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Anti-proliferative action of IL-6R-targeted antibody tocilizumab for non-small cell lung cancer cells #MMPMID26137057
KIM NH; KIM SK; KIM DS; ZHANG D; PARK JA; YI H; KIM JS; SHIN HC
Oncol Lett 2015[May]; 9 (5): 2283-8 PMID26137057show ga
In the present study we analyzed the anti-proliferative effect of tocilizumab, a humanized recombinant monoclonal interleukin 6 receptor (IL-6R) antibody, against non-small cell lung cancer (NSCLC) cells, including A549, H460, H358 and H1299 cells. The cell cycle distribution of NSCLCs was analyzed using fluorescence-activated cell sorting and gene expression using quantitative polymerase chain reaction. Cell lysates treated with tocilizumab were immunoblotted with antibodies against signal transducer and activator of transcription 3 (STAT3), phospho-STAT3, extracellular-signal-regulated kinases (ERK), phospho-ERK, nuclear factor ?B (NF?B) and phospho-NF?B. Significant growth inhibition of NSCLC cells was observed following treatment with tocilizumab. Proliferation was significantly decreased by approximately 10?40% in A549, H460, H1299 and H358 cells, with an inhibition rate that was comparable with that of the typical anticancer drugs methotrexate and 5-fluorouracil. NSCLC cell populations were accumulated in the sub-G1 phase by treatment with tocilizumab. Western blot analyses revealed a possible activation of the NF?B pathway by tocilizumab. Overall, these data indicate that tocilizumab has anticancer potency via apoptosis induction as an agonistic IL-6R regulator. Therefore, we suggest that this anti-IL-6R antibody may be utilized as a new targeting molecule for NSCLC therapies.