Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=28588208
&cmd=llinks): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests
in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 215
Human dimethylarginine dimethylaminohydrolase 1 inhibition by proton pump
inhibitors and the cardiovascular risk marker asymmetric dimethylarginine: in
vitro and in vivo significance
#MMPMID28588208
Tommasi S
; Elliot DJ
; Hulin JA
; Lewis BC
; McEvoy M
; Mangoni AA
Sci Rep
2017[Jun]; 7
(1
): 2871
PMID28588208
show ga
Proton pump inhibitor (PPI)-induced inhibition of dimethylarginine
dimethylaminohydrolase 1 (DDAH1), with consequent accumulation of the nitric
oxide synthase inhibitor asymmetric dimethylarginine (ADMA), might explain the
increased cardiovascular risk with PPI use. However, uncertainty exists regarding
whether clinical PPI concentrations significantly inhibit DDAH1 under linear
initial rate conditions, and whether PPI-induced DDAH1 inhibition significantly
increases ADMA in humans. DDAH1 inhibition by esomeprazole, omeprazole,
pantoprazole, lansoprazole and rabeprazole was determined by quantifying
DDAH1-mediated L-citrulline formation in vitro. Plasma ADMA was measured in PPI
users (n?=?134) and non-users (n?=?489) in the Hunter Community Study (HCS). At
clinical PPI concentrations (0.1-10??mol/L), DDAH1 retained >80% activity vs.
baseline. A significant, reversible, time-dependent inhibition was observed with
lansoprazole (66% activity at 240?min, P?=?0.034) and rabeprazole (25% activity
at 240?min, P?0.001). In regression analysis, PPI use was not associated with
ADMA in HCS participants (beta 0.012, 95% CI -0.001 to 0.025, P?=?0.077).
Furthermore, there were no differences in ADMA between specific PPIs (P?=?0.748).
At clinical concentrations, PPIs are weak, reversible, DDAH1 inhibitors in vitro.
The lack of significant associations between PPIs and ADMA in HCS participants
questions the significance of DDAH1 inhibition as a mechanism explaining the
increased cardiovascular risk reported with PPI use.