Sökning: "Hydroxylation"

Visar resultat 1 - 5 av 79 avhandlingar innehållade ordet Hydroxylation.

  1. 1. Steroid-Metabolizing Cytochrome P450 (CYP) Enzymes in the Maintenance of Cholesterol and Sex Hormone Levels

    Författare :Hanna Pettersson; Maria Norlin; Kjell Wikvall; Paolo Parini; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; CYP27A1; CYP7B1; cytochrome P450; estrogen receptor; androgen receptor; cholesterol; sex hormone; hydroxylation; steroid metabolism; regulation of steroid levels; Pharmaceutical biochemistry; Farmaceutisk biokemi; Farmaceutisk biokemi; Pharmaceutical Biochemistry;

    Sammanfattning : The enzymes CYP27A1 and CYP7B1 are widely expressed in various human tissues and perform catalytic reactions in cholesterol homeostasis and endocrine signaling. We have investigated the metabolism of a synthetic oxysterol. LÄS MER

  3. 2. Water film-mediated mineralogical transformations and photocatalytic reactions

    Författare :N. Tan Luong; Jean-Francois Boily; Michael Holmboe; Alejandro Fernandez-Martinez; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; mineral; water films; carbon dioxide; MgO; MnCO3; TiO2; hydroxylation; carbonation; oxidation; transformation; photocatalysis; Inorganic Chemistry; oorganisk kemi; nanomaterials; nanomaterial; Physical Chemistry; fysikalisk kemi;

    Sammanfattning : Mineral particles capture water vapor in the atmosphere in the form of water films that are only few monolayers thick. Water films form nanoscale hydration environments that mediate a wide range of important reactions in nature and technology. LÄS MER

  4. 3. In vivo Pharmacokinetic Interactions of Finasteride and Identification of Novel Metabolites

    Författare :Anna Lundahl; Hans Lennernäs; Dennis A Smith; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; drug-drug interactions; herb-drug interactions; pharmacokinetics; metabolism; CYP3A4; hydroxylation; glucuronidation; UGT enzymes; mass spectrometry; biliary excretion; urinary excretion; finasteride; PHARMACY; FARMACI;

    Sammanfattning : The general aim of this thesis was to improve the understanding of the in vivo pharmacokinetics and, in particular, the metabolism of finasteride, a 5α-reductase inhibitor used in the treatment of enlarged prostate glands and male pattern baldness. CYP3A4 has been identified as the major enzyme involved in the sequential metabolism of finasteride to ω-OH finasteride (M1) and ω-COOH finasteride (M3). LÄS MER

  5. 4. Toxicometabolomics and biotransformation product screening in single zebrafish embryos

    Författare :Anton Ribbenstedt; Jonathan P. Benskin; Magnus Breitholtz; Elena Gorokhova; Emma Schymanski; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Non-target; REACH; Orbitrap; single embryo; zebrafish embryo; metabolism; high throughput; hydroxylation; glucuronidation; metabolite screening; phase I; phase II; pharmaceutical; structure elucidation; conjugation; propranolol; beta blocker; Non-targeted; toxicometabolomics; Orbitrap; single embryo; 3R; metabolomics; MoA; mode of action; zebrafish embryo; carbamazepine; biotransformation; Applied Environmental Science; tillämpad miljövetenskap;

    Sammanfattning : Over the last decade environmental agencies worldwide have escalated their work to phase out animal testing for the purposes of chemical regulation. Meanwhile the number of commercially available chemicals and the requirements for hazard assessments have both increased, creating a large need for substitution of traditional in vivo assays with in vitro tests. LÄS MER

  7. 5. Cholesterol homeostasis in the brain : importance of 24S-hydroxylation

    Författare :Dieter Lütjohann; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Brain cholesterol is characterized by a very low turnover with very little exchange with lipoproteins in the circulation. We have investigated whether side chain-hydroxylated cholesterol species are important for elimination of cholesterol from the brain. About 80% of 24S-hydroxycholesterol (24S-OH-Chol) present in the body is present in the brain. LÄS MER