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2014 ; 10
(5
): 530-42
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Detailed localization of augmented angiotensinogen mRNA and protein in proximal
tubule segments of diabetic kidneys in rats and humans
#MMPMID24910532
Kamiyama M
; Garner MK
; Farragut KM
; Sofue T
; Hara T
; Morikawa T
; Konishi Y
; Imanishi M
; Nishiyama A
; Kobori H
Int J Biol Sci
2014[]; 10
(5
): 530-42
PMID24910532
show ga
In the intrarenal renin-angiotensin system, angiotensinogen levels are well known
to be increased in diabetes, and these enhanced intrarenal angiotensinogen levels
may initiate the development and accelerate the progression of diabetic
nephropathy. However, the specific localization of the augmented angiotensinogen
in proximal tubule segments in diabetes is still unknown. We investigated the
detailed localization of angiotensinogen in 3 proximal tubule segments in the
diabetic Otsuka Long-Evans Tokushima fatty (OLETF) rats and the control
Long-Evans Tokushima Otsuka (LETO) rats. We also prepared OLETF rats treated with
angiotensin II type 1 receptor blocker, olmesartan or with a combination of
vasodilator agents. Moreover, biopsied samples of human kidney cortex were used
to confirm the results of animal studies. We examined the co-localization of
angiotensinogen with segment-specific markers by double staining using
fluorescence in situ hybridization and/or immunofluorescence. Angiotensinogen
mRNA expression was barely detectable in segment 1. In segment 3, the area of
angiotensinogen mRNA expression was augmented in the OLETF rats compared with the
LETO rats. Angiotensinogen protein expression areas in segments 1 and 3 were also
increased in the OLETF rats compared with the LETO rats. Chronic treatment with
olmesartan ameliorated these areas of augmented angiotensinogen expression.
Biopsied human kidney samples showed similar results. These data suggest that the
augmented angiotensinogen mRNA levels in segment 3 and angiotensinogen protein
levels in segments 1 and 3 may contribute to the progression of diabetic
nephropathy.
|Analysis of Variance
[MESH]
|Angiotensin II Type 1 Receptor Blockers/pharmacology
[MESH]