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Biomedical subjects

K Olczyk

Publications and source records attributed to K Olczyk.

At least 19 recordsLinked to original sources
PubMed2001

Dermatan sulfates of normal and scarred fascia.

We evaluated the composition of dermatan sulfates (DS) derived from 23 samples of normal and 23 samples of scarred fascia lata. We analyzed the molecular weight of intact DS chains and the length of chain regions comprising: (1) clusters of L-iduronate-containing disaccharides ("iduronic sections"); (2) clusters of D-glucuronate-containing disaccharides ("glucuronic sections"); and (3) copolymeric sections with both types of disaccharides. A portion of scarred fascia DS chains demonstrated higher molecular weight compared with those from normal tissue. Most disaccharides of DS chains derived from both fascia types form copolymeric segments - heterogeneous in size - with alternatively distributed single disaccharides with glucuronic residues and mainly single ones with iduronate. Only a small number of disaccharides form "glucuronic sections" of heterogeneous size or short "iduronic sections". However, the scarred fascia DS chains demonstrate an increased content of shorter "glucuronic sections" and shorter, often oversulfated, copolymeric segments. It seems that in normal fascia, the DS chain type with a single, long copolymeric region and a single, shorter "glucuronic section" is predominant, while in scarred tissue an increase in multidomain DS chain content may occur.

Adult↗
PubMed2001

Serum matrix-degrading enzymes in rats intoxicated with selenium.

The effect of poisoning doses of selenium on serum matrix-degrading enzymes activity was investigated in rats intoxicated with selenium. Fifteen animals were receiving orally sodium selenite in a daily dose of 300 microg/kg body weight. Intoxication with selenium was carried out for 10 weeks. The present study revealed significant increase in activities of enzymes involved in the connective tissue matrix metabolism i.e. beta-glucuronidase, N-acetyl-beta-glucosaminidase, elastase and collagen peptidase. There was no change in the cathepsin activity. The relative enzyme activities calculated over protein level resulted in higher values than those found in direct measurements. Serum enzyme activity was increased most for elastase (about 31%) and N-acetyl-beta-glucosaminidase (about 33%) based on activity per gram of protein. The current data indicate that lysosomes are target organelles for selenium toxicity. Generalized increase in lysosomal enzymes activity contributes to the altered metabolism of the connective tissue in selenium-intoxicated animals. The mechanisms that lead to the increase of lysosomal enzymes activity in rats receiving poisoning doses of selenium could be related to biochemical disturbances caused by selenium toxicity.

Animals↗
PubMed2000

Free radical activity and antioxidant defense mechanisms in patients with hyperthyroidism due to Graves' disease during therapy.

Free radical-mediated oxidative stress has been implicated in the etiopathogenesis of several autoimmune disorders. We investigated the prooxidant-antioxidant status in order to evaluate the possible deleterious role of oxidative phenomena in patients with Graves' disease. Thirty patients with hyperthyroidism due to Graves' disease were investigated. Thirty age-matched healthy subjects were studied as a control group. Free radical activity indices, antioxidant defense systems, and thyroid and pituitary hormone levels were measured in fasting blood samples. Blood samples were taken before initiation of therapy and after attainment of euthyroid state. A significant increase in lipid peroxidation activity indices, i.e., conjugated dienes and thiobarbituric acid-reacting substances, was found in blood serum of the patients with untreated Graves' disease. These changes were accompanied by a decrease in plasma thiol and erythrocyte lysate thiol groups concentrations. Hyperthyroidism resulted in a marked increase in intracellular antioxidant enzymes, i.e., superoxide dismutase, catalase and glutathione peroxidase activities as compared to the controls. Extracellular anti-free radical scavenging systems potential, measured by glutathione reductase activity and total antioxidant status level, was found to be significantly decreased in untreated Graves' patients. Treatment with thiamazole resulted in normalization of the free radical and antioxidant activity indices. The obtained results indicate an enhanced generation of reactive oxygen species and impairment of cellular and extracellular antioxidant systems potential in patients with Graves' disease. The attainment of euthyroid state led to an improvement in oxidative stress indices and antioxidant potential parameters.

Adult↗
PubMed2000

An accumulation of proteoglycans in scarred fascia.

A little is known about proteoglycan (PG) changes, occuring in the course of scarring of tissues another than skin. The aim of present study was biochemical characterization of glycosaminoglycans (GAGs) and proteoglycans (PGs) of normal and scarred fascia. Samples of normal fascia lata were taken at autopsy from 23 individuals and samples of scarred fascia lata were removed from 23 patients at reoperations for femoral fracture. The obtained tissues were divided into two samples: first of them was submitted to GAG isolation and the second one to PG isolation. GAGs were extracted by extensive papain digestion followed by the fractionation using cetylpyridinium chloride. In order to qualitative and quantitative characterization GAGs were submitted to electrophoresis on cellulose acetate before and after treatment with enzymes, specifically depolymerizing some kinds of GAGs. PGs were extracted using 4 M guanidine HCl followed by purification by forming complexes with Alcian blue. PGs were submitted to gel permeation chromatography on Sepharose 4B. In order to obtain core proteins PGs were depolymerized with chondroitinase ABC. The purified PGs and their core proteins were separated with sodium dodecyl sulphate/polyacrylamide gel electrophoresis (SDS/PAGE). It was found that total GAGs content was significantly elevated in scarred fascia. Both types of fascia contained chondroitin-, dermatan- and heparan sulphates and hyaluronic acid. Dermatan sulphates (DS) were the predominant GAGs of normal and scarred fascia. The contents of all GAG types were increased in scarred fascia. Both types of fascia contained two kinds of dermatan sulphate proteoglycans (DSPGs); first being similar to biglycan and the second one similar to decorin, as it was judged by molecular weight of their native molecules and core proteins as well as type of GAG components. Densitometric analysis showed that decorin is a predominant DSPG in both fascia types, but in scarred tissue the ratio of biglycan to decorin is considerably higher. Moreover, in scarred fascia a large chondroitin sulphate proteoglycan (CSPG) was also observed. The obtained results have shown that the scar formation is accompanied by quantitative and qualitative alterations in GAGs/PGs resembling those observed in hypertrophic skin scars. The biochemical modification of the scarred fascia lata may partly explain the clinically manifested damage to biomechanical properties of this tissue.

Adult↗
PubMed2000

[Free radical concepts in the etiopathogenesis of Graves-Basedow disease].

Increased metabolism due to hyperthyroidism leads to the dysfunction of the mitochondria respiratory chain, resulting in elevated formation of the reactive oxygen species in the course of Graves-Basedow disease. It has also been reported that excessive thyroid hormone level may induce oxidative tissue injury. Furthermore, Graves-Basedow disease is frequently associated with changes of the antioxidant defence system activity. The disturbed balance between oxidative and antioxidative processes may be of significant importance in the pathogenesis of Graves-Basedow disease.

Antioxidants↗
PubMed1998

[Wound repair].

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Adult↗
PubMed1997

[The role of free radicals in the etiopathogenesis of systemic sclerosis].

This article reviews the current concept in the ethiology and pathogenesis of systemic sclerosis. It is suggested that free radicals play a crucial role in pathomechanisms of scleroderma. In addition, the influence of some environmental agents (silica, bleomycin, alcohol, toxic oil) on free radical production and subsequent induction of scleroderma or scleroderma-like syndrome is also described.

Antioxidants↗
PubMed1996

Glycosaminoglycans of human serum and their alterations in diabetes mellitus.

Human serum contains several glycosaminoglycans (GAGs), mainly chondroitin sulphates and significantly less of heparan sulphate + heparin and dermatan sulphate. The non-insulin-dependent diabetes mellitus (with vascular complications) was associated with a significant increase in total serum GAG concentration, mainly of chondroitin sulphates and dermatan sulphate, with a simultaneous decrease in heparan sulphate + heparin level. These alterations were much more evident in patients with poor metabolic control. Hyaluronic acid (undetectable in healthy subjects and in patients with good metabolic control) appeared only in trace amounts in poorly controlled diabetic individuals. The obtained data allow to conclude that the diabetes mellitus-associated disturbances in tissue GAG metabolism lead to significant alterations in serum GAG composition.

Aged↗
PubMed1996

[Free oxygen radicals and their role in the etiopathogenesis of cardiovascular diseases].

The role of the oxygen free radicals in etiopathogenesis of cardiovascular system diseases is described. The participation of free radicals in the heart muscle injury in the course of ischemia and reperfusion is also shown. In addition, the significance of antioxidant vitamins and substances in prevention and treatment of cardiovascular system diseases is presented.

Animals↗
PubMed1994

The lipid peroxidation products and the enzymes of antioxidant system in patients with diabetes mellitus.

The lipid peroxidation product level (conjugated dienes, malonyldialdehyde) as well as superoxide dismutase and glutathione peroxidase activity in diabetic patients were studied. It was found that diabetes mellitus is accompanied by an increase in serum conjugated diene and malonyldialdehyde level as well as by an increased malonyldialdehyde concentration in red blood cells. No changes in erythrocyte superoxide and glutathione peroxidase activity in diabetic patients were found. There were also no differences between diabetic patients with poor and good metabolic control in any of the examined parameters.

Adult↗
PubMed1994

Influence of chronic mercury poisoning upon the connective tissue in rats. I. Effect of mercuric chloride on glycosaminoglycan levels in tissues, serum and urine.

Rats were intoxicated with mercuric chloride (1mg/kg b.w.) daily, for 12 weeks. A decrease in total glycosaminoglycan content was shown in the skin, the lungs, the liver and the heart muscle. These changes were accompanied by a slight alteration of the glycosaminoglycan pattern, a decrease in hyaluronic acid in the skin, the lungs and the heart muscle and an enhancement of heparan sulphate level in the kidneys. In serum of mercury-intoxicated rats, an increase in total glycosaminoglycan levels was shown. This enhancement was caused by elevation of almost all fractions. Urine output of glycosaminoglycans was higher in mercury-treated animals as compared to the controls.

Animals↗
PubMed1994

Influence of chronic mercury poisoning upon the connective tissue in rats. II. Effect of mercuric chloride on collagen and elastin.

Rats were intoxicated with mercuric chloride (1 mg/kg b.w.) daily, for 12 weeks. An increase of total collagen and elastin content was found in the skin, the lungs, the liver, the kidneys and the heart muscle. The increase resulted from the elevated level of soluble collagen. These changes were accompanied by elevated hydroxyproline level in serum and urine. It is concluded that chronic intoxication with mercury leads to disturbed composition of the connective tissue matrix.

Animals↗