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Nephrol Dial Transplant. 2012 Apr;27(4):1416-23. doi: 10.1093/ndt/gfr454. Epub 2011 Aug 19.

High levels of oxidized LDL in circulating immune complexes are associated with increased odds of developing abnormal albuminuria in Type 1 diabetes.

Author information

  • 1Department of Medicine and Laboratory Services, Medical University of South Carolina and Ralph H. Johnson VA Medical Center, Charleston, SC, USA. virellam@musc.edu

Abstract

BACKGROUND:

Modified low-density lipoprotein (LDL) immune complexes (IC) have proinflammatory properties and play a role in albuminuria development.

METHODS:

We measured oxidized LDL (oxLDL) and advanced glycation end-product (AGE)-LDL in IC isolated from sera of Type 1 diabetic subjects followed for 14-20 years and studied their association with abnormal albuminuria. Patients with albumin excretion rates (AER)<40 mg/24 h at baseline and follow-up (n=302) were deemed resistant to developing abnormal albuminuria. Patients with AER<40 mg/24 h at baseline whose AER levels progressed to >40 mg/24 h were considered prone to abnormal albuminuria (n=185), those who progress to AER>299 mg/24 h were considered as having macroalbuminuria (n=57). The odds of developing abnormal albuminuria were estimated by logistic regression based on natural log-transformed levels of oxLDL and AGE-LDL in IC and stratified by baseline AER decile.

RESULTS:

OxLDL and AGE-LDL were significantly higher in IC isolated from patients progressing to abnormal albuminuria. In unadjusted conditional logistic analysis, an increase of 1 SD in oxLDL and AGE-LDL levels in IC significantly increased the odds ratio (OR) for development of macroalbuminuria, respectively, by a factor of 2.5 and 1.8 (P<0.001, P=0.008). The increased odds of developing macroalbuminuria remained significant when adjusted for treatment group, diabetes duration, retinopathy, baseline hemoglobin A1c and LDL (OR=2.5 and 1.8, respectively, P<0.01).

CONCLUSION:

Higher levels of oxLDL and AGE-LDL in circulating IC were associated with increased odds to develop abnormal albuminuria.

PMID:
21856760
[PubMed - indexed for MEDLINE]
PMCID:
PMC3471550
Free PMC Article

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