Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 201
Filtrar
1.
J Nutr ; 2021 Sep 29.
Artigo em Inglês | MEDLINE | ID: mdl-34590119

RESUMO

BACKGROUND: Obesity increases the colorectal cancer risk, in part by elevating colonic proinflammatory cytokines. Curcumin (CUR) and supplemental vitamin B-6 each suppress colonic inflammation. OBJECTIVES: We examined whether the combination of CUR and vitamin B-6 amplifies each supplement's effects and thereby suppress obesity-promoted tumorigenesis. METHODS: Male Friend Virus B (FVB) mice (4-week-old; n = 110) received 6 weekly injections of azoxymethane beginning 1 week after arrival. Thereafter, they were randomized to receive a low-fat diet (10% energy from fat), a high-fat diet (HFD; 60% energy from fat), a HFD containing 0.2% CUR, a HFD containing supplemental vitamin B-6 (24 mg pyridoxine HCl/kg), or a HFD containing both CUR and supplemental vitamin B-6 (C + B) for 15 weeks. Colonic inflammation, assessed by fecal calprotectin, and tumor metrics were the primary endpoints. The anti-inflammatory efficacy of the combination was also determined in human colonic organoids. RESULTS: HFD-induced obesity produced a 2.6-fold increase in plasma IL-6 (P < 0.02), a 1.9-fold increase in fecal calprotectin (P < 0.05), and a 2.2-fold increase in tumor multiplicity (P < 0.05). Compared to the HFD group, the C + B combination, but not the individual agents, decreased fecal calprotectin (66%; P < 0.01) and reduced tumor multiplicity and the total tumor burden by 60%-80% (P < 0.03) in an additive fashion. The combination of C + B also significantly downregulated colonic phosphatidylinositol-4,5-bisphosphate 3-kinase, Wnt, and NF-κB signaling by 31%-47% (P < 0.05), effects largely absent with the single agents. Observations that may explain how the 2 agents work additively include a 2.8-fold increased colonic concentration of 3-hydroxyanthranillic acid (P < 0.05) and a 1.3-fold higher colonic concentration of the active coenzymatic form of vitamin B-6 (P < 0.05). In human colonic organoids, micromolar concentrations of CUR, vitamin B-6, and their combination suppressed secreted proinflammatory cytokines by 41%-93% (P < 0.03), demonstrating relevance to humans. CONCLUSIONS: In this mouse model, C + B is superior to either agent alone in preventing obesity-promoted colorectal carcinogenesis. Augmented suppression of procancerous signaling pathways may be the means by which this augmentation occurs.

2.
J Nutr Sci ; 10: e57, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34422259

RESUMO

The demand for cobalamin (vitamin B12) and folate is increased during pregnancy, and deficiency during pregnancy may lead to complications and adverse outcomes. Yet, the status of these micronutrients is unknown in many populations. We assessed the concentration of cobalamin, folate and their functional biomarkers, total homocysteine (tHcy) and methylmalonic acid (MMA), in 561 pregnant women enrolled in a community-based randomised controlled trial in Bhaktapur, Nepal. Plasma concentrations of cobalamin, folate, tHcy and MMA were measured and a combined indicator of vitamin B12 status (3cB12) was calculated. We report mean or median concentrations and the prevalence of deficiency according to commonly used cut-offs, and assessed their association with indicators of socio-economic status, and maternal and dietary characteristics by linear regression. Among the women at gestational week less than 15, deficiencies of cobalamin and folate were seen in 24 and 1 %, respectively. Being a vegetarian was associated with lower plasma cobalamin, and a higher socio-economic status was associated with a better micronutrient status. We conclude that cobalamin deficiency defined by commonly used cut-offs was common in Nepalese women in early pregnancy. In contrast, folate deficiency was rare. As there is no consensus on cut-off points for vitamin B12 deficiency during pregnancy, future studies are needed to assess the potential functional consequences of these low values.

3.
Diabetologia ; 64(11): 2445-2457, 2021 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-34409496

RESUMO

AIMS/HYPOTHESIS: Studies investigating associations between kynurenines and cognitive function have generally been small, restricted to clinical samples or have found inconsistent results, and associations in the general adult population, and in individuals with type 2 diabetes in particular, are not clear. Therefore, the aim of the present study was to investigate cross-sectional associations between plasma kynurenines and cognitive function in a cohort of middle-aged participants with normal glucose metabolism, prediabetes (defined as impaired fasting glucose and/or impaired glucose tolerance) and type 2 diabetes. METHODS: Plasma kynurenines were quantified in 2358 participants aged 61 ± 8 years. Cross-sectional associations of kynurenines with cognitive impairment and cognitive domain scores were investigated using logistic, multiple linear and restricted cubic spline regression analyses adjusted for several confounders. RESULTS: Effect modification by glucose metabolism status was found for several associations with cognitive impairment, hence analyses were stratified. In individuals with prediabetes, 3-hydroxykynurenine (OR per SD 0.59 [95% CI 0.37, 0.94]) and 3-hydroxyanthranilic acid (0.67 [0.47, 0.96]) were associated with lower odds of cognitive impairment after full adjustment. In individuals with type 2 diabetes, kynurenine (0.80 [0.66, 0.98]), 3-hydroxykynurenine (0.82 [0.68, 0.99]), kynurenic acid (0.81 [0.68, 0.96]), xanthurenic acid (0.73 [0.61, 0.87]) and 3-hydroxyanthranilic acid (0.73 [0.60, 0.87]) were all associated with lower odds of cognitive impairment. Kynurenic acid (ß per SD 0.07 [95% CI 0.02, 0.13]) and xanthurenic acid (0.06 [0.01, 0.11]) were also associated with better executive function/attention. No associations were observed in individuals with normal glucose metabolism. CONCLUSIONS/INTERPRETATION: Several kynurenines were cross-sectionally associated with lower odds of cognitive impairment and better cognitive functioning in type 2 diabetes, while less widespread associations were seen in prediabetes. Low levels of kynurenines might be involved in the pathway of type 2 diabetes and cognitive decline but this needs further studies.

4.
J Nutr ; 151(10): 2908-2916, 2021 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-34320210

RESUMO

BACKGROUND: Nutritional epidemiology research using self-reported dietary intake is prone to measurement error. Objective methods are being explored to overcome this limitation. OBJECTIVES: We aimed to examine 1) the association between plasma markers related to inflammation and derive marker scores for dietary patterns [Mediterranean dietary score (MDS), energy-adjusted Dietary Inflammatory Index (E-DIITM), Alternative Healthy Eating Index 2010 (AHEI)] and 2) the associations of these marker scores with mortality. METHODS: Weighted marker scores were derived from the cross-sectional association between 30 plasma markers and each dietary score (assessed using food-frequency questionnaires) using linear regression for 770 participants in the Melbourne Collaborative Cohort Study (aged 50-82 y). Prospective associations between marker scores and mortality (n = 249 deaths) were assessed using Cox regression (median follow-up: 14.4 y). RESULTS: The MDS, E-DII, and AHEI were associated (P < 0.05) with 9, 14, and 11 plasma markers, respectively. Healthier diets (higher MDS and AHEI, and lower anti-inflammatory, E-DII) were associated with lower concentrations of kynurenines, neopterin, IFN-γ, cytokines, and C-reactive protein. Five of 6 markers common to the 3 dietary scores were components of the kynurenine pathway. The 3 dietary-based marker scores were highly correlated (Spearman ρ: -0.74, -0.82, and 0.93). Inverse associations (for 1-SD increment) were observed with all-cause mortality for the MDS marker score (HR: 0.84; 95% CI: 0.72-0.98) and the AHEI marker score (HR: 0.76; 95% CI: 0.66-0.89), whereas a positive association was observed with the E-DII marker score (HR: 1.18; 95% CI: 1.01-1.39). The same magnitude of effect was not observed for the respective dietary patterns. CONCLUSIONS: Markers involved in inflammation-related processes are associated with dietary quality, including a substantial overlap between markers associated with the MDS, the E-DII, and the AHEI, especially kynurenines. Unfavorable marker scores, reflecting poorer-quality diets, were associated with increased mortality.

5.
Sci Rep ; 11(1): 13805, 2021 07 05.
Artigo em Inglês | MEDLINE | ID: mdl-34226613

RESUMO

Imbalances of blood biomarkers are associated with disease, and biomarkers may also vary non-pathologically across population groups. We described variation in concentrations of biomarkers of one-carbon metabolism, vitamin status, inflammation including tryptophan metabolism, and endothelial and renal function among cancer-free older adults. We analyzed 5167 cancer-free controls aged 40-80 years from 20 cohorts in the Lung Cancer Cohort Consortium (LC3). Centralized biochemical analyses of 40 biomarkers in plasma or serum were performed. We fit multivariable linear mixed effects models to quantify variation in standardized biomarker log-concentrations across four factors: age, sex, smoking status, and body mass index (BMI). Differences in most biomarkers across most factors were small, with 93% (186/200) of analyses showing an estimated difference lower than 0.25 standard-deviations, although most were statistically significant due to large sample size. The largest difference was for creatinine by sex, which was - 0.91 standard-deviations lower in women than men (95%CI - 0.98; - 0.84). The largest difference by age was for total cysteine (0.40 standard-deviation increase per 10-year increase, 95%CI 0.36; 0.43), and by BMI was for C-reactive protein (0.38 standard-deviation increase per 5-kg/m2 increase, 95%CI 0.34; 0.41). For 31 of 40 markers, the mean difference between current and never smokers was larger than between former and never smokers. A statistically significant (p < 0.05) association with time since smoking cessation was observed for 8 markers, including C-reactive protein, kynurenine, choline, and total homocysteine. We conclude that most blood biomarkers show small variations across demographic characteristics. Patterns by smoking status point to normalization of multiple physiological processes after smoking cessation.

6.
Artigo em Inglês | MEDLINE | ID: mdl-34117761

RESUMO

BACKGROUND: Inflammation is a key feature of aging. We aimed to i) investigate the association of 34 blood markers potentially involved in inflammatory processes with age and mortality, ii) develop a signature of 'inflammaging'. METHODS: Thirty-four blood markers relating to inflammation, B vitamin status and the kynurenine pathway were measured in 976 participants in the Melbourne Collaborative Cohort Study at baseline (median age=59 years) and follow-up (median age=70 years). Associations with age and mortality were assessed using linear and Cox regression, respectively. A parsimonious signature of inflammaging was developed and its association with mortality was compared with two marker scores calculated across all markers associated with age and mortality, respectively. RESULTS: The majority of markers (30/34) were associated with age, with stronger associations observed for neopterin, cystatin C, IL-6, TNF-α, several markers of the kynurenine pathway and derived indices KTR (kynurenine/tryptophan ratio), PAr index (ratio of 4-pyridoxic acid and the sum of pyridoxal 5´-phosphate and pyridoxal), and HK:XA (3-hydroxykynurenine/xanthurenic acid ratio). Many markers (17/34) showed an association with mortality, in particular IL-6, neopterin, CRP, quinolinic acid, PAr index, and KTR. The inflammaging signature included ten markers and was strongly associated of mortality (HR per SD=1.40, 95%CI:1.24-1.57, P=2x10 -8), similar to scores based on all age-associated (HR=1.38, 95%CI:1.23-1.55, P=4x10 -8) and mortality-associated markers (HR=1.43, 95%CI:1.28-1.60, P=1x10 -10), respectively. Strong evidence of replication of the inflammaging signature association with mortality was found in the Hordaland Health Study. CONCLUSION: Our study highlights the key role of the kynurenine pathway and vitamin B6 catabolism in aging, along with other well-established inflammation-related markers. A signature of inflammaging based on ten markers was strongly associated with mortality.

7.
J Nutr ; 151(8): 2134-2141, 2021 Aug 07.
Artigo em Inglês | MEDLINE | ID: mdl-33978160

RESUMO

BACKGROUND: Biomarkers such as omega-3 (n-3) PUFAs, urinary iodine concentration (UIC), 1-methylhistidine (1-MH), and trimethylamine N-oxide (TMAO) have been associated with fish intake in observational studies, but data from children in randomized controlled trials are limited. OBJECTIVES: The objective of this exploratory analysis was to investigate the effects of fatty fish intake compared with meat intake on various biomarkers in preschool children. METHODS: We randomly allocated (1:1) 232 children, aged 4 to 6 y, from 13 kindergartens. The children received lunch meals of either fatty fish (herring/mackerel) or meat (chicken/lamb/beef) 3 times a week for 16 wk. We analyzed 86 biomarkers in plasma (n = 207), serum (n = 195), RBCs (n = 211), urine (n = 200), and hair samples (n = 210). We measured the effects of the intervention on the normalized biomarker concentrations in linear mixed-effect regression models taking the clustering within the kindergartens into account. The results are presented as standardized effect sizes. RESULTS: We found significant effects of the intervention on the following biomarkers: RBC EPA (20:5n-3), 0.61 (95% CI: 0.36, 0.86); DHA (22:6n-3), 0.43 (95% CI: 0.21, 0.66); total n-3 PUFAs, 0.41 (95% CI: 0.20, 0.64); n-3/n-6 ratio, 0.48 (95% CI: 0.24, 0.71); adrenic acid (22:4n-6, -0.65 (95% CI: -0.91, -0.40), arachidonic acid (20:4n-6), -0.54 (95% CI: -0.79, -0.28); total n-6 PUFAs, -0.31 (95% CI: -0.56, -0.06); UIC, 0.32 (95% CI: 0.052, 0.59); hair mercury, 0.83 (95% CI: 0.05, 1.05); and plasma 1-MH, -0.35 (95% CI: -0.61, -0.094). CONCLUSIONS: Of the 86 biomarkers, the strongest effect of fatty fish intake was on n-3 PUFAs, UIC, hair mercury, and plasma 1-MH. We observed no or limited effects on biomarkers related to micronutrient status, inflammation, or essential amino acid, choline oxidation, and tryptophan pathways.The trial was registered at clinicaltrials.gov (NCT02331667).

8.
Anal Chem ; 93(21): 7616-7624, 2021 06 01.
Artigo em Inglês | MEDLINE | ID: mdl-34014078

RESUMO

In mass spectrometry, reliable quantification requires correction for variations in ionization efficiency between samples. The preferred method is the addition of a stable isotope-labeled internal standard (SIL-IS). In targeted metabolomics, a dedicated SIL-IS for each metabolite of interest may not always be realized due to high cost or limited availability. We recently completed the analysis of more than 70 biomarkers, each with a matching SIL-IS, across four mass spectrometry-based platforms (one GC-MS/MS and three LC-MS/MS). Using data from calibrator and quality control samples added to 60 96-well trays (analytical runs), we calculated analytical precision (CV) retrospectively. The use of integrated peak areas for all metabolites and internal standards allowed us to calculate precision for all matching analyte (A)/SIL-IS (IS) pairs as well as for all nonmatching A/IS pairs within each platform (total n = 1442). The median between-run precision for matching A/IS across the four platforms was 2.7-5.9%. The median CV for nonmatching A/IS (corresponding to pairing analytes with a non-SIL-IS) was 2.9-10.7 percentage points higher. Across all platforms, CVs for nonmatching A/IS increased with increasing difference in retention time (Spearman's rho of 0.17-0.93). The CV difference for nonmatching vs matching A/IS was often, but not always, smaller when analytes and internal standards were close structural analogs.


Assuntos
Metabolômica , Espectrometria de Massas em Tandem , Cromatografia Líquida , Cromatografia Gasosa-Espectrometria de Massas , Padrões de Referência , Estudos Retrospectivos
9.
Cleft Palate Craniofac J ; 58(5): 567-576, 2021 05.
Artigo em Inglês | MEDLINE | ID: mdl-33686867

RESUMO

BACKGROUND AND OBJECTIVE: The causal role of maternal nutrition in orofacial clefts is uncertain. We tested hypotheses that low maternal vitamin B12 and low folate status are each associated with an increased risk of isolated cleft lip with or without cleft palate (CL±P) in a case-control study in Tamil Nadu state, India. METHODS: Case-mothers of CL±P children (n = 47) and control-mothers of unaffected children (n = 50) were recruited an average of 1.4 years after birth of the index child and plasma vitamin B12, methylmalonic acid (MMA), total homocysteine (tHcy), and folate were measured at that time. Logistic regression analyses estimated associations between nutrient biomarkers and case-control status. RESULTS: Odds ratios (ORs) contrasting biomarker levels showed associations between case-mothers and low versus high plasma vitamin B12 (OR = 2.48, 95% CI, 1.02-6.01) and high versus low plasma MMA, an indicator of poor B12 status (OR = 3.65 95% CI, 1.21-11.05). Case-control status was not consistently associated with folate or tHcy levels. Low vitamin B12 status, when defined by a combination of both plasma vitamin B12 and MMA levels, had an even stronger association with case-mothers (OR = 6.54, 95% CI, 1.33-32.09). CONCLUSIONS: Mothers of CL±P children in southern India were 6.5 times more likely to have poor vitamin B12 status, defined by multiple biomarkers, compared to control-mothers. Further studies in populations with diverse nutritional backgrounds are required to determine whether poor maternal vitamin B12 or folate levels or their interactions are causally related to CL±P.


Assuntos
Fenda Labial , Fissura Palatina , Estudos de Casos e Controles , Criança , Fenda Labial/epidemiologia , Fissura Palatina/epidemiologia , Feminino , Ácido Fólico , Humanos , Índia/epidemiologia , Fatores de Risco , Vitamina B 12 , Vitaminas
10.
Eur J Prev Cardiol ; 2021 Mar 08.
Artigo em Inglês | MEDLINE | ID: mdl-33709106

RESUMO

AIMS : Blockade of ß-adrenoceptors reduces sympathetic nervous system activity and improves survival in patients with heart failure with reduced left ventricular ejection fraction (HFrEF); however, any improvement in longevity among patients with coronary heart disease (CHD) but without HFrEF remains uncertain. Vitamin A has been linked to the activation of tyrosine hydroxylase, the rate-limiting enzyme in the catecholamine synthesis pathway. We investigated if vitamin A status modified the association of ß-blocker use with the risk of all-cause mortality. METHODS AND RESULTS : A total of 4118 patients undergoing elective coronary angiography for suspected stable angina pectoris, of whom the majority had normal left ventricular ejection fraction (LVEF) were studied. Hazard ratios (HRs) of all-cause mortality comparing treatment vs. non-treatment of ß-blockers according to the tertiles of serum vitamin A were explored in Cox proportional hazards regression models. During a median follow-up of 10.3 years, 897 patients (21.8%) died. The overall LVEF was 65% and 283 (6.9%) had anamnestic HF. After multivariable adjustments for traditional risk factors, medical history, and drug therapies of cardiovascular disease, ß-blocker treatment was inversely associated with the risk of all-cause mortality [HR : 0.84; 95% CI (confidence interval), 0.72-0.97]. However, the inverse association was generally stronger among patients in the upper serum vitamin A tertile (HR :0.66; 95% CI, 0.50-0.86; Pinteraction = 0.012), which remained present after excluding patients with LVEF < 40%. CONCLUSION : In patients with suspected CHD, ß-blocker treatment was associated with improved survival primarily among patients with high serum vitamin A levels.

11.
Am J Clin Nutr ; 113(6): 1468-1481, 2021 06 01.
Artigo em Inglês | MEDLINE | ID: mdl-33668069

RESUMO

BACKGROUND: B vitamins have been associated with the risk and progression of colorectal cancer (CRC), given their central roles in nucleotide synthesis and methylation, yet their association with quality of life in established CRC is unclear. OBJECTIVES: To investigate whether quality of life 6 months postdiagnosis is associated with: 1) circulating concentrations of B vitamins and related biomarkers 6 months postdiagnosis; 2) changes in these concentrations between diagnosis and 6 months postdiagnosis; 3) B-vitamin supplement use 6 months postdiagnosis; and 4) changes in B-vitamin supplement use between diagnosis and 6 months postdiagnosis. METHODS: We included 1676 newly diagnosed stage I-III CRC patients from 3 prospective European cohorts. Circulating concentrations of 9 biomarkers related to the B vitamins folate, riboflavin, vitamin B6, and cobalamin were measured at diagnosis and 6 months postdiagnosis. Information on dietary supplement use was collected at both time points. Health-related quality of life (global quality of life, functioning scales, and fatigue) was assessed by the European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire 6 months postdiagnosis. Confounder-adjusted linear regression analyses were performed, adjusted for multiple testing. RESULTS: Higher pyridoxal 5'-phosphate (PLP) was cross-sectionally associated with better physical, role, and social functioning, as well as reduced fatigue, 6 months postdiagnosis. Associations were observed for a doubling in the hydroxykynurenine ratio [3-hydroxykynurenine: (kynurenic acid + xanthurenic acid + 3-hydroxyanthranilic acid + anthranilic acid); an inverse marker of vitamin B6] and both reduced global quality of life (ß = -3.62; 95% CI: -5.88, -1.36) and worse physical functioning (ß = -5.01; 95% CI: -7.09, -2.94). Dose-response relations were observed for PLP and quality of life. No associations were observed for changes in biomarker concentrations between diagnosis and 6 months. Participants who stopped using B-vitamin supplements after diagnosis reported higher fatigue than nonusers. CONCLUSIONS: Higher vitamin B6 status was associated with better quality of life, yet limited associations were observed for the use of B-vitamin supplements. Vitamin B6 needs further study to clarify its role in relation to quality of life.


Assuntos
Neoplasias Colorretais/patologia , Suplementos Nutricionais , Qualidade de Vida , Complexo Vitamínico B/sangue , Idoso , Biomarcadores/sangue , Estudos de Coortes , Europa (Continente) , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Análise Multivariada
12.
Scand J Gastroenterol ; 56(4): 443-452, 2021 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-33583308

RESUMO

BACKGROUND AND AIMS: Biomarkers of inflammation may be of clinical utility in primary sclerosing cholangitis (PSC). We aimed to investigate the interferon gamma-related biomarkers neopterin and kynurenine-tryptophanratio (KT-ratio) in PSC. METHODS: Circulating neopterin, tryptophan and kynurenine were measured with LC-MS/MS in multiple cross-sectional cohorts comprising in total of 524 PSC patients and 100 healthy controls from Norway, Germany and Sweden. RESULTS: Neopterin and KT-ratio were significantly increased in PSC patients compared with controls in both a discovery and a validation cohort from Norway. Furthermore, high neopterin and KT-ratio levels were associated with a shorter transplantation-free survival in the PSC patients in the Norwegian discovery cohort and the German validation cohort. However, in the validation PSC cohort from Sweden, no relationship between neopterin and KT-ratio and liver transplantation-free survival was observed. The correlations between neopterin and KT-ratio were moderate to strong and similar in all cohorts (rho 0.50-0.67). Neopterin and KT-ratio also correlated with C-reactive protein (rho 0.17-0.63) and revised Mayo risk score (rho 0.23-0.42) in all cohorts. CONCLUSIONS: Neopterin and KT-ratio were elevated in PSC and associated with liver transplantation-free survival in two independent PSC cohorts, highlighting a possible role of interferon gamma-driven inflammation in the pathogenesis. However, the lack of association with survival in one of the cohorts reduces the potential clinical value of neopterin and KT-ratioas biomarkers and highlights the need to validate new biomarkers in PSC in multiple cohorts.


Assuntos
Colangite Esclerosante , Cinurenina , Biomarcadores , Cromatografia Líquida , Estudos Transversais , Humanos , Neopterina , Espectrometria de Massas em Tandem , Triptofano
13.
J Acquir Immune Defic Syndr ; 87(2): e177-e181, 2021 06 01.
Artigo em Inglês | MEDLINE | ID: mdl-33633032

RESUMO

BACKGROUND: People living with HIV have increased risk of depression compared with uninfected controls. The determinants of this association are unclear. Alterations in kynurenine (Kyn) metabolism have been associated with depression in uninfected individuals, but whether they are involved in the development of depression in the context of HIV infection is unknown. METHODS: A total of 909 people living with HIV were recruited from the Copenhagen Comorbidity in HIV infection study. Information regarding demographics and depression was obtained from questionnaires. HIV-related variables and use of antidepressant medication were collected from patient records. Logistic regression models before and after adjustment for confounders were used to test our hypotheses. RESULTS: The prevalence of depression was 11%. Among traditional risk factors, only being unmarried was associated with greater odds of depression. Higher levels of quinolinic-to-kynurenic acid ratio (P = 0.018) and higher concentrations of quinolinic acid (P = 0.048) were found in individuals with depression than in those without. After adjusting for confounders, high levels of quinolinic-to-kynurenic acid ratio and high concentrations of quinolinic acid remained associated with depression [adjusted odds ratio 1.61 (1.01; 2.59) and adjusted odds ratio 1.68 (1.02; 2.77), respectively]. CONCLUSIONS: The results from this study suggest that alterations in the kynurenine pathway of tryptophan metabolism are associated with the presence of depression in the context of HIV infection.


Assuntos
Depressão/epidemiologia , Infecções por HIV/psicologia , Cinurenina/sangue , Ácido Quinolínico/sangue , Triptofano/metabolismo , Antidepressivos/uso terapêutico , Comorbidade , Depressão/tratamento farmacológico , Depressão/psicologia , Feminino , Infecções por HIV/patologia , Humanos , Cinurenina/metabolismo , Masculino , Pessoa de Meia-Idade , Psicometria
14.
Gastroenterology ; 160(5): 1784-1798.e0, 2021 04.
Artigo em Inglês | MEDLINE | ID: mdl-33387530

RESUMO

BACKGROUND & AIMS: To influence host and disease phenotype, compositional microbiome changes, which have been demonstrated in patients with primary sclerosing cholangitis (PSC), must be accompanied by functional changes. We therefore aimed to characterize the genetic potential of the gut microbiome in patients with PSC compared with healthy controls (HCs) and patients with inflammatory bowel disease (IBD). METHODS: Fecal DNA from 2 cohorts (1 Norwegian and 1 German), in total comprising 136 patients with PSC (58% with IBD), 158 HCs, and 93 patients with IBD without PSC, were subjected to metagenomic shotgun sequencing, generating 17 billion paired-end sequences, which were processed using HUMAnN2 and MetaPhlAn2, and analyzed using generalized linear models and random effects meta-analyses. RESULTS: Patients with PSC had fewer microbial genes compared with HCs (P < .0001). Compared with HCs, patients with PSC showed enrichment and increased prevalence of Clostridium species and a depletion of, for example, Eubacterium spp and Ruminococcus obeum. Patients with PSC showed marked differences in the abundance of genes related to vitamin B6 synthesis and branched-chain amino acid synthesis (Qfdr < .05). Targeted metabolomics of plasma from an independent set of patients with PSC and controls found reduced concentrations of vitamin B6 and branched-chain amino acids in PSC (P < .0001), which strongly associated with reduced liver transplantation-free survival (log-rank P < .001). No taxonomic or functional differences were detected between patients with PSC with and without IBD. CONCLUSIONS: The gut microbiome in patients with PSC exhibits large functional differences compared with that in HCs, including microbial metabolism of essential nutrients. Alterations in related circulating metabolites associated with disease course, suggesting that microbial functions may be relevant for the disease process in PSC.


Assuntos
Bactérias/metabolismo , Colangite Esclerosante/microbiologia , Microbioma Gastrointestinal , Metaboloma , Metagenoma , Adolescente , Adulto , Idoso , Bactérias/genética , Estudos de Casos e Controles , Colangite Esclerosante/sangue , Colangite Esclerosante/diagnóstico , Colangite Esclerosante/cirurgia , Estudos Transversais , Disbiose , Fezes/microbiologia , Feminino , Alemanha , Humanos , Transplante de Fígado , Masculino , Metabolômica , Metagenômica , Pessoa de Meia-Idade , Noruega , Filogenia , Intervalo Livre de Progressão , Adulto Jovem
15.
J Nutr ; 151(4): 883-891, 2021 04 08.
Artigo em Inglês | MEDLINE | ID: mdl-33484134

RESUMO

BACKGROUND: One-carbon metabolism (OCM) refers to the transfer of methyl groups central to DNA methylation and histone modification. Insufficient access to methyl donors and B-vitamin cofactors affects epigenetic maintenance and stability, and when occurring in early life may impact future health and neurodevelopment. OBJECTIVE: The objective of this study was to examine the relative associations between one-carbon metabolites in Nepalese mother-infant pairs and child cognition measured at 5 y of age. METHODS: This is a cross-sectional study from Bhaktapur, Nepal, in a population at high risk of subclinical B-vitamin deficiencies and cumulative infection burden. Venous blood samples from 500 mother-infant pairs were collected when the infants were 2 to 12 mo old, and metabolite concentrations measured by microbiological assays and GC-tandem MS. We re-enrolled 321 of these children at 5 y and assessed cognition by the Ages and Stages Questionnaire, 3rd edition, and subtests from the Developmental Neuropsychological Assessment, 2nd edition (NEPSY-II). The associations of the independent metabolites or unobserved metabolic phenotypes (identified by latent class analysis) with the cognitive outcomes were estimated by seemingly unrelated regression. We explored direct and indirect relations between the OCM pathway and the cognitive outcomes using path analysis. RESULTS: Infant cystathionine concentration was inversely associated with 4 cognitive outcomes (standardized ßs ranging from -0.22 to -0.11, P values from <0.001 to 0.034). Infants with a metabolic phenotype indicating impaired OCM and low vitamin B-12 status had poorer cognitive outcomes compared with infants with normal OCM activity and adequate vitamin B-12 status (standardized ßs ranging from -0.80 to -0.40, P < 0.001 and 0.05). In the path analysis, we found several OCM biomarkers were associated with affect recognition through infant plasma cystathionine. CONCLUSIONS: Elevated plasma cystathionine during infancy reflects a metabolic phenotype of impaired OCM and low vitamin B-12 status and is associated with poorer cognitive function when the children are 5 y old.


Assuntos
Carbono/metabolismo , Desenvolvimento Infantil/fisiologia , Cognição/fisiologia , Adolescente , Adulto , Biomarcadores/sangue , Pré-Escolar , Estudos Transversais , Cistationina/sangue , Metilação de DNA , Feminino , Código das Histonas , Humanos , Lactente , Análise de Classes Latentes , Masculino , Pessoa de Meia-Idade , Mães , Nepal , Fenótipo , Vitamina B 12/sangue , Deficiência de Vitamina B 12/sangue , Deficiência de Vitamina B 12/psicologia , Adulto Jovem
16.
PLoS Med ; 17(12): e1003430, 2020 12.
Artigo em Inglês | MEDLINE | ID: mdl-33259482

RESUMO

BACKGROUND: Vitamin B12 deficiency is common and affects cell division and differentiation, erythropoiesis, and the central nervous system. Several observational studies have demonstrated associations between biomarkers of vitamin B12 status with growth, neurodevelopment, and anemia. The objective of this study was to measure the effects of daily supplementation of vitamin B12 for 1 year on neurodevelopment, growth, and hemoglobin concentration in infants at risk of deficiency. METHODS AND FINDINGS: This is a community-based, individually randomized, double-blind placebo-controlled trial conducted in low- to middle-income neighborhoods in Bhaktapur, Nepal. We enrolled 600 marginally stunted, 6- to 11-month-old infants between April 2015 and February 2017. Children were randomized in a 1:1 ratio to 2 µg of vitamin B12, corresponding to approximately 2 to 3 recommended daily allowances (RDAs) or a placebo daily for 12 months. Both groups were also given 15 other vitamins and minerals at around 1 RDA. The primary outcomes were neurodevelopment measured by the Bayley Scales of Infant and Toddler Development 3rd ed. (Bayley-III), attained growth, and hemoglobin concentration. Secondary outcomes included the metabolic response measured by plasma total homocysteine (tHcy) and methylmalonic acid (MMA). A total of 16 children (2.7%) in the vitamin B12 group and 10 children (1.7%) in the placebo group were lost to follow-up. Of note, 94% of the scheduled daily doses of vitamin B12 or placebo were reported to have been consumed (in part or completely). In this study, we observed that there were no effects of the intervention on the Bayley-III scores, growth, or hemoglobin concentration. Children in both groups grew on an average 12.5 cm (SD: 1.8), and the mean difference was 0.20 cm (95% confidence interval (CI): -0.23 to 0.63, P = 0.354). Furthermore, at the end of the study, the mean difference in hemoglobin concentration was 0.02 g/dL (95% CI: -1.33 to 1.37, P = 0.978), and the difference in the cognitive scaled scores was 0.16 (95% CI: -0.54 to 0.87, P = 0.648). The tHcy and MMA concentrations were 23% (95% CI: 17 to 30, P < 0.001) and 30% (95% CI: 15 to 46, P < 0.001) higher in the placebo group than in the vitamin B12 group, respectively. We observed 43 adverse events in 36 children, and these events were not associated with the intervention. In addition, 20 in the vitamin B12 group and 16 in the placebo group were hospitalized during the supplementation period. Important limitations of the study are that the strict inclusion criteria could limit the external validity and that the period of vitamin B12 supplementation might not have covered a critical window for infant growth or brain development. CONCLUSIONS: In this study, we observed that vitamin B12 supplementation in young children at risk of vitamin B12 deficiency resulted in an improved metabolic response but did not affect neurodevelopment, growth, or hemoglobin concentration. Our results do not support widespread vitamin B12 supplementation in marginalized infants from low-income countries. TRIAL REGISTRATION: ClinicalTrials.gov NCT02272842 Universal Trial Number: U1111-1161-5187 (September 8, 2014) Trial Protocol: Original trial protocol: PMID: 28431557 (reference [18]; study protocols and plan of analysis included as Supporting information).


Assuntos
Desenvolvimento Infantil , Suplementos Nutricionais , Sistema Nervoso/efeitos dos fármacos , Deficiência de Vitamina B 12/prevenção & controle , Vitamina B 12/administração & dosagem , Fatores Etários , Biomarcadores/sangue , Suplementos Nutricionais/efeitos adversos , Método Duplo-Cego , Feminino , Hemoglobinas/metabolismo , Humanos , Lactente , Masculino , Nepal , Sistema Nervoso/crescimento & desenvolvimento , Recomendações Nutricionais , Fatores de Tempo , Resultado do Tratamento , Vitamina B 12/efeitos adversos , Deficiência de Vitamina B 12/diagnóstico , Deficiência de Vitamina B 12/fisiopatologia
17.
Nutrients ; 12(10)2020 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-33076294

RESUMO

High-quality protein has been associated with child growth; however, the role of the amino acid cysteine remains unclear. The aim was to measure the extent to which plasma total cysteine (tCys) concentration is associated with anthropometric status in children aged 6-30 months living in New Delhi, India. The study was a prospective cohort study including 2102 children. We calculated Z-scores for height-for-age (HAZ), weight-for-height (WHZ), or weight-for-age (WAZ) according to the WHO Child Growth Standards. We used multiple regression models to estimate the association between tCys and the anthropometric indices. A high proportion of the children were categorized as malnourished at enrolment; 41% were stunted (HAZ ≤ -2), 19% were wasted (WHZ ≤ -2) and 42% underweight (WAZ ≤ -2). Plasma total cysteine (tCys) was significantly associated with HAZ, WHZ and WAZ after adjusting for relevant confounders (p < 0.001). Low tCys (≤25th percentile) was associated with a decrease of 0.28 Z-scores for HAZ, 0.10 Z-scores for WHZ, and 0.21 Z-scores for WAZ compared to being >25th percentile. In young Indian children from low-to-middle socioeconomic neighborhoods, a low plasma total cysteine concentration was associated with an increased risk of poor anthropometric status.


Assuntos
Antropometria , Estatura , Peso Corporal , Desenvolvimento Infantil/fisiologia , Transtornos da Nutrição Infantil/diagnóstico , Fenômenos Fisiológicos da Nutrição Infantil/fisiologia , Cisteína/sangue , Fatores Etários , Grupo com Ancestrais do Continente Asiático , Biomarcadores/sangue , Pré-Escolar , Feminino , Humanos , Índia , Lactente , Masculino , Estudos Prospectivos , Risco , Fatores Socioeconômicos
18.
Nutrients ; 12(9)2020 Sep 17.
Artigo em Inglês | MEDLINE | ID: mdl-32957568

RESUMO

Cysteine is a semi-essential amino acid that has been positively associated with growth in children. However, transgenerational effects remain unclear. The aim of this analysis was to assess whether maternal plasma total cysteine (tCys) concentration is associated with various growth indicators in infants living in peri-urban settings in Bhaktapur, Nepal. We used data from the 561 mothers enrolled in an ongoing randomized controlled trial. We built linear regression models to evaluate the associations between maternal tCys and birth weight, length-for-age Z-scores (LAZ) and weight-for-length Z-scores (WLZ) at birth and six months of age. Maternal tCys was inversely associated with birth weight among boys after adjusting for confounders (p < 0.05). In addition, there was a negative association between maternal tCys and LAZ at birth (p < 0.01). No associations between maternal tCys and the other anthropometric indicators were found significant, although there was a tendency for maternal tCys to be associated positively with WLZ at birth among girls (p < 0.10). This is a first study evaluating transgenerational relation of tCys on growth in infants. Further, larger and more comprehensive studies are needed to determine if and how maternal tCys alters child growth.


Assuntos
Desenvolvimento Infantil , Cisteína/sangue , Adulto , Efeito de Coortes , Feminino , Humanos , Lactente , Modelos Lineares , Análise Multivariada , Nepal , Gravidez , Adulto Jovem
19.
Cancer Prev Res (Phila) ; 13(10): 817-828, 2020 10.
Artigo em Inglês | MEDLINE | ID: mdl-32655010

RESUMO

Obesity and obesity-driven cancer rates are continuing to rise worldwide. We hypothesize that adipocyte-colonocyte interactions are a key driver of obesity-associated cancers. To understand the clinical relevance of visceral adipose tissue in advancing tumor growth, we analyzed paired tumor-adjacent visceral adipose, normal mucosa, and colorectal tumor tissues as well as presurgery blood samples from patients with sporadic colorectal cancer. We report that high peroxisome proliferator-activated receptor gamma (PPARG) visceral adipose tissue expression is associated with glycoprotein VI (GPVI) signaling-the major signaling receptor for collagen-as well as fibrosis and adipogenesis pathway signaling in colorectal tumors. These associations were supported by correlations between PPARG visceral adipose tissue expression and circulating levels of plasma 4-hydroxyproline and serum intercellular adhesion molecule 1 (ICAM1), as well as gene set enrichment analysis and joint gene-metabolite pathway results integration that yielded significant enrichment of genes defining epithelial-to-mesenchymal transition-as in fibrosis and metastasis-and genes involved in glycolytic metabolism, confirmed this association. We also reveal that elevated prostaglandin-endoperoxide synthase 2 (PTGS2) colorectal tumor expression is associated with a fibrotic signature in adipose-tumor crosstalk via GPVI signaling and dendritic cell maturation in visceral adipose tissue. Systemic metabolite and biomarker profiling confirmed that high PTGS2 expression in colorectal tumors is significantly associated with higher concentrations of serum amyloid A and glycine, and lower concentrations of sphingomyelin, in patients with colorectal cancer. This multi-omics study suggests that adipose-tumor crosstalk in patients with colorectal cancer is a critical microenvironment interaction that could be therapeutically targeted.See related spotlight by Colacino et al., p. 803.


Assuntos
Tecido Adiposo , Neoplasias Colorretais , Carcinogênese , Humanos , Gordura Intra-Abdominal , Obesidade , Microambiente Tumoral
20.
Diabetes ; 69(9): 1903-1916, 2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-32586980

RESUMO

Circulating branched-chain amino acids (BCAAs) associate with insulin resistance and type 2 diabetes. 3-Hydroxyisobutyrate (3-HIB) is a catabolic intermediate of the BCAA valine. In this study, we show that in a cohort of 4,942 men and women, circulating 3-HIB is elevated according to levels of hyperglycemia and established type 2 diabetes. In complementary cohorts with measures of insulin resistance, we found positive correlates for circulating 3-HIB concentrations with HOMA2 of insulin resistance, as well as a transient increase in 3-HIB followed by a marked decrease after bariatric surgery and weight loss. During differentiation, both white and brown adipocytes upregulate BCAA utilization and release increasing amounts of 3-HIB. Knockdown of the 3-HIB-forming enzyme 3-hydroxyisobutyryl-CoA hydrolase decreases release of 3-HIB and lipid accumulation in both cell types. Conversely, addition of 3-HIB to white and brown adipocyte cultures increases fatty acid uptake and modulated insulin-stimulated glucose uptake in a time-dependent manner. Finally, 3-HIB treatment decreases mitochondrial oxygen consumption and generation of reactive oxygen species in white adipocytes, while increasing these measures in brown adipocytes. Our data establish 3-HIB as a novel adipocyte-derived regulator of adipocyte subtype-specific functions strongly linked to obesity, insulin resistance, and type 2 diabetes.


Assuntos
Adipócitos Marrons/metabolismo , Adipócitos Brancos/metabolismo , Diabetes Mellitus Tipo 2/metabolismo , Hidroxibutiratos/sangue , Resistência à Insulina/fisiologia , Obesidade/metabolismo , Aminoácidos de Cadeia Ramificada/metabolismo , Biomarcadores/sangue , Composição Corporal/fisiologia , Diferenciação Celular , Diabetes Mellitus Tipo 2/sangue , Feminino , Humanos , Masculino , Obesidade/sangue
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...