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CYP4F8 in Plexiform Layers of the Retina and CYP4F8 Expression in Human Corneal Epithelium
Uppsala University, Medicinska vetenskapsområdet, Faculty of Pharmacy, Department of Pharmaceutical Biosciences.
Article in journal (Refereed) Submitted
URN: urn:nbn:se:uu:diva-92822OAI: oai:DiVA.org:uu-92822DiVA: diva2:166124
Available from: 2005-04-08 Created: 2005-04-08Bibliographically approved
In thesis
1. Catalytic Properties and Tissue Distribution of Cytochrome P450 4F8 and 4F12: Expression of CYP4F8 in Eye Tissues and Psoriatic Lesions
Open this publication in new window or tab >>Catalytic Properties and Tissue Distribution of Cytochrome P450 4F8 and 4F12: Expression of CYP4F8 in Eye Tissues and Psoriatic Lesions
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The human cytochrome P450 (CYP) family of monooxygenases is important for metabolism of drugs and endogenous compounds, e.g., vitamin A and D, cholesterol, steroids, fatty acids, and eicosanoids. This thesis describes the tissue distribution, catalytic properties, and possible function of CYP4F8 and CYP4F12. To this respect, methods for immunohistological analysis, and real-time PCR for analysis of their transcripts, were developed.

CYP4F8 was originally cloned from human seminal vesicles and proposed to catalyze 19-hydroxylation of prostaglandin H2 (PGH2). This notion could now be supported, as cyclooxygenase-2, CYP4F8, and microsomal prostaglandin E synthase-1 were found to be co-localized in the epithelial linings of seminal vesicles. The three enzymes were also co-localized in the suprabasal layers of epidermis, suggesting a similar function of CYP4F8 in skin. Real-time PCR showed that CYP4F8 mRNA was more than 10-fold increased in psoriatic lesions compared to non-lesional skin. CYP4F8 immunoreactivity was also found in kidney cortex, transitional epithelium, corneal epithelium, and retina. Although transcripts of all three enzymes were detectable in retina, no co-localization was found. Pro inflammatory stimuli were found to increase CYP4F8 mRNA expression in cultured epidermal and corneal keratinocytes. In these tissues CYP4F8 might oxidize fatty acids or other eicosanoids than PGH2.

CYP4F12 was originally cloned from the liver and small intestine, and found to oxidize arachidonic acid and two anti-histamines. Immunohistological studies showed that CYP4F12 immunoreactivity was present mainly in the gastrointestinal tract, e.g., stomach, ilium, and colon, but also in placenta. Although CYP4F8 and CYP4F12 have catalytic properties in common, there are important differences. CYP4F12 does not oxidize PGH2, certain eicosanoids, and fatty acids. The prominent expression in the gut suggests that CYP4F12 might be involved in oxidation of drugs.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. 60 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Pharmacy, ISSN 1651-6192 ; 8
Pharmaceutical pharmacology, Arachidonic acid metabolism, Cytochrome P450, 19-Hydroxyprostaglandins, Immunohistochemistry, Ocular tissues, Psoriasis, Farmaceutisk farmakologi
National Category
Pharmacology and Toxicology
urn:nbn:se:uu:diva-5731 (URN)91-554-6200-6 (ISBN)
Public defence
2005-04-29, Room B22, Biomedicinskt Centrum (BMC), Husarg.3, Uppsala, 09:15
Available from: 2005-04-08 Created: 2005-04-08Bibliographically approved

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