Distribution of IgM and IgG antibodies to oxidized LDL in immune complexes isolated from patients with type 1 diabetes and its relationship with nephropathy

Gabriel Virella, Rickey E. Carter, Antonio Saad, Edward G. Crosswell, B. Andrew Game, Maria F. Lopes-Virella

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Modified lipoproteins are immunogenic and play a key pathogenic role in vascular disease. Antibodies to oxidized LDL (oxLDL) are mostly of the pro-inflammatory IgG1 and IgG3 isotypes. We measured IgG and IgM oxLDL antibodies in immune complexes (IC) isolated from 36 patients with type 1 diabetes using a nested case control design. IgG antibodies predominated over IgM antibodies by an 8:1 ratio. IgG antibody concentrations were higher in the nephropathy cases compared to controls (p = 0.09), but no significant difference was observed because of two patients included in the study who had end-stage renal disease (creatinine > 5 mg/dL and glomerular filtration rate (GFR) less than 17 mL/min). After eliminating these patients from the analysis, significant positive associations of IgG antibody concentration with serum creatinine and albumin excretion rate were observed. Similarly, a negative correlation with estimated glomerular filtration rate was observed in this subsample of 34 patients. Differences in IgM antibody concentrations by nephropathy classification were not supported by the data. In conclusion, the predominance of pro-inflammatory IgG oxLDL antibodies is associated with existence of diabetic nephropathy, and a protective role of IgM antibodies could not be demonstrated.

Original languageEnglish (US)
Pages (from-to)394-400
Number of pages7
JournalClinical Immunology
Volume127
Issue number3
DOIs
StatePublished - Jun 1 2008
Externally publishedYes

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Keywords

  • Autoimmunity
  • Diabetes
  • Immune complexes
  • Nephropathy
  • Oxidized LDL antibodies

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Medicine(all)

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