Skin cells and keratinized follicular epithelium

Skin cells and keratinized follicular epithelium represent a histological and anatomical complex rather than a single molecular target. This complex includes the stratified squamous epithelium of the epidermis and the specialized lining of the hair follicle's infundibulum and isthmus (StatPearls, Anatomy, Skin (Integument), Epidermis). These tissues serve as the primary physical barrier against environmental insults and are central to the development of dermatological conditions such as acne vulgaris, where follicular hyperkeratinization leads to ductal obstruction (PubMed, PMID: 28073163). Pharmacological intervention at this site often involves the use of topical agents like retinoids, which normalize the life cycle of keratinocytes by binding to Retinoic Acid Receptors (RARs), or keratolytics like salicylic acid, which promote the shedding of the cornified layer (NIH, Retinoids in the treatment of skin aging). Because this is a multi-cellular tissue system, therapeutic effects are mediated through various molecular pathways, including nuclear receptor signaling and enzymatic degradation of desmosomes. Consequently, while it is a focus of dermatological therapy, it does not meet the strict definition of a discrete molecular therapeutic target.

Other names

Epidermal cellsFollicular epitheliumPilosebaceous unitKeratinocytesInfundibular epithelium

Drugs targeting these tissues typically act by modulating keratinocyte proliferation and differentiation, inducing keratolysis to clear follicular obstructions, or exerting anti-inflammatory effects through interaction with intracellular receptors like Retinoic Acid Receptors (RARs).