Michael Waterman
Faculty Member
Last active: 2/12/2015

Differentiating keratinocytes express a novel cytochrome P450 enzyme, CYP2B19, having arachidonate monooxygenase activity.

Keeney DS, Skinner C, Travers JB, Capdevila JH, Nanney LB, King LE, Waterman MR
J Biol Chem. 1998 273 (48): 32071-9

PMID: 9822682 · DOI:10.1074/jbc.273.48.32071

The novel cytochrome P450, CYP2B19, is a specific cellular marker of late differentiation in skin keratinocytes. CYP2B19 was discovered in fetal mouse skin where its onset of expression coincides spatially (upper cell layer) and temporally (day 15.5) with the appearance of loricrin-expressing keratinocytes during the stratification stage of fetal epidermis. CYP2B19 is also present postnatally in the differentiated keratinocytes of the epidermis, sebaceous glands, and hair follicles. CYP2B19 mRNA is tightly coupled to the differentiated (granular cell) keratinocyte phenotype in vivo and in vitro. In primary mouse epidermal keratinocytes, it is specifically up-regulated and correlated temporally with calcium-induced differentiation and expression of the late differentiation genes loricrin and profilaggrin. Recombinant CYP2B19 metabolizes arachidonic acid and generates 14,15- and 11, 12-epoxyeicosatrienoic (EET) acids, and 11-, 12-, and 15-hydroxyeicosatetraenoic (HETE) acids (20, 35, 18, 7, and 7% of total metabolites, respectively). Arachidonic acid metabolism was stereoselective for 11S,12R- and 14S,15R-EET, and 11S-, 12R-, and 15R-HETE. The CYP2B19 metabolites 11,12- and 14,15-EET are endogenous constituents of murine epidermis and are present in similar proportions to that generated by the enzyme in vitro, suggesting that CYP2B19 might be the primary enzymatic source of these EETs in murine epidermis.

MeSH Terms (29)

Amino Acid Sequence Animals Arachidonic Acids Aryl Hydrocarbon Hydroxylases Base Sequence Biomarkers Cell Differentiation Cells, Cultured Cytochrome P450 Family 2 Epidermal Cells Epidermis Fetus Gene Expression Regulation, Enzymologic Hair Keratinocytes Keratins Membrane Proteins Mice Mixed Function Oxygenases Molecular Sequence Data Oxygenases Rats RNA, Messenger Sebaceous Glands Sequence Alignment Sequence Homology, Amino Acid Skin Substrate Specificity Transcription, Genetic

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