Intercellular cement substance (ICS)

Intercellular cement substance (ICS) is a histological term describing the glycoprotein-rich material located between the keratinocytes of the stratified squamous epithelium, particularly within the epidermis. It functions primarily as a biological adhesive that maintains the structural integrity of the skin by facilitating cell-cell adhesion through specialized structures known as desmosomes. The primary molecular components of this substance are desmogleins (DSG1 and DSG3), which are members of the cadherin superfamily of calcium-dependent adhesion molecules (Source: StatPearls, Pemphigus Vulgaris, 2023). In clinical pathology, the intercellular cement substance is significant as the primary site of autoantibody deposition in pemphigus group diseases. In these conditions, IgG autoantibodies target the desmogleins within the ICS, leading to a loss of cell-to-cell adhesion—a process known as acantholysis—which results in the formation of intraepidermal blisters. While the ICS itself is not a drug target in the traditional sense of a receptor being activated or inhibited by a small molecule, it is the antigenic target of the underlying autoimmune pathophysiology. Modern therapeutic strategies focus on depleting the B-cells responsible for producing anti-ICS antibodies or using systemic immunosuppressants to prevent the degradation of this vital structural matrix (Source: Mayo Clinic Proceedings, 2021).

Other names

Intercellular substanceDesmosomal adhesion complexIntercellular matrix of the epidermisPrickle cell layer cement

Therapies do not typically target the cement substance itself but rather aim to suppress the production of autoantibodies (e.g., via B-cell depletion) or reduce the inflammatory response that leads to the destruction of these intercellular bonds.