Glutamine Protects Activated Human T Cells from Apoptosis by Up-Regulating Glutathione and Bcl-2 Levels

Chang, Wei‐Kuo; Yang, Kuender D.; Chuang, Hai‐Hua; Jan, Jia-Tsong; Shaio, Men‐Fang

doi:10.1006/clim.2002.5257

Cited by 139 publications

(108 citation statements)

References 49 publications

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“…It has been reported that SOD and CAT can inhibit apoptosis in human neutrophils [110]. GSH can protect human T cells from apoptosis [111,112]. Previous studies from our laboratory showed that Ala, Cit and Pro restores the activities of SOD, CAT, GPx and levels of GSH in carp erythrocytes [30].…”

Section: Effects Of Ala Cit and Pro On • Oh-induced Apoptosismentioning

confidence: 89%

The metabolites of glutamine prevent hydroxyl radical-induced apoptosis through inhibiting mitochondria and calcium ion involved pathways in fish erythrocytes

Jiang

Liu

et al. 2016

Free Radical Biology and Medicine

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a b s t r a c tThe present study explored the apoptosis pathways in hydroxyl radicals ( • OH)-induced carp erythrocytes. Carp erythrocytes were treated with the caspase inhibitors in physiological carp saline (PCS) or Ca 2 þ -free PCS in the presence of 40 μM FeSO 4 /20 μM H 2 O 2 . The results showed that the generation of reactive oxygen species (ROS), the release of cytochrome c and DNA fragmentation were caspase-dependent, and Ca 2 þ was involved in calpain activation and phosphatidylserine (PS) exposure in • OH-induced carp erythrocytes. Moreover, the results suggested that caspases were involved in PS exposure, and Ca 2 þ was involved in DNA fragmentation in • OH-induced fish erythrocytes. These results demonstrated that there might be two apoptosis pathways in fish erythrocytes, one is the caspase and cytochrome c-dependent apoptosis that is similar to that in mammal nucleated cells, the other is the Ca 2 þ -involved apoptosis that was similar to that in mammal non-nucleated erythrocytes. So, fish erythrocytes may be used as a model for studying oxidative stress and apoptosis in mammal cells. Furthermore, the present study investigated the effects of glutamine (Gln)'s metabolites [alanine (Ala), citrulline (Cit), proline (Pro) and their combination (Ala 10 Pro 4 Cit 1 )] on the pathways of apoptosis in fish erythrocytes. The results displayed that Ala, Cit, Pro and Ala 10 Pro 4 Cit 1 effectively suppressed ROS generation, cytochrome c release, activation of caspase-3, caspase-8 and caspase-9 at the physiological concentrations, prevented Ca 2 þ influx, calpain activation, PS exposure, DNA fragmentation and the degradation of the cytoskeleton and oxidation of membrane and hemoglobin (Hb) and increased activity of anti-hydroxyl radical (AHR) in • OH-induced carp erythrocytes. Ala 10 Pro 4 Cit 1 produced a synergistic effect of inhibited oxidative stress and apoptosis in fish erythrocytes. These results demonstrated that Ala, Cit, Pro and their combination can protect mammal erythrocytes and nucleated cells against oxidative stress and apoptosis. The studies supported the use of Gln, Ala, Cit and Pro as oxidative stress and apoptosis inhibitors in mammal cells and the hypothesis that the inhibited effects of Gln on oxidative stress and apoptosis are at least partly dependent on that of its metabolites in mammalian.

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Section: Effects Of Ala Cit and Pro On • Oh-induced Apoptosismentioning

confidence: 89%

The metabolites of glutamine prevent hydroxyl radical-induced apoptosis through inhibiting mitochondria and calcium ion involved pathways in fish erythrocytes

Jiang

Liu

et al. 2016

Free Radical Biology and Medicine

View full text Add to dashboard Cite

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“…The negative influence of valine on ROS levels in the gill may be attributed to the contribution of valine to glutamine synthesis. Valine is a substrate for glutamine synthesis in porcine enterocytes [24], and glutamine significantly decreased ROS levels in human T cells [89]. However, the underlying mechanism of this effect requires further investigation.…”

Section: Valine Inhibited Apoptosis In the Gill Cells Of Young Grass mentioning

confidence: 99%

Changes in barrier health status of the gill for grass carp (Ctenopharyngodon idella) during valine deficiency: Regulation of tight junction protein transcript, antioxidant status and apoptosis-related gene expression

Feng

Luo

Jiang

et al. 2015

Fish & Shellfish Immunology

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“…Again, increased utilization of cellular Gln delayed and prevented neutrophil apoptosis (Tihan et al 2011). As a matter of fact, the antiapoptotic effects of Gln on T cells were investigated and it was found that Gln not only regulated intracellular oxidative balance but also precluded especially T cell apoptosis (Chang et al 2002). In accordance to this finding, a statistically significant increase in bcl-2 gene expression was thought to be the most important step of apoptosis preventing the effect of Gln in the period following its entry into the cell (Pithon-Curi et al 2003;Ran et al 2004;Tihan et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Ameliorative effect of supplementation with l-glutamine on oxidative stress, DNA damage, cell viability and hepatotoxicity induced by 2,3,7,8-tetrachlorodibenzo-p-dioxin in rat hepatocyte cultures

et al. 2012

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The most potent of the dioxins, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), is a persistent and ubiquitous environmental contaminant. And the health impact of exposure to TCDD is of great concern to the general public. Recent data indicate that Lglutamine (Gln) has antioxidant properties and may influence hepatotoxicity. The objective of the present study was undertaken to explore the effectiveness of Gln in alleviating the hepatotoxicity of TCDD on primary cultured rat hepatocytes. Gln (0.5, 1 and 2 mM) was added to cultures alone or simultaneously with TCDD (0.005 and 0.01 mM). The hepatocytes were treated with TCDD and Gln for 48 h. Then cell viability was detected by [3-(4,5-dimethyl-thiazol-2-yl) 2,5-diphenyltetrazolium bromide] (MTT) assay and lactate dehydrogenase (LDH) release, while total antioxidant capacity (TAC), total glutathione (TGSH) and total oxidative stress (TOS) levels were determined to evaluate the oxidative injury. The DNA damage was also analyzed by liver micronucleus assay (MN) and 8-oxo-2-deoxyguanosine (8-OH-dG). The results of MTT and LDH assays showed that TCDD decreased cell viability but not L-glutamine. TCDD also increased TOS level in rat hepatocytes and significantly decreased TAC and TGSH levels. On the basis of increasing doses, the dioxin in a dosedependent manner caused significant increases of micronucleated hepatocytes (MNHEPs) and 8-OH-dG as compared to control culture. Whereas, in cultures exposured with Gln alone, TOS levels were not changed and TAC and TGSH together were significantly increased in dose-dependent fashion. The presence of Gln with TCDD modulated the hepatotoxic effects of TCDD on primary hepatocytes cultures. Noteworthy, Gln has a protective effect against TCDD-mediated DNA damages. As conclusion, we reported here an increased potential therapeutic significance of L-glutamine in TCDD-mediated hepatic injury for the first time.

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Glutamine Protects Activated Human T Cells from Apoptosis by Up-Regulating Glutathione and Bcl-2 Levels

Cited by 139 publications

References 49 publications

The metabolites of glutamine prevent hydroxyl radical-induced apoptosis through inhibiting mitochondria and calcium ion involved pathways in fish erythrocytes

The metabolites of glutamine prevent hydroxyl radical-induced apoptosis through inhibiting mitochondria and calcium ion involved pathways in fish erythrocytes

Changes in barrier health status of the gill for grass carp (Ctenopharyngodon idella) during valine deficiency: Regulation of tight junction protein transcript, antioxidant status and apoptosis-related gene expression

Ameliorative effect of supplementation with l-glutamine on oxidative stress, DNA damage, cell viability and hepatotoxicity induced by 2,3,7,8-tetrachlorodibenzo-p-dioxin in rat hepatocyte cultures

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