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20 January 2016 Intraoral Mitochondrial-Targeted GS-Nitroxide, JP4-039, Radioprotects Normal Tissue in Tumor-Bearing Radiosensitive Fancd2–/– (C57BL/6) Mice
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Abstract

We evaluated normal tissue specific radioprotection of the oral cavity in radiosensitive Fanconi Anemia (FA) Fancd2–/– mice with orally established tumors using mitochondrial-targeted GS-nitroxide (JP4-039). Adult (10–12 weeks old) Fancd2 / , Fancd2 /– and Fancd2–/– mice (C57BL/6 background) and subgroups with orally established TC-1 epithelial cell tumors received a single fraction of 28 Gy or four daily fractions of 8 Gy to the head and neck. Subgroups received JP4-039 in F15 emulsion (F15/JP4-039; 0.4 mg/mouse), 4-amino-Tempo in F15 emulsion (F15/4-amino-Tempo; 0.2 mg/mouse) or F15 emulsion alone prior to each irradiation. Oral mucosa of Fancd2–/– mice showed baseline elevated RNA transcripts for Sod2, p53, p21 and Rad51 (all P < 0.0012) and suppressed levels of Nfkb and Tgfb, (all P < 0.0020) compared with Fancd2 / mice. The oral mucosa in tumor-bearing mice of all genotypes showed decreased levels of p53 and elevated Tgfb and Gadd45a (P ≤ 0.0001 for all three genotypes). Intraoral F15/JP4-039, but not F15/4-amino-Tempo, modulated radiation-induced normal tissue transcript elevation, ameliorated mucosal ulceration and reduced the depletion of antioxidant stores in oral cavity tissue of all genotypes, but did not radioprotect tumors. Mitochondrial targeting makes F15/JP4-039 an effective normal tissue radioprotector for Fancd2–/– mice, as well as wild-type mice.

©2015 by Radiation Research Society.
Ashwin Shinde, Hebist Berhane, Byung Han Rhieu, Ronny Kalash, Karen Xu, Julie Goff, Michael W. Epperly, Darcy Franicola, Xichen Zhang, Tracy Dixon, Donna Shields, Hong Wang, Peter Wipf, Kalindi Parmar, Eva Guinan, Valerian Kagan, Vladimir Tyurin, Robert L. Ferris, Xiaolan Zhang, Song Li, and Joel S. Greenberger "Intraoral Mitochondrial-Targeted GS-Nitroxide, JP4-039, Radioprotects Normal Tissue in Tumor-Bearing Radiosensitive Fancd2–/– (C57BL/6) Mice," Radiation Research 185(2), 134-150, (20 January 2016). https://doi.org/10.1667/RR14035.1
Received: 29 January 2015; Accepted: 1 December 2015; Published: 20 January 2016
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