[Introductory review of diagnostic approach to arteriosclerosis].

Investigation of the pathogenesis of arteriosclerosis and/or atherosclerosis has been progressed using molecular biology. New concepts have been developed and, receptors and substances have been found clinically and experimentally, which have led us to create new methods of evaluating or diagnosing the grade of atherosclerosis lesion. Dealing with the new concepts or knowledge in this symposium, this introductory paper describes an overview of pathogenesis of atherosclerosis, from which the new methods of evaluating or diagnosing lesion has been exploited. The injury to the endothelium leads to endothelial cell dysfunction, which initiates the acceleration of LDL oxidation and increases adherence of monocytes, macrophages and T lymphocytes, migrating subendothelially and causing large foam cells to develop because of lipid accumulation. Macrophages and platelets release many growth factors, which accelerate the growth of vascular smooth muscle cells, forming fibrous plaque. In these pathogenic processes of atherosclerosis, angiotensin II participates in releasing growth factor for cell proliferation and hepatocyte growth factor (HGF) participates in revascularization of the sclerotic lesion, suggesting a candidate marker for atherosclerosis. Hyperlipidemia and hypercoagulation are the major factors in advanced atherosclerosis. Using new methods to evaluate or diagnose lesions, further therapy and prevention for atherosclerosis will progress in future.