|Year : 2020 | Volume
| Issue : 1 | Page : 9-17
|Molecular signature of the immune response to yoga therapy in stress-related chronic disease conditions: An insight
HN Venkatesh1, H Ravish2, C R Wilma Delphine Silvia3, H Srinivas4
1 Department of Human Genetics, NIMHANS, Bangalore, India
2 Department of Neurochemistry, NIMHANS, Bangalore, India
3 Department of Biochemistry, Bowring and Lady Curzon Medical College and Research Institute, Bangalore, India
4 Department of Biochemistry, Maulana Azad Medical College, New Delhi, India
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|Date of Submission||15-Nov-2018|
|Date of Acceptance||16-Sep-2019|
|Date of Web Publication||16-Dec-2019|
| Abstract|| |
The world Health Organization defines health as complete well-being in terms of physical, mental and social, and not merely the absence of disease. To attain this, individual should adapt and self-mange the social, physical and emotional challenges of life. Exposure to chronic stress due to urbanization, work stress, nuclear family, pollution, unhealthy food habits, lifestyle, accidental death in the family, and natural calamities are the triggering factors, leading to hormonal imbalance and inflammation in the tissue. The relationship between stress and illness is complex; all chronic illnesses such as cardiovascular disease and asthma have their root in chronic stress attributed by inflammation. In recent times, yoga therapy has emerged as an important complementary alternative medicine for many human diseases. Yoga therapy has a positive impact on mind and body; it acts by incorporating appropriate breathing techniques and mindfulness to attain conscious direction of our awareness of the present moment by meditation, which helps achieve harmony between the body and mind. Studies have also demonstrated the important regulatory effects of yoga therapy on brain structure and functions. Despite these advances, the cellular and molecular mechanisms by which yoga therapy renders its beneficial effects are inadequately known. A growing body of evidence suggests that yoga therapy has immunomodulatory effects. However, the precise mechanistic basis has not been addressed empirically. In this review, we have attempted to highlight the effect of yoga therapy on immune system functioning with an aim to identify important immunological signatures that index the effect of yoga therapy. Toward this, we have summarized the available scientific evidence showing positive impacts of yoga therapy. Finally, we have emphasized the efficacy of yoga in improving physical and mental well-being. Yoga has been a part of Indian culture and tradition for long; now, the time has come to scientifically validate this and implement this as an alternative treatment method for stress-related chronic disease.
Keywords: Cytokines, immune response, inflammation, yoga
|How to cite this article:|
Venkatesh H N, Ravish H, Delphine Silvia C R, Srinivas H. Molecular signature of the immune response to yoga therapy in stress-related chronic disease conditions: An insight. Int J Yoga 2020;13:9-17
|How to cite this URL:|
Venkatesh H N, Ravish H, Delphine Silvia C R, Srinivas H. Molecular signature of the immune response to yoga therapy in stress-related chronic disease conditions: An insight. Int J Yoga [serial online] 2020 [cited 2022 Jan 20];13:9-17. Available from: https://www.ijoy.org.in/text.asp?2020/13/1/9/273022
| Introduction|| |
The word “stress” was coined by Hans Selye in 1956 who defined it as “nonspecific response of the human body to any demand for change.” Stress worsens human physiology and triggers autonomic activity, which may damage human body at the physical, mental, or emotional level. Stress may be triggered by external (from the environment, psychological, or social situations) or internal (illness and surgery) factors. Stress leads to negative health outcomes in all the stages of life starting from childhood to elderly.
According to the American Psychological Association, mental stress is known to have adverse effects on health, which has negative impact on multiple organs/systems such as immune, cardiovascular, neuroendocrine, and central nervous system (CNS). Stress is rapidly increasing recent times. Stress is reported to be a common contributing factor in 75%–90% of chronic diseases. To lead a healthy life, it has become essential to reduce the negative effects of stress in day-to-day life. Mental stress can be managed in many different ways, for example, by practicing meditation and alternative holistic therapy like music. Yoga is an ancient Indian method to reduce stress, because yoga employs various physical and mental relaxation methods such as asana, breathing exercises, chants, and meditation. It helps in the integration of mind, body, and spirit and thus improves mental and physical health by stress reduction. The National Center for Complementary and Alternative Medicine (NCCAM) has recommended yoga as mind–body medicine. In this review, we have discussed about various aspects of stress-related diseases and the effect of yoga in ameliorating stress-induced changes in human body. Stress can effect the morphology and function of the brain.
In chronic stress, high level of cortisol increases metabolic rate and decreases synaptic densities in hippocampus and prefrontal cortex (PFC). PFC volume negatively correlates with stress, specifically in white matter of ventrolateral and dorsolateral regions. Anxiety mood disorders, are reported to be aggravated due to stress-induced modifications in the PFC. Stress also impacts the prefrontal gamma-aminobutyric acid (GABA) pathways impairing the function of limbic structures, which are known to control emotions and behavior. Cortisol released due to stress activates enlarged amygdala. Perceived stress reduction was reported with yoga intervention, and this was also found to decrease basolateral amygdala gray matter density [Figure 1].
|Figure 1: Diagram showing interrelation of chronic stress and inflammation and its effect on endocrine system|
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| Impact of Stress on Human Body|| |
Stress is perceived uncomfortable emotional experience accompanied by predictable biochemical, physiological, and behavioral changes due to disturbance in normal homeostasis. Susceptibility to stress varies from person to person and depends on genetic factors, coping style, type of personality, and social support. Studies have shown that short-term stress provides the driving energy to help the persons to tide over the situations such as examinations or work deadlines. However, chronic stress has a significant impact on immune system, cardiovascular, neuroendocrine, and CNS. Psychological stress alters insulin production leading to diabetes, gastric secretions leading to peptic ulcers, gastric carcinoma, ulcerative colitis, etc.
Immune system closely interacts with CNS while maintaining the physiological homeostasis as well as in regulating cytokine release and mounting inflammatory response against infection. There exists bidirectional communication between CNS and immune system. Neurotransmitters (NTs) as well as immune mediators play important role in CNS-immune system cross talk. NTs released from anoxic terminal of nerve cells reach immune cells by synaptic or nonsynaptic transmission. Nonsynaptically transmitting molecules reach the target cells by diffusion or via the circulating blood. Synaptic NTs are packaged into vesicles, and they are released after reaching the synaptic cleft of target cells; effects of NTs can have stimulatory or inhibitory effects, which depends on activation of receptors, located on postsynaptic cells. In case of stress, NTs activate glial cells, such as astrocytes and microglial cells, resulting in cytokine production. Chronic stress in Alzheimer's disease (AD) leads to increase in amyloid beta (Aβ) assembly and neurofibrillary tangles (NFT). NFT and increased assembly of amyloid beta in the brain can activate immune system and induce the inflammation. Overproduction of pro-inflammatory cytokines causes imbalance of pro-inflammatory and anti-inflammatory pathways that causes impairment in brain functions. The cytokine imbalance might eventually result in irreversible damage of brain cells, thus contributing to chronic neuropsychological disorders.
Stress hormones such as cortisol and catecholamines are produced by the hypothalamic–pituitary–adrenocortical(HPA) axis and sympathetic nervous system (SNS), respectively. The SNS stimulates the adrenal medulla to produce catecholamines (e.g., epinephrine). In parallel, the periventricular nucleus of the hypothalamus produces corticotrophin-releasing factor, which, in turn, stimulates the pituitary to produce adrenocorticotropin. Adrenocorticotropin, in turn, stimulates the adrenal cortex to secrete cortisol-like glucocorticoids (GCs). GCs, catecholamines, cytokines, and other mediators released during stress are thought to be main mediators of stress-induced tissue/organ damage. Cortisol is also known to involve in stress response and immune homeostasis. In acute stress, “fight-or-flight” response of our body responds with hypermobilization of energy to combat stress situations. Chronic state of fight-and-flight response leads to hypervigilance resulting from repeated firing of HPA axis, thus causing dysregulation of normal body system leading to manifestation of stress-related diseases such as diabetes, depression, obesity, and cardiovascular diseases. Increased production of cortisol interferes with homeostatic metabolism of Fats, proteins, and carbohydrates; it increases glucose through gluconeogenesis, causes diabetics, suppresses the immune system, and causes retention of sodium and water by the kidneys, with subsequent increased blood volume and blood pressure. Stress leads to increase in blood cholesterol levels and free fatty acid levels in serum, by stimulating adrenaline and noradrenaline release, causing mobilization of free fatty acids and cholesterol from adipose tissue. The free fatty acid and oxidized cholesterol particles get deposited in the arterial wall and are predisposing factors for cardiac problems and stoke. Chronic stress can also lead to plaque buildup in the arteries, causing atherosclerosis, especially in persons with a high-fat diet and sedentary living. Chronic stress in asthma also leads to the release of histamine, which can trigger severe bronchoconstriction.
Stressful life event has stronger correlation with psychiatric illnesses such as depression and schizophrenia. Stress of all kinds is thought to play a significant role in the development of depression by depleting body's “positive” NTs, such as GABA, serotonin, and dehydroepiandrosterone. In addition, dysfunctional dopaminergic and serotonergic systems are also involved in the development of depression. Deregulated HPA axis is also often reported in those with depressive disorder., HPA axis gets hyperactivated in response to abnormal physical or psychological stress, which by disturbing the sympathetic and parasympathetic systems increases cortisol and catecholamines. Increased levels of catecholamines suppress T lymphocytes and thus suppress the immune system and ultimately cause an illness. Chronic stress in pregnant women may cause increased levels of glucocorticoids and proopiomelanocortin during pregnancy and this is shown to effect the embryonic limbic neuronal migration and synaptogenesis in the foetus. Stress induced corticosteroids during pregnancy and postnatal periods, affects postnatal development, by changing the production pattern of cortical limbic receptor and mesocorticolimbic system, leading to risk of dysfunctional maturation in infancy.
| Role of Yoga Therapy in Chronic Diseases|| |
The world Health Organization defines health as complete well-being in terms of physical, mental and social, and not merely the absence of disease. To attain this, individual should adapt and self-mange the social, physical and emotional challenges of life. Yoga therapies are designed to self-manage social, physical, and emotional challenges of life. The concept of yoga was perceived as back as 5000 years ago in the Indian subcontinent [Figure 2]. Yoga is an ancient Indian way of healing, which includes specific techniques such as asana, breathing exercises, chants, and meditation to attain the highest level of consciousness., It encourages integration of mind and body to improve mental and physical health by stress reduction. India's proposal of celebrating International Yoga Day on June 21st every year was accepted by 177 member states under the United Nations., and in recent reports showed there are 20 million people practicing yoga in U.S. Medical yoga is defined as prevention and treatment of medical conditions by incorporating holistic approach, appropriate breathing techniques, mindfulness, and meditation, in order to achieve harmony between the functions of the body and mind for self-realization. In yoga, it is said that “loss of the connection with self is the main cause that creates disease.” Yoga therapy has shown promising outcomes for the treatment of a myriad number of brain as well as somatic diseases such as depression, anxiety, posttraumatic stress, schizophrenia, autism, learning disorders obesity, heart diseases, AD, diabetes, depression, gastrointestinal problems, asthma, headaches, hypertension, chronic low back pain, ulcers, and multiple sclerosis., However, even-though chronic stress is implicated in many health problems, it is necessary to scientifically validate yoga therapy for reducing stress. This will have significant impact in better understanding and management of chronic disease conditions and their management. Yoga is able to “reverse” harmful molecular reactions involving DNA and significantly alter the modification of histones (H4ac and H3K4me3) by silencing several histone deacetylase genes (HDAC 2, 3, and 9). These changes might lead to modification of inflammatory pathways by decreasing both NF-kB and cytokine level and thus leading to lower levels of inflammation.
|Figure 2: Diagrammatic representation of impact of stress on human body in disease manifestation|
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| Downregulation of Inflammatory Response in Chronic Disease by Yoga Practice|| |
The positive benefits of yoga therapies are achieved partly by reducing inflammation and improving various immunological parameters of immune response. Stretch exercise for 90 min has shown to increase salivary human β-defensin 2 (HBD-2) levels by HBD-2 expression rate. HBD-2 is an antimicrobial peptide, exerts their effects by destroying the hydrophobic core of lipid bilayers of microbes, and prevents infections. They are expressed in epithelial cells of oral cavity and respiratory tracts and little is realized in emotional stress. The low cytotoxic activity of NK cells eliminates damaged and cancer cells, thereby increasing cancer risk. Kochupillai et al. have investigated the effects of yogic breathing on numbers of NK cells in cancer patients. NK cell numbers increased significantly above the baseline levels after 12 and 24 weeks of the yoga practice. Witek-Janusek et al. have examined the relationship between mindfulness-based stress reduction (MBSR), including yogic breathing practices, and immune function. Their study involving 96 women with breast cancer, who participated in a MBSR program for 8 weeks, showed increased NK cell activity and cytokine levels compared to non-MBSR group, which included low levels of NK cell activity and interferon (IFN)-γ production and high levels of interleukin-4 (IL-4), IL-6, and IL-10 production. IFN-γ secreted from NK cells and T cells exerts its pro-inflammatory function by activating endothelial cells and macrophages and by promoting differentiation of T helper 1 (Th1) cells; a decrease in serum IFN-γ levels reduces cellular immunity. Researchers have shown that serum IFN-γ levels increase in patients under examination stress. However, patients who practiced yoga for 12 weeks showed lowered IFN-γ levels than the control group. These findings suggest that practice of yoga could inhibit decline in cellular immunity that is associated with psychological stress. Pro-inflammatory cytokines are known to modulate the pathologies of various chronic diseases. The activations of transforming growth factor-β, NF-κB, tumor necrosis factor (TNF)-α, and IL-6 have been reported in the previous studies on chronic obstructive pulmonary disease, chronic kidney disease, obesity, and metabolic syndrome., Yadav et al. have reported that yoga reduces markers of oxidative stress and inflammation in 86 patients with chronic inflammatory diseases who participated in a short-term yoga-based lifestyle program for 10 days. The mean level of cortisol decreased and β-endorphins increased from the baseline by day 10 in these patients. The mean reductions in IL-6 and TNF-α levels from the baseline were also observed by day 10. In a study in which breast cancer patients participated in a 12-week yoga program, plasma levels of soluble TNF receptor type II, a marker of TNF activity, remained stable in the yoga group, but increased in the control group. In another study, 12-week Hatha Yoga intervention improved vitality of breast cancer survivors, while reducing the fatigue score and levels of IL-6, TNF-α, and IL-1β 3 months posttreatment. Increasing yoga practice decreases IL-6 and IL-1β production, but not TNF-α production. Therefore, regular yoga exercise might reduce the levels of pro-inflammatory cytokines.
Genome-wide transcriptional profiling identified 282 upregulated genes and 153 downregulated genes after 3 months of yoga in healthy individuals. Yoga increased activity of anti-inflammatory glucocorticoid receptor (GR), which indicates a change in the HPA axis in terms of responding better to cortisol and stopping the stress response more quickly. However, such change in the HPA axis may lead to reduced levels of cortisol; transcription factor NF-κB showed a significant decrease, whereas anti-inflammatory GR and interferon regulatory factors increased and CREB remained the same.,
Association of yoga practice showed a lower risk by modulating TNF alpha and Aβ metabolism, which showed a greater ratio of proteins Aβ42/Aβ40 in dementia. Study by E S Epelet al (2016), observed significantly more TNF-alpha levels in control group (non meditator) than regular and experienced meditator. They also showed the gene expression changes due to meditation leading to significant silencing of two out of six proinflammatory genes (RIPK2 and COX2) in experienced meditator., The extent to which pro-inflammatory genes were silenced was associated with faster cortisol recovery to social stress. On the other hand, the expression of circadian genes was not affected with intensive mindfulness meditation. Unregulated genes were related to energy metabolism, mitochondrial function, insulin secretion, and telomere maintenance in diabetes. Pro-inflammatory genes and pathways get downregulated by yoga therapy are TNF-RII (a marker of TNF activity), IL-1ra, and C-reactive protein (CRP) (inflammatory marker).,, Most studies (81%) that measured the activity of inflammation-related genes and/or NF-κB found a significant downregulation. The previous studies have demonstrated positive effect of physical exercise on IL-6 and CRP.,,,, Physical exercise was found to significantly improve lean muscle mass, BMI, fitness, resting heart rate, systolic blood pressure, and triglycerides to produce benefits in the management of obesity in adolescents. DM and chronic inflammation are strongly related to increased cardiovascular risk. Physical exercise in patients with diabetes improves metabolic profile and exerts anti-inflammatory effects, that is, reduction in IL-6, high-sensitivity CRP (hs-CRP), and TNF-α without weight loss. Increased serum levels of inflammatory mediators have been associated with numerous disorders such as atherosclerosis, Type II diabetes, hypertension, depression, and overall mortality, but intervention of aerobic exercise training can significantly reduce inflammatory mediators. Thus, it can be considered that the yoga interventions would help reduce inflammatory markers and thus contributing to the prevention of various metabolic disorders and future cardiovascular events. Yoga practice has substantial health benefits due to its ability to reduce inflammatory responses. Perceiving this aspect, it has been considered that ancient Indian traditional yoga practice might be helpful in reducing inflammatory markers such as IL-6, TNF-α, and hs-CRP. Yoga practices can be helpful to people of all ages, even to the persons with psychophysiological illness. Shortening of telomere is responsible for aging. Telomere is a part of the chromosomes present at the terminal regions of chromosomes, they are shortened by few nucleotides every time a cell divides, this shortening is implicated in the process that leads to aging. Telomerase is an enzyme that restores partially the lost nucleotide during replications, Yoga practice is shown to increase the expression of two genes related to telomerase (hTR and hTERT), which adds nucleotides at the end of chromosomes that shorten every time a cell divides thus limiting the aging process restriction, and physical activity may lead to decreased blood pressure and help anger management and also increase the expression of telomerase-related genes.
Mechanism of action of yoga is by vagal stimulation by improving baroreflex sensitivity, and reducing inflammatory cytokines, second through parasympathetic activation associated with antistress mechanisms. Yoga reduces perceived stress and HPA axis activation, which improves overall metabolic and psychological profiles. Yogic literature and yogic research amply indicate the utility of yoga practices for achieving a holistic health [Table 1] and [Figure 3] and According to Büssing et al.' (2012) article in Social Work Today magazine, efficacy of yoga as a therapeutic alternative for chronic disease was emphasized.
|Table 1: References of elevation of inflammatory markers in disease conditions and reduction after yoga intervention|
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| Conclusion and Feature Directions|| |
In this review, we have explored the positive effect of yoga on physical as well as psychological well-being. The most important findings were the immune-dampening effects of yoga in various pathological conditions. Yoga was found to reverse the expression of inflammatory mediators and to maintain homeostasis and physiological functions of various other systems that are related to immune responses. Yoga practices downregulate the expression of a master regulator of inflammation and NF-κB and subsequently influenced the reduction of pro-inflammatory cytokines in various chronic stress-induced diseases and also maintain balanced endocrine hormones production.
Although the main focus was on the impact of yoga therapy on immune functions in stress-related chronic disease conditions, yoga was also found to have a significant effect on the functions of various other systems such as autonomic, endocrine, HPA axis, as well as psychological aspects that are generally perturbed under stressful conditions.
Finally, we suggest that yoga has the potential to offer clinical benefits to the patients suffering from chronic diseases caused by stressful live events and improve the overall well-being and work performance. Considering the beneficial effects of yoga in various illnesses and given the differences in yoga module recommended by various yoga schools, it has now become essential to standardize and scientifically validate yoga protocol specific to each disease condition. Besides this, studies focusing on a common set of immune markers across all the diseases should be carried out. This will not only help us understand whether the mode of action of yoga is similar across various illnesses but also aid in identifying a common set of blood-based biomarkers indexing effect of yoga.
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Assistant Professor, Department of Neurochemistry, NIMHANS, Bengaluru
Source of Support: None, Conflict of Interest: None
[Figure 1], [Figure 2], [Figure 3]
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