Acute respiratory distress syndrome (ARDS) remains one of the most severe forms of acute respiratory failure, characterized by diffuse inflammatory lung injury, non-cardiogenic pulmonary edema, and profound hypoxemia. Despite decades of investigation, ARDS continues to be associated with high morbidity and mortality, largely owing to the absence of targeted disease-modifying therapies.
A new review provides a comprehensive and mechanistically grounded synthesis of the role of the ‘cytokine storm’ as a central driver of lung injury and multiorgan dysfunction in ARDS, bridging fundamental immunopathology with clinical implications and emerging therapeutic strategies. The review was made available online in the Journal of Intensive Medicine on January 29, 2026.
“ A major strength of this review lies in its conceptual framing of ARDS not merely as a localized pulmonary disorder but as a systemic inflammatory syndrome initiated and amplified by the injured lung ,” said the authors. The disruption of the alveolar–capillary barrier facilitates the spillover of pro-inflammatory cytokines into the systemic circulation, transforming the lung from a passive target into an active source of systemic inflammation. This paradigm is critical for understanding why multiple organ dysfunction syndrome (MODS), rather than refractory hypoxemia alone, remains the leading cause of death in ARDS.
The review also provides a detailed and integrated description of the cellular and molecular mechanisms underlying the cytokine storm. By dissecting the coordinated activation of innate and adaptive immune responses—particularly the roles of alveolar macrophages, neutrophils, dendritic cells, and T lymphocyte subsets—the authors highlight how dysregulated cytokine production overwhelms physiological feedback mechanisms designed to contain inflammation. Excessive signaling through pathways such as NF-κB, JAK/STAT, and MAPK perpetuates a self-sustaining inflammatory loop, resulting in endothelial and epithelial injury, oxidative stress, and loss of barrier integrity. Importantly, this review contextualizes these processes within clinically relevant conditions, including severe viral infections such as SARS-CoV-2, underscoring their broader translational relevance.
One of the most impactful contributions of this review is its emphasis on biological heterogeneity and ARDS subphenotypes. “ The distinction between hyperinflammatory and hypoinflammatory subphenotypes represents a critical shift away from the traditional ‘one-size-fits-all’ approach to ARDS ,” noted the authors. By synthesizing evidence from latent class and cluster analyses, the authors demonstrate that patients with hyperinflammatory ARDS exhibit distinct biomarker signatures, worse clinical outcomes, and differential responses to ventilatory and pharmacological interventions. This framework provides a compelling biological explanation for the repeated failure of many immunomodulatory therapies in unselected ARDS populations and reinforces the need for biomarker-guided patient stratification.
Equally important is the systematic analysis of cytokine-mediated organ injury beyond the lung. The review delineates how circulating cytokines contribute to dysfunction across multiple systems, including the central nervous system, cardiovascular system, bone marrow, kidneys, and liver. By linking specific cytokines to defined pathophysiological mechanisms—such as blood–brain barrier disruption, myocardial depression, hematopoietic suppression, and microvascular thrombosis—this review reinforces the concept of cytokine storm as a unifying mechanism of MODS. This multiorgan perspective is essential for prognostication and therapeutic decision-making in critically ill patients.
From a therapeutic standpoint, the review critically evaluates current and emerging strategies to mitigate cytokine‑driven injury in ARDS. While reaffirming the central role of lung-protective ventilation and corticosteroids as foundational therapies, it also provides a balanced assessment of targeted biologics, extracorporeal cytokine removal, and cell-based approaches. Notably, the discussion of mesenchymal stromal cells (MSCs) and MSC-derived extracellular vesicles reflects a sophisticated understanding of immunomodulation as a paracrine, rather than purely cellular, phenomenon. By highlighting both promise and limitations, the review avoids overinterpretation of early‑phase data and emphasizes the translational challenges that must be addressed before widespread clinical adoption of these approaches.
In conclusion, this work represents a significant contribution to the field of critical care medicine by integrating immunological mechanisms, clinical phenotyping, and therapeutic innovation into a coherent framework. “ By positioning cytokine storm as a central, targetable process in ARDS—while acknowledging biological heterogeneity and timing-dependent effects—our work lays a strong conceptual foundation for precision medicine approaches ,” the authors explained. This perspective has the potential to inform future clinical trial design, refine patient selection, and ultimately transform ARDS management from predominantly supportive care to mechanism-based, individualized therapies.
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Reference
DOI: 10.1016/j.jointm.2025.12.001
About Dr. Denise Battaglini from University of Genoa, Italy
Denise Battaglini is an assistant Professor in Anesthesia and Intensive Care at the University of Genoa, Italy, and consultant in Intensive Care at IRCCS Azienda Ospedaliera Metropolitana, Genoa, Italy. Her research focuses on acute respiratory distress syndrome (ARDS), mechanical ventilation, pulmonary microbiota, ICU-acquired weakness, and early rehabilitation in critically ill patients. She is actively involved in multicenter international research networks and has contributed to observational studies, randomized trials, and translational projects aimed at optimizing respiratory support and long-term outcomes after critical illness.
Journal of Intensive Medicine
Literature review
Not applicable
Cytokine storm in acute respiratory distress syndrome
29-Jan-2026
Given her role as Editorial Board Member, Denise Battaglini had no involvement in the peer-review of this article and has no access to information regarding its peer-review. Full responsibility for the editorial process for this article was delegated to another journal editor. The other authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.