Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Inhibition of Interleukin-6 (IL-6) Signaling and Tumor Growth by a Human Neutralizing Anti-IL-6 Antibody with a Prolonged Half-Life

ABSTRACT: Interleukin-6 (IL-6) is a pleiotropic cytokine that plays a major role in responding to injury or infection as well as immune response, inflammation, and hematopoiesis. High levels of circulating IL-6 are observed in many tumor types and are associated with poor outcomes. We show that knockdown of IL-6 or IL-6 receptor (IL-6R) inhibits IL-6 signaling and cell viability. In contrast, over-expression of IL-6 enhances tumor growth in vitro and in vivo, thereby supporting the role of IL-6 in tumorigenesis. We developed a human monoclonal antibody against human IL-6 (MEDI5117) that bears Fc mutations (YTE) to extend its half-life. We tested this antibody in several cancer cell lines that secrete high levels of IL-6, soluble IL-6R, and express gp130. High constitutive pSTAT3 (phosphorylated signal transducer and activator of transcription 3) activation is seen in several of these cell lines, suggesting autocrine growth stimulation by IL-6. Treating these cell lines with MEDI5117 effectively blocked phosphorylation of STAT3 and inhibited IL-6-induced cell proliferation. In vivo, MEDI5117 suppressed the growth of multiple cancer xenograft models and specifically modulated IL-6 signaling and downstream gene expression. Combining MEDI5117 with chemotherapy or gefitinib demonstrated significantly enhanced anti-tumor activities in vivo. Taken together, our data suggest that IL-6 signaling contributes to tumor growth, thereby supporting the development of MEDI5117 as a therapy to treat solid tumors. Xenograft tumors from DU145, KPL4, and NCI-H1650 were treated with 30 mg/kg of MEDI5117 or IgG isotype control IgG1 for a total of two doses. Differentially expressed genes were identified and canonical pathway enrichment analysis was performed

ORGANISM(S): Homo sapiens

SUBMITTER: Zheng Liu

PROVIDER: E-GEOD-62941 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

ACCESS DATA

Similar Datasets

Project description:Introduction: Mammalian target of rapamycin (mTOR) represents a key downstream intermediate for a myriad of oncogenic receptor tyrosine kinases. In the case of the insulin-like growth factor (IGF) pathway, the mTOR complex (mTORC1) mediates IGF-1 receptor (IGF-1R)-induced estrogen receptor alpha (ERÎ±) phosphorylation/activation and leads to increased proliferation and growth in breast cancer cells. As a result, the prevalence of mTOR inhibitors combined with hormonal therapy has increased in recent years. Conversely, activated mTORC1 provides negative feedback regulation of IGF signaling via insulin receptor substrate (IRS)-1/2 serine phosphorylation and subsequent proteasomal degradation. Thus, the IGF pathway may provide escape (e.g. de novo or acquired resistance) from mTORC1 inhibitors. It is therefore plausible that combined inhibition of mTORC1 and IGF-1R for select subsets of ER-positive breast cancer patients presents as a viable therapeutic option. Methods: Using hormone-sensitive breast cancer cells stably transfected with the aromatase gene (MCF-7/AC-1), works presented herein describe the in vitro and in vivo antitumor efficacy of the following compounds: dalotuzumab (DALO; âMK-0646â; anti-IGF-1R antibody), ridaforolimus (RIDA; âMK-8669â; mTORC1 small molecule inhibitor) and letrozole (âLETâ, aromatase inhibitor). Results: With the exception of MK-0646, all single agent and combination treatment arms effectively inhibited xenograft tumor growth, albeit to varying degrees. Correlative tissue analyses revealed MK-0646 alone and in combination with LET induced insulin receptor alpha A (InsR-A) isoform upregulation (both mRNA and protein expression), thereby further supporting a triple therapy approach. Conclusion: These data provide preclinical rationalization towards the combined triple therapy of LET plus MK-0646 plus MK-8669 as an efficacious anti-tumor strategy for ER-positive breast tumors. 46 samples, 28 days post treatment

Dataset Information

Inhibition of Interleukin-6 (IL-6) Signaling and Tumor Growth by a Human Neutralizing Anti-IL-6 Antibody with a Prolonged Half-Life

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets