Fasting homocysteine was positively associated with MI risk
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shared by Nathan Goodyear on 06 Jan 14
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Effect of Increasing Glutathione With Cysteine and Glycine Supplementation on Mitochond... - 0 views
press.endocrine.org/...jc.2013-2376
glutathione cysteine glycine HIV insulin sensitivity metabolism muscle strenth
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shared by Nathan Goodyear on 10 Feb 14
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α-Lipoic Acid Induced Elevated S-adenosylhomocysteine and Depleted S-adenosyl... - 0 views
www.ncbi.nlm.nih.gov/...PMC2782850
IV alpha lipoic acid intravenous ALA cysteine SAMe liver disease cirrhosis
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Effects of mercury on the isolated he... [Toxicol Appl Pharmacol. 1999] - PubMed - NCBI - 0 views
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ScienceDirect - American Heart Journal : Plasma total cysteine and total homocysteine a... - 0 views
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Fasting plasma concentration of total homocysteine, but not total cysteine, was positively associated with MI risk.
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PLOS ONE: N-Acetyl Cysteine May Support Dopamine Neurons in Parkinson's Disease: Prelim... - 0 views
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shared by Nathan Goodyear on 02 Aug 12
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Oxidative Stress and Stress-Activated Signaling Pathways: A Unifying Hypothesis of Type... - 0 views
edrv.endojournals.org/...599.long
free radicals oxidative stress damage inflammation type II DM alpha lipoic acid alpha-lipoic-acid diabetes
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In patients with diabetes, LA levels are reduced (48, 74, 103). LA has long been used for the treatment of diabetic neuropathy in Germany
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LA has been shown to 1) quench free radicals, 2) prevent singlet oxygen-induced DNA damage, 3) exhibit chelating activity, 4) reduce lipid peroxidation, 5) increase intracellular glutathione levels, and 6) prevent glycation of serum albumin (73, 74). LA is able to reduce oxidative stress-mediated NF-κB activation in vitro (74, 108, 109) and in patients with type 2 diabetes
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Activation of NF-κB can also be blocked by several other thiol-containing antioxidants including N-acetyl-l-cysteine (NAC)
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Other clinically available antioxidants reported to have antiinflammatory, antioncogenic, and/or antiatherogenic properties that have been shown to block the activation of NF-κB include resveratrol (115, 116), (-)-epicatechin-3-gallate (117), pycnogenol (118), silymarin (119), and curcumin (120)
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shared by Nathan Goodyear on 11 Jun 12
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Controlled trial of N-acetylcysteine for patients with probable Alzheimer's disease - 0 views
www.medicinalnutraceutics.com/...AC%20Alzheimer's%20Disease.pdf
NAC N-acetylcysteine AD Alzheimer's disease Alzheimers inflammation AGE advanced glycation end products
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shared by Nathan Goodyear on 05 Jul 11
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Metabolic biomarkers of increased oxidative stress... [Am J Clin Nutr. 2004] - PubMed r... - 0 views
www.ncbi.nlm.nih.gov/...15585776
ASD autism spectrum disorder detoxification children SAMe SAH homocysteine cystathionine glutathione adenosine
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children with autism had significantly lower baseline plasma concentrations of methionine, SAM, homocysteine, cystathionine, cysteine, and total glutathione and significantly higher concentrations of SAH, adenosine, and oxidized glutathione
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This metabolic profile is consistent with impaired capacity for methylation (significantly lower ratio of SAM to SAH) and increased oxidative stress (significantly lower redox ratio of reduced glutathione to oxidized glutathione) in children with autism
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increased vulnerability to oxidative stress and a decreased capacity for methylation may contribute to the development and clinical manifestation of autism.
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shared by Nathan Goodyear on 11 Nov 14
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Role of Oxidative Stress and the Microenvironment in Breast Cancer Development and Prog... - 0 views
www.ncbi.nlm.nih.gov/...PMC3950899
cancer oxidative stress warburg effect reverse warburg effect ROS
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Oxidative stress generated by breast cancer cells activates HIF-1α and NFκB in fibroblasts, leading to autophagy and lysosomal degradation of Cav-1
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increased levels of hydrogen peroxide in exhaled breath condensate from patients with localized breast malignancy, associated with increased clinical severity
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Comparing mitochondrial metabolic activity revealed a difference between stroma and epithelial cells
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Overexpression of NOX4 in normal breast epithelial cells results in cellular senescence, resistance to apoptosis, and tumorigenic transformation, as well as increased aggressiveness of breast cancer cells
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metalloproteinases (MMP) such as MMP-2, MMP-3, and MMP-9 increase extracellular matrix turnover and are themselves activated by oxidative stress
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Lowered expression of Cav-1 not only leads to myofibroblast conversion and inflammation but also seems to impact aerobic glycolysis, leading to secretion of high energy metabolites such as pyruvate and lactate that drive mitochondrial oxidative phosphorylation in cancer cells
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secreted transforming growth factor β (TGFβ), insulin-like growth factor (IGF), platelet-derived growth factor (PDGF), fibroblast growth factor 2, and stromal-derived factor 1 (SDF1) are able to activate fibroblasts and increase cancer cell proliferation
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oxidative stress has an important role in the initiation and preservation of breast cancer progression
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the cancer cells produce hydrogen peroxide and by driving the “Reverse Warburg Effect” initiate oxidative stress in fibroblasts. As a result of this process, fibroblasts exhibited reduced mitochondrial activity, increased glucose uptake, ROS, and metabolite production.
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Oxidative stress results from an imbalance between unstable reactive species lacking one or more unpaired electrons (superoxide anion, hydrogen peroxide, hydroxyl radical, reactive nitrogen species) and antioxidants
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cancer cells are able to induce drivers of oxidative stress, autophagy and mitophagy: HIF-1α and NFκB in surrounding stroma fibro-blasts
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Studies show that loss of Cav-1 in adjacent breast cancer stroma fibroblasts can be prevented by treatment with N-acetyl cysteine, quercetin, or metformin
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hydrogen peroxide is one of the main factors that can push fibroblasts and cancer cells into senescence
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It is widely held that HIF-1α function is dependent upon its location within the tumor microenvironment. It acts as a tumor promoter in CAFs and as a tumor suppressor in cancer cells
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It was reported that overexpression of recombinant (SOD2) (Trimmer et al., 2011) or injection of SOD, catalase, or their pegylated counterparts can block recurrence and metastasis in mice
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obstructing oxidative stress in the tumor microenvironment can lead to mitophagy and promote breast cancer shutdown is a promising discovery for the development of future therapeutic interventions.
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Recent studies show that in the breast cancer microenvironment, oxidative stress causes mitochondrial dysfunction
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Really fascinating article on tumor signaling. The article points to a complex signaling between cancer cells and stromal fibroblasts that results in myofibroblast transformation that increases the microenvironment favorability of cancer. This article points to oxidative stress as the primary driving force.
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shared by Nathan Goodyear on 30 Jan 18
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Vitamin C preferentially kills cancer stem cells in hepatocellular carcinoma via SVCT-2... - 0 views
www.nature.com/...s41698-017-0044-8
cancer cancer stem cells liver cancer vitamin C IV vitamin C oncology
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Chen et al. have revealed that ascorbate at pharmacologic concentrations (0.3–20 mM) achieved only by intravenously (i.v.) administration selectively kills a variety of cancer cell lines in vitro, but has little cytotoxic effect on normal cells.
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Ascorbic acid (the reduced form of vitamin C) is specifically transported into cells by sodium-dependent vitamin C transporters (SVCTs)
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differential sensitivity to VC may result from variations in VC flow into cells, which is dependent on SVCT-2 expression.
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high-dose VC significantly impaired both the tumorspheres initiation (Fig. 4d, e) and the growth of established tumorspheres derived from HCC cells (Fig. 4f, g) in a time-dependent and dose-dependent manner.
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The antioxidant, N-acetyl-L-cysteine (NAC), preventing VC-induced ROS production (a ROS scavenger), completely restored the viability and colony formation among VC-treated cells
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Interestingly, the combination of VC and cisplatin was even more effective in reducing tumor growth and weight
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Consistent with the in vitro results, stemness-related genes expressions in tumor xenograft were remarkably reduced after VC or VC+cisplatin treatment, whereas conventional cisplatin therapy alone led to the increase of CSCs
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Interestingly, at extracellular concentrations greater than 1 mM, VC induces strong cytotoxicity to cancer cells including liver cancer cells
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we hypothesized that intravenous VC might reduce the risk of recurrence in HCC patients after curative liver resection.
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Intriguingly, the 5-year disease-free survival (DFS) for patients who received intravenous VC was 24%, as opposed to 15% for no intravenous VC-treated patients
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In this study, based on the elevated expression of SVCT-2, which is responsible for VC uptake, in liver CSCs, we revealed that clinically achievable concentrations of VC preferentially eradicated liver CSCs in vitro and in vivo
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Additionally, we found that intravenous VC reduced the risk of post-surgical HCC progression in a retrospective cohort study.
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Three hundred thirty-nine participants (55.3%) received 2 g intravenous VC for 4 or more days after initial hepatectomy
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As the key protein responsible for VC uptake in the liver, SVCT-2 played crucial roles in regulating the sensitivity to ascorbate-induced cytotoxicity
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we also observed that SVCT-2 was highly expressed in human HCC samples and preferentially elevated in liver CSCs
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we revealed that VC treatment dramatically reduced the self-renewal ability, expression levels of CSC-associated genes, and percentages of CSCs in HCC, indicating that CSCs were more susceptible to VC-induced cell death
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as a drug for eradicating CSCs, VC may represent a promising strategy for treatment of HCC, alone or particularly in combination with chemotherapeutic drugs
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In HCC, we found that VC-generated ROS caused genotoxic stress (DNA damage) and metabolic stress (ATP depletion), which further activated the cyclin-dependent kinase inhibitor p21, leading to G2/M phase cell cycle arrest and caspase-dependent apoptosis in HCC cells
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we demonstrated a synergistic effect of VC and chemotherapeutic drug cisplatin on killing HCC both in vitro and in vivo
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Intravenous VC has also been reported to reduce chemotherapy-associated toxicity of carboplatin and paclitaxel in patients,38 but the specific mechanism needs further investigation
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Our retrospective cohort study also showed that intravenous VC use (2 g) was related to the improved DFS in HCC patients after initial hepatectomy
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several clinical trials of high-dose intravenous VC have been conducted in patients with advanced cancer and have revealed improved quality of life and prolonged OS
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high expression (grade 2+/3+) of SVCT-2 was in agreement with poorer overall survival (OS) of HCC patients (Fig. 1c) and more aggressive tumor behavior
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these data suggest that SVCT-2 is preferentially expressed in liver CSCs and is required for the maintenance of liver CSCs.
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pharmacologic concentrations of plasma VC higher than 0.3 mM are achievable only from i.v. administration
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The viabilities of HCC cells were dramatically decreased after exposure to VC in dose-dependent manner
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These results verify that VC inhibits tumor growth in HCC PDX models and SVCT-2 expression level is associated with VC response
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qPCR and IHC analysis demonstrated that expression levels of CSC-associated genes and percentages of CSCs in PDXs dramatically declined after VC treatment, confirming the inhibitory role of VC in liver CSCs
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