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1.
Am J Transplant ; 23(4): 573-576, 2023 04.
Artigo em Inglês | MEDLINE | ID: mdl-36695697

RESUMO

Biliary anastomotic stricture (BAS) is a frequent complication of liver transplantation and is associated with reduced graft survival and patient morbidity. Existing treatments for BAS involve dilation of the stricture though placement of 1 or more catheters for 6 to 24 months yielding limited effectiveness in transplant patients. In this case series, we present preliminary safety and efficacy of a novel percutaneous laser stricturotomy treatment in a cohort of 5 posttransplant patients with BAS refractory to long-term large bore catheterization. In all patients, holmium or thulium laser was used to excise the stricture and promote biliary re-epithelization. There were no periprocedural complications. Technical success was 100% and at mean follow-up time of 22 months, there have been no recurrences. In conclusion, percutaneous laser stricturotomy demonstrates preliminary safety and efficacy in treatment of refractory BAS following liver transplantation.


Assuntos
Colestase , Transplante de Fígado , Humanos , Transplante de Fígado/efeitos adversos , Colestase/etiologia , Colestase/cirurgia , Constrição Patológica/etiologia , Constrição Patológica/cirurgia , Resultado do Tratamento , Cateterismo/efeitos adversos , Estudos Retrospectivos
2.
Am J Transplant ; 23(3): 429-436, 2023 03.
Artigo em Inglês | MEDLINE | ID: mdl-36695699

RESUMO

Solid organ transplantation (SOT) recipients are known to carry an increased risk of malignancy because of long-term immunosuppression. However, the progression of intraductal papillary mucinous neoplasm of the pancreas (IPMN) in this population remains unclear. We performed a systematic review by searching PubMed, Embase, Scopus, and Google Scholar. All studies containing IPMNs in solid organ transplantation recipients were screened. We included 11 studies in our final analysis, totaling 274 patients with IPMNs of the 8213 SOT recipients. The prevalence from 8 studies was 4.7% (95% CI 2.4%-7.7%) in a random-effects model with median study periods of 24 to 220 months. The median rate for all progressions from 10 studies was 20% (range, 0%-88%) within 13 to 41 months of the median follow-up time. By utilizing the results of 3 case-control studies, the relative risk from a random-effects model for progression (worrisome features and high-risk stigmata) of IPMNs was 0.39 (95% CI 0.12-1.31). No adenocarcinoma derived from IPMN was reported in the included studies. Overall, this study indicates that the progression of pretransplant IPMN does not increase drastically compared with the general nontransplant population. However, considering the limited literature, further studies are required for confirmation.


Assuntos
Adenocarcinoma Mucinoso , Carcinoma Ductal Pancreático , Transplante de Órgãos , Neoplasias Intraductais Pancreáticas , Neoplasias Pancreáticas , Humanos , Carcinoma Ductal Pancreático/patologia , Prevalência , Estudos Retrospectivos , Adenocarcinoma Mucinoso/patologia , Neoplasias Pancreáticas/patologia , Pâncreas
3.
Liver Transpl ; 29(2): 164-171, 2023 02 01.
Artigo em Inglês | MEDLINE | ID: mdl-36111606

RESUMO

Living donor liver transplantation (LDLT) can help address the growing organ shortage in the United States, yet little is known about the current practice patterns in the medical evaluation of living liver donors. We conducted a 131-question survey of all 53 active LDLT transplant programs in the United States to assess current LDLT practices. The response rate was 100%. Donor acceptance rate was 0.33 with an interquartile range of 0.33-0.54 across all centers. Areas of high intercenter agreement included minimum age cutoff of 18 years (73.6%) and the exclusion of those with greater than Class 1 obesity (body mass index, 30.0-34.9 m/kg 2 ) (88.4%). Diabetes mellitus was not an absolute exclusion at most centers (61.5%). Selective liver biopsies were performed for steatosis or iron overload on imaging (67.9% and 62.3%, respectively) or for elevated liver enzymes (60.4%). Steatohepatitis is considered an exclusion at most centers (84.9%). The most common hypercoagulable tests performed were factor V Leiden (FVL) (88.5%), protein C (73.1%), protein S (71.2%), antithrombin III (71.2%) and prothrombin gene mutation (65.4%). At 41.5% of centers, donors were allowed to proceed with donation with FVL heterozygote status. Most programs discontinue oral contraceptive pills at least 28 days prior to surgery. At most centers, the need for cardiovascular ischemic risk testing is based on age (73.6%) and the presence of one or more cardiac risk factors (68.0%). Defining areas of practice consensus and variation underscores the need for data generation to develop evidence-based guidance for the evaluation and risk assessment of living liver donors.


Assuntos
Fígado Gorduroso , Hepatopatias , Transplante de Fígado , Doadores Vivos , Obtenção de Tecidos e Órgãos , Humanos , Fígado Gorduroso/diagnóstico , Hepatopatias/diagnóstico , Transplante de Fígado/métodos , Estados Unidos/epidemiologia
4.
Liver Transpl ; 29(7): 724-734, 2023 07 01.
Artigo em Inglês | MEDLINE | ID: mdl-36749288

RESUMO

Perioperative dysfunction of the fibrinolytic system may play a role in adverse outcomes for liver transplant recipients. There is a paucity of data describing the potential impact of the postoperative fibrinolytic system on these outcomes. Our objective was to determine whether fibrinolysis resistance (FR), on postoperative day one (POD-1), was associated with early allograft dysfunction (EAD). We hypothesized that FR, quantified by tissue plasminogen activator thrombelastography, is associated with EAD. Tissue plasminogen activator thrombelastography was performed on POD-1 for 184 liver transplant recipients at a single institution. A tissue plasminogen activator thrombelastography clot lysis at 30 minutes of 0.0% was identified as the cutoff for FR on POD-1. EAD occurred in 32% of the total population. Fifty-nine percent (n=108) of patients were categorized with FR. The rate of EAD was 42% versus 17%, p <0.001 in patients with FR compared with those without, respectively. The association between FR and EAD risk was assessed using multivariable logistic regression after controlling for known risk factors. The odds of having EAD were 2.43 times (95% CI, 1.07-5.50, p =0.03) higher in recipients with FR [model C statistic: 0.76 (95% CI, 0.64-0.83, p <0.001]. An additive effect of receiving a donation after circulatory determination of death graft and having FR in the rate of EAD was observed. Finally, compared with those without FR, recipients with FR had significantly shorter graft survival time ( p =0.03). In conclusion, FR on POD-1 is associated with EAD and decreased graft survival time. Postoperative viscoelastic testing may provide clinical utility in identifying patients at risk for developing EAD, especially for recipients receiving donation after circulatory determination of death grafts.


Assuntos
Transplante de Fígado , Disfunção Primária do Enxerto , Humanos , Transplante de Fígado/efeitos adversos , Ativador de Plasminogênio Tecidual , Aloenxertos , Disfunção Primária do Enxerto/diagnóstico , Disfunção Primária do Enxerto/epidemiologia , Disfunção Primária do Enxerto/etiologia , Fatores de Risco , Sobrevivência de Enxerto , Morte , Estudos Retrospectivos
5.
Liver Transpl ; : 164-171, 2022 Oct 11.
Artigo em Inglês | MEDLINE | ID: mdl-37160068

RESUMO

ABSTRACT: Living donor liver transplantation (LDLT) can help address the growing organ shortage in the United States, yet little is known about the current practice patterns in the medical evaluation of living liver donors. We conducted a 131-question survey of all 53 active LDLT transplant programs in the United States to assess current LDLT practices. The response rate was 100%. Donor acceptance rate was 0.33 with an interquartile range of 0.33-0.54 across all centers. Areas of high intercenter agreement included minimum age cutoff of 18 years (73.6%) and the exclusion of those with greater than Class 1 obesity (body mass index, 30.0-34.9 m/kg 2 ) (88.4%). Diabetes mellitus was not an absolute exclusion at most centers (61.5%). Selective liver biopsies were performed for steatosis or iron overload on imaging (67.9% and 62.3%, respectively) or for elevated liver enzymes (60.4%). Steatohepatitis is considered an exclusion at most centers (84.9%). The most common hypercoagulable tests performed were factor V Leiden (FVL) (88.5%), protein C (73.1%), protein S (71.2%), antithrombin III (71.2%) and prothrombin gene mutation (65.4%). At 41.5% of centers, donors were allowed to proceed with donation with FVL heterozygote status. Most programs discontinue oral contraceptive pills at least 28 days prior to surgery. At most centers, the need for cardiovascular ischemic risk testing is based on age (73.6%) and the presence of one or more cardiac risk factors (68.0%). Defining areas of practice consensus and variation underscores the need for data generation to develop evidence-based guidance for the evaluation and risk assessment of living liver donors.

6.
Hum Genomics ; 14(1): 10, 2020 03 11.
Artigo em Inglês | MEDLINE | ID: mdl-32160915

RESUMO

INTRODUCTION: Metoprolol succinate is a long-acting beta-blocker prescribed for the management of hypertension (HTN) and other cardiovascular diseases. Metabolomics, the study of end-stage metabolites of upstream biologic processes, yield insight into mechanisms of drug effectiveness and safety. Our aim was to determine metabolomic profiles associated with metoprolol effectiveness for the treatment of hypertension. METHODS: We performed a prospective pragmatic trial (NCT02293096) that enrolled patients between 30 and 80 years with uncontrolled HTN. Patients were started on metoprolol succinate at a dose based upon systolic blood pressure (SBP). Urine and blood pressure measurements were collected weekly. Individuals with a 10% decline in SBP or heart rate (HR) were considered responsive. Genotype for the CYP2D6 enzyme, the primary metabolic pathway for metoprolol, was evaluated for each subject. Unbiased metabolomic analyses were performed on urine samples using UPLC-QTOF mass spectrometry. RESULTS: Urinary metoprolol metabolite ratios are indicative of patient CYP2D6 genotypes. Patients taking metoprolol had significantly higher urinary levels of many gut microbiota-dependent metabolites including hydroxyhippuric acid, hippuric acid, and methyluric acid. Urinary metoprolol metabolite profiles of normal metabolizer (NM) patients more closely correlate to ultra-rapid metabolizer (UM) patients than NM patients. Metabolites did not predict either 10% SBP or HR decline. CONCLUSION: In summary, urinary metabolites predict CYP2D6 genotype in hypertensive patients taking metoprolol. Metoprolol succinate therapy affects the microbiome-derived metabolites.


Assuntos
Anti-Hipertensivos/uso terapêutico , Bactérias/efeitos dos fármacos , Microbioma Gastrointestinal , Hipertensão/metabolismo , Metaboloma/efeitos dos fármacos , Metoprolol/uso terapêutico , Urinálise/métodos , Adulto , Idoso , Idoso de 80 Anos ou mais , Bactérias/crescimento & desenvolvimento , Bactérias/metabolismo , Pressão Sanguínea , Feminino , Humanos , Hipertensão/tratamento farmacológico , Hipertensão/microbiologia , Hipertensão/urina , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos
7.
Int J Clin Pharmacol Ther ; 59(7): 506-510, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-33769277

RESUMO

OBJECTIVE: To identify single nucleotide variants (SNVs) associated with lisinopril effectiveness. MATERIALS AND METHODS: This was an observational study using a candidate gene approach to examine SNVs associated with lisinopril effectiveness. Drug effectiveness was defined as 10% decrease in systolic blood pressure at 1 week follow-up. We used the Illumina GWAS MEGA chip to examine variants in the renin/angiotensin pathway that may be associated with drug effectiveness. RESULTS: 61 subjects were enrolled, and 33 (54.1%) were responsive to lisinopril therapy. SNVs in AGT (p = 0.0141), REN (p = 0.0192), and ACE2 (p = 0.0002) were found to be associated with successful treatment on lisinopril. Conclusion and relevance: SNVs in the renin and angiotensin pathway are associated with lisinopril effectiveness in a pilot cohort of patients with uncontrolled hypertension.


Assuntos
Hipertensão , Lisinopril , Inibidores da Enzima Conversora de Angiotensina/farmacologia , Inibidores da Enzima Conversora de Angiotensina/uso terapêutico , Anti-Hipertensivos/farmacologia , Anti-Hipertensivos/uso terapêutico , Pressão Sanguínea , Genômica , Humanos , Hipertensão/tratamento farmacológico , Hipertensão/genética , Lisinopril/farmacologia , Lisinopril/uso terapêutico , Projetos Piloto , Sistema Renina-Angiotensina
8.
Ann Intern Med ; 170(8): 531-537, 2019 04 16.
Artigo em Inglês | MEDLINE | ID: mdl-30909297

RESUMO

Background: Little is known about the relative harms of edible and inhalable cannabis products. Objective: To describe and compare adult emergency department (ED) visits related to edible and inhaled cannabis exposure. Design: Chart review of ED visits between 1 January 2012 and 31 December 2016. Setting: A large urban academic hospital in Colorado. Participants: Adults with ED visits with a cannabis-related International Classification of Diseases, Ninth or 10th Revision, Clinical Modification (ICD-9-CM or ICD-10-CM), code. Measurements: Patient demographic characteristics, route of exposure, dose, symptoms, length of stay, disposition, discharge diagnoses, and attribution of visit to cannabis. Results: There were 9973 visits with an ICD-9-CM or ICD-10-CM code for cannabis use. Of these, 2567 (25.7%) visits were at least partially attributable to cannabis, and 238 of those (9.3%) were related to edible cannabis. Visits attributable to inhaled cannabis were more likely to be for cannabinoid hyperemesis syndrome (18.0% vs. 8.4%), and visits attributable to edible cannabis were more likely to be due to acute psychiatric symptoms (18.0% vs. 10.9%), intoxication (48% vs. 28%), and cardiovascular symptoms (8.0% vs. 3.1%). Edible products accounted for 10.7% of cannabis-attributable visits between 2014 and 2016 but represented only 0.32% of total cannabis sales in Colorado (in kilograms of tetrahydrocannabinol) during that period. Limitation: Retrospective study design, single academic center, self-reported exposure data, and limited availability of dose data. Conclusion: Visits attributable to inhaled cannabis are more frequent than those attributable to edible cannabis, although the latter is associated with more acute psychiatric visits and more ED visits than expected. Primary Funding Source: Colorado Department of Public Health and Environment.


Assuntos
Cannabis/efeitos adversos , Fumar Maconha/efeitos adversos , Plantas Comestíveis/efeitos adversos , Doença Aguda , Adulto , Cannabis/intoxicação , Doenças Cardiovasculares/induzido quimicamente , Colorado , Serviço Hospitalar de Emergência , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Psicoses Induzidas por Substâncias/etiologia , Estudos Retrospectivos , Vômito/induzido quimicamente
10.
Metabolomics ; 15(10): 133, 2019 10 03.
Artigo em Inglês | MEDLINE | ID: mdl-31583478

RESUMO

INTRODUCTION: Only ~ 50% of hypertensive patients will respond to treatment. OBJECTIVE: This pilot study aims to identify clinical and metabolite markers that predict response to lisinopril. METHODS: Hypertensive patients (n = 45) received lisinopril (10 mg) at their baseline visit. Blood pressures were reevaluated one week later. Responders to lisinopril (n = 19) were defined by a 10% decline in systolic blood pressure. Plasma metabolites were evaluated with mass spectrometry. RESULTS: BMI (p = 0.009), GFR (p = 0.015) and 2-oxoglutarate were included in a logistic regression model to predict response to lisinopril. CONCLUSIONS: Further validation cohorts are needed to confirm the predictive values of these clinical and metabolic markers.


Assuntos
Anti-Hipertensivos/farmacologia , Hipertensão/tratamento farmacológico , Lisinopril/farmacologia , Anti-Hipertensivos/sangue , Anti-Hipertensivos/metabolismo , Biomarcadores/sangue , Biomarcadores/metabolismo , Pressão Sanguínea/efeitos dos fármacos , Humanos , Hipertensão/sangue , Hipertensão/metabolismo , Lisinopril/sangue , Lisinopril/metabolismo , Espectrometria de Massas , Metabolômica , Projetos Piloto , Análise de Regressão
11.
Dev Biol ; 426(1): 126-138, 2017 06 01.
Artigo em Inglês | MEDLINE | ID: mdl-28438607

RESUMO

Mitochondria are the most prominent organelle in the oocyte. Somatic cells maintain a healthy population of mitochondria by degrading damaged mitochondria via mitophagy, a specialized autophagy pathway. However, evidence from previous work investigating the more general macroautophagy pathway in oocytes suggests that mitophagy may not be active in the oocyte. This would leave the vast numbers of mitochondria - poised to be inherited by the offspring - vulnerable to damage. Here we test the hypothesis that inactive mitophagy in the oocyte underlies maternal transmission of dysfunctional mitochondria. To determine whether oocytes can complete mitophagy, we used either CCCP or AntimycinA to depolarize mitochondria and trigger mitophagy. After depolarization, we did not detect co-localization of mitochondria with autophagosomes and mitochondrial DNA copy number remained unchanged, indicating the non-functional mitochondrial population was not removed. To investigate the impact of an absence of mitophagy in oocytes with damaged mitochondria on offspring mitochondrial function, we utilized in vitro fertilization of high fat high sugar (HF/HS)-exposed oocytes, which have lower mitochondrial membrane potential and damaged mitochondria. Here, we demonstrate that blastocysts generated from HF/HS oocytes have decreased mitochondrial membrane potential, lower metabolites involved in ATP generation, and accumulation of PINK1, a mitophagy marker protein. This mitochondrial phenotype in the blastocyst mirrors the phenotype we show in HF/HS exposed oocytes. Taken together, these data suggest that the mechanisms governing oocyte mitophagy are fundamentally distinct from those governing somatic cell mitophagy and that the absence of mitophagy in the setting of HF/HS exposure contributes to the oocyte-to-blastocyst transmission of dysfunctional mitochondria.


Assuntos
Autofagia/fisiologia , DNA Mitocondrial/genética , Dosagem de Genes/genética , Potencial da Membrana Mitocondrial/fisiologia , Mitocôndrias/patologia , Mitofagia/fisiologia , Oócitos/metabolismo , Animais , Antimicina A/toxicidade , Células Cultivadas , Feminino , Dosagem de Genes/efeitos dos fármacos , Hidrazonas/toxicidade , Potencial da Membrana Mitocondrial/efeitos dos fármacos , Camundongos , Camundongos Endogâmicos C57BL , Obesidade/patologia
12.
Physiology (Bethesda) ; 32(1): 51-59, 2017 01.
Artigo em Inglês | MEDLINE | ID: mdl-27927805

RESUMO

Recent human and animal studies investigating the roles of the genome, epigenome, and environmental cues have identified associations between offspring predisposition to life-long obesity/metabolic disease and epigenetic modifications such as DNA methylation. This review explores the mechanisms by which maternal exposures impair the health of not only the next generation but also potentially future generations of offspring.


Assuntos
Epigênese Genética , Exposição Materna , Troca Materno-Fetal , Doenças Metabólicas/genética , Obesidade/genética , Animais , Metilação de DNA , Disruptores Endócrinos , Feminino , Histonas/metabolismo , Humanos , Doenças Metabólicas/fisiopatologia , Mitocôndrias/genética , Mitocôndrias/metabolismo , Obesidade/fisiopatologia , Gravidez
13.
Hum Reprod ; 31(6): 1315-26, 2016 06.
Artigo em Inglês | MEDLINE | ID: mdl-27052498

RESUMO

STUDY QUESTION: What effect does diet-induced obesity have on endometrial stromal cell (ESC) decidualization? SUMMARY ANSWER: Diet-induced obesity impairs ESC decidualization. WHAT IS KNOWN ALREADY: Decidualization is important for successful implantation and subsequent health of the pregnancy. Compared with normal-weight women, obese women have lower pregnancy rates (both spontaneous and by assisted reproductive technology), higher rates of early pregnancy loss and poorer oocyte quality. STUDY DESIGN, SIZE, DURATION: Beginning at 6 weeks of age, female C57Bl/6J mice were fed either a high-fat/high-sugar diet (HF/HS; 58% Fat Energy/Sucrose) or a diet of standard mouse chow (CON; 13% Fat) for 12 weeks. At this point, metabolic parameters were measured. Some of the mice (n = 9 HF/HS and 9 CON) were mated with reproductively competent males, and implantation sites were assessed. Other mice (n = 11 HF/HS and 10 CON) were mated with vasectomized males, and artificial decidualization was induced. For in vitro human studies of primary ESCs, endometrial tissue was obtained via biopsy from normo-ovulatory patients without history of infertility (obese = BMI > 30 kg/m(2), n = 11 and lean = BMI < 25 kg/m(2), n = 7) and from patients consented for hysterectomies for a benign indication (n = 4). In vitro studies were also performed with immortalized human ESCs. ESCs were decidualized in culture for nine 9 days in the presence or absence of palmitic acid (PA), and the degree of decidualization was assessed by measuring expression of decidualization markers. PARTICIPANTS/MATERIALS, SETTING, METHODS: The sizes of implantation sites and fetuses were analyzed in mice mated with reproductively competent males. In mice mated with vasectomized males, decidualization was induced, and uterine tissues were analyzed via hematoxylin and eosin staining, quantitative RT-PCR (RT-qPCR), and western blots. Human ESCs were cultured in vitro and induced to decidualize by treatment with cAMP and medroxyprogesterone. The level of expression of decidualization markers was assessed by RT-qPCR (mRNA) and western blotting (protein). ATP content of ESCs was measured, and levels of autophagy were assessed by western blotting of the autophagy regulators acetyl coa carboxylase (ACC) and ULK1 (Ser 317). Autophagic flux was measured by western blot of the marker LC3b-II. MAIN RESULTS AND THE ROLE OF CHANCE: Mice exposed to an HF/HS diet became obese and metabolically impaired. HF/HS-exposed mice mated to reproductively competent males had smaller implantation sites in early pregnancy (P <0.001) and larger fetuses at term (P <0.05) than CON-exposed mice. In the artificial decidualization experiments, mice exposed to the HF/HS diet developed 50% smaller deciduomas than mice exposed to CON diet (P< 0.001). Human ESCs cultured in the presence of PA had markedly decreased mRNA expression of the decidualization markers, decidual prolactin (PRL) (P< 0.0001) and insulin-like growth factor binding protein 1 (IGFBP1) (P< 0.0001). Expression of PRL and IGFBP1 by mRNA were also significantly lower in early follicular phase ESCs of obese women than in those of normal-weight women (P< 0.05). Protein expression of phosphorylated ACC and phosphorylated ULK1, both activated forms, were lower in deciduomas of HF/HS mice than in those of control mice (P < 0.01). In immortalized human ESCs, LC3b-II levels were higher in decidualized cells than in controls, indicating increased autophagy. PA treatment abrogated this increase. LIMITATIONS, REASONS FOR CAUTION: Many aspects of obesity and metabolic impairment could contribute to the decidualization defects observed in the HF/HS-exposed mice. Although our findings suggest that both autophagy and decidualization are impaired by exposure to PA, the underlying mechanisms should be elucidated. Finally, our human patient sample size was small. WIDER IMPLICATIONS OF THE FINDINGS: Although many factors contribute to poor reproductive outcome and early pregnancy loss in obese women, our study suggests the importance of decidualization defects. Such defects may contribute to compromised endometrial receptivity and poor implantation. If defects in autophagy contribute to impaired decidualization, therapeutics could be developed to improve this process and thus improve implantation and pregnancy outcomes in obese women. STUDY FUNDING/COMPETING INTERESTS: Grants include NIH 5T32HD040135-12 (J.S.R.), R01 HD065435 (K.H.M.), NIH T32 HD049305 (J.L.S.) and ACOG Research Grant (M.B.S.). The authors report no conflicts of interest.


Assuntos
Autofagia , Dieta Hiperlipídica , Obesidade/patologia , Células Estromais/patologia , Animais , Biomarcadores/metabolismo , Decídua , Implantação do Embrião , Feminino , Humanos , Masculino , Camundongos Endogâmicos C57BL , Obesidade/etiologia , Obesidade/metabolismo , Ácido Palmítico/farmacologia , Fosforilação , RNA Mensageiro/metabolismo
14.
J Biol Chem ; 289(16): 10989-10998, 2014 Apr 18.
Artigo em Inglês | MEDLINE | ID: mdl-24519932

RESUMO

Non-alcoholic fatty liver disease (NAFLD) is the most common liver disease in the world, and it is thought to be the hepatic manifestation of the metabolic syndrome. Excess dietary fructose causes both metabolic syndrome and NAFLD in rodents and humans, but the pathogenic mechanisms of fructose-induced metabolic syndrome and NAFLD are poorly understood. GLUT8 (Slc2A8) is a facilitative glucose and fructose transporter that is highly expressed in liver, heart, and other oxidative tissues. We previously demonstrated that female mice lacking GLUT8 exhibit impaired first-pass hepatic fructose metabolism, suggesting that fructose transport into the hepatocyte, the primary site of fructose metabolism, is in part mediated by GLUT8. Here, we tested the hypothesis that GLUT8 is required for hepatocyte fructose uptake and for the development of fructose-induced NAFLD. We demonstrate that GLUT8 is a cell surface-localized transporter and that GLUT8 overexpression or GLUT8 shRNA-mediated gene silencing significantly induces and blocks radiolabeled fructose uptake in cultured hepatocytes. We further show diminished fructose uptake and de novo lipogenesis in fructose-challenged GLUT8-deficient hepatocytes. Finally, livers from long term high-fructose diet-fed GLUT8-deficient mice exhibited attenuated fructose-induced hepatic triglyceride and cholesterol accumulation without changes in hepatocyte insulin-stimulated Akt phosphorylation. GLUT8 is thus essential for hepatocyte fructose transport and fructose-induced macrosteatosis. Fructose delivery across the hepatocyte membrane is thus a proximal, modifiable disease mechanism that may be exploited to prevent NAFLD.


Assuntos
Membrana Celular/metabolismo , Fígado Gorduroso/metabolismo , Proteínas Facilitadoras de Transporte de Glucose/metabolismo , Hepatócitos/metabolismo , Lipogênese , Animais , Transporte Biológico Ativo/efeitos dos fármacos , Transporte Biológico Ativo/genética , Membrana Celular/genética , Membrana Celular/patologia , Colesterol/genética , Colesterol/metabolismo , Fígado Gorduroso/genética , Fígado Gorduroso/patologia , Feminino , Frutose/genética , Frutose/metabolismo , Inativação Gênica , Glucose/genética , Glucose/metabolismo , Proteínas Facilitadoras de Transporte de Glucose/genética , Células Hep G2 , Hepatócitos/patologia , Humanos , Hipoglicemiantes/farmacologia , Insulina/farmacologia , Camundongos , Camundongos Knockout , Hepatopatia Gordurosa não Alcoólica , Fosforilação/efeitos dos fármacos , Fosforilação/genética , Proteínas Proto-Oncogênicas c-akt/genética , Proteínas Proto-Oncogênicas c-akt/metabolismo , Triglicerídeos/genética , Triglicerídeos/metabolismo
15.
Pediatr Res ; 76(2): 202-10, 2014 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-24819376

RESUMO

BACKGROUND: Maternal obesity is associated with unfavorable outcomes, which may be reflected in the as yet undiscovered gene expression profiles of the umbilical cord (UC). METHODS: UCs from 12 lean (pregravid BMI < 24.9) and 10 overweight/obese (pregravid BMI ≥ 25) women without gestational diabetes were collected for gene expression analysis using Human Primeview microarrays. Metabolic parameters were assayed in mother's plasma and cord blood. RESULTS: Although offspring birth weight and adiposity (at 2 wk) did not differ between groups, expression of 232 transcripts was affected in UC from overweight/obese compared with those of lean mothers. Gene-set enrichment analysis revealed an upregulation of genes related to metabolism, stimulus and defense response, and inhibitory to insulin signaling in the overweight/obese group. We confirmed that EGR1, periostin, and FOSB mRNA expression was induced in UCs from overweight/obese mothers, while endothelin receptor B, KLF10, PEG3, and EGLN3 expression was decreased. Messenger RNA expression of EGR1, FOSB, MEST, and SOCS1 were positively correlated (P < 0.05) with mother's first-trimester body fat mass (%). CONCLUSION: Our data suggest a positive association between maternal obesity and changes in UC gene expression profiles favoring inflammation and insulin resistance, potentially predisposing infants to develop metabolic dysfunction later on in life.


Assuntos
Regulação da Expressão Gênica/fisiologia , Inflamação/fisiopatologia , Resistência à Insulina/fisiologia , Fenômenos Fisiológicos da Nutrição Materna/fisiologia , Obesidade/fisiopatologia , Cordão Umbilical/fisiopatologia , Adiposidade/fisiologia , Adulto , Análise de Variância , Antropometria , Western Blotting , Moléculas de Adesão Celular/metabolismo , Primers do DNA/genética , Proteína 1 de Resposta de Crescimento Precoce/metabolismo , Feminino , Perfilação da Expressão Gênica , Células Endoteliais da Veia Umbilical Humana , Humanos , Insulina/sangue , Leptina/sangue , Análise em Microsséries , Proteínas Proto-Oncogênicas c-fos/metabolismo , Reação em Cadeia da Polimerase em Tempo Real , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Cordão Umbilical/metabolismo
17.
Surg Infect (Larchmt) ; 25(2): 87-94, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38394296

RESUMO

Background: Pneumonia is associated with increased morbidity and costs in the intensive care unit (ICU). Its early identification is key for optimal outcomes, but early biomarkers are lacking. Studies suggest that fibrinolysis resistance (FR) after major abdominal surgery is linked to an increased risk of infection. Patients and Methods: Patients in a randomized controlled trial for hemorrhagic shock were evaluated for FR. Fibrinolysis resistance was quantified by thrombelastography with exogenous tissue plasminogen activator (tPA-TEG) at 24- and 48-hours post-injury and measuring LY30 (%). A receiver-operating characteristics (ROC) curve analysis was used to identify a cutoff for increased risk of pneumonia, which was then validated in ICU patients at risk for venous thromboembolism (VTE). Multivariable logistic regression was used to control for confounders. Results: Forty-nine patients in the hemorrhagic shock cohort had tPA-TEGs at 24- and 48-hours (median ISS, 27; 7% pneumonia). A composite tPA-TEG LY30 of less than 4% at 24 and 48 hours was found to be the optimal cutoff for increased risk of pneumonia. This cohort had a seven-fold increased rate of pneumonia (4% vs. 28%; p = 0.048). Eighty-eight patients in the VTE cohort had tPA-TEGs at 24 and 48 hours post-ICU admission (median ISS, 28; 6% pneumonia). The tPA-TEG LY30 of less than 4% was associated with a 10-fold increased rate of pneumonia (19% vs. 1.5%; p = 0.002). In patients with traumatic brain injury, the same association was found (33% vs. 3.2%; p = 0.006). Adjusting for confounders, the tPA-TEG persisted as a substantial risk factor for pneumonia (adjusted odds ratio [OR], 35.7; 95% confidence interval [CI], 1.9-682; p = 0.018). Conclusions: Fibrinolysis resistance quantified by tPA-TEG within 48 hours of ICU admission is associated with an increased risk of pneumonia in patients in hemorrhagic shock and those at risk for VTE. Prospective validation of the tPA-TEG LY30 optimal cutoff for pneumonia and further investigation into whether endogenous FR is a cause of an altered immunity is warranted.


Assuntos
Choque Hemorrágico , Tromboembolia Venosa , Ferimentos e Lesões , Humanos , Fibrinólise , Ativador de Plasminogênio Tecidual , Tromboembolia Venosa/epidemiologia , Tromboembolia Venosa/etiologia , Fatores de Risco , Hospitais
18.
Clin J Am Soc Nephrol ; 19(3): 364-373, 2024 03 01.
Artigo em Inglês | MEDLINE | ID: mdl-37962880

RESUMO

BACKGROUND: The number of simultaneous liver-kidney (SLK) transplants has significantly increased in the United States. There has also been an increase in kidney-after-liver transplants associated with 2017 policy revisions aimed to fairly allocate kidneys after livers. SLK and kidney-after-liver candidates are prioritized in allocation policy for kidney offers ahead of kidney-alone candidates. METHODS: We compared kidney graft outcomes of kidney-alone transplant recipients with SLK and kidney-after-liver transplants using paired kidney models to mitigate differences among donor risk factors. We evaluated recipient characteristics between transplant types and calculated differential graft years using restricted mean survival estimates. RESULTS: We evaluated 3053 paired donors to kidney-alone and SLK recipients and 516 paired donors to kidney-alone and kidney-after-liver recipients from August 2017 to August 2022. Kidney-alone recipients were younger, more likely on dialysis, and Black race. One-year and 3-year post-transplant kidney graft survival for kidney-alone recipients was 94% and 86% versus SLK recipients 89% and 80%, respectively, P < 0.001. One-year and 3-year kidney graft survival for kidney-alone recipients was 94% and 84% versus kidney-after-liver recipients 93% and 87%, respectively, P = 0.53. The additional kidney graft years for kidney-alone versus SLK transplants was 21 graft years/100 transplants (SEM=5.0) within 4 years post-transplantation, with no significant difference between kidney-after-liver and kidney-alone transplants. CONCLUSIONS: Over a 5-year period in the United States, SLK transplantation was associated with significantly lower kidney graft survival compared with paired kidney-alone transplants. Most differences in graft survival between SLK and kidney-alone transplants occurred within the first year post-transplantation. By contrast, kidney-after-liver transplants had comparable graft survival with paired kidney-alone transplants.


Assuntos
Transplante de Rim , Transplante de Fígado , Rim Único , Obtenção de Tecidos e Órgãos , Humanos , Estados Unidos , Transplante de Fígado/efeitos adversos , Rim Único/etiologia , Transplante de Rim/efeitos adversos , Sobrevivência de Enxerto , Rim/cirurgia , Fígado/cirurgia
19.
Front Nutr ; 11: 1303822, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38544749

RESUMO

Introduction: Maternal obesity is associated with increased concentrations of human milk (HM) obesogenic hormones, pro-inflammatory cytokines, and oligosaccharides (HMOs) that have been associated with infant growth and adiposity. The objective of this pilot study was to determine if adherence to a Mediterranean meal plan during lactation modulates macronutrients and bioactive molecules in human milk from mothers with obesity. Methods: Sixteen healthy, exclusively breastfeeding women with obesity (body mass index ≥30 kg/m2) enrolled between 4 and 5 months postpartum. The women followed a 4-week Mediterranean meal plan which was provided at no cost. Maternal and infant anthropometrics, HM composition, and infant intakes were measured at enrollment and at weeks 2 and 4 of the intervention. Thirteen mother-infant dyads completed the study. Additionally, participants from an adjacent, observational cohort who had obesity and who collected milk at 5 and 6 months postpartum were compared to this cohort. Results: Participants' healthy eating index scores improved (+27 units, p < 0.001), fat mass index decreased (-4.7%, p < 0.001), and daily energy and fat intake were lower (-423.5 kcal/day, p < 0.001 and-32.7 g/day, p < 0.001, respectively) following the intervention. While HM macronutrient concentrations did not change, HM leptin, total human milk oligosaccharides (HMOs), HMO-bound fucose, Lacto-N-fucopentaose (LNFP)-II, LNFP-III, and difucosyllacto-N-tetrose (DFLNT) concentrations were lower following the intervention. Infant intakes of leptin, tumor necrosis factor (TNF)-α, total HMOs, HMO-bound fucose, LNFP-III and DFLNT were lower following the intervention. Specific components of the maternal diet (protein and fat) and specific measures of maternal diet quality (protein, dairy, greens and beans, fruit and vegetables) were associated with infant intakes and growth. Discussion: Adherence to a Mediterranean meal plan increases dietary quality while reducing total fat and caloric intake. In effect, body composition in women with obesity improved, HM composition and infants' intakes were modulated. These findings provide, for the first time, evidence-based data that enhancing maternal dietary quality during lactation may promote both maternal and child health. Longer intervention studies examining the impact of maternal diet quality on HM composition, infant growth, and infant development are warranted.

20.
Am J Surg ; : 115815, 2024 Jul 02.
Artigo em Inglês | MEDLINE | ID: mdl-39003094

RESUMO

BACKGROUND: Direct peritoneal resuscitation (DPR) is associated with improved outcomes in trauma. Animal models suggest DPR has favorable effects on the liver. We sought to evaluate its safety and assess for improved outcomes in liver transplantation (LT). METHODS: LT patients with renal dysfunction and/or obesity were enrolled in a phase-I clinical trial. DPR lasted 8-24 â€‹h depending on postoperative disposition. Primary outcome was percent of patients completing DPR. Secondary outcomes evaluated complications. Controls with either obesity (control-1) or both risk factors (obesity â€‹+ â€‹renal dysfunction, control-2) were analyzed. RESULTS: Fifteen patients were enrolled (seven with both criteria and eight with obesity alone). DPR was completed in 87 â€‹% of patients, with one meeting stopping criteria. Controls included 45 (control-1) and 24 (control-2) patients. Return to operating room, graft loss, and late infections were lower with DPR. CONCLUSION: DPR appears to be safe in closed abdomens following LT, warranting a follow-up phase-II trial to assess efficacy.

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