Cercarial elastase (CE)

Cercarial elastase is the primary proteolytic enzyme utilized by Schistosoma cercariae, the infective larval stage of blood flukes, to breach the skin of a human host. Secreted from the parasite's acetabular glands in response to skin lipids, this serine protease facilitates invasion by degrading essential structural proteins in the host epidermis and dermis, such as elastin, laminin, and keratin [1, 2, 6]. By hydrolyzing these components of the basement membrane and extracellular matrix, the enzyme enables the cercariae to migrate from contaminated water into the host's circulatory system [11, 15]. The enzyme is a critical target for preventative medicine, as its inhibition effectively blocks the initial stage of schistosome infection [9]. Pharmacological research has identified specific serine protease inhibitors like Elafin and Z-AAPF-CMK, as well as topical agents like lapachol, that can neutralize the enzyme's activity and prevent penetration [2, 5, 9]. Furthermore, cercarial elastase is an important candidate for vaccine development, aimed at inducing an immune response that neutralizes the enzyme upon larval contact with the skin [10, 13].

Other names

Schistosoma cercarial elastaseCercarial serine proteaseAcetabular gland proteaseSmCESjCE

Inhibition of the proteolytic degradation of host skin components (e.g., elastin, laminin, keratin) to prevent the entry and migration of schistosome larvae into host tissues.