In functional integrative medicine, as we work to understand the root causes of chronic disease, we often encounter a subset of patients who do not seem to respond to typical lifestyle and nutritional support therapies. While the role of mitochondria in cellular energy production and especially within our immune system is well-established, modern research has uncovered an important cellular signaling system in health and disease—the cell danger response, or CDR.
What Is the Cell Danger Response?
Robert Naviaux, MD, PhD is the foremost researcher on this topic. The CDR is the evolutionarily conserved metabolic response that protects cells and hosts from harm. It is triggered by encounters with chemical, physical, or biological threats that could harm the cell.1 Abnormal persistence of the CDR can ultimately lead to organ dysfunction and result in chronic disease.
The mediation of this CDR is through purinergic signaling, or the signaling of molecules such as adenosine triphosphate (ATP). Within cells, ATP is a critical energy source, but extracellular ATP or eATP acts as a danger signal to the cell and activates the CDR, which initiates additional changes in metabolism and mitochondrial function.1
Mitochondria and the Cell Danger Response
Once the CDR has been activated, there are three key checkpoints and stages of the healing cycle that must progress before healing can occur. If the CDR gets stuck at any of these stages, chronic disease will be the result.
CDR Stage 1
CDR1 is the stage of containment and innate immunity (inflammation) and is metabolically characterized by glycolysis and high levels of eATP.2 During this stage, mitochondria predominate with the rounder M1 morphology, replacing mitochondrial membrane lipids with more saturated fatty acids, resulting in stiffer membranes and poorer energy production.2
CDR Stage 2
After progressing through the CP1 checkpoint, the cell enters the CDR2 phase, which is characterized by cellular proliferation, aerobic glycolysis, and moderate levels of eATP. At this point, undifferentiated M0 mitochondria are recruited from neighboring stem cells.
CDR Stage 3
After the CP2 checkpoint, the cell enters CDR3, which is characterized by autonomous oxidative phosphorylation and cellular differentiation and remodeling. At this point, eATP is low and M2 mitochondria (which have a more filamentous morphology) increase with an anti-inflammatory effect and more efficient energy production.2
Return to Cellular Health and Safety
Lifestyle and Nutrient Support for Membranes and Mitochondria
To better support health, there are several tools and nutrients that can be used to help restore cellular and mitochondrial membrane function.
Supportive lifestyle approaches include adequate sleep, exercise, fasting and caloric restriction.5
Nutrients that support the mitochondria include L-carnitine, alpha lipoic acid and CoQ10.3 Other promising tools include membrane lipid replacement, which replenishes cell membranes with omega-3 fatty acids, and phospholipids like phosphatidylcholine that improve membrane fluidity and function.4
The Bottom Line
The United States now spends $2.8 trillion annually on medical care for children and adults with chronic conditions.5 The
collective exposure to thousands of natural and man-made chemicals keeps cells in a cell danger response, impeding progression
to healing. Understanding how the cell danger response plays a role in these chronic conditions can help you support your patients.5
Kareem Kandil, MD, ND is the Immune Foundations Clinical Brand Manager at Lifestyle Matrix Resource Center. Upon graduating from medical school at Ross University School of Medicine, Dr. Kandil went on to do an observership in integrative medicine and then pursued his Doctorate of Naturopathic Medicine (ND) at National University of Health Sciences in Lombard, IL.
- Naviaux RK. Metabolic features of the cell danger response. Mitochondrion. 2014;16:7-17. https://doi.org/10.1016/j.mito.2013.08.006
- Naviaux RK. Metabolic features and regulation of the healing cycle—A new model for chronic disease pathogenesis and treatment. Mitochondrion. 2019;46:278-297. https://doi.org/10.1016/j.mito.2018.08.001
- Nicolson GL, Ash ME. Membrane Lipid Replacement for chronic illnesses, aging and cancer using oral glycerolphospholipid formulations with fructooligosaccharides to restore phospholipid function in cellular membranes, organelles, cells and tissues. Biochim Biophys Acta Biomembr . 2017;1859(9 Pt B):1704-1724. https://doi.org/10.1016/j.bbamem.2017.04.013
- Nicolson GL, Ash ME. Lipid Replacement Therapy: a natural medicine approach to replacing damaged lipids in cellular membranes and organelles and restoring function. Biochim Biophys Acta. 2014;1838(6):1657-1679. https://doi.org/10.1016/j.bbamem.2013.11.010
- Naviaux RK. Perspective: Cell danger response Biology—The new science that connects environmental health with mitochondria and the rising tide of chronic illness. Mitochondrion. 2020;51:40-45. https://doi.org/10.1016/j.mito.2019.12.005