Psychoneuroimmunology is the science that links psychological processes and the immune system. Many studies showed that psychological stress has immune modulatory activity. This article describes a typical psycho-neuro-endocrino-immune network in response to acute stress. Finally, it has been shown that acute time limited stressors have immune stimulatory activities which are unnecessary and harmful to one’s homeostasis.

In recent years a novel scientific discipline called psychoneuroimmunology has emerged that examines complex interdependence of the mind, brain, endocrine and immune system in health and disease. Homeostasis (a self-referral phenomenon) plays an important role in keeping a person healthy and it has a fundamental role in host defense. Many studies show that stress (acute or chronic) creates disorder especially in the immune regulation. In this study a typical nervous-endocrine and immune network has been shown in case of stress. From this network Corticotrophin Releasing Factor (CRF), Adrenocorticotrophic Hormone (ACTH), Growth Hormone(GH), prolactin (PRL), Glucocorticoids (GC) and catecholamine are found as important endocrine factors and T cells, B cells, monocytes/macrophages, Natural Killer(NK) cells and their cytokines that is Tumor Necrosis Factor-a (TNF-a), Gamma Interferon (IFN-g) and interleukins such as IL-1, IL-2, IL-4, IL-6, IL-10 etc. are found as important immune factors in most stress related studies. Finally, autoimmune/ inflammatory disease is shown in relation to above endocrine and immune factors. In summary, we have demonstrated psychoneuroimmune alteration in stress and its association with autoimmune/inflammatory disease. The present study suggests the importance of restoring self-referral organization in the body.

The level of antibody titer against infectious bursal disease (IBD) in commercial chickens was determined using comparative sero evaluation through indirect ELISA test method. One hundred chickens of 1 day old were collected from a commercial hatchery and they were divided into two treatment groups named as ‘treatment group’ (flock 1) and ‘control group’ (flock 2). Serum samples of the flocks were collected randomly four times on day 1, 8, 16 and day 28. Serum samples were examined to quantify antibody titer using indirect ELISA method. A variation in the antibody titer was observed among chickens of two different flocks. Mean antibody titers were found at of 8686.4 and 9304.07 in day old chickens of flock 1 and flock 2 respectively. The mean antibody titers 7732 and 6375.15 were found in 8 day chickens of flock 1 and flock 2 respectively. The mean antibody titers 726.25 and 727.5835 were found in 16 days old chickens of flock 1 and flock 2 respectively. These chickens of treatment group (flock 1) were vaccinated with Gumboro live vaccine on days 16 and 21 while chickens of flock 2 were kept without vaccination. Blood samples collected on day 28 from both vaccinated and nonvaccination flocks were subjected to ELISA. The average antibody titers 2520.75 was found in 28 days old chickens of flock 1 after vaccination but the average antibody titers 110 was found in nonvaccinated flock 2. The day old samples contained high level of antibody titer on average and the level gradually declined and persisted up to 15-20 days. On day 28, the level of antibody reached much above minimum protection level in vaccinated chickens but the level was much below the protection level in nonvaccinated chickens. The results suggest that chicks should be vaccinated at around day 14, when the antibody level reaches to nearly minimum protection level.

Hantaviruses are primarily rodent-borne pathogens which have received considerable attention recently due to their high mortality rates in humans. In order to find the causes of rapid transmission and emergence of hantavirus-associated diseases anthropogenic changes are a priority. These include deforestation, urbanization, noise pollution, light pollution and electromagnetic fields, all of which have been shown to profoundly affect rodent physiology and immunology. Moreover, anthropogenic events promote human-rodent co-habitation and thereby provide a driver to increase rates of transmission and, by extrapolation, levels of infection in humans. Such environmental disruption acts as a chronic stressor to rodents and causes elevated concentrations of glucocorticoids, which are a major class of immunosuppressive hormone. Glucocorticoids are responsible for altering the immune tolerance of rodents, thereby rendering them susceptible to infection. Glucocorticoids induce regulatory T lymphocytes to reduce inflammatory and antiviral responses and to activate regulatory responses, principally through production of the cytokines interleukin-10 and transforming growth factor-β to support viral persistence. In order to develop a low-cost intervention strategy for hantavirus infection consideration should be given to a systemic approach to therapy. This would both aim to achieve a reduction of anthropogenic stressors and to gain a greater understanding of host-pathogen interactions.

Hantaviruses commonly infect rodents in which they do not cause any significant symptoms of disease. In contrast, humans serve occasionally as a dead-end host when they inadvertently become infected through the bite of an infectious rodent or via contact with its urine, faeces and/or saliva. The virus was first recognized in the 1970s as a cause of severe haemorrhagic fever. The outcome is fatal in up to 50% of cases due to renal or pulmonary failure. At present, there is no preventive or curative treatment. Current research aims to determine the possible role of anthropogenic events in disease outbreaks and to explain how hantaviruses persist in rodent reservoirs. In seeking effective therapies, focus is drawn to the immunity of these natural hosts which permits infection but without causing pathology. If this protective response could be harnessed by artificial means in humans, this may provide a rational basis for vaccine or drug design.

Chronic Stress plays a significant role in the progression of tumor angiogenesis through the secretion of Catecholamines, which take part in increased production of IL-6 and VEGF. Chronic psychological stress induces secretion of catecolamines such as epinephrine (E) and noreepinephrine (NE) from adrenal medulla and sympathetic neurons which activate β-adrenergic receptors on tumor cells, which in turn enhances increased production of IL-6. IL-6 then plays a significant role in VEGF production through STAT3 activation. Il-6 follows a series of signaling cascades including cAMP/PKA and MAPK. NF-kB activation through MEK/ERK is crucial for IL-6 production. Angiogenesis, the formation of new blood vessels from preexisting vasculatures is mediated by VEGF. It also takes part in cell proliferation, cell migration and vasculogenesis, thus leading to tumor angiogenesis. The aim of this study was to know the relationship between chronic stress and tumor angiogenesis and to highlight the therapeutic point where further works may proceed on.

Because of the complex causal factors leading to depression, epigenetics is of considerable interest for the understanding effect of stress in depression. Dopamine is a key neurotransmitter important in many physiological functions, including motor control, mood, and the reward pathway. These factors lead many drugs to target Dopamine receptors in treating depressive disorders. In this review, we try to portray how chronic stress as an epigenetic factor changes the gene regulation pattern by interrupting Dopamine signaling mechanism.

Psychoneuroimmunology is the newly evolved science that describes the interaction between mind and body, mediated by reciprocal communications among the nervous, endocrine, and immune systems. This paper reviews the interrelationship between chronic psychological stress and cellular immunity during the progression of cancer. The immune system possesses the specialized defense mechanisms where an extensive network of immune cells exists through their cytokine milieu, which in turn can get highly affected by psychological stress. Under stressful conditions, the body increases the production of glucocorticoids via hypothalamic pituitary adrenal (HPA) axis. Glucocorticoids (GCs) suppress the cell mediated immunity (CMI) by reducing the production of cytokines and other effector molecules through the inhibition of transcription factors responsible for cytokine gene expression, mediated by glucocorticoid receptor. GCs inhibit the activities of natural killer (NK) cells, cytotoxic T lymphocytes (CTL), T helper (Th) cells, natural killer T (NKT) cells, macrophages and dendritic cells which play a vital role in tumor suppression. Th1 cytokines which activate the NK cell, CTL and macrophages are also inhibited by GCs. GCs are able to alter the appearance of macrophages and dendritic cells, providing pro-tumor activities, and also able to inhibit the antigen presentation which causes dysfunction of the adaptive immune response against tumor. GCs have been shown to reduce the expression of perforin, granzymes, tumor necrosis factor (TNF)- α, interferon (IFN)- γ, Fas, TNF receptor activation induced ligand (TRAIL), and other effector molecules which have direct effects in tumor destruction. Additionally, glucocorticoids induce tolerogenic dendritic cells and stimulate the Treg cells to block the NK cell, CTL, NKT cell, and Th cell activity. Finally, it has been shown that chronic psychological stress exerts different immunomodulatory activities which facilitate the progression of cancer.

Psychological stress has extreme adverse consequences on health. However, the molecular mechanisms that mediate and accelerate the process of aging due to stress hormone are not well defined. This review has focused on diverse molecular paths that come out in response to chronic psychological stress via releasing of excessive glucocorticoids (GCs), involved in the aging process. GCs suppress transcription of nuclear cell adhesion molecules which impair synaptic plasticity, memory formation, and cognitive ability. Again, GCs promote muscle atrophy by means of motivating ubiquitin proteasome system and can repress muscle protein synthesis by inhibition of PI3-kinase/Akt pathway. GCs also inhibit interleukin-2 synthesis through suppressing T cell receptor signal that leads to loss of T cell activation, proliferation, and B-cell activation. Moreover, GCs increase the expression of collagenase-3, RANK ligand, and colony stimulating factor-1 that induce bone resorption. In general, stress-induced GCs can play causal role for aging and age-related disorders.

From the conventional Bird’s eye, cancer initiation and metastasis are generally intended to be understood beneath the light of classical clonal genetic, epigenetic and cancer stem cell model. But inspite decades of investigation, molecular biology has shown hard success to give Eagle’s eye in unraveling the riddle of cancer. And it seems, tiring Tom runs in vague behind naughty Jerry.

Over recent years there has been great progress in the scientific knowledge of health and well-being and the body's response to stress and the relationship to the development of cancer. This paper reviews the interrelationship between stress and cancer. The immune system is a specialized network whose activity is highly affected by stress. Stress activates the body's endocrine (hormone) system, which in turn can cause changes in the immune system, the body's defense against infection and disease including cancer. Under stressful conditions the body increases the production of catecholamines via sympathetic nervous system (SNS). Catecholamines suppress certain parts of the immune system and reduce the production of molecules that create inflammation. Catecholamines suppress the cell-mediated immunity (CMI) by reducing macrophages and Th production of type 1 cytokines (e.g. IL-12, TNF-α and IFN-γ), and by stimulating the release of immunosuppressive factors including IL-10 and TGF-α. Hormones associated with SNS activation may favour angiogenic mechanisms in human tumours. In response to chronic stress, catecholamines such as epinephrine and norepinephrine released from the sympathetic nervous system activate b-adrenergic receptors on tumour cells and enhance expression of vascular endothelial growth factor (VEGF), IL-6 and matrix metalloproteinases (MMPs). Stress can also activate the cAMP response element-binding (CREB) protein and create a hypoxic condition. CREB protein and hypoxia regulated genes, e.g. endothelin-1, adrenomedullin, Bcl-2 has been found that are involved in mitogenesis, tumour progression, angiogenesis and apoptosis. Psychosocial stressors and distress have been shown to have direct effects on intracellular processes that are implicated in cancer initiation. Stress may alter cellular DNA repair abilities, may increase the likelihood of retention of damaged DNA, and therefore increase the likelihood of development of malignant cells.