Nail plate corneocyte

Nail plate corneocytes, specifically referred to as onychocytes, are the highly specialized, flattened, and dead cells that constitute the bulk of the nail plate. These cells originate from the nail matrix and undergo a unique keratinization process, resulting in a structure that is significantly harder and less flexible than the stratum corneum of the skin [1][2]. They are primarily composed of a dense network of hard (hair-like) and soft (skin-like) keratins, which are extensively cross-linked by disulfide bonds and interconnected by numerous desmosomes [3]. The primary biological role of these cells is to provide a durable, protective shield for the fingertips and toes, while also assisting in fine motor tasks and tactile sensitivity [4]. In clinical practice, nail plate corneocytes are not traditional molecular targets but serve as the primary physical barrier to topical therapy for conditions like onychomycosis and nail psoriasis [5]. Pharmacological intervention often involves the use of keratolytic agents, such as high-concentration urea, which chemically modify the corneocyte matrix to enhance the permeability of antifungal or corticosteroid treatments [6].

Other names

OnychocyteNail cellKeratinized nail cellCorneocyte of the nail

Keratolytic agents disrupt the keratin matrix and intercellular desmosomal bridges within the corneocytes to increase nail porosity and facilitate drug penetration.