Abstract：
:Brain metastasis is a major cause of morbidity and mortality in patients with melanoma. The molecular changes that lead to brain metastasis remain poorly understood. In this study, we developed a model to study human melanoma brain metastasis and found that Stat3 activity was increased in human brain metastatic melanoma cells when compared with that in cutaneous melanoma cells. The expression of activated Stat3 is also increased in human brain metastasis specimens when compared with that in the primary melanoma specimens. Increased Stat3 activation by transfection with a constitutively activated Stat3 enhanced brain metastasis, whereas blockade of Stat3 activation by transfection with a dominant-negative Stat3 suppressed brain metastasis of human melanoma cells in animal models. Furthermore, altered Stat3 activity profoundly affected melanoma angiogenesis in vivo and melanoma cell invasion in vitro and significantly affected the expression of basic fibroblast growth factor (bFGF), vascular endothelial growth factor (VEGF), and matrix metalloproteinase-2 (MMP-2) in vivo and in vitro. Finally, Stat3 activity transcriptionally regulated the promoter activity of bFGF in addition to VEGF and MMP-2 in human melanoma cells. These results indicated that Stat3 activation plays an important role in dysregulated expression of bFGF, VEGF, and MMP-2 as well as angiogenesis and invasion of melanoma cells and contributes to brain metastasis of melanoma. Therefore, Stat3 activation might be a new potential target for therapy of human melanoma brain metastases.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Xie TX,Huang FJ,Aldape KD,Kang SH,Liu M,Gershenwald JE,Xie K,Sawaya R,Huang Sdoi
10.1158/0008-5472.CAN-05-2674subject
Has Abstractpub_date
2006-03-15 00:00:00pages
3188-96issue
6eissn
0008-5472issn
1538-7445pii
66/6/3188journal_volume
66pub_type
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