scholarly journals Szabad gyökök és a máj ischaemiás-reperfúziós károsodása

2015 ◽  
Vol 156 (47) ◽  
pp. 1904-1907 ◽  
Author(s):  
Attila Szijártó
Keyword(s):  
Free Radicals ◽  
Organ Damage ◽  
Systemic Reactions ◽  
Chemical Agents ◽  
Pathophysiological Role ◽  
Polymerase Inhibitor ◽  
Current Article ◽  
Clinical Conditions

The critical importance of the ischemic-reperfusive injury is well documented with regards to numerous organs and clinical conditions. Oxygen free radicals play a central role in the mediation of the injury, which dominantly influences the prevalence of postoperative complications, (long term) organ damage, and the potential manifestation of systemic reactions. The both anatomically and pathophysiologically unique ischemic-reperfusive injury of the liver, which is expressively vulnerable to free radicals, is of utmost importance in liver surgery. Several techniques (adaptive maneuvers, chemical agents) are known to ameliorate the reperfusive injury. Based on the prior research of the workgroup of the author, the aim of the current article is to overview the set of measures capable of attenuating ischemic-reperfusive injury (ischemic preconditioning, -perconditioning, administration of adenosine, -inosine, -levosimendan, and -poly-ADP-ribose-polymerase inhibitor), with special attention to the ischemic-reperfusive injury of the liver, as well as the special pathophysiological role of free radicals in mediating hepatic damage. Orv. Hetil., 2015, 156(47), 1904–1907.

scholarly journals Etiology of differentiated carcinoma of the thyroid current apprehension

2003 ◽  
Vol 50 (3) ◽  
pp. 51-55
Author(s):  
Ruben Han
Keyword(s):  
Animal Experiments ◽  
Growth Control ◽  
Significant Risk ◽  
Ionising Radiation ◽  
Sodium Iodide Symporter ◽  
Chemical Agents ◽  
Tsh Secretion ◽  
Genetic And Environmental Factors

It is apparent that in the last decade carcinoma of the thyroid is becoming increasingly prevalent. The multistage complex theory of thyroid carcinogenesis is based on observations made on cohort patients studies and during animal experiments over a period of last fifty years. The process of thyroid oncogenesis is conceived to be a series of events induced by genetic and environmental factors which alter follicular cells division and growth control. These factors can be considered as initiators (chemical agents and ionising radiation) and promoters (some goitrogenes and drugs). The first class of factors induce incipient tumorigenesis while the second augments TSH secretion and radically increases tumour growth. Normally silent, intracellular proto-oncogenes (of which Ret/PTC series are the most conceived ones) can become activated by chromosomal translocations, deletions or mutations and can transform normal follicular cell into a condition of uncontrolled division and growth. The most significant known cause of thyroid carcinomas in men is exposure to external or internal ionising radiation. Beside that, long-term iodine deficiency, effects of certain chemical carcinogens, drugs and goitrogenes must be considered as significant risk factors. Possible role of sodium/iodide symporter is becoming an objective of the most recent investigations.

scholarly journals Play as a Factor of Harmonious and Disharmonious Development in Childhood

2021 ◽  
Vol 19 (3) ◽  
pp. 31-41
Author(s):  
S.A. Voskresenskaya ◽  
G.V. Kozlovskaya ◽  
M.V. Ivanov
Keyword(s):  
Autism Spectrum Disorders ◽  
Mental State ◽  
Autism Spectrum ◽  
Proximal Development ◽  
Play Activity ◽  
Spectrum Disorders ◽  
Long Term Observation ◽  
Clinical Conditions

The article discusses the problems of the development of play activity, as a reflection of harmonious and disharmonious mental development, starting from an early age. 4030 preschool children (2720 boys and 1310 girls) were examined. For the long-term observation, 150 people (92 boys and 58 girls) were selected. Methods: clinical-psychopathological, neurological, psychological, using the concept of leading activity, focused on the “zone of proximal development”. The article analyzes the role of toys as material objects used by children of different ages and clinical conditions, in the structure of which disorders of the mental state and play activity were found. The clinical picture of mental disorders was determined by disorders of the neurosis-like, affective level in combination with individual schizotypal stigmas, and behavioral disorders within the autism spectrum disorders. Conclusions are made about the possibility of an adverse effect of certain forms of play and play objects on the mental state and development of schizo- typal disorders and autism spectrum disorders.

Degradation of Rubber by Chemical Agents in Solution

1961 ◽  
Vol 34 (4) ◽  
pp. 1212-1219
Author(s):  
G. H. Foxley
Keyword(s):  
Free Radicals ◽  
Low Temperatures ◽  
Model Compound ◽  
Polymer Degradation ◽  
Chain Scission ◽  
Redox Systems ◽  
Chemical Agents ◽  
The Subject ◽  
Partial Fulfillment

Abstract It is clear that the subject of polymer degradation by chemical agents is an active branch of polymer chemistry. This is reflected in the large number of patents applying to polymer degradation and no attempt has been made to include every appropriate patent. Much of the comparative work is based on equal weights, rather than equal numbers of molecules, so that the true comparisons of the efficiency of peptizers are often difficult. It has been shown that polymer degradation can proceed via several mechanisms all of which involve free radicals and the main points can be summarized as follows :— In solutions at low temperatures the initiatory free radicals come from the added peptizer such as benzoyl peroxide or bis-azoisobutyronitrile. Although oxygen accelerates the reaction, it is not essential, and there is appreciable degradation in the absence of oxygen. Thiols are active only when oxygen is present even at high temperature. This is somewhat surprising, since the rubber radicals produced by thermal scission should be just as active as those produced by mastication and be capable of reaction with thiols, and serves to emphasize the importance of the role of oxygen in peptization by thiols and disulfides. Oxygen is also necessary for degradation by redox systems and in its absence structurizing takes place. The lack of work on triphenyl methane derivatives is somewhat surprising in view of the ease with which they undergo homolysis to give free radicals. However, it is not sufficient to introduce any type of free radical and expect degradation: stabilized free radicals are the best peptizers, unstable radicals can add to olefinic bonds and cause crosslinking rather than chain scission. Squalene has been used as a model compound for the study of the reactions of natural rubber with free radicals in a similar manner to the use of methylcyclohexene as a model compound for oxidation studies. This review forms part of a dissertation submitted in partial fulfillment of the requirements for the London University M.Sc. (External) Examination.

scholarly journals The Role of Urine F2-isoprostane Concentration in Delayed Cerebral Ischemia after Aneurysmal Subarachnoid Haemorrhage—A Poor Prognostic Factor

Diagnostics ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 5
Author(s):  
Karol Wiśniewski ◽  
Marta Popęda ◽  
Bartłomiej Tomasik ◽  
Michał Bieńkowski ◽  
Ernest J. Bobeff ◽  
...  
Keyword(s):  
Cerebral Ischemia ◽  
Aneurysmal Subarachnoid Hemorrhage ◽  
Delayed Cerebral Ischemia ◽  
Aneurysmal Subarachnoid Haemorrhage ◽  
Oxidative Stress Biomarkers ◽  
Poor Prognostic Factor ◽  
Non Invasive ◽  
Clinical Conditions

Background: The pathophysiology of delayed cerebral ischemia (DCI) remains unclear. One of the hypotheses suggests that reactive oxygen species play a role in its onset. Thus, we studied F2-isoprostanes (F2-IsoPs)—oxidative stress biomarkers. Our goal was to improve the early diagnosis of DCI in a non-invasive way. Methods: We conducted a prospective single center analysis of 38 aneurysmal subarachnoid hemorrhage patients. We assessed urine F2-IsoP concentration using immunoenzymatic arrays between the first and fifth day after bleeding. A correlation between urine F2-IsoP concentration and DCI occurrence was examined regarding clinical conditions and outcomes. Results: The urine F2-IsoP concentrations were greater than those in the control groups (p < 0.001). The 3rd day urine F2-IsoPs concentrations were correlated with DCI occurrence (p < 0.001) and long term outcomes after 12 months (p < 0.001). Conclusions: High levels of urine F2-IsoPs on day 3 can herald DCI.

scholarly journals Mitochondrial impairments in aetiopathology of multifactorial diseases: common origin but individual outcomes in context of 3P medicine

2021 ◽  
Vol 12 (1) ◽  
pp. 27-40 ◽  
Author(s):  
Lenka Koklesova ◽  
Marek Samec ◽  
Alena Liskova ◽  
Kevin Zhai ◽  
Dietrich Büsselberg ◽  
...  
Keyword(s):  
Energy Production ◽  
Cost Effective ◽  
Organ Damage ◽  
Targeted Prevention ◽  
Multifactorial Diseases ◽  
Analytical Instruments ◽  
Individual Outcomes ◽  
Current Article ◽  
Analytical Approaches

AbstractMitochondrial injury plays a key role in the aetiopathology of multifactorial diseases exhibiting a “vicious circle” characteristic for pathomechanisms of the mitochondrial and multi-organ damage frequently developed in a reciprocal manner. Although the origin of the damage is common (uncontrolled ROS release, diminished energy production and extensive oxidative stress to life-important biomolecules such as mtDNA and chrDNA), individual outcomes differ significantly representing a spectrum of associated pathologies including but not restricted to neurodegeneration, cardiovascular diseases and cancers. Contextually, the role of predictive, preventive and personalised (PPPM/3P) medicine is to introduce predictive analytical approaches which allow for distinguishing between individual outcomes under circumstance of mitochondrial impairments followed by cost-effective targeted prevention and personalisation of medical services. Current article considers innovative concepts and analytical instruments to advance management of mitochondriopathies and associated pathologies.

scholarly journals Resolution of the Expert Council «The role of type I interferon inhibitor in the treatment of patients with systemic lupus erythematosus»

2021 ◽  
Vol 15 (4) ◽  
pp. 126-128
Author(s):  
A. M. Lila ◽  
S. K. Soloviev ◽  
T. V. Popkova
Keyword(s):  
Systemic Lupus Erythematosus ◽  
Lupus Erythematosus ◽  
Organ Damage ◽  
Immunosuppressive Drugs ◽  
Type I ◽  
Type I Ifn ◽  
Systemic Lupus ◽  
Key Points

On April 28, 2021, a meeting of the Council of Experts was held with the participation of the leading experts in the field of rheumatic diseases, approaches to the treatment of patients with systemic lupus erythematosus (SLE) were discussed. The issues of medical care for patients with SLE and their routing, key points of Russian and international clinical guidelines for the management of patients with SLE, as well as the role of interferon (IFN) type I in the pathogenesis of the disease were discussed. It is noted that the management of patients with SLE requires a multidisciplinary approach. The basis of therapy is the use of glucocorticoids (GC), immunosuppressive drugs and their combinations. But long-term use of GC in patients with SLE leads to severe complications. Early prescription of biological disease-modifying antirheumatic drugs (bDMARDs) allows to achieve the greatest effect and prevent the development of irreversible organ damage associated with SLE. Currently data from three clinical trials on the efficacy and safety of the type I IFN inhibitor anifrolumab are available. During the discussion, experts defined the clinical profile of a patient with SLE, for whom administration of bDMARD therapy is indicated. According to experts, the use of a type I IFN inhibitor in routine clinical practice can improve disease outcomes in both short and long term.

scholarly journals It's not over till it's over: a narrative review of Long COVID

2021 ◽  
Keyword(s):  
Orthostatic Intolerance ◽  
Acute Infection ◽  
Viral Persistence ◽  
Organ Damage ◽  
Long Term Results ◽  
C Reactive Protein ◽  
Reactive Protein ◽  
Relapsing Remitting

Viral persistence following acute COVID infection is increasingly being reported by patients and gradually being recognized as a medical syndrome. Like much about COVID, this so-called Long COVID is perplexing. It is associated with numerous symptoms, foremost among them profound fatigue, and often occurs in a relapsing/remitting pattern. There is one “living” guideline for managing Long COVID and even terminology and definitions of the syndrome are in flux. Long COVID occurs in patients who have recovered from the acute infection and this may be viral persistence, a form of autoimmunity, or the long-term results of organ damage sustained during the acute infection. Symptoms have been reported up to six months after acute infection with no clear association between the severity of the acute infection and the presence or absence of Long COVID. The symptoms of the acute illness do not necessarily align with the symptoms of Long COVID. Disruptions to the autonomic function in Long COVID are particularly puzzling, including orthostatic intolerance syndrome (which may not have occurred during the acute infection). Loss of the sense of smell and taste is one symptom that appears common in both acute and Long COVID; on the other hand, fever is more prevalent in acute than Long COVID. Research is urgently needed to better understand Long COVID, for example: what is the role of elevated biomarkers such as D-dimer and C-reactive protein in Long COVID? Is Long COVID one or more than one syndrome? How can patients with Long COVID be appropriately treated?

scholarly journals A correlation between the fluctuations of cytokine concentrations measured in the morning and evening and the circadian blood pressure rhythm in patients with stage II essential hypertension

2019 ◽  
pp. 65-70 ◽  
Author(s):  
OA Radaeva ◽  
AS Simbirtsev ◽  
AV Khovryakov
Keyword(s):  
Blood Pressure ◽  
Essential Hypertension ◽  
Blood Pressure Monitoring ◽  
Organ Damage ◽  
Time Of Day ◽  
Stage Ii ◽  
Healthy Controls ◽  
Cytokine Levels ◽  
Pathophysiological Role

Today, increasing attention is being paid to the role of circadian rhythms in pathology. There are time-of-day-dependent immune markers that provide valuable information about disease progression. The aim of this study was to measure evening and morning concentrations of a few cytokines (interleukins, adhesion molecules, tumor necrosis/growth factors, etc.) in the peripheral blood of patients with stage II essential hypertension and to investigate how they correlate with a nocturnal blood pressure decline. Blood samples were collected from 90 patients with stage II EH at 7:00 a.m. and 8:00 p.m. Cytokine concentrations were measured using immunoassays. Based on 24-h blood pressure monitoring, the patients were distributed into 3 groups: dippers, non-dippers and night-peakers. The morning to evening ratios of cytokine concentrations in patients with EH differed from those in healthy controls due to an increase in the evening concentrations of somnogenic cytokines (IL1β, IL1α) and LIF, sLIFr, and M-CSF whose daily fluctuations patterns remain understudied. On the whole, the fluctuation patterns of the measured cytokines in patients with stage II EH who had had the condition for 10 to 14 years and were receiving no antihypertensive treatment at the time of our study differed from those displayed by healthy controls. A twenty percent rise in the evening concentrations of IL1α, LIF, sLIFr, M-CSF, and erythropoietin contributes significantly to pathological blood pressure rhythms (as demonstrated by the groups of non-dippers and night-peakers) in patients with stage II EH receiving no antihypertensive therapy. Understanding the pathophysiological role of cytokine levels and their fluctuations over a 24-h cycle could inspire new methods for EH prevention and reduce end-organ damage.

scholarly journals The possible role of molecular mimicry in SARS-CoV-2-mediated autoimmunity: an immunobiochemical basis

2021 ◽  
Vol 90 (3) ◽  
pp. e560
Author(s):  
Dženan Kovačić ◽  
Jovana Jotanović ◽  
Jasmina Laković
Keyword(s):  
Molecular Mimicry ◽  
Causative Factor ◽  
Organ Damage ◽  
Peptide Sequence ◽  
Autoimmune Response ◽  
The Novel ◽  
Autoimmune Conditions ◽  
First Time

Coronavirus Disease 2019 (COVID-19), caused by the novel Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2), persists as a threat to global health and continues to be a rapidly evolving condition. Although COVID19 is negatively correlated with the existing comorbidities in terms of the clinical outcome, the ability of SARS-CoV-2 to mediate the novel, or to exacerbate the existing autoimmune conditions, has generated considerable interest, due to its potential implications both with regard to patients suffering from autoimmune conditions, as well as to the long-term consequences of the disease. However, although molecular mimicry has been postulated as a potential causative factor in post-COVID19 autoimmunity and multi-organ damage, a substantial body of research needs to emerge in order to achieve a more definitive conclusion. We investigated the possibility of SARS-CoV-2 peptide sequences behaving as molecular mimics with a potential to trigger an autoimmune response. Thus, on the basis of analysis in silico, we were able to develop a plausible case for the molecular mimicry as a potential aetiological mechanism of SARS-CoV-2-mediated autoimmunity, both in a multi-organ damage context or outside of the viral phase of infection. Interestingly, this is the first time that the peptide sequence of MACROD1 has been implicated in the COVID-19 autoimmunity. Additionally, we also confirm that PARP9 and PARP14 may be involved in the process.

scholarly journals Causes and consequences of sympathetic overactivity in hypertension

2003 ◽  
Vol 9 (3) ◽  
pp. 81-88 ◽  
Author(s):  
E. V. Shlyakhto ◽  
A. Ο. Conrady
Keyword(s):  
Metabolic Disorders ◽  
Target Organ Damage ◽  
Organ Damage ◽  
Target Organ ◽  
Blood Pressure Elevation ◽  
Sympathetic Overactivity ◽  
Long Term Prognosis ◽  
The Impact

The paper is dedicated to methods to assess sympathetic activity in humans and role of simpathetic nervous system in development and progression of arterial hypertension. The impact of simpathetic overactivity into blood pressure elevation is discussed as consequences of sympathetic overactivity from target organ damage, metabolic disorders and long-term prognosis.

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