Dermoepidermic junction (DEJ) is a highly complex region, containing a great variety of cellular elements, which despite of having different embriogenesis, interact with each other, generating different substances that keep the function and homeostasis of the greatest organ of the human body. DEJ is regarded as a highly specialized basal lamina, which acts as a highly selective pathway for the migration of cells and macromolecules, inducing cellular differentiation and micro enviromental metabolism modifications. DEJ may be divided into three zones regarding the basal lamina 1--the nearest to epidermic zone, having tonofilaments and hemidesmosomes, which keep anchored basal cells. This region is limited by the lamina densa 2--the intermediate zone, represented exclusively by lamina densa and finally the lamina 3,--the third region--extends from lamina densa to the upper dermis and extracelullar matrix. Despite there is much to learn about DEJ, the knowledge about each molecule and function of every compartment will enable us to know more about the pathogenesis of several dermatologic diseases, with a great prevalence in the clinical practice.
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