title: Attenuation of hyperoxia-induced lung injury in neonatal rats by 1α,25-Dihydroxyvitamin D3.
abstract: BACKGROUND
  Mounting evidence suggests that Toll-like receptor (TLRs) plays an important role in oxidative stress and is implicated in the pathogenesis of hyperoxic lung injury. 1α,25-Dihydroxyvitamin D3 (1,25(OH)2D3), the hormonally active form of vitamin D, not only plays an essential role in mineral balance, but also possesses immunomodulatory and antioxidant properties. Besides, Vitamin D3 is involved in the regulation of TLRs signaling. The present study was designed to investigate whether 1,25(OH)2D3 attenuates hyperoxia-induced lung injury by regulating TLRs signaling in neonatal rats.
  
  
  METHODS
  Pups were divided into four groups: normoxia control group (NC), normoxia plus 1,25(OH)2D3 treatment group (ND), hyperoxia control group (HC), and hyperoxia plus 1,25(OH)2D3 treatment group (HD). Lung tissues were collected for histological examination and detection of mRNA and protein expressions.
  
  
  RESULTS
  Treatment of hyperoxia-exposed animals with 1,25(OH)2D3 resulted in significantly increased body weight and reduced hyperoxia-induced lung injury. Moreover, 1,25(OH)2D3 significantly downregulated the expression of TLR4, NF-κB, and the inflammatory cytokines TNF-α, IL-1β, and IL-6.
  
  
  CONCLUSIONS
  1,25(OH)2D3 could attenuate hyperoxia-induced lung injury in neonatal rats, possibly by regulating TLR4/NF-κB signaling.
authors.affiliation: 1Pediatric, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology , Wuhan , China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Chen
authors.forename: Qiong
authors.initials: Q
authors.lastname: Li
authors.forename: Yalan
authors.initials: Y
authors.lastname: Liu
authors.forename: Li
authors.initials: L
authors.lastname: Shu
authors.forename: Na
authors.initials: N
authors.lastname: Wang
authors.forename: Yipin
authors.initials: Y
authors.lastname: Wu
authors.forename: Xue
authors.initials: X
authors.lastname: Sun
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D015536:Down-Regulation / Q000187:drug effects / Q000235:genetics; D018496:Hyperoxia / Q000235:genetics*; D053583:Interleukin-1beta / Q000235:genetics; D015850:Interleukin-6 / Q000235:genetics; D055370:Lung Injury / Q000188:drug therapy* / Q000235:genetics*; D016328:NF-kappa B / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D015398:Signal Transduction / Q000187:drug effects / Q000235:genetics; D051197:Toll-Like Receptor 4 / Q000235:genetics; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D053583:Interleukin-1beta; D015850:Interleukin-6; D016328:NF-kappa B; D012333:RNA, Messenger; C495347:Tlr4 protein, rat; D051197:Toll-Like Receptor 4; D014409:Tumor Necrosis Factor-alpha; C118756:dihydroxy-vitamin D3; D014807:Vitamin D
keywords: 1; 25-Dihydroxyvitamin D3; TLR; hyperoxia; lung injury