Multiple forms of immunoreactive dynorphin in human pituitary and pheochromocytoma

Multiple forms of immunoreactive dynorphin (I-Dy) in human pituitary and pheochromocytoma were examined utilizing gel filtration and high performance liquid chromatography (HPLC). Gel filtration of I-Dy from these tissues revealed the major component in the position of Dy(1-17) and other minor components with large molecular weight forms. HPLC profile of this major component from gel filtration showed a large peak corresponding to the position of Dy(1-17) and small peaks corresponding to the positions of Dy (1-13), (1-12) and other unknown peptides. These results strongly suggest the presence of Dy(1-17) as the major component, and Dy (1-13), (1-12) or other unknown peptides as the minor components in these human tissues.