Abstract
Thrombin is clearly a key trigger of thrombosis, the proximal cause of most morbidity and mortality in atherosclerotic cardiovascular disease. Might thrombin also contribute to longer-term, structural changes in the arterial wall that promote narrowing and clotting? A study in this issue of the JCI argues that it can. Aihara et al. report that haploinsufficiency of heparin cofactor II, a glycosaminoglycan-dependent thrombin inhibitor, exacerbates injury- or hyperlipidemia-induced arterial lesion formation in mice, possibly by excessive thrombin signaling through protease-activated receptors (see the related article beginning on page 1514).
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