Daily Respiratory Research Analysis
Analyzed 202 papers and selected 3 impactful papers.
Summary
Mechanistic virology, critical care epidemiology, and diagnostic microbiology advanced today’s respiratory science. A Science Advances study used eVLP-coupled HDX-MS to reveal allosteric effects of furin cleavage and D614G on SARS‑CoV‑2 spike, a Lancet Respiratory Medicine cohort mapped predictors of outcomes in >9,800 immunocompromised adults with acute hypoxaemic respiratory failure, and a Mycoses study showed high‑volume 37°C sputum culture markedly improves Aspergillus (including azole‑resistant) detection.
Research Themes
- Mechanistic insights into viral entry and spike conformational dynamics
- Global outcomes and risk predictors in immunocompromised acute respiratory failure
- Diagnostic workflow innovation for aspergillosis and resistance surveillance
Selected Articles
1. Conformational dynamics of SARS-CoV-2 spike on a membrane reveals the allosteric effects of furin cleavage and the D614G mutation.
Using eVLP-coupled HDX-MS, the authors mapped how the membrane context and sequence changes tune SARS‑CoV‑2 spike conformational ensembles. D614G favored the closed-interface prefusion spike, potentially limiting premature S1 shedding, whereas furin cleavage allosterically increased S2′ flexibility, likely facilitating TMPRSS2 processing and infectivity. The platform enables spike analyses in near-native membranes.
Impact: This study provides first-principles allosteric insights into how D614G and furin processing modulate spike dynamics and protease accessibility, using a broadly applicable eVLP–HDX-MS platform.
Clinical Implications: While preclinical, these data refine mechanistic understanding of transmissibility and protease-targeted interventions and can inform design/selection of spike antigens and entry inhibitors.
Key Findings
- eVLP-displayed full-length spike samples the open-interface trimer conformation seen in soluble constructs.
- D614G mutation favors the canonical closed-interface prefusion conformation, potentially reducing premature S1 shedding when the furin site is cleaved.
- Furin cleavage at S1/S2 allosterically increases S2′ flexibility, likely enhancing TMPRSS2 processing and infectivity.
- eVLP–HDX-MS offers a powerful platform to study viral membrane proteins in near-native contexts.
Methodological Strengths
- Integration of HDX-MS with eVLPs to interrogate full-length membrane-embedded spike.
- Direct comparative analysis of sequence variants and processing states in a near-native context.
Limitations
- Preclinical biophysical study without direct in vivo validation of infectivity changes.
- Findings may vary across cell types and additional spike mutations not studied here.
Future Directions: Extend eVLP–HDX-MS to diverse variants and host proteases, integrate with live-cell fusion/infectivity assays, and apply to antigen design for next‑gen vaccines.
By combining hydrogen-deuterium exchange monitored by mass spectrometry (HDX-MS) with the ability of enveloped virus-like particles (eVLPs) to display full-length native-like severe acute respiratory syndrome coronavirus 2 spike protein, we have determined the energetic and conformational effects of both the membrane environment and unique sequence features that are considered incompatible with soluble protein constructs. We find that eVLP-displayed spike can sample the open-interface trimer conformation observed in solub
2. Epidemiology, ventilation, and outcomes of acute respiratory failure in immunocompromised patients from 103 intensive care units in 26 countries: a retrospective observational study.
In 9,854 immunocompromised adults with ARF across 103 ICUs in 26 countries, infection predominated (62%), over half had multiple contributing causes, and median oxygenation was severely impaired. The study identified key risk and protective factors for 30‑day mortality and intubation, providing contemporary, globally generalizable evidence to guide management and goals‑of‑care discussions.
Impact: Largest contemporary international analysis of immunocompromised ARF delineating causes, oxygenation, and predictors of mortality/intubation to inform triage and ventilatory strategies.
Clinical Implications: Supports personalized risk stratification, timing of intubation, and selection of oxygenation strategies in immunocompromised ARF, and grounds goals‑of‑care discussions with robust multicountry evidence.
Key Findings
- Among 9,854 patients, infection was the leading ARF cause (62.0%); 53.7% had multiple contributing causes; no cause identified in 15.1%.
- Median PaO2/FiO2 at ICU admission reflected severe hypoxaemia; ventilation/oxygenation strategies varied across centers.
- Cox modeling identified risk and protective factors for 30‑day mortality and for the need for intubation in immunocompromised ARF.
Methodological Strengths
- Very large, multinational, multicenter cohort with standardized data extraction.
- Time-to-event modeling (Cox) for mortality and intubation with comprehensive covariates.
Limitations
- Retrospective design with potential residual confounding and practice heterogeneity.
- Some variables and cause attributions may be incomplete or center-dependent.
Future Directions: Prospective validation of risk models, evaluation of oxygenation/intubation strategies in pragmatic trials, and subgroup analyses by immunosuppression etiology.
BACKGROUND: Acute hypoxaemic respiratory failure (ARF) is the leading cause of intensive care unit (ICU) admission among immunocompromised patients. However, contemporary data regarding the epidemiology, management, and outcomes of ARF in this population remain scarce. We aimed to identify predictors of mortality and intubation in immunocompromised patients admitted to the ICU with ARF. METHODS: This retrospective observational study was conducted in 103 ICUs in 26 countries. Adults (≥18 years) with ARF and immunodefic
3. High-Volume Culture Improves Diagnostic Yield of Aspergillus Species From Sputum.
Parallel high-volume sputum culture at 37°C substantially outperformed conventional low-volume 29°C culture for moulds (41.6% vs 27.7%) and Aspergillus (37.0% vs 11.5%). Critically, 91.3% of azole‑resistant A. fumigatus isolates were recovered by HVC37 versus 43.5% by conventional culture, supporting adoption of HVC37 in routine workflows.
Impact: Actionable diagnostic innovation with large sample size that improves detection of clinically pivotal and drug‑resistant Aspergillus from sputum.
Clinical Implications: Incorporating HVC37 into routine sputum mycology can increase case detection, particularly of azole‑resistant A. fumigatus, informing timely antifungal therapy and resistance surveillance.
Key Findings
- Across 1,546 sputum samples, HVC37 detected moulds in 41.6% vs 27.7% with CC29; Aspergillus detection 37.0% vs 11.5% (absolute +25.5%).
- In chronic pulmonary aspergillosis samples, HVC37 outperformed CC29 (moulds 53.0% vs 30.6%; Aspergillus 45.2% vs 15.5%).
- Of 46 azole‑resistant A. fumigatus isolates, HVC37 recovered 42 (91.3%) vs 20 (43.5%) with conventional culture.
Methodological Strengths
- Parallel, side‑by‑side culture comparison with large sample size and defined inoculum volumes.
- EUCAST-standard antifungal susceptibility testing with resistance outcomes.
Limitations
- Single laboratory network; generalizability to other settings and specimen types requires validation.
- Clinical impact on patient outcomes was not directly measured.
Future Directions: Multicenter implementation studies linking HVC37 yield to clinical outcomes and cost‑effectiveness; evaluation in non‑sputum respiratory specimens.
OBJECTIVES: Sputum is a commonly collected specimen for suspected respiratory fungal infections due to its non-invasive nature and diagnostic value. However, conventional culture at 29°C (CC29) often fails to detect filamentous moulds. To improve recovery, we applied a high-volume culture incubated at 37°C (HVC37) and compared its diagnostic performance with CC29, with particular focus on Aspergillus species and azole-resistant isolates. METHODS: Between October 2022 and June 2025, a total of 1546 sputum samples from 793 pati