[The role of hypertension as a risk factor of atherosclerosis].
Epidemiologic studies have demonstrated hypertension is one of the risk factors of atherosclerosis, but the underlying mechanism is complex and still controversial. Salt-sensitivity is an important characteristic demonstrated in a subgroup of hypertension, since the factors relating to salt-sensitivity also influence smooth muscle hypertrophy and proliferation which are essential processes of atherosclerosis. Insulin resistance is also involved in the causal relationship between hypertension and atherosclerosis, because accumulating data indicate a central role of insulin resistance in patients with hypertension, glucose-intolerance and dyslipidemia. Vasoacting substances give direct effects on not only the tension but also the growth of smooth muscle cells, namely vasodilators, such as nitric oxide and atrial natriuretic peptides inhibit the proliferation of smooth muscle cells. On the other hand, vasoconstrictors such as angiotensin II, vasopressin and endothelin promote the proliferation of smooth muscle cells. The factors which influence both tension and proliferation of smooth muscle cells may play a central role in the relationship between hypertension and atherosclerosis.
Kobayashi
M
M
Department of Clinical Laboratory, Akita University School of Medicine.
Uesugi
S
S
D001161:Arteriosclerosis / Q000209:etiology*; D006801:Humans; D006973:Hypertension / Q000150:complications* / Q000209:etiology; D012307:Risk Factors