Severe asthma is marked by persistent eosinophilic inflammation, but the role of all-trans retinoic acid (ATRA) in eosinophil homeostasis remains unclear.
Objective
This study examined the regulatory role of ATRA in eosinophil function in severe asthma.
Methods
Multiomics analysis (transcriptomics, proteomics, and lipidomics) was conducted on blood eosinophils from healthy participants and patients with severe asthma. The effects of ATRA on eosinophil function were further analyzed by using flow cytometry and quantitative RT-PCR.
Results
Transcriptomic profiling of eosinophils from patients with severe asthma revealed a distinct gene expression signature, with upregulation of the genes GGT5, IL2RA, CCL23, and NOD2 and downregulation of SPRY2 and HIC1. This phenotype was driven by type 2 cytokines (IL-5 and IL-4) and muramyl dipeptide but was counterregulated by ATRA. Proteomic analysis showed increased expression of P-selectin glycoprotein ligand-1 in SA-EOS, which was upregulated by type 2 cytokines and downregulated by ATRA. Lipidomic analysis identified dysregulated 15-lipoxygenase metabolism in SA-EOS, with ATRA selectively inhibiting cysteinyl leukotriene metabolism while sparing the 15-lipoxygenase pathway. Multiomics analysis of eosinophils from ATRA-treated healthy participants revealed specific downregulation of IL1RL1 and IL3RA, reducing responsiveness to IL-33 and IL-3 and distinguishing them from IL-5–induced eosinophils.
Conclusion
These findings highlight the role of ATRA in maintaining eosinophil homeostasis and counterregulating IL-5–driven activation, thus offering insights into potential therapeutic strategies for severe asthma.
{"title":"Multiomics insights into retinoic acid–mediated regulation of eosinophils in severe asthma","authors":"Jun Miyata MD, PhD , Keeya Sunata MD, PhD , Hisashi Sasaki MD , Yusuke Kawashima PhD , Yo Otsu MD , Ryuta Onozato MD , Emiko Matsuyama MD , Shinichi Okuzumi MD, PhD , Takao Mochimaru MD, PhD , Katsunori Masaki MD, PhD , Hiroki Kabata MD, PhD , Ryo Konno PhD , Masaki Ishikawa PhD , Yoshinori Hasegawa PhD , Yoshifumi Kimizuka MD, PhD , Makoto Arita PhD , Koichi Fukunaga MD, PhD","doi":"10.1016/j.jaci.2025.10.029","DOIUrl":"10.1016/j.jaci.2025.10.029","url":null,"abstract":"<div><h3>Background</h3><div>Severe asthma is marked by persistent eosinophilic inflammation, but the role of all-trans retinoic acid (ATRA) in eosinophil homeostasis remains unclear.</div></div><div><h3>Objective</h3><div>This study examined the regulatory role of ATRA in eosinophil function in severe asthma.</div></div><div><h3>Methods</h3><div>Multiomics analysis (transcriptomics, proteomics, and lipidomics) was conducted on blood eosinophils from healthy participants and patients with severe asthma. The effects of ATRA on eosinophil function were further analyzed by using flow cytometry and quantitative RT-PCR.</div></div><div><h3>Results</h3><div>Transcriptomic profiling of eosinophils from patients with severe asthma revealed a distinct gene expression signature, with upregulation of the genes <em>GGT5</em>, <em>IL2RA</em>, <em>CCL23</em>, and <em>NOD2</em> and downregulation of <em>SPRY2</em> and <em>HIC1</em>. This phenotype was driven by type 2 cytokines (IL-5 and IL-4) and muramyl dipeptide but was counterregulated by ATRA. Proteomic analysis showed increased expression of P-selectin glycoprotein ligand-1 in SA-EOS, which was upregulated by type 2 cytokines and downregulated by ATRA. Lipidomic analysis identified dysregulated 15-lipoxygenase metabolism in SA-EOS, with ATRA selectively inhibiting cysteinyl leukotriene metabolism while sparing the 15-lipoxygenase pathway. Multiomics analysis of eosinophils from ATRA-treated healthy participants revealed specific downregulation of IL1RL1 and IL3RA, reducing responsiveness to IL-33 and IL-3 and distinguishing them from IL-5–induced eosinophils.</div></div><div><h3>Conclusion</h3><div>These findings highlight the role of ATRA in maintaining eosinophil homeostasis and counterregulating IL-5–driven activation, thus offering insights into potential therapeutic strategies for severe asthma.</div></div>","PeriodicalId":14936,"journal":{"name":"Journal of Allergy and Clinical Immunology","volume":"157 2","pages":"Pages 531-539"},"PeriodicalIF":11.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145461949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-01DOI: 10.1016/j.jaci.2025.12.025
Wendy Elverson RD LDN , Tina Ho MD , Karol Timmons RN MS CPNP , Maya Dayanim , Lynda Schneider MD FAAAAI , Jennifer Lebovidge PhD
{"title":"Evaluating Diet and Nutrition-Related Concerns in a Multidisciplinary Clinic for Pediatric Patients with Atopic Dermatitis","authors":"Wendy Elverson RD LDN , Tina Ho MD , Karol Timmons RN MS CPNP , Maya Dayanim , Lynda Schneider MD FAAAAI , Jennifer Lebovidge PhD","doi":"10.1016/j.jaci.2025.12.025","DOIUrl":"10.1016/j.jaci.2025.12.025","url":null,"abstract":"","PeriodicalId":14936,"journal":{"name":"Journal of Allergy and Clinical Immunology","volume":"157 2","pages":"Page AB7"},"PeriodicalIF":11.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-01DOI: 10.1016/S0091-6749(25)02241-9
{"title":"Meeting Announcement","authors":"","doi":"10.1016/S0091-6749(25)02241-9","DOIUrl":"10.1016/S0091-6749(25)02241-9","url":null,"abstract":"","PeriodicalId":14936,"journal":{"name":"Journal of Allergy and Clinical Immunology","volume":"157 2","pages":"Page 3A"},"PeriodicalIF":11.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146147100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-01DOI: 10.1016/j.jaci.2025.12.016
Jonathan Bernstein MD FAAAAI , Emel Aygören-Pürsün MD , Danny Cohn MD PhD , Henriette Farkas MD PhD DSc , William Lumry MD FAAAAI , Andrea Zanichelli MD , James Hao PhD , Michael Smith PharmD , Paul Audhya MD , Erik Hansen , Nathan Teuscher , Marc Riedl MD MS
Pub Date : 2026-02-01DOI: 10.1016/j.jaci.2025.12.041
Giselle Mosnaim , Sarbjit Saini MD FAAAAI , Michael Holden MD, MS , Ben Trzaskoma , Jonathan Bernstein MD FAAAAI
{"title":"Concurrent Improvement Over Time in Multiple Aspects of Quality of Life in Patients with Chronic Spontaneous Urticaria Treated with Omalizumab","authors":"Giselle Mosnaim , Sarbjit Saini MD FAAAAI , Michael Holden MD, MS , Ben Trzaskoma , Jonathan Bernstein MD FAAAAI","doi":"10.1016/j.jaci.2025.12.041","DOIUrl":"10.1016/j.jaci.2025.12.041","url":null,"abstract":"","PeriodicalId":14936,"journal":{"name":"Journal of Allergy and Clinical Immunology","volume":"157 2","pages":"Page AB12"},"PeriodicalIF":11.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146147558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-01DOI: 10.1016/j.jaci.2025.09.014
Kim Ramme MD, PhD , AnnaCarin Horne MD, PhD , Karin Beutel MD , Jacques-Emmanuel Galimard PhD , Ali Abdallah Alahmari MD , Giorgio Ottaviano MD , Despina Moshous MD, PhD , Savas Kansoy MD , Zohreh Nademi MD, PhD , Maura Faraci MD , Mikael Sundin MD, PhD , Franca Fagioli MD , Michael H. Albert MD , Petr Sedlacek MD , Yves Bertrand MD, PhD , Franco Locatelli MD, PhD , Catherine Paillard MD , Karin Mellgren MD, PhD , Ingo Müller MD , Johann Greil MD , Selim Corbacioglu MD, PhD
Background
Hematopoietic stem cell transplantation (HCT) is the only curative treatment in primary hemophagocytic lymphohistiocytosis (pHLH). However, HCT is associated with a wide range of late effects (LEs).
Objective
We sought to characterize the long-term outcome and LEs following HCT in pHLH.
Methods
A total of 274 children with pHLH from the European Society for Blood and Marrow Transplantation registry who underwent allogeneic HCT between 2004 and 2015 were included. Multivariable logistic regression models were used to evaluate the adjusted impact of baseline variables on central nervous system and hormonal LEs, respectively.
Results
A broad spectrum of LEs was identified, with neurologic (31%) and hormonal (34.8%) complications being the most prevalent. Chemotherapy (HLH-1994/HLH-2004) before HCT was identified as a significant risk factor for endocrinological LEs (P = .03), highlighting a novel aspect not previously reported. The presence of neurologic abnormality at diagnosis was an independent risk factor for neurologic LEs (P < .001) as was incomplete remission status at the time of HCT (P = .04).
Conclusions
HCT has significantly improved survival in patients with pHLH. However, survivors still face significant risks of LEs.
{"title":"Late effects after hematopoietic stem cell transplantation in patients with HLH: A Histiocyte Society, PDWP, IEWP, and TCWP EBMT Study","authors":"Kim Ramme MD, PhD , AnnaCarin Horne MD, PhD , Karin Beutel MD , Jacques-Emmanuel Galimard PhD , Ali Abdallah Alahmari MD , Giorgio Ottaviano MD , Despina Moshous MD, PhD , Savas Kansoy MD , Zohreh Nademi MD, PhD , Maura Faraci MD , Mikael Sundin MD, PhD , Franca Fagioli MD , Michael H. Albert MD , Petr Sedlacek MD , Yves Bertrand MD, PhD , Franco Locatelli MD, PhD , Catherine Paillard MD , Karin Mellgren MD, PhD , Ingo Müller MD , Johann Greil MD , Selim Corbacioglu MD, PhD","doi":"10.1016/j.jaci.2025.09.014","DOIUrl":"10.1016/j.jaci.2025.09.014","url":null,"abstract":"<div><h3>Background</h3><div>Hematopoietic stem cell transplantation (HCT) is the only curative treatment in primary hemophagocytic lymphohistiocytosis (pHLH). However, HCT is associated with a wide range of late effects (LEs).</div></div><div><h3>Objective</h3><div>We sought to characterize the long-term outcome and LEs following HCT in pHLH.</div></div><div><h3>Methods</h3><div>A total of 274 children with pHLH from the European Society for Blood and Marrow Transplantation registry who underwent allogeneic HCT between 2004 and 2015 were included. Multivariable logistic regression models were used to evaluate the adjusted impact of baseline variables on central nervous system and hormonal LEs, respectively.</div></div><div><h3>Results</h3><div>A broad spectrum of LEs was identified, with neurologic (31%) and hormonal (34.8%) complications being the most prevalent. Chemotherapy (HLH-1994/HLH-2004) before HCT was identified as a significant risk factor for endocrinological LEs (<em>P</em> = .03), highlighting a novel aspect not previously reported. The presence of neurologic abnormality at diagnosis was an independent risk factor for neurologic LEs (<em>P</em> < .001) as was incomplete remission status at the time of HCT (<em>P</em> = .04).</div></div><div><h3>Conclusions</h3><div>HCT has significantly improved survival in patients with pHLH. However, survivors still face significant risks of LEs.</div></div>","PeriodicalId":14936,"journal":{"name":"Journal of Allergy and Clinical Immunology","volume":"157 2","pages":"Pages 486-494"},"PeriodicalIF":11.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145182732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-01DOI: 10.1016/j.jaci.2025.07.030
Henning Olbrich MD , Sophie L. Preuß MD , Khalaf Kridin MD, PhD , Gema Hernandez PhD , Diamant Thaçi MD , Ralf J. Ludwig MD , Philip Curman MD, PhD
Background
Coronavirus disease 2019 (COVID-19) infection and vaccination have unclear impacts on type 2 inflammatory diseases. Although viral infections can drive immune dysregulation, the extent to which COVID-19 infection and vaccination affect type 2 inflammatory diseases in various organ systems remains underexplored.
Objective
We sought to assess the risk of new-onset type 2 inflammatory diseases after COVID-19 infection and vaccination.
Methods
We conducted a large-scale retrospective matched cohort study using a US electronic health records database of more than 118 million patients. Three cohorts were defined: individuals with COVID-19 infection (n = 973,794), individuals with COVID-19 vaccination (n = 691,270), and unexposed controls (n = 4,388,409). Propensity score matching balanced demographic and clinical covariates. We calculated hazard ratios (HRs) for incident asthma, allergic rhinitis, chronic rhinosinusitis, atopic dermatitis, and eosinophilic esophagitis over 3-month follow-up.
Results
COVID-19 infection significantly increased the risks of asthma (HR 1.656, 95% CI 1.590-1.725), allergic rhinitis (HR 1.272, 95% CI 1.214-1.333), and chronic rhinosinusitis (HR 1.744, 95% CI 1.671-1.821). Risks for atopic dermatitis or eosinophilic esophagitis remained unchanged. In contrast, vaccination lowered the risks of asthma (HR 0.678, 95% CI 0.636-0.722) and chronic rhinosinusitis (HR 0.799, 95% CI 0.752-0.850). Direct comparison showed a 2- to 3-fold greater risk of respiratory type 2 inflammatory diseases with infection than with vaccination.
Conclusions
COVID-19 infection is associated with a heightened risk of respiratory type 2 inflammatory diseases, whereas vaccination appears protective.
{"title":"COVID-19 infection raises respiratory type 2 inflammatory disease risk, whereas vaccination is protective","authors":"Henning Olbrich MD , Sophie L. Preuß MD , Khalaf Kridin MD, PhD , Gema Hernandez PhD , Diamant Thaçi MD , Ralf J. Ludwig MD , Philip Curman MD, PhD","doi":"10.1016/j.jaci.2025.07.030","DOIUrl":"10.1016/j.jaci.2025.07.030","url":null,"abstract":"<div><h3>Background</h3><div>Coronavirus disease 2019 (COVID-19) infection and vaccination have unclear impacts on type 2 inflammatory diseases. Although viral infections can drive immune dysregulation, the extent to which COVID-19 infection and vaccination affect type 2 inflammatory diseases in various organ systems remains underexplored.</div></div><div><h3>Objective</h3><div>We sought to assess the risk of new-onset type 2 inflammatory diseases after COVID-19 infection and vaccination.</div></div><div><h3>Methods</h3><div>We conducted a large-scale retrospective matched cohort study using a US electronic health records database of more than 118 million patients. Three cohorts were defined: individuals with COVID-19 infection (n = 973,794), individuals with COVID-19 vaccination (n = 691,270), and unexposed controls (n = 4,388,409). Propensity score matching balanced demographic and clinical covariates. We calculated hazard ratios (HRs) for incident asthma, allergic rhinitis, chronic rhinosinusitis, atopic dermatitis, and eosinophilic esophagitis over 3-month follow-up.</div></div><div><h3>Results</h3><div>COVID-19 infection significantly increased the risks of asthma (HR 1.656, 95% CI 1.590-1.725), allergic rhinitis (HR 1.272, 95% CI 1.214-1.333), and chronic rhinosinusitis (HR 1.744, 95% CI 1.671-1.821). Risks for atopic dermatitis or eosinophilic esophagitis remained unchanged. In contrast, vaccination lowered the risks of asthma (HR 0.678, 95% CI 0.636-0.722) and chronic rhinosinusitis (HR 0.799, 95% CI 0.752-0.850). Direct comparison showed a 2- to 3-fold greater risk of respiratory type 2 inflammatory diseases with infection than with vaccination.</div></div><div><h3>Conclusions</h3><div>COVID-19 infection is associated with a heightened risk of respiratory type 2 inflammatory diseases, whereas vaccination appears protective.</div></div>","PeriodicalId":14936,"journal":{"name":"Journal of Allergy and Clinical Immunology","volume":"157 2","pages":"Pages 517-524"},"PeriodicalIF":11.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144851205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}