Purification of pituitary and biosynthetic human growth hormone using monoclonal antibody immunoadsorbent

This report describes the purification of human growth hormone from crude pituitary extract and lysate of recombinant E. coli by an immunoadsorbent purification with monoclonal antibody coupled to solid phase. By a single-immunoaffinity chromatography step pure hGH can be obtained from either origin as revealed by SDS-PAGE followed by silver staining or immunoblotting. An additional ion-exchange chromatography step results in homogeneous 22 kDa hGH preparations. Furthermore, this method may be used for isolation of a pituitary hGH variant which has higher binding affinity for this monoclonal antibody than the major 22 kDa form. This study clearly illustrates the potential of monoclonal antibody immunoadsorbents for purification of different molecular forms of hGH.