|Classification and external resources|
A cytokine storm, also known as cytokine cascade and hypercytokinemia, is a potentially fatal immune reaction consisting of a positive feedback loop between cytokines and white blood cells, with highly elevated levels of various cytokines.
When the immune system is fighting pathogens, cytokines signal immune cells such as T-cells and macrophages to travel to the site of infection. In addition, cytokines activate those cells, stimulating them to produce more cytokines. Normally, the body keeps this feedback loop in check. However, in some instances, the reaction becomes uncontrolled, and too many immune cells are activated in a single place. The precise reason for this is not entirely understood but may be caused by an exaggerated response when the immune system encounters a new and highly pathogenic invader. Cytokine storms have potential to do significant damage to body tissues and organs. If a cytokine storm occurs in the lungs, for example, fluids and immune cells such as macrophages may accumulate and eventually block off the airways, potentially resulting in death.
The cytokine storm (hypercytokinemia) is the systemic expression of a healthy and vigorous immune system resulting in the release of more than 150 known inflammatory mediators (cytokines, oxygen free radicals, and coagulation factors). Both pro-inflammatory cytokines (such as Tumor necrosis factor-alpha, Interleukin-1, and Interleukin-6) and anti-inflammatory cytokines (such as interleukin 10 and interleukin 1 receptor antagonist) are elevated in the serum of patients experiencing a cytokine storm.
Cytokine storms can occur in a number of infectious and non-infectious diseases including graft versus host disease (GVHD), acute respiratory distress syndrome (ARDS), sepsis, Ebola, avian influenza, smallpox, and systemic inflammatory response syndrome (SIRS). Cytokine storm may also be induced by certain medications. The experimental drug TGN1412 caused extremely serious symptoms  likely due to a cytokine storm when given to six participants in a Phase I trial.
Role in pandemic deaths
It is believed that cytokine storms were responsible for the disproportionate number of healthy young adult deaths during the 1918 influenza pandemic, which killed 50 to 100 million people. In this case, a healthy immune system may have been a liability rather than an asset. Preliminary research results from Hong Kong also indicated this as the probable reason for many deaths during the SARS epidemic in 2003. Human deaths from the bird flu H5N1 usually involve cytokine storms as well. Recent reports of high mortality among healthy young adults in the 2009 swine flu outbreak has led to speculation that cytokine storms could be responsible for these deaths, since the Swine Flu results from the same influenza strain as the 1918 pandemic. However, the Centers for Disease Control and Prevention (CDC) has indicated that symptoms reported from this strain are similar to those of normal seasonal flu, with the CDC stating that there is "insufficient information to date about clinical complications of this variant of swine-origin influenza A (H1N1) virus infection." Cytokine storm has also been implicated in hantavirus pulmonary syndrome.
In 2006, a medical study at Northwick Park hospital in England almost resulted in the deaths of 6 volunteers. Parexel, a German company, in one of its own documents, wrote about the trial and said TGN1412 could cause a cytokine storm - the dangerous reaction the men experienced.
A 2003 report in the Journal of Experimental Medicine published by researchers at Imperial College London demonstrates the possibility of preventing a cytokine storm by inhibiting or disabling T cell response. A few days after T cells are activated, they produce a molecule called OX40 (also known as CD134), a "survival signal" that keeps activated T cells working at the site of inflammation during infection with influenza or other pathogens. The ligand of OX40, called OX40 ligand (OX40L, TNFSF4, gp34), which is expressed by antigen presenting cells, binds to OX40 on T cells, preventing them from dying and subsequently increasing cytokine production. A combined protein, OX40-immunoglobulin (OX40-Ig), a human-made fusion protein, prevents OX40 ligand from reaching OX40 on T cells, thus reducing the T cell response. Experiments in mice have demonstrated that OX40-Ig can reduce the symptoms associated with an immune overreaction while allowing the immune system to fight off the virus successfully. By blocking the OX40 receptor on T cells, researchers were able to prevent the development of the most serious flu symptoms in these experimental mice. These results were the subject of an article in the science magazine New Scientist. The drug, to be made by a company called Xenova Research (Xenova Research was purchased by Celtic Pharma, a private equity firm, in September 2005), was supposed to be in phase I clinical trial in 2004, but its status is currently unknown.
In addition, preliminary data has shown that simvastatin induced down-regulation of OX40 and OX40L mRNA and protein in a concentration-dependent manner, and antagonized the interferon-gamma-induced increase in OX40 and OX40L mRNA and protein levels. Further, serum levels of soluble OX40L and matrix metalloproteinase 9 levels were significantly reduced in patients with atherosclerotic cerebral infarction who were treated for 6 months with routine therapy plus simvastatin (n = 46) compared with patients receiving routine therapy alone (n = 30).
ACE inhibitors and angiotensin II receptor blockers
The renin angiotensin system (RAS) has been implicated in the mediation of the cytokine storm, suggesting a potential benefit for angiotensin converting enzyme (ACE) inhibitors and angiotensin II receptor blockers (ARBs), and ACE has been implicated in inflammatory lung pathologies. Shigehara et al. published research confirming that serum angiotensin-converting enzyme (ACE) is a useful marker for disease activity in cytokine-mediated inflammatory lung disease. Marshall and co-workers also found that angiotensin II was associated with cytokine-mediated lung injury and suggested a role for ACE inhibitors.
Wang and co-workers published data that cytokine-mediated pulmonary damage (apoptosis of lung epithelial cells) in response to the pro-inflammatory cytokine TNF-alpha (implicated in the cytokine storm) requires the presence of angiotensin II, suggesting that ARBs might have clinical utility in this setting.
Das published a review of ACE inhibitor and angiotensin-II receptor blocker use in a number of cytokine-mediated inflammatory pathologies and suggested that ACE inhibitors and Angiotensin receptor blockers have theoretical benefit in downregulation of the cytokine storm.
Although frequently employed to treat patients experiencing the cytokine storm associated with ARDS, corticosteroids and NSAIDs have been evaluated in clinical trials and have shown no effect on lung mechanics, gas exchange, or beneficial outcome in early established ARDS.
Preliminary data has shown that gemfibrozil, an agent that inhibits production of proinflammatory cytokines in addition to its clinically useful lipid-lowering activity, increased survival in BALB/c mice that were already ill from infection by influenza virus A/Japan/305/57 (H2N2). Gemfibrozil was administered intraperitoneally once daily from days 4 to 10 after intranasal exposure to the virus. Survival increased from 26% in vehicle-treated mice (n = 50) to 52% in mice given gemfibrozil at 60 mg/kg/day (n = 46) (P = 0.0026). If this principle translates to patients, a drug already approved for human use, albeit by a different route for another purpose, might be adapted relatively fast for use against influenza, conceivably including human infection with a derivative of the avian H5N1 strain.
Free radical scavengers
Preliminary data from clinical trials involving patients with sepsis-induced ARDS have shown a reduction in organ damage and a trend toward improvement in survival (survival in ARDS is approximately 60%) after administering or upregulating a variety of free radical scavengers (antioxidants).
Some types of arthritis medications are designed to reduce inflammation by inhibiting the tumor necrosis factor-alpha pathway to immune cell activation; these drugs are known as TNF-alpha blockers. One study found that three different TNF-alpha blockers afforded a slight reduction in antibody presentation after vaccination against influenza in a group of immunocompromised patients, however it did not significantly affect patients' protective factor gained from inoculation. More research is necessary before any conclusions may be made regarding the efficacy of TNF-alpha blockers at reducing the effects of a cytokine storm in hospitalized flu patients.
- Autoimmune disease
- Catastrophic antiphospholipid syndrome
- Vitamin D and respiratory tract infections
- 1993 Four Corners hantavirus outbreak
- Osterholm MT (2005-05-05). "Preparing for the Next Pandemic". The New England Journal of Medicine 352 (18): 1839–1842. doi:10.1056/NEJMp058068. PMID 15872196.
- Murphy, K.; Travers, P.; Walport, M. (2007). "Signaling Through Immune System Receptors.". Janeway's Immunobiology. (7th ed.). London: Garland. ISBN 0-8153-4123-7.
- Horst Ibelgaufts (2013-04-07). "COPE article about systemic inflammatory response". Copewithcytokines.de. Retrieved 2013-04-17.
- Drazen, Jeffrey M.; Cecil, Russell L.; Goldman, Lee; Bennett, J. Claude (2000). Cecil Textbook of Medicine (21st ed.). Philadelphia: W.B. Saunders. ISBN 0-7216-7996-X.
- Thelancetoncology (February 2007). "Leading Edge: High stakes, high risks". Lancet Oncology (The Lancet) 8 (2): 85. doi:10.1016/S1470-2045(07)70004-9. PMID 17267317.
- Coghlan A (2006-08-14). "Mystery over drug trial debacle deepens". Health. New Scientist. Retrieved 2009-04-29.
- Ferrara JL, Abhyankar S, Gilliland DG (February 1993). "Cytokine storm of graft-versus-host disease: a critical effector role for interleukin-1". Transplant Proc. 2 (25): 1216–1217. PMID 8442093.
- Huang KJ, Su IJ, Theron M, Wu YC, Lai SK, Liu CC, Lei HY (February 2005). "An interferon-gamma-related cytokine storm in SARS patients". Journal of Medical Virology 75 (2): 185–94. doi:10.1002/jmv.20255. PMID 15602737.
- Haque A, Hober D, Kasper LH (October 2007). "Confronting Potential Influenza A (H5N1) Pandemic with Better Vaccines". Emerging Infectious Diseases 13 (10): 1512–8. doi:10.3201/eid1310.061262. PMC 2851514. PMID 18258000.
- Lacey M McNeil DG Jr (2009-04-24). "Fighting Deadly Flu, Mexico Shuts Schools". NYTimes.com. Retrieved 2009-04-29.
- "Interim Guidance for Clinicians on Identifying and Caring for Patients with Swine-origin Influenza A (H1N1) Virus Infection". Centers for Disease Control and Prevention (CDC). 2009-04-29. Retrieved 2009-04-29.
- Mori M, Rothman AL, Kurane I, Montoya JM, Nolte KB, Norman JE, Waite DC, Koster FT, Ennis FA (1999). "High Levels of Cytokine‐Producing Cells in the Lung Tissues of Patients with Fatal Hantavirus Pulmonary Syndrome". The Journal of Infectious Diseases 179 (2): 295–302. doi:10.1086/314597. PMID 9878011.
- Humphreys IR, Walzl G, Edwards L, Rae A, Hill S, Hussell T (2003-10-20). "A Critical Role for OX40 in T Cell–mediated Immunopathology during Lung Viral Infection". J Exp Med. 198 (8): 1237–1242. doi:10.1084/jem.20030351. PMC 2194232. PMID 14568982.
- Bhattacharya S (2003-10-20). "New flu drug calms the 'storm'". New Scientist. Retrieved 2009-04-29.
- "OX-40 Clinical Trial details". Clinicaltrials.gov. Retrieved 2013-04-17.
- Liu B, et al. (2009). "Simvastatin reduces OX40 and OX40 ligand expression in human peripheral blood mononuclear cells and in patients with atherosclerotic cerebral infarction". J Int Med 37 (3): 601–10. PMID 19589242.
- Genctoy G, Altun B, Kiykim AA, Arici M, Erdem Y, Cağlarg M, Yasavul U, Turgan C, Cağlar S (February 2005). "TNF alpha-308 genotype and renin-angiotensin system in hemodialysis patients: an effect on inflammatory cytokine levels?". Artif Organs 29 (2): 174–178. doi:10.1111/j.1525-1594.2005.29029.x. PMID 15670287.
- Moldobaeva A, Wagner EM (December 2003). "Angiotensin-converting enzyme activity in ovine bronchial vasculature". J Appl Physiol (Department of Medicine, Johns Hopkins University) 95 (6): 2278–2284. doi:10.1152/japplphysiol.00266.2003 (inactive 2015-01-01). PMID 12897028.
- Shigehara K, Shijubo N, Ohmichi M, Kamiguchi K, Takahashi R, Morita-Ichimura S, Ohchi T, Tatsuno T, Hiraga Y, Abe S, Sato N (April 2003). "Increased circulating interleukin-12 (IL-12) p40 in pulmonary sarcoidosis". Clin Exp Immunol (Sapporo Medical University School of Medicine) 132 (1): 152–157. doi:10.1046/j.1365-2249.2003.02105.x. PMC 1808667. PMID 12653850.
- Marshall RP, Gohlke P, Chambers RC, Howell DC, Bottoms SE, Unger T, McAnulty RJ, Laurent GJ (January 2004). "Angiotensin II and the fibroproliferative response to acute lung injury". Am J Physiol Lung Cell Mol Physiol (Royal Free and University College London Medical School) 286 (1): 156–164. doi:10.1152/ajplung.00313.2002. PMID 12754187.
- Wang R, Alam G, Zagariya A, Gidea C, Pinillos H, Lalude O, Choudhary G, Oezatalay D, Uhal BD (November 2000). "Apoptosis of lung epithelial cells in response to TNF-alpha requires angiotensin II generation de novo". J Cell Physiol (The Cardiovascular Institute, Michael Reese Hospital and Medical Center) 185 (2): 253–259. doi:10.1002/1097-4652(200011)185:2<253::AID-JCP10>3.0.CO;2-#. PMID 11025447.
- Das UN (May 2005). "Angiotensin-II behaves as an endogenous pro-inflammatory molecule". The Journal of the Association of Physicians of India 53: 472–6. PMID 16124358.
- Budd A, Alleva L, Alsharifi M, et al. (Aug 2007). "Increased Survival after Gemfibrozil Treatment of Severe Mouse Influenza". Antimicrob Agents Chemother 51 (8): 2965–8. doi:10.1128/AAC.00219-07. PMC 1932503. PMID 17562808.
- Gelinck LB, van der Bijl AE, Beyer WE, Visser LG, Huizinga TW, van Hogezand RA, Rimmelzwaan GF, Kroon FP (May 2008). "The effect of anti-tumour necrosis factor alpha treatment on the antibody response to influenza vaccination". Annals of the Rheumatic Diseases 67 (5): 713–6. doi:10.1136/ard.2007.077552. PMID 17965123.