Daily Cosmetic Research Analysis
Three studies stand out today: a multi-cohort, single-cell-integrated analysis explains why LUAD patients with COPD respond better to immunotherapy; a double-blind cross-over human trial shows age-dependent vascular benefits of dietary nitrate mediated by the oral microbiome; and a first-of-its-kind experiment reveals how a common sunscreen UV filter reshapes nascent marine plastisphere communities and biofilm functions.
Summary
Three studies stand out today: a multi-cohort, single-cell-integrated analysis explains why LUAD patients with COPD respond better to immunotherapy; a double-blind cross-over human trial shows age-dependent vascular benefits of dietary nitrate mediated by the oral microbiome; and a first-of-its-kind experiment reveals how a common sunscreen UV filter reshapes nascent marine plastisphere communities and biofilm functions.
Research Themes
- Immuno-oncology and comorbidity-driven microenvironmental shifts
- Oral microbiome–nitrate–nitric oxide axis and vascular aging
- Cosmetic UV filters as environmental co-pollutants shaping microbial ecologies
Selected Articles
1. Enhanced immunotherapy response in lung adenocarcinoma patients with COPD: insights into tumor cells and immune microenvironment characteristics.
Across a 248-patient immunotherapy cohort with single-cell and mfIHC validation, COPD-associated LUAD showed higher HLA-I on malignant cells and a more cytotoxic, immunoregulatory microenvironment. These features correlated with superior immunotherapy responses and were replicated in an independent 65-patient cohort.
Impact: It links a common comorbidity (COPD) to mechanistic tumor-immune features explaining enhanced immunotherapy efficacy, enabling risk stratification and biomarker development.
Clinical Implications: COPD status and associated HLA-I/immune infiltration profiles could inform immunotherapy selection and monitoring in LUAD; prospective validation could refine patient stratification and combination strategies.
Key Findings
- COPD-associated LUAD tumors showed elevated HLA-I expression on malignant cells.
- Tumor microenvironment was more active with increased NK cells and effector T-cell infiltration and immunoregulatory shifts.
- Improved immunotherapy responses in COPD patients were observed in a 248-patient cohort and replicated in an independent 65-patient cohort.
- Single-cell RNA-seq (187,123 cells) and mfIHC (34 patients) validated tumor and immune features.
Methodological Strengths
- Integration of clinical cohorts with single-cell transcriptomics and mfIHC.
- Independent validation cohort analysis to confirm findings.
Limitations
- Observational design without randomization; potential residual confounding.
- Limited sample size for single-cell and mfIHC substudies; follow-up duration not detailed.
Future Directions: Prospective trials to validate COPD-informed biomarkers, mechanistic studies to modulate HLA-I and cytotoxic infiltration, and development of clinical tools for stratifying LUAD with COPD.
BACKGROUND: Lung cancer and chronic obstructive pulmonary disease (COPD) are major global health challenges, and their coexistence in patients presents unique clinical complexities. Interestingly, patients with both lung adenocarcinoma (LUAD) and COPD show reduced responses to conventional chemotherapy and targeted therapies but demonstrate enhanced sensitivity to immunotherapy. METHODS: We investigated this phenomenon using a cohort of 248 LUAD patients undergoing immunotherapy. Single-cell transcriptomic analysis was performed on 187,123 cells from tumor samples, adjacent normal tissues, and peripheral blood mononuclear cells from six treatment-naïve LUAD patients—three with COPD and three without. To further validate these findings, we conducted multiplex fluorescent immunohistochemical (mfIHC) analysis on 34 additional treatment-naïve LUAD patients and analyzed an independent cohort of 65 LUAD patients undergoing immunotherapy. RESULTS: We found that COPD-associated LUAD tumors exhibited distinctive features, including elevated expression of human leukocyte antigen I (HLA-I) on malignant cells and a less aggressive tumor phenotype. The immune microenvironment in these tumors was more active, with increased infiltration of NK cells, effector CD4 CONCLUSION: Our study reveals that COPD leads to elevated HLA-I expression and a more active immune microenvironment in LUAD tumors, characterized by enhanced cytotoxic immune cell infiltration and a shift towards immunoregulatory profiles. These features correlate with improved immunotherapy responses, highlighting the potential for optimizing treatment strategies in LUAD patients with COPD. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12964-025-02332-7.
2. Ageing modifies the oral microbiome, nitric oxide bioavailability and vascular responses to dietary nitrate supplementation.
In a double-blind, placebo-controlled cross-over trial (n=75), nitrate-rich beetroot juice reduced brachial MAP by 4±4 mmHg in older adults but not in young participants, with blood pressure changes correlating with plasma nitrite. Oral microbiome responses to nitrate differed by age, and FMD changes in the young differed between mouthwash and nitrate conditions.
Impact: It mechanistically links the oral microbiome–nitrate–nitric oxide pathway to age-dependent vascular responses, informing targeted dietary interventions.
Clinical Implications: Dietary nitrate supplementation may be prioritized for older adults with elevated blood pressure; antiseptic mouthwash use could modulate endothelial responses in the young and should be considered when advising on nitrate-based strategies.
Key Findings
- Oral microbiome responses to nitrate differed between young and older adults (post-BR NMDS P=0.01).
- Older adults exhibited a reduction in brachial MAP after nitrate-rich beetroot juice (−4±4 mmHg, P=0.003), absent in the young.
- In young adults, changes in ΔFMD% differed between mouthwash and nitrate conditions (P=0.04).
- Blood pressure reduction in older adults correlated with increased plasma nitrite.
Methodological Strengths
- Placebo-controlled, double-blind cross-over design with washout periods.
- Objective vascular and biochemical endpoints (MAP, FMD, plasma nitrite) with age-stratified analysis.
Limitations
- Short intervention periods (2 weeks per condition) and limited long-term outcomes.
- Blinding of mouthwash conditions is uncertain; generalizability beyond healthy volunteers may be limited.
Future Directions: Longer-term trials assessing clinical endpoints, microbiome functional/metabolomic profiling, dose–response studies, and interaction with oral antiseptics.
This study evaluated whether changes in the oral microbiome in response to dietary nitrate and antiseptic mouthwash treatments were related to changes in nitric oxide bioavailability and vascular function. Thirty-nine young (18-30 years) and thirty-six older (67-79 years) males and females completed a placebo-controlled, double-blind cross-over intervention including three 2-week conditions separated by 2-week washouts: placebo beetroot juice (PL), nitrate-rich beetroot juice (BR) and antiseptic mouthwash (MW). The oral microbiomes of young and older adults responded differently to BR (post BR non-metric multidimensional scaling P = 0.01), while the oral microbiomes of both age groups were unaffected by PL and MW interventions. Older people, who had elevated baseline mean arterial pressure (MAP; 95 ± 9 mmHg) compared to young adults (87 ± 7 mmHg, P < 0.001), showed decreased brachial MAP (-4±4 mmHg, P = 0.003) after BR while this effect was absent in the young. Flow mediated dilatation (FMD) variables were not affected by the interventions in older adults, while in the young there was a difference in changes (from pre to post) in ΔFMD% between the MW and BR conditions (P = 0.04). Decreased blood pressure in older adults correlated with increased plasma nitrite concentration (change in central MAP vs. [NO
3. The invisible threats of sunscreen as a plastic co-pollutant: Impact of a common organic UV filter on biofilm formation and metabolic function in the nascent marine plastisphere.
In nascent LDPE plastispheres exposed to EHMC (5 mg/L), metagenomics showed enrichment of Pseudomonas/Psychromonas and depletion of pollutant-degrading Marinomonas. Proteomics (3,070 proteins) revealed upregulation of biofilm maintenance proteins, notably OprF, and signatures of a shift toward anaerobic respiration.
Impact: This first demonstration that a common sunscreen UV filter reshapes early plastisphere communities and functions advances understanding of cosmetic co-pollutants and informs safer-by-design formulations and environmental policy.
Clinical Implications: While indirect for clinical practice, the findings support evaluating cosmetic UV filters for ecological safety, potentially guiding ingredient selection and regulation to mitigate downstream human health risks.
Key Findings
- EHMC exposure enriched bacterial generalists (Pseudomonas, Psychromonas) and reduced pollutant-degrading genera (e.g., Marinomonas).
- Proteomic analysis (3,070 proteins) showed upregulation of biofilm maintenance proteins, notably outer membrane porin F (OprF) linked to EPS production.
- Protein signatures indicated a shift from aerobic to anaerobic respiration, potentially selecting against obligate aerobes (Marinomonas, Pseudoalteromonas).
Methodological Strengths
- Integrated metagenomic and proteomic profiling of plastisphere communities.
- Controlled microcosm exposure enabling causal inference regarding EHMC effects.
Limitations
- Short-term study of nascent biofilms; ecological dynamics over longer timescales remain unknown.
- Single concentration (5 mg/L) and laboratory conditions may limit environmental generalizability.
Future Directions: Assess multiple UV filters and concentrations, validate in situ, link community shifts to ecosystem services and potential pathogenicity, and inform safer-by-design cosmetic formulations.
Plastic debris in marine environments serves as a substrate for microbial colonisation, forming biofilms known as 'plastispheres'. Also accumulated on plastic debris are co-pollutants including UV-protective organic UV-filters from sunscreens, which likely interact with this niche through their lipophilicity. Despite their widespread use and environmental accumulation, the influence of UV-filters on plastisphere composition and function has never been investigated. This study therefore investigates, for the first time, how co-pollution - specifically by an organic UV-filter - impacts the composition and function of marine plastisphere communities. To achieve this, low-density polyethylene (LDPE) was incubated with marine microbial communities for six days to cultivate a nascent plastisphere, which was then exposed to 5 mg/L of EthylHexyl MethoxyCinnamate (EHMC); the most used organic UV-filter in sunscreens, and a prevalent marine pollutant. Metagenomic analyses revealed that EHMC favoured the growth of bacterial generalists Pseudomonas and Psychromonas while reducing pollutant-degrading genera like Marinomonas. Analysis of 3070 proteins revealed a consistent upregulation of proteins used for biofilm maintenance by Pseudomonas with EHMC exposure, including the considerable upregulation of outer membrane porin F (OprF) which regulates exopolymeric substance (EPS) production. Additionally, proteins thought to indicate a shift from aerobic to anaerobic respiration were frequently expressed after exposure to EHMC. This may have selected against the obligate aerobes Marinomonas and Pseudoalteromonas, contributing to the observed shift in community composition. These findings underscore the importance of considering chemical co-pollutants in plastisphere research as we now begin to discover how ecologically significant, and potentially harmful microbial genera are affected by this interaction.