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2017 ; 7
(1
): 11473
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Structured illumination microscopy and automatized image processing as a rapid
diagnostic tool for podocyte effacement
#MMPMID28904359
Siegerist F
; Ribback S
; Dombrowski F
; Amann K
; Zimmermann U
; Endlich K
; Endlich N
Sci Rep
2017[Sep]; 7
(1
): 11473
PMID28904359
show ga
The morphology of podocyte foot processes is obligatory for renal function. Here
we describe a method for the superresolution-visualization of podocyte foot
processes using structured illumination microscopy of the slit diaphragm, which
before has only been achieved by electron microscopy. As a proof of principle, we
measured a mean foot process width of 0.249?±?0.068?µm in healthy kidneys and a
significant higher mean foot process width of 0.675?±?0.256?µm in minimal change
disease patients indicating effacement of foot processes. We then hypothesized
that the slit length per glomerular capillary surface area (slit diaphragm
density) could be used as an equivalent for the diagnosis of effacement. Using
custom-made software we measured a mean value of 3.10?±?0.27?µm(-1) in healthy
subjects and 1.83?±?0.49?µm(-1) in the minimal change disease patients. As foot
process width was highly correlated with slit diaphragm density (R(2)?=?0.91), we
concluded that our approach is a valid method for the diagnosis of foot process
effacement. In summary, we present a new technique to quantify podocyte damage,
which combines superresolution microscopy with automatized image processing. Due
to its diverse advantages, we propose this technique to be included into routine
diagnostics of glomerular histopathology.