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1.
Nat Cancer ; 4(2): 222-239, 2023 02.
Artigo em Inglês | MEDLINE | ID: mdl-36690875

RESUMO

Immunotherapy efficacy is limited in melanoma, and combinations of immunotherapies with other modalities have yielded limited improvements but also adverse events requiring cessation of treatment. In addition to ineffective patient stratification, efficacy is impaired by paucity of intratumoral immune cells (itICs); thus, effective strategies to safely increase itICs are needed. We report that dietary administration of L-fucose induces fucosylation and cell surface enrichment of the major histocompatibility complex (MHC)-II protein HLA-DRB1 in melanoma cells, triggering CD4+ T cell-mediated increases in itICs and anti-tumor immunity, enhancing immune checkpoint blockade responses. Melanoma fucosylation and fucosylated HLA-DRB1 associate with intratumoral T cell abundance and anti-programmed cell death protein 1 (PD1) responder status in patient melanoma specimens, suggesting the potential use of melanoma fucosylation as a strategy for stratifying patients for immunotherapies. Our findings demonstrate that fucosylation is a key mediator of anti-tumor immunity and, importantly, suggest that L-fucose is a powerful agent for safely increasing itICs and immunotherapy efficacy in melanoma.


Assuntos
Fucose , Melanoma , Humanos , Cadeias HLA-DRB1/genética , Cadeias HLA-DRB1/metabolismo , Fucose/metabolismo , Melanoma/tratamento farmacológico , Imunoterapia , Linfócitos T CD4-Positivos/metabolismo , Linfócitos T CD4-Positivos/patologia
2.
Cells ; 10(6)2021 05 25.
Artigo em Inglês | MEDLINE | ID: mdl-34070332

RESUMO

Alterations in genes encoding for proteins that control fucosylation are known to play causative roles in several developmental disorders, such as Dowling-Degos disease 2 and congenital disorder of glycosylation type IIc (CDGIIc). Recent studies have provided evidence that changes in fucosylation can contribute to the development and progression of several different types of cancers. It is therefore important to gain a detailed understanding of how fucosylation is altered in disease states so that interventions may be developed for therapeutic purposes. In this report, we find that fucosylation occurs on many intracellular proteins. This is an interesting finding, as the fucosylation machinery is restricted to the secretory pathway and is thought to predominately affect cell-membrane-bound and secreted proteins. We find that Ribosomal protein S3 (RPS3) is fucosylated in normal tissues and in cancer cells, and that the extent of its fucosylation appears to respond to stress, including MAPK inhibitors, suggesting a new role in posttranslational protein function. Our data identify a new ribosome-independent species of fucosylated RPS3 that interacts with proteins involved in posttranscriptional regulation of RNA, such as Heterogeneous nuclear ribonucleoprotein U (HNRNPU), as well as with a predominance of non-coding RNAs. These data highlight a novel role for RPS3, which, given previously reported oncogenic roles for RPS3, might represent functions that are perturbed in pathologies such as cancer. Together, our findings suggest a previously unrecognized role for fucosylation in directly influencing intracellular protein functions.


Assuntos
Neoplasias/metabolismo , RNA/metabolismo , Proteínas Ribossômicas/metabolismo , Animais , Linhagem Celular Tumoral , Glicosilação , Humanos , Camundongos , Camundongos Endogâmicos C57BL
3.
Blood Cancer Discov ; 2(2): 162-185, 2021 03.
Artigo em Inglês | MEDLINE | ID: mdl-33860275

RESUMO

MYC oncoproteins regulate transcription of genes directing cell proliferation, metabolism and tumorigenesis. A variety of alterations drive MYC expression in acute myeloid leukemia (AML) and enforced MYC expression in hematopoietic progenitors is sufficient to induce AML. Here we report that AML and myeloid progenitor cell growth and survival rely on MYC-directed suppression of Transcription Factor EB (TFEB), a master regulator of the autophagy-lysosome pathway. Notably, although originally identified as an oncogene, TFEB functions as a tumor suppressor in AML, where it provokes AML cell differentiation and death. These responses reflect TFEB control of myeloid epigenetic programs, by inducing expression of isocitrate dehydrogenase-1 (IDH1) and IDH2, resulting in global hydroxylation of 5-methycytosine. Finally, activating the TFEB-IDH1/IDH2-TET2 axis is revealed as a targetable vulnerability in AML. Thus, epigenetic control by a MYC-TFEB circuit dictates myeloid cell fate and is essential for maintenance of AML.


Assuntos
Fatores de Transcrição de Zíper de Leucina e Hélice-Alça-Hélix Básicos , Isocitrato Desidrogenase , Leucemia Mieloide Aguda , Proteínas Proto-Oncogênicas c-myc , Transdução de Sinais , Fatores de Transcrição de Zíper de Leucina e Hélice-Alça-Hélix Básicos/genética , Diferenciação Celular/genética , Epigênese Genética , Humanos , Isocitrato Desidrogenase/genética , Leucemia Mieloide Aguda/genética , Mutação , Proteínas Proto-Oncogênicas c-myc/genética
4.
J Surg Res ; 259: 493-499, 2021 03.
Artigo em Inglês | MEDLINE | ID: mdl-33070996

RESUMO

BACKGROUND: Limited exposure to surgical subspecialties during medical school may be responsible for decreasing medical student interest in surgery. Although most medical schools have surgery interest groups to increase exposure, our aim was to evaluate the impact of a focused surgical subspecialty roundtable on preclerkship students' perceptions of surgical careers. METHODS: Faculty members from each surgical subspecialty shared their experiences and led roundtable discussions with five to seven first- and second-year medical students at a time (total n = 59). Pre-event and post-event surveys were administered to assess students' interest in surgery, knowledge of training paths, values related to specialty selection, and perception of surgeons. RESULTS: Forty students completed pre-event and post-event surveys. The number of students who were extremely or very interested in surgery increased after this event (65% versus 72.5%, P < 0.001). The greatest number of students indicated an interest in orthopedic surgery, and the fewest indicated an interest in neurosurgery. After the event, thirteen (32.5%) students changed their preferences for the subspecialty in which they were most interested. Students demonstrated improved knowledge of training length and integrated residencies (83.8% versus 96.3%, P = 0.003). The perceived importance of intellectual challenge, research opportunities, and training length decreased, whereas the importance of compensation, work/life balance, long-term patient follow-up, and the job market increased. Students' perceptions of surgeons' work/life balance (10% versus 25%, P < 0.001) and ability to be team players (82.5% versus 85%, P = 0.01) improved significantly after the roundtable. CONCLUSIONS: The surgical specialty roundtable increased students' interest in surgery, improved knowledge of training paths, and altered perceptions related to career decision-making.


Assuntos
Escolha da Profissão , Educação de Graduação em Medicina/estatística & dados numéricos , Especialidades Cirúrgicas/educação , Estudantes de Medicina/psicologia , Adulto , Feminino , Humanos , Internato e Residência/estatística & dados numéricos , Masculino , Pennsylvania , Percepção , Especialidades Cirúrgicas/estatística & dados numéricos , Estudantes de Medicina/estatística & dados numéricos , Inquéritos e Questionários/estatística & dados numéricos , Equilíbrio Trabalho-Vida , Adulto Jovem
5.
World J Emerg Surg ; 13: 30, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29997683

RESUMO

Background: Blunt cerebrovascular injuries (BCVI) are generally associated with high-energy injury mechanisms. Less is known regarding lower-energy injuries in elderly patients. We sought to determine the incidence of BCVI and characterize current BCVI screening practices and associated complications in elderly ground-level fall patients (EGLF, ≥ 65 years). We hypothesized that BCVI in EGLF patients would be clinically significant and screening would be less common. Methods: A retrospective study was performed utilizing the National Trauma Data Bank (NTDB, 2007-2014) and single institutional data. BCVI risk factors and diagnosis were determined by ICD-9 codes. Presenting patient characteristics and clinical course were obtained by chart review. The NTDB dataset was used to determine the incidence of BCVI, risk factors for BCVI, and outcomes in the EGLF cohort. Local chart review focused on screening rates and complications. Results: The incidence of BCVI in EGLF patients was 0.15% overall and 0.86% in those with at least one BCVI risk factor in the NTDB. Upper cervical spine fractures were the most common risk factor for BCVI in EGLF patients. In EGLF patients, the diagnosis of BCVI was an independent risk factor for mortality (OR1.8, 95% C.I. 1.5-2.1). The local institutional data (2007-2014) had a BCVI incidence of 0.37% (n = 6487) and 1.47% in those with at least one risk factor (n = 1429). EGLF patients with a risk factor for BCVI had a very low rate of screening (44%). Only 8% of EGLF patients not screened had documented contraindications. The incidence of renal injury was 9% irrespective of BCVI screening. Conclusions: The incidence of BCVI is clinically significant in EGLF patients and an independent predictor of mortality. Screening is less common in EGLF patients despite few contraindications. This data suggests that using age and injury mechanism to omit BCVI screening in EGLF patients may exclude an at-risk population. Trial registration: IRB approval number: PRO15020269. Retrospective trial not registered.


Assuntos
Acidentes por Quedas/estatística & dados numéricos , Traumatismos Craniocerebrais/diagnóstico , Programas de Rastreamento/métodos , Ferimentos não Penetrantes/complicações , Acidentes por Quedas/mortalidade , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Incidência , Masculino , Sistema de Registros/estatística & dados numéricos , Estudos Retrospectivos , Fatores de Risco
6.
J Nutr Biochem ; 47: 113-119, 2017 09.
Artigo em Inglês | MEDLINE | ID: mdl-28582660

RESUMO

Androgen receptor (AR) is a transcription factor involved in normal prostate physiology and prostate cancer (PCa) development. 3,3'-Diindolylmethane (DIM) is a promising phytochemical agent against PCa that affects AR activity and epigenetic regulators in PCa cells. However, whether DIM suppresses PCa via epigenetic regulation of AR target genes is unknown. We assessed epigenetic regulation of AR target genes in LNCaP PCa cells and showed that DIM treatment led to epigenetic suppression of AR target genes involved in DNA repair (PARP1, MRE11, DNA-PK). Decreased expression of these genes was accompanied by an increase in repressive chromatin marks, loss of AR occupancy and EZH2 recruitment to their regulatory regions. Decreased DNA repair gene expression was associated with an increase in DNA damage (γH2Ax) and up-regulation of genomic repeat elements LINE1 and α-satellite. Our results suggest that DIM suppresses AR-dependent gene transcription through epigenetic modulation, leading to DNA damage and genome instability in PCa cells.


Assuntos
Antineoplásicos Fitogênicos/farmacologia , Cromatina/efeitos dos fármacos , Reparo do DNA/efeitos dos fármacos , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Indóis/farmacologia , Neoplasias da Próstata/tratamento farmacológico , Receptores Androgênicos/metabolismo , Antagonistas de Receptores de Andrógenos/farmacologia , Linhagem Celular Tumoral , Cromatina/metabolismo , Imunoprecipitação da Cromatina , Dano ao DNA , Proteína Quinase Ativada por DNA/antagonistas & inibidores , Proteína Quinase Ativada por DNA/genética , Proteína Quinase Ativada por DNA/metabolismo , Proteína Potenciadora do Homólogo 2 de Zeste/antagonistas & inibidores , Proteína Potenciadora do Homólogo 2 de Zeste/metabolismo , Repressão Enzimática/efeitos dos fármacos , Repressão Epigenética/efeitos dos fármacos , Instabilidade Genômica/efeitos dos fármacos , Humanos , Proteína Homóloga a MRE11/antagonistas & inibidores , Proteína Homóloga a MRE11/genética , Proteína Homóloga a MRE11/metabolismo , Masculino , Proteínas de Neoplasias/antagonistas & inibidores , Proteínas de Neoplasias/genética , Proteínas de Neoplasias/metabolismo , Poli(ADP-Ribose) Polimerase-1/antagonistas & inibidores , Poli(ADP-Ribose) Polimerase-1/genética , Poli(ADP-Ribose) Polimerase-1/metabolismo , Neoplasias da Próstata/metabolismo , Neoplasias da Próstata/patologia , Receptores Androgênicos/química , Receptores Androgênicos/genética , Elementos de Resposta/efeitos dos fármacos
7.
Pharmacol Res ; 119: 347-357, 2017 05.
Artigo em Inglês | MEDLINE | ID: mdl-28212892

RESUMO

Stringent transcriptional regulation is crucial for normal cellular biology and organismal development. Perturbations in the proper regulation of transcription factors can result in numerous pathologies, including cancer. Thus, understanding how transcription factors are regulated and how they are dysregulated in disease states is key to the therapeutic targeting of these factors and/or the pathways that they regulate. Activating transcription factor 2 (ATF2) has been studied in a number of developmental and pathological conditions. Recent findings have shed light on the transcriptional, post-transcriptional, and post-translational regulatory mechanisms that influence ATF2 function, and thus, the transcriptional programs coordinated by ATF2. Given our current knowledge of its multiple levels of regulation and function, ATF2 represents a paradigm for the mechanistic complexity that can regulate transcription factor function. Thus, increasing our understanding of the regulation and function of ATF2 will provide insights into fundamental regulatory mechanisms that influence how cells integrate extracellular and intracellular signals into a genomic response through transcription factors. Characterization of ATF2 dysfunction in the context of pathological conditions, particularly in cancer biology and response to therapy, will be important in understanding how pathways controlled by ATF2 or other transcription factors might be therapeutically exploited. In this review, we provide an overview of the currently known upstream regulators and downstream targets of ATF2.


Assuntos
Fator 2 Ativador da Transcrição/genética , Fator 2 Ativador da Transcrição/metabolismo , Fator 2 Ativador da Transcrição/análise , Animais , Descoberta de Drogas , Humanos , Neoplasias/tratamento farmacológico , Neoplasias/genética , Neoplasias/metabolismo , Processamento de Proteína Pós-Traducional , Ativação Transcricional
8.
Adv Biosyst ; 1(12): e1700116, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-32646160

RESUMO

Therapeutic adult mesenchymal stem cells (MSCs) lose multipotency and multilineage specialization in culture and after transplantation due to the absence of complex biological architecture. Here, it is shown that a transient ultrathin covering of permeable biomaterial can be differentially formulated to either preserve multipotency or induce multidifferentiation. Accordingly, populations of single, spherical MSCs in suspended media with high selectivity and specificity can be coated. Assembly of single, double, and triple hydrogel layers at MSC membranes is initiated by first attaching MSC-specific immunoglobulins onto CD90 or Stro-1 receptors and UEA-1 and soybean lectins. A secondary biotinylated immunoglobulin is targeted for avidin binding, which becomes an attractor for biotinylated alginate or hyaluronate, which are subsequently stiffened and gelled, in situ around the entire cell surface. Alginate microcoatings permeated with mobile BMP-2-induced osteospecialized tissue, vascular endothelial growth factor (VEGF) induced microcapillary formation, while microcoatings, with selected basement membrane proteins, preserve the multipotent phenotype of MSCs, for continuing rounds of culture and directed specialization. Furthermore, forced packing of microcoated MSC populations creates prototypical tissue compartments: the coating partially simulating the extracellular matrix structures. Remarkably, microcoated MSC clusters show a tremendous simulation of a common embryological tissue transformation into the epithelium. Thus, confinement of free morphology exerts another control on tissue specialization and formation.

9.
J Trauma Acute Care Surg ; 82(2): 280-286, 2017 02.
Artigo em Inglês | MEDLINE | ID: mdl-27893639

RESUMO

BACKGROUND: The evolving field of acute care surgery (ACS) traditionally includes trauma, emergency general surgery, and critical care. However, the critical role of ACS in the rescue of patients with a surgical complication has not been explored. We here describe the role of "surgical rescue" in the practice of ACS. METHODS: A prospective, electronic medical record-based ACS registry spanning January 2013 to May 2014 at a large urban academic medical center was screened by ICD-9 codes for acute surgical complications of an operative or interventional procedure. Long-term outcomes were derived from the Social Security Death Index. RESULTS: Of 2,410 ACS patients, 320 (13%) required "surgical rescue": most commonly, from wound complications (32%), uncontrolled sepsis (19%), and acute obstruction (15%). The majority of complications (85%) were related to an operation; 15% were related to interventional procedures. The most common rescue interventions required were bowel resection (23%), wound debridement (18%), and source control of infection (17%); 63% of patients required operative intervention, and 22% required surgical critical care. Thirty-six percent of complications occurred in ACS primary patients ("local"), whereas 38% were referred from another surgical service ("institutional") and 26% referred from another institution ("regional"). Hospital length of stay was longer, and in-hospital and 1-year mortalities were higher in rescue patients compared with those without a complication. Outcomes were equivalent between "local" and "institutional" patients, but hospital length of stay and discharge to home were significantly worse in "institutional" referrals. CONCLUSION: We here describe the distinct role of the acute care surgeon in the surgical management of complications; this is an additional pillar of ACS. In this vital role, the acute care surgeon provides crucial support to other providers as well as direct patient care in the "surgical rescue" of surgical and procedural complications. LEVEL OF EVIDENCE: Epidemiological study, level III; therapeutic/care management study, level IV.


Assuntos
Cuidados Críticos , Complicações Pós-Operatórias/cirurgia , Radiografia Intervencionista/efeitos adversos , Feminino , Mortalidade Hospitalar , Humanos , Masculino , Pessoa de Meia-Idade , Pennsylvania/epidemiologia , Complicações Pós-Operatórias/mortalidade , Estudos Prospectivos , Sistema de Registros , Centros de Traumatologia
10.
J Trauma Acute Care Surg ; 80(5): 805-11, 2016 May.
Artigo em Inglês | MEDLINE | ID: mdl-26885997

RESUMO

BACKGROUND: Older adult trauma patients are at increased risk of poor outcome, both immediately after injury and beyond hospital discharge. Identifying patients early in the hospital stay who are at increased risk of death after discharge can be challenging. METHODS: Retrospective analysis was performed using our trauma registry linked with the social security death index from 2010 to 2014. Age was categorized as 18 to 64 and 65 years or older. We calculated mortality rates by age category then selected elderly patients with mechanism of injury being a fall for further analysis. Computed Tomography Abbreviated Assessment of Sarcopenia for Trauma (CAAST) was obtained by measuring psoas muscle cross-sectional area adjusted for height and weight. Kaplan-Meier survival analysis was performed, and proportional hazards regression modeling was used to determine independent risk factors for in-hospital and out-of-hospital mortality. RESULTS: A total of 23,622 patients were analyzed (16,748, aged 18-64 years; and 6,874, aged 65 or older). In-hospital mortality was 1.96% for ages 18 to 64 and 7.19% for age 65 or older (p < 0.001); postdischarge 6-month mortality was 1.1% for ages 18 to 64 and 12.86% for age 65 or older (p < 0.001). Predictors of in-hospital and postdischarge mortality for ages 18 to 64 and in-hospital mortality for ages 65 or older group included injury characteristics such as ISS, admission vitals, and head injury. Predictors of postdischarge mortality for age 65or older included skilled nursing before admission, disposition, and mechanism of injury being a fall. A total of 57.5% (n = 256) of older patients who sustained a fall met criteria for sarcopenia. Sarcopenia was the strongest predictor of out-of-hospital mortality in this cohort with a hazard ratio of 4.77 (95% confidence interval, 2.71-8.40; p < 0.001). CONCLUSION: Out of hospital does not assure out of danger for the elderly. Sarcopenia is a strong predictor of 6-month postdischarge mortality for older adults. The CAAST measurement is an efficient and inexpensive measure that can allow clinicians to target older trauma patients at risk of poor outcome for early intervention and/or palliative care services. LEVEL OF EVIDENCE: Prognostic and epidemiologic study, level III.


Assuntos
Sistema de Registros , Medição de Risco/métodos , Sarcopenia/diagnóstico por imagem , Tomografia Computadorizada por Raios X/métodos , Ferimentos e Lesões/complicações , Adolescente , Adulto , Idoso , Feminino , Seguimentos , Humanos , Incidência , Escala de Gravidade do Ferimento , Masculino , Pessoa de Meia-Idade , Prognóstico , Reprodutibilidade dos Testes , Estudos Retrospectivos , Fatores de Risco , Sarcopenia/epidemiologia , Sarcopenia/etiologia , Taxa de Sobrevida/tendências , Fatores de Tempo , Estados Unidos/epidemiologia , Ferimentos e Lesões/diagnóstico por imagem , Adulto Jovem
11.
Exp Biol Med (Maywood) ; 241(11): 1177-85, 2016 06.
Artigo em Inglês | MEDLINE | ID: mdl-26643866

RESUMO

Histone deacetylase 6 is a multifunctional lysine deacetylase that is recently emerging as a central facilitator of response to stress and may play an important role in cancer cell proliferation. The histone deacetylase 6-inhibitor tubacin has been shown to slow the growth of metastatic prostate cancer cells and sensitize cancer cells to chemotherapeutic agents. However, the proteins histone deacetylase 6 interacts with, and thus its role in cancer cells, remains poorly characterized. Histone deacetylase 6 deacetylase activity has recently been shown to be required for efficient basal autophagic flux. Autophagy is often dysregulated in cancer cells and may confer stress resistance and allow for cell maintenance and a high proliferation rate. Tubacin may therefore slow cancer cell proliferation by decreasing autophagic flux. We characterized the histone deacetylase 6-interacting proteins in LNCaP metastatic prostate cancer cells and found that histone deacetylase 6 interacts with proteins involved in several cellular processes, including autophagy. Based on our interaction screen, we assessed the impact of the histone deacetylase 6-inhibitor tubacin on autophagic flux in two metastatic prostate cancer cell lines and found that tubacin does not influence autophagic flux. Histone deacetylase 6 therefore influences cell proliferation through an autophagy-independent mechanism.


Assuntos
Autofagia , Histona Desacetilases/metabolismo , Linhagem Celular Tumoral , Proliferação de Células , Desacetilase 6 de Histona , Humanos , Masculino , Mapeamento de Interação de Proteínas
12.
EuPA Open Proteom ; 9: 34-40, 2015 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-26640761

RESUMO

The phytochemical sulforaphane can induce cell cycle arrest and apoptosis in metastatic prostate cancer cells, though the mechanism of action is not fully known. We conducted a global proteome analysis in LNCaP metastatic prostate cancer cells to characterize how global protein signature responds to sulforaphane. We conducted parallel analyses to evaluate semi-quantitative 1-dimensional versus 2-dimensional liquid chromatography tandem mass spectrometry (LC-MS/MS) and their utility in characterizing whole cell lysate. We show that 2-dimensional LC-MS/MS can be a useful tool for characterizing global protein profiles and identify TRIAP1 as a novel regulator of cell proliferation in LNCaP metastatic prostate cancer cells.

14.
Mol Nutr Food Res ; 59(10): 1954-61, 2015 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-26108801

RESUMO

SCOPE: The phytochemical sulforaphane (SF) has been shown to decrease prostate cancer metastases in a genetic mouse model of prostate carcinogenesis, though the mechanism of action is not fully known. SF has been reported to stimulate autophagy, and modulation of autophagy has been proposed to influence SF cytotoxicity; however, no conclusions about autophagy can be drawn without assessing autophagic flux, which has not been characterized in prostate cancer cells following SF treatment. METHODS AND RESULTS: We conducted an investigation to assess the impact of SF on autophagic flux in two metastatic prostate cancer cell lines at a concentration shown to decrease metastasis in vivo. Autophagic flux was assessed by multiple autophagy related proteins and substrates. We found that SF can stimulate autophagic flux and cell death only at high concentrations, above what has been observed in vivo. CONCLUSION: These results suggest that SF does not directly stimulate autophagy or cell death in metastatic prostate cancer cells under physiologically relevant conditions, but instead supports the involvement of in vivo factors as important effectors of SF-mediated prostate cancer suppression.


Assuntos
Autofagia/efeitos dos fármacos , Isotiocianatos/farmacologia , Neoplasias da Próstata/tratamento farmacológico , Neoplasias da Próstata/patologia , Apoptose/efeitos dos fármacos , Morte Celular/efeitos dos fármacos , Linhagem Celular Tumoral/efeitos dos fármacos , Relação Dose-Resposta a Droga , Humanos , Isotiocianatos/administração & dosagem , Masculino , Sulfóxidos
16.
J Trauma Acute Care Surg ; 75(1): 44-9; discussion 49, 2013 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-23778437

RESUMO

BACKGROUND: Single-center experience has shown that American College of Surgeons (ACS) trauma verification can improve outcomes. The current objective was to compare mortality between ACS-verified and state-designated centers in a national sample. METHODS: Subjects 16 years or older from ACS-verified or state-designated Level I and II centers were identified in the National Trauma Databank 2007 to 2008. A predictive mortality model was constructed using Trauma Quality Improvement Project methodology. Imputation was used for missing data. Probability of mortality in the model determined expected deaths. Observed-to-expected (O/E) mortality ratios with 90% confidence interval (CI) and outliers (90% CI more than or less than 1.0) were compared across ACS and state Level I and II centers. The mortality model was repeated with ACS versus state included. RESULTS: There were 900,274 subjects. The model had an area under the curve of 0.92 to predict death. Level I ACS centers had a lower median O/E ratio compared with state centers (0.95 [interquartile range, 0.82-1.05] vs. 1.02 [interquartile range, 0.87-1.15]; p < 0.01), with no difference in Level II centers. Level II state centers had more high O/E outliers. ACS verification was an independent predictor of survival in Level II centers (odds ratio, 1.26; 95% CI, 1.20-1.32; p < 0.01) but not in Level I centers (p = 0.84). CONCLUSION: Level II centers have a disproportionate number of high mortality outliers, and ACS verification is a predictor of survival. Level I ACS centers have lower O/E ratios overall, but no difference in outliers. ACS verification seems beneficial. These data suggest that Level II centers benefit most, and promoting Level II ACS verification may be an opportunity for improved outcomes. LEVEL OF EVIDENCE: Prognostic study, level III.


Assuntos
Mortalidade Hospitalar/tendências , Avaliação de Resultados em Cuidados de Saúde , Centros de Traumatologia/normas , Ferimentos e Lesões/mortalidade , Adolescente , Adulto , Causas de Morte , Intervalos de Confiança , Feminino , Pesquisas sobre Atenção à Saúde , Humanos , Modelos Logísticos , Masculino , Pessoa de Meia-Idade , Razão de Chances , Valor Preditivo dos Testes , Medição de Risco , Sociedades Médicas/normas , Estados Unidos , Ferimentos e Lesões/diagnóstico , Ferimentos e Lesões/terapia , Adulto Jovem
17.
AAPS J ; 15(4): 951-61, 2013 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-23800833

RESUMO

Epidemiological evidence has demonstrated a reduced risk of prostate cancer associated with cruciferous vegetable intake. Follow-up studies have attributed this protective activity to the metabolic products of glucosinolates, a class of secondary metabolites produced by crucifers. The metabolic products of glucoraphanin and glucobrassicin, sulforaphane, and indole-3-carbinol respectively, have been the subject of intense investigation by cancer researchers. Sulforaphane and indole-3-carbinol inhibit prostate cancer by both blocking initiation and suppressing prostate cancer progression in vitro and in vivo. Research has largely focused on the anti-initiation and cytoprotective effects of sulforaphane and indole-3-carbinol through induction of phases I and II detoxification pathways. With regards to suppressive activity, research has focused on the ability of sulforaphane and indole-3-carbinol to antagonize cell signaling pathways known to be dysregulated in prostate cancer. Recent investigations have characterized the ability of sulforaphane and indole-3-carbinol derivatives to modulate the activity of enzymes controlling the epigenetic status of prostate cancer cells. In this review, we will summarize the well-established, "classic" non-epigenetic targets of sulforaphane and indole-3-carbinol, and highlight more recent evidence supporting these phytochemicals as epigenetic modulators for prostate cancer chemoprevention.


Assuntos
Epigênese Genética/fisiologia , Compostos Fitoquímicos/administração & dosagem , Neoplasias da Próstata/genética , Neoplasias da Próstata/prevenção & controle , Verduras , Animais , Apoptose/efeitos dos fármacos , Apoptose/fisiologia , Epigênese Genética/efeitos dos fármacos , Humanos , Masculino , Compostos Fitoquímicos/química , Compostos Fitoquímicos/isolamento & purificação , Neoplasias da Próstata/patologia , Transdução de Sinais/efeitos dos fármacos , Transdução de Sinais/fisiologia
18.
Adv Healthc Mater ; 1(2): 140-8, 2012 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-23184716

RESUMO

One of the most complete and permanent ways of treating many causes of visual impairment and blindness is to replace the entire affected tissue with pre-cultured ocular tissues supported and maintained on biomaterial frameworks. One direction towards enhancing ocular tissue regeneration on biomaterials, in the laboratory is by applying biomimicry. Specifically to engineer biomaterials with important functional elements of the native extracellular matrices, such as topography, that support and organise cells into coherent tissues. Further problems in regenerative ophthalmology can be potentially solved through application of biomimicry. They include, more efficient ways of moving and transplanting cultivated tissues into correct therapeutic locations inside the eye and scar-less, non-destructive healing of surgical incisions and wounds, to repair structural integrity of tissues at the ocular surface. Two examples are given to show this potential for redeveloping an ocular epithelium onto a nanostructured insect wing surface and producing an origami membrane modelled on deployable structures in nature. Efforts to harness natural innovation will eventually provide unique designs and structures that cannot for now be made synthetically, for regeneration of clinically acceptable ocular tissues.


Assuntos
Biomimética/tendências , Oftalmopatias/cirurgia , Previsões , Regeneração Tecidual Guiada/tendências , Oftalmologia/tendências , Medicina Regenerativa/tendências , Engenharia Tecidual/tendências , Humanos
19.
Neoplasia ; 13(3): 198-205, 2011 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-21390183

RESUMO

INTRODUCTION: The CD95/CD95L pathway plays a critical role in tissue homeostasis and immune system regulation; however, the function of this pathway in malignancy remains poorly understood. We hypothesized that CD95L expression in esophageal adenocarcinoma confers advantages to the neoplasm other than immune privilege. METHODS: CD95L expression was characterized in immortalized squamous esophagus (HET-1A) and Barrett esophagus (BAR-T) cells; adenocarcinoma cell lines FLO-1, SEG-1, and BIC-1, and MDA468 (- control); and KFL cells (+ control). Analyses included reverse transcription-polymerase chain reaction, immunoblots of whole cell and secretory vesicle lysates, FACScan analysis, laser scanning confocal microscopy of native proteins and fluorescent constructs, and assessment of apoptosis and ERK1/2 pathways. RESULTS: Cleaved, soluble CD95L is expressed at both the RNA and protein levels in these cell lines derived from esophageal adenocarcinoma and other human tissues. CD95L was neither trafficked to the cell membrane nor secreted into the media or within vesicles, rather the protein seems to be sequestered in the cytoplasm. CD95 and CD95L colocalize by immunofluorescence, but an interaction was not proven by immunoprecipitation. Overexpression of CD95L in the adenocarcinoma cell lines induced robust apoptosis and, under conditions of pan-caspase inhibition, resulted in activation of ERK signaling. CONCLUSIONS: CD95L localization in EA cells is inconsistent with the conference of immune privilege and is more consistent with a function that promotes tumor growth through alternative CD95 signaling. Reduced cell surface expression of CD95 affects cell sensitivity to extracellular apoptotic signals more significantly than alterations in downstream modulators of apoptosis.


Assuntos
Apoptose , Citoplasma/metabolismo , Resistencia a Medicamentos Antineoplásicos , Neoplasias Esofágicas/metabolismo , Neoplasias Esofágicas/patologia , Proteína Ligante Fas/metabolismo , Receptor fas/metabolismo , Adenocarcinoma/tratamento farmacológico , Adenocarcinoma/metabolismo , Adenocarcinoma/patologia , Western Blotting , Proliferação de Células , Neoplasias Esofágicas/tratamento farmacológico , Proteína Ligante Fas/genética , Humanos , Técnicas Imunoenzimáticas , RNA Mensageiro/genética , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Transdução de Sinais , Células Tumorais Cultivadas , Receptor fas/genética
20.
Surgery ; 148(4): 618-24, 2010 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-20705305

RESUMO

BACKGROUND: With liberal use of computed tomography in the diagnostic management of trauma patients, incidental findings are common and represent a major patient-care and medical-legal concern. Consequently, we began an initiative to capture, notify, and documentadequately incidental finding events with a dedicated incidental finding coordinator. We hypothesized a dedicated incidental finding coordinator would increase incidental finding capture and promote notification, follow-up, and documentation of incidental finding events. METHODS: A quality-improvement project to record and follow-up incidental findings postinjury was initiated at our level I trauma center (April 2007-March 2008, prededicated incidental finding). Because of concerns for inadequate documentation of identified incidental finding events, we implemented a dedicated incidental finding coordinator (April 2008-March 2009, postdedicated incidental finding). The dedicated incidental finding coordinator documented incidental findings daily from trauma admission radiology final reads. Incidental findings were divided into 3 groups; category 1: attention prior to discharge; category 2: follow-up with primary doctor within 2 weeks; category 3: no specific follow-up. For category 1 incidental findings, in-hospital consultation of the appropriate service was verified. On discharge, patient notification, follow-up, and documentation of events were confirmed. Certified mail or telephone contact was used to notify either the patient or the primary doctor in those who lacked appropriate notification or documentation. RESULTS: Admission rates and incidental finding categories were similar across the 2 time periods. Implementation of a dedicated incidental finding coordinator resulted in more than a 165% increase in incidental finding capture (n = 802 vs n = 302; P < .001). Patient notification was attempted, and appropriate documentation of events was confirmed in 99.8% of patients. Patient notification was verified, and follow-up was initiated in 95.8% of cases. CONCLUSION: The implementation of a dedicated incidental finding coordinator resulted in more than a 2.5-fold higher capture of incidental findings. Dedicated attention to incidental findings resulted in a near complete initiation of patient notification, follow-up, and hospital record documentation of incidental finding events. Inadequate patient notification and follow-up would delay appropriate care and potentially would result in morbidity or even mortality. A dedicated incidental finding coordinator represents a potential solution to this patient-care and medical-legal dilemma.


Assuntos
Achados Incidentais , Ferimentos e Lesões/diagnóstico por imagem , Adulto , Idoso , Idoso de 80 Anos ou mais , Revelação , Documentação , Feminino , Seguimentos , Humanos , Masculino , Prontuários Médicos , Pessoa de Meia-Idade , Estudos Prospectivos , Garantia da Qualidade dos Cuidados de Saúde , Radiografia , Centros de Traumatologia/normas , Adulto Jovem
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