Syntaxin 4 （STX4） is a member of the syntaxin/epimorphin family of proteins. The Syntaxin family is cellular receptors for transport vesicles which participate in exocytosis in neutrophils. Syntaxin 4 is vital for normal insulin-stimulated glucose uptake in skeletal muscle and decline in STX4 protein levels lead to reduction of whole-body insulin-stimulated glucose metabolism. STX4 is expressed in neutrophils and neutrophil-differentiated HL-60 cells. The STX4 expression in neutrophils increases with differentiation.
