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Environmental Sensitivity Illnesses: Advances in Mechanisms and Molecular Signatures

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Pathology, Diagnostics, and Therapeutics".

Deadline for manuscript submissions: 20 March 2026 | Viewed by 603

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Department of Biomedical and Dental Sciences and Morpho-Functional Imaging, University of Messina, 98125 Messina, Italy
Interests: inflammation; oxidative stress; biochemical markers; molecular markers
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Special Issue Information

Dear Colleagues,

Environmental sensitivity illnesses (ESIs), such as electrohypersensitivity, multiple chemical sensitivity, fibromyalgia, and chronic fatigue syndrome, are considered an emerging health burden worldwide due to the continuous increase of daily exposure to electromagnetic fields, chemicals, drugs, and other toxic xenobiotics.

Xenobiotic exposure can trigger oxidative stress and concomitant inflammation, which are common features in ESI patients, together with alterations in the gut metabolism.

However, to date, the molecular mechanisms leading to the development of ESIs have not been thoroughly investigated.

This Special Issue will provide insights into recent advances in the above research areas at a molecular level. We welcome original research papers, as well as systematic reviews and meta-analyses, that provide valuable insights into the identification of possible biomarkers and targets that can clarify the mechanisms and molecular signatures in ESIs.

Prof. Dr. Daniela Caccamo
Guest Editor

Manuscript Submission Information

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Keywords

  • electromagnetic hypersensitivity
  • multiple chemical sensitivity
  • fibromyalgia
  • chronic fatigue syndrome
  • chronic pain disorder
  • toxicant-induced loss of tolerance
  • total allergy syndrome
  • circulating biomarkers
  • genetic susceptibility factors
  • immune system alterations

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Published Papers (1 paper)

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Review

22 pages, 827 KB  
Review
The Gut–Brain–Immune Axis in Environmental Sensitivity Illnesses: Microbiome-Centered Narrative Review of Fibromyalgia Syndrome, Myalgic Encephalomyelitis/Chronic Fatigue Syndrome, and Multiple Chemical Sensitivity
by Kentaro Watai, Masami Taniguchi and Kenichi Azuma
Int. J. Mol. Sci. 2025, 26(20), 9997; https://doi.org/10.3390/ijms26209997 - 14 Oct 2025
Viewed by 302
Abstract
Environmental sensitivity illnesses—including fibromyalgia syndrome (FMS), myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), and multiple chemical sensitivity (MCS)—are chronic, disabling disorders characterized by hypersensitivity to environmental stimuli, persistent fatigue, widespread pain, and neurocognitive and autonomic dysfunction. Although their diagnostic criteria differ, increasing evidence suggests overlapping [...] Read more.
Environmental sensitivity illnesses—including fibromyalgia syndrome (FMS), myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), and multiple chemical sensitivity (MCS)—are chronic, disabling disorders characterized by hypersensitivity to environmental stimuli, persistent fatigue, widespread pain, and neurocognitive and autonomic dysfunction. Although their diagnostic criteria differ, increasing evidence suggests overlapping clinical features and shared biological mechanisms. A unifying hypothesis highlights the gut–brain–immune axis, where alterations in the intestinal microbiome, epithelial barrier dysfunction, and aberrant immune signaling interact with central sensitization and systemic metabolic dysregulation. Recent studies demonstrate reduced microbial diversity, depletion of anti-inflammatory taxa (e.g., Faecalibacterium prausnitzii, Bifidobacterium), and enrichment of pro-inflammatory Clostridium species across these conditions. These shifts likely alter production of short-chain fatty acids, amino acid metabolites, and complex lipids, with downstream effects on mitochondrial function, neuroinflammation, and host energy metabolism. Moreover, emerging clinical interventions—including probiotics, prebiotics, synbiotics, and fecal microbiota transplantation—suggest a potential role for microbiome-targeted therapies, though controlled evidence remains limited. This review synthesizes current knowledge on microbiome alterations in FMS, ME/CFS, and MCS, emphasizing their convergence on metabolic and immune pathways. By integrating microbial, immunological, and neurophysiological perspectives, we propose a microbiome-centered framework for understanding environmental sensitivity illnesses and highlight avenues for translational research and therapeutic innovation. Full article
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