title: Melatonin prevents radiation-induced oxidative stress and periodontal tissue breakdown in irradiated rats with experimental periodontitis.
abstract: OBJECTIVE
  The aim of this study was to analyze the biochemical and histochemical effects of radiation therapy and protective melatonin administration on periodontal tissues in rats with experimental periodontitis.
  
  
  METHODS
  Sixty male Sprague Dawley rats were divided into six groups, as follows: control; experimental periodontitis (Ped); radiotherapy administration (Rt); experimental periodontitis and exposure to irradiation (Ped-Rt); radiotherapy and protective melatonin administration (Rt-Mel); and periodontitis, radiation therapy and protective melatonin administration (Ped-Rt-Mel). The rats were killed at the end of the experimental procedure, and the oxidative stress level and periodontal destruction were compared among the groups.
  
  
  RESULTS
  The oxidative stress index and the levels of 8-hydroxy-2'-deoxyguanosine, malondialdehyde and C-terminal telopeptide of type I collagen were found to be significantly higher in the Ped-Rt group compared with the Ped group (p < 0.05), and the levels were lower in the Ped-Rt-Mel group than in the Ped-Rt group (p < 0.05). Alveolar bone destruction and attachment level were also significantly lower in the Ped-Rt-Mel group than in the Ped-Rt group (p < 0.05).
  
  
  CONCLUSIONS
  It was found that radiotherapy increased oxidative stress, the periodontal attachment level and alveolar bone loss, and protective melatonin administration significantly reduced the oxidative parameters and prevented periodontal damage in irradiated rats with experimental periodontitis. Further research is needed regarding the use of systemic melatonin administration before radiation therapy.
authors: Faculty of Dentistry, Department of Periodontology, Recep Tayyip Erdogan University, Rize, Turkey.
authors: O
authors: O
authors: Köse
authors: Faculty of Dentistry, Department of Periodontology, Atatürk University, Erzurum, Turkey.
authors: T
authors: T
authors: Arabaci
authors: Faculty of Dentistry, Department of Periodontology, Pamukkale University, Denizli, Turkey.
authors: A
authors: A
authors: Kizildag
authors: Faculty of Medicine, Department of Radiation Oncology, Atatürk University, Erzurum, Turkey.
authors: B
authors: B
authors: Erdemci
authors: Faculty of Dentistry, Department of Periodontology, Atatürk University, Erzurum, Turkey.
authors: D
authors: D
authors: Özkal Eminoğlu
authors: Faculty of Veterinary Medicine, Department of Histology and Embriology, Atatürk University, Erzurum, Turkey.
authors: S
authors: S
authors: Gedikli
authors: Faculty of Veterinary Medicine, Department of Biochemistry, Atatürk University, Erzurum, Turkey.
authors: S
authors: S
authors: Özkanlar
authors: Faculty of Dentistry, Department of Periodontology, Recep Tayyip Erdogan University, Rize, Turkey.
authors: M
authors: M
authors: Zihni
authors: Department of Medical Laboratory, Health Services Vocational Training School, Atatürk University, Erzurum, Turkey.
authors: M
authors: M
authors: Albayrak
authors: Faculty of Veterinary Medicine, Department of Histology and Embriology, Atatürk University, Erzurum, Turkey.
authors: A
authors: A
authors: Kara
authors: Faculty of Dentistry, Department of Periodontology, Atatürk University, Erzurum, Turkey.
authors: E
authors: E
authors: Kermen
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D004195:Disease Models, Animal; D053583:Interleukin-1beta / Q000097:blood; D008297:Male; D008550:Melatonin / Q000494:pharmacology*; D018384:Oxidative Stress / Q000187:drug effects / Q000528:radiation effects*; D010518:Periodontitis / Q000378:metabolism* / Q000473:pathology; D010519:Periodontium / Q000378:metabolism* / Q000473:pathology; D011878:Radiotherapy / Q000009:adverse effects*; D051381:Rats; D017207:Rats, Sprague-Dawley; D014409:Tumor Necrosis Factor-alpha / Q000097:blood
chemical_list: D000975:Antioxidants; D053583:Interleukin-1beta; D014409:Tumor Necrosis Factor-alpha; D008550:Melatonin
keywords: antioxidants; experimental periodontitis; host modulation therapy; radiotherapy