Chronic muscle fatigue: the role of hormonal and stress factors

2018 ◽  
Vol 69 (3) ◽  
Author(s):  
Teet Seene ◽  
Karin Alev ◽  
Priit Kaasik
Keyword(s):  
Muscle Fatigue ◽  
Stress Factors

scholarly journals Should the BCRA1/2-mutations healthy carriers be valid candidates for hematopoietic stem cell donation?

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Alberto Fresa ◽  
Simona Sica
Keyword(s):  
Hematological Malignancies ◽  
Conditioning Regimen ◽  
Stress Factors ◽  
Brca Mutations ◽  
Hematopoietic Stem ◽  
Mutational Status ◽  
Stem Cell Donation ◽  
Radiation Treatments ◽  
Healthy Carriers

AbstractIt’s still not clear whether the mutational status of BRCA-mutated healthy hematopoietic stem cells (HSCs) donors could have an impact on the engraftment. Comparing the studies present in literature, we focused on the correlation between BRCA mutations and the development of hematological malignancies and Fanconi anemia (FA); then, we explored HSCs types, frequencies, and functions in the presence of BRCA mutations, as well as the reconstitution of hematopoiesis after chemotherapy and radiation treatments. The role of BRCA mutations in the FA showed a possible involvement in the onset of the disease; the mutation carriers, indeed, did not show any sign of the typical phenotype of the FA. BRCA mutational status can be considered as a risk factor for hematological malignancies, but only for secondary malignancies and/or in the presence of bone marrow stress factors. Currently we don’t know if a conditioning regimen could be compensated by BRCA mutated HSCs, even if murine models tried to show the possible differences between fully mutated, haploinsufficient and normal HSCs. Thus, given the downregulating effect of the mutations on hematopoiesis, it could be questionable to use the HSCs of a BRCA-mutated donor in the presence of another available donor with the same compatibility.

scholarly journals Antioxidant and Signaling Role of Plastid-Derived Isoprenoid Quinones and Chromanols

2021 ◽  
Vol 22 (6) ◽  
pp. 2950
Author(s):  
Beatrycze Nowicka ◽  
Agnieszka Trela-Makowej ◽  
Dariusz Latowski ◽  
Kazimierz Strzalka ◽  
Renata Szymańska
Keyword(s):  
Current Knowledge ◽  
Stress Factors ◽  
Oxygenic Photosynthesis ◽  
Ros Generation ◽  
Main Site ◽  
Storage Lipids ◽  
Abiotic Stress Factors ◽  
Cell Components ◽  
And Function

Plant prenyllipids, especially isoprenoid chromanols and quinols, are very efficient low-molecular-weight lipophilic antioxidants, protecting membranes and storage lipids from reactive oxygen species (ROS). ROS are byproducts of aerobic metabolism that can damage cell components, they are also known to play a role in signaling. Plants are particularly prone to oxidative damage because oxygenic photosynthesis results in O2 formation in their green tissues. In addition, the photosynthetic electron transfer chain is an important source of ROS. Therefore, chloroplasts are the main site of ROS generation in plant cells during the light reactions of photosynthesis, and plastidic antioxidants are crucial to prevent oxidative stress, which occurs when plants are exposed to various types of stress factors, both biotic and abiotic. The increase in antioxidant content during stress acclimation is a common phenomenon. In the present review, we describe the mechanisms of ROS (singlet oxygen, superoxide, hydrogen peroxide and hydroxyl radical) production in chloroplasts in general and during exposure to abiotic stress factors, such as high light, low temperature, drought and salinity. We highlight the dual role of their presence: negative (i.e., lipid peroxidation, pigment and protein oxidation) and positive (i.e., contribution in redox-based physiological processes). Then we provide a summary of current knowledge concerning plastidic prenyllipid antioxidants belonging to isoprenoid chromanols and quinols, as well as their structure, occurrence, biosynthesis and function both in ROS detoxification and signaling.

Effect of low chloride on relaxation in hamster diaphragm muscle

1986 ◽  
Vol 61 (1) ◽  
pp. 180-184 ◽  
Author(s):  
S. A. Esau ◽  
N. Sperelakis
Keyword(s):  
Membrane Potential ◽  
Muscle Fatigue ◽  
Time Constant ◽  
Diaphragm Muscle ◽  
Resting Membrane Potential ◽  
Krebs Solution ◽  
Sarcolemmal Membrane ◽  
Cl Conductance

With muscle fatigue the chloride (Cl-) conductance of the sarcolemmal membrane decreases. The role of lowered Cl- conductance in the prolongation of relaxation seen with fatigue was studied in isolated hamster diaphragm strips. The muscles were studied in either a Krebs solution or a low Cl- solution in which half of the NaCl was replaced by Na-gluconate. Short tetanic contractions were produced by a 160-ms train of 0.2-ms pulses at 60 Hz from which tension (T) and the time constant of relaxation were measured. Resting membrane potential (Em) was measured using KCl-filled microelectrodes with resistances of 15–20 M omega. Mild fatigue (20% fall in tension) was induced by 24–25 tetanic contractions at the rate of 2/s. There was no difference in Em or T in the two solutions, either initially or with fatigue. The time constant of relaxation was greater in low Cl- solution, both initially (22 +/- 3 vs. 18 +/- 5 ms, mean +/- SD, P less than 0.05) and with fatigue (51 +/- 18 vs. 26 +/- 7 ms, P less than 0.005). Lowering of sarcolemmal membrane Cl- conductance appears to play a role in the slowing of relaxation of hamster diaphragm muscle seen with fatigue.

Role of PtrXTH1 and PnXTH1 Genes Encoding Xyloglucan Endo-Transglycosylases in Regulation of Growth and Adaptation of Plants to Stress Factors

2018 ◽  
Vol 65 (1) ◽  
pp. 38-48
Author(s):  
B. R. Kuluev ◽  
Z. A. Berezhneva ◽  
A. V. Knyazev ◽  
Yu. M. Nikonorov ◽  
A. V. Chemeris
Keyword(s):  
Stress Factors ◽  
Genes Encoding ◽  
Regulation Of Growth

scholarly journals Role of salicylic acid in acclimation to low temperature

2013 ◽  
Vol 61 (2) ◽  
pp. 161-172 ◽  
Author(s):  
M. Pál ◽  
O. Gondor ◽  
T. Janda
Keyword(s):  
Salicylic Acid ◽  
Low Temperature ◽  
Plant Species ◽  
Membrane Integrity ◽  
Stress Factors ◽  
Limiting Factors ◽  
Wide Range ◽  
Metabolic Reactions ◽  
Related Compounds

Low temperature is one of the most important limiting factors for plant growth throughout the world. Exposure to low temperature may cause various phenotypic and physiological symptoms, and may result in oxidative stress, leading to loss of membrane integrity and to the impairment of photosynthesis and general metabolic processes. Salicylic acid (SA), a phenolic compound produced by a wide range of plant species, may participate in many physiological and metabolic reactions in plants. It has been shown that exogenous SA may provide protection against low temperature injury in various plant species, while various stress factors may also modify the synthesis and metabolism of SA. In the present review, recent results on the effects of SA and related compounds in processes leading to acclimation to low temperatures will be discussed.

scholarly journals ACCUMULATION BEHAVIOUR OF ALLANTOIN IN THE UNDERGROUND PHYTOMASS OF THE BORAGINACEAE FAMILY AND ITS ROLE IN ADAPTING THE PLANTS TO ADVERSE ENVIRONMENTAL FACTORS

2019 ◽  
Vol 14 (1) ◽  
pp. 126-136
Author(s):  
A. Ya. Tamakhina ◽  
A. A. Akhkubekova ◽  
A. B. Ittiev
Keyword(s):  
Solar Radiation ◽  
Sea Level ◽  
Low Temperatures ◽  
High Performance ◽  
Growing Season ◽  
Stress Factors ◽  
Adaptation To Stress ◽  
Plant Adaptation ◽  
The Family

Aim.The aim of the work described herein was to study the dynamics of allantoin accumulation in the underground phytomass ofEchium vulgareL.,Symphytum caucasicumM. Bieb. andS. asperumLepech. as well as to clarify the role of allantoin in plant adaptation to stress factors.Methods.We studied the roots of plants growing in the foothill (Nalchik, 490–512 m above sea level) and the mountain zones of the Kabardino-Balkarian Republic (Terskol village, 2530 m above sea level; Verkhnyaya Balkaria village, 2680 m above sea level). The roots were collected at the stages of rosetting, flowering, fruiting and at the end of the growing season. Aqueous-alcoholic extracts of shredded roots were analyzed by high-performance liquid chromatography.Results.The highest content of allantoin in the roots ofEchium vulgare,Symphytum caucasicum,S. asperumplants was noted at the end of the growing season, respectively 0.915; 0.342–0.658; 2,842–3,426%. Under conditions of low temperatures and increased solar radiation, the content of allantoin in the roots increases 1.2–1.9 times as compared with the plants of the foothill zone.Conclusion.Allantoin plays an important role in the process of adapting species of the family Boraginaceae to oxidative stress caused by hypothermia and increased solar radiation.

scholarly journals The emerging role of acceptance and commitment therapy as a way to treat trauma and stressor related disorders

BJPsych Open ◽  
2021 ◽  
Vol 7 (S1) ◽  
pp. S290-S290
Author(s):  
Gisela Simões ◽  
Rita Silva
Keyword(s):  
Acceptance And Commitment Therapy ◽  
Psychological Trauma ◽  
Stress Factors ◽  
Future Research ◽  
Clinical Effects ◽  
Addictive Disorders ◽  
Commitment Therapy ◽  
Mesh Terms ◽  
Acceptance And Commitment

AimsThe aim of this work is to gather and evaluate scientific evidence about the clinical effects of Acceptance and Commitment Therapy (ACT) in the treatment of patients with trauma-related Post-Traumatic Stress Disorder (PTSD).MethodA literature search was conducted on PubMed platform, starting from the following MeSH terms: “Acceptance and Commitment Therapy”, “Trauma and Stressor Related Disorders”, “Psychological Trauma”. Studies obtained were analysed, corresponding to investigations based on an adult population with trauma and stressor related disorders.ResultThe search provided 13 results, of which 12 met the defined criteria. Different types of studies with variable samples were considered, including randomised clinical trials, longitudinal observational studies, narrative reviews and an analysis of case reports.Globally, ACT has been showing a crescent role in the treatment of individuals with trauma histories by enhancing positive outcomes and by being associated with greater psychological flexibility. It is increasingly considered to be well-suited to the treatment of trauma by targeting avoidance, coping strategies with emotional disengagement and persistent dissociation, aspects associated with greater PTSD symptom severity and related psychopathology.Furthermore, research suggests that acceptance-based treatments are helpful in promoting emotional, behavioural, and neural changes in psychological disorders characterised by disgust, shame and guilt that commonly co-occur with PTSD.Among the various exposure factors, we found a growing production of recent literature in which ACT has been applied in the context of oncology life-threatening settings, demonstrating significant improvements in symptoms and quality of life, as well as reductions in emotional disturbances, physical pain and traumatic responses.However, little is known about implementation and results of ACT in situations of trauma and psychiatric comorbidities. Data suggest that, when applied to individuals with psychosis and history of trauma, there is an improvement in overall severity and anxiety symptoms, emotion regulation strategies and a greater sense of engagement in care; nevertheless, reduction of specific trauma symptoms remains controversial. More mention is made about the growth of literature evaluating the application of ACT as a conjunctial therapeutic method for trauma and simultaneous addictive disorders.ConclusionOverall, despite limited published research currently available, some evidence starts to support ACT's promising role as an effective psychotherapeutic approach to trauma and stressor related disorders. Its application in situations where organic diseases represent stress factors has been growing. Future research should focus on clarifying the role of ACT in psychiatric comorbidity scenarios, allowing this psychotherapy to help individuals find a meaningful and valuable life beyond trauma.

scholarly journals Psychological conditions for the prevention of recidivism

2020 ◽  
Vol 9 (1) ◽  
pp. 85-93
Author(s):  
A.V. Sechko
Keyword(s):  
Driving Forces ◽  
Delinquent Behavior ◽  
Stress Factors ◽  
Criminal Prosecution ◽  
Economic Problems ◽  
Psychological Conditions ◽  
The Usa ◽  
Time Parameters ◽  
High Degree

The article analyzes the results of a study of recidivism conducted in England, Denmark, Canada, Nigeria, Portugal, New Zealand, the USA, and Scotland. Objective and subjective determinants have been identified that make it possible to predict with a high degree of probability the subsequent criminal prosecution violation, its time parameters. The psychological portrait of the recidivist is described, stress factors of delinquent behavior are revealed. The driving forces of decriminalization of former criminals are revealed. This is an intensive probationary period under the auspices of mentors who are able to build trusting relationships with parole through consistent, non-judgmental actions with the simultaneous possibility of playing the role of guardians of young people in difficult social and criminal settings in solving their economic problems.

Relationship between economic stress factors and stress, anxiety, and depression: Moderating role of social support

2018 ◽  
Vol 268 ◽  
pp. 102-107 ◽  
Author(s):  
João Viseu ◽  
Rita Leal ◽  
Saul Neves de Jesus ◽  
Patrícia Pinto ◽  
Pedro Pechorro ◽  
...  
Keyword(s):  
Social Support ◽  
Economic Stress ◽  
Stress Factors ◽  
Anxiety And Depression ◽  
Moderating Role

In Vitro Study of Antioxidant Activity of Serum and Plasma Samples As Well As Glutathione Exposed to Various Exogenous Stress Factors

2021 ◽  
Author(s):  
Małgorzata Olszowy-Tomczyk ◽  
Łukasz Paprotny ◽  
Agnieszka Celejewska ◽  
Dorota Szewczak ◽  
Dorota Wianowska
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Activity ◽  
Antioxidant Properties ◽  
In Vitro Study ◽  
Stress Factors ◽  
Plasma Samples ◽  
Serum Samples ◽  
Exogenous Stress

Abstract The imbalance between the production of Reactive Oxygen Species (ROS) and their sequestration promotes the formation of so-called oxidative stress conditions which are considered crucial in the aging process and development of many human diseases. Glutathione plays an essential role in the antioxidative barricade against ROS. Its role in the detoxification process of xenobiotics and carcinogen is also known. However, there are no comparative studies on the antioxidant properties of both biological samples and glutathione as well as the change in these properties as a result of exposure to various stress factors. This paper fills this gap comparing the antioxidant activity of serum and plasma samples of the known glutathione content with the activity of glutathione itself assessed by the different methods. In addition, it reveals a significant role of environmental xenobiotics in oxidative stress and differentiates the stress induced by different groups of drugs, among which the greatest one has been demonstrated for antiarrhythmic drugs and cytostatics. More importantly, it proves that human plasma is more resistant to stress factors and N-acetylcysteine clearly promotes the extension of antioxidant properties of both the plasma and serum samples. The latter conclusion is consistent with the implied preventive and/or supportive action of this drug against SARS-CoV-2.

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