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



Pubmed ID




Scopus ID

2-s2.0-13944252905   22 Citations


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


Nicole L. Lohr MD, PhD Associate Professor in the Medicine department at Medical College of Wisconsin
Dorothee Weihrauch DVM, PhD Professor in the Anesthesiology department at Medical College of Wisconsin

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

Cell Division
Cell Movement
Collateral Circulation
Coronary Circulation
Coronary Disease
Coronary Vessels
Neovascularization, Physiologic
jenkins-FCD Prod-411 e00897e83867fcfa48419861683711f8d99adb75