4.7 Article

Ibudilast attenuates doxorubicin-induced cytotoxicity by suppressing formation of TRPC3 channel and NADPH oxidase 2 protein complexes

期刊

BRITISH JOURNAL OF PHARMACOLOGY
卷 176, 期 18, 页码 3723-3738

出版社

WILEY
DOI: 10.1111/bph.14777

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资金

  1. Ono Medical Research Foundation
  2. Smoking Research Foundation
  3. Japan Agency for Medical Research and Development [JP18am0101091]
  4. Ministry of Education, Culture, Sports, Science and Technology [26111011]
  5. Japan Society for the Promotion of Science [16H05092, 18K14921, 19H03383, 19K16363]
  6. Grants-in-Aid for Scientific Research [19K16363, 19H03383, 18K14921, 16H05092] Funding Source: KAKEN

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Background and Purpose Doxorubicin is a highly effective anticancer agent but eventually induces cardiotoxicity associated with increased production of ROS. We previously reported that a pathological protein interaction between TRPC3 channels and NADPH oxidase 2 (Nox2) contributed to doxorubicin-induced cardiac atrophy in mice. Here we have investigated the effects of ibudilast, a drug already approved for clinical use and known to block doxorubicin-induced cytotoxicity, on the TRPC3-Nox2 complex. We specifically sought evidence that this drug attenuated doxorubicin-induced systemic tissue wasting in mice. Experimental Approach We used the RAW264.7 macrophage cell line to screen 1,271 clinically approved chemical compounds, evaluating functional interactions between TRPC3 channels and Nox2, by measuring Nox2 protein stability and ROS production, with and without exposure to doxorubicin. In male C57BL/6 mice, samples of cardiac and gastrocnemius muscle were taken and analysed with morphometric, immunohistochemical, RT-PCR and western blot methods. In the passive smoking model, cells were exposed to DMEM containing cigarette sidestream smoke. Key Results Ibudilast, an anti-asthmatic drug, attenuated ROS-mediated muscle toxicity induced by doxorubicin treatment or passive smoking, by inhibiting the functional interactions between TRPC3 channels and Nox2, without reducing TRPC3 channel activity. Conclusions and Implications These results indicate a common mechanism underlying induction of systemic tissue wasting by doxorubicin. They also suggest that ibudilast could be repurposed to prevent muscle toxicity caused by anticancer drugs or passive smoking.

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