Maciej Jankowski - Academia.edu (original) (raw)

Papers by Maciej Jankowski

Acta Biochimica Polonica, 1970

British Journal of Pharmacology, Apr 1, 2005

Journal of physiology and pharmacology : an official journal of the Polish Physiological Society, 2016

Plasma filtration through glomerular filtration barrier (GFB) is a key process to maintain fluid ... more Plasma filtration through glomerular filtration barrier (GFB) is a key process to maintain fluid and electrolyte homeostasis. GFB consisting of endothelial cells, podocytes and basement membrane restricts passage of albumin but is permeable for smaller plasma molecules. Various biological agents, such as extracellular nucleotides influence activity of cells, which in turn affects permeability of GFB. Nucleotides are released from cells outside and within the glomeruli that activate the purinoceptors - P2Rs classified into ATP-gated non-selective ion channels, P2X receptors (P2XRs), and G-protein-coupled metabotropic P2Y receptors (P2YRs). P2Rs are expressed on cellular components of GFB. P2Rs activation triggers intracellular calcium concentration and calcium-dependent metabolism with subsequent affect on glomerular permeability to albumin. Purinergic-dependent glomerular cell activation also affects the biophysical properties of acelluar glomerular basement membrane (GMB). Finally,...

$Research paper thumbnail of The Impact of Lipoprotein Apheresis on Oxidative Stress Biomarkers and High-Density Lipoprotein Subfractions$

Oxidative Medicine and Cellular Longevity, 2020

Lipoprotein apheresis (LA) treatment results in a substantial reduction of low-density lipoprotei... more Lipoprotein apheresis (LA) treatment results in a substantial reduction of low-density lipoprotein- (LDL-) cholesterol and lipoprotein(a) concentrations, which consequently decreases the rate of cardiovascular events. The additional benefit of LA may be associated with its impact on the composition and quality of high-density lipoprotein (HDL) particles, inflammation, and oxidative stress condition. To verify the effects of LA procedure, the current study is aimed at analyzing the effect of a single apheresis procedure with direct hemadsorption (DALI) and cascade filtration (MONET) on oxidative stress markers and HDL-related parameters. The study included eleven patients with familial hypercholesterolemia and hyperlipoproteinemia(a) treated with regular LA (DALI or MONET). We investigated the pre- and postapheresis concentration of the lipid-related oxidative stress markers 8-isoPGF2, oxLDL, TBARS, and PON-1. We also tracked potential changes in the main HDL apolipoproteins (ApoA-I,...

Journal of physiology and pharmacology : an official journal of the Polish Physiological Society, 2003

Effects of Ap4A and NAD--precursor of adenosine, on renal plasma flow (RPF), glomerular filtratio... more Effects of Ap4A and NAD--precursor of adenosine, on renal plasma flow (RPF), glomerular filtration rate (GFR) and urine excretion were determined in the anaesthetised rats. Infusion of Ap4A or NAD (i.v., bolus--1 micromol/kg followed by 10 nmol/min/kg) decreased RPF and GFR (by 30 and 40%, respectively). In spite of GFR reduction during Ap4A infusion, the significant increase in sodium excretion and urine flow was noticed: fractional sodium (FENa) and urine excretion (FEurine) rose 15-fold and 2.5-fold in comparison with the control value, respectively. In contrast to Ap4A, NAD-induced decrease in GFR was associated with parallel decrease in sodium and urine excretion, thus the FENa and FEurine did not significantly change. Pretreatment with adenosine deaminase (adenosine degrading enzyme, 2 U/min/kg) or theophylline (P1-receptors antagonist, 0.2 mmol/min/kg) ceased responses to NAD, whereas Ap4A-induced changes were not affected. Pre-treatment with suramin (P2-receptors antagonist,...

International Journal of Molecular Sciences

Urinary extracellular vesicle (uEV) proteins may be used as specific markers of kidney damage in ... more Urinary extracellular vesicle (uEV) proteins may be used as specific markers of kidney damage in various pathophysiological conditions. The nanoparticle-tracking analysis (NTA) appears to be the most useful method for the analysis of uEVs due to its ability to analyze particles below 300 nm. The NTA method has been used to measure the size and concentration of uEVs and also allows for a deeper analysis of uEVs based on their protein composition using fluorescence measurements. However, despite much interest in the clinical application of uEVs, their analysis using the NTA method is poorly described and requires meticulous sample preparation, experimental adjustment of instrument settings, and above all, an understanding of the limitations of the method. In the present work, we demonstrate the usefulness of an NTA. We also present problems encountered during analysis with possible solutions: the choice of sample dilution, the method of the presentation and comparison of results, phot...

Journal of physiology and pharmacology : an official journal of the Polish Physiological Society, 2005

Cyclic AMP has been generally recognised as activator of cAMP-dependent protein kinases. However,... more Cyclic AMP has been generally recognised as activator of cAMP-dependent protein kinases. However, there is little evidence about role of cAMP-dependent protein kinase (PKA), in particular izoenzymes PKA-I and PKA-II, in glomeruli contractility. We measured changes of glomerular inulin space (GIS) as a marker of its contractility in the presence of phosphodiesterase resistance cAMP analogues; activators and inhibitors of PKA. Activator of PKA i.e. (Sp) 8-Cl-cAMPS (0.1-100 microM) decreased GIS. (Rp) 8-Cl-cAMPS (0.1-100 microM), inhibitor of PKA, was ineffective but shifted concentration-response curve of (Sp) 8-Cl-cAMPS to right at 50 microM. Specific A site activation by N6-benzoyl-cAMP decreased GIS with maximum at 0.1 microM. Activation of B site by 8-aminobutyloamino-cAMP (0.1-100 microM) had no effect. However, specific activation of both sites on PKA-I or PKA-II by site-selective analogue pairs e.g. 8-aminobutyloamino-cAMP plus 8-piperidino-cAMP or N6-benzoyl-cAMP plus 8-piperi...

Translational Pediatrics, 2021

Background: The relationship between intelligence quotient (IQ) and somatic development, especial... more Background: The relationship between intelligence quotient (IQ) and somatic development, especially growth, has been demonstrated in various groups of children. Down syndrome (DS) is characterized by short stature, overweight, and cognitive impairment. The objective of our work was to assess whether anthropometric measurements [weight, height, body mass index (BMI)] of children with DS correlate with their IQ. The results of the study may be valuable for this population in the light of increasing access to growth hormone therapy (GHT) in various genetic syndromes with short stature. Based on previous studies on children, we hypothesized that a link exists between IQ and somatic development, particularly growth. Methods: This cross-sectional study included 40 children with DS, who were aged 9-18 years. The studied population was selected from the registry of the Genetic Clinic at the University Clinical Center in Gdańsk (Poland). Anthropometric measurements (weight and height) were taken for all the children, and their BMI was determined using these data. The obtained results were plotted on charts for children with DS. The IQ of the children was assessed using the Stanford Binet Intelligence Scale, Fifth Edition. The correlations between IQ and anthropometric data were analyzed using univariate correlation and multiple regression analyses.

Nutrients, 2021

Impaired triglyceride-rich lipoprotein plasma catabolism is considered the most important factor ... more Impaired triglyceride-rich lipoprotein plasma catabolism is considered the most important factor for hypertriglyceridemia development. The aim of this study was to evaluate the impact of hypercholesterolemia and hypertriglyceridemia on the efficiency of lipoprotein lipase (LPL)-mediated very-low-density lipoprotein (VLDL)-triglyceride lipolysis and the role of high-density lipoprotein (HDL) in this process. Subjects with no history of cardiovascular disease (CVD) and untreated with lipid-lowering agents were recruited into the study and divided into normolipidemic, hypercholesterolemic, and hyperlipidemic groups. VLDL was isolated from serum and incubated with LPL in the absence or presence of HDL. For the hypercholesterolemic and hyperlipidemic groups, a significantly lower percentage of hydrolyzed VLDL-triglyceride was achieved compared to the normolipidemic group (p < 0.01). HDL enhanced the lipolysis efficiency in the hypercholesterolemic and hyperlipidemic groups on average ...

Life, 2020

Background: The monogenic defect in familial hypercholesterolemia (FH) is detected in ∼40% of cas... more Background: The monogenic defect in familial hypercholesterolemia (FH) is detected in ∼40% of cases. The majority of mutation-negative patients have a polygenic cause of high LDL-cholesterol (LDL-C). We sought to investigate whether the underlying monogenic or polygenic defect is associated with the response to rosuvastatin. Methods: FH Individuals were tested for mutations in LDLR and APOB genes. A previously established LDL-C-specific polygenic risk score (PRS) was used to examine the possibility of polygenic hypercholesterolemia in mutation-negative patients. All of the patients received rosuvastatin and they were followed for 8 ± 2 months. A propensity score analysis was performed to evaluate the variables associated with the response to treatment. Results: Monogenic subjects had higher mean (±SD) baseline LDL-C when compared to polygenic (7.6 ± 1.5 mmol/L vs. 6.2 ± 1.2 mmol/L; p < 0.001). Adjusted model showed a lower percentage of change in LDL-C after rosuvastatin treatmen...

Cardiology Journal, 2013

Background: Oxidative stress and dyslipidemia play a critical role in the development of cardiova... more Background: Oxidative stress and dyslipidemia play a critical role in the development of cardiovascular disease. Regular intake of polyphenol-rich diets is associated with a reduced risk of cardiovascular diseases. Methods: The present study was a pilot study with 24 healthy volunteers and was designed to determine if a 12-week administration of Cistus incanus herbal tea, containing phenolic acids and flavonoids, reduces cardiovascular risk factors including oxidative stress and dyslipidemia in healthy adults. Phenolic compounds profile and antibacterial activity of Cistus incanus infusion were also measured. Results: Herbal infusion led to improvement in lipid profile by increase (4%, p = 0.033) high-density lipoprotein cholesterol concentration and decrease triglyceride (14%, p = 0.013) concentrations. In addition, the Cistus incanus diet was associated with decreased serum concentrations of malondialdehyde (16%, p < 0.01) and advanced oxidation protein products (18%, p < 0.001). Conclusions: Cistus incanus administration decreases cardiovascular risk factors including oxidative stress and dyslipidemia and this action supports the idea of using Cistus incanus tea on a daily basis as an effective dietary component for prevention of atherosclerotic cardiovascular disease.

Pharmacological Reports

Background Vascular endothelial growth factor A (VEGF-A) and P2-receptors (P2Rs) are involved in ... more Background Vascular endothelial growth factor A (VEGF-A) and P2-receptors (P2Rs) are involved in the pathogenesis of diabetic nephropathy. The processing of VEGF-A by matrix metalloproteinases (MMP) regulates its bioavailability. Since the ATP-induced release of MMP-9 is mediated by P2Rs, we investigated the effect of suramin on VEGF-A excretion in urine and the urinary activity of total MMP and MMP-9. Methods The effect of suramin (10 mg/kg, ip) on VEGF-A concentration in serum and its excretion in urine was investigated in streptozotocin (STZ)-induced diabetic rats over a 21-day period. The rats received suramin 7 and 14 days after a single STZ injection (65 mg/kg, ip). A 24-h collection of urine was performed on the day preceding the administration of STZ and the first administration of suramin and on the day before the end of the experiment. The VEGF-A in serum and urine, albumin in urine, and total activity of MMP and MMP-9 in urine were measured using immunoassays. Results Dia...

Journal of Clinical Medicine

The improvement in the lifespan of individuals with Down syndrome (DS) has created interest in th... more The improvement in the lifespan of individuals with Down syndrome (DS) has created interest in the context of the development of age-related diseases. Among them is atherosclerosis-based cardiovascular disease (CVD), which seems to be an especially urgent and important issue. The aim of the present study was to evaluate the lipid markers that may clarify cardiovascular risk profiles in individuals with DS. To this end, we analyzed lipid profile parameters, including lipoprotein(a) (Lp(a)) levels, protein composition, and the antioxidative properties of high-density lipoprotein (HDL), in 47 adolescents with DS and 47 individuals without DS. Compared with the control group (C), subjects with DS had significantly increased concentrations of low-density lipoprotein cholesterol (105 ± 31 vs. 90 ± 24 mg/dL, p = 0.014), non-high-density lipoprotein cholesterol (120 ± 32 vs. 103 ± 26 mg/dL, p = 0.006), and triglycerides (72 [55–97] vs. 60 [50–77] mg/dL, p = 0.048). We found that patients wi...

Nutrients

Introduction: The risk of obesity in children with Down syndrome is high. Undoubtedly, proper nut... more Introduction: The risk of obesity in children with Down syndrome is high. Undoubtedly, proper nutrition plays an important role in the prevention of excess body weight and is associated with a reduction of metabolic complications. The aim of the study was to assess the problem of disturbances in the nutritional status and eating habits of children with DS. Methods: A total of 39 patients were included in the study. The nutritional status was assessed by anthropometric tests and Dual X-ray Absorptiometry. Eating habits were assessed using the Child Eating Behavior Questionnaire and the Food Frequency Questionnaire. Blood samples were taken to determine the oxidative stress and lipid parameters. Results: Obesity was recognized in 15% of subjects and 23% were overweight. Children that were overweight were characterized by higher levels of triglycerides, atherogenic index of plasma, and apoA2 and apoE levels. Fat mass, fat mass/height2 index, and visceral fat mass correlated with thioba...

Journal of mother and child, 2021

Down syndrome (DS) is the most common chromosomal aberration and genetically determined cause of ... more Down syndrome (DS) is the most common chromosomal aberration and genetically determined cause of intellectual disability. DS patients often present with some congenital defects and chronic diseases, including early onset dementia, which affects 70% of DS patients over 55 years of age and has a clinical presentation similar to Alzheimer disease (AD). The symptoms of DS originate from excessive genetic material within the "critical region" of the 21st chromosome. The "critical region" encompasses genes potentially associated with increase risk of dementia, e.g. the APP gene (amyloid beta precursor protein) which leads to excessive amyloid beta production. Post-mortem studies of DS patients' brains revealed diffuse deposition of the insoluble form of amyloid beta (Aβ), which is a characteristic feature of AD. Moreover, those changes were commonly observed in subjects > 31 years old. The pathomechanisms of AD have not been fully elucidated and scientists are s...

Physiological Reports, 2021

This is an open access article under the terms of the Creative Commons Attribution License, which... more This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Azathioprine (AZA) – immunosuppressive prodrug is characterized by a high interindividual variabi... more Azathioprine (AZA) – immunosuppressive prodrug is characterized by a high interindividual variability in bioavailability and metabolism. It is used in a broad spectrum of dermatological dysimmune diseases, either as the primary drug or as adjunctive treatment. AZA undergoes non-enzymatic conversion in the liver yielding 6-mercaptopurine which afterwards is converted into cytotoxic 6-thioguanine nucleoside. It exerts immunosuppressive activity by inhibiting DNA replication during immune response. Moreover, it may also decrease proliferation of bone marrow cells which may lead to myelosuppression. Thus, the therapeutic role of AZA is often discussed because of toxicity. The study aims to characterize the toxicity profile of AZA. This study is based on retrospective examination of data taken from the hospital notes of these patients who had been treated with AZA due to dermatological dysimmune diseases. Of 294 patients evaluated, 151 were treated with AZA at a dose 50-200 mg/day. Adver...

Oxidative stress due to free radicals is involved in the pathogenesis of many chronic disorders i... more Oxidative stress due to free radicals is involved in the pathogenesis of many chronic disorders including cancer, inflammation and neurological diseases. Reactive oxygen species (ROS) may be implicated in age-related macular degeneration (AMD).This study investigated the expression of manganese superoxide dismutase MnSOD on mRNA and protein level. Moreover it examines the genetic sequence polymorphism. Our intend is to find a correlation between the expression of studied genes and nucleotide sequence polymorphisms encoded in the gene of two different types of age-related macular degeneration. Methods: MnSOD gene polymorphisms were determined by PCR/RFLP method. Real time PCR and ELISA methods were used to analyze gene expression on mRNA and protein level. Results: There are statistically significant differences in genotype distribution between patients with AMD and controls. Results showed positive correlation between MnSOD expression on mRNA and protein level and gene sequence poly...

Biomedicine & Pharmacotherapy, 2021

Diabetes mellitus causes changes in metabolism of extracellular nucleotides acting through P2 rec... more Diabetes mellitus causes changes in metabolism of extracellular nucleotides acting through P2 receptors (P2Rs). This affects renal function and may lead to glomerular and tubular disturbances. We measured urinary excretion of nucleotides (ATP, ADP, AMP, UTP, UDP, UMP) in streptozotocin-induced diabetic rats (65 mg/kg, i.p., day 0) and the effects of P2Rs' blockade by suramin (10 mg/kg, i.p., days +7, +14) on glomerular P2×7R expression and urinary excretion of glomerular (albumin, nephrin) and tubular (KIM-1, NGAL) injury markers, electrolytes, and oxidative stress markers (TBARS, 8-OHdG). Concentrations of nucleotides, specific proteins, electrolytes, and oxidative stress markers in 24-h urine samples collected in metabolic cages at days-1, +6 and +20 were measured using ion-paired reversed-phase HPLC, immunoenzymatic and fluorometric methods, and flame photometry, respectively. Expression of KIM-1 and P2×7R was examined by immunohistochemistry or immunoblotting. Diabetes was associated with increased urinary excretion of ATP, ADP, UTP, UDP and glomerular P2×7R expression. Suramin attenuated P2×7R expression but did not affect urinary excretion of nucleotides. Urinary excretion of albumin, nephrin, NGAL, and 8-OHdG were increased in diabetic rats and were not affected by suramin. TBARS was higher in diabetic rats and suramin attenuated the excretion dynamics in this group. KIM-1 excretion was higher in diabetic rats and suramin further increased excretion of KIM-1 in both diabetic and non-diabetic rats. Furthermore, suramin attenuated the diabetes-induced natriuresis and kaliuresis. It is possible that suramin affects both glomerular and tubular functions in diabetic rats.

Biochemia medica, 2020

Introduction: Urine particle analysis is an important diagnostic tool. The aim of this study was ... more Introduction: Urine particle analysis is an important diagnostic tool. The aim of this study was to evaluate the quality of urine leukocyte (WBC) and erythrocyte (RBC) counting results obtained with manual and automated methods in Polish laboratories participating in the international external quality assessment (EQA) programme. Materials and methods: 1400 WBC and RBC counting results were obtained from 183 laboratories in EQA surveys organised by Labquality (Helsinki, Finland) from 2017 to 2019. The between-laboratory coefficient of variation (CV), the percentage difference between the laboratories' results and target values (Q-score (%)), as well as modified Youden plots were analysed. Results: For automated method groups, the medians of inter-laboratory CVs varied from 14% to 33% for WBC counting and from 10% to 39% for RBC counting. For manual method groups, the medians of CV varied from 53% to 71% (WBC) and from 55% to 70% (RBC), and they were significantly higher, in compa...