Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 1.173
Filtrar
Mais filtros

Intervalo de ano de publicação
1.
Cell ; 177(3): 597-607.e9, 2019 04 18.
Artigo em Inglês | MEDLINE | ID: mdl-31002796

RESUMO

The melanocortin 4 receptor (MC4R) is a G protein-coupled receptor whose disruption causes obesity. We functionally characterized 61 MC4R variants identified in 0.5 million people from UK Biobank and examined their associations with body mass index (BMI) and obesity-related cardiometabolic diseases. We found that the maximal efficacy of ß-arrestin recruitment to MC4R, rather than canonical Gαs-mediated cyclic adenosine-monophosphate production, explained 88% of the variance in the association of MC4R variants with BMI. While most MC4R variants caused loss of function, a subset caused gain of function; these variants were associated with significantly lower BMI and lower odds of obesity, type 2 diabetes, and coronary artery disease. Protective associations were driven by MC4R variants exhibiting signaling bias toward ß-arrestin recruitment and increased mitogen-activated protein kinase pathway activation. Harnessing ß-arrestin-biased MC4R signaling may represent an effective strategy for weight loss and the treatment of obesity-related cardiometabolic diseases.


Assuntos
Mutação com Ganho de Função/genética , Obesidade/patologia , Receptor Tipo 4 de Melanocortina/genética , Transdução de Sinais , Adulto , Idoso , Índice de Massa Corporal , Doença da Artéria Coronariana/complicações , Doença da Artéria Coronariana/metabolismo , Doença da Artéria Coronariana/patologia , AMP Cíclico/metabolismo , Bases de Dados Factuais , Diabetes Mellitus Tipo 2/complicações , Diabetes Mellitus Tipo 2/metabolismo , Diabetes Mellitus Tipo 2/patologia , Feminino , Subunidades alfa Gs de Proteínas de Ligação ao GTP/metabolismo , Predisposição Genética para Doença , Genótipo , Humanos , Masculino , Pessoa de Meia-Idade , Obesidade/complicações , Obesidade/metabolismo , Polimorfismo de Nucleotídeo Único , Receptor Tipo 4 de Melanocortina/química , Receptor Tipo 4 de Melanocortina/metabolismo , beta-Arrestinas/metabolismo
2.
Nature ; 612(7939): 301-309, 2022 12.
Artigo em Inglês | MEDLINE | ID: mdl-36450978

RESUMO

Clonal haematopoiesis involves the expansion of certain blood cell lineages and has been associated with ageing and adverse health outcomes1-5. Here we use exome sequence data on 628,388 individuals to identify 40,208 carriers of clonal haematopoiesis of indeterminate potential (CHIP). Using genome-wide and exome-wide association analyses, we identify 24 loci (21 of which are novel) where germline genetic variation influences predisposition to CHIP, including missense variants in the lymphocytic antigen coding gene LY75, which are associated with reduced incidence of CHIP. We also identify novel rare variant associations with clonal haematopoiesis and telomere length. Analysis of 5,041 health traits from the UK Biobank (UKB) found relationships between CHIP and severe COVID-19 outcomes, cardiovascular disease, haematologic traits, malignancy, smoking, obesity, infection and all-cause mortality. Longitudinal and Mendelian randomization analyses revealed that CHIP is associated with solid cancers, including non-melanoma skin cancer and lung cancer, and that CHIP linked to DNMT3A is associated with the subsequent development of myeloid but not lymphoid leukaemias. Additionally, contrary to previous findings from the initial 50,000 UKB exomes6, our results in the full sample do not support a role for IL-6 inhibition in reducing the risk of cardiovascular disease among CHIP carriers. Our findings demonstrate that CHIP represents a complex set of heterogeneous phenotypes with shared and unique germline genetic causes and varied clinical implications.


Assuntos
COVID-19 , Doenças Cardiovasculares , Humanos , Hematopoiese Clonal/genética , Doenças Cardiovasculares/epidemiologia , Doenças Cardiovasculares/genética
3.
Nature ; 599(7886): 628-634, 2021 11.
Artigo em Inglês | MEDLINE | ID: mdl-34662886

RESUMO

A major goal in human genetics is to use natural variation to understand the phenotypic consequences of altering each protein-coding gene in the genome. Here we used exome sequencing1 to explore protein-altering variants and their consequences in 454,787 participants in the UK Biobank study2. We identified 12 million coding variants, including around 1 million loss-of-function and around 1.8 million deleterious missense variants. When these were tested for association with 3,994 health-related traits, we found 564 genes with trait associations at P ≤ 2.18 × 10-11. Rare variant associations were enriched in loci from genome-wide association studies (GWAS), but most (91%) were independent of common variant signals. We discovered several risk-increasing associations with traits related to liver disease, eye disease and cancer, among others, as well as risk-lowering associations for hypertension (SLC9A3R2), diabetes (MAP3K15, FAM234A) and asthma (SLC27A3). Six genes were associated with brain imaging phenotypes, including two involved in neural development (GBE1, PLD1). Of the signals available and powered for replication in an independent cohort, 81% were confirmed; furthermore, association signals were generally consistent across individuals of European, Asian and African ancestry. We illustrate the ability of exome sequencing to identify gene-trait associations, elucidate gene function and pinpoint effector genes that underlie GWAS signals at scale.


Assuntos
Bancos de Espécimes Biológicos , Bases de Dados Genéticas , Sequenciamento do Exoma , Exoma/genética , África/etnologia , Ásia/etnologia , Asma/genética , Diabetes Mellitus/genética , Europa (Continente)/etnologia , Oftalmopatias/genética , Feminino , Predisposição Genética para Doença/genética , Variação Genética , Estudo de Associação Genômica Ampla , Humanos , Hipertensão/genética , Hepatopatias/genética , Masculino , Mutação , Neoplasias/genética , Característica Quantitativa Herdável , Reino Unido
4.
PLoS Genet ; 20(3): e1011179, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38437227

RESUMO

Recent human genome-wide association studies have identified common missense variants in MARC1, p.Ala165Thr and p.Met187Lys, associated with lower hepatic fat, reduction in liver enzymes and protection from most causes of cirrhosis. Using an exome-wide association study we recapitulated earlier MARC1 p.Ala165Thr and p.Met187Lys findings in 540,000 individuals from five ancestry groups. We also discovered novel rare putative loss of function variants in MARC1 with a phenotype similar to MARC1 p.Ala165Thr/p.Met187Lys variants. In vitro studies of recombinant human MARC1 protein revealed Ala165Thr substitution causes protein instability and aberrant localization in hepatic cells, suggesting MARC1 inhibition or deletion may lead to hepatoprotection. Following this hypothesis, we generated Marc1 knockout mice and evaluated the effect of Marc1 deletion on liver phenotype. Unexpectedly, our study found that whole-body Marc1 deficiency in mouse is not protective against hepatic triglyceride accumulation, liver inflammation or fibrosis. In attempts to explain the lack of the observed phenotype, we discovered that Marc1 plays only a minor role in mouse liver while its paralogue Marc2 is the main Marc family enzyme in mice. Our findings highlight the major difference in MARC1 physiological function between human and mouse.


Assuntos
Estudo de Associação Genômica Ampla , Oximas , Animais , Humanos , Camundongos , Cirrose Hepática
5.
Proc Natl Acad Sci U S A ; 120(32): e2309967120, 2023 08 08.
Artigo em Inglês | MEDLINE | ID: mdl-37523551

RESUMO

Body fat distribution is a heritable risk factor for cardiovascular and metabolic disease. In humans, rare Inhibin beta E (INHBE, activin E) loss-of-function variants are associated with a lower waist-to-hip ratio and protection from type 2 diabetes. Hepatic fatty acid sensing promotes INHBE expression during fasting and in obese individuals, yet it is unclear how the hepatokine activin E governs body shape and energy metabolism. Here, we uncover activin E as a regulator of adipose energy storage. By suppressing ß-agonist-induced lipolysis, activin E promotes fat accumulation and adipocyte hypertrophy and contributes to adipose dysfunction in mice. Mechanistically, we demonstrate that activin E elicits its effect on adipose tissue through ACVR1C, activating SMAD2/3 signaling and suppressing PPARG target genes. Conversely, loss of activin E or ACVR1C in mice increases fat utilization, lowers adiposity, and drives PPARG-regulated gene signatures indicative of healthy adipose function. Our studies identify activin E-ACVR1C as a metabolic rheostat promoting liver-adipose cross talk to restrain excessive fat breakdown and preserve fat mass during prolonged fasting, a mechanism that is maladaptive in obese individuals.


Assuntos
Diabetes Mellitus Tipo 2 , Lipólise , Humanos , Camundongos , Animais , Ativinas/metabolismo , Adiposidade/genética , Diabetes Mellitus Tipo 2/metabolismo , PPAR gama/metabolismo , Obesidade/metabolismo , Tecido Adiposo/metabolismo , Receptores de Ativinas Tipo I/genética , Receptores de Ativinas Tipo I/metabolismo
6.
N Engl J Med ; 387(4): 332-344, 2022 07 28.
Artigo em Inglês | MEDLINE | ID: mdl-35939579

RESUMO

BACKGROUND: Exome sequencing in hundreds of thousands of persons may enable the identification of rare protein-coding genetic variants associated with protection from human diseases like liver cirrhosis, providing a strategy for the discovery of new therapeutic targets. METHODS: We performed a multistage exome sequencing and genetic association analysis to identify genes in which rare protein-coding variants were associated with liver phenotypes. We conducted in vitro experiments to further characterize associations. RESULTS: The multistage analysis involved 542,904 persons with available data on liver aminotransferase levels, 24,944 patients with various types of liver disease, and 490,636 controls without liver disease. We found that rare coding variants in APOB, ABCB4, SLC30A10, and TM6SF2 were associated with increased aminotransferase levels and an increased risk of liver disease. We also found that variants in CIDEB, which encodes a structural protein found in hepatic lipid droplets, had a protective effect. The burden of rare predicted loss-of-function variants plus missense variants in CIDEB (combined carrier frequency, 0.7%) was associated with decreased alanine aminotransferase levels (beta per allele, -1.24 U per liter; 95% confidence interval [CI], -1.66 to -0.83; P = 4.8×10-9) and with 33% lower odds of liver disease of any cause (odds ratio per allele, 0.67; 95% CI, 0.57 to 0.79; P = 9.9×10-7). Rare coding variants in CIDEB were associated with a decreased risk of liver disease across different underlying causes and different degrees of severity, including cirrhosis of any cause (odds ratio per allele, 0.50; 95% CI, 0.36 to 0.70). Among 3599 patients who had undergone bariatric surgery, rare coding variants in CIDEB were associated with a decreased nonalcoholic fatty liver disease activity score (beta per allele in score units, -0.98; 95% CI, -1.54 to -0.41 [scores range from 0 to 8, with higher scores indicating more severe disease]). In human hepatoma cell lines challenged with oleate, CIDEB small interfering RNA knockdown prevented the buildup of large lipid droplets. CONCLUSIONS: Rare germline mutations in CIDEB conferred substantial protection from liver disease. (Funded by Regeneron Pharmaceuticals.).


Assuntos
Proteínas Reguladoras de Apoptose , Mutação em Linhagem Germinativa , Hepatopatias , Proteínas Reguladoras de Apoptose/genética , Proteínas Reguladoras de Apoptose/metabolismo , Predisposição Genética para Doença/genética , Predisposição Genética para Doença/prevenção & controle , Humanos , Fígado/metabolismo , Hepatopatias/genética , Hepatopatias/metabolismo , Hepatopatias/prevenção & controle , Transaminases/genética , Sequenciamento do Exoma
7.
Biol Proced Online ; 26(1): 14, 2024 May 21.
Artigo em Inglês | MEDLINE | ID: mdl-38773366

RESUMO

Extracellular vesicles (EVs) are nano-sized, membranous transporters of various active biomolecules with inflicting phenotypic capabilities, that are naturally secreted by almost all cells with a promising vantage point as a potential leading drug delivery platform. The intrinsic characteristics of their low toxicity, superior structural stability, and cargo loading capacity continue to fuel a multitude of research avenues dedicated to loading EVs with therapeutic and diagnostic cargos (pharmaceutical compounds, nucleic acids, proteins, and nanomaterials) in attempts to generate superior natural nanoscale delivery systems for clinical application in therapeutics. In addition to their well-known role in intercellular communication, EVs harbor microRNAs (miRNAs), which can alter the translational potential of receiving cells and thus act as important mediators in numerous biological and pathological processes. To leverage this potential, EVs can be structurally engineered to shuttle therapeutic miRNAs to diseased recipient cells as a potential targeted 'treatment' or 'therapy'. Herein, this review focuses on the therapeutic potential of EV-coupled miRNAs; summarizing the biogenesis, contents, and function of EVs, as well as providing both a comprehensive discussion of current EV loading techniques and an update on miRNA-engineered EVs as a next-generation platform piloting benchtop studies to propel potential clinical translation on the forefront of nanomedicine.

8.
Br J Surg ; 111(8)2024 Aug 02.
Artigo em Inglês | MEDLINE | ID: mdl-39136268

RESUMO

BACKGROUND: Laparoscopic liver surgery is increasingly used for more challenging procedures. The aim of this study was to assess the feasibility and oncological safety of laparoscopic right hepatectomy for colorectal liver metastases after portal vein embolization. METHODS: This was an international retrospective multicentre study of patients with colorectal liver metastases who underwent open or laparoscopic right and extended right hepatectomy after portal vein embolization between 2004 and 2020. The perioperative and oncological outcomes for patients who underwent laparoscopic and open approaches were compared using propensity score matching. RESULTS: Of 338 patients, 84 patients underwent a laparoscopic procedure and 254 patients underwent an open procedure. Patients in the laparoscopic group less often underwent extended right hepatectomy (18% versus 34.6% (P = 0.004)), procedures in the setting of a two-stage hepatectomy (42% versus 65% (P < 0.001)), and major concurrent procedures (4% versus 16.1% (P = 0.003)). After propensity score matching, 78 patients remained in each group. The laparoscopic approach was associated with longer operating and Pringle times (330 versus 258.5 min (P < 0.001) and 65 versus 30 min (P = 0.001) respectively) and a shorter length of stay (7 versus 8 days (P = 0.011)). The R0 resection rate was not different (71% for the laparoscopic approach versus 60% for the open approach (P = 0.230)). The median disease-free survival was 12 (95% c.i. 10 to 20) months for the laparoscopic approach versus 20 (95% c.i. 13 to 31) months for the open approach (P = 0.145). The median overall survival was 28 (95% c.i. 22 to 48) months for the laparoscopic approach versus 42 (95% c.i. 35 to 52) months for the open approach (P = 0.614). CONCLUSION: The advantages of a laparoscopic over an open approach for (extended) right hepatectomy for colorectal liver metastases after portal vein embolization are limited.


Assuntos
Neoplasias Colorretais , Embolização Terapêutica , Hepatectomia , Laparoscopia , Neoplasias Hepáticas , Veia Porta , Humanos , Hepatectomia/métodos , Neoplasias Hepáticas/secundário , Neoplasias Hepáticas/cirurgia , Neoplasias Colorretais/patologia , Laparoscopia/métodos , Masculino , Feminino , Veia Porta/cirurgia , Embolização Terapêutica/métodos , Estudos Retrospectivos , Pessoa de Meia-Idade , Idoso , Pontuação de Propensão , Resultado do Tratamento , Estudos de Viabilidade , Tempo de Internação
9.
Gynecol Oncol ; 189: 16-23, 2024 Jul 08.
Artigo em Inglês | MEDLINE | ID: mdl-38981151

RESUMO

INTRODUCTION: Epithelial ovarian cancer (EOC) is associated with the highest gynecologic cancer mortality. The development of novel, effective combinations of targeted therapeutics remains an unmet medical need. We evaluated the preclinical activity of datopotamab deruxtecan (Dato-Dxd), a novel TROP2 targeting antibody drug conjugate (ADC) in ovarian cancer cell lines and xenografts with variable TROP2 expression. METHODS: In vitro cell viability with Dato-DXd was assessed using flow-cytometry based assays against a panel of EOC primary cell lines with variable TROP2 expression. Fluorescent anti-phospho-histone H2A.X antibody was used to detect dsDNA breaks by flow-cytometry. The in vivo antitumor activity of Dato-DXd was tested in TROP2 overexpressing xenografts. RESULTS: TROP2 overexpressing (3+) and moderate (2+) expressing EOC cell lines demonstrated higher sensitivity to Dato-DXd when compared to TROP2 negative tumors. Dato-DXd exposed TROP2+ EOC demonstrated increased dsDNA breaks and Annexin-V positivity (a marker of apoptosis) when compared to tumor cells exposed to the non-binding conjugate (p = 0.001 and p = 0.016, respectively). Dato-DXd induced significant antibody-dependent cellular cytotoxicity (ADCC) in the presence of peripheral-blood-lymphocytes. While negligible activity was detected against EOC cell lines with low TROP2 expression, Dato-DXd demonstrated significant bystander killing against tumor cells with low/negligible TROP2 when such cells were admixed with TROP2 3+ tumor cells in vitro. Dato-DXd showed tumor growth suppression against EOC cell line derived xenograft models that overexpress TROP2 at 3+ levels, prolonging survival when compared to controls, with minimal toxicity. CONCLUSION: Dato-DXd shows promising preclinical activity against TROP2 overexpressing ovarian cancers. Future clinical trials in ovarian cancer patients are warranted.

10.
Neuropediatrics ; 55(1): 63-66, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-37913822

RESUMO

We report the case of a preterm of 27 weeks of gestation who developed posthemorrhagic ventricular dilatation associated to a complete thrombosis of the superior sagittal sinus, for its peculiar interest in clarifying the physiology of the cerebrospinal fluid (CSF) dynamics. The exact CSF volume that must be removed to improve cerebral hemodynamics and outcomes in infants with posthemorrhagic ventricular dilatation is unknown. According to Volpe's studies, a volume of 10 to 15 mL/kg/die of body weight is commonly chosen. The subject we report needed an excessive CSF drainage (up to 32 mL/kg/d), in presence of a functioning external ventricular drain. We review the literature on the topic, and we postulate that the superior sagittal sinus may play an active role in the CSF dynamics of the immature brain (as it happens for the adult brain).


Assuntos
Hidrocefalia , Recém-Nascido Prematuro , Lactente , Adulto , Recém-Nascido , Humanos , Seio Sagital Superior/diagnóstico por imagem , Encéfalo/diagnóstico por imagem , Hemodinâmica , Vazamento de Líquido Cefalorraquidiano/complicações , Hemorragia Cerebral
12.
J Comput Assist Tomogr ; 48(1): 26-34, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-37422693

RESUMO

OBJECTIVE: In liver transplantation, chronic rejection is still poorly studied. This study aimed to investigate the role of imaging in its recognition. METHODS: This study is a retrospective observational case-control series. Patients with histologic diagnosis of chronic liver transplant rejection were selected; the last imaging examination (computed tomography or magnetic resonance imaging) before the diagnosis was evaluated. At least 3 controls were selected for each case; radiological signs indicative of altered liver function were analyzed. χ 2 Test with Yates correction was used to compare the rates of radiologic signs in the case and control groups, also considering whether patients suffered chronic rejection within or after 12 months. Statistical significance was set at P < 0.050. RESULTS: A total of 118 patients were included in the study (27 in the case group and 91 in the control group). Periportal edema was appreciable in 19 of 27 cases (70%) and in 6 of 91 controls (4%) ( P < 0.001); ascites and hepatomegaly were present in 14 of 27 cases (52%) and 12 of 27 cases (44%), respectively, and in 1 of 91 controls (1%) ( P < 0.001); splenomegaly was present in 13 of 27 cases (48%) and in 8 of 91 controls (10%) ( P < 0.001); and biliary tract dilatation was present in 13 of 27 cases (48%) and in 11 of 91 patients controls (5%) ( P < 0.001). In the controls, periportal edema was significantly less frequent beyond 12 months after transplant (1% vs 11%; P = 0.020); the other signs after 12 months were not significant. CONCLUSIONS: The identification of periportal edema, biliary dilatation, ascites, and hepatosplenomegaly can serve as potential warning signs of ongoing chronic liver rejection. It is especially important to investigate periportal edema if it is present 1 year or more after orthotopic liver transplantation.


Assuntos
Ascite , Hepatopatias , Humanos , Estudos de Casos e Controles , Estudos Retrospectivos , Tomografia Computadorizada por Raios X/métodos , Imageamento por Ressonância Magnética , Edema
13.
Artigo em Inglês | MEDLINE | ID: mdl-38522871

RESUMO

While it is the main viable option in the growing child and young adult, the Ross procedure has expanded its applicability to older patients, for whom long-term results are equivalent, if not superior, to prosthetic aortic valve replacement. Strategies aiming at mitigating long-term autograft failure from root enlargement and valve regurgitation have led some to advocate for root reinforcement with prosthetic graft material. On the contrary, we will discuss herein the rationale for a tailored approach to the Ross procedure; this strategy is aimed at maintaining the natural physiology and interplay between the various autograft components. Several technical maneuvers, including careful matching of aortic and autograft annuli and sino-tubular junction as well as external support by autologous aortic tissue maintain these physiologic relationships and the viability of the autograft, and could translate in a lower need for late reintervention because of dilation and/or valve regurgitation.


Assuntos
Insuficiência da Valva Aórtica , Estenose da Valva Aórtica , Doenças das Valvas Cardíacas , Valva Pulmonar , Criança , Adulto Jovem , Humanos , Autoenxertos , Insuficiência da Valva Aórtica/cirurgia , Dilatação/efeitos adversos , Transplante Autólogo/efeitos adversos , Transplante Autólogo/métodos , Valva Aórtica/cirurgia , Doenças das Valvas Cardíacas/complicações , Doenças das Valvas Cardíacas/cirurgia , Reoperação , Valva Pulmonar/cirurgia , Estenose da Valva Aórtica/cirurgia , Resultado do Tratamento , Estudos Retrospectivos
14.
Biochem J ; 480(4): 283-296, 2023 02 27.
Artigo em Inglês | MEDLINE | ID: mdl-36701201

RESUMO

Gram-negative bacteria are surrounded by two protein-rich membranes with a peptidoglycan layer sandwiched between them. Together they form the envelope (or cell wall), crucial for energy production, lipid biosynthesis, structural integrity, and for protection against physical and chemical environmental challenges. To achieve envelope biogenesis, periplasmic and outer-membrane proteins (OMPs) must be transported from the cytosol and through the inner-membrane, via the ubiquitous SecYEG protein-channel. Emergent proteins either fold in the periplasm or cross the peptidoglycan (PG) layer towards the outer-membrane for insertion through the ß-barrel assembly machinery (BAM). Trafficking of hydrophobic proteins through the periplasm is particularly treacherous given the high protein density and the absence of energy (ATP or chemiosmotic potential). Numerous molecular chaperones assist in the prevention and recovery from aggregation, and of these SurA is known to interact with BAM, facilitating delivery to the outer-membrane. However, it is unclear how proteins emerging from the Sec-machinery are received and protected from aggregation and proteolysis prior to an interaction with SurA. Through biochemical analysis and electron microscopy we demonstrate the binding capabilities of the unoccupied and substrate-engaged SurA to the inner-membrane translocation machinery complex of SecYEG-SecDF-YidC - aka the holo-translocon (HTL). Supported by AlphaFold predictions, we suggest a role for periplasmic domains of SecDF in chaperone recruitment to the protein translocation exit site in SecYEG. We propose that this immediate interaction with the enlisted chaperone helps to prevent aggregation and degradation of nascent envelope proteins, facilitating their safe passage to the periplasm and outer-membrane.


Assuntos
Proteínas de Escherichia coli , Periplasma , Periplasma/metabolismo , Proteínas de Escherichia coli/metabolismo , Escherichia coli/genética , Escherichia coli/metabolismo , Peptidoglicano/metabolismo , Chaperonas Moleculares/metabolismo , Proteínas de Membrana/metabolismo , Proteínas da Membrana Bacteriana Externa/metabolismo , Proteínas de Membrana Transportadoras/metabolismo , Proteínas de Transporte/metabolismo , Peptidilprolil Isomerase/metabolismo
15.
HPB (Oxford) ; 26(5): 639-647, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38373870

RESUMO

BACKGROUND: There is a lack of consensus on the definition of upfront resectability and use of perioperative systemic therapy for colorectal liver metastases (CRLM). This survey aimed to summarize the current treatment strategies for upfront resectable CRLM throughout Europe. METHODS: A survey was sent to all members of the European-African Hepato-Pancreato-Biliary Association to gain insight into the current views on resectability and the use of systemic therapy for upfront resectable CRLM. RESULTS: The survey was completed by 87 surgeons from 24 countries. The resectability of CRLM is mostly based on the volume of the future liver remnant, while considering tumor biology. Thermal ablation was considered as an acceptable adjunct to resection in parenchymal-sparing CRLM surgery by 77 % of the respondents. A total of 40.2 % of the respondents preferred standard perioperative systemic therapy and 24.1 % preferred standard upfront local treatment. CONCLUSION: Among the participating European hepato-pancreato-biliary surgeons, there is a high degree of consensus on the definition of CRLM resectability. However, there is much variety in the use of adjunctive thermal ablation. Major variations persist in the use of perioperative systemic therapy in cases of upfront resectable CRLM, stressing the need for further evidence and a consensus.


Assuntos
Neoplasias Colorretais , Hepatectomia , Neoplasias Hepáticas , Padrões de Prática Médica , Humanos , Neoplasias Colorretais/patologia , Neoplasias Hepáticas/secundário , Neoplasias Hepáticas/cirurgia , Neoplasias Hepáticas/terapia , Europa (Continente) , Pesquisas sobre Atenção à Saúde , Resultado do Tratamento , Consenso , Quimioterapia Adjuvante , Técnicas de Ablação , Terapia Neoadjuvante
16.
HPB (Oxford) ; 26(2): 188-202, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-37989610

RESUMO

BACKGROUND: Solid benign liver lesions (BLL) are increasingly discovered, but clear indications for surgical treatment are often lacking. Concomitantly, laparoscopic liver surgery is increasingly performed. The aim of this study was to assess if the availability of laparoscopic surgery has had an impact on the characteristics and perioperative outcomes of patients with BLL. METHODS: This is a retrospective international multicenter cohort study, including patients undergoing a laparoscopic or open liver resection for BLL from 19 centers in eight countries. Patients were divided according to the time period in which they underwent surgery (2008-2013, 2014-2016, and 2017-2019). Unadjusted and risk-adjusted (using logistic regression) time-trend analyses were performed. The primary outcome was textbook outcome (TOLS), defined as the absence of intraoperative incidents ≥ grade 2, bile leak ≥ grade B, severe complications, readmission and 90-day or in-hospital mortality, with the absence of a prolonged length of stay added to define TOLS+. RESULTS: In the complete dataset comprised of patients that underwent liver surgery for all indications, the proportion of patients undergoing liver surgery for benign disease remained stable (12.6% in the first time period, 11.9% in the second time period and 12.1% in the last time period, p = 0.454). Overall, 845 patients undergoing a liver resection for BLL in the first (n = 374), second (n = 258) or third time period (n = 213) were included. The rates of ASA-scores≥3 (9.9%-16%,p < 0.001), laparoscopic surgery (57.8%-77%,p < 0.001), and Pringle maneuver use (33.2%-47.2%,p = 0.001) increased, whereas the length of stay decreased (5 to 4 days,p < 0.001). There were no significant changes in the TOLS rate (86.6%-81.3%,p = 0.151), while the TOLS + rate increased from 41.7% to 58.7% (p < 0.001). The latter result was confirmed in the risk-adjusted analyses (aOR 1.849,p = 0.004). CONCLUSION: The surgical treatment of BLL has evolved with an increased implementation of the laparoscopic approach and a decreased length of stay. This evolution was paralleled by stable TOLS rates above 80% and an increase in the TOLS + rate.


Assuntos
Doenças do Sistema Digestório , Laparoscopia , Neoplasias Hepáticas , Humanos , Estudos Retrospectivos , Estudos de Coortes , Complicações Pós-Operatórias/etiologia , Complicações Pós-Operatórias/cirurgia , Tempo de Internação , Laparoscopia/efeitos adversos , Hepatectomia/efeitos adversos , Doenças do Sistema Digestório/cirurgia , Neoplasias Hepáticas/cirurgia , Resultado do Tratamento
17.
Am J Hum Genet ; 106(3): 389-404, 2020 03 05.
Artigo em Inglês | MEDLINE | ID: mdl-32109421

RESUMO

Leukocyte telomere length (LTL) is a heritable biomarker of genomic aging. In this study, we perform a genome-wide meta-analysis of LTL by pooling densely genotyped and imputed association results across large-scale European-descent studies including up to 78,592 individuals. We identify 49 genomic regions at a false dicovery rate (FDR) < 0.05 threshold and prioritize genes at 31, with five highlighting nucleotide metabolism as an important regulator of LTL. We report six genome-wide significant loci in or near SENP7, MOB1B, CARMIL1, PRRC2A, TERF2, and RFWD3, and our results support recently identified PARP1, POT1, ATM, and MPHOSPH6 loci. Phenome-wide analyses in >350,000 UK Biobank participants suggest that genetically shorter telomere length increases the risk of hypothyroidism and decreases the risk of thyroid cancer, lymphoma, and a range of proliferative conditions. Our results replicate previously reported associations with increased risk of coronary artery disease and lower risk for multiple cancer types. Our findings substantially expand current knowledge on genes that regulate LTL and their impact on human health and disease.


Assuntos
Estudo de Associação Genômica Ampla , Leucócitos/ultraestrutura , Nucleotídeos/metabolismo , Telômero , Humanos
18.
Ann Surg ; 277(5): 821-828, 2023 05 01.
Artigo em Inglês | MEDLINE | ID: mdl-35946822

RESUMO

OBJECTIVE: To reach global expert consensus on the definition of TOLS in minimally invasive and open liver resection among renowned international expert liver surgeons using a modified Delphi method. BACKGROUND: Textbook outcome is a novel composite measure combining the most desirable postoperative outcomes into one single measure and representing the ideal postoperative course. Despite a recently developed international definition of Textbook Outcome in Liver Surgery (TOLS), a standardized and expert consensus-based definition is lacking. METHODS: This international, consensus-based, qualitative study used a Delphi process to achieve consensus on the definition of TOLS. The survey comprised 6 surgical domains with a total of 26 questions on individual surgical outcome variables. The process included 4 rounds of online questionnaires. Consensus was achieved when a threshold of at least 80% agreement was reached. The results from the Delphi rounds were used to establish an international definition of TOLS. RESULTS: In total, 44 expert liver surgeons from 22 countries and all 3 major international hepato-pancreato-biliary associations completed round 1. Forty-two (96%), 41 (98%), and 41 (98%) of the experts participated in round 2, 3, and 4, respectively. The TOLS definition derived from the consensus process included the absence of intraoperative grade ≥2 incidents, postoperative bile leakage grade B/C, postoperative liver failure grade B/C, 90-day major postoperative complications, 90-day readmission due to surgery-related major complications, 90-day/in-hospital mortality, and the presence of R0 resection margin. CONCLUSIONS: This is the first study providing an international expert consensus-based definition of TOLS for minimally invasive and open liver resections by the use of a formal Delphi consensus approach. TOLS may be useful in assessing patient-level hospital performance and carrying out international comparisons between centers with different clinical practices to further improve patient outcomes.


Assuntos
Fígado , Complicações Pós-Operatórias , Humanos , Técnica Delphi , Consenso , Complicações Pós-Operatórias/epidemiologia , Inquéritos e Questionários , Fígado/cirurgia
19.
Anal Chem ; 95(28): 10492-10497, 2023 07 18.
Artigo em Inglês | MEDLINE | ID: mdl-37403691

RESUMO

Immunophenotyping of vesicles, such as extracellular vesicles (EVs), is essential to understanding their origin and biological role. We previously described a custom-built flow analyzer that utilizes a gravity-driven flow, high numerical aperture objective, and micrometer-sized flow channels to reach the sensitivity needed for fast multidimensional analysis of the surface proteins of EVs, even down to the smallest EVs (e.g., ∼30-40 nm). It is difficult to flow focus small EVs, and thus, the transiting EVs exhibit a distribution in particle velocities due to the laminar flow. This distribution of vesicle velocities leads to potentially incorrect results when immunophenotyping nanometer-sized vesicles using cross-correlation analysis (Xcorr), as the order of appearance of the vesicles might not be the same at different spatially offset laser excitation regions. Here, we describe an alternative cross-correlation analysis strategy (Scorr), which uses information on particle transit time across the laser excitation beam width to improve multicolor colocalization in single-vesicle immunoprofiling. We tested the performance of the algorithm for colocalization analysis of multicolor nanobeads and EVs experimentally and via simulations and found that Scorr improved both the efficiency and accuracy of colocalization versus Xcorr. As shown from Monte Carlo simulations, Scorr provided an ∼1.2-4.7-fold increase in the number of colocalized peaks and ensured negligible colocalization of peaks. In silico results were in good agreement with experimental data, which showed an increase in colocalized peaks of ∼1.3-2.5-fold and ∼1.2-2-fold for multicolor beads and EVs, respectively.


Assuntos
Vesículas Extracelulares , Citometria de Fluxo/métodos , Vesículas Extracelulares/metabolismo , Luz , Imunofenotipagem
20.
Neurourol Urodyn ; 42(5): 947-955, 2023 06.
Artigo em Inglês | MEDLINE | ID: mdl-36378843

RESUMO

INTRODUCTION: Gender dysphoria affects over 1 million American adults. Vaginoplasty is a critical step in gender affirmation, and many patients have insufficient genital skin for full-depth penile inversion vaginoplasty (PIV). We reviewed the literature for technical considerations addressing this and present our data supporting the use of peritoneal flaps (Davydov technique). MATERIALS AND METHODS: A comprehensive review of modern literature was conducted. Second, we present a retrospective case review of our experience with PIV, including data from procedures utilizing peritoneal flaps. RESULTS: We identified 20 original articles, including retrospective and prospective case and cohort studies. Approaches included the application of local soft tissue grafts and flaps, peritoneal flaps, and intestinal segments. Between June 2018 and February 2021, 47 patients at our institution, underwent PIV for the treatment of gender dysphoria. Nineteen of those patients underwent robotic-assisted peritoneal flap procedure in addition to PIV. In this cohort, the mean follow-up was 200.6 ± 124.8 days. Mean neovaginal depth was 13.1 ± 3.0 cm intra-operatively and 11.0 cm at the last follow-up. Twenty-six percent of complications were Clavien Grade 1 or 2; others included wound dehiscence (30.4%), perianal and urethral fistula (13.0%), and neovaginal stenosis (8.7%). The majority of patients reported satisfactory results in terms of sexual function with intact tactile and erogenous sensation. Almost half were able to have penetrative vaginal intercourse at the last follow-up. We did not aim to perform statistical calculations to compare the outcomes of PIV with and without robotic-assisted peritoneal flap augmentation, as the groups were not constructed in that manner. However, it is evident that anatomical and functional results as well as the distribution of postoperative complications seem similar. CONCLUSION: Vaginoplasty is indicated in a growing population of patients with a wide range of medical histories and anatomic variations. Genitourinary reconstructive surgeons must have several methods to achieve full-depth vaginoplasty in cases of inadequate genital skin. Peritoneal flaps serve as a versatile, safe, and functionally advantageous solution.


Assuntos
Cirurgia de Readequação Sexual , Adulto , Feminino , Humanos , Cirurgia de Readequação Sexual/efeitos adversos , Cirurgia de Readequação Sexual/métodos , Estudos Retrospectivos , Retalhos Cirúrgicos/cirurgia , Períneo/cirurgia , Complicações Pós-Operatórias/etiologia , Vagina/cirurgia
SELEÇÃO DE REFERÊNCIAS
Detalhe da pesquisa