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Detection of p16 promoter methylation in premature rats with chronic lung disease induced by hyperoxia
Author(s) -
Yue Xiaohong,
Fu Jianhua,
Xue Xindong,
Gao Hong,
Liu Dongyan,
Zong Zhihong,
Wang Wei,
Li Hui,
Yuan Zhengwei
Publication year - 2010
Publication title -
pediatrics international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.49
H-Index - 63
eISSN - 1442-200X
pISSN - 1328-8067
DOI - 10.1111/j.1442-200x.2010.03089.x
Subject(s) - hyperoxia , methylation , dna methylation , medicine , messenger rna , western blot , lung , polymerase chain reaction , reverse transcription polymerase chain reaction , real time polymerase chain reaction , lung disease , microbiology and biotechnology , andrology , cancer research , gene expression , biology , gene , genetics
Background: The aim of the present study was to investigate p16 promoter methylation in premature rats with chronic lung disease (CLD) induced by hyperoxia. Methods: Eighty Wistar rats were randomized into the hyperoxia group (fraction of inspired oxygen [FiO 2 ]= 900 mL/L) or the control group (FiO 2 = 210 mL/L), 40 for each group. Semi‐nested methylation‐specific polymerase chain reaction (sn‐MSP) was applied to detect p16 promoter hypermethylation in lung tissues. Additionally, p16 mRNA and protein expression was detected on reverse transcription–polymerase chain reaction (RT‐PCR), western blot and the strept actividin–biotin complex method. Results: Extended exposure to hyperoxia led to increased methylation, and the methylation level reached a peak in the period of maximum pulmonary fibrosis in the hyperoxia group, while the methylation did not occur in the control group. The methylation rates on semi‐nested PCR (sn‐PCR) and nested‐MSP were, respectively, 52.5% and 42.5% in the hyperoxia group. There was no statistically significant difference between the two methods. The p16 mRNA and protein expression was significantly higher in those with p16 promoter hypermethylation than those without. Conclusion: Exposure to hyperoxia may induce p16 promoter hypermethylation in lung tissues in premature rats, and methylation risk increases as exposure extends. p16 promoter methylation induced by hyperoxia may be one of the mechanisms for low p16 mRNA and protein expression.