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Epidermal fatty acid-binding protein (E-FABP) was isolated from human skin and purified to homogeneity. Its molecular mass was estimated to be 15 kDa and the pI of non-denaturing protein was 5.6. Scatchard-plot analysis revealed one class of binding site for oleic acid with a Kd of 0.46 microM. Structure-binding relation experiments revealed a high affinity of E-FABP for stearic acid which decreased on reduction of the number of carbon atoms or introduction of double bonds into the fatty acid chain. Squalene, cholesterol and retinoic acid isomers showed no affinity, suggesting that E-FABP displays high specificity for fatty acids. E-FABP is a scarce cytosolic protein (0.065% of total protein). Only trace amounts could be detected in normal human skin but up to 42.5 +/- 3.4 pmol/mg of protein was found in a non-malignant defect of keratinocyte differentiation (psoriatic lesions). E-FABP levels were low in cultured human keratinocytes grown under proliferation-stimulating conditions but increased about 2-fold on induction of differentiation by Ca2+. Immunohistochemical localization showed cytosolic staining in differentiated cells of normal and psoriatic skin, suggesting a link between E-FABP and keratinocyte differentiation. The presence of E-FABP in tissues other than skin (heart, intestine and adipose tissue) excludes its specific role in fatty acid metabolism in epithelial cells or its involvement in skin lipid-barrier function.

biochemical journal

Purification and characterization of the human epidermal fatty acid-binding protein: localization during epidermal cell differentiation <i>in vivo</i> and <i>in vitro</i>

Purification and characterization of the human epidermal fatty acid-binding protein: localization during epidermal cell differentiation in vivo and in vitro