Abstract：
:Ras is a major signaling molecule activated by interleukin-6. There have been no published reports, however, that specifically examine the kinetics and percentage of Ras activation in response to IL-6. Model cell lines were used to study activation of N- and K-ras induced by IL-6. All of the myeloma cell lines we tested express both N-ras and K-ras, but not H-ras. GTP-bound Ras was measured and the percentage of the total Ras pool that was activated in response to IL-6 was calculated. IL-6 is able to transiently activate both N- and K-ras in the ANBL6 cell line. In addition, increasing concentrations of IL-6 are able to activate increasing levels of both N- and K-ras. One ng/ml of IL-6 is able to activate approximately 10% of the N-ras pool and 18% of the K-ras pool. The amount of Ras-GTP in the cells correlates with the level of proliferation at low levels, but proliferation plateaus when higher levels of Ras-GTP are present. Protection from dexamethasone-induced apoptosis correlates with IL-6 concentration and Ras activation. However, IL-6 enhances apoptosis induced by doxorubicin. Interestingly, the ANBL6 cell line transfected with an N-ras12 or a K-ras12 gene is protected from doxorubicin-induced apoptosis.
journal_name
Oncogenejournal_title
Oncogeneauthors
Rowley M,Van Ness Bdoi
10.1038/sj.onc.1205387subject
Has Abstractpub_date
2002-12-12 00:00:00pages
8769-75issue
57eissn
0950-9232issn
1476-5594journal_volume
21pub_type
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