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Kucharska J, Sumbalova Z, Rausova Z, Palacka P, Navas P, Lopez-Lluch G, Kovalcikova E, Takacsova T, Gvozdjakova A. Benefit of mountain spa rehabilitation and ubiquinol treatment in patients with post-COVID-19 syndrome. BRATISL MED J 2023; 124:89-96. [PMID: 36598293 DOI: 10.4149/bll_2023_013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
BACKGROUND SARS-CoV-2 infection is associated with inflammation, decrease in antioxidants and oxidative damage. We aimed to investigate whether ubiquinol, reduced form of coenzyme Q10 (CoQ10), with mountain spa rehabilitation (MR) will contribute to recovering of patients with post-COVID-19 syndrome. METHODS The study included 36 patients on MR lasting 16-18 days. Twenty‑two patients were supplemented with ubiquinol 2x100 mg/day (MRQ), 14 underwent MR without supplementation. The control group consisted of 15 healthy volunteers. Concentrations of total CoQ10 (ubiquinone + ubiquinol), α- and γ-tocopherol were determined in platelets (PLT), in blood and plasma, also β-carotene was determined. Plasma concentration of thiobarbituric acid‑reactive substances (TBARS) was used as the oxidative stress marker. Clinical symptoms were evaluated by questionnaire. RESULTS MRQ group showed a significant increase in CoQ10, namely in PLT by 68 %, in blood by 194 %, and in plasma by 232 %. In MR group, CoQ10 stayed unchanged. In both groups, the initially increased concentrations of tocopherols in PLT returned nearly to the control values. β-carotene levels decreased in both groups while TBARS decreased slightly in the MRQ group. More clinical symptoms disappeared in the MRQ group. CONCLUSION Accelerated recovery of patients with post-COVID-19 syndrome was proven after mountain spa rehabilitation and ubiquinol supplementation. Increased systemic and cellular CoQ10 concentration alleviated clinical symptoms and improved antioxidant protection of the patients. We draw attention to the importance of monitoring and ensuring adequate levels of CoQ10 in post-COVID-19 syndrome (Tab. 2, Fig. 1, Ref. 45). Text in PDF www.elis.sk Keywords: COVID-19, mountain spa rehabilitation, ubiquinol, coenzyme Q10, vitamins, TBARS.
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Sumbalova Z, Kucharska J, Palacka P, Rausova Z, Langsjoen PH, Langsjoen AM, Gvozdjakova A. Platelet mitochondrial function and endogenous coenzyme Q10 levels are reduced in patients after COVID-19. BRATISL MED J 2022. [PMID: 34967652 DOI: 10.4149/bll_2022_2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2023]
Abstract
BACKGROUND After an acute treatment for coronavirus disease (COVID-19), some symptoms may persist for several weeks, for example: fatigue, headaches, muscle and joint pain, cough, loss of taste and smell, sleep and memory disturbances, depression. Many viruses manipulate mitochondrial function, but the exact mechanisms of SARS-CoV-2 virus effect remain unclear. We tested the hypothesis that SARS-CoV-2 virus may affect mitochondrial energy production and endogenous biosynthesis of coenzyme Q10 (CoQ10). METHODS Ten patients after COVID-19 and 15 healthy individuals were included in the study. Platelets isolated from peripheral blood were used as an accessible source of mitochondria. High-resolution respirometry for the evaluation of platelets mitochondrial function, and HPLC method for CoQ10 determination were used. Oxidative stress was evaluated by TBARS concentration in plasma. RESULTS Platelet mitochondrial respiratory chain function, oxidative phosphorylation and endogenous CoQ10 level were reduced in the patients after COVID-19. CONCLUSION We assume that a reduced concentration of endogenous CoQ10 may partially block electron transfer in the respiratory chain resulting in a reduced adenosine triphosphate (ATP) production in the patients after COVID-19. Targeted mitochondrial therapy with CoQ10 supplementation and spa rehabilitation may improve mitochondrial health and accelerate the recovery of the patients after COVID-19. Platelet mitochondrial function and CoQ10 content may be useful mitochondrial health biomarkers after SARS-CoV-2 infection (Tab. 3, Fig. 3, Ref. 46).
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Sumbalova Z, Kucharska J, Palacka P, Rausova Z, Langsjoen PH, Langsjoen AM, Gvozdjakova A. Platelet mitochondrial function and endogenous coenzyme Q10 levels are reduced in patients after COVID-19. BRATISL MED J 2021; 123:9-15. [PMID: 34967652 DOI: 10.4149/bll_2022_002] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND After an acute treatment for coronavirus disease (COVID-19), some symptoms may persist for several weeks, for example: fatigue, headaches, muscle and joint pain, cough, loss of taste and smell, sleep and memory disturbances, depression. Many viruses manipulate mitochondrial function, but the exact mechanisms of SARS-CoV-2 virus effect remain unclear. We tested the hypothesis that SARS-CoV-2 virus may affect mitochondrial energy production and endogenous biosynthesis of coenzyme Q10 (CoQ10). METHODS Ten patients after COVID-19 and 15 healthy individuals were included in the study. Platelets isolated from peripheral blood were used as an accessible source of mitochondria. High-resolution respirometry for the evaluation of platelets mitochondrial function, and HPLC method for CoQ10 determination were used. Oxidative stress was evaluated by TBARS concentration in plasma. RESULTS Platelet mitochondrial respiratory chain function, oxidative phosphorylation and endogenous CoQ10 level were reduced in the patients after COVID-19. CONCLUSION We assume that a reduced concentration of endogenous CoQ10 may partially block electron transfer in the respiratory chain resulting in a reduced adenosine triphosphate (ATP) production in the patients after COVID-19. Targeted mitochondrial therapy with CoQ10 supplementation and spa rehabilitation may improve mitochondrial health and accelerate the recovery of the patients after COVID-19. Platelet mitochondrial function and CoQ10 content may be useful mitochondrial health biomarkers after SARS-CoV-2 infection (Tab. 3, Fig. 3, Ref. 46).
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Gvozdjakova A, Kucharska J, Sumbalova Z, Rausova Z, Chladekova A, Komlosi M, Szamosova M, Mojto V. The importance of coenzyme Q10 and its ratio to cholesterol in the progress of chronic kidney diseases linked to non- -communicable diseases. ACTA ACUST UNITED AC 2020; 121:693-699. [PMID: 32955899 DOI: 10.4149/bll_2020_113] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVES The mortality of patients with chronic kidney diseases (CKD) increases with the decrease in glomerular filtration rate (eGFR). In the progress of CKD that is closely linked to non-communicable diseases (NCDs), the role of coenzyme Q10 (CoQ10) is not fully evaluated. We aimed to evaluate the importance of CoQ10, CoQ10/cholesterol ratio, and oxidative stress in the progress of CKD. PATIENTS AND METHODS The control group was constituted of 19 healthy subjects who volunteered to enrol in the study, CKD group consisted of 58 patients with CKD, of whom 54 had CKD combined with hypertension, 22 had CKD combined with hypertension and diabetes type 2 , and 18 had CKD combined with hypertension and statin therapy. We observed age, BMI, creatinine, uric acid, eGFR, hemoglobin, CRP, glucose, lipids fraction, and liver enzymes. Coenzyme Q10-TOTAL (ubiquinol+ubiquinone) in platelets and plasma were determined using HPLC method with UV detection. Indexed of CoQ10/lipid fractions were evaluated. Oxidative stress was determined as thiobarbituric acid‑reactive substances (TBARS). RESULTS With increased stages of CKD, eGFR and CoQ10 as well as its ratio to lipids were significantly reduced while TBARS increased. CONCLUSION We assume that lower endogenous CoQ10 level may be one of the reasons of kidney dysfunction. CoQ10/lipids ratio and increase in oxidative stress can predict the progression of CKD in patients with arterial hypertension, diabetes mellitus and dyslipidemia (Tab. 2, Fig. 4, Ref. 49).
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Gvozdjakova A, Sumbalova Z, Kucharska J, Chladekova A, Rausova Z, Vancova O, Komlosi M, Ulicna O, Mojto V. Platelet mitochondrial bioenergetic analysis in patients with nephropathies and non-communicable diseases: a new method. ACTA ACUST UNITED AC 2019; 120:630-635. [PMID: 31475544 DOI: 10.4149/bll_2019_104] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVES To test the hypothesis if mitochondrial bioenergetic function analyzed in circulating platelets may represent peripheral signature of mitochondrial dysfunction in nephropathy associated to non-communicable human diseases such as cardiovascular diseases, diabetes and with statins treatment. METHODS High-resolution respirometry was used for analysis of mitochondrial bioenergetics in human platelets isolated from peripheral blood. This method is less-invasively compared to skeletal muscle biopsy. Patients with nephropathies and in combination with non-communicable diseases were included in the study. RESULTS This pilot study showed platelet mitochondrial bioenergy dysfunction in patients with nephropathies and non-communicable diseases. Positive effect of treatment with 10 mg atorvastatin on platelet mitochondrial respiratory chain Complex I-linked respiration and ATP production in patients with nephropathies, diabetes and 80 mg atorvastatin in patient with nephropathy and dialysis was found. Positive effect of 80 mg fluvastatin treatment, and negative effect of thrombocytopenia and renal transplantation on platelet mitochondrial bioenergy was determined. CONCLUSION High-resolution respirometry allowed detection of small changes in platelet mitochondrial function. This method could be used as a sensitive bioenergetic test of mitochondrial function for diagnosis and monitoring the therapy in patients with nephropathy (Tab. 1, Fig. 3, Ref. 39).
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Mojto V, Gvozdjakova A, Kucharska J, Rausova Z, Vancova O, Valuch J. Effects of complete water fasting and regeneration diet on kidney function, oxidative stress and antioxidants. ACTA ACUST UNITED AC 2018; 119:107-111. [PMID: 29455546 DOI: 10.4149/bll_2018_020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE The aim of the study was to observe the influence of 11-days complete water fasting (WF) and regeneration diet (RD) on renal function, body weight, blood pressure and oxidative stress. BACKGROUND Therapeutic WF is considered a healing method. METHODS Ten volunteers drank only water for 11 days, followed by RD for the next 11 days. Data on body weight, blood pressure, kidney functions, antioxidants, lipid peroxidation, cholesterols, triacylglycerols and selected biochemical parameters were obtained. RESULTS WF increased uric acid and creatinine and decreased glomerular filtration rate. After RD, the parameters were comparable to baseline values. Urea was not affected. Lipid peroxidation (TBARS) decreased and maintained stable after RD. Fasting decreased α-tocopherol and increased γ-tocopherol, no significant changes were found after RD. Coenzyme Q10 decreased after RD. HDL-cholesterol decreased in WF. Total- and LDL-cholesterol decreased after RD. Other biochemical parameters were within the range of reference values. CONCLUSIONS The effect of the complete fasting on kidney function was manifested by hyperuricemia. Renal function was slightly decreased, however maintained within the reference values. After RD, it returned to baseline values. The positive effect of the complete water fasting was in the reduction of oxidative stress, body weight and blood pressure (Tab. 3, Ref. 25).
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Mikulecky M, Rausova Z, Dedik L, Mojto V. Does seasonality of births in diabetes mellitus reflect pathogenetic differences? BRATISL MED J 2016; 117:501-504. [PMID: 27677192 DOI: 10.4149/bll_2016_097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVES This study indicates that the seasonality of births of patients with DM1 and DM2 has occurred in their adolescence or adulthood. BACKGROUND Patients with Diabetes mellitus type 2 (DM2) with the maturity onset have different seasonal birth patterns from those with Diabetes mellitus type 1 (DM1) with the maturity onset, or DM1children. METHODS Monthly numbers of births of 81 and 236 children with DM1 and DM2, respectively, in adolescent or adult age, were adapted to different actual length of calendar months. The 12- and 6-month rhythm was tested using the cosinor regression with 95% confidence interval versus the hypothesis of null seasonality. RESULTS Regarding DM1 with maturity onset, annual and semiannual rhythm was significant in both genders, with the increase in birth numbers from November to January and decrease in March, April and August. In DM2, only female data displayed a significant annual rhythm, with an increase in birth from April to August and decrease from October to December. CONCLUSION: The birth seasonality related to DM1 in adolescent or adult age appears to be reciprocal, compared to DM1 in childhood. For DM2, the seasonality of births was found only in females. The increase in female fecundity seems to be related to an increase in the risk of DM2 in female offspring. The outcomes could help in identifying environmental and endogenous factors related to seasonality cycle (Tab. 1, Fig. 1, Ref. 18).
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Mojto V, Kolcunova M, Rausova Z, Chrenova J, Dedik L. The nonskeletal effects of vitamin D3 and the threshold limit associated with the risk of health complications. BRATISL MED J 2016; 117:133-6. [PMID: 26925741 DOI: 10.4149/bll_2016_025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE To evaluate the threshold limit of vitamin D3 associated with the risk of nonskeletal health complications in humans. BACKGROUND Vitamin D3 deficiency is primary caused by a reduced sun exposure, consequent limiting of vitamin D3 production in the skin, and low intake of food with this vitamin. METHODS Ninety-two adults (25-95 years old) were admitted to III. Internal clinic or examined in outpatient department of The University hospital in Bratislava. Vitamin D3 levels were determined using electrochemical luminescence immunoassay. The least square method for the results processing was used. RESULTS Vitamin D3 level 16 ng/ml may be threshold limit for the risk of hypertension, ischaemic heart disease, renal insufficiency and diabetes mellitus. A higher occurrence of the observed diseases was in female and male patients with vitamin D3 levels<16 ng/ml.The highest increase of occurrence of diabetes mellitus in women for vitamin D3<16 ng/ml (160%) compared to vitamin D3≥16 ng/ml (40%) was observed. Concerning the men, the highest increase refers to ischaemic heart disease (67%). CONCLUSION The limit value of vitamin D3, 16 ng/ml, confirmed the association between vitamin D3 insufficiency and the presence of hypertension, ischaemic heart disease, renal insufficiency and diabetes mellitus. Its relation to age, sex and other variables was detected (Tab. 1, Fig. 5, Ref. 27).
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Mojto V, Rausova Z, Chrenova J, Dedik L. Short-term glucagon stimulation test of C-peptide effect on glucose utilization in patients with type 1 diabetes mellitus. Med Biol Eng Comput 2015; 53:1361-9. [PMID: 26607818 DOI: 10.1007/s11517-015-1416-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Accepted: 10/24/2015] [Indexed: 11/25/2022]
Abstract
This work aimed to evaluate the use of a four-point glucagon stimulation test of C-peptide effect on glucose utilization in type 1 diabetic patients using a new mathematical model. A group of 32 type 1 diabetic patients and a group of 10 healthy control subjects underwent a four-point glucagon stimulation test with blood sampling at 0, 6, 15 and 30 min after 1 mg glucagon bolus intravenous administration. Pharmacokinetic and pharmacokinetic/pharmacodynamic models of C-peptide effect on glucose utilization versus area under curve (AUC) were used. A two-sample t test and ANOVA with Bonferroni correction were used to test the significance of differences between parameters. A significant difference between control and patient groups regarding the coefficient of whole-body glucose utilization and AUC C-peptide/AUC glucose ratio (p ≪ 0.001 and p = 0.002, respectively) was observed. The high correlation (r = 0.97) between modeled coefficient of whole-body glucose utilization and numerically calculated AUC C-peptide/AUC glucose ratio related to entire cohort indicated the stability of used method. The short-term four-point glucagon stimulation test allows the numerically calculated AUC C-peptide/AUC glucose ratio and/or the coefficient of whole-body glucose utilization calculated from model to be used to diagnostically identify type 1 diabetic patients.
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Affiliation(s)
- Viliam Mojto
- IIIrd Clinic of Internal Medicine, Faculty of Medicine, Comenius University in Bratislava, Limbová 5, 833 05 Bratislava, Slovakia
| | - Zuzana Rausova
- Institute of Automation, Measurement and Applied Informatics, Faculty of Mechanical Engineering, Slovak University of Technology, Namestie slobody 17, 812 31, Bratislava, Slovakia
| | - Jana Chrenova
- Institute of Automation, Measurement and Applied Informatics, Faculty of Mechanical Engineering, Slovak University of Technology, Namestie slobody 17, 812 31, Bratislava, Slovakia.
| | - Ladislav Dedik
- Institute of Automation, Measurement and Applied Informatics, Faculty of Mechanical Engineering, Slovak University of Technology, Namestie slobody 17, 812 31, Bratislava, Slovakia
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Mojto V, Valuch J, Kucharska J, Mišianik J, Rausova Z, Gvozdjáková A. SP410DOES COMPLETE STARVATION AND REGENERATION DIET AFFECT THE KIDNEY FUNCTION IN HUMAN SUBJECTS? Nephrol Dial Transplant 2015. [DOI: 10.1093/ndt/gfv193.18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Abstract
PURPOSE/AIM The main aim of this study was to propose a method to express whole body insulin sensitivity as estimated by a hyperinsulinemic-euglycemic clamp (HEC) as a dimensionless parameter. MATERIALS AND METHODS Two groups of subjects were examined: The first group was comprised of seven healthy lean volunteers with BMI <25 kg/m(2) and a second group comprised of four obese subjects with BMI ≥30 kg/m(2). The dependence between the M/I index expressing the whole body insulin sensitivity, and the dimensionless whole human body effect E as a ratio of the clearance of glucose and the clearance of insulin after their exogenous administration during the last 40 min of the HEC test, was expressed by regression analysis. Unlike an expression of insulin sensitivity/resistance as a function of M taking into account the space corrections or the M/I index, our whole human body effect represents the insulin sensitivity/resistance as a dimensionless number. RESULTS A linear dependence between the M/I index and the dimensionless effect E with zero intercept and slope at 2.2623 ± 0.157, r = 0.914, and between the M/I index and the effect E recalculated per kg of human body weight with zero intercept and slope at 0.03164 ± 0.00127, r = 0.978, were observed. CONCLUSIONS The high correlation between the M/I index and new effect E in lean and obese volunteers confirms our proposal that the HEC test could be evaluated by a dimensionless parameter which eliminates potential unit mismatches in the expression of clamp results.
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Affiliation(s)
- Ladislav Dedik
- Faculty of Mechanical Engineering, Institute of Automation, Measurement and Applied Informatics, Slovak University of Technology , Bratislava , Slovakia
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Rausova Z, Chrenova J, Dedik L. Influence of Circulation System on Estimation of Absorption and Elimination Constant after per oral Drug Administration: A Reanalysis. Indian J Pharm Sci 2013; 75:171-7. [PMID: 24019565 PMCID: PMC3757855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Revised: 02/15/2013] [Accepted: 02/20/2013] [Indexed: 12/03/2022] Open
Abstract
This study aimed to identify the cause of atypical shape of measured concentration-time profile in the peak area by one compartment open model with a lag time (Bateman function with a lag) after single dose oral administration of drug published in "Pharmacokinetic and Pharmacodynamic Data Analysis: Concepts and Application" by Gabrielsson and Weiner (1997) and two concentration profiles after frequent sampling oral glucose tolerance test. Following the oral administration of 100 μg of substance A to human volunteer, frequent sampling was carried out and concentration-time profiles were obtained. Our hemodynamic circulatory structural model capable of parameters estimation of circulation and gastrointestinal subsystem to explain the plateau within the interval 40-100 min (substance A) and 15-30 min (glucose) of the measured concentration-time profile was developed. The mean residence time, the rate constants of absorption and elimination parameters of our model were calculated. Comparing to the Bateman function, our results demonstrate better approximation of the substance A and glucose concentration-time profile and estimation of absorption rate constant by our structural model. Obtained model results indicate that the atypical shape of measured concentration-time profile of single dose oral administration of drug was probably caused by the gastrointestinal and circulation system with deep compartment. This applies to the substances with high coefficient of absorption.
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Affiliation(s)
- Z. Rausova
- Institute of Automation, Measurement and Applied Informatics, Faculty of Mechanical Engineering, Slovak University of Technology, Namestie Slobody 17, 812 31 Bratislava, Slovakia
| | - J. Chrenova
- Institute of Automation, Measurement and Applied Informatics, Faculty of Mechanical Engineering, Slovak University of Technology, Namestie Slobody 17, 812 31 Bratislava, Slovakia,Address for correspondence: E-mail:
| | - L. Dedik
- Institute of Automation, Measurement and Applied Informatics, Faculty of Mechanical Engineering, Slovak University of Technology, Namestie Slobody 17, 812 31 Bratislava, Slovakia
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Rausova Z, Chrenova J, Nuutila P, Iozzo P, Dedik L. System approach to modeling of liver glucose metabolism with physiologically interpreted model parameters outgoing from [18F]FDG concentrations measured by PET. Comput Methods Programs Biomed 2012; 107:347-356. [PMID: 22465640 DOI: 10.1016/j.cmpb.2012.03.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Revised: 02/22/2012] [Accepted: 03/13/2012] [Indexed: 05/31/2023]
Abstract
New mathematical models from physiologically interpreted parameters capable of evaluating glucose metabolism within the liver and/or the whole body were developed. The group of pigs in a fasting state and the group of pigs with euglycemic supraphysiological hyperinsulinemia were scanned by positron emission tomography after a single dose of [(18)F]FDG tracer. Simultaneously frequent sampling of the dynamic data of [(18)F]FDG plasma concentration in artery, portal vein and hepatic vein was obtained. A system approach to the liver and/or the whole-body system by the tools of linear dynamic sysztem theory was used. Three kinds of structural models, single input and single output or multiple outputs and multiple inputs and single output, were identified. Differences between the group of fasting pigs and the group of pigs in euglycemic supraphysiological hyperinsulinemia were identified by estimated parameters of the structural models. The suitability of the structural mathematical models for the estimation of physiologically interpreted parameters from PET was validated.
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Affiliation(s)
- Zuzana Rausova
- Faculty of Mechanical Engineering, Slovak University of Technology, Bratislava, Slovakia.
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Tvrdonova M, Chrenova J, Rausova Z, Miklovicova D, Durisova M, Mircioiu C, Dedik L. Novel approach to bioequivalence assessment based on physiologically motivated model. Int J Pharm 2009; 380:89-95. [PMID: 19596057 DOI: 10.1016/j.ijpharm.2009.07.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2009] [Revised: 06/30/2009] [Accepted: 07/02/2009] [Indexed: 11/25/2022]
Abstract
The study was conducted to exemplify an approach capable of obtaining a new insight into bioequivalence (BE) assessment, by the use of a physiologically motivated model. Data from an oral BE study of two piroxicam (PXM) products was used as an example. The BE study was carried out with 24 healthy European subjects according to a two-sequence crossover-randomized design. The test and reference formulations were a PXM generic formulation (LaborMed Pharma, Romania) and Feldene (Pfizer, USA), respectively. Plasma concentrations of PXM were monitored by a validated high-performance liquid chromatography over a period of 144 h after administration. After the structure of the optimal model was selected, parameters that characterized the whole-body disposition behavior of PXM in the subjects were derived. The paired Student's t-test and Wilkoxon's test were performed on the derived parameters. The null hypothesis of no differences in the parameters of the whole-body disposition behavior of PXM related to the test and reference product was not rejected at 5% level of significance. This result suggested that the compared products were bioequivalent and could be used interchangeably in clinical setting. The presented approach might show a new way, worth incorporating in future BE guidelines.
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Affiliation(s)
- Martina Tvrdonova
- Institute of Automation, Measurement and Applied Informatics, Faculty of Mechanical Engineering, Slovak University of Technology, Bratislava, Slovakia
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