Comparison of epidermal growth factor binding and receptor distribution in normal human epidermis and epidermal appendages.

To localize epidermal growth factor (EGF) receptors in normal human epidermis and other skin structures, two different light microscopic methods were used. EGF binding [( 125I]EGF/R) to the extracellular portion of the EGF receptor was studied by incubating intact skin samples with [125I]EGF, sectioning the tissues, and performing autoradiography. Immunoreactive EGF receptor molecules (IR-EGF/R) were localized with a mono-specific anti-EGF receptor antibody using a 2-step indirect immunocytochemical method (horseradish peroxidase) and detergent permeabilized tissues. This latter method measured the total pool of EGF receptors: occupied and/or internalized forms, precursor forms, and partially degraded forms of the EGF receptor that retain immunoreactivity. Both the [125I]EGF/R and IR-EGF/R localization studies indicated that EGF receptors were present in basal epidermal keratinocytes, sebocytes, outer root sheath cells in hair follicles, smooth muscle cells of arrector pili muscles, and dermal arteries. The highest levels of [125I]EGF/R and IR-EGF/R were found in the dermal ducts of eccrine sweat glands. The distribution of both [125I]EGF/R and IR-EGF/R was not consistent with the concept that EGF exclusively is involved in cellular division and proliferation in normal human epidermis and its appendages, i.e., EGF receptors were also found in tissues that do not undergo rapid proliferation. The present study indicates that EGF may have a more complex regulatory role in the skin than was previously thought.

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