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- W2967960092 abstract "5099 Melanoma is notorious for affecting young and middle-aged people, unlike most other solid tumors, which mainly affect older adults. Therapy for early disease is primarily surgery, with a minor benefit noted with adjuvant therapy; however, there is no effective treatment for advanced disease because of lack of effective treatment modalities. CXCL-8, a member of the CXC chemokine family, is constitutively expressed in malignant melanoma and functions as an autocrine/paracrine growth, invasive and angiogenic factor. Our recent data demonstrate that modulation of CXCR1 or CXCR2 expression in melanoma cells regulates CXCL-8-dependent growth, angiogenesis and motility. The precise functional significance of these receptors in malignant melanoma growth and angiogenesis is hitherto unclear. Thus, theobjective of this study is to determine the functional roles of CXCR1 and CXCR2 in CXCL-8-dependent melanoma growth and angiogenesis. We knocked-down CXCR1 or CXCR2 expression by using mammalian expression vectors (pSuper.neo) constitutively expressing short hairpin (sh)RNA for CXCR1 or CXCR2. A375SM malignant melanoma cells were transfected with pCXCR1-sh1 or pCXCR2-sh1 and were stably selected and analyzed for CXCR1 and CXCR2 expression. We observed a significant decrease in CXCR1 and CXCR2 expression in A375SM-CXCR1sh1 and A375SM-CXCR2sh1 knock-down cells respectively, compared to control cells. We examined whether knock-down of CXCR1 or CXCR2 modulates cellular phenotypes associated with melanoma growth, angiogenesis and metastasis. We observed decreases in CXCL-8 induced cell proliferation, survival, chemotaxis, invasion and actin reorganization in melanoma cells knocked-down for CXCR1 or CXCR2 as compared to control cells. Furthermore, when A375SM-CXCR1sh1, A375SM-CXCR2sh1 and A375SM-control cells were injected subcutaneously into nude mice, tumor growth was significantly inhibited in both A375SM-CXCR1sh1, A375SM-CXCR2sh1 tumors compared to control tumors. In addition, we observed a significant decrease in cell proliferation, survival and neovascularization in CXCR1 or CXCR2 knock-down tumors as compared to control tumors. In conclusion, our study provides experimental evidence that supports the functional significance of CXCR1 and CXCR2 in the regulation of human malignant melanoma and in addition, suggests the development of strategies that target both receptors." @default.
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- W2967960092 date "2008-05-01" @default.
- W2967960092 modified "2023-09-23" @default.
- W2967960092 title "CXCR1 or CXCR2 knock-down inhibits cellular proliferation, survival, motility and tumor growth in human malignant melanoma" @default.
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