Prion protein expression in bovine podocytes and extraglomerular mesangial cells.
The cellular form of the prion protein (PrP(c)) is thought to be a substrate for an abnormal isoform of the prion protein (PrP(sc)). One emerging hypothesis is that the proposed conversion phenomenon takes place at the site at which the infectious agent meets PrP(c). PrP(c) is abundant in the central nervous system, but little is known about the cell-type-specific distribution of PrP(c) in non-neuronal tissues of cattle. We have studied whether PrP(c), a protein found predominantly in neurons, also exists in bovine podocytes, since neurons and podocytes share a large number of similarities. We have therefore examined the expression of PrP(c) by immunohistochemistry, reverse transcription/polymerase chain reaction and enzyme-linked immunosorbent analysis. Immunostained serial sections and specific antibodies against PrP(c) have revealed that PrP(c) is selectively localized in podocytes and is particularly strongly expressed in extraglomerular mesangial cells but not in endothelial or intraglomerular mesangial cells. The selective expression of PrP(c) in podocytes is of special importance, as it suggests that these cells represent possible targets for peripheral infection with prions and demonstrates that PrP(c) can be added to the list of neuronal factors expressed in mammalian podocytes.
Institute of Anatomy and Physiology, University of Hohenheim, Fruhwirthstrasse 35, 70593 Stuttgart, Germany. amselgru@uni-hohenheim.de
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Amselgruber
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Steffl
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Didier
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Märtlbauer
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Pfaff
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Büttner
D000818:Animals; D002417:Cattle; D004797:Enzyme-Linked Immunosorbent Assay; D007150:Immunohistochemistry; D007678:Kidney Glomerulus / Q000166:cytology / Q000378:metabolism*; D050527:Mesangial Cells / Q000166:cytology / Q000378:metabolism*; D050199:Podocytes / Q000166:cytology / Q000378:metabolism*; D018621:PrPC Proteins / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction
D018621:PrPC Proteins