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• W2009402980 abstract "Green tea catechins are primarily known to function as free radical scavengers and have several beneficial uses. Orally supplemented catechin (OSC) was previously shown to increase mitochondrial heme and catalase levels in rat heart blood, however, its effect in the cytosol has not been elucidated. Here, we determined the effects of OSC in the rat heart blood cytosol. We used middle-aged (40 week-old) and young (4 week-old) rats throughout the study. We isolated blood cytosol, verified its purity, and determined heme, hydrogen peroxide (H2O2) levels, catalase (CAT) activities, gp91phox amounts, NADP and NAD pools, sirtuin 1 (SIRT1) and glutathione reductase (GR) activities, and free fatty acids (FFA). We established that OSC is associated with decreased heme-dependent H2O2 amounts while increasing heme-independent CAT activity. Moreover, we found that OSC-related decrease in NAD+ amounts among middle-aged rats is associated to increased NADPH levels and SIRT1 activity. In contrast, we associated OSC-related decrease in NAD+ amounts among young rats to decreased NADPH levels and increased SIRT1 activity. This highlights a major difference between catechin-treated middle-aged and young rats. Furthermore, we observed that cytosolic FFA and GR levels were significantly increased only among OSC-treated middle-aged rats which we hypothesize are related to increased NADPH levels. This insinuates that OSC treatment allows higher catechin amounts to enter the bloodstream of middle-aged rats. We propose that this would favorably increase NADPH amounts and lead to the simultaneous decrease in NADPH-related pro-oxidant activity and increase in NADPH-related biomolecules and anti-oxidant activities." @default.
• W2009402980 created "2016-06-24" @default.
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• W2009402980 date "2015-04-01" @default.
• W2009402980 modified "2023-09-26" @default.
• W2009402980 title "Middle-aged rats orally supplemented with gel-encapsulated catechin favorably increases blood cytosolic NADPH levels" @default.
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• W2009402980 doi "https://doi.org/10.1016/j.phymed.2015.01.014" @default.
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