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However, there is morbidity associated with I-131 therapy, which can result in both acute and chronic complications. Currently, there are no approved radioprotectors that can be used in conjunction with I-131 to reduce complications in thyroid cancer therapy. It is well known that the damaging effects of ionizing radiation are mediated, in part, by the formation of reactive oxygen species (ROS). A potent scavenger of ROS, Mn(III)<jats:italic>meso<\/jats:italic>-tetrakis(<jats:italic>N<\/jats:italic>\u2013<jats:italic>n<\/jats:italic>-butoxyethylpyridinium-2-yl)porphyrin (MnTnBuOE-2-PyP), has radioprotective and anti-tumor effects in various cancer models including head and neck, prostate, and brain tumors exposed to external beam radiation therapy. Female C57BL\/6 mice were administered I-131 orally at doses of 0.0085\u20130.01\u00a0mCi\/g (3.145\u2009\u00d7\u200910<jats:sup>5<\/jats:sup> to 3.7\u2009\u00d7\u200910<jats:sup>5<\/jats:sup>\u00a0Bq) of body weight with or without MnTnBuOE-2-PyP. We measured acute external inflammation, blood cell counts, and collected thyroid tissue and salivary glands for histological examination. We found oral administration of I-131 caused an acute decrease in platelets and white blood cells, caused facial swelling, and loss of thyroid and salivary tissues. However, when MnTnBuOE-2-PyP was given during and after I-131 administration, blood cell counts remained in the normal range, less facial inflammation was observed, and the salivary glands were protected from radiation-induced killing. These data indicate that MnTnBuOE-2-PyP may be a potent radioprotector of salivary glands in thyroid cancer patients receiving I-131 therapy.<\/jats:p>","DOI":"10.1007\/s00411-019-00820-2","type":"journal-article","created":{"date-parts":[[2019,11,14]],"date-time":"2019-11-14T09:02:58Z","timestamp":1573722178000},"page":"99-109","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["MnTnBuOE-2-PyP treatment protects from radioactive iodine (I-131) treatment-related side effects in thyroid cancer"],"prefix":"10.1007","volume":"59","author":[{"given":"Anery","family":"Patel","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elizabeth A.","family":"Kosmacek","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kurt W.","family":"Fisher","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Whitney","family":"Goldner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0391-142X","authenticated-orcid":false,"given":"Rebecca E.","family":"Oberley-Deegan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,11,14]]},"reference":[{"issue":"12","key":"820_CR1","doi-asserted-by":"publisher","first-page":"1802","DOI":"10.1016\/j.archoralbio.2015.09.014","volume":"60","author":"MD Acauan","year":"2015","unstructured":"Acauan MD, Figueiredo MA, Cherubini K, Gomes AP, Salum FG (2015) Radiotherapy-induced salivary dysfunction: structural changes, pathogenetic mechanisms and therapies. 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