In vitro assessment of the effects of anti-HER2 monoclonal antibodies on proliferation of HER2-overexpressing breast cancer cells.

Abstract

BACKGROUND:

HER2 proto-oncogene is critical in the biology of breast cancer and an important therapeutic target of monoclonal antibodies (mAbs). We have recently established a panel of anti-HER2 mAbs recognizing different epitopes within the extracellular domain of HER2.

MATERIALS & METHODS:

In the present study the antiproliferative effect of these mAbs was investigated on HER2-overexpressing human breast cancer cell line BT474, using radioactive thymidine incorporation assay.

RESULTS:

Our results demonstrated that while two of the mAbs (1T0 and 2A8) inhibited cell proliferation dose dependently, similar to trastuzumab, six mAbs (1F2, 1B5, 1H9, 4C7, 1H6 and 2A9) augmented cell proliferation. Treatment of BT474 cells with different combinations of two mAbs induced either synergistic inhibitory or stimulatory effects.

DISCUSSION:

Our findings indicate that combination of some stimulatory mAbs could completely abolish the inhibitory effect of other mAbs against HER2. Employment of some combinations of mAbs with significant synergistic inhibitory function may improve the therapeutic efficacy of HER2-specific mAbs.

• Authors: Fathollah Tahmasebi, Tohid Kazemi, Mohammad Mehdi Amiri, Jalal Khoshnoodi, Jafar Mahmoudian, Ali Ahmad Bayat, Mahmood Jeddi-Tehrani, Hodjatallah Rabbani, Fazel Shokri
• Journal: Immunotherapy (Immunotherapy) Vol. 6 Issue 1 Pg. 43-9 ( 2014) ISSN: 1750-7448 [Electronic] England
• PMID: 24341883 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Antibodies, Monoclonal
• Antibodies, Monoclonal, Humanized
• Antineoplastic Agents
• Epitopes
• MAS1 protein, human
• Proto-Oncogene Mas
• ERBB2 protein, human
• Receptor, ErbB-2
• Trastuzumab

Topics

• Animals
• Antibodies, Monoclonal (immunology, isolation & purification, pharmacology)
• Antibodies, Monoclonal, Humanized (pharmacology)
• Antineoplastic Agents (isolation & purification, pharmacology)
• Breast Neoplasms (drug therapy, pathology)
• Cell Line, Tumor
• Cell Proliferation (drug effects)
• Epitopes (immunology)
• Female
• Humans
• Mice
• Mice, Inbred BALB C
• Proto-Oncogene Mas
• Receptor, ErbB-2 (antagonists & inhibitors, genetics, immunology)
• Trastuzumab