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Protamine inhibits coronary collateral development in a canine model of repetitive coronary occlusion. Am J Physiol 1995 Feb;268(2 Pt 2):H720-8

Date

02/01/1995

Pubmed ID

7532374

DOI

10.1152/ajpheart.1995.268.2.H720

Abstract

Protamine has been demonstrated to inhibit angiogenesis in vitro and in vivo; however, its effect on coronary collateral development has not been examined. The present investigation tested the hypothesis that subcutaneously administered protamine inhibits canine coronary collateral development in response to chronic myocardial ischemia. Dogs underwent daily, repetitive, 2-min, left anterior descending coronary artery (LAD) occlusions for 22 consecutive days. Regional myocardial blood flow (radioactive microspheres), LAD segment shortening, and coronary flow debt repayment were measured in saline-treated (n = 7) and protamine-treated (n = 6) dogs on days 1, 8, 15, and 22. Coronary collateral development in saline-treated dogs was demonstrated by time-dependent significant (P < 0.05) increases in collateral blood flow to ischemic myocardium [day 1 0.10 +/- 0.01 vs. day 22 0.88 +/- 0.05 (SE) ml.min-1.g-1], progressive normalization of myocardial contractile function during LAD occlusion, and successive reduction in flow debt repayment. In contrast, protamine treatment significantly attenuated, increases in collateral perfusion (day 1 0.13 +/- 0.02 vs. day 22 0.36 +/- 0.03 ml.min-1.g-1). Regional contractile dysfunction and postocclusive reactive hyperemic responses were sustained over time in protamine-treated compared with saline-treated dogs. The results demonstrate that protamine inhibits coronary collateral development in response to chronic myocardial ischemia.

Author List

Kersten JR, Pagel PS, Warltier DC

Author

Paul S. Pagel MD, PhD Professor in the Anesthesiology department at Medical College of Wisconsin




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

Animals
Collateral Circulation
Coronary Circulation
Coronary Disease
Dogs
Hemodynamics
Hyperemia
Myocardial Contraction
Neovascularization, Pathologic
Protamines
Recurrence
jenkins-FCD Prod-387 b0ced2662056320369de4e5cd5f21c218c03feb3