Publications by authors named "Yansen Bai"

Article Synopsis
  • The study explores the relationship between pulmonary toxicity from polycyclic aromatic hydrocarbons (PAHs) and the potential modifying role of vitamin D, specifically in the context of early signs of chronic obstructive pulmonary disease (COPD).
  • Using data from the NHANES 2007-2012, the researchers analyzed how PAHs negatively impact lung function and how vitamin D levels could counteract these effects among participants, particularly those with early lung dysfunction.
  • Results indicate that higher vitamin D levels are associated with better lung function and lower risk of early lung dysfunction, suggesting that vitamin D may mediate some negative impacts of PAHs through metabolic mechanisms.
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  • The study explored the impact of exposure to various metals (iron, zinc, nickel, and lead) on cognitive function in over 6,000 middle-aged and older adults, using blood tests and cognitive assessments.
  • Results indicated that higher levels of iron and zinc correlated with better cognitive scores, while increased levels of nickel and lead led to declines in cognition, particularly in those with low zinc.
  • The findings suggest that zinc may help reduce the negative effects of nickel and lead on cognitive function, highlighting the need for more research to confirm these relationships and understand their implications for cognitive health in the elderly.
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Article Synopsis
  • - The study investigates how inflammatory (DII) and antioxidant (CDAI) dietary patterns relate to early signs of Chronic Obstructive Pulmonary Disease (COPD) and how metabolic disorders might influence these associations, using data from over 9,500 individuals in a national health survey.
  • - Results show a higher DII correlates with worse lung function and increased metabolic issues, while a higher CDAI is linked to better lung function and fewer metabolic problems, suggesting that the dietary antioxidant intake can mitigate the negative impacts of an inflammatory diet.
  • - The analysis reveals that metabolic indicators like Triglyceride-glucose index (TyG) play a role in mediating the relationships between these dietary patterns and lung function outcomes
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Mosaic loss of chromosome Y (mLOY) is the most common somatic alteration as men aging and may reflect genome instability. PM exposure is a major health concern worldwide, but its effects with genetic factors on mLOY has never been investigated. Here we explored the associations of PM and PM exposure with mLOY of 10,158 males measured via signal intensity of 2186 probes in male-specific chromosome-Y region from Illumina array data.

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Background: Polycyclic aromatic hydrocarbons (PAHs) are well-acknowledged pro-inflammatory chemicals, but their associations with blood cell-based inflammatory biomarkers need further investigation. Moreover, the effects and mechanisms of essential metals on PAH-related inflammation remain poorly understood.

Objects: To elucidate the associations of PAHs on inflammatory biomarkers, as well as the effects and mechanisms of essential metals on these associations.

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Article Synopsis
  • * Results show that higher levels of BPDE-Alb (a biomarker for BaP exposure) and polygenic risk scores (PRS) are linked to an increased risk of lung cancer, while higher zinc levels appear to reduce this risk.
  • * Notably, as zinc concentrations increase, the lung cancer risk associated with BPDE-Alb exposure decreases significantly, indicating that zinc may offer a protective effect against lung cancer resulting from BaP exposure, with
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Whether adopting healthy lifestyles and maintaining moderate levels of essential metals could attenuate the reduction of heart rate variability (HRV) related to polycyclic aromatic hydrocarbons (PAHs) exposure are largely unknown. In this study, we measured urinary metals and PAHs as well as HRV, and constructed a healthy lifestyle score in 1267 coke oven workers. Linear regression models were used to explore the association of healthy lifestyle score and essential metals with HRV, and interaction analysis was performed to investigate the potential interaction between healthy lifestyle score, essential metals, and PAHs on HRV.

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Metabolic syndrome (MetS) prevalence has increased dramatically worldwide and has become a public health issue. Polycyclic aromatic hydrocarbons (PAHs) were identified as risk factors of MetS, while essential metals are integral parts of metalloenzymes catalyzing metabolic processes. However, effects of co-exposure to PAHs and essential metals have not been investigated yet.

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Epidemiological investigations implied that mitochondrial DNA copy number (mtDNAcn) variations could trigger predisposition to multiple cancers, but evidence regarding gastrointestinal cancers (GICs) was still uncertain. We conducted a case-cohort study within the prospective Dongfeng-Tongji cohort, including incident cases of colorectal cancer (CRC, n = 278), gastric cancer (GC, n = 138), and esophageal cancer (EC, n = 72) as well as a random subcohort (n = 1173), who were followed up from baseline to the end of 2018. We determined baseline blood mtDNAcn and associations of mtDNAcn with the GICs risks were estimated by using weighted Cox proportional hazards models.

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Essential trace element zinc is associated with decreased lung cancer risk, but underlying mechanisms remain unclear. This study aimed to investigate role of DNA methylation in zinc-lung cancer association. We conducted a case-cohort study within prospective Dongfeng-Tongji cohort, including 359 incident lung cancer cases and a randomly selected sub-cohort of 1399 participants.

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Epidemiologic studies have suggested that elevated concentrations of zinc are associated with a decreased risk of lung cancer, but the underlying mechanisms remain to be investigated. The metabolites are highly sensitive to environmental stress, which will help to reveal the linkages between zinc exposure and lung cancer risk. We designed a nested case-control study including 101 incident lung cancer cases and 1:2 age- and sex-frequency-matched 202 healthy controls from the Dongfeng-Tongji (DFTJ) cohort.

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Experimental studies have suggested perfluoroalkyl substances (PFASs) as mammary toxicants, but few studies evaluated the prospective associations of PFASs with breast cancer risk. We performed a case-cohort study within the Dongfeng-Tongji cohort, including incident breast cancer cases (n = 226) and a random sub-cohort (n = 990). Baseline plasma concentrations of four perfluorinated carboxylic acids (PFCAs) [perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDA), and perfluoroheptanoic acid (PFHpA)] and two perfluorinated sulfonic acids (PFSAs) [perfluorooctane sulfonic acid (PFOS) and perfluorohexane sulfonic acid (PFHxS)] were measured.

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Background: Observational epidemiological studies have reported the associations of high body mass index (BMI) with elevated serum uric acid (UA) level and increased risk of postmenopausal breast cancer. However, whether UA is causally induced by BMI and functioned in the BMI-breast cancer relationship remains unclear.

Methods: To elucidate the causality direction between BMI and serum UA, the bidirectional Mendelian randomization (MR) analyses were performed by using summarized data from the largest Asian genome-wide association studies (GWAS) of BMI and UA carried out in over 150,000 Japanese populations.

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In view of the sex differences in aging-related diseases, sex chromosomes may play a critical role during aging process. This study aimed to identify age-related DNA methylation changes on Y chromosome (ChrY). A two-stage study design was conducted in this study.

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This study aims to establish a biological age (BA) predictor and to investigate the roles of lifestyles on biological aging. The 14,848 participants with the available information of multisystem measurements from the Dongfeng-Tongji cohort were used to estimate BA. We developed a composite BA predictor showing a high correlation with chronological age (CA) (r = 0.

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Background: Circulating white blood cell (WBC) counts have been related to lung function impairment, but causal relationship was not established. We aimed to evaluate independent effects and causal relationships of WBC subtypes with lung function.

Methods: The 19,159 participants from NHANES 2011-2012 ( = 3570), coke-oven workers (COW,  = 1762) and Dongfeng-Tongji (DFTJ,  = 13,827) cohorts were included in the observational studies.

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Article Synopsis
  • The Systemic Immune-Inflammation Index (SII) is identified as a biomarker for chronic inflammation and a predictor of mortality risks from various causes, including cancer and cardiovascular diseases (CVD).
  • In a study involving over 56,000 participants from two different cohorts, high SII levels were linked to increased mortality risks, particularly for total and CVD mortality, compared to those with low SII levels.
  • Physical activity was found to significantly reduce mortality risks associated with high SII levels, offering a protective effect of up to 59% for total and CVD mortality in the studied populations.
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Background: Body mass index (BMI) has been reported to be inversely associated with incident risk of non-small cell lung cancer (NSCLC). However, the underlying mechanism is still unclear. This study aimed to investigate the role of DNA methylation in the relationship between BMI and NSCLC.

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Benzo[a]pyrene (B[a]P) is a typical carcinogen associated with increased lung cancer risk, but the underlying mechanisms remain unclear. This study aimed to investigate epigenome-wide DNA methylation associated with B[a]P exposure and their mediation effects on B[a]P-lung cancer association in two lung cancer case-control studies of 462 subjects. Their plasma levels of benzo[a]pyrene diol epoxide-albumin (BPDE-Alb) adducts and genome-wide DNA methylations were separately detected in peripheral blood by using enzyme-linked immunosorbent assay (ELISA) and genome-wide methylation arrays.

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Background: Healthcare workers (HCWs) are at the forefront of fighting against the COVID-19 pandemic. However, they are at high risk of acquiring the pathogen from infected patients and transmitting to other HCWs. We aimed to investigate risk factors for nosocomial COVID-19 infection among HCWs in a non-COVID-19 hospital yard.

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Mosaic loss of chromosome Y (mLOY) is an indicator of genome instability, but the environmental stressors of mLOY remained largely unknown. In this study, we detected the internal exposure levels of 11 polycyclic aromatic hydrocarbon (PAH) metabolites and 22 metals among 888 coke-oven workers, and calculated their blood mLOY based on genome-wide SNP genotyping data and presented as median log R ratio (mLRR-Y). The generalized linear model (GLM), LASSO, and Bayesian kernel machine regression (BKMR), were used to select mLOY-relevant chemicals.

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Background: Arsenic (As) is an established toxic metal, but its effect on longitudinal lung function change among occupational workers is less conclusive.

Methods: 1243 participants were recruited in a coke-oven plant and followed up from 2010 to 2014. Each individual provided 20 mL morning urine sample at baseline, which was then used for urinary levels of As (U-As) and polycyclic aromatic hydrocarbon (PAH) metabolites detecting.

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