Nephrology Dialysis Transplantation, Vol 14, Issue 5 1234-1237, Copyright © 1999 by Oxford University Press
P Furness, L Hall, J Shaw and J Pringle
Background. Nephril recently has been identified as a
putative adhesion molecule, expressed in the glomerulus, in which mutations
cause congenital nephrotic syndrome of Finnish type. We sought to determine
whether expression of nephrin is altered in human glomeruli in patients
with acquired nephrotic syndrome. Methods. We
performed PCR amplification of nephrin cDNA, using cDNA previously prepared
from single human glomeruli plucked fresh from the surface of human renal
biopsies. We had available four cases of nephrotic syndrome (one
membranous, three minimal change) and six normal controls. PCR product
quantitation was by gel densitometry, confirmed by enzyme-linked
immunosorbent assay using a specific oligonucleotide probe. Results were
corrected for reaction efficiency and glomerular cellularity by expression
as a ratio to levels of the 'housekeeping gene' glyceraldehyde phosphate
dehydrogenase. Results. Glomerular levels of nephrin
mRNA are significantly decreased in cases of minimal change nephrotic
syndrome. An apparent reduction was also seen in the single case of
membranous nephropathy which was available for study.
Conclusions. Abnormalities of nephrin expression
appear to be associated with acquired as well as congenital causes of human
nephrotic syndrome. Keywords: adhesion; glomerulus;
nephrin; nephrotic syndrome; slit diaphragm
PRELIMINARY REPORTS
Glomerular expression of nephrin is decreased in acquired human nephrotic syndrome
Department of Pathology, Leicester General Hospital, Gwendolen Road, Leicester LE5 4PW, UK; Corresponding author
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