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1.
J Endocr Soc ; 7(12): bvad135, 2023 Nov 02.
Artigo em Inglês | MEDLINE | ID: mdl-38024650

RESUMO

Severe hypothyroidism can affect a variety of organs and can develop atypical manifestations. Peripheral precocious puberty may be secondary to other endocrinological diseases, which must be taken into account in the differential diagnosis in order to avoid unnecessary additional tests. Van Wyk-Grumbach syndrome is an infrequent manifestation characterized by severe hypothyroidism and incomplete precocious puberty. Diagnosis is made by clinical and complementary tests, and the main treatment goal is to achieve euthyroidism through hormone replacement. Prognosis is good once the treatment is established. The aim of this study is to review the available literature about Van Wyk-Grumbach syndrome following the PRISMA statement, and to present the first clinical case published in Spain. We have included the articles published during the period from 1905 to week 40 of 2022. A total of 68 articles have been selected for study and analysis, within which there are 99 published clinical cases. Girls accounted for 92.1% of cases (median age at the diagnosis 8.5 years). Metrorrhagia was the most prevalent symptom, present in 80.5% of the girls. Abdominal ultrasound was performed in 93.3% of the girls and 97.8% of them had at least one ovarian cyst. All cases were treated with levothyroxine, responding satisfactorily after the first doses of treatment. To conclude, Van Wyk-Grumbach syndrome is characterized by severe hypothyroidism and incomplete precocious puberty, which is important to keep in mind in order to avoid complementary exams and unnecessary surgical interventions.

2.
Proc Natl Acad Sci U S A ; 120(34): e2220269120, 2023 08 22.
Artigo em Inglês | MEDLINE | ID: mdl-37579172

RESUMO

The vascular endothelium from individual organs is functionally specialized, and it displays a unique set of accessible molecular targets. These serve as endothelial cell receptors to affinity ligands. To date, all identified vascular receptors have been proteins. Here, we show that an endothelial lung-homing peptide (CGSPGWVRC) interacts with C16-ceramide, a bioactive sphingolipid that mediates several biological functions. Upon binding to cell surfaces, CGSPGWVRC triggers ceramide-rich platform formation, activates acid sphingomyelinase and ceramide production, without the associated downstream apoptotic signaling. We also show that the lung selectivity of CGSPGWVRC homing peptide is dependent on ceramide production in vivo. Finally, we demonstrate two potential applications for this lipid vascular targeting system: i) as a bioinorganic hydrogel for pulmonary imaging and ii) as a ligand-directed lung immunization tool against COVID-19. Thus, C16-ceramide is a unique example of a lipid-based receptor system in the lung vascular endothelium targeted in vivo by circulating ligands such as CGSPGWVRC.


Assuntos
COVID-19 , Humanos , Ligantes , COVID-19/metabolismo , Ceramidas/metabolismo , Pulmão/metabolismo , Endotélio Vascular/metabolismo , Receptores de Superfície Celular/metabolismo , Proteínas de Transporte/metabolismo , Esfingomielina Fosfodiesterase/metabolismo
3.
Int J Surg ; 106: 106890, 2022 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-36089261

RESUMO

BACKGROUND: Surgical failure-to-rescue (FTR, death rate following complications) is a reliable cross-sectional quality of care marker, but has not been evaluated dynamically. We aimed to study changes in FTR following emergency surgery during the COVID-19 pandemic. MATERIAL AND METHODS: Matched cohort study including all COVID-19-non-infected adult patients undergoing emergency general surgery in 25 Spanish hospitals during COVID-19 pandemic peak (March-April 2020), non-peak (May-June 2020), and 2019 control periods. A propensity score-matched comparative analysis was conducted using a logistic regression model, in which period was regressed on observed baseline characteristics. Subsequently, a mixed effects logistic regression model was constructed for each variable of interest. Main variable was FTR. Secondary variables were post-operative complications, readmissions, reinterventions, and length of stay. RESULTS: 5003 patients were included (948, 1108, and 2947 in the pandemic peak, non-peak, and control periods), with comparable clinical characteristics, prognostic scores, complications, reintervention, rehospitalization rates, and length of stay across periods. FTR was greater during the pandemic peak than during non-peak and pre-pandemic periods (22.5% vs. 17.2% and 12.7%), being this difference confirmed in adjusted analysis (odds ratio [OR] 2.13, 95% confidence interval [95% CI] 1.27-3.66). There was sensible inter-hospital variability in FTR changes during the pandemic peak (median FTR change +8.77%, IQR 0-29.17%) not observed during the pandemic non-peak period (median FTR change 0%, IQR -6.01-6.72%). Greater FTR increase was associated with higher COVID-19 incidence (OR 2.31, 95% CI 1.31-4.16) and some hospital characteristics, including tertiary level (OR 3.07, 95% CI 1.27-8.00), medium-volume (OR 2.79, 95% CI 1.14-7.34), and high basal-adjusted complication risk (OR 2.21, 95% CI 1.07-4.72). CONCLUSION: FTR following emergency surgery experienced a heterogeneous increase during different periods of the COVID-19 pandemic, suggesting it to behave as an indicator of hospital resilience. FTR monitoring could facilitate identification of centres in special needs during ongoing health care challenges.


Assuntos
COVID-19 , Humanos , Adulto , COVID-19/epidemiologia , Pandemias , Estudos Retrospectivos , Pontuação de Propensão , Estudos de Coortes , Estudos Transversais , Mortalidade Hospitalar , Hospitais , Complicações Pós-Operatórias/epidemiologia , Complicações Pós-Operatórias/etiologia
4.
Int J Surg ; 96: 106171, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34774727

RESUMO

BACKGROUND: COVID-19 infection is associated with a higher mortality rate in surgical patients, but surgical risk scores have not been validated in the emergency setting. We aimed to study the capacity for postoperative mortality prediction of the P-POSSUM score in COVID-19-positive patients submitted to emergency general and digestive surgery. MATERIAL AND METHODS: Consecutive patients undergoing emergency general and digestive surgery from March to June 2020, and from March to June 2019 in 25 Spanish hospitals were included in a retrospective cohort study. MAIN OUTCOME: 30-day mortality. P-POSSUM discrimination was quantified by the area under the curve (AUC) of ROC curves; calibration was assessed by linear regression slope (ß estimator); and sensitivity and specificity were expressed as percentage and 95% confidence interval (CI). RESULTS: 4988 patients were included: 177 COVID-19-positive; 2011 intra-pandemic COVID-19-negative; and 2800 pre-pandemic. COVID-19-positive patients were older, with higher surgical risk, more advanced pathologies, and higher P-POSSUM values (1.79% vs. 1.09%, p < 0.001, in both the COVID-19-negative and control cohort). 30-day mortality in the COVID-19-positive, intra-pandemic COVID-19-negative and pre-pandemic cohorts were: 12.9%, 4.6%, and 3.2%. The P-POSSUM predictive values in the three cohorts were, respectively: AUC 0.88 (95% CI 0.81-0.95), 0.89 (95% CI 0.87-0.92), and 0.91 (95% CI 0.88-0.93); ß value 0.97 (95% CI 0.74-1.2), 0.99 (95% CI 0.82-1.16), and 0.78 (95% CI 0.74-0.82); sensitivity 83% (95% CI 61-95), 91% (95% CI 84-96), and 89% (95% CI 80-94); and specificity 81% (95% CI 74-87), 76% (95% CI 74-78), and 80% (95% CI 79-82). CONCLUSION: The P-POSSUM score showed a good predictive capacity for postoperative mortality in COVID-19-positive patients submitted to emergency general and digestive surgery.


Assuntos
COVID-19 , Humanos , Complicações Pós-Operatórias , Curva ROC , Estudos Retrospectivos , Medição de Risco , SARS-CoV-2 , Índice de Gravidade de Doença
5.
DNA Repair (Amst) ; 105: 103152, 2021 09.
Artigo em Inglês | MEDLINE | ID: mdl-34186496

RESUMO

The Polb gene encodes DNA polymerase beta (Pol ß), a DNA polymerase that functions in base excision repair (BER) and microhomology-mediated end-joining. The Pol ß-Y265C protein exhibits low catalytic activity and fidelity, and is also deficient in microhomology-mediated end-joining. We have previously shown that the PolbY265C/+ and PolbY265C/C mice develop lupus. These mice exhibit high levels of antinuclear antibodies and severe glomerulonephritis. We also demonstrated that the low catalytic activity of the Pol ß-Y265C protein resulted in accumulation of BER intermediates that lead to cell death. Debris released from dying cells in our mice could drive development of lupus. We hypothesized that deletion of the Neil1 and Ogg1 DNA glycosylases that act upstream of Pol ß during BER would result in accumulation of fewer BER intermediates, resulting in less severe lupus. We found that high levels of antinuclear antibodies are present in the sera of PolbY265C/+ mice deleted of Ogg1 and Neil1 DNA glycosylases. However, these mice develop significantly less severe renal disease, most likely due to high levels of IgM in their sera.


Assuntos
DNA Glicosilases/metabolismo , DNA Polimerase beta/metabolismo , Reparo do DNA , Lúpus Eritematoso Sistêmico/enzimologia , Mutação , Estresse Oxidativo , Animais , DNA/metabolismo , DNA Glicosilases/genética , DNA Polimerase beta/genética , Modelos Animais de Doenças , Deleção de Genes , Lúpus Eritematoso Sistêmico/genética , Lúpus Eritematoso Sistêmico/metabolismo , Camundongos
6.
Elife ; 102021 06 01.
Artigo em Inglês | MEDLINE | ID: mdl-34060472

RESUMO

Triple-negative breast cancer (TNBC) is an aggressive tumor with limited treatment options and poor prognosis. We applied the in vivo phage display technology to isolate peptides homing to the immunosuppressive cellular microenvironment of TNBC as a strategy for non-malignant target discovery. We identified a cyclic peptide (CSSTRESAC) that specifically binds to a vitamin D receptor, protein disulfide-isomerase A3 (PDIA3) expressed on the cell surface of tumor-associated macrophages (TAM), and targets breast cancer in syngeneic TNBC, non-TNBC xenograft, and transgenic mouse models. Systemic administration of CSSTRESAC to TNBC-bearing mice shifted the cytokine profile toward an antitumor immune response and delayed tumor growth. Moreover, CSSTRESAC enabled ligand-directed theranostic delivery to tumors and a mathematical model confirmed our experimental findings. Finally, in silico analysis showed PDIA3-expressing TAM in TNBC patients. This work uncovers a functional interplay between a cell surface vitamin D receptor in TAM and antitumor immune response that could be therapeutically exploited.


Assuntos
Antineoplásicos/farmacologia , Oligopeptídeos/farmacologia , Isomerases de Dissulfetos de Proteínas/metabolismo , Neoplasias de Mama Triplo Negativas/tratamento farmacológico , Macrófagos Associados a Tumor/efeitos dos fármacos , Proteína de Ligação a Vitamina D/metabolismo , Animais , Linhagem Celular Tumoral , Ativação Enzimática , Feminino , Regulação Neoplásica da Expressão Gênica , Humanos , Ligantes , Camundongos Endogâmicos BALB C , Camundongos Nus , Modelos Biológicos , Isomerases de Dissulfetos de Proteínas/genética , Transdução de Sinais , Neoplasias de Mama Triplo Negativas/imunologia , Neoplasias de Mama Triplo Negativas/metabolismo , Neoplasias de Mama Triplo Negativas/patologia , Carga Tumoral/efeitos dos fármacos , Microambiente Tumoral , Macrófagos Associados a Tumor/imunologia , Macrófagos Associados a Tumor/metabolismo , Proteína de Ligação a Vitamina D/genética , Ensaios Antitumorais Modelo de Xenoenxerto
7.
Med ; 2(3): 321-342, 2021 03 12.
Artigo em Inglês | MEDLINE | ID: mdl-33870243

RESUMO

BACKGROUND: The extensive alveolar capillary network of the lungs is an attractive route for administration of several agents. One key functional attribute is the rapid onset of systemic action due to the absence of first-pass metabolism. METHODS: Here we applied a combinatorial approach for ligand-directed pulmonary delivery as a unique route for systemic targeting in vaccination. FINDINGS: We screened a phage display random peptide library in vivo to select, identify, and validate a ligand (CAKSMGDIVC) that specifically targets and is internalized through its receptor, α3ß1 integrin, on the surface of cells lining the lung airways and alveoli and mediates CAKSMGDIVC-displaying phage binding and systemic delivery without compromising lung homeostasis. As a proof-of-concept, we show that the pulmonary delivery of targeted CAKSMGDIVC-displaying phage particles in mice and non-human primates elicit a systemic and specific humoral response. CONCLUSIONS: This broad methodology blueprint represents a robust and versatile platform tool enabling new ligand-receptor discovery with many potential translational applications. FUNDING: Cancer Center Support Grants to the University of Texas M.D. Anderson Cancer Center (CA016672), University of New Mexico Comprehensive Cancer Center (CA118100), Rutgers Cancer Institute of New Jersey (CA072720), research awards from the Gillson Longenbaugh Foundation, and National Institutes of Health (NIH) grant no. 1R01CA226537.


Assuntos
Bacteriófagos , Pulmão , Animais , Bacteriófagos/genética , Proteínas de Transporte/metabolismo , Ligantes , Pulmão/metabolismo , Camundongos , Primatas/metabolismo , Estados Unidos , Vacinação
8.
Hepatobiliary Pancreat Dis Int ; 20(5): 485-492, 2021 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-33753002

RESUMO

BACKGROUND: There are no clearly defined indications for pancreas-preserving duodenectomy. The present study aimed to analyze postoperative morbidity and the outcomes of patients undergoing pancreas-preserving duodenectomy. METHODS: Patients undergoing pancreas-preserving duodenectomy from April 2008 to May 2020 were included. We divided the series according to indication: scenario 1, primary duodenal tumors; scenario 2, tumors of another origin with duodenal involvement; and scenario 3, emergency duodenectomy. RESULTS: We included 35 patients. Total duodenectomy was performed in 1 patient of adenomatous duodenal polyposis, limited duodenectomy in 7, and third + fourth duodenal portion resection in 27. The indications for scenario 1 were gastrointestinal stromal tumor (n = 13), adenocarcinoma (n = 4), neuroendocrine tumor (n = 3), duodenal adenoma (n = 1), and adenomatous duodenal polyposis (n = 1); scenario 2: retroperitoneal desmoid tumor (n = 2), recurrence of liposarcoma (n = 2), retroperitoneal paraganglioma (n = 1), neuroendocrine tumor in pancreatic uncinate process (n = 1), and duodenal infiltration due to metastatic adenopathies of a germinal tumor with digestive hemorrhage (n = 1); and scenario 3: aortoenteric fistula (n = 3), duodenal trauma (n = 1), erosive duodenitis (n = 1), and biliopancreatic limb ischemia (n = 1). Severe complications (Clavien-Dindo ≥ IIIb) developed in 14% (5/35), and postoperative mortality was 3% (1/35). CONCLUSIONS: Pancreas-preserving duodenectomy is useful in the management of primary duodenal tumors, and is a technical option for some tumors with duodenal infiltration or in emergency interventions.


Assuntos
Polipose Adenomatosa do Colo , Neoplasias Duodenais , Tumores Neuroendócrinos , Anastomose Cirúrgica , Neoplasias Duodenais/cirurgia , Duodeno/cirurgia , Humanos , Tumores Neuroendócrinos/diagnóstico por imagem , Tumores Neuroendócrinos/cirurgia , Pâncreas/cirurgia
9.
EMBO Rep ; 22(4): e50835, 2021 04 07.
Artigo em Inglês | MEDLINE | ID: mdl-33586867

RESUMO

Regulation of mRNA stability and translation plays a critical role in determining protein abundance within cells. Processing bodies (P-bodies) are critical regulators of these processes. Here, we report that the Pim1 and 3 protein kinases bind to the P-body protein enhancer of mRNA decapping 3 (EDC3) and phosphorylate EDC3 on serine (S)161, thereby modifying P-body assembly. EDC3 phosphorylation is highly elevated in many tumor types, is reduced upon treatment of cells with kinase inhibitors, and blocks the localization of EDC3 to P-bodies. Prostate cancer cells harboring an EDC3 S161A mutation show markedly decreased growth, migration, and invasion in tissue culture and in xenograft models. Consistent with these phenotypic changes, the expression of integrin ß1 and α6 mRNA and protein is reduced in these mutated cells. These results demonstrate that EDC3 phosphorylation regulates multiple cancer-relevant functions and suggest that modulation of P-body activity may represent a new paradigm for cancer treatment.


Assuntos
Estabilidade de RNA , Mutação , Fosforilação , RNA Mensageiro/metabolismo
10.
Oncogene ; 39(31): 5390-5404, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-32565538

RESUMO

The androgen receptor (AR) is the major driver of prostate cancer growth and survival. However, almost all patients relapse with castration-resistant disease (CRPC) when treated with anti-androgen therapy. In CRPC, AR is often aberrantly activated independent of androgen. Targeting survival pathways downstream of AR could be a viable strategy to overcome CRPC. Surprisingly, little is known about how AR drives prostate cancer survival. Furthermore, CRPC tumors in which Pten is lost are also resistant to eradication by PI3K inhibitors. We sought to identify the mechanism by which AR drives tumor survival in CRPC to identify ways to overcome resistance to PI3K inhibition. We found that integrins α6ß1 and Bnip3 are selectively elevated in CRPC downstream of AR. While integrin α6 promotes survival and is a direct transcriptional target of AR, the ability of AR to induce Bnip3 is dependent on adhesion to laminin and integrin α6ß1-dependent nuclear translocation of HIF1α. Integrins α6ß1 and Bnip3 were found to promote survival of CRPC cells selectively on laminin through the induction of autophagy and mitophagy. Furthermore, blocking Bnip3 or integrin α6ß1 restored sensitivity to PI3K inhibitors in Pten-negative CRPC. We identified an AR driven pathway that cooperates with laminin and hypoxia to drive resistance to PI3K inhibitors. These findings can help explain in part why PI3K inhibitors have failed in clinical trials to overcome AR-dependent CRPC.


Assuntos
Integrina alfa6beta1/metabolismo , Proteínas de Membrana/metabolismo , Neoplasias de Próstata Resistentes à Castração/tratamento farmacológico , Neoplasias de Próstata Resistentes à Castração/genética , Proteínas Proto-Oncogênicas/metabolismo , Receptores Androgênicos/genética , Animais , Humanos , Masculino , Inibidores de Proteínas Quinases/uso terapêutico , Receptores Androgênicos/metabolismo , Análise de Sobrevida
11.
Proc Natl Acad Sci U S A ; 116(41): 20505-20510, 2019 10 08.
Artigo em Inglês | MEDLINE | ID: mdl-31548394

RESUMO

The Pim and AKT serine/threonine protein kinases are implicated as drivers of cancer. Their regulation of tumor growth is closely tied to the ability of these enzymes to mainly stimulate protein synthesis by activating mTORC1 (mammalian target of rapamycin complex 1) signaling, although the exact mechanism is not completely understood. mTORC1 activity is normally suppressed by amino acid starvation through a cascade of multiple regulatory protein complexes, e.g., GATOR1, GATOR2, and KICSTOR, that reduce the activity of Rag GTPases. Bioinformatic analysis revealed that DEPDC5 (DEP domain containing protein 5), a component of GATOR1 complex, contains Pim and AKT protein kinase phosphorylation consensus sequences. DEPDC5 phosphorylation by Pim and AKT kinases was confirmed in cancer cells through the use of phospho-specific antibodies and transfection of phospho-inactive DEPDC5 mutants. Consistent with these findings, during amino acid starvation the elevated expression of Pim1 overcame the amino acid inhibitory protein cascade and activated mTORC1. In contrast, the knockout of DEPDC5 partially blocked the ability of small molecule inhibitors against Pim and AKT kinases both singly and in combination to suppress tumor growth and mTORC1 activity in vitro and in vivo. In animal experiments knocking in a glutamic acid (S1530E) in DEPDC5, a phospho mimic, in tumor cells induced a significant level of resistance to Pim and the combination of Pim and AKT inhibitors. Our results indicate a phosphorylation-dependent regulatory mechanism targeting DEPDC5 through which Pim1 and AKT act as upstream effectors of mTORC1 to facilitate proliferation and survival of cancer cells.


Assuntos
Proliferação de Células , Proteínas Ativadoras de GTPase/metabolismo , Alvo Mecanístico do Complexo 1 de Rapamicina/metabolismo , Mutação , Neoplasias/patologia , Proteínas Proto-Oncogênicas c-akt/metabolismo , Proteínas Proto-Oncogênicas c-pim-1/metabolismo , Animais , Apoptose , Proteínas Ativadoras de GTPase/genética , Humanos , Masculino , Alvo Mecanístico do Complexo 1 de Rapamicina/genética , Camundongos , Camundongos Endogâmicos NOD , Camundongos SCID , Neoplasias/genética , Neoplasias/metabolismo , Fosforilação , Proteínas Proto-Oncogênicas c-akt/genética , Proteínas Proto-Oncogênicas c-pim-1/genética , Transdução de Sinais , Células Tumorais Cultivadas , Ensaios Antitumorais Modelo de Xenoenxerto
14.
JCI Insight ; 2(19)2017 10 05.
Artigo em Inglês | MEDLINE | ID: mdl-28978808

RESUMO

Subsets of mature B cell neoplasms are linked to infection with intracellular pathogens such as Epstein-Barr virus (EBV), hepatitis C virus (HCV), or Helicobacter pylori. However, the association between infection and the immunoglobulin-secreting (Ig-secreting) B proliferative disorders remains largely unresolved. We investigated whether the monoclonal IgG (mc IgG) produced by patients diagnosed with monoclonal gammopathy of undetermined significance (MGUS) or multiple myeloma (MM) targets infectious pathogens. Antigen specificity of purified mc IgG from a large patient cohort (n = 244) was determined using a multiplex infectious-antigen array (MIAA), which screens for reactivity to purified antigens or lysates from 9 pathogens. Purified mc IgG from 23.4% of patients (57 of 244) specifically recognized 1 pathogen in the MIAA. EBV was the most frequent target (15.6%), with 36 of 38 mc IgGs recognizing EBV nuclear antigen-1 (EBNA-1). MM patients with EBNA-1-specific mc IgG (14.0%) showed substantially greater bone marrow plasma cell infiltration and higher ß2-microglobulin and inflammation/infection-linked cytokine levels compared with other smoldering myeloma/MM patients. Five other pathogens were the targets of mc IgG: herpes virus simplex-1 (2.9%), varicella zoster virus (1.6%), cytomegalovirus (0.8%), hepatitis C virus (1.2%), and H. pylori (1.2%). We conclude that a dysregulated immune response to infection may underlie disease onset and/or progression of MGUS and MM for subsets of patients.


Assuntos
Anticorpos Antivirais/sangue , Imunoglobulina G/sangue , Gamopatia Monoclonal de Significância Indeterminada/imunologia , Mieloma Múltiplo/imunologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Criança , Pré-Escolar , Epitopos/imunologia , Infecções por Vírus Epstein-Barr/complicações , Infecções por Vírus Epstein-Barr/imunologia , Antígenos Nucleares do Vírus Epstein-Barr/imunologia , Feminino , Infecções por Helicobacter/complicações , Infecções por Helicobacter/imunologia , Helicobacter pylori/imunologia , Herpes Simples/complicações , Herpes Simples/imunologia , Herpesvirus Humano 1/imunologia , Herpesvirus Humano 4/imunologia , Humanos , Masculino , Pessoa de Meia-Idade , Gamopatia Monoclonal de Significância Indeterminada/microbiologia , Mieloma Múltiplo/microbiologia , Viroses/complicações , Viroses/imunologia , Adulto Jovem
15.
Proc Natl Acad Sci U S A ; 114(30): 8065-8070, 2017 07 25.
Artigo em Inglês | MEDLINE | ID: mdl-28698375

RESUMO

Osteosarcoma occurs predominantly in children and young adults. High-grade tumors require multidisciplinary treatment consisting of chemotherapy in the neoadjuvant and adjuvant settings, along with surgical intervention. Despite this approach, death from respiratory failure secondary to the development and progression of pulmonary metastases remains a significant problem. Here, we identify the IL-11 receptor α subunit (IL-11Rα) as a cell surface marker of tumor progression that correlates with poor prognosis in patients with osteosarcoma. We also show that both IL-11Rα and its ligand, IL-11, are specifically up-regulated in human metastatic osteosarcoma cell lines; engagement of this autocrine loop leads to tumor cell proliferation, invasion, and anchorage-independent growth in vitro. Consistently, IL-11Rα promotes lung colonization by human metastatic osteosarcoma cells in vivo in an orthotopic mouse model. Finally, we evaluate the IL-11Rα-targeted proapoptotic agent bone metastasis-targeting peptidomimetic (BMTP-11) in preclinical models of primary intratibial osteosarcomas, observing marked inhibition of both tumor growth and lung metastases. This effect was enhanced when BMTP-11 was combined with the chemotherapeutic drug gemcitabine. Our combined data support the development of approaches targeting IL-11Rα, and establish BMTP-11 as a leading drug candidate for clinical translation in patients with high-risk osteosarcoma.


Assuntos
Neoplasias Ósseas/tratamento farmacológico , Subunidade alfa de Receptor de Interleucina-11/antagonistas & inibidores , Osteossarcoma/tratamento farmacológico , Peptídeos/uso terapêutico , Animais , Comunicação Autócrina , Neoplasias Ósseas/metabolismo , Linhagem Celular Tumoral , Ensaios de Seleção de Medicamentos Antitumorais , Humanos , Subunidade alfa de Receptor de Interleucina-11/metabolismo , Neoplasias Pulmonares/metabolismo , Neoplasias Pulmonares/prevenção & controle , Neoplasias Pulmonares/secundário , Masculino , Camundongos Nus , Metástase Neoplásica , Osteossarcoma/metabolismo , Peptídeos/farmacologia , Pesquisa Translacional Biomédica
16.
Proc Natl Acad Sci U S A ; 113(45): 12780-12785, 2016 Nov 08.
Artigo em Inglês | MEDLINE | ID: mdl-27791177

RESUMO

Inflammatory breast carcinoma (IBC) is one of the most lethal forms of human breast cancer, and effective treatment for IBC is an unmet clinical need in contemporary oncology. Tumor-targeted theranostic approaches are emerging in precision medicine, but only a few specific biomarkers are available. Here we report up-regulation of the 78-kDa glucose-regulated protein (GRP78) in two independent discovery and validation sets of specimens derived from IBC patients, suggesting translational promise for clinical applications. We show that a GRP78-binding motif displayed on either bacteriophage or adeno-associated virus/phage (AAVP) particles or loop-grafted onto a human antibody fragment specifically targets orthotopic IBC and other aggressive breast cancer models in vivo. To evaluate the theranostic value, we used GRP78-targeting AAVP particles to deliver the human Herpes simplex virus thymidine kinase type-1 (HSVtk) transgene, obtaining simultaneous in vivo diagnosis through PET imaging and tumor treatment by selective activation of the prodrug ganciclovir at tumor sites. Translation of this AAVP system is expected simultaneously to image, monitor, and treat the IBC phenotype and possibly other aggressive (e.g., invasive and/or metastatic) subtypes of breast cancer, based on the inducible cell-surface expression of the stress-response chaperone GRP78, and possibily other cell-surface receptors in human tumors.

17.
Proc Natl Acad Sci U S A ; 113(45): 12786-12791, 2016 Nov 08.
Artigo em Inglês | MEDLINE | ID: mdl-27791181

RESUMO

Aggressive variant prostate cancers (AVPC) are a clinically defined group of tumors of heterogeneous morphologies, characterized by poor patient survival and for which limited diagnostic and treatment options are currently available. We show that the cell surface 78-kDa glucose-regulated protein (GRP78), a receptor that binds to phage-display-selected ligands, such as the SNTRVAP motif, is a candidate target in AVPC. We report the presence and accessibility of this receptor in clinical specimens from index patients. We also demonstrate that human AVPC cells displaying GRP78 on their surface could be effectively targeted both in vitro and in vivo by SNTRVAP, which also enabled specific delivery of siRNA species to tumor xenografts in mice. Finally, we evaluated ligand-directed strategies based on SNTRVAP-displaying adeno-associated virus/phage (AAVP) particles in mice bearing MDA-PCa-118b, a patient-derived xenograft (PDX) of castration-resistant prostate cancer bone metastasis that we exploited as a model of AVPC. For theranostic (a merging of the terms therapeutic and diagnostic) studies, GRP78-targeting AAVP particles served to deliver the human Herpes simplex virus thymidine kinase type-1 (HSVtk) gene, which has a dual function as a molecular-genetic sensor/reporter and a cell suicide-inducing transgene. We observed specific and simultaneous PET imaging and treatment of tumors in this preclinical model of AVPC. Our findings demonstrate the feasibility of GPR78-targeting, ligand-directed theranostics for translational applications in AVPC.

18.
PLoS One ; 11(8): e0160701, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27513941

RESUMO

The role of contaminated preservation fluid in the development of infection after liver transplantation has not been fully elucidated. To assess the incidence and etiology of contaminated preservation fluid and determine its impact on the subsequent development of infection after liver transplantation, we prospectively studied 50 consecutive liver transplants, and cultured the following samples in each instance: preservation fluid (immediately before and at the end of the back-table procedure, and just before implantation), blood, and bile from the donor, and ascitic fluid from the recipient. When any culture was positive, blood cultures were obtained and targeted antimicrobial therapy was started. We found that the incidence of contaminated preservation fluid was 92% (46 of 50 cases of liver transplantation per year), but only 28% (14/50) were contaminated by recognized pathogens. Blood and bile cultures from the donor were positive in 28% and 6% respectively, whereas ascitic fluid was positive in 22%. The most frequently isolated microorganisms were coagulase-negative staphylococci. In nine cases, the microorganisms isolated from the preservation fluid concurred with those grown from the donor blood cultures, and in one case, the isolate matched with the one obtained from bile culture. No liver transplant recipient developed an infection due to the transmission of an organism isolated from the preservation fluid. Our findings indicate that contamination of the preservation fluid is frequent in liver transplantation, and it is mainly caused by saprophytic skin flora. Transmission of infection is low, particularly among those recipients given targeted antimicrobial treatment for organisms isolated in the preservation fluid.


Assuntos
Bactérias/isolamento & purificação , Infecções Bacterianas/epidemiologia , Infecções Bacterianas/etiologia , Contaminação de Medicamentos , Transplante de Fígado , Soluções para Preservação de Órgãos , Bactérias/classificação , Humanos , Incidência , Estudos Prospectivos , Espanha/epidemiologia
20.
Am J Pathol ; 186(8): 2162-2170, 2016 08.
Artigo em Inglês | MEDLINE | ID: mdl-27317903

RESUMO

We previously isolated an IL-11-mimic motif (CGRRAGGSC) that binds to IL-11 receptor (IL-11R) in vitro and accumulates in IL-11R-expressing tumors in vivo. This synthetic peptide ligand was used as a tumor-targeting moiety in the rational design of BMTP-11, which is a drug candidate in clinical trials. Here, we investigated the specificity and accessibility of IL-11R as a target and the efficacy of BMTP-11 as a ligand-targeted drug in lung cancer. We observed high IL-11R expression levels in a large cohort of patients (n = 368). In matching surgical specimens (i.e., paired tumors and nonmalignant tissues), the cytoplasmic levels of IL-11R in tumor areas were significantly higher than in nonmalignant tissues (n = 36; P = 0.003). Notably, marked overexpression of IL-11R was observed in both tumor epithelial and vascular endothelial cell membranes (n = 301; P < 0.0001). BMTP-11 induced in vitro cell death in a representative panel of human lung cancer cell lines. BMTP-11 treatment attenuated the growth of subcutaneous xenografts and reduced the number of pulmonary tumors after tail vein injection of human lung cancer cells in mice. Our findings validate BMTP-11 as a pharmacologic candidate drug in preclinical models of lung cancer and patient-derived tumors. Moreover, the high expression level in patients with non-small cell lung cancer is a promising feature for potential translational applications.


Assuntos
Antineoplásicos/farmacologia , Biomarcadores Tumorais/análise , Carcinoma/patologia , Neoplasias Pulmonares/patologia , Peptídeos/farmacologia , Receptores de Interleucina-11/biossíntese , Animais , Apoptose/efeitos dos fármacos , Carcinoma/metabolismo , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Feminino , Citometria de Fluxo , Humanos , Imuno-Histoquímica , Neoplasias Pulmonares/metabolismo , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Nus , Estudos Retrospectivos , Análise Serial de Tecidos , Ensaios Antitumorais Modelo de Xenoenxerto
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