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First published online September 29, 2011

Prospective assessment of C4d deposits on circulating cells and renal tissues in lupus nephritis: a pilot study

Abstract

Complement activation plays a key role in the pathogenesis of lupus nephritis (LN), a severe complication of systemic lupus erythematosus (SLE). We prospectively evaluated 15 LN subjects and two control groups: 13 non-SLE renal subjects (control A) and 239 SLE subjects without LN (control B). All had C4d levels on circulating erythrocytes (E-C4d), reticulocytes (R-C4d) and platelets (P-C4d) measured by flow cytometry, while C4d deposition in renal tissue was semiquantitatively assessed in LN subjects and control A using immunoperoxidase staining.
Compared with control A, LN biopsies had higher glomerular-C4d scores (p = 0.003), which were associated with more frequent granular glomerular immunofluorescence staining and electron dense deposits (p < 0.001). Compared with control A and B groups, LN subjects had higher E-C4d (p = 0.002 and p = 0.005) and R-C4d levels (p = 0.002 and p = 0.008), respectively. LN subjects were more likely to have P-C4d compared with control A (p = 0.016). In LN, only E-C4d correlated with National Institutes of Health (NIH) activity index (r = 0.55, p = 0.04).
In conclusion, LN biopsies showed frequent glomerular-C4d staining associated with immune complex deposits. LN subjects had higher E-C4d and R-C4d levels compared with both control groups. E-C4d levels also correlated with NIH activity index. These findings suggest a potential role of C4d on circulating cells as a biomarker for lupus nephritis.

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Published In

Article first published online: September 29, 2011
Issue published: January 2012

Keywords

  1. C4d immunostain
  2. erythrocyte-bound C4d
  3. lupus nephritis
  4. platelet-bound C4d
  5. reticulocyte-bound C4d

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© The Author(s), 2011. Reprints and permissions: http://www.sagepub.co.uk/journalsPermissions.nav.
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PubMed: 21959138

Authors

Affiliations

I Batal*
Department of Pathology, University of Pittsburgh, USA
K Liang*
Division of Nephrology, University of Pittsburgh, USA
S Bastacky
Department of Pathology, University of Pittsburgh, USA
LP Kiss
Department of Pathology, University of Pittsburgh, USA
T McHale
Department of Pathology, University of Pittsburgh, USA
NL Wilson
Division of Rheumatology and Clinical Immunology, University of Pittsburgh, USA
Lupus Center of Excellence, West Penn Allegheny Health System, USA
B Paul
Division of Rheumatology and Clinical Immunology, University of Pittsburgh, USA
A Lertratanakul
Division of Rheumatology and Clinical Immunology, University of Pittsburgh, USA
JM Ahearn
Division of Rheumatology and Clinical Immunology, University of Pittsburgh, USA
Lupus Center of Excellence, West Penn Allegheny Health System, USA
SM Manzi
Division of Rheumatology and Clinical Immunology, University of Pittsburgh, USA
University of Pittsburgh Graduate School of Public Health, USA
AH Kao
Division of Rheumatology and Clinical Immunology, University of Pittsburgh, USA
Lupus Center of Excellence, West Penn Allegheny Health System, USA

Notes

Amy H Kao MD MPH, Lupus Center of Excellence, West Penn Allegheny Health System, 4800 Friendship Avenue, North Tower Suite 2600, Pittsburgh, PA 15224, USA Email: [email protected]
*
Both authors contributed similarly to this work.

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