Cytotoxin and helminthotoxin. Also induces non-cytolytic histamine release from human basophils. Involved in antiparasitic defense mechanisms and immune hypersensitivity reactions. The proform acts as a proteinase inhibitor, reducing the activity of PAPPA.
High levels of the proform in placenta and pregnancy serum; in placenta, localized to X cells of septa and anchoring villi. Lower levels in a variety of other tissues including kidney, myometrium, endometrium, ovaries, breast, prostate, bone marrow and colon.
Contains 1 C-type lectin domain.
Levels of the proform increase in serum and placenta during pregnancy.
Cytoplasmic vesicle > secretory vesicle. The proform is secreted. The mature protein is found in the matrix of the eosinophil's large specific granule and Secreted. The proform is secreted.