Rownicka-Zubik J.,University of Silesia |
Sulkowski L.,Regional Specialistic Hospital |
Toborek M.,University of Miami
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014
Following absorption, polychlorinated biphenyls (PCBs) bind to albumin and are transported via blood into the target tissues. PCBs then accumulate in tissues and induce a variety of harmful chronic and developmental effects. The aim of the present study is to determine binding parameters, such as binding constant, quenching constant, and number of binding sites for three PCB congeners (PCB118, PCB126 and PCB153) in complex with human serum albumin (HSA). The binding parameters for the complexes of HSA-PCB118, HSA-PCB126, and HSA-PCB153 excited at 280 nm were compared with those excited at 295 nm. Quenching (static and dynamic) of HSA fluorescence was analyzed based on the Stern-Volmer method. Binding (Ka) constants were calculated according to the Scatchard method and analysis of non-linear regression was based on a two-component model with the Lavenberg-Marquardt algorithm. For all analyzed complexes, a single independent class of binding site for PCB congeners was found in HSA subdomain IIA. Tyrosine residues appear to play the most prominent role in binding of PCB126 to HSA, while tryptophan-214 played a dominant role in interactions of PCB153 with HSA. Among studied PCB congeners, PCB118 formed the most stable complexes with HSA. These results illustrate the importance of studies targeting the binding of PCBs to serum albumin as part of the strategy to understand and protect against toxicity of these environmental toxicants. © 2014 Published by Elsevier B.V.
Bladowska J.,Wroclaw Medical University |
Zimny A.,Wroclaw Medical University |
Knysz B.,Wroclaw Medical University |
Malyszczak K.,Wroclaw Medical University |
And 5 more authors.
Journal of Hepatology | Year: 2013
Background & Aims The aim of the study was to evaluate early metabolic perfusion, and microstructural cerebral changes in patients with the hepatitis C virus (HCV) infection and normal appearing brain on plain MR using advanced MR techniques, as well as to assess correlations of MR measurements with the liver histology activity index (HAI). Methods Fifteen HCV-positive patients and 18 control subjects underwent single voxel MR spectroscopy (MRS), perfusion weighted imaging (PWI), and diffusion tensor imaging (DTI), using a 1.5T MR unit. MRS metabolite ratios (NAA/Cr, Cho/Cr, mI/Cr) were calculated. PWI values of relative cerebral blood volume (rCBV) were assessed from 8 areas including several cortical locations, basal ganglia, and fronto-parietal white matter. DTI fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values were obtained from 14 white matter tracts. Results Compared to controls, HCV-positive patients showed significantly (p <0.05) lower NAA/Cr ratios within frontal and parietal white matters, lower rCBV values within frontal and temporo-parietal cortices, decreased FA values, as well as increased ADC values in several white matter tracts. We also found elevated rCBV values in basal ganglia regions. The increase in mI/Cr and Cho/Cr ratio was correlated with a higher HAI score. Conclusions The results of advanced MR techniques indicate neurotoxicity of HCV reflected by neuronal impairment within white matter, cortical hypoperfusion, and disintegrity within several white matter tracts. Hyperperfusion in basal ganglia may be an indicator of brain inflammation in HCV patients. Our findings may suggest a biologic link between HCV-related liver disease and cerebral dysfunction.
Rownicka-Zubik J.,Medical University of Silesia, Katowice |
Sulkowski L.,Regional Specialistic Hospital |
Maciazek-Jurczyk M.,Medical University of Silesia, Katowice |
Sulkowska A.,Medical University of Silesia, Katowice
Journal of Molecular Structure | Year: 2013
The binding of piroxicam (PIR) to human (HSA), bovine (BSA) and sheep (SSA) serum albumin in native and destabilized/denaturated state was studied by the fluorescence quenching technique. Quenching of the intrinsic fluorescence of three analyzed serum albumins was observed due to selective exciting of tryptophanyl and tyrosil residues at 295 nm and 280 nm. Based on fluorescence emission spectra the quenching (KQ) and binding constants (K a) were determined. The results showed that PIR is bound mainly in IIA subdomain of HSA and is additionally able to interact with tyrosil groups located in subdomains IB, IIB or IIIA. PIR interacts only with tryptophanyl residues of BSA and SSA [Trp-214, Trp-237 (IIA) and Trp-135, Trp-158 (IB)]. The presence of denaturating factors modified the mechanism of fluorescence quenching of SSA by PIR. Linear Scatchard plots suggest that HSA, BSA and SSA bind PIR in one class of binding sites. © 2012 Elsevier B.V. All rights reserved.
Zyluk A.,Pomeranian Medical University |
Ostrowski P.,Regional Specialistic Hospital
Polski Przeglad Chirurgiczny/ Polish Journal of Surgery | Year: 2011
The aim of the study was to "refresh" the knowledge about the course of acute appendicitis, to confront the classical clinical picture with the practice, analyze its fluctuations and identify factors influencing these. Material and methods. All patients admitted to the Department of General Surgery in Grudzia̧dz District Hospital with the suspicion of acute appendicitis, who underwent appendectomy and in whom the appendicitis was confirmed in pathologic examination were included in the study. There were 85 patients, 49 men (58%) and 36 women (42%) in a mean age of 30 years (range 10-75). Symptoms, signs and results of biochemical tests (leukocyte rate and CRP) were considered in the analysis. Results. The commonest constellation of symptoms and signs, occurring in at least of 3/4 patients consisted of pain and tenderness localized in right lower quadrant (100%), which exacerbates at movements (98%), felling unwell (93%), loss of appetite (88%), and rebound tenderness in right lower quadrant (74%). Conclusions. No particular fluctuation of clinical features in relation to gender, age, duration of symptoms, biochemical parameters and morphological severity of the inflammation was observed. Relevant findings included relatively fast development (<12 hrs) of advanced appendicitis in 18% of adult patients and more than a half patients with normal body temperature, regardless true appendicitis.
Rudowski M.,Wroclaw University |
Orzechowski K.,Wroclaw University |
Rzaca M.,Regional Specialistic Hospital
Journal of Non-Crystalline Solids | Year: 2010
A new technique for intra-operative breast cancer tissue recognition is proposed. Using the open-ended probe covered by Mylar® film we investigated dielectric properties of breast tissue samples coming from 131 patients. The high efficiency in differentiation between normal and anomalous tissue and the ability to fulfil aseptic conditions is promising in cancer diagnostics. Presence of blood and electrolytes does not disturb measurements. A prototype of intra-operative cancer probe was designed and tested. © 2010.