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To improve the therapeutic index, identifying effective substances for prevention or treatment of postirradiation intestinal and bone marrow injury should be prompted. This study was designed to evaluate the protective effects of cimetidine on the in rats exposed to \u03b3\u2010irradiation (5\u2009Gy) and exploring the B\u2010cell lymphoma 2 (Bcl2)\/Bcl2 associated X (bax) pathway as a probable underlying mechanism. Eighteen adult male rats were randomly grouped into three: control, untreated irradiated rats, and irradiated rats pretreated with cimetidine. Seven days postirradiation the rats were culled, the bone marrow (BM) and jejunum tissue samples were collected for biochemical, histological, and immunohistological evaluation of BM cell count (BMCs), intestinal fibrosis, oxidative stress, tumor necrosis factor\u2010\u03b1, Bcl2, and Bax. Cimetidine pretreatment significantly reversed the loss of BMCs, intestinal lining destruction, and fibrosis seen in the untreated irradiated rats and significantly decreased the underlying oxidative stress, inflammation, and Bax\/Bcl2 ratio. There was a significant differential correlation between Bax\/Bcl2 ratio, tissue oxidative stress level, and tissue injury. Cimetidine represents a very promising radioprotective agent with a potential differential beneficial effect on both cancer cells (inducing apoptosis) as previously proved through different studies and adjacent healthy cells (providing radioprotection via inhibiting apoptosis) as clearly demonstrated through this study, via its antioxidant effect and subsequent regulation of type 2 apoptotic pathway through modulation of Bax\/Bcl2 ratio.<\/jats:p>","DOI":"10.1002\/jcp.29692","type":"journal-article","created":{"date-parts":[[2020,4,23]],"date-time":"2020-04-23T15:25:42Z","timestamp":1587655542000},"page":"8495-8506","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Cimetidine a promising radio\u2010protective agent through modulating Bax\/Bcl2 ratio: An in vivo study in male rats"],"prefix":"10.1002","volume":"235","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2369-4052","authenticated-orcid":false,"given":"Suzanne","family":"Estaphan","sequence":"first","affiliation":[{"name":"Physiology Department, Faculty of Medicine Cairo University  Cairo Egypt"},{"name":"ANU Medical School, Australian National University  Canberra ACT Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Raafat","family":"Abdel\u2010Malek","sequence":"additional","affiliation":[{"name":"Clinical Oncology, Faculty of Medicine, Cairo University  Cairo Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laila","family":"Rashed","sequence":"additional","affiliation":[{"name":"Biochemistry Department, Faculty of Medicine Cairo University  Cairo Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Enas Ahmed","family":"Mohamed","sequence":"additional","affiliation":[{"name":"Department of Anatomy College of Medicine, Qassim University  Meleda KSA"},{"name":"Anatomy Department, Faculty of Medicine Cairo University  Cairo Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,4,23]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00204-008-0352-4"},{"issue":"3","key":"e_1_2_10_3_1","first-page":"198","article-title":"Effect of cimetidine and ranitidine on lipid profile and lipid peroxidation in \u03b3\u2010irradiated mice","volume":"42","author":"Ardestani S. 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