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Lipid-lowering agents in proteinuric diseases
Abstract:
Hyperlipidemia is common in patients with glomerular proteinuria. It may contribute to atherosclerotic complications and accelerate glomerular damage. Early trials of the fibric acid derivative clofibrate led to a myositis syndrome causing many nephrologists to abandon attempts at treatment of nephrotic hyperlipidemia. Recent trials with lipid-lowering medications have been successful without major side effects. The bile acid sequestrants colestipol and cholestyramine bind bile acids in the gut and deplete the hepatic cholesterol pool, thus inducing LDL hepatocyte receptors. Recent studies showed a reduction of total cholesterol of 8-20% and LDL cholesterol of 19-31% without significant changes in HDL cholesterol. Probucol has reduced total cholesterol 23-30% and LDL cholesterol 23-25% in nephrotic patients. Although HDL cholesterol was reduced, the LDL/HDL ratio remains favorably changed. The fibric acid derivative gemfibrozil inhibits adipose lipolysis and enhances lipoprotein lipase activity thus decreasing LDL synthesis and increasing its removal. It caused a large decrease in triglycerides with a 13-15% decrease in total and LDL cholesterol in a recent trial. HDL cholesterol increased 18%. The HMG-CoA reductase inhibitors inhibit the rate-limiting step in cholesterol biosynthesis hence inducing an increase in LDL receptors on hepatocytes. Trials have shown decreases of 18-36% in total cholesterol and 18-47% in LDL cholesterol, while HDL cholesterol was either increased or unchanged. The use of lipid-lowering agents of several classes has been effective in ameliorating the progression of glomerular damage in a number of different models of glomerulosclerosis. Nevertheless, so far in humans lipid lowering drugs have not been established to have an effect on either the degree of proteinuria or the progression of glomerulosclerosis.
Insights
Hyperlipidemia in kidney disease patients can worsen glomerular damage. Newer lipid-lowering drugs show promise in managing cholesterol levels without significant side effects.
Area of Science:
- Nephrology
- Cardiology
- Pharmacology
Background:
- Hyperlipidemia is prevalent in patients with glomerular proteinuria, potentially exacerbating atherosclerotic complications and kidney damage.
- Previous concerns regarding myositis with clofibrate led to hesitancy in treating nephrotic hyperlipidemia.
Purpose of the Study:
- To review the efficacy and safety of various lipid-lowering medications in patients with kidney disease and proteinuria.
- To assess the impact of these agents on lipid profiles and potential renal benefits.
Main Methods:
- Review of recent clinical trials and studies on lipid-lowering medications.
- Analysis of data on total cholesterol, LDL cholesterol, HDL cholesterol, and triglyceride levels.
- Evaluation of reported side effects and impact on proteinuria and glomerulosclerosis progression.
Main Results:
- Bile acid sequestrants (colestipol, cholestyramine) reduced total cholesterol by 8-20% and LDL by 19-31%.
- Probucol decreased total cholesterol by 23-30% and LDL by 23-25%, with a favorable LDL/HDL ratio despite HDL reduction.
- Gemfibrozil significantly lowered triglycerides and decreased total and LDL cholesterol by 13-15%, while increasing HDL by 18%.
- HMG-CoA reductase inhibitors reduced total cholesterol by 18-36% and LDL by 18-47%, with stable or increased HDL levels.
Conclusions:
- Several classes of lipid-lowering drugs are effective in improving lipid profiles in patients with kidney disease.
- While animal models suggest amelioration of glomerular damage, human trials have not yet established a clear benefit on proteinuria or glomerulosclerosis progression.