scholarly journals Chronic Restraint Stress Promotes Lymphocyte Apoptosis by Modulating Cd95 Expression

2000 ◽  
Vol 191 (8) ◽  
pp. 1423-1428 ◽  
Author(s):  
Deling Yin ◽  
David Tuthill ◽  
R. Allan Mufson ◽  
Yufang Shi
Keyword(s):  
Immune System ◽  
Physical Restraint ◽  
Endogenous Opioids ◽  
Terminal Deoxynucleotidyl Transferase ◽  
Opioid Receptor Antagonists ◽  
Induced Changes ◽  
Blocking Antibodies ◽  
Pituitary Adrenal Axis ◽  
Lymphocyte Number

Depending on the duration and severity, psychological tension and physical stress can enhance or suppress the immune system in both humans and animals. Although it is well established that stress alters the release of various hormones and neurotransmitters, the mechanisms by which stress affects immune responses remain elusive. We report here that mice subjected to chronic 12-hour daily physical restraint for two days exhibited a significant reduction in splenocytes, a process likely mediated by apoptosis as demonstrated by the terminal deoxynucleotidyl transferase–mediated deoxyuridine triphosphate nick end labeling assay. CD95 (Fas/APO-1) expression in splenic lymphocytes of stressed mice was substantially increased. Interestingly, Fas-immunoglobulin fusion protein and blocking antibodies against CD95 ligand inhibit stress-induced reduction in lymphocytes. The stress-induced changes in CD95 expression and lymphocyte number could be blocked by naltrexone or naloxone, specific opioid receptor antagonists, indicating a pivotal role of endogenous opioids in this process. In addition, the reduction of splenocytes in this model system seems to be independent of the hypothalamo-pituitary-adrenal axis, as both adrenalectomized and sham-operated mice exhibited similar responses to chronic stress. Moreover, chronic physical restraint failed to induce a decrease in lymphocyte numbers in CD95-deficient (Faslpr/lpr) mice. Therefore, stress modulates the immune system through CD95-mediated apoptosis dependent on endogenous opioids.

Cannabinoid-induced changes in the immune system: The role of microRNAs

2021 ◽  
Vol 98 ◽  
pp. 107832
Author(s):  
Hirva K. Bhatt ◽  
Dana Song ◽  
Gyen Musgrave ◽  
P.S.S. Rao
Keyword(s):  
Immune System ◽  
Induced Changes

scholarly journals The aetiology of social deficits within mental health disorders: The role of the immune system and endogenous opioids

2019 ◽  
Author(s):  
Sarah Jane Charles ◽  
Miguel Farias ◽  
R. I. M. Dunbar
Keyword(s):  
Mental Health ◽  
Immune System ◽  
Mental Health Disorders ◽  
Social Bonding ◽  
Endogenous Opioids ◽  
Future Research ◽  
Endogenous Opioid System ◽  
Endogenous Opioid ◽  
Health Disorders

The American National Institute for Mental Health (NIMH) has put out a set of research goals that include a long-term plan to identify more reliable endogenous explanations for a wide variety of mental health disorders (Insel, 2013). In response to this, we have identified a major symptom that underlies multiple mental health disorders – social bonding dysfunction. We suggest that endogenous opioid abnormalities can lead to altered social bonding, which is a symptom of various mental health disorders, including depression, schizophrenia and ASD. This article first outlines how endogenous opioids play a role in social bonding. Then we show their association with the body’s inflammation immune function, and review recent literature linking inflammation to mental health ‘immunophenotypes’. We finish by explaining how these immunophenotypes may be caused by alterations in the endogenous opioid system. This is the first overview of the role of inflammation across multiple disorders where we provide a biochemical explanation for why immunophenotypes might exist across diagnoses. We propose a novel mechanism of how the immune system may be causing ‘sickness-type’ behaviours (fatigue, appetite change, social withdrawal and inhibited motivation) in those who have these immunophenotypes. We hope that this novel aetiology can be used as a basis for future research in mental health.

scholarly journals PERAN SISTEM IMUN TERHADAP TERJADINYA PNEUMONIA TERKAIT STROKE

2020 ◽  
Vol 36 (4) ◽  
Author(s):  
Al Rasyid
Keyword(s):  
Immune System ◽  
Immune Cells ◽  
Medical Complication ◽  
Response Suppression ◽  
Proinflammatory Response ◽  
Two Factors ◽  
System Activation ◽  
Hypothalamus Pituitary Adrenal Axis ◽  
Pituitary Adrenal Axis

THE ROLE OF IMMUNE SYSTEM ON THE OCCURRENCE OF STROKE- ASSOCIATED PNEUMONIAABSTRACTStroke associated pneumonia (SAP) is one of the medical complication which associated with high mortality rate. Several studies conclude two factors involve significantly in pathophysiology of SAP, one of which is immunodepression state. Immunodepression occurs by 3 main pathways, symphathetic system activation, parasymphathetic system activation, and HPA (hypothalamus-pituitary-adrenal)  axis activation. Simultaneously, they induce proinflammatory response suppression and immune cells alternation, which lead to an infection like pneumonia. Therefore, establishing an effective immunomodulation therapy could be one of the main focus in comprehensive stroke management’s future studies.Keywords: Immunodepression, stroke-associated pneumoniaABSTRAKKomplikasi pneumonia terkait stroke menjadi salah satu faktor penyebab mortalitas tertinggi. Studi-studi menyimpulkan bahwa ada dua faktor yang berperan pada patofisiologi pneumonia, salah satunya adalah imunodepresi terkait stroke. Imunodepresi terjadi melalui 3 jaras, yaitu aktivitas simpatis, aktivitas parasimpatis, dan aksis hipotalamus- pituitari-adrenal. Secara simultan, ketiganya menekan respons proinflamasi dan mengubah sel-sel imun sehingga pneumonia dapat mudah terjadi. Pembuatan terapi imunomodulasi yang dapat mencegah infeksi namun tidak memperburuk kondisi iskemia dapat menjadi fokus studi penanganan stroke komprehensif di masa datang.Kata kunci: Imunodepresi, pneumonia terkait stroke  

Plasma interleukin-6 during strenuous exercise: role of epinephrine

2001 ◽  
Vol 281 (3) ◽  
pp. C1001-C1004 ◽  
Author(s):  
Adam Steensberg ◽  
Anders Dyhr Toft ◽  
Peter Schjerling ◽  
Jens Halkjær-Kristensen ◽  
Bente Klarlund Pedersen
Keyword(s):  
Interleukin 6 ◽  
Treadmill Running ◽  
Strenuous Exercise ◽  
Epinephrine Infusion ◽  
Exercise Induced ◽  
Induced Changes ◽  
Response To Exercise ◽  
Lymphocyte Number ◽  
Peak Value

Exercise induces increased levels of plasma interleukin-6 (IL-6) as well as changes in the concentration of lymphocytes and neutrophils. The aim of this study was to investigate a possible role for epinephrine. Seven healthy men participated in an exercise experiment. One month later they received an epinephrine infusion. The exercise consisted of treadmill running at 75% of maximal O2 consumption for 2.5 h. The infusion trial consisted of 2.5 h of epinephrine infusion calculated to reach the same plasma epinephrine levels seen during the exercise experiment. The plasma concentration of IL-6 increased 29-fold during exercise, with peak levels at the end of exercise. The increase in plasma IL-6 during epinephrine infusion was only sixfold, with the peak value at 1 h after infusion. The lymphocyte concentration increased to the same levels during exercise and epinephrine infusion. The lymphocyte count decreased more in the postexercise period than after epinephrine infusion. The neutrophil concentration was elevated threefold in response to exercise, whereas no change was found in response to epinephrine infusion. In conclusion, the exercise-induced increase in plasma IL-6 could not be mimicked by epinephrine infusion. However, epinephrine induced a small increase in IL-6 and may, therefore, partly influence the plasma levels of IL-6 during exercise. In addition, the results support the idea that epinephrine plays a role in exercise-induced changes in lymphocyte number, whereas epinephrine does not mediate exercise-induced neutrocytosis.

Digital x-ray mapping of nanometer-size supported bimetallic catalysts

1988 ◽  
Vol 46 ◽  
pp. 530-531
Author(s):  
L. T. Germinario
Keyword(s):  
Background Radiation ◽  
Metal Cluster ◽  
Single Element ◽  
Beam Diameter ◽  
X Rays ◽  
X Ray ◽  
Major Interest ◽  
Induced Changes

Understanding the role of metal cluster composition in determining catalytic selectivity and activity is of major interest in heterogeneous catalysis. The electron microscope is well established as a powerful tool for ultrastructural and compositional characterization of support and catalyst. Because the spatial resolution of x-ray microanalysis is defined by the smallest beam diameter into which the required number of electrons can be focused, the dedicated STEM with FEG is the instrument of choice. The main sources of errors in energy dispersive x-ray analysis (EDS) are: (1) beam-induced changes in specimen composition, (2) specimen drift, (3) instrumental factors which produce background radiation, and (4) basic statistical limitations which result in the detection of a finite number of x-ray photons. Digital beam techniques have been described for supported single-element metal clusters with spatial resolutions of about 10 nm. However, the detection of spurious characteristic x-rays away from catalyst particles produced images requiring several image processing steps.

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