The blood level of thioredoxin 1 as a supporting biomarker in the detection of breast cancer.

BACKGROUND: There is a long-time unmet need for a means to detect breast cancer (BC) using blood. Although mammography is accepted as the gold standard for screening, a blood-based diagnostic can complement mammography and assist in the accurate detection of BC in the diagnostic process period of early diagnosis. We have previously reported the possible use of thioredoxin 1 (Trx1) in serum as a novel means to detect BC. In the present study, we validated the clinical utility of Trx1 to identify BC by testing sera from biopsy-confirmed cancer patients and women without cancer. METHODS: We have generated monoclonal antibodies against Trx1 and developed an ELISA kit that can quantitate Trx1 in sera. The level of Trx1 was determined in each serum from women without cancer (n = 114), as well as in serum from patients with BC (n = 106) and other types of cancers (n = 74), including cervical, lung, stomach, colorectal, and thyroid cancer. The sera from BC patients were collected and classified by the subjects' age and cancer stage. In addition to the Trx1 levels of BC patients, several pathological and molecular aspects of BC were analyzed. Test results were retrospectively compared to those from mammography. Each test was duplicated, and test results were analyzed by ROC analysis, one-way ANOVA tests, and unpaired t-tests. RESULTS: The mean level of Trx1 from women without cancer was 5.45 ± 4.16 (±SD) ng/ml, that of the other malignant cancer patient group was 2.70 ± 2.01 ng/ml, and that from the BC group was 21.96 ± 6.79 ng/ml. The difference among these values was large enough to distinguish BC sera from non-BC control sera with a sensitivity of 97.17% and specificity of 94.15% (AUC 0.990, p < 0.0001). Most Trx1 levels from BC patients' sera were higher than the cut-off value of 11.4 ng/ml regardless of age, stage, histological grade, type, and specific receptors' expression profile of BC. The level of Trx1 could rescue women from most cases of misread or incomplete mammography diagnoses. CONCLUSION: These results indicated that the blood level of Trx1 could be an effective and accurate means to assist the detection of BC during the early diagnosis period.

Carvacrol hinders the progression of hepatic fibrosis via targeting autotaxin and thioredoxin in thioacetamide-induced liver fibrosis in rat.

Fibrosis is a common outcome of nearly all chronic diseases of liver that results in changes of its functions which requires medical attention. The current research aims to investigate the potential anti-fibrotic efficacy of Carvacrol against thioacetamide (TAA)-induced liver fibrosis in male rats using Ursodeoxycholic acid (UDCA) as a reference anti-fibrotic product. Carvacrol (25 and 50 mg/kg) markedly declined TAA-increased serum liver enzymes; alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP) and gamma-glutamyl transferase (GGT) as well as total bilirubin (TB) and direct bilirubin (DB) levels as well as increased levels of total protein (TP) and albumin. Carvacrol significantly reduced glutathione depletion (GSH), Nitric oxide (NOX) and malondialdehyde (MDA) accumulation in liver tissue. Additionally, its anti-oxidant effect brightened up via affecting markers of stress found in the cell as nuclear factor erythroid 2-related factor 2 (Nrf-2) where it still had high content and decreased Thioredoxin (Trx) level. The anti-inflammatory effect of Carvacrol was confirmed by decreasing nuclear factor kappa B (NF-κB), interleukin-1beta (IL-1ß) and inducible nitric oxide synthase (iNOS) contents. Carvacrol showed anti-fibrotic effect clarified by turning down fibrosis-related markers; TGF-ß1, matrix metalloproteinase-3 and 9 (MMP-3 and 9) and Autotaxin (ATX) contents. Furthermore, it decreased alpha smooth muscle actin (α-SMA) and caspase-3 immune-expression. The overall outcome of aforementioned markers results showed that Carvacrol suppresses the progression of liver fibrosis via its anti-oxidant, anti-inflammatory, anti-apoptotic effect and its ability in lowering Thioredoxin and Autotaxin; hence it can be categorized as a hepatoprotective natural substance.

Elevated serum 4HNE plus decreased serum thioredoxin: Unique feature and implications for acute exacerbation of chronic obstructive pulmonary disease.

Acute exacerbation of chronic obstructive pulmonary disease (AECOPD) is a global problem with high mortality. Its pathogenesis is not fully understood. To reveal new serum feature of AECOPD and their potential implications, we have analyzed 180 serum samples, and found that in the serum of AECOPD patients, 4-hydroxy-2-nonenal (4HNE)-protein adducts are dynamically increased as partial pressure of oxygen (PaO2) drops, which is accompanied by progressively decreasing thioredoxin reductase (TrxR1) and thioredoxin (Trx1), as compared with those of healthy people. This phenomenon is unique, because acute hypoxia patients have 1.1-fold or 1.7-fold higher serum TrxR1 or Trx1 activity, respectively, than healthy people, in keeping with low 4HNE level. Moreover, serum 4HNE-protein adducts may form disulfide-linked complexes with high-molecular-weight, the amount of which is significantly increased during AECOPD. Serum 4HNE-protein adducts include 4HNE-Trx1 adduct and 4HNE-TrxR1 adduct, but only the former is significantly increased during AECOPD. Through cell biology, biochemistry and proteomics methods, we have demonstrated that extracellular 4HNE and 4HNE-Trx1 adduct affect human bronchial epithelial cells via different mechanisms. 4HNE-Trx1 adduct may significantly alter the expression of proteins involved mainly in RNA metabolism, but it has no effect on TrxR1/Trx1 expression and cell viability. On the other hand, low levels of 4HNE promote TrxR1/Trx1 expression and cell viability, while high levels of 4HNE inhibit TrxR1/Trx1 expression and cell viability, during which Trx1, at least in part, mediate the 4HNE action. Our data suggest that increasing serum 4HNE and decreasing serum Trx1 in AECOPD patients are closely related to the pathological processes of the disease. This finding also provides a new basis for AECOPD patients to use antioxidant drugs.

New insights into serum/extracellular thioredoxin in regulating hepatic insulin receptor activation.

BACKGROUND: Serum thioredoxin of type-2 diabetic patients is significantly higher than that of healthy people. Pathophysiological significance is unclear. METHODS: Effects of serum/extracellular thioredoxin on phosphorylation (activation) of hepatic insulin receptor (IR) were investigated by using methods in biochemistry, cell/molecular biology and mass spectrometry. RESULTS: In human serum, thioredoxin and insulin may interact. Their mixture contains a mixed disulfide between insulin B-chain and thioredoxin-Cys73, which limits their activities. In contrast, free form of serum/extracellular thioredoxin is active, and can regulate phosphorylation of insulin receptor ß-subunits (IRß) via direct/indirect mechanisms. The direct mechanism associates with positive regulation. Serum/extracellular thioredoxin increases insulin binding to IR, facilitating insulin-induced phosphorylation of IRß and downstream AKT. The indirect mechanism is involved in negative regulation. Entry of extracellular thioredoxin into hepatic cells via IR enhances the expression and activity of cellular protein-tyrosine phosphatase 1B (PTP1B), which negatively regulates IRß phosphorylation. After coordination between these two mechanisms, the positive impact of serum/extracellular thioredoxin overwhelms its negative impact on IRß phosphorylation, which subsequently accelerates hepatic glucose uptake. In hepatic cells with thioredoxin deficiency, insulin-induced IRß phosphorylation is decreased, which could be restored by extracellular thioredoxin entry. Moreover, the results from assaying 475 serum samples demonstrate a discriminating value of serum thioredoxin activity in diagnosing type-2 diabetes. CONCLUSION: Serum/extracellular thioredoxin plays a critical role in regulating hepatic IRß phosphorylation. GENERAL SIGNIFICANCE: In case of insulin resistance/type-2 diabetes, hepatic IRß is at low phosphorylation level, thereby the improvement effect of serum/extracellular thioredoxin on insulin-induced IRß phosphorylation seems particularly important.

The expression of thioredoxin-1 and inflammatory cytokines in patients with sepsis.

Background: Sepsis is life-threatening organ dysfunction caused by a dysregulated host response to infection. Inflammatory response and oxidative stress play an important role in the pathophysiological process of sepsis. Thioredoxin-1 (Trx-1) is a small ubiquitous thiol protein with redox/inflammation modulatory properties relevant to the pathogenesis of sepsis. We therefore investigated the expression level and significance of Trx-1, inflammatory factors and oxidative stress in peripheral blood of sepsis patients, and to explore Trx-1 relationship with inflammatory factors and oxidative stress.Methods: Plasma samples were collected from patients with sepsis and those with healthy control. Enzyme-linked immunosorbent assays (ELISA) were used to detect for interleukin (IL-1ß), IL-6, tumor necrosis factor (TNF-α), E-selectin, endothelin-1 (ET-1), thioredoxin-1, C-reactive protein (CRP), procalcitonin (PCT) for human plasma samples; RT-PCR detection of Trx-1 and thioredoxin-interacting protein (TXNIP) mRNA levels. Colorimetric assay for glutathione (GSH) and malondialdehyde (MDA) expression level in peripheral blood of patients with sepsis; Disease severity was assessed as APACHE II.Results: The expression levels of Trx-1, inflammatory factors and oxidative stress in plasma of patients with sepsis were significantly increased, TXNIP opposite.Conclusion: Our results show that Trx-1 play important role in inflammation and oxidative stress in sepsis patients. Trx-1 may be a potential therapeutic target in sepsis.

Plasma protein(s)-based conceptual diagnostic tool for assessing high-altitude acclimation in humans.

Exposure to high altitude above 3000 m leads to two outcomes-acclimation or high-altitude maladies. To reach a particular outcome, the plasma proteome is modified differentially, either in context of an acclimation response or mal-acclimation response leading to disease. This ensures that hypoxia-responsive plasma protein trends reflect acclimation in acclimated individuals when compared with their levels prior to acclimation. Such protein trends could be used to assess acclimation in an individual and any significant deviation from this trend may indicate non-acclimation, thereby preventing high-altitude illnesses before they manifest. In this study, we investigate and statistically evaluate the trendlines of various hypoxia-responsive plasma protein levels, reported significantly perturbed in our previous studies, in individuals (male; n = 20) exposed to 3520 m at high-altitude day 1 (HAD1), HAD4, and HAD7L and to 4420 m at HAD7H, HAD30, and HAD120. We observe that thioredoxin (Trx), glutathione peroxidase 3 (GPx-3), and apolipoprotein AI (Apo-AI) are statistically robust markers to assess acclimation across the exposure duration while sulfotransferase 1A1 (ST1A1) is a capable negative control whose levels increase only in cases of HAPE. We also observe exposure day-specific and resident altitude-specific proteins capable of accurately assessing acclimation when compared with baseline levels or the lower altitude zone.

A combination of α-fetoprotein, midkine, thioredoxin and a metabolite for predicting hepatocellular carcinoma.

INTRODUCTION AND OBJECTIVES: The heterogenous nature of hepatocellular carcinoma (HCC) motivated this attempt at developing and validating a model based on combined biomarkers for improving early HCC detection. PATIENTS/MATERIALS AND METHODS: This study examined 196 patients for an estimation study (104 patients with HCC, 52 with liver cirrhosis and 40 with liver fibrosis) and 122 patients for the validation study (80 patients with HCC, 42 with liver cirrhosis). All patients were positive for hepatitis C virus. Four markers were measured: Midkine and thioredoxin using ELISA, 1-methyladenosine and 1-methylguanosine using a gas chromatography-mass spectrometry (GC-MS). The results were compared with alpha-fetoprotein (AFP). The performance of the model was estimated in BCLC, CLIP and Okuda staging systems of HCC. RESULTS: The model yielded high performance with an area under ROC (AUC) of 0.94 for predicting HCC in patients with liver cirrhosis, compared with AUC of 0.69 for AFP. This model had AUCs of 0.93, 0.94 and 0.94 in patients who had only one single nodule, absent macrovascular invasion and tumor size <2cm, respectively, compared with AUCs of 0.71, 0.6 and 0.59 for AFP. The model produced AUCs of 0.91 for BCLC (0-A), 0.92 for CLIP (0-1) and 0.94 for Okuda (stage I) compared with AUCs of 0.56, 0.58 and 0.64 for AFP. No significant difference was found between AUC in the estimation and the validation groups. CONCLUSION: This model may enhance early-stage HCC detection and help to overcome insufficient sensitivity of AFP.

Increased serum thioredoxin levels are not correlated with executive functions in children with attention deficit hyperactivity disorder.

The first step of this study aims to determine whether thioredoxin (Trx) has a potential role in attention deficit hyperactivity disorder (ADHD) by measuring serum Trx levels in children with ADHD. In the second step, this study aims to reveal whether there is any relationship between Trx and executive functions. This is the first study investigating the serum levels of Trx in children with ADHD. This study sample included 45 patients diagnosed with ADHD and 30 healthy controls. Conners Teacher Rating Scale (CTRS) and Behavior Rating Inventory of Executive Function (BRIEF) are used to evaluate ADHD presentation, severity and executive functions, respectively. Trx levels were measured using an enzyme-linked immunosorbent assay (ELISA) kit. Significantly higher Trx levels were found in children with ADHD. No significant correlations were found between serum Trx levels and executive functions for controls or ADHD group; although hyperactive/impulsive ADHD presentation showed positive correlations with some subdomains of executive function. Serum Trx levels and disease severity, measured by CTRS, showed non-significant correlations. This study may be the first step in the study of the role played by Trx and oxidative stress in ADHD, further research is needed to support these preliminary findings.

Analysis of IL17A and IL21 Expression in the Small Intestine of Celiac Disease Patients and Correlation with Circulating Thioredoxin Level.

AIMS: Th17 cells and their related cytokines play an important role in the pathogenesis of celiac disease (CD), and thioredoxin (Trx) is an extracellular TG2 activity regulator. This study evaluated Trx serum levels and the expression levels of IL17A, IL21, and Trx genes in biopsies of treated (gluten-free diet) and naïve (untreated) CD patients compared with healthy individuals. METHODS: Duodenal biopsies were collected from treated CD patients (n = 60), healthy controls (n = 60), and eight newly diagnosed celiac patients. IL17A, IL21, and Trx gene expression was assessed by quantitative polymerase chain reaction (qPCR) and compared with serum Trx levels assessed by enzyme-linked immunosorbent assay (ELISA). RESULTS: Expression levels of the IL21 and Trx genes were not significantly modulated in the CD group compared to the control group, whereas the IL17A gene in CD patients was transcribed at significantly higher levels among the CD group. Serum concentrations of Trx were significantly increased in treated CD patients compared to the control group. CONCLUSIONS: We observed that IL17A gene is more highly expressed in duodenal biopsies of CD patients than controls, and that the serum levels of Trx are significantly higher in treated CD patients than controls. Therefore, the expression levels of these genes and gene products, respectively, could potentially be used as diagnostic biomarkers for CD patients, although more studies are needed to unravel the underlying molecular mechanisms.

The effect of astaxanthin and cadmium on rat erythrocyte G6PD, 6PGD, GR, and TrxR enzymes activities in vivo and on rat erythrocyte 6PGD enzyme activity in vitro.

In this study, the effects of astaxanthin (AST) that belongs to carotenoid family and cadmium (Cd), which is an important heavy metal, on rat erythrocyte G6PD, 6PGD, GR, and TrxR enzyme activities in vivo and on rat erythrocyte 6PGD enzyme activity in vitro were studied. In in vitro studies, 6PGD enzyme was purified from rat erythrocytes with 2',5'-ADP Sepharose4B affinity chromatography. Results showed inhibition of enzyme by Cd at IC50 ; 346.5 µM value and increase of 6PGD enzyme activity by AST. In vivo studies showed an increase in G6PD, 6PGD, and GR enzyme activities (P Ëƒ 0.05) and no chance in TrxR enzyme activity by AST. Cd ion inhibited G6PD, 6PGD, and GR enzyme activities (P Ë‚ 0.05) and also decreased TrxR enzyme activity (P Ëƒ 0.05). AST + Cd group G6PD enzyme activity was statistically low compared with control group (P Ë‚ 0.05). 6PGD and TrxR enzyme activities decreased without statistical significance (P Ëƒ 0.05); however, GR enzyme activity increased statistically significantly (P Ë‚ 0.05).

8-F2-isoprostane, thioredoxin and thioredoxin reductase levels in children with obsessive-compulsive disorder.

PURPOSE: Accumulating data demonstrate that oxidative stress may play a crucial role in obsessive-compulsive disorder (OCD). This study aimed to investigate the role of 8-F2-isoprostane, thioredoxin (Trx), and thioredoxin reductase (TrxR) in children with OCD. MATERIALS AND METHODS: Thirty-three drug-free children with OCD and 35 healthy controls were included in this study. The severity of OCD symptoms was assessed via the Children's Yale Brown Obsessive-Compulsive Scale. The severity of anxiety levels was determined through the Screen for Child Anxiety-Related Emotional Disorders. Plasma levels of 8-F2-isoprostane, Trx, and TrxR were measured using commercial enzyme-linked immunosorbent assay kits. RESULTS: Plasma 8-F2-isoprostane, Trx, and TrxR levels did not show any significant differences between patient and control groups. There were no significant correlations between plasma levels of these antioxidants and severity of OCD. CONCLUSIONS: Findings of this study did not support the involvement of oxidative stress in the etiology of childhood OCD.

Curcumin Attenuates Inflammation in a Severe Acute Pancreatitis Animal Model by Regulating TRAF1/ASK1 Signaling.

BACKGROUND Inflammation plays an important role in initiation and development of severe acute pancreatitis (SAP). Curcumin exerts potent anti-inflammatory effects in many diseases, including acute pancreatitis. However, the specific molecular mechanisms are not clear. MATERIAL AND METHODS Intra-biliopancreatic duct injection of taurocholate was used to establish an animal model of SAP. Curcumin was administrated to animals as pre-treatments. Concentrations of cytokines in serum and ascites were measured by enzyme-linked immunosorbent assay (ELISA). A colorimetric method was used to determine the amylase activity. Western blotting was used to examine the expression levels and phosphorylation levels of proteins. Immunoprecipitation was used to assess the molecular association between apoptosis signal- regulating kinase 1 (ASK1) and thioredoxin (Trx). RESULTS Pre-treatment with curcumin reduced the concentrations of interleukin (IL6) and tumor necrosis factor (TNFα) in serum and ascites, as well as the ascites volume and amylase activity in SAP rats. Pre-treatment with curcumin reduced the expression level of TNF receptor-associated factor 1 (TRAF1), IL6, and TNFa in pancreas in SAP rats. Moreover, the phosphorylation levels of mitogen-activated protein kinase (MAPK) kinase 4 (MKK4), MKK7, and c-Jun NH(2)-terminal protein kinase (JNK) were reduced by curcumin pre-treatment. The molecular association between ASK1 and Trx was recovered by curcumin pre-treatment. As a result, the nuclear translocation of nuclear factor kappa B (NF-κB) was suppressed in pancreases from SAP rats. CONCLUSIONS Activation of the TRAF1/ASK1/JNK/NF-κB signaling pathway is involved in the inflammation of SAP. Curcumin exerts anti-inflammatory effects by suppressing this proinflammatory pathway.

Thioredoxin is not a marker for treatment-resistance depression but associated with cognitive function: An rTMS study.

Elevated oxidative stress is known to play an important role in development of depression and cognitive dysfunction. To date, thioredoxin (TRX), an antioxidant protein, has been investigated as a marker for psychiatric disorders such as schizophrenia, bipolar disorder and autism but its relationship with depression is yet to be unknown. The aim of this study is to detect the TRX levels in patients with treatment-resistant depression (TRD), analyse the effect of rTMS (repetitive transcranial magnetic stimulation) application on TRX levels and display the relationship of TRX with cognitive areas. This study included 27 treatment-resistant unipolar depression patients and 29 healthy subjects. Patients were evaluated by Hamilton Depression Scale (HDRS), Hamilton Anxiety Scale (HARS) and Montreal Cognitive Assessment (MoCA) before and after rTMS application. 23 of TRD patients were applied high-frequency rTMS over left DLPFC for 2 to 4weeks and plasma TRX levels of patients and healthy subjects were measured. No significant difference was determined between the TRX levels of patients and healthy subjects (p>0.05). After rTMS application there were significant decrease in severity of depression (p<0.001) and anxiety (p<0.001), and explicit improvement in cognitive areas (delayed memory, visual-spatial/executive abilities and language points) (all p<0.05). No difference was detected in TRX levels of the patients after rTMS application (p>0.005). High language scores of the patients were found to be associated with high TRX levels (p<0.005). Our study indicates that TRX levels cannot be used as a marker for TRD or rTMS treatment in TRD. In spite of this TRX levels have a positive correlation with language functions of the patients of TRD. More extensive studies are required to clarify the mechanism of action of TRX and the effect of TRX on cognitive functions.

Prognostic value of serum thioredoxin levels in ischemic stroke.

OBJECTIVES: Thioredoxin (Trx) is one of significant antioxidative molecules to diminish oxidative stress. Current evidence suggests that Trx is a potent antioxidant with cytoprotective functions. The aim of our study was to investigate specifically the association between serum Trx levels and acute ischemic stroke (AIS) patients. METHODS: 198 AIS patients and 75 controls were enrolled to the study. Serum Trx levels were measured using an enzyme-linked immunosorbent assay (ELISA). Stroke severity was assessed with the National Institutes of Health Stroke Scale (NIHSS) score on admission. Clinical endpoint was functional outcome measured by Barthel Index (BI) 3 months after admission. Multivariate binary logistic regression analyses were performed to identify predictors. RESULTS: We found that serum Trx levels were significantly increased in patients as compared to controls. Serum Trx was an independent biomarker to predict ischemic stroke (OR, 1.264; 95% CI, 1.04-1.537; P = 0.019). In addition, there was a negative correlation between NIHSS score at admission and serum Trx levels in cardioembolic stroke patients (r = -0.422; P = 0.013). Furthermore, higher serum Trx levels in AIS patients were associated with favorable functional outcome. Serum Trx was an independent predictor for the functional outcome (OR, 0.862; 95% CI, 0.75-0.991; P = 0.037). CONCLUSIONS: Serum Trx might be as a biomarker of cardioembolic stroke severity. Increased serum Trx levels could be a useful tool to predict good prognosis in patients with AIS.

Thioredoxin-1, redox factor-1 and thioredoxin-interacting protein, mRNAs are differentially expressed in Multiple Sclerosis patients exposed and non-exposed to interferon and immunosuppressive treatments.

BACKGROUND: Oxidative stress is closely linked to inflammation in neurodegenerative diseases. We aimed to investigate the expression of redox system genes in Multiple Sclerosis (MS) patients either exposed or not exposed to conventional treatments. METHODS: Forty-four MS patients were divided into three groups: newly diagnosed (Group 1), receiving interferon (Group 2) and receiving immunosuppressive drugs (Group 3). Also, 15 healthy controls were enrolled. The mRNA expression of TRX1, TXNRD1, TRX2, TXNRD2, TXNIP, and APEX1 genes in peripheral blood mononuclear cells (PBMCs) was assessed by relative quantitative real-time PCR. Also, serum level of Trx1 was measured by ELISA. RESULTS: Serum level of Trx1 in the newly diagnosed MS patients was significantly higher compared to the healthy controls (P=0.013). Likewise, TRX1 and APEX1 expressions were significantly higher in the newly diagnosed patients compared to controls (P=0.003 and P=0.042), patients under interferon treatment (P=0.003 and P=0.013), and patients received immunosuppressants (P=0.001 and P=0.025). Furthermore, TXNIP expression in MS patients (either group 1, group 2, or group 3) was significantly lower than that in the control group (P=0.017, P=0.002, and P=0.022 respectively). The expression of TXNRD1, TRX2, and TXNRD2 did not show any significant difference between the control and the MS patient (P>0.05). CONCLUSIONS: Our data showed that redox system elements are differentially expressed in newly diagnosed MS patients, or patients receiving either interferon or immunosuppressive treatments. However, much more studies are required to confirm our findings and clarify the underlying mechanisms.

Human Plasma Thioredoxin-80 Increases With Age and in ApoE-/- Mice Induces Inflammation, Angiogenesis, and Atherosclerosis.

BACKGROUND: Thioredoxin (TRX)-1, a ubiquitous 12-kDa protein, exerts antioxidant and anti-inflammatory effects. In contrast, the truncated form, called TRX80, produced by macrophages induces upregulation of proinflammatory cytokines. TRX80 also promotes the differentiation of mouse peritoneal and human macrophages toward a proinflammatory M1 phenotype. METHODS: TRX1 and TRX80 plasma levels were determined with a specific ELISA. A disintegrin and metalloproteinase domain-containing protein (ADAM)-10, ADAM-17, and ADAM-10 activities were measured with SensoLyte 520 ADAM10 Activity Assay Kit, Fluorimetric, and InnoZyme TACE Activity Kit, respectively. Western immunoblots were performed with specific antibodies to ADAM-10 or ADAM-17. Angiogenesis study was evaluated in vitro with human microvascular endothelial cells-1 and in vivo with the Matrigel plug angiogenesis assay in mice. The expression of macrophage phenotype markers was investigated with real-time polymerase chain reaction. Phosphorylation of Akt, mechanistic target of rapamycin, and 70S6K was determined with specific antibodies. The effect of TRX80 on NLRP3 inflammasome activity was evaluated by measuring the level of interleukin-1ß and -18 in the supernatants of activated macrophages with ELISA. Hearts were used for lesion surface evaluation and immunohistochemical studies, and whole descending aorta were stained with Oil Red O. For transgenic mice generation, the human scavenger receptor (SR-A) promoter/enhancer was used to drive macrophage-specific expression of human TRX80 in mice. RESULTS: In this study, we observed a significant increase of plasma levels of TRX80 in old subjects compared with healthy young subjects. In parallel, an increase in expression and activity of ADAM-10 and ADAM-17 in old peripheral blood mononuclear cells compared with those of young subjects was observed. Furthermore, TRX80 was found to colocalize with tumor necrosis factor-α, a macrophage M1 marker, in human atherosclerotic plaque. In addition, TRX80 induced the expression of murine M1 macrophage markers through Akt2/mechanistic target of rapamycin-C1/70S6K pathway and activated the inflammasome NLRP3, leading to the release of interleukin-1ß and -18, potent atherogenic cytokines. Moreover, TRX80 exerts a powerful angiogenic effect in both in vitro and in vivo mouse studies. Finally, transgenic mice that overexpress human TRX80 specifically in macrophages of apoE-/- mice have a significant increase of aortic atherosclerotic lesions. CONCLUSIONS: TRX80 showed an age-dependent increase in human plasma. In mouse models, TRX80 was associated with a proinflammatory status and increased atherosclerosis.

Jab1/Csn5-Thioredoxin Signaling in Relapsed Acute Monocytic Leukemia under Oxidative Stress.

Purpose: High levels of ROS and ineffective antioxidant systems contribute to oxidative stress, which affects the function of hematopoietic cells in acute myeloid leukemia (AML); however, the mechanisms by which ROS lead to malignant transformation in relapsed AML-M5 are not completely understood. We hypothesized that alterations in intracellular ROS would trigger AML-M5 relapse by activating the intrinsic pathway.Experimental Design: We studied ROS levels and conducted c-Jun activation domain-binding protein-1 (JAB1/COPS5) and thioredoxin (TRX) gene expression analyses with blood samples obtained from 60 matched AML-M5 patients at diagnosis and relapse and conducted mechanism studies of Jab1's regulation of Trx in leukemia cell lines.Results: Our data showed that increased production of ROS and a low capacity of antioxidant enzymes were characteristics of AML-M5, both at diagnosis and at relapse. Consistently, increased gene expression levels of TRX and JAB1/COPS5 were associated with low overall survival rates in patients with AML-M5. In addition, stimulating AML-M5 cells with low concentrations of hydrogen peroxide led to increased Jab1 and Trx expression. Consistently, transfection of ectopic Jab1 into leukemia cells increased Trx expression, whereas silencing of Jab1 in leukemia cells reduced Trx expression. Mechanistically, Jab1 interacted with Trx and stabilized Trx protein. Moreover, Jab1 transcriptionally regulated Trx. Furthermore, depletion of Jab1 inhibited leukemia cell growth both in vitro and in vivoConclusions: We identified a novel Jab1-Trx axis that is a key cellular process in the pathobiologic characteristics of AML-M5. Targeting the ROS/Jab1/Trx pathway could be beneficial in the treatment of AML-M5. Clin Cancer Res; 23(15); 4450-61. ©2017 AACR.

Serum thioredoxin and in-hospital major adverse events after traumatic brain injury.

BACKGROUND: In-hospital major adverse events (IMAEs), mainly including acute lung injury, acute traumatic coagulopathy, progressive hemorrhagic injury and posttraumatic cerebral infarction, are associated with poor prognosis after traumatic brain injury (TBI). Thioredoxin, a potent anti-oxidant, has been identified as an oxidative stress marker. This study was designed to explore the association of serum thioredoxin concentrations with IMAEs of patients with severe TBI. METHODS: This prospective, observational study recruited a total of 108 healthy controls and 108 patients with severe TBI. We investigated the possible relation of serum thioredoxin concentrations to IMAEs and trauma severity (reflected by Glasgow coma scale scores) following TBI using a multivariate analysis. RESULTS: Serum thioredoxin concentrations were higher in the patients than in the controls. Serum concentrations of thioredoxin significantly correlated with admission Glasgow coma scale scores. Thioredoxin in serum independently predicted any IMAEs. As compared to admission Glasgow coma scale scores, thioredoxin concentrations had similar areas under receiver operating characteristic curve for any IMAEs. CONCLUSION: Increased serum thioredoxin concentrations are highly associated with trauma severity and IMAEs, indicating thioredoxin might be a potential prognostic biomarker after TBI.

Postoperative serum thioredoxin concentrations correlate with delirium and cognitive dysfunction after hip fracture surgery in elderly patients.

BACKGROUND: Oxidative stress correlates with occurrence and development of postoperative delirium (POD) and cognitive dysfunction (POCD). Thioredoxin (TRX) is a potent anti-oxidant and its circulating concentrations reflect extent of brain injury. We determined the relation of serum TRX concentrations to POD and POCD in elderly patients undergoing hip fracture surgery. METHODS: In this prospective, observatory study, TRX concentrations in preoperative and postoperative serum from 192 patients and serum from 192 controls were measured using an enzyme-linked immunosorbent assay. The relationship between TRX concentrations and risk of POD and POCD was assessed using a multivariate analysis. RESULTS: As compared to the controls, postoperative, but not preoperative serum TRX concentrations were significantly increased in the patients. Furthermore, postoperative TRX concentrations and age were identified as the independent predictors for POD and POCD. Also, area under receiver operating characteristic curve (AUC) of postoperative TRX concentrations was obviously higher than that of age in the prediction of POD and POCD. Additionally, in a combined logistic-regression model, TRX concentrations significantly improved the AUCs of age to predict POD and POCD. CONCLUSIONS: TRX in postoperative serum may be a potential biomarker to predict POD and POCD in elder patients undergoing hip fracture surgery.

Serum and urinary thioredoxin concentrations are associated with severity of children hydronephrosis.

BACKGROUND: Ureteropelvic junction obstruction (UPJO) is the most common cause of hydronephrosis in children. This study was to assess the relationship between serum thioredoxin (S-Trx) and urinary thioredoxin (U-Trx) concentrations and severity of children hydronephrosis caused by UPJO. METHODS: This study included 156 hydronephrosis children with unilateral UPJO and 80 healthy children. S-Trx and U-Trx concentrations were measured using enzyme-linked immunosorbent assay. U-Trx/creatinine (cr) ratio was calculated. RESULTS: S-Trx and U-Trx concentrations and U-Trx/cr ratio were significantly higher in hydronephrosis children than in healthy children. They were significantly correlated with split renal function, anterior-posterior diameter and Society for Fetal Urology classification, as well as were independently related to the split renal function <39.2%, anterior-posterior diameter>30mm and Society for Fetal Urology grade IV. Under receiver operating characteristic curves, U-Trx/cr ratio showed the higher predictive value compared to S-Trx and U-Trx concentrations. CONCLUSION: Increased S-Trx and U-Trx concentrations, especially U-Trx/cr ratio, are closely associated with the severity of children hydronephrosis, substantializing Trx as a promising biomarker for the progression of children hydronephrosis.