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2016 ; 173
(7
): 1128-42
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Renal effects of chronic pharmacological manipulation of CB2 receptors in rats
with diet-induced obesity
#MMPMID25537025
Jenkin KA
; O'Keefe L
; Simcocks AC
; Briffa JF
; Mathai ML
; McAinch AJ
; Hryciw DH
Br J Pharmacol
2016[Apr]; 173
(7
): 1128-42
PMID25537025
show ga
BACKGROUND AND PURPOSE: In diabetic nephropathy agonism of CB2 receptors reduces
albuminuria and podocyte loss; however, the role of CB2 receptors in
obesity-related nephropathy is unknown. The aim of this study was to determine
the role of CB2 receptors in a model of diet-induced obesity (DIO) and
characterize the hallmark signs of renal damage in response to agonism (AM1241)
and antagonism (AM630) of CB2 receptors. EXPERIMENTAL APPROACH: Male Sprague
Dawley rats were fed a high-fat diet (HFD: 40% digestible energy from lipids) for
10 weeks. In another cohort, after 9 weeks on a HFD, rats were injected daily
with either 3?mg·kg(-1) AM1241, 0.3?mg·kg(-1) AM630 or saline for 6 weeks. KEY
RESULTS: Ten weeks on a HFD significantly reduced renal expression of CB2
receptors and renal function. Treatment with AM1241 or AM630 did not reduce
weight gain or food consumption in DIO. Despite this, AM1241 significantly
reduced systolic BP, peri-renal adipose accumulation, plasma leptin, urinary
protein, urinary albumin, urinary sodium excretion and the fibrotic markers
TGF-?1, collagen IV and VEGF in kidney lysate. Treatment with AM630 of DIO rats
significantly reduced creatinine clearance and increased glomerular area and
kidney weight (gross and standardized for body weight). Diastolic BP, glucose
tolerance, insulin sensitivity, plasma creatinine, plasma TGF-?1 and kidney
expression of fibronectin and ?-smooth muscle actin were not altered by either
AM1241 or AM630 in DIO. CONCLUSIONS: This study demonstrates that while agonism
of CB2 receptors with AM1241 treatment for 6 weeks does not reduce weight gain in
obese rats, it leads to improvements in obesity-related renal dysfunction. LINKED
ARTICLES: This article is part of a themed section on Endocannabinoids. To view
the other articles in this section visit
http://onlinelibrary.wiley.com/doi/10.1111/bph.v173.7/issuetoc.