Novel anti-HER2 monoclonal antibodies: synergy and antagonism with tumor necrosis factor-α

BMC Cancer

Ceyhan Ceran³  Murat Cokol¹  Sultan Cingoz⁴  Ipek Tasan³  Mehmet Ozturk³  Tamer Yagci² 

[1] Biological Sciences and Bioengineering Program, Faculty of Engineering and Natural Sciences, Sabanci University, 34956, Istanbul, Turkey

[2] Faculty of Science, Department of Molecular Biology and Genetics, Gebze Institute of Technology, 41400, Kocaeli, Turkey

[3] BilGen Genetics and Biotechnology Research Center, Department of Molecular Biology and Genetics, Bilkent University, Ankara, Turkey

[4] Department of Medical Biology, Dokuz Eylul University Medical School, Izmir, Turkey

关键词: Antagonism;    Synergy;    Breast Cancer;    Growth Inhibition;    Epitope Mapping;    Monoclonal Antibodies;    TNF-α;    ERBB2;    HER2;   

Others  :  1080159
DOI  :  10.1186/1471-2407-12-450

 received in 2012-05-09, accepted in 2012-09-11,  发布年份 2012

【 摘 要 】

Background

One-third of breast cancers display amplifications of the ERBB2 gene encoding the HER2 kinase receptor. Trastuzumab, a humanized antibody directed against an epitope on subdomain IV of the extracellular domain of HER2 is used for therapy of HER2-overexpressing mammary tumors. However, many tumors are either natively resistant or acquire resistance against Trastuzumab. Antibodies directed to different epitopes on the extracellular domain of HER2 are promising candidates for replacement or combinatorial therapy. For example, Pertuzumab that binds to subdomain II of HER2 extracellular domain and inhibits receptor dimerization is under clinical trial. Alternative antibodies directed to novel HER2 epitopes may serve as additional tools for breast cancer therapy. Our aim was to generate novel anti-HER2 monoclonal antibodies inhibiting the growth of breast cancer cells, either alone or in combination with tumor necrosis factor-α (TNF-α).

Methods

Mice were immunized against SK-BR-3 cells and recombinant HER2 extracellular domain protein to produce monoclonal antibodies. Anti-HER2 antibodies were characterized with breast cancer cell lines using immunofluorescence, flow cytometry, immunoprecipitation, western blot techniques. Antibody epitopes were localized using plasmids encoding recombinant HER2 protein variants. Antibodies, either alone or in combination with TNF-α, were tested for their effects on breast cancer cell proliferation.

Results

We produced five new anti-HER2 monoclonal antibodies, all directed against conformational epitope or epitopes restricted to the native form of the extracellular domain. When tested alone, some antibodies inhibited modestly but significantly the growth of SK-BR-3, BT-474 and MDA-MB-361 cells displaying ERBB2 amplification. They had no detectable effect on MCF-7 and T47D cells lacking ERBB2 amplification. When tested in combination with TNF-α, antibodies acted synergistically on SK-BR-3 cells, but antagonistically on BT-474 cells. A representative anti-HER2 antibody inhibited Akt and ERK1/2 phosphorylation leading to cyclin D1 accumulation and growth arrest in SK-BR-3 cells, independently from TNF-α.

Conclusions

Novel antibodies against extracellular domain of HER2 may serve as potent anti-cancer bioactive molecules. Cell-dependent synergy and antagonism between anti-HER2 antibodies and TNF-α provide evidence for a complex interplay between HER2 and TNF-α signaling pathways. Such complexity may drastically affect the outcome of HER2-directed therapeutic interventions.

【 授权许可】

   
2012 Ceran et al.; licensee BioMed Central Ltd.

【 图 表 】

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