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Articles by M Ueno
Total Records ( 2 ) for M Ueno
  J Suzuki , M Ueno , M Uno , Y Hirose , Y Zenimaru , S Takahashi , J. i Osuga , S Ishibashi , M Takahashi , M Hirose , M Yamada , F. B Kraemer and I. Miyamori
 

Increased fatty acid (FA) flux and intracellular lipid accumulation (steatosis) give rise to cardiac lipotoxicity in both pathological and physiological conditions. Since hormone-sensitive lipase (HSL) contributes to intracellular lipolysis in adipose tissue and heart, we investigated the impact of HSL disruption on cardiac energy metabolism in response to fasting and refeeding. HSL-knockout (KO) mice and wild-type (WT) littermates were fasted for 24 h, followed by ~6 h of refeeding. Plasma FA concentration in WT mice was elevated twofold with fasting, whereas KO mice lacked this elevation, resulting in twofold lower cardiac FA uptake compared with WT mice. Echocardiography showed that fractional shortening was 15% decreased during fasting in WT mice and was associated with steatosis, whereas both of these changes were absent in KO mice. Compared with Langendorff-perfused hearts isolated from fasted WT mice, the isolated KO hearts also displayed higher contractile function and a blunted response to FA. Although cardiac glucose uptake in KO mice was comparable with WT mice under all conditions tested, cardiac VLDL uptake and lipoprotein lipase (LPL) activity were twofold higher in KO mice during fasting. The KO hearts showed undetectable activity of neutral cholesteryl esterase and 40% lower non-LPL triglyceride lipase activity compared with WT hearts in refed conditions accompanied by overt steatosis, normal cardiac function, and increased mRNA expression of adipose differentiation-related protein. Thus, the dissociation between cardiac steatosis and functional sequelae observed in HSL-KO mice suggests that excess FA influx, rather than steatosis per se, appears to play an important role in the pathogenesis of cardiac lipotoxicity.

  J. L Ferreiro , M Ueno , D Capodanno , B Desai , K Dharmashankar , A Darlington , R. K Charlton , T. A Bass and D. J. Angiolillo
  Background—

A drug interaction between clopidogrel and omeprazole resulting in impaired platelet inhibition has been reported. It has been suggested that staggering administration of clopidogrel and omeprazole may overcome this pharmacodynamic (PD) interaction.

Methods and Results—

This prospective, open-label, 3-period, randomized crossover study was performed in 20 healthy volunteers. Subjects were randomly selected to receive omeprazole (40 mg daily) concomitantly (CONC) or staggered by 8 to 12 hours (STAG) for 1 week on a background of clopidogrel therapy in a crossover fashion, with a 2- to 4-week washout period between treatments. After another 2- to 4-week washout period, all subjects were treated for 1 week with clopidogrel alone. Clopidogrel was administered as a 600-mg loading dose followed by a 75-mg maintenance dose during all phases. PD effects were assessed by vasodilator-stimulated phosphoprotein phosphorylation assay, VerifyNow P2Y12 system, and light transmittance aggregometry at baseline, 24 hours, and 1 week. The primary end point was the comparison of P2Y12 reactivity index assessed by vasodilator-stimulated phosphoprotein phosphorylation assay at 1 week between CONC and STAG regimens. No significant difference in the primary end point was observed (least squares mean±SEM, 56.1±3.5% for CONC versus 61.6±3.4% for STAG; P=0.08). P2Y12 reactivity index values were significantly lower in the clopidogrel regimen (48.8±3.4%) than in the CONC (P=0.02) and STAG (P=0.001) regimens. No PD differences were observed between regimens at baseline and 24 hours. Concordant results were obtained by P2Y12-specific assessments using VerifyNow but not with light transmittance aggregometry.

Conclusions—

Omeprazole impairs clopidogrel-induced antiplatelet effects in the maintenance phase of treatment irrespective of timing of their administration.

 
 
 
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