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在线翻译:
szdaily -> World -> 
Thirdhand smoke can damage one’s respiratory system: study
    2019-07-01  08:53    Shenzhen Daily

THE hazards of secondhand smoke are well-known. Now, scientists found even third-hand smoke could do harm to one’s respiratory health by changing gene expressions.

The study published in the latest edition of JAMA Network Open last week showed that thirdhand smoke can damage epithelial cells in the respiratory system, coercing those cells into a fight for survival.

The thirdhand smoke, or THS, results when the exhaled smoke and smoke emanating from the burning cigarettes settle on surfaces like clothing, hair and furniture.

The researchers from University of California, Riverside (UCR) obtained nasal scrapes from four healthy nonsmoking women aged 27 to 49 years, who were randomized to receive the clean air exposure first and then THS exposure for three hours. The researchers extracted RNA from them to examine their gene expression changes.

A total of 382 genes among approximately 10,000 genes in the data set were significantly over-expressed and seven other genes were under-expressed, according to the study.

Also, the researchers found that the inhalation altered pathways associated with oxidative stress that may cause cancer in the long term.

The nasal membrane tissue is similar to those in the bronchus, so the researchers suggested that the damage could go deeper in the respiratory system.

(SD-Agencies)

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