Faculty Collaboration Database

Haptoglobin expression and activity during coronary collateralization. Am J Physiol Heart Circ Physiol 2005 Mar;288(3):H1389-95

Date

11/20/2004

Pubmed ID

15550518

DOI

10.1152/ajpheart.00938.2004

Scopus ID

2-s2.0-13944252905 (requires institutional sign-in at Scopus site)   25 Citations

Abstract

Coronary collateral development relies on the coordinated secretion of growth factors. However, alone they are insufficient for permanent collateral growth. We utilized proteomics to identify other important proteins in the extracellular environment that could facilitate collateralization. Chronically instrumented dogs developed coronary collaterals by the repetitive occlusion method. Subendocardial (0.19 +/- 0.04, 0.27 +/- 0.06, 0.48 +/- 0.10, and 0.81 +/- 0.11 ml x min(-1) x g(-1) on days 1, 7, 14, and 21, respectively) and subepicardial (0.14 +/- 0.01, 0.36 +/- 0.06, 0.51 +/- 0.07, and 0.71 +/- 0.08 ml x min(-1) x g(-1) on days 1, 7, 14, and 21, respectively) blood flow increased in animals subjected to repetitive occlusion. Sham animals exhibited no changes in blood flow. Myocardial interstitial fluid (MIF) from both groups was analyzed by two-dimensional electrophoresis with matrix-assisted laser desorption/ionization time-of-flight identification. The acute-phase protein haptoglobin was identified in the group subjected to repetitive occlusion. ELISA of MIF showed haptoglobin to be elevated at all time points of collateral development compared with sham, with maximal production on day 7. Purified haptoglobin dose dependently stimulated endothelial cells to form tubes and vascular smooth muscle cells to migrate. Purified haptoglobin did not stimulate proliferation of either cell type. The relative contribution of haptoglobin to the chemotactic properties of MIF was tested using a neutralizing antibody. Neutralized MIF could not stimulate smooth muscle cells to migrate at any time during collateral development. Endothelial cell tube formation was inhibited after the midpoint of collateralization. Therefore, the acute-phase protein haptoglobin plays a critical role during coronary collateralization.

Author List

Lohr NL, Warltier DC, Chilian WM, Weihrauch D

Author

Dorothee Weihrauch DVM, PhD Research Scientist II in the Anesthesiology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Animals
Cell Division
Cell Movement
Collateral Circulation
Coronary Circulation
Coronary Disease
Coronary Vessels
Dogs
Haptoglobins
Neovascularization, Physiologic
Proteomics