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Iskalni niz: "avtor" (Aleš Jerin) .

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1.
The role of cytokines and chemokines as biomarkers of disease activity in idiopathic nephrotic syndrome in children
Matjaž Kopač, Aleš Jerin, Agnese Petrera, Joško Osredkar, 2025, izvirni znanstveni članek

Povzetek: This study investigates the association of plasma concentrations of various cytokines and chemokines with the disease activity of idiopathic nephrotic syndrome (INS) in children in Slovenia. (2) In a prospective single-center study lasting 18 months, we took sequential plasma samples from children with INS at disease onset or relapse (prior to corticosteroid (CS) therapy), at remission, and after discontinuation of CS therapy. The Olink®Target 48 Cytokine Panel was applied to analyze 45 analytes in the plasma samples, adhering to the manufacturer’s protocol. We performed a statistical analysis with a paired samples analysis with a t-test as well as with a non-parametric Wilcoxon correction test. (3) We included 18 pediatric patients with INS in the study. We demonstrated statistically significant differences in the concentrations of CSF1, IL4, FLT3LG, CCL19, and MMP12 in the patients at disease onset or relapse compared to those in remission, differences in the concentrations of CSF1 and IL17F in the patients at disease onset or relapse compared to those in remission after CS treatment, and differences in the concentrations of CCL19, MMP12, and CCL13 in the patients in remission compared to those in remission after CS treatment. (4) The findings support potential roles of certain cytokines and chemokines, especially CSF1, CCL19, and MMP12, in influencing the disease activity of INS.
Ključne besede: cytokines, chemokines, idiopathic nephrotic syndrome, children
Objavljeno v DiRROS: 12.02.2026; Ogledov: 69; Prenosov: 26
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2.
Short-term and long-term stability of antioxidant species in plasma samples
Aleš Jerin, Maja Badovinac, Matevž Harlander, Joško Osredkar, 2025, izvirni znanstveni članek

Povzetek: Introduction: Reactive oxygen species and other oxidants can target various biological macromolecules and the organism responds with internal antioxidant systems. The antioxidant capacity in biological systems can be measured by tests like Plasma Antioxidant Test (PAT test), which evaluates the entire antioxidant capacity rather than just one analyte and is not affected by antioxidant enzymatic activity. Stability of antioxidant species in biological samples is crucial data for reliable measurements since preanalytical degradation of the analyte can affect results significantly. We examined short-term stability of antioxidant species in plasma under different temperature conditions and long-term stability of the analyte in frozen plasma samples. Methods: Antioxidant species in plasma measured using PAT test, which is designed to assess the antioxidant capacity of plasma by measuring the total iron-reducing capacity in a sample. Results and Conclusions: Storage of plasma samples for up to 30 hours at 2-8 °C or even at room temperature did not cause substantial bias to the measurement. The influence on results did not exceed the repeatability of the method. Long-term storage of plasma samples up to 12 months at –30 °C did not have a significant impact on results even if the samples were thawed and frozen again.
Ključne besede: oxidative stress, antioxidant capacity, PAT test, sample stability
Objavljeno v DiRROS: 10.02.2026; Ogledov: 56; Prenosov: 26
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3.
L-FABP as a potential biomolecular marker of liver graft injury
Ana Kalamutova, Danaja Plevel, Mihajlo Djokić, Aleš Jerin, Blaž Trotovšek, Miha Petrič, 2025, izvirni znanstveni članek

Povzetek: Background: In recent years, indications for liver transplantation have expanded, while the age of transplant recipients has significantly increased due to improvements in perioperative management. As clinical manifestations of posttransplant complications vary and are often nonspecific, the identification of appropriate biomarkers is important for the assessment of graft quality and early recognition of potential complications following liver transplantation. Liver-type FABP (L-FABP) is a small cytoplasmic protein found abundantly in hepatocytes and is involved in the intracellular transport of long-chain fatty acids. Elevated serum levels have been detected in acute and chronic liver failure, kidney failure, and some malignancies. Materials and Methods: We conducted a prospective, single-center study from July 2023 to January 2025, including 29 adult patients who underwent deceased-donor transplantation. Three patients were excluded due to inadequate sample withdrawals. Serum L-FABP was measured preoperatively and on postoperative days 1, 3, 5, 7, and 14. Clinical, surgical, and biochemical data were collected and analyzed using non-parametric statistical tests. Results: L-FABP levels were significantly higher on POD 7 in recipients of grafts from donors ≥ 65 years (p = 0.035), with no corresponding changes in standard liver function markers. While no significant differences in L-FABP levels were found between patients with and without infectious biliary or vascular complications (all p > 0.05), we proved a strong negative correlation between intraoperative blood transfusion volume and L-FABP levels on POD 5 (ρ = −0.677, p < 0.001) and POD 7 (ρ = −0.455, p = 0.025). Conclusions: Our findings suggest that L-FABP holds promise as a biomarker for the early detection of subclinical hepatic graft cellular injury, which is not detected by means of conventional biomarkers for liver function.
Ključne besede: liver transplantation, biomarker, L-FABP, hepatic graft injury, marginal liver graft
Objavljeno v DiRROS: 11.12.2025; Ogledov: 241; Prenosov: 167
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4.
Correlation of oxidative stress biomarkers with activity of pediatric idiopathic nephrotic syndrome
Matjaž Kopač, Aleš Jerin, Ema Bohinc, Joško Osredkar, 2025, izvirni znanstveni članek

Povzetek: Background/Objectives: This study investigated the correlation of oxidative stress biomarkers with the activity of idiopathic nephrotic syndrome (INS) in Slovenian children. Methods: In this prospective study, sequential plasma and urine samples from 20 children with INS in different phases of disease activity were taken: at first disease presentation or relapse (before glucocorticoid (GC) treatment), at time of remission achievement, and after discontinuation of GC treatment. This study measured oxidative stress biomarkers, such as 8-hydroxy-2′-deoxyguanosine (8-OHdG), hexanoyl-lysine (HEL) adduct, dityrosine (DiY), and 15-isoprostane F2t, using competitive enzyme-linked immunosorbent assay (ELISA) and assessed oxidative status using the FRAS 5 analytical system, which enables rapid photometric measurement of both oxidative and antioxidant capacity from biological fluids. Two complementary tests were performed: the d-ROMs test (derivatives of reactive oxygen metabolites) and the PAT (plasma antioxidant test). The oxidative stress index (OSI) was calculated as the ratio between them. Results: Concentrations of isoprostanes in urine were statistically significantly lower in patients at first disease presentation or relapse compared to time of remission achievement. Values of PAT test in serum were significantly highest after GC treatment. Values of d-ROMs test in serum were significantly lower at time of remission achievement compared to first disease presentation or relapse. Values of 8-OHdG, HEL, DiY (in plasma and urine), isoprostanes, and OSI in plasma did not statistically significantly differ in various phases of disease activity. Conclusions: Isoprostanes in urine and PAT in serum could serve as potential biomarkers of oxidative stress and disease activity in children with INS.
Ključne besede: oxidative stress biomarkers, idiopathic nephrotic syndrome, children, oxidative stress index
Objavljeno v DiRROS: 27.11.2025; Ogledov: 276; Prenosov: 123
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5.
A cross-sectional study of laboratory parameters 5–6 months after the first COVID-19 infection
Taja Zore, Jasna Lojk, Katarina Reberšek, Elizabeta Božnar Alič, Urška Čegovnik Primožič, Alenka France Štiglic, Aleš Jerin, Irena Prodan Žitnik, Helena Podgornik, Nada Snoj, Barbara Ostanek, Gabriele Turel, Tatjana Lejko-Zupanc, Janja Marc, Darko Černe, 2025, izvirni znanstveni članek

Povzetek: Objectives: Despite extensive study of COVID-19 disease, only a few studies also addressed the aftermath of the disease and potential long-term consequences. The aim of this study was to assess COVID-19 resolution through the cross-sectional analysis of an extensive range of haematological and biochemical laboratory parameters and to find potential markers still associated with disease severity 5-6-months post infection. Methods: In this study, we analysed 92 routine biochemical, haematological and immunological parameters in 75 non-vaccinated patients 5–6 months after recorded first time SARS-CoV-2 infection without reinfection. Demographic and disease severity data were obtained through surveys. Results: The majority of analysed parameters were within the normal reference intervals, however, statistically significant correlations with the disease severity were detected in 15 parameters: B lymphocytes, NK cells, interleukin (IL)-12, IL-1β, cortisol, ferritin, SARS-CoV-2 specific IgG and IgM antibodies, Na, Cl, creatinine, alkaline phosphatase, cholesterol, HbA1c and alpha 2 and beta 2 globulin fractions of the proteinogram. Conclusions: Although most observed parameters returned to their normal reference intervals, significant correlations were still observed with disease severity, that could indicate either the pre-infection baseline state which affected disease outcome or minor remaining alterations in function of certain organs, pertaining their stress or damage during the acute phase of the disease.
Ključne besede: disease severity, laboratory parameters, resolution, COVID-19, SARS-CoV-2, laboratory diagnosis
Objavljeno v DiRROS: 07.11.2025; Ogledov: 314; Prenosov: 135
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6.
Seasonal variation of total and bioavailable 25-hydroxyvitamin D [25(OH)D] in the healthy adult Slovenian population
Joško Osredkar, Vid Vičič, Maša Hribar, Evgen Benedik, Darko Siuka, Aleš Jerin, Urška Čegovnik Primožič, Teja Fabjan, Kristina Kumer, Igor Pravst, Katja Žmitek, 2024, izvirni znanstveni članek

Povzetek: Objective: The aim of our study was to compare the total 25(OH)D fraction, the bioavailable vitamin fraction, and the free vitamin D fraction in spring and fall in a group of healthy individuals. Methods: In our study, we collected blood samples from healthy participants at the end of both summer and winter, and measured serum levels of albumin, DBP, and 25(OH)D. Utilizing these data, we calculated the percentage of free and bioavailable vitamin D. Our cohort comprised 87 participants, with a maleto- female ratio of 14:73, aged 35.95 ± 12.55 years, ranging from 19 to 70 years. We employed the chemiluminescence method to determine the vitamin 25(OH)D levels, the ELISA method was utilized to determine DBP levels, the albumin BCP Assay was performed using the ADVIA biochemical analyzer (Siemens) and an online calculator was used to determine the free and bioavailable 25(OH)D levels. Results: Our findings indicate significantly lower 25(OH)D levels in winter (44.13 ± 17.82 nmol/L) compared to summer (74.97 ± 22.75 nmol/L; p < 0.001). For vitamin D binding protein there was no significant difference from summer (236.2 ± 164.39 mg/L) to winter (239.86 ± 141.9 mg/L; p = 0.77), albumin levels were significantly higher in summer (49.37 ± 4.15 g/L vs. 47.97 ± 3.91 g/L, p = 0.01), but the magnitude of the change may not be large enough to be solely responsible for the stability of vitamin D levels throughout the year. In the winter season a significantly lower calculated bioavailable 25(OH)D vitamin (7.45 ± 5.66 nmol/L against 13.11 ± 8.27 nmol/L; p < 0.001) was observed, and the free fraction also showed a significant decrease (17.3 ± 12.9 pmol/L versus 29.7 ± 19.1 pmol/L; p < 0.0001). We observed a moderately positive correlation between 25(OH)D and bioavailable percentage in winter (r = 0.680; p < 0.001), in contrast with a lower positive association in summer (r = 0.343; p < 0.001). Conclusion: Our data suggest a positive correlation between total and bioavailable 25(OH)D levels. In addition to the statistically significant variation in 25(OH)D between the two observation periods, there was an additional variation in the free vitamin D percentage. The summertime synthesis of vitamin D in the skin could contribute directly to the free fraction of vitamin D. Standardizing the measurement of free 25(OH)D and clinical studies is necessary to establish reference values before these methods can be implemented in clinical practice.
Ključne besede: body mass index, ultraviolet, D3, cholecalciferol, D2, ergocalciferol, total 25(OH)D, 25-hydroxycholecalciferol, calcifediol, calcidiol, 25-hydroxyvitamin, 1, 25-(OH)D, 1, 25-dihydroxyvitamin D, vitamin D binding protein, Odds ratio
Objavljeno v DiRROS: 02.10.2025; Ogledov: 385; Prenosov: 179
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7.
Higher levels of total pepsin and bile acids in the saliva as a possible risk factor for early laryngeal cancer
Maja Šereg Bahar, Aleš Jerin, Irena Hočevar-Boltežar, 2015, izvirni znanstveni članek

Povzetek: Background. Gastroesophageal reflux is suspected to be an etiological factor in laryngeal and pharyngeal cancer. The aim of this study was to establish, using a non-invasive method, whether laryngopharyngeal reflux (LPR) appears more often in patients with early laryngeal cancer than in a control group. Patients and methods. We compared the pH, the level of bile acids, the total pepsin and the pepsin enzymatic activity in saliva in a group of 30 patients with T1 laryngeal carcinoma and a group of 34 healthy volunteers. Results. The groups differed significantly in terms of levels of total pepsin and bile acids in the saliva sample. Higher levels of total pepsin and bile acids were detected in the group of cancer patients. No significant impact of other known factors influencing laryngeal mucosa (e.g. smoking, alcohol consumption, and the presence of irritating substances in the workplace) on the results of saliva analysis was found. Conclusions. A higher level of typical components of LPR in the saliva of patients with early laryngeal cancer than in the controls suggests the possibility that LPR, especially biliary reflux, has a role in the development of laryngeal carcinoma.
Ključne besede: laryngopharyngeal reflux, gastric acid, pepsin, bile acids, laryngeal carcinoma
Objavljeno v DiRROS: 17.04.2024; Ogledov: 1100; Prenosov: 414
.pdf Celotno besedilo (558,42 KB)

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