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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Histochem+Cytochem
2016 ; 64
(9
): 546-55
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The Use of Cytochrome C Oxidase Enzyme Activity and Immunohistochemistry in
Defining Mitochondrial Injury in Kidney Disease
#MMPMID27578326
Zsengellér ZK
; Rosen S
J Histochem Cytochem
2016[Sep]; 64
(9
): 546-55
PMID27578326
show ga
The renal biopsy is a dynamic way of looking at renal disease, and tubular
elements are an important part of this analysis. The mitochondria in 20 renal
biopsies were examined by immunohistochemical (electron transport chain enzyme:
cytochrome C oxidase IV [COX IV]) and enzyme histochemical methods (COX), both by
light and electron microscopy. The distal convoluted tubules and thick ascending
limbs showed the greatest intensity in the COX immunostains and enzyme activity
in controls. The degree of mitochondrial COX protein and enzyme activity
diminished as the tubules became atrophic. With proximal hypertrophic changes,
there was great variation in both COX activity and protein expression. In
contrast, in three cases of systemic lupus erythematosus, biopsied for high-grade
proteinuria, the activity was consistently upregulated, whereas protein
expression remained normal. These unexpected findings of heterogeneous
upregulation in hypertrophy and the dyssynchrony of protein expression and
activity may indicate mitochondrial dysregulation. Functional electron microscopy
showed COX activity delineated by the intense mitochondrial staining in normal or
hypertrophic proximal tubules. With atrophic changes, residual small mitochondria
with diminished activity could be seen. With mitochondrial size abnormalities
(enlargement and irregularity, adefovir toxicity), activity persisted. In the
renal biopsy, mitochondrial analysis is feasible utilizing immunohistochemical
and enzyme histochemical techniques.