Profile of epidermal metabolic activity in autosomal dominant ichthyosis and small bowel disorders

The in vitro incorporation of 14C acetate by the epidermis has been studied in patients with autosomal dominant ichthyosis and in patients with a dry, itchy, slightly scaly skin associated with a disorder of the small bowel. Analysis of 14C acetate containing lipid moieties by thin layer chromatography has indicated that there are both quantitative and qualitative differences in the uptake of 14C acetate between autosomal dominant ichthyosis and normal. In particular an increased incorporation into the triglyceride and phosphatidyl choline fractions was noted. No such differences were apparent in those patients with disorders of the small bowel. In addition the in vitro incorporation of radioactively labelled thymidine, proline and histidine has been studied in these patients. In both groups of patients the rate of incorporation of tritiated thymidine and histidine into epidermal macromolecules was found not to differ significantly from normal. On the other hand the rate of incorporation of tritiated proline was increased in both groups of patients.