Inflammation Part 11: Resolution and Intervention

Inflammation: Resolution and Intervention

Dicken Weatherby, N.D. and Beth Ellen DiLuglio, MS, RDN, LDN

The ODX Inflammation Series

1. Inflammation Part 1 - The Fire Inside - Overview
2. Inflammation Part 2 - The Fire Inside - "Inflammaging"
3. Inflammation Part 3 - A Focus on Cytokines
4. Inflammation Part 4 - Cytokines & Their Functions
5. Inflammation Part 5 - The Cytokine Storm
6. Inflammation Part 6 - Cytokine Biomarkers
7. Inflammation Part 7 - Establishing Cytokine Ranges
8. Inflammation Part 8 - Interleukin 6
9. Inflammation Part 9 - Interleukin 10
10. Inflammation Part 10 - The IL-6 : IL-10 Ratio
11. Inflammation Part 11 - Resolution & Intervention

Remember that inflammation serves a purpose, including killing off pathogens and clearing away damaged tissue and debris. However, resolution of inflammation is the key to healing and recovery.

Inflammation can be dampened down with anti-inflammatory cytokines IL-10 and IL-37; with IL-1 and TNF receptors acting as “decoys;” and via the presence of endogenous corticosteroids and catecholamines. [1]

However, recall that impairing IL-6 classic signaling and allowing prolonged immunoparalysis can be detrimental.

The arachidonic acid (AA) pathway of inflammation mediators. In the simplified pathway for the eicosanoid metabolic pathway, AA is released from membrane stores by phospholipase 2 (PLA2). AA is metabolized to biological mediators by three enzymatic pathways: cyclooxygenase, lipoxygenase, and cytochrome P450. Each pathway contains enzyme-specific steps that result in a wide variety of bioactive compounds that drive the pro-inflammatory (prostaglandins) response. After lipid mediator class-switching at the height of inflammation, the pro-resolving mediators-lipoxins begin to drive inflammation resolution. Eicosapentaenoic acid and docosahexaenoic acid-derived from dietary sources produce the E-series of resolvins and D-series of resolvins, maresins, and protectins, respectively, which are important pro-resolving mediators in progressing the resolution of inflammation.

Source: Rea, Irene Maeve et al. “Age and Age-Related Diseases: Role of Inflammation Triggers and Cytokines.” Frontiers in immunology vol. 9 586. 9 Apr. 2018, This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).

Anti-inflammatory diet

It should come as no surprise that a diet based on a wide variety of fresh whole foods is rich in micronutrients and anti-inflammatory compounds. On the other obvious hand, a pro-inflammatory diet based on processed food and “fast food” is laden with pro-inflammatory compounds and inherently deficient in micronutrients.

Characteristics of an anti-inflammatory diet include: [2] [3] [4] [5] [6] [7]  

Researchers observe that a Western-style diet is associated with non-communicable chronic disease and metaflammation (metabolic inflammation). It is often accompanied by a variety of factors related to suboptimal health including [8]

• Abdominal obesity
• Air pollution exposure
• Decreased HDL cholesterol
• Dysbiosis
• Elevated stress
• Hyperglycemia
• Hypertension
• Hypertriglyceridemia
• Insulin resistance

An underlying link between diet and inflammation is the fact that dietary constituents can have pro- and anti-inflammatory effects. [9]

Anti-inflammatory

• Fruits, vegetables
• Phytonutrients, phytochemicals
• Select spices, herbs, seasonings
• Macrobiotic diet
• Mediterranean diet

Pro-inflammatory

• Cholesterol [oxidized]
• Trans fats
• Saturated fats
• Fast food diet

Dietary Inflammatory Index (DII)

Researchers scored and indexed a sample of 45 foods for inflammatory potential based on well-known inflammatory markers: IL-1β, IL-4, IL-6, IL-10, TNF-α, and C-reactive protein.

Research revealed that a pro-inflammatory diet was associated with elevated serum levels of hs-CRP, IL-6, and TNF-alpha. [10]

Within the DII, values were assigned to the foods studied to reflect inflammatory potential:

• +1 if a food/component significantly increased IL-1B, IL-6, TNF-alpha, CRP; or if it decreased IL-4 or IL-10.
• -1 if it significantly decreased IL-1B, IL-6, TNF-alpha, CRP; or if it increased IL-4 or IL-10.
• Zero if no effects were noted

Dietary Inflammatory Index Scores included:

Fast food diet:                 +4.07

Mediterranean diet:        -3.96

Macrobiotic diet              -5.54

Highlights of an anti-inflammatory diet include an abundance of fresh fruits and vegetables, herbs and spices, omega-3 sources, and minimally processed foods.

Omega-3 fatty acids exert anti-inflammatory effects by suppressing IL-1, IL-6, and TNF-alpha. Excess omega-6 linoleic acid, on the other hand, promotes inflammation, platelet aggregation, and oxidation of LDL. [11]

• Omega-3 EPA and DHA from dietary sources accumulate in the cell membrane phospholipid bilayer where they can be recruited for conversion to resolvins, maresins, and protectins, pro-resolving mediators that help resolve inflammation, relieve pain, regenerate tissues, and restore function. [12] The Standard American Diet is notoriously low in omega-3 fats.
• Decreasing the ratio of omega-6 to omega-3 intake (to 4:1 or less) and increasing consumption of omega-3 EPA and DHA can have anti-inflammatory effects. Such an improved ratio promotes increased production of anti-inflammatory eicosanoids such as PGE3 and leukotriene B5, and decreased production of pro-inflammatory eicosanoids such as PGE2 and leukotriene B4. [13]

Many herbs and spices are incorporated into traditional diets for flavor, but also for their anti-inflammatory properties. Herbs and spices tend to be scarce in the Western diet.

Studies have been conducted in an LPS-stimulated macrophage model revealing that various herbs, spices, and fruits exhibited anti-inflammatory effects by reducing IL-6 or TNF-alpha, enhancing IL-10 production, or by reducing COX-2 or iNOS. The most significant effects of these tested were seen with allspice, basil, bay leaves, black pepper, chili pepper, licorice, nutmeg, oregano, sage, and thyme. Increasing intake of foods rich in anti-inflammatory compounds and antioxidants can not only reduce risk of cancer but of neurodegenerative diseases including Alzheimer’s and Parkinson’s. [14]

Curcumin, an active constituent of the spice turmeric, appears to exert anti-inflammatory effects in humans, possibly via its ability to enhance IL-10 action, scavenge free radicals, enhance antioxidant activity, and influence signaling pathways. [15] [16]

Flavonoids from plant-based foods (fruits, vegetables, grains, roots, tea, wine), honey, and propolis provide a number of health benefits including anti-oxidant and anti-inflammatory actions. [17]  

It is important to remember that some natural supplements that may “boost” immunity could theoretically exacerbate an already heightened immune system. These compounds include echinacea purpura, garlic extracts, astragalus, and Andrographis. [18]

Inflammation: Resolution and intervention - Optimal Takeaways    

So, our optimal takeaways for inflammation with a focus on cytokines include:

• Inflammation is associated with a wide variety of acute and chronic diseases and disorders.
• Inflammation is an underlying factor in several diseases including CVD, IBD, asthma, neurodegenerative diseases, autoimmune diseases, depression, obesity, COVID-19, and diseases ending in -itis.
• Inflammation is beneficial early on during injury and infection but chronic prolonged inflammation damages tissues and promotes chronic disease.
• Select biomarkers can help monitor inflammation but there are many variables that can affect concentrations.
• Cytokines are a complex group of compounds that can have both anti- and pro-inflammatory effects.
• Monitoring IL-1B, IL-6, IL-8, IL-10, and TNF-alpha is being integrated into clinical evaluation of inflammatory disease
• Cytokine storm and prolonged immunoparalysis can have fatal effects.
• It’s important to monitor the literature for updated information on cytokines due to their dynamic nature and wide range of functions.
• Resolution, prevention, and intervention all share common characteristics:
  • Healthy whole-food, plant-based diet
  • Active lifestyle
  • Minimization of exposure to toxins, pesticides, pollution, radiation, oxidation
  • Stress management
• Dietary components possess both pro- and anti- inflammatory potential.
• The Dietary Inflammatory Index scores 45 foods for their inflammatory potential
• A Western-style diet, especially combined with a sedentary lifestyle and excess toxin exposure, is pro-inflammatory and associated with chronic preventable diseases including cardiovascular disease, type 2 diabetes, and high blood pressure.
• A Mediterranean-style diet rich in fruits, vegetables, olive oil, and omega-3 fats can serve as a model for balancing and reducing inflammation. [19] Regular exercise and moderate calorie restriction will enhance these effects.

Additional reading [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43]

Research

[1] Rea, Irene Maeve et al. “Age and Age-Related Diseases: Role of Inflammation Triggers and Cytokines.” Frontiers in immunology vol. 9 586. 9 Apr. 2018,.

[2] Mahan, L. Kathleen; Raymond, Janice L. Krause's Food & the Nutrition Care Process - E-Book (Krause's Food & Nutrition Therapy). Elsevier Health Sciences. Kindle Edition.

[3] Weil Anti-inflammatory diet. https://www.drweil.com/diet-nutrition/anti-inflammatory-diet-pyramid/dr-weils-anti-inflammatory-food-pyramid/

[4] Mediterranean diet. Oldways.  https://oldwayspt.org/resources/oldways-mediterranean-diet-pyramid

[5] Sears, Barry. “Anti-inflammatory Diets.” Journal of the American College of Nutrition vol. 34 Suppl 1 (2015): 14-21. 

[6] Institute for Natural Medicine. https://naturemed.org/what-is-an-anti-inflammatory-diet/

[7] Rupp, Heinz et al. “Risk stratification by the "EPA+DHA level" and the "EPA/AA ratio" focus on anti-inflammatory and antiarrhythmogenic effects of long-chain omega-3 fatty acids.” Herz vol. 29,7 (2004): 673-85. doi:10.1007/s00059-004-2602-4 [R]

[8] Christ, Anette et al. “Western Diet and the Immune System: An Inflammatory Connection.” Immunity vol. 51,5 (2019): 794-811. doi:10.1016/j.immuni.2019.09.020 [R] [R]

[9] Steck, S. E. S. N., et al. "The dietary inflammatory index: a new tool for assessing diet quality based on inflammatory potential." Digest 49.3 (2014): 1-10. [R] [R]

[10] Steck, S. E. S. N., et al. "The dietary inflammatory index: a new tool for assessing diet quality based on inflammatory potential." Digest 49.3 (2014): 1-10. [R] [R]

[11] Simopoulos, Artemis P. “The omega-6/omega-3 fatty acid ratio, genetic variation, and cardiovascular disease.” Asia Pacific journal of clinical nutrition vol. 17 Suppl 1 (2008): 131-4. [R]

[12] Rea, Irene Maeve et al. “Age and Age-Related Diseases: Role of Inflammation Triggers and Cytokines.” Frontiers in immunology vol. 9 586. 9 Apr. 2018, doi:10.3389/fimmu.2018.00586 [R] This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).

[13] Wall, Rebecca et al. “Fatty acids from fish: the anti-inflammatory potential of long-chain omega-3 fatty acids.” Nutrition reviews vol. 68,5 (2010): 280-9. doi:10.1111/j.1753-4887.2010.00287.x [R]

[14] Mueller, Monika, Stefanie Hobiger, and Alois Jungbauer. "Anti-inflammatory activity of extracts from fruits, herbs and spices." Food Chemistry 122 (2010): 987-996 [R]

[15] Mollazadeh, Hamid et al. “Immune modulation by curcumin: The role of interleukin-10.” Critical reviews in food science and nutrition vol. 59,1 (2019): 89-101. doi:10.1080/10408398.2017.1358139 [R] [R]

[16] Hunter, Philip. “The inflammation theory of disease. The growing realization that chronic inflammation is crucial in many diseases opens new avenues for treatment.” EMBO reports vol. 13,11 (2012): 968-70. doi:10.1038/embor.2012.142 [R]

[17] Zeinali, Majid et al. “An overview on immunoregulatory and anti-inflammatory properties of chrysin and flavonoids substances.” Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie vol. 92 (2017): 998-1009. doi:10.1016/j.biopha.2017.06.003 [R] [R]

[18] Young, Trevor K, and John G Zampella. “Supplements for COVID-19: A modifiable environmental risk.” Clinical immunology (Orlando, Fla.) vol. 216 (2020): 108465. doi:10.1016/j.clim.2020.108465 [R] Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content

[19] Rea, Irene Maeve et al. “Age and Age-Related Diseases: Role of Inflammation Triggers and Cytokines.” Frontiers in immunology vol. 9 586. 9 Apr. 2018, doi:10.3389/fimmu.2018.00586 [R] This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).

[20] Korniluk, A et al. “From inflammation to cancer.” Irish journal of medical science vol. 186,1 (2017): 57-62. doi:10.1007/s11845-016-1464-0 [R]

[21] Stone, William L., et al. “Pathology, Inflammation.” StatPearls, StatPearls Publishing, 27 August 2020. [R]

[22] Dinarello, Charles A. “Overview of the IL-1 family in innate inflammation and acquired immunity.” Immunological reviews vol. 281,1 (2018): 8-27. doi:10.1111/imr.12621 [R]

[23] Rose-John, Stefan. “Interleukin-6 Family Cytokines.” Cold Spring Harbor perspectives in biology vol. 10,2 a028415. 1 Feb. 2018.

[24] Schett, Georg et al. “How cytokine networks fuel inflammation: Toward a cytokine-based disease taxonomy.” Nature medicine vol. 19,7 (2013): 822-4.

[25] Clendenen, Tess V et al. “Factors associated with inflammation markers, a cross-sectional analysis.” Cytokine vol. 56,3 (2011): 769-78. 

[26] Garbers, Christoph et al. “Plasticity and cross-talk of interleukin 6-type cytokines.” Cytokine & growth factor reviews vol. 23,3 (2012): 85-97. 

[27] Barnes, Theresa C et al. “The many faces of interleukin-6: the role of IL-6 in inflammation, vasculopathy, and fibrosis in systemic sclerosis.” International journal of rheumatology vol. 2011 (2011): 721608. 

[28] Hartman, Joshua, and William H Frishman. “Inflammation and atherosclerosis: a review of the role of interleukin-6 in the development of atherosclerosis and the potential for targeted drug therapy.” Cardiology in review vol. 22,3 (2014): 147-51. 

[29] Spooren, Anneleen et al. “Interleukin-6, a mental cytokine.” Brain research reviews vol. 67,1-2 (2011): 157-83. 

[30] Munkholm, Klaus et al. “Cytokines in bipolar disorder vs. healthy control subjects: a systematic review and meta-analysis.” Journal of psychiatric research vol. 47,9 (2013): 1119-33. 

[31] Valkanova, Vyara et al. “CRP, IL-6 and depression: a systematic review and meta-analysis of longitudinal studies.” Journal of affective disorders vol. 150,3 (2013): 736-44. 

[32] Candido, Juliana, and Thorsten Hagemann. “Cancer-related inflammation.” Journal of clinical immunology vol. 33 Suppl 1 (2013): S79-84. 

[33] Lippitz, Bodo E. “Cytokine patterns in patients with cancer: a systematic review.” The Lancet. Oncology vol. 14,6 (2013): e218-28. 

[34] Astrom, Maj-Briit et al. “Persistent low-grade inflammation and regular exercise.” Frontiers in bioscience (Scholar edition) vol. 2 96-105. 1 Jan. 2010, 

[35] Suzuki, Katsuhiko. "Cytokine response to exercise and its modulation." Antioxidants 7.1 (2018): 17.

[36] Suzuki, Katsuhiko et al. “Systemic inflammatory response to exhaustive exercise. Cytokine kinetics.” Exercise immunology review vol. 8 (2002): 6-48. 

[37] Munasinghe, Lalani L et al. “The association of serum 25-hydroxyvitamin D concentrations with elevated serum ferritin levels in normal weight, overweight and obese Canadians.” PloS one vol. 14,3 e0213260. 7 Mar. 2019.

[38] Kappert, Kai et al. “Assessment of serum ferritin as a biomarker in COVID-19: bystander or participant? Insights by comparison with other infectious and non-infectious diseases.” Biomarkers : biochemical indicators of exposure, response, and susceptibility to chemicals, 1-36. 23 Jul. 2020.

[39] Mehta, Puja et al. “COVID-19: consider cytokine storm syndromes and immunosuppression.” Lancet (London, England) vol. 395,10229 (2020): 1033-1034. 

[40] Sinha, Pratik et al. “Is a "Cytokine Storm" Relevant to COVID-19?.” JAMA internal medicine vol. 180,9 (2020): 1152-1154. 

[41] Cena, Hellas, and Marcello Chieppa. “Coronavirus Disease (COVID-19-SARS-CoV-2) and Nutrition: Is Infection in Italy Suggesting a Connection?.” Frontiers in immunology vol. 11 944. 7 May. 2020.

[42] Panickar, Kiran S, and Dennis E Jewell. “The beneficial role of anti-inflammatory dietary ingredients in attenuating markers of chronic low-grade inflammation in aging.” Hormone molecular biology and clinical investigation vol. 23,2 (2015): 59-70. 

[43] Shirani, Fatemeh, Farzin Khorvash, and Arman Arab. "Review on selected potential nutritional intervention for treatment and prevention of viral infections: possibility of recommending these for Coronavirus 2019." International Journal of Food Properties 23.1 (2020): 1722-1736.