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2016 ; 118
(2
): 183-93
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Antioxidant diet and sex interact to regulate NOS isoform expression and
glomerular mesangium proliferation in Zucker diabetic rat kidney
#MMPMID26797190
Slyvka Y
; Malgor R
; Inman SR
; Ding J
; Heh V
; Nowak FV
Acta Histochem
2016[Mar]; 118
(2
): 183-93
PMID26797190
show ga
Oxidative stress contributes substantially to the pathophysiology of diabetic
nephropathy (DN). Consumption of an antioxidant-fortified (AO) diet from an early
age prevents or delays later development of DN in the Zucker rat female with type
2 diabetes. We hypothesize this is due to effects on mesangial matrix and renal
nitric oxide synthase (NOS) distribution and to sex-specific differences in NOS
responses in the diabetic kidney. Total glomerular tuft area (GTA) and
PAS-positive tuft area (PTA), endothelial (e), neuronal (n) and inducible (i) NOS
were quantified in males and females on AO or regular (REG) diet at 6 and 20
weeks of age. eNOS was observed in glomeruli and tubules. nNOS predominantly
localized to tubular epithelium in both cortex and medulla. iNOS was expressed in
proximal and distal tubules and collecting ducts. Sex, diabetes duration and AO
diet affected the distribution of the three isoforms. GTA and PTA increased with
duration of hyperglycemia and showed a negative correlation with renal levels of
all NOS isoforms. AO diet in both genders was associated with less PAS-positive
staining and less mesangial expansion than the REG diet, an early increase in
cortical iNOS in males, and sex-specific changes in cortical eNOS at 20 weeks.
These effects of AO diet may contribute to sex-specific preservation of renal
function in females.
|Administration, Oral
[MESH]
|Animals
[MESH]
|Antioxidants/*administration & dosage
[MESH]
|Diabetes Mellitus, Type 2/complications/diet therapy/*enzymology
[MESH]