Addressing the Global Challenge of Nitrous Oxide Misuse Through a Multidisciplinary Approach: Example of the PROTOSIDE Network
Abstract
1. Context, State of the Art, and Challenges
1.1. A Historical Shift: From Medical Use to Recreational Misuse
- Origins of medical use and early recreational consumption
- The shift to mass recreational use
- The role of unregulated distribution channels
1.2. The Epidemiological Surge: A Growing Global Concern
1.2.1. Europe: A Hub for Nitrous Oxide Consumption
- Key epidemiological findings according to the EMCDDA report
- Regulatory responses and effectiveness
1.2.2. Emerging Concerns: From Acute to Chronic Health Consequences
1.3. Clinical and Biological Consequences of Nitrous Oxide Misuse [1]
1.3.1. Neurological Manifestations: Myeloneuropathy and Central Nervous System Impairment
- Clinical presentations
1.3.2. Biochemical and Metabolic Disruptions: Methylmalonic Acid and Homocysteine Dysregulation
- -
- Methionine synthase, which requires methylcobalamin as a cofactor, catalyzes the remethylation of homocysteine into methionine. When MS activity is blocked, homocysteine accumulates in plasma—a biochemical hallmark of impaired one-carbon metabolism. This elevation is clinically relevant due to its association with vascular and neurological complications.
- -
- Methylmalonyl-CoA mutase, on the other hand, depends on adenosylcobalamin (another active form of vitamin B12) and facilitates the conversion of methylmalonyl-CoA to succinyl-CoA in mitochondria. Inactivation of this enzyme leads to accumulation of methylmalonic acid (MMA), a marker of intracellular B12 dysfunction.
- As a consequence, nitrous oxide intoxication can lead to (Table 1):
- Reduction in methionine synthesis, affecting myelin integrity [30].
Biological Markers | Pathophysiological Significance |
---|---|
Plasma homocysteine | Sensitive marker of N2O exposure; reflects impaired methionine metabolism [10]. |
Methylmalonic acid (MMA) | More specific to B12-related neurological dysfunction; correlated with clinical severity [10]. |
Methionine levels | Low methionine is associated with myelin damage, linked to neurological outcomes [30]. |
- Key Takeaways:
- Vitamin B12 levels alone are unreliable, as they may appear normal despite severe toxicity [10].
1.3.3. Hematological and Bone Marrow Effects
1.3.4. Cardiovascular and Thromboembolic Complications
1.3.5. Psychiatric and Cognitive Consequences
1.4. Road Safety and Neurocognitive Risks of Nitrous Oxide Use
- Current challenges in detection:
- Public health implications:
2. Why a Global Network Was Needed
3. Multidisciplinary Competence Centers: The Foundation of PROTOSIDE
- Emergency physicians, to identify users, manage acute complications, and refer them to the right specialists;
- Neurologists, to diagnose and treat neurological injuries, including myelopathies [51];
- Specialists in laboratory medicine, equipped to perform advanced biochemical analyses such as total plasma homocysteine and MMA concentration measurements (4,6);
- Addiction specialists, to provide long-term support for individuals struggling with dependency [52];
- Addictovigilance coordinators, to monitor and report emerging trends, ensuring early warnings.
4. Comprehensive Patient Care and Prevention
- Early detection and diagnosis, leveraging multidisciplinary expertise and advanced analytical tools.
- Management, addressing acute complications, metabolic impairments, and neurological damage.
- Addiction support, including tailored programs to help patients overcome dependency on nitrous oxide.
- Long-term follow-up and coordination with primary care to ensure continuity of care through collaboration with general practitioners and specialists.
5. Knowledge Sharing and Global Collaboration
- Scientific conferences, bringing together experts to share research, discuss best practices, and align strategies to manage N2O misuse.
- Training programs for healthcare professionals, providing comprehensive modules on diagnosing, treating, and preventing N2O-related complications.
- Publications and research, contributing to the medical literature on mechanisms, health impacts, and management of N2O misuse.
6. A Global Model for Public Health Action
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
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Grzych, G.; Diesnis, R.; Dupré, T.; Niguet, J.P.; Gernez, E.; Denimal, D.; Deheul, S.; Guichard, J.C.; Scliffet, D.; Mégarbane, B.; et al. Addressing the Global Challenge of Nitrous Oxide Misuse Through a Multidisciplinary Approach: Example of the PROTOSIDE Network. Toxics 2025, 13, 466. https://doi.org/10.3390/toxics13060466
Grzych G, Diesnis R, Dupré T, Niguet JP, Gernez E, Denimal D, Deheul S, Guichard JC, Scliffet D, Mégarbane B, et al. Addressing the Global Challenge of Nitrous Oxide Misuse Through a Multidisciplinary Approach: Example of the PROTOSIDE Network. Toxics. 2025; 13(6):466. https://doi.org/10.3390/toxics13060466
Chicago/Turabian StyleGrzych, Guillaume, Remy Diesnis, Thierry Dupré, Jean Paul Niguet, Emeline Gernez, Damien Denimal, Sylvie Deheul, Jean Claude Guichard, Damien Scliffet, Bruno Mégarbane, and et al. 2025. "Addressing the Global Challenge of Nitrous Oxide Misuse Through a Multidisciplinary Approach: Example of the PROTOSIDE Network" Toxics 13, no. 6: 466. https://doi.org/10.3390/toxics13060466
APA StyleGrzych, G., Diesnis, R., Dupré, T., Niguet, J. P., Gernez, E., Denimal, D., Deheul, S., Guichard, J. C., Scliffet, D., Mégarbane, B., Redonnet-Vernhet, I., Boucher, A., Bennis, A., Karila, L., Cavalier, E., Rolland, B., Riou, C., Bossaert, C., & Chauvin, A., on behalf of the multidisciplinary network PROTOSIDE. (2025). Addressing the Global Challenge of Nitrous Oxide Misuse Through a Multidisciplinary Approach: Example of the PROTOSIDE Network. Toxics, 13(6), 466. https://doi.org/10.3390/toxics13060466