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Changed composition of high-density lipoprotein subclasses HDL2 and HDL3 after renal transplantation
1Department of Experimental Organ Transplantation, University Hospital Charité, Berlin, German Democratic Republic.
Insights
Renal transplant recipients showed normal HDL cholesterol levels post-transplant, unlike hemodialysis patients. Successful transplantation improves HDL metabolism, potentially reducing atherosclerosis risk.
Area of Science:
- Nephrology
- Cardiovascular Science
- Biochemistry
Background:
- High-density lipoprotein (HDL) cholesterol plays a crucial role in reverse cholesterol transport.
- Dyslipidemia, including altered HDL levels, is common in patients with chronic kidney disease and after renal transplantation.
- Understanding HDL subclass metabolism is important for assessing cardiovascular risk.
Purpose of the Study:
- To compare HDL cholesterol concentrations and its subclasses (HDL2, HDL3) in renal transplant recipients and hemodialysis patients versus healthy controls.
- To evaluate the impact of renal transplantation on HDL metabolism.
Main Methods:
- Lipid profiles, specifically HDL cholesterol and its subclasses (HDL2, HDL3), were measured.
- Subclasses were separated using a precipitation method with polyethylene glycol 6000 and dextran sulphate.
- Study groups included male renal transplant recipients (n=333), male hemodialysis patients (n=36), and healthy male controls (n=43).
Main Results:
- Hemodialysis patients exhibited reduced total HDL cholesterol and both HDL2 and HDL3 subclasses.
- Renal transplant recipients had normal total HDL cholesterol and HDL2 subclass levels.
- HDL3 subclass remained reduced in renal transplant recipients, similar to hemodialysis patients.
Conclusions:
- Successful renal transplantation normalizes total HDL cholesterol and HDL2 levels, indicating improved lipid metabolism.
- Persistent reduction in HDL3 suggests ongoing metabolic alterations post-transplantation.
- Renal transplantation demonstrates a beneficial effect on HDL metabolism, potentially mitigating atherosclerosis development.
Abstract:
The concentrations of cholesterol in the high density lipoprotein (HDL) fraction and the HDL2 and HDL3 subclasses were compared in 333 male renal transplant recipients, 36 male patients on maintenance hemodialysis, and 43 healthy men. The subclasses were separated by a precipitation method using polyethylene glycol 6000 and dextran sulphate. In hemodialyzed patients, total HDL cholesterol and both subclasses were reduced. In renal transplant recipients, both total HDL cholesterol and HDL2 were normal, whereas HDL3 remained reduced, analogous to hemodialyzed patients. It can be concluded that a successful renal transplantation has a beneficial effect on HDL metabolism and thus on the development of atherosclerosis.