Cytotoxicity effect of trastuzumab on canine peripheral blood mononuclear cells

Document Type : Full paper (Original article)

Authors

1 Animal Medical Center, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo, 183-0054, Japan

2 Laboratory of Small Animal Surgery 2, School of Veterinary Medicine, Kitasato University, Aomori, 034-8628, Japan

10.22099/ijvr.2020.38112.5553

Abstract

Background: Trastuzumab is an antibody drug used to treat human epidermal growth factor receptor 2 (HER2) overexpressing human metastatic breast cancer. Antibody-dependent cellular cytotoxicity (ADCC) is considered to be the major mechanism of cytotoxicity of the drug. However, its ability to induce an ADCC response in canine peripheral blood mononuclear cells (PBMCs) is not well established. Aims: We aimed to evaluate the ability of trastuzumab in enhancing the cytotoxicity of PBMCs against canine tumor cells. Methods: We used canine tumor cell lines isolated from metastatic mammary gland tumors (CHMm and CIPm) and thyroid adenocarcinoma (CTAC). The binding of trastuzumab to the cells was confirmed using flow cytometry analysis. Peripheral blood mononuclear cells obtained from healthy beagles and lymphokine-activated killer (LAK) cells, generated by interleukin-2 (IL-2) stimulation of PBMCs, were used as effector cells. Standard lactate dehydrogenase (LDH) release assay was used to measure the cytotoxicity of the LAK cells against tumor cell lines in the presence of trastuzumab. Results: Trastuzumab enhanced the cytotoxicity of PBMCs against CHMm. Moreover, LAK cells killed CHMm synergistically in the presence of trastuzumab. However, the presence of trastuzumab did not produce such a synergistic effect when LAK cells acted against CIPm and CTAC. Conclusion: We confirmed the ability of trastuzumab to induce an ADCC response in canine PBMCs and determined its synergistic effect with LAK cells. Although the in vitro system in the present study did not show the induction of trastuzumab-mediated ADCC response against all canine tumor cell lines, the results of this study indicate the potential antitumor activity of trastuzumab in canines.

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