Neutrophil specific 33 kDa protein: Its Ca²⁺‐ and phospholipid‐dependent intracellular translocation

Abstract

A 33 kDa protein from neutrophils has been shown to associate reversibly with phosphatidylserine containing liposomes in a Ca2+-dependent manner. The protein was purified from guinea pig neutrophils. Immunoblotting and cytochemical studies with polyclonal and monoclonal antibodies to the protein revealed that the protein is commonly distributed in neutrophil cytoplasm of different animal species. The protein was translocated to the plasma membrane by treatment with stimuli. Thus the 33 kDa protein is neutrophil specific and may be involved in transmembrane signaling.