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Metabolism of estrogene in UGT1A1-deficient rats
Módos, Anna ; Muchová, Lucie (advisor) ; Brůha, Radan (referee)
Introduction Estrogen-induced cholestasis is a disease characterized by a failure of bile flow and bile production. It can develop in women after oral contraceptives use, hormone replacement therapy or during pregnancy. The estrogen metabolism is a complex process leading to formation of metabolites with different biological activities. It takes place primarily in the liver (Phase I and Phase II including hydroxylation, methylation, sulfation and glucuronidation). The enzymes from UDP-glucuronosyltransferases family , abbreviated UGT, are responsible for the glucuronidation of estrogens. Aims The objective of my work is to define estrogen metabolism and gene expression of UGT1A1, CYP1A2 and SULT1A1 and characterize cholestatic liver damage in the UGT1A1 deficient rat strain (Gunn rats) compared to rats with normal enzyme activity and try to define possible mechanisms responsible for the liver damage. Methods Adult female Gunn and corresponding heterozygous rats were treated with ethinylestradiol (EE, 5 mg/kg body weight SC) for 5 days, while control rats received propanediol (vehicle). Day six, the animals were sacrificed and plasma and liver tissue were collected for analysis. Markers of cholestasis and liver damage ALP, AST, ALT and bilirubin were determined using an automatic analyzer, total...
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Gilbert Syndrome.
Šimáková, Eva ; Kuklík, Miloslav (advisor) ; Kovář, Jan (referee)
This thesis focuses on finding a possible link between genotype typical for Gilberts syndrome and specific diseases. It nvestigates a possible protective effect of the 7TA allele. It explains the origin, symptoms, pathology of this syndrome and its consequences for clinical medicine. Possible protective effect of this polymorphic mutation including reduced incidence of vascular diseases (myocardial infarction, stroke, atherosclerosis, etc.). is discussed. Reduced oxidative stress in hyperbilirubinaemia can be the mechanism behind. The work was carried out in the co-operation with the GENVIA laborator.
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Inherited Disorders of Bilirubin Metabolism
Šlachtová, Lenka ; Martásek, Pavel (advisor) ; Baxová, Alice (referee)
Inherited disorders of bilirubin metabolism - hereditary hyperbilirubinemias - are metabolic disorders manifested in early childhood. Unconjugated hyperbilirubinemias result from the defect of the enzyme uridine diphosphoglucuronosyltransferase (UGT1A1). UGT1A1 mediates the conjugation of bilirubin with glucuronid acid in hepatocytes and its elimination to water soluble compound. In the next step of bilirubin degradation the transport of conjugated bilirubin from hepatocyte into the bile occure. It is caused by the ATP dependent transporters ABCC2, ATP1B1 and OATP1B3. Mutations in the genes coding the bilirubin transporters results in conjugated hyperbilirubinemia Dubin-Johnson or Rotor syndrome. This study is focused on unconjugated hyperbilirubinemia in adolescents including the non-typical manifestations and the defects of ABCC2 transporter and their phenotype in humans.
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The study of new risk factors of the cardiovascular diseases
Eremiášová, Lenka ; Danzig, Vilém (advisor) ; Vrablík, Michal (referee) ; Rosolová, Hana (referee)
Bilirubin is a major product of the heme catabolism in the vascular bed with substantial antioxidant properties. These importantly contribute to pathogenesis of diseases associated with increased oxidative stress, including cardiovascular or cancer diseases. In the first part of this PhD project serum bilirubin concentrations were examined in the 1 % representative sample of the general Czech population, together with determination of the prevalence of Gilbert's syndrome. Bilirubin concentrations were determined also within individual polymorphisms of the UGT1A1 gene (OMIM*191740) responsible for bilirubin biotransformation in the liver, including their association with the basic risk factors for atherosclerosis. We also assessed the activity of the standard liver enzymes (representing another significant risk factor for the development of cardiovascular diseases) with surprisingly high proportion of subjects with elevated values. Simultaneously, we determined the concentrations of serum bilirubin in a group of patients with an acute coronary syndrome, who manifested with significantly lower concentrations as compared to general population. In the second part of this research project, the relationship between plasma concentrations of bilirubin and individual variants of UGT1A1 gene polymorphisms...
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Inherited Disorders of Bilirubin Metabolism
Šlachtová, Lenka ; Martásek, Pavel (advisor) ; Baxová, Alice (referee)
Inherited disorders of bilirubin metabolism - hereditary hyperbilirubinemias - are metabolic disorders manifested in early childhood. Unconjugated hyperbilirubinemias result from the defect of the enzyme uridine diphosphoglucuronosyltransferase (UGT1A1). UGT1A1 mediates the conjugation of bilirubin with glucuronid acid in hepatocytes and its elimination to water soluble compound. In the next step of bilirubin degradation the transport of conjugated bilirubin from hepatocyte into the bile occure. It is caused by the ATP dependent transporters ABCC2, ATP1B1 and OATP1B3. Mutations in the genes coding the bilirubin transporters results in conjugated hyperbilirubinemia Dubin-Johnson or Rotor syndrome. This study is focused on unconjugated hyperbilirubinemia in adolescents including the non-typical manifestations and the defects of ABCC2 transporter and their phenotype in humans.
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Metabolism of estrogene in UGT1A1-deficient rats
Módos, Anna ; Muchová, Lucie (advisor) ; Brůha, Radan (referee)
Introduction Estrogen-induced cholestasis is a disease characterized by a failure of bile flow and bile production. It can develop in women after oral contraceptives use, hormone replacement therapy or during pregnancy. The estrogen metabolism is a complex process leading to formation of metabolites with different biological activities. It takes place primarily in the liver (Phase I and Phase II including hydroxylation, methylation, sulfation and glucuronidation). The enzymes from UDP-glucuronosyltransferases family , abbreviated UGT, are responsible for the glucuronidation of estrogens. Aims The objective of my work is to define estrogen metabolism and gene expression of UGT1A1, CYP1A2 and SULT1A1 and characterize cholestatic liver damage in the UGT1A1 deficient rat strain (Gunn rats) compared to rats with normal enzyme activity and try to define possible mechanisms responsible for the liver damage. Methods Adult female Gunn and corresponding heterozygous rats were treated with ethinylestradiol (EE, 5 mg/kg body weight SC) for 5 days, while control rats received propanediol (vehicle). Day six, the animals were sacrificed and plasma and liver tissue were collected for analysis. Markers of cholestasis and liver damage ALP, AST, ALT and bilirubin were determined using an automatic analyzer, total...
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Gilbert Syndrome.
Šimáková, Eva ; Kuklík, Miloslav (advisor) ; Kovář, Jan (referee)
This thesis focuses on finding a possible link between genotype typical for Gilberts syndrome and specific diseases. It nvestigates a possible protective effect of the 7TA allele. It explains the origin, symptoms, pathology of this syndrome and its consequences for clinical medicine. Possible protective effect of this polymorphic mutation including reduced incidence of vascular diseases (myocardial infarction, stroke, atherosclerosis, etc.). is discussed. Reduced oxidative stress in hyperbilirubinaemia can be the mechanism behind. The work was carried out in the co-operation with the GENVIA laborator.
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Gilbetr syndrome
Šimáková, Eva ; Kuklík, Miloslav (advisor) ; Kučerová, Mária (referee)
The mail focus of this thesis is to assess a genealogical frequency of homo- and heterozygotes for a mutation in a promotor region of UGT 1A1 gene. This mutation is typical for Gilbert's syndrome. It explains a genesis, symptoms, pathology and also a therapy of this syndrome. It discusses a possibly protective effect of this polymorphic mutation that might result in a lower incidence of vascular diseases (myocardial infarction, stroke, atherosclerosis, pulmonary embolism). An important contribution is also an attenuation of stress due to hyperbilirubinaemia. This thesis was worked out in a cooperation with GENVIA Ltd.
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