Abstract
Helodermin is a biologically active peptide isolated from the venom of the Gila monster lizard ( Heloderma suspectum) whose structure is related to that of vasoactive intestinal peptide and secretin. Using a specific radioimmunoassay based on antisera prepared by immunizing rabbits with natural helodermin, we demonstrated the presence of helodermin-like material in mammalian salivary glands, including parotid, submaxillary and sublingual glands from rat and dog, and parotid and submaxillary glands from man. All helodermin-like materials had an apparent molecular mass of 4–12 kDa. Dog saliva, collected after pilocarpine stimulation, revealed similar immunoreactivity with a major component around 6 kDa.
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