[Molecular mechanisms of genetic damages of the myocardium in cardiomyopathy].

The review highlighted problems of reorganization of myocardical contractile and cytoskeletal proteins in cardiomyopathy (CM). The role of the genetic factors coding contractile proteins, proteins of thin and thick filaments, and also extracellular matrix proteins in processes of formation and development of hypertrophic (HCM) and dilated (DCM) cardiomyopathy are analyzed. The mechanisms responsible for the changes in cardiac proteins on regulation involved into force generation, its transfer, recycling ATP, impairments in transmembranal signals, that finally lead to cardiac cell dysfunction determining various manifestations of CM are considered.

[The role of changes of matrix metalloproteinase in cardiovascular diseases].

The review summarizes information about changes of extracellular matrix (ECM) in cardiovascular diseases. Special attention is paid to different groups of extra cellular matrix proteins (collagen I and III type, fibronectine) in the development of cardiac fibrosis in chronic heart failure. The role of matrix metalloproteinases in degradation of components of ECM is analyzed. Interrelationship between matrix metalloproteinases and their tissue inhibitors in fibrosis and cardiac structural chances is analyzed.

[Biochemical and immunological markers of insufficiency of blood circulation at children with cardiomiopathies].

Complex clinical-laboratory investigation of children with congestive heart failure (CHF) developed on the basis of dilated cardiomyopathy and hypertrophic cardiomyopathy has been carried out. The development of CHF in children with cardiomyopathy was accompanied by changes of blood serum lactate, MB isoform of creatine phosphokinase, TNF-6, interleukin-6 (IL-6) (but not IL-2), and soluble receptors for IL-2 and IL-6.

[Cellular mechanisms of calcium regulation of cardiac rhythm in children with ectopic arrhythmias]. / Kletochnye mekhanizmy kal'tsievoi reguliatsii serdechnogo ritma u detei s éktopicheskimi aritmiiami.

Regulation of intracellular calcium homeostasis by means of secondary mediators calmodulin and 4,5-inositol phosphates (products of phosphatidyl inositol hydrolysis) was studied in children with ectopic forms of arrhythmias. Alterations in the system calmodulin-Ca2+ and the activity of phosphoinosite metabolism correlated highly with clinical manifestations of the arrhythmias. The data obtained suggest that a number of molecular mechanisms and responsible for arrhythmias were realized in cell membranes and depended on a complex of intracellular messengers affected within various steps of the hormonal signal transmission.

[Disorders of membrane mechanisms for regulating calcium homeostasis in cardiac arrhythmias in children]. / Narushennia membrannykh mekhanizmov reguliatsii kal'tsievogo gomeostaza pri aritmiiakh serdtsa u detei.

Importance of calmodulin and Ca2+ in membranes of erythrocytes and myocardium was studied in children with ectopic forms of cardiac arrhythmia--extrasystole, paroxysmal and nonparoxysmal tachycardia. Activation of lipid peroxidation and shifts in cytomembrane phospholipid spectrum were shown to be involved in impairments of calcium homeostasis regulation, which is responsible for control of electromechanical parameters and may be related to deterioration of myocardial electrophysiological properties.

[Disorders of membrane mechanisms in stressor damage to the heart in rats of various strains]. / Narusheniia membrannykh mekhanizmov pri stressornykh povrezhdeniiakh serdtsa u krys razlichnykh linii.

The resistance of the rat's organism to emotional stress is determined by alterations of the heart's electric stability. The condition of lipid oxidation is accompanied by alterations of cholesterol and ionised calcium concentrations. Such alterations were expressed in Fisher rats to a greater extent. It conformed to the morphophysiological peculiarities of this group of animals and confirmed its considerable species sensibility.

[The intracellular second messenger system and its regulatory effects in children with a bronchial asthma attack complicated by heart failure]. / Sistema vtorichnykh vnutrikletochnykh posrednikov i ee reguliarognye éffekty u detei v pristupnom periode bronkhial'noi astmy, oslozhnennoi serdechnoi nedostatochnost'iu.

Components of the intracellular mediators system: calmodulin in leukocytes, Ca2+ and cyclic nucleotides in leukocytes and blood plasma were studied in children with attack of bronchial asthma and heart failure. Alterations in content of these biologically active substances correlated with clinical manifestations of bronchial asthma: severity of the disease, duration of the attack, contractile activity of myocardium. Calmodulin, Ca2+ and cyclic nucleotides were demonstrated to be involved in development of the asthmatic attack. Alterations in the system calmodulin-Ca2+ were related to adaptation and contributed to realization of regulating effects responsible for a decrease of impairments in tissues.

[Interrelation of changes in the levels of calcium, calmodulin and cyclic nucleotides in children with ectopic types of arrhythmia]. / Vzaimosviaz' izmenenii soderzhaniia kal'tsiia, kal'modulina i tsiklicheskikh nukleotidov pri ektopicheskikh vidakh aritmii u detei.

In 61 children with different patterns of ectopic arrhythmias (premature heart beat, paroxysmal and non-paroxysmal tachycardia), the peripheral blood leukocytes and myocardial tissues were examined for the content of calmodulin (CM), ionized calcium (Ca2+) and cyclic nucleotides (CN). The data obtained indicate that the CM-Ca2+ and CN system are involved in the genesis of arrhythmias in children and may be used as additional criteria in the diagnosis of cardiac rhythm abnormalities.

[Clinical significance of cyclic nucleotide metabolism and calcium level in children with arrhythmia]. / Klinicheskoe znachenie osobennostei obmena tsiklicheskikh nukleotidov i soderzhaniia ka'ltsiia pri aritmiiakh serdtsa u detei.

The cyclic nucleotides (CN) system and Ca2+ content were examined in children with various heart rhythm disorders (HRD). Marked changes were demonstrated which correlated to clinical manifestations of the arrhythmias: their type, phase, duration and favorable changes in their course. Antiarrhythmic therapy was associated with a normalization of the altered levels of cyclase components and Ca2+. The results suggest that intracellular metabolism regulation may be disrupted in HRD cases and play an important role in the development of arrhythmias.

[Cyclic nucleotides and creatine phosphokinase activity in children with cardiac arrhythmias]. / Tsiklicheskie nukleotidy i aktivnost' kreatinfosfokinazy u detei s narusheniiami ritma serdtsa.

Forty-one children with cardiac arrhythmias were examined. It was established that cardiac rhythm disorders in children were accompanied by an increase in the cGMP levels as well as a decrease in the cAMP content, CPK activity and the cAMP/cGMP ratio varying in relation to the form of arrhythmia and the nature of heart damage.