We are conducting chemical biology research for the elucidation of biological functions and pathological conditions based on organic chemistry. Our goal is the discovery of new targets and innovative drug seeds for drug development in refractory diseases such as cancer and neurodegenerative diseases. In particular, we are pursuing to develop novel cancer therapeutic drugs targeting adaptive response systems against oxidative stress, hypoxia and endoplasmic reticulum stress accelerated in the tumor microenvironment. As a result, we succeeded in obtaining promising leads having potent antitumor activity by structural development of bicyclic peptide scaffold based on medium size molecules drug discovery. Furthermore, novel iron (II) selective fluorescent probes targeted to various intracellular organelles were developed. They are useful for the study of refractory diseases such as cancer and neurodegenerative diseases based on the disruption of iron homeostasis. We also developed a near infrared fluorescent probe targeting hypoxic cancer and succeeded in vivo imaging of tumor hypoxia for the first time.
研究課題 Research Objectives
がん微小環境を標的とするがん治療薬の開発とがんのケミカルバイオロジー研究 Anticancer drug development targeting the tumor microenvironment and cancer chemical biology
細胞内ストレス応答の研究のための分子プローブの開発 Development of molecular probes for the study of cellular stress responses
鉄(II)イオン検出分子の開発を基盤とする生体内鉄代謝機構解明研究 Study on iron metabolism in living organisms based on the development of Fe (II) fluorescent probe
最近の研究成果 Research Publications
Tsuji, M., Taira, H., Udagawa, T., Aoki, T., Hirayama, T., and Nagasawa, H. Synthesis and photochemical properties of caged peroxides for photocontrol of cellular oxidative stress. Chem. Commun., 59, 6706-6709 (2023).
Kawai, K., Hirayama, T.*, Imai, H., Murakami, T., Inden, M., Hozumi, I., Nagasawa, H. Molecular Imaging of Labile Heme in Living Cells Using a Small Molecule Fluorescent Probe. J. Am. Chem. Soc., 144, 3793-3803(2022).
Sakai, T., Matsuo, Y., Okuda, K., Hirota, K., Tsuji, M., Hirayama, T., Nagasawa, H. Development of Antitumor Biguanides Targeting Energy Metabolism and Stress Responses in the Tumor Microenvironment. Sci. Rep., 11, Art. No. 4852 (2021).
Mukaimine, A., Hirayama, T., Nagasawa, H. Synthesis, Photophysical Properties, and Application of Asymmetric Bismuth-Rhodamines as an Activatable Fluorogenic Photosensitizer. Org. Biomol. Chem., 19, 3611-3619(2021).
Koike, K., Nagano, M., Ebihara, M., Hirayama, T., Tsuji, M., Suga, H., Nagasawa, H., Design, Synthesis, and Conformation-Activity Study of Unnatural Bridged Bicyclic Depsipeptides as Highly Potent HIF-1 Inhibitors and Antitumor Agents. J. Med. Chem., 63(8), 4022-4046 (2020).