臨牀透析 Vol.14 No.11(3-1)


特集名 腎不全における高脂血症の病態と治療
題名 トピックス (1) 腎不全とsmall dense LDL
発刊年月 1998年 09月
著者 平野 勉 昭和大学医学部第一内科
【 要旨 】 LDLが小型化するとその催動脈硬化性がさらに高まる.小型LDLは酸化されやすく,酸化LDLは強い親和性でメサンギウム細胞に取り込まれるため腎糸球体硬化症の病因となりうる.TGはLDLサイズの強力な規定因子である.腎疾患患者のLDLは小型化するが,TG正常例での小型化はまれである.透析患者のLDLサイズもTG値に依存する.糖尿病性腎症ではLDLは著明に小型化し,これは正脂血症例でも認められる.糖尿病性腎症では食後高脂血症が存在し,空腹時のTG値とは独立してLDLサイズを規定している.腎機能障害は小型LDLに直接関与しないがTG値は腎疾患で増加しやすく,高TG血症を示す症例では小型LDLの出現頻度が高いため血清TG値は腎疾患でもっと注目されてよい.
Theme Pathophysiology and Treatment of Deranged Lipid Metabolism in Chronic Renal Failure
Title Small dense LDL in patients with renal failure
Author Tsutomu Hirano First Department of Internal Medicine, Showa University School of Medicine
[ Summary ] Small low-density lipoprotein (LDL) is associated with a high incidence of coronary heart disease and may play a role in the progression of glomerulosclerosis. It is well known that a strong inverse correlation exists between LDL size and plasma triglyceride (TG) levels. LDL particles become smaller in patients with kidney disease and this is closely associated with plasma TG concentrations. Patients treated with hemodialysis do not exhibit this small-dense LDL unless the subjects are hypertriglyceridemic. LDL size is substantially smaller in patients with diabetic nephropathy, even when hypertriglyceridemic subjects are excluded. NIDDM patients receiving nephropathy exhibit marked postprandial lipemia, which is associated with the reduction LDL size, independent of fasting TG levels. We should pay more attention to plasma TG levels in patients with kidney disease, because LDL size is strongly regulated by its concentration.
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