractpub_date
2004-06-15 00:00:00pages
4190-6issue
12eissn
0008-5472issn
1538-7445pii
64/12/4190journal_volume
64pub_type
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