Article

C4d/CD34 double-immunofluorescence staining of renal allograft biopsies for assessing peritubular capillary C4d positivity

Department of Pathology, University of California, San Francisco, San Francisco, CA, USA.
Modern Pathology (Impact Factor: 6.36). 03/2012; 25(3):434-8. DOI: 10.1038/modpathol.2011.168
Source: PubMed

ABSTRACT Immunofluorescence detection of the complement split product C4d along peritubular capillaries in renal allograft biopsies is the mainstay for the diagnosis of antibody-mediated rejection. The extent of peritubular capillary C4d positivity may have significant clinical ramifications; however, peritubular capillary density in the renal cortex is often difficult to assess with single-channel immunofluorescence. In this study, we report a C4d/CD34 double-immunofluorescence staining protocol for renal allograft frozen sections that allows rapid and sensitive detection of C4d positivity, as well as improved accuracy in estimating the C4d-positive fraction of peritubular capillaries. In addition, this method aids in determining whether C4d-positive structures correspond to peritubular capillaries or whether they represent common mimics of peritubular capillaries such as tubular basement membranes. C4d/CD34 double immunofluorescence provides rapid, convenient, and low-cost implementation for laboratories currently utilizing single-channel C4d immunofluorescence.

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