Cardiac function, tissue perfusion, and vessel density were measured.
Results: HCX animals were significantly hypercholesterolemic compared with CX animals. Thrombogenic ratio was significantly higher in the HCX group than in the CX group, but prostacyclin and thromboxane synthase expression was similar in all tissues. Myocardial
perfusion was decreased in the HCX group compared with the CX group. Total oxidative stress, myeloperoxidase, and superoxide dismutase were increased in ischemic tissue compared with nonischemic tissues, but there was no diet-induced difference between groups. There was no difference in capillary or arteriolar density between groups. Left ventricular check details contractility was greater in the HCX group than in the CX group, but there was no significant difference in heart rate, mean arterial pressure, or left ventricular pressure.
Conclusions: Hypercholesterolemic patients using celecoxib may selleck inhibitor be at higher risk for thrombotic events than those with normal cholesterol, but the relationship between dyslipidemia, ischemia, and cyclooxygenase-2 inhibition is likely much more complicated than originally thought. (J Thorac Cardiovasc Surg 2011;142:675-81)”
“The balance between lipid accumulation and removal from cells in the artery wall is a key factor in atherogenesis. Smooth muscle cells (SMCs) are the main cell type in human intimal thickenings and some stages of atherosclerosis;
however, cholesterol homeostasis in these cells has received little attention when compared with intimal macrophages. In addition, it has been demonstrated that SMCs may change phenotype to express macrophage markers upon cholesterol loading, indicating not that a large portion of what are considered monocyte-derived human macrophages in human lesions may actually have originated as SMCs. We have recently reported low expression of the key regulator of cholesterol removal to apolipoprotein A-I to form high-density lipoprotein particles, the adenosine-triphosphate-binding cassette transporter A1, in cultured intima-phenotype epithelioid rat SMCs, as well
as reduced expression of adenosine-triphosphate-binding cassette transporter A1 in intimal as compared with medial SMCs in human coronary atheromas. These combined observations suggest that SMCs and SMC-derived macrophage-like cells may contribute a much larger amount of the excess cholesterol accumulated in the atherosclerotic intima than previously known. The aim of this review is to present the current state of knowledge of cholesterol homeostasis in arterial SMC and to frame questions requiring further study to understand the relative importance to SMCs in overall atheroma lipid metabolism. (Trends Cardiovasc Med 2010;20:96-102) (C) 2010, Elsevier Inc.”
“Estrogen is thought to be involved in the pathophysiology of depression and suicidal behaviors.