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2017 ; 18
(1
): 280
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Local CD34-positive capillaries decrease in mouse models of kidney disease
associating with the severity of glomerular and tubulointerstitial lesions
#MMPMID28870174
Masum MA
; Ichii O
; Elewa YHA
; Nakamura T
; Kon Y
BMC Nephrol
2017[Sep]; 18
(1
): 280
PMID28870174
show ga
BACKGROUND: The renal vasculature plays important roles in both homeostasis and
pathology. In this study, we examined pathological changes in the renal
microvascular in mouse models of kidney diseases. METHODS: Glomerular lesions
(GLs) in autoimmune disease-prone male BXSB/MpJ-Yaa (Yaa) mice and
tubulointerstitial lesions (TILs) in male C57BL/6 mice subjected to unilateral
ureteral obstruction (UUO) for 7 days were studied. Collected kidneys were
examined using histopathological techniques. A nonparametric Mann-Whitney U test
(P < 0.05) was performed to compare healthy controls and the experimental mice.
The Kruskal-Wallis test was used to compare three or more groups, and multiple
comparisons were performed using Scheffe's method when significant differences
were observed (P < 0.05). RESULTS: Yaa mice developed severe autoimmune
glomerulonephritis, and the number of CD34(+) glomerular capillaries decreased
significantly in GLs compared to that in control mice. However, UUO-treated mice
showed severe TILs only, and CD34(+) tubulointerstitial capillaries were
decreased significantly in TILs with the progression of tubulointerstitial
fibrosis compared to those in untreated control kidneys. Infiltrations of
B-cells, T-cells, and macrophages increased significantly in the respective
lesions of both disease models (P < 0.05). In observations of vascular corrosion
casts by scanning electron microscopy and of microfil rubber-perfused thick
kidney sections by fluorescence microscopy, segmental absences of capillaries
were observed in the GLs and TILs of Yaa and UUO-treated mice, respectively.
Further, transmission electron microscopy revealed capillary endothelial injury
in the respective lesions of both models. The numbers of CD34(+) glomerular and
tubulointerstitial capillaries were negatively correlated with all examined
parameters in GLs (P < 0.05) and TILs (P < 0.01), respectively. CONCLUSIONS: From
the analysis of mouse models, we identified inverse pathological correlations
between the number of local capillaries in GLs and TILs and the severity of
kidney diseases.