V Vetvicka1, J Vetvickova, M Fusek. 1. Department of Pathology, School of Medicine, University of Louisville, Louisville, Kentucky 40292, USA. Vasek@louisville.edu
Abstract
BACKGROUND: Enzymatically inactive procathepsin D secreted from cancer cells has been confirmed to play a role in breast cancer development. We focused on prostate cancer and the role of activation peptide in mitogenic activity. METHODS: Synthetic peptides and monoclonal antibodies raised against individual fragments of activation peptide were employed. Cell proliferation was measured by MTT (3-[4,5-dimethylthiatol-2-yl]-2,5-diphenyl tetrazolium bromide) assay or by in vivo growth in nude mice. RESULTS: We demonstrated that the growth factor activity of activation peptide is localized in amino-acid region 27-44. In addition, both anti-activation peptide and anti-27-44 peptide antibodies administered in vivo inhibited the growth of human prostate tumors in mice. CONCLUSIONS: Based on these data, we hypothesize that the interaction of procathepsin D activation peptide with an unknown receptor is mediated by amino-acid sequence 27-44. This interaction leads in certain types of tumor to a proliferation and higher motility. Blocking of this interaction by antibodies or antagonists might be a valuable tool in prostate cancer inhibition. Copyright 2000 Wiley-Liss, Inc.
BACKGROUND: Enzymatically inactive procathepsin D secreted from cancer cells has been confirmed to play a role in breast cancer development. We focused on prostate cancer and the role of activation peptide in mitogenic activity. METHODS: Synthetic peptides and monoclonal antibodies raised against individual fragments of activation peptide were employed. Cell proliferation was measured by MTT (3-[4,5-dimethylthiatol-2-yl]-2,5-diphenyl tetrazolium bromide) assay or by in vivo growth in nude mice. RESULTS: We demonstrated that the growth factor activity of activation peptide is localized in amino-acid region 27-44. In addition, both anti-activation peptide and anti-27-44 peptide antibodies administered in vivo inhibited the growth of humanprostate tumors in mice. CONCLUSIONS: Based on these data, we hypothesize that the interaction of procathepsin D activation peptide with an unknown receptor is mediated by amino-acid sequence 27-44. This interaction leads in certain types of tumor to a proliferation and higher motility. Blocking of this interaction by antibodies or antagonists might be a valuable tool in prostate cancer inhibition. Copyright 2000 Wiley-Liss, Inc.
Authors: N S Vasudev; S Sim; D A Cairns; R E Ferguson; R A Craven; A Stanley; J Cartledge; D Thompson; P J Selby; R E Banks Journal: Br J Cancer Date: 2009-10-06 Impact factor: 7.640