Human melanoma cells expressing V600E B-RAF are susceptible to IGF1R targeting by small interfering RNAs.
The type 1 insulin-like growth factor receptor (IGF1R) is overexpressed by malignant melanomas compared with benign naevi, and mediates proliferation, motility and protection from apoptosis. However, the utility of IGF1R targeting as anti-cancer therapy may be limited by activating mutations in down...
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| Format: | Journal article |
| Language: | English |
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2006
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| _version_ | 1797076610003763200 |
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| author | Yeh, A Bohula, E Macaulay, V |
| author_facet | Yeh, A Bohula, E Macaulay, V |
| author_sort | Yeh, A |
| collection | OXFORD |
| description | The type 1 insulin-like growth factor receptor (IGF1R) is overexpressed by malignant melanomas compared with benign naevi, and mediates proliferation, motility and protection from apoptosis. However, the utility of IGF1R targeting as anti-cancer therapy may be limited by activating mutations in downstream signaling intermediates. We previously showed that IGF1R knockdown blocked survival of prostate cancer cells in which Akt activation was deregulated by PTEN loss. The current study investigated effects of IGF1R targeting in cells harboring activating RAS-RAF mutations, found in 70-80% of human melanomas. We assembled a panel of eight human melanoma cell lines: two expressing wild-type (WT) B-RAF and N-RAS, two with activating N-RAS mutations and four harboring V600E B-RAF. We also generated isogenic cell populations overexpressing WT or V600E B-RAF. Cells expressing V600E B-RAF were relatively resistant to apoptosis. However, IGF1R gene silencing was capable of inducing significant inhibition of survival, enhancement of apoptosis, and approximately two-fold sensitization to cisplatin and temozolomide. These effects were independent of mutation status and were associated with reduced activation of Akt and also, unexpectedly, of ERKs. These results support development of IGF1R targeting as therapy for melanoma, regardless of the presence of activating mutations in the RAS-RAF pathway. |
| first_indexed | 2024-03-07T00:06:09Z |
| format | Journal article |
| id | oxford-uuid:779a15fb-98e5-4bd7-bd07-bb24a70c1a0d |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:06:09Z |
| publishDate | 2006 |
| record_format | dspace |
| spelling | oxford-uuid:779a15fb-98e5-4bd7-bd07-bb24a70c1a0d2022-03-26T20:25:13ZHuman melanoma cells expressing V600E B-RAF are susceptible to IGF1R targeting by small interfering RNAs.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:779a15fb-98e5-4bd7-bd07-bb24a70c1a0dEnglishSymplectic Elements at Oxford2006Yeh, ABohula, EMacaulay, VThe type 1 insulin-like growth factor receptor (IGF1R) is overexpressed by malignant melanomas compared with benign naevi, and mediates proliferation, motility and protection from apoptosis. However, the utility of IGF1R targeting as anti-cancer therapy may be limited by activating mutations in downstream signaling intermediates. We previously showed that IGF1R knockdown blocked survival of prostate cancer cells in which Akt activation was deregulated by PTEN loss. The current study investigated effects of IGF1R targeting in cells harboring activating RAS-RAF mutations, found in 70-80% of human melanomas. We assembled a panel of eight human melanoma cell lines: two expressing wild-type (WT) B-RAF and N-RAS, two with activating N-RAS mutations and four harboring V600E B-RAF. We also generated isogenic cell populations overexpressing WT or V600E B-RAF. Cells expressing V600E B-RAF were relatively resistant to apoptosis. However, IGF1R gene silencing was capable of inducing significant inhibition of survival, enhancement of apoptosis, and approximately two-fold sensitization to cisplatin and temozolomide. These effects were independent of mutation status and were associated with reduced activation of Akt and also, unexpectedly, of ERKs. These results support development of IGF1R targeting as therapy for melanoma, regardless of the presence of activating mutations in the RAS-RAF pathway. |
| spellingShingle | Yeh, A Bohula, E Macaulay, V Human melanoma cells expressing V600E B-RAF are susceptible to IGF1R targeting by small interfering RNAs. |
| title | Human melanoma cells expressing V600E B-RAF are susceptible to IGF1R targeting by small interfering RNAs. |
| title_full | Human melanoma cells expressing V600E B-RAF are susceptible to IGF1R targeting by small interfering RNAs. |
| title_fullStr | Human melanoma cells expressing V600E B-RAF are susceptible to IGF1R targeting by small interfering RNAs. |
| title_full_unstemmed | Human melanoma cells expressing V600E B-RAF are susceptible to IGF1R targeting by small interfering RNAs. |
| title_short | Human melanoma cells expressing V600E B-RAF are susceptible to IGF1R targeting by small interfering RNAs. |
| title_sort | human melanoma cells expressing v600e b raf are susceptible to igf1r targeting by small interfering rnas |
| work_keys_str_mv | AT yeha humanmelanomacellsexpressingv600ebrafaresusceptibletoigf1rtargetingbysmallinterferingrnas AT bohulae humanmelanomacellsexpressingv600ebrafaresusceptibletoigf1rtargetingbysmallinterferingrnas AT macaulayv humanmelanomacellsexpressingv600ebrafaresusceptibletoigf1rtargetingbysmallinterferingrnas |