Daily Respiratory Research Analysis
Analyzed 140 papers and selected 3 impactful papers.
Summary
Analyzed 140 papers and selected 3 impactful articles.
Selected Articles
1. Distinctive respiratory toxicity induced by hypoxanthine metabolic disorder from polystyrene microplastics and nanoplastics at environmentally relevant doses: multi-omics insights and experimental validation.
This mechanistic study shows that 20 nm polystyrene nanoplastics accumulate more in cells and lungs than 1 μm microplastics and provoke pronounced lung inflammation and histopathology. Multi-omics and molecular analyses identify upregulation of IGF2R, reduction of hypoxanthine, and a disruptive IGF2R–HPRT interaction as a specific mechanism for PS‑NP toxicity.
Impact: Provides novel mechanistic evidence that nanoscale plastics cause distinct metabolic disruption (hypoxanthine pathway) and more severe lung injury than microplastics, informing toxicology and regulation of airborne plastic particles.
Clinical Implications: Direct clinical impact is limited at present, but findings raise concern about inhalational exposure to nanoplastics and support human exposure assessment, biomonitoring (hypoxanthine/IGF2R-related biomarkers), and translational studies linking environmental nanoplastic exposure to respiratory disease.
Key Findings
- PS‑NPs (20 nm) accumulate more via endocytosis than PS‑MPs (1 μm) in vitro and in vivo.
- PS‑NP exposure causes pronounced lung histopathology and inflammatory responses in mice; PS‑MPs do not produce the same degree of damage.
- Multi-omics identified IGF2R upregulation and hypoxanthine depletion; IGF2R directly interacts with HPRT disrupting hypoxanthine metabolism, representing a specific molecular initiating event for PS‑NP toxicity.
Methodological Strengths
- Integrated multi-omics (proteomics, metabolomics) with in vitro and in vivo validation.
- Combination of molecular dynamics, co-immunoprecipitation, and histopathology provides mechanistic depth linking molecular events to organ-level injury.
Limitations
- Exposure concentrations used for in vitro experiments are higher than typical human inhalation exposure estimates, limiting direct extrapolation.
- Mouse model and acute/subacute exposures may not capture chronic low-dose human exposures and susceptibility differences across populations.
Future Directions: Quantify human-relevant inhalation exposure and longitudinal low-dose studies; validate hypoxanthine/IGF2R biomarkers in human biomonitoring; investigate susceptibility in vulnerable populations and chronic exposure models.
Microplastics (MPs) and nanoplastics (NPs) are pervasive environmental contaminants, raising concerns about their potential to cause inflammation, oxidative stress, and lung injury through respiratory toxicity. Due to their smaller size, larger surface area, and greater reactivity, NPs may pose a greater risk than MPs, yet size-dependent toxicity mechanisms remain unclear. This study investigates the distinct early molecular initiating events and toxicological effects of 1 μm polystyrene MPs (PS-MPs) and 20 nm polystyrene NPs (PS-NPs). Based on the internal exposure dose estimated from Py-GC/MS analysis, in vitro exposure concentrations were set at 0, 62.5, 125, 250, 500, and 1000 μg/mL. Multi-omics sequencing and integrative analysis identify specific proteomic and metabolomic alterations. Molecular dynamics simulations and co-immunoprecipitation assays elucidate binding interactions between PS-NPs-induced proteins and metabolic enzymes. In vitro and in vivo experiments reveal a greater accumulation of PS-NPs through endocytosis compared to PS-MPs; while pronounced histopathological damage with inflammatory response in mice lungs were only induced by PS-NPs, rather than PS-MPs. Compared to control group, PS-MPs partly caused proteomic or metabolomic perturbations, while PS-NPs induced significant differential expression of more extensive proteins and metabolites. PS-NPs exposure specifically upregulates insulin-like growth factor 2 receptor (IGF2R) expression and reduces Hypoxanthine levels when compared with PS-MPs. IGF2R directly interacts with Hypoxanthine-guanine phosphoribosyl transferase (HPRT), a key enzyme in Hypoxanthine metabolism, causing its disruption. This study provides important insights into the comparative toxic effects between PS-NPs with PS-MPs, especially the unique toxicological mechanisms of PS-NPs, thereby advancing the understanding of airborne plastic pollutant risks and supporting future regulatory assessments.
2. Deep-Learning Algorithm Diagnostic Support for Usual Interstitial Pneumonia Pattern Recognition in Fibrotic Interstitial Lung Disease.
In a large international reader study (312 reviewers; 203 HRCTs), providing SOFIA deep-learning outputs improved inter-observer agreement for definite UIP and enhanced prognostic accuracy. The tool standardized HRCT-based UIP classification across radiologists and pulmonologists.
Impact: UIP categorization drives antifibrotic therapy decisions and trial eligibility; reducing reader variability with validated AI can directly improve diagnostic consistency and prognostic stratification.
Clinical Implications: Clinicians and radiologists can incorporate SOFIA outputs into HRCT review to harmonize UIP classification and strengthen multidisciplinary decisions, potentially improving patient selection for antifibrotics and trials.
Key Findings
- Providing SOFIA outputs improved inter-observer agreement for definite UIP from moderate to good.
- Prognostic accuracy of clinicians’ HRCT assessments improved after SOFIA assistance.
- The study engaged 312 reviewers from 49 countries evaluating 203 HRCT scans, spanning pulmonologists and radiologists.
Methodological Strengths
- Large, international, multi-specialty reader cohort with pre/post within-reviewer assessment.
- Evaluation focused on both diagnostic agreement and prognostic accuracy, aligning with clinical decision needs.
Limitations
- Non-randomized pre/post design may introduce anchoring or learning effects.
- Patient-level outcomes and external validation in real-time clinical workflows were not assessed.
Future Directions: Randomized or stepped-wedge implementation trials integrating SOFIA into MDT workflows should test effects on treatment selection, time-to-diagnosis, and patient outcomes.
BACKGROUND AND OBJECTIVE: High resolution computed tomography (HRCT) scan diagnostic classification for usual interstitial pneumonia (UIP) plays a critical role in therapeutic decision-making and clinical trial eligibility for interstitial lung disease (ILD) patients, but is subject to variability. A deep learning algorithm, the Systematic Objective Fibrotic Imaging Analysis Algorithm (SOFIA), has been validated to assist classification of HRCTs based on current guidelines. In this study, we evaluate the impact of SOFIA on inter-observer agreement for UIP classification and prognostic accuracy of clinicians' assessment of ILD HRCTs. METHODS: Radiologists and pulmonologists (reviewers) were invited to evaluate 203 HRCTs from a national fibrotic ILD registry, scoring each of four UIP categories (definite UIP, probable UIP, indeterminate, or alternative diagnosis). SOFIA outputs were then provided, and reviewers were able to reevaluate their scores. Changes in interobserver agreement for UIP classification and prognostic accuracy were calculated. RESULTS: Three hundred twelve reviewers (120 radiologists, 192 pulmonologists) from 49 countries evaluated 203 HRCT scans. Following SOFIA, inter-observer diagnostic agreement improved for definite UIP from moderate to good (ICC CONCLUSION: Providing SOFIA algorithm output to clinicians reviewing HRCT scans improved diagnostic agreement and prognostic accuracy for fibrotic ILD. SOFIA may be a useful automated assistive tool to support improved diagnostic consistency.
3. Associations between maternal blood lead concentration during pregnancy and trajectories of wheezing and asthma in offspring: The Japan Environment and Children's Study (JECS).
Large prospective JECS cohort (87,041 dyads) found that higher maternal blood lead during pregnancy, even at contemporary low levels (median ≈0.6 μg/dL), is associated with greater likelihood of transient-early and persistent wheeze trajectories and persistent asthma in offspring up to age 4.
Impact: Provides robust population-level evidence that even low maternal Pb levels are associated with adverse early-life respiratory trajectories, supporting stricter prevention of prenatal lead exposure.
Clinical Implications: Reinforces public health and prenatal counseling to minimise lead exposure during pregnancy; may inform screening and early monitoring of respiratory symptoms in children born to mothers with higher prenatal Pb levels.
Key Findings
- In 87,041 mother–child pairs, four wheeze/asthma trajectory groups were identified: never-or-infrequent, transient-early, early-onset, persistent.
- Median maternal blood lead was 5.8 ng/g (~0.6 μg/dL); higher maternal BLL (3rd–5th quintiles) associated with increased risks of transient-early and persistent wheezing and persistent asthma.
- Associations were observed within low exposure ranges typical of contemporary populations, highlighting risk at low-level prenatal Pb exposure.
Methodological Strengths
- Very large, nationwide prospective birth cohort with standardized annual respiratory assessments using ISAAC questionnaire.
- Advanced trajectory modelling (group-based) and Bayesian regression controlling for confounders.
Limitations
- Maternal blood lead measured once (2nd/3rd trimester); potential exposure misclassification across pregnancy.
- Residual confounding from unmeasured factors (e.g., postnatal lead exposure, other environmental toxicants, genetic susceptibility) cannot be excluded.
Future Directions: Follow children beyond age 4 to examine persistence into later childhood; examine mediation by birth outcomes and postnatal exposures; explore interventions to reduce prenatal lead and evaluate respiratory outcomes.
BACKGROUND: Asthma is a major chronic disease in childhood. Environmental factors such as air pollution, tobacco smoke, and dust have been associated with asthma prevalence. Lead (Pb) exposure can cause adverse health outcomes, yet epidemiologic evidence linking prenatal maternal Pb exposure during pregnancy and childhood wheeze/asthma is mixed, and longitudinal studies characterising early-life respiratory phenotypes at contemporary low exposure levels remain limited. OBJECTIVES: To examine the association between maternal Pb exposure during pregnancy and trajectories of wheezing and asthma in children up to 4 years of age in the Japan Environment and Children's Study (JECS). METHODS: We analysed data of 87,041 mother-child dyads from JECS, a large nationwide birth cohort study with a broad geographic coverage throughout Japan. Maternal blood Pb concentrations were measured in samples collected during the second or third trimester. Childhood wheezing and asthma were assessed annually from ages 1 to 4 years using the International Study of Asthma and Allergies in Childhood questionnaire. Latent trajectories were identified using group-based trajectory modelling, and associations with maternal blood Pb concentrations (BLL; quintiles) were examined using Bayesian binomial logistic regression models. RESULTS: Median (interquartile range) maternal BLL was 5.8 (4.7-7.3) ng/g (≈ 0.6 [0.5-0.8] µg/dl). Four trajectory groups were identified for both wheezing and asthma: never-or-infrequent, transient-early, early-onset, and persistent. Higher maternal BLL (third-fifth quintiles) was associated with increased risks of transient-early and persistent wheezing and of persistent asthma, compared with the never-or-infrequent group. These associations were observed within the low exposure range typical of contemporary populations. CONCLUSIONS: Prenatal Pb exposure, even at low levels, may increase the risk of persistent wheezing and asthma in early childhood, underscoring the importance of minimising Pb exposure during pregnancy.