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Fukuo Y, Hattori Y, Kawabata S, Kashiwagi H, Kanemitsu T, Takeuchi K, Futamura G, Hiramatsu R, Watanabe T, Hu N, Takata T, Tanaka H, Suzuki M, Miyatake SI, Kirihata M, Wanibuchi M. The Therapeutic Effects of Dodecaborate Containing Boronophenylalanine for Boron Neutron Capture Therapy in a Rat Brain Tumor Model. Biology (Basel) 2020; 9:biology9120437. [PMID: 33271972 PMCID: PMC7759915 DOI: 10.3390/biology9120437] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2020] [Revised: 11/26/2020] [Accepted: 11/29/2020] [Indexed: 11/22/2022]
Abstract
Simple Summary We have developed a new boron compound for application in boron neutron capture therapy (BNCT) named boronophenylalanine–amide alkyl dodecaborate (BADB). It is characterized by a larger amount of 10B per molecule, linking boronphenylalanine (BPA) and dodecaborate, and we conducted various experiments on its efficacy. Its high accumulation at the cellular level made it a promising novel drug, but it did not sufficiently accumulate in brain tumor tissue when intravenously administered. However, in neutron irradiation experiments, the drug showed remarkably high compound biological effectiveness and significantly prolonged the survival time in rat brain tumor models. We confirmed the antitumor efficacy of BADB in BNCT and its additional efficacy when administered in combination with BPA. Though this drug showed poor results when administered as a single agent, it was superior to BPA alone when administered in combination with BPA, making it a drug that we have been waiting for in our clinical practice. Abstract Background: The development of effective boron compounds is a major area of research in the study of boron neutron capture therapy (BNCT). We created a novel boron compound, boronophenylalanine–amide alkyl dodecaborate (BADB), for application in BNCT and focused on elucidating how it affected a rat brain tumor model. Methods: The boron concentration of F98 rat glioma cells following exposure to boronophenylalanine (BPA) (which is currently being utilized clinically) and BADB was evaluated, and the biodistributions in F98 glioma-bearing rats were assessed. In neutron irradiation studies, the in vitro cytotoxicity of each boron compound and the in vivo corresponding therapeutic effect were evaluated in terms of survival time. Results: The survival fractions of the groups irradiated with BPA and BADB were not significantly different. BADB administered for 6 h after the termination of convection-enhanced delivery ensured the highest boron concentration in the tumor (45.8 μg B/g). The median survival time in the BADB in combination with BPA group showed a more significant prolongation of survival than that of the BPA group. Conclusion: BADB is a novel boron compound for BNCT that triggers a prolonged survival effect in patients receiving BNCT.
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Affiliation(s)
- Yusuke Fukuo
- Department of Neurosurgery, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki-shi, Osaka 569-8686, Japan; (Y.F.); (H.K.); (T.K.); (K.T.); (G.F.); (R.H.); (M.W.)
| | - Yoshihide Hattori
- Research Center of Boron Neutron Capture Therapy, Research Organization for the 21st Century, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai-shi, Osaka 599-8531, Japan; (Y.H.); (M.K.)
| | - Shinji Kawabata
- Department of Neurosurgery, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki-shi, Osaka 569-8686, Japan; (Y.F.); (H.K.); (T.K.); (K.T.); (G.F.); (R.H.); (M.W.)
- Correspondence: ; Tel.: +81-72-683-1221
| | - Hideki Kashiwagi
- Department of Neurosurgery, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki-shi, Osaka 569-8686, Japan; (Y.F.); (H.K.); (T.K.); (K.T.); (G.F.); (R.H.); (M.W.)
| | - Takuya Kanemitsu
- Department of Neurosurgery, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki-shi, Osaka 569-8686, Japan; (Y.F.); (H.K.); (T.K.); (K.T.); (G.F.); (R.H.); (M.W.)
| | - Koji Takeuchi
- Department of Neurosurgery, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki-shi, Osaka 569-8686, Japan; (Y.F.); (H.K.); (T.K.); (K.T.); (G.F.); (R.H.); (M.W.)
| | - Gen Futamura
- Department of Neurosurgery, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki-shi, Osaka 569-8686, Japan; (Y.F.); (H.K.); (T.K.); (K.T.); (G.F.); (R.H.); (M.W.)
| | - Ryo Hiramatsu
- Department of Neurosurgery, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki-shi, Osaka 569-8686, Japan; (Y.F.); (H.K.); (T.K.); (K.T.); (G.F.); (R.H.); (M.W.)
| | - Tsubasa Watanabe
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan; (T.W.); (T.T.); (H.T.); (M.S.)
| | - Naonori Hu
- Kansai BNCT Medical Center, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki-shi, Osaka 569-8686, Japan; (N.H.); (S.-I.M.)
| | - Takushi Takata
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan; (T.W.); (T.T.); (H.T.); (M.S.)
| | - Hiroki Tanaka
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan; (T.W.); (T.T.); (H.T.); (M.S.)
| | - Minoru Suzuki
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan; (T.W.); (T.T.); (H.T.); (M.S.)
| | - Shin-Ichi Miyatake
- Kansai BNCT Medical Center, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki-shi, Osaka 569-8686, Japan; (N.H.); (S.-I.M.)
| | - Mitsunori Kirihata
- Research Center of Boron Neutron Capture Therapy, Research Organization for the 21st Century, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai-shi, Osaka 599-8531, Japan; (Y.H.); (M.K.)
| | - Masahiko Wanibuchi
- Department of Neurosurgery, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki-shi, Osaka 569-8686, Japan; (Y.F.); (H.K.); (T.K.); (K.T.); (G.F.); (R.H.); (M.W.)
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