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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+Pharmacol+Exp+Ther
2016 ; 358
(1
): 61-70
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Protective Action of Anandamide and Its COX-2 Metabolite against
l-Homocysteine-Induced NLRP3 Inflammasome Activation and Injury in Podocytes
#MMPMID27189966
Li G
; Xia M
; Abais JM
; Boini K
; Li PL
; Ritter JK
J Pharmacol Exp Ther
2016[Jul]; 358
(1
): 61-70
PMID27189966
show ga
Recent studies have demonstrated that l-homocysteine (Hcys)-induced podocyte
injury leading to glomerular damage or sclerosis is attributable to the
activation of the nucleotide-binding oligomerization domain-like receptor
containing pyrin domain 3 (NLRP3) inflammasome. Given the demonstrated
anti-inflammatory effects of endocannabinoids, the present study was designed to
test whether anandamide (AEA) or its metabolites diminish NLRP3 inflammasome
activation and prevent podocyte injury and associated glomerular damage during
hyperhomocysteinemia (hHcys). AEA (100 ?M) inhibited Hcys-induced NLRP3
inflammasome activation in cultured podocytes, as indicated by elevated caspase-1
activity and interleukin-1? levels, and attenuated podocyte dysfunction, as shown
by reduced vascular endothelial growth factor production. These effects of AEA
were inhibited by the cyclooxygenase-2 (COX-2) inhibitor celecoxib (CEL). In mice
in vivo, AEA treatment attenuated glomerular NLRP3 inflammasome activation
induced by hHcys accompanying a folate-free diet, on the basis of inhibition of
hHcys-induced colocalization of NLRP3 molecules and increased interleukin-1?
levels in glomeruli. Correspondingly, AEA prevented hHcys-induced proteinuria,
albuminuria, and glomerular damage observed microscopically. Hcys- and
AEA-induced effects were absent in NLRP3-knockout mice. These beneficial effects
of AEA against hHcys-induced NLRP3 inflammasome activation and glomerular injury
were not observed in mice cotreated with CEL. We further demonstrated that
prostaglandin E2-ethanolamide (PGE2-EA), a COX-2 product of AEA, at 10 ?M had a
similar inhibitory effect to that of 100 ?M AEA on Hcys-induced NLRP3
inflammasome formation and activation in cultured podocytes. From these results,
we conclude that AEA has anti-inflammatory properties, protecting podocytes from
Hcys-induced injury by inhibition of NLRP3 inflammasome activation through its
COX-2 metabolite, PGE2-EA.