Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 29
Filtrar
1.
Cancer Discov ; 2024 Apr 08.
Artigo em Inglês | MEDLINE | ID: mdl-38591846

RESUMO

Cancer cells exhibit phenotypical plasticity and epigenetic reprogramming, which allows them to evade lineage-dependent targeted treatments by adopting lineage plasticity. The underlying mechanisms by which cancer cells exploit the epigenetic regulatory machinery to acquire lineage plasticity and therapy resistance remain poorly understood. We identified Zinc Finger Protein 397 (ZNF397) as a bona fide coactivator of the androgen receptor (AR), essential for the transcriptional program governing AR-driven luminal lineage. ZNF397 deficiency facilitates the transition of cancer cell from an AR-driven luminal lineage to a Ten-Eleven Translocation 2 (TET2)-driven lineage plastic state, ultimately promoting resistance to therapies inhibiting AR signaling. Intriguingly, our findings indicate that a TET2 inhibitor can eliminate the resistance to AR targeted therapies in ZNF397-deficient tumors. These insights uncover a novel mechanism through which prostate cancer acquires lineage plasticity via epigenetic rewiring and offer promising implications for clinical interventions designed to overcome therapy resistance dictated by lineage plasticity.

2.
bioRxiv ; 2023 Oct 27.
Artigo em Inglês | MEDLINE | ID: mdl-37961351

RESUMO

Cancer cells exhibit phenotypical plasticity and epigenetic reprogramming, which allows them to evade lineage-dependent targeted treatments by adopting lineage plasticity. The underlying mechanisms by which cancer cells exploit the epigenetic regulatory machinery to acquire lineage plasticity and therapy resistance remain poorly understood. We identified Zinc Finger Protein 397 (ZNF397) as a bona fide co-activator of the androgen receptor (AR), essential for the transcriptional program governing AR-driven luminal lineage. ZNF397 deficiency facilitates the transition of cancer cell from an AR-driven luminal lineage to a Ten-Eleven Translocation 2 (TET2)-driven lineage plastic state, ultimately promoting resistance to therapies inhibiting AR signaling. Intriguingly, our findings indicate that TET2 inhibitor can eliminate the AR targeted therapies resistance in ZNF397-deficient tumors. These insights uncover a novel mechanism through which prostate and breast cancers acquire lineage plasticity via epigenetic rewiring and offer promising implications for clinical interventions designed to overcome therapy resistance dictated by lineage plasticity. Statement of Significance: This study reveals a novel epigenetic mechanism regulating tumor lineage plasticity and therapy response, enhances understanding of drug resistance and unveils a new therapeutic strategy for prostate cancer and other malignancies. Our findings also illuminate TET2's oncogenic role and mechanistically connect TET2-driven epigenetic rewiring to lineage plasticity and therapy resistance.

3.
Proc Natl Acad Sci U S A ; 120(24): e2219404120, 2023 06 13.
Artigo em Inglês | MEDLINE | ID: mdl-37276413

RESUMO

Nogo-66 receptor 1 (NgR1) binds a variety of structurally dissimilar ligands in the adult central nervous system to inhibit axon extension. Disruption of ligand binding to NgR1 and subsequent signaling can improve neuron outgrowth, making NgR1 an important therapeutic target for diverse neurological conditions such as spinal crush injuries and Alzheimer's disease. Human NgR1 serves as a receptor for mammalian orthoreovirus (reovirus), but the mechanism of virus-receptor engagement is unknown. To elucidate how NgR1 mediates cell binding and entry of reovirus, we defined the affinity of interaction between virus and receptor, determined the structure of the virus-receptor complex, and identified residues in the receptor required for virus binding and infection. These studies revealed that central NgR1 surfaces form a bridge between two copies of viral capsid protein σ3, establishing that σ3 serves as a receptor ligand for reovirus. This unusual binding interface produces high-avidity interactions between virus and receptor to prime early entry steps. These studies refine models of reovirus cell-attachment and highlight the evolution of viruses to engage multiple receptors using distinct capsid components.


Assuntos
Orthoreovirus , Reoviridae , Animais , Humanos , Receptor Nogo 1/metabolismo , Ligação Viral , Proteínas Virais/metabolismo , Ligantes , Reoviridae/metabolismo , Orthoreovirus/metabolismo , Receptores Virais/metabolismo , Mamíferos/metabolismo
4.
Langenbecks Arch Surg ; 408(1): 198, 2023 May 19.
Artigo em Inglês | MEDLINE | ID: mdl-37204475

RESUMO

PURPOSE: This study aimed to reveal the role of preoperative main pancreatic duct (MPD) stent placement in reducing the intraoperative main pancreatic duct injury rate and the incidence of postoperative pancreatic leakage following pancreatic tumor enucleation. METHODS: A retrospective cohort analysis was performed for all patients with benign/borderline pancreatic head tumors who were treated with enucleation. The patients were divided into two groups (standard vs. stent) depending on whether they underwent main pancreatic duct stent placement prior to surgery. RESULTS: Thirty-three patients were finally included in the analytical cohort. Compared with the standard group, patients in the stent group had a shorter distance between tumors and main pancreatic duct (p=0.01) and presented with larger tumors (p<0.01). The rates of POPF (grade B&C) were 39.1% (9/23) and 20% (2/10) in the standard and stent groups, respectively (p<0.01). Major postoperative complications occurred more frequently in the standard group than in the stent group (14 versus 2; p<0.01). No significant differences in mortality, in-hospital stay or medical cost were observed between the two groups (p>0.05). CONCLUSIONS: MPD stent placement prior to surgery may facilitate pancreatic tumor enucleation, minimize MPD injury and decrease the occurrence of postoperative fistula.


Assuntos
Neoplasias de Cabeça e Pescoço , Neoplasias Pancreáticas , Humanos , Estudos de Coortes , Fístula Pancreática/epidemiologia , Fístula Pancreática/etiologia , Fístula Pancreática/cirurgia , Estudos Retrospectivos , Ductos Pancreáticos/cirurgia , Ductos Pancreáticos/patologia , Neoplasias Pancreáticas/patologia , Complicações Pós-Operatórias/etiologia , Stents/efeitos adversos , Neoplasias de Cabeça e Pescoço/complicações , Neoplasias de Cabeça e Pescoço/patologia , Neoplasias de Cabeça e Pescoço/cirurgia , Pancreaticoduodenectomia/efeitos adversos
5.
BMC Gastroenterol ; 23(1): 35, 2023 Feb 08.
Artigo em Inglês | MEDLINE | ID: mdl-36755224

RESUMO

BACKGROUND: We aimed to verify the role of hENT1 as a prognostic predictor for patients with resectable pancreatic ductal adenocarcinoma (PDAC) who underwent radical resection followed by intra-arterial infusion of gemcitabine-based regimen. METHODS: We collected surgical samples from 102 patients with resectable PDAC who received radical resection followed by intra-arterial infusion of gemcitabine-based regimen. The hENT1 expression with the help of immunohistochemistry was conducted using formalin-fixed and paraffin embedded tissues. The Kaplan-Meier analyses and Cox regression were used to evaluate the mortality hazard associated with the discrepancy between strong and weak of hENT1 expression. Patients' clinical and pathological characteristics were compared between the two groups, then the role of hENT1 as a prognostic predictor was further explored. RESULTS: A total of 102 patients were included to assess the hENT1 expression. 50 patients were classified into high hENT1 expression group, the other 52 patients were attributed into low hENT1 expression group. High hENT1 expression was related to a significantly improved overall survival (OS) (p = 0.014) and disease-free survival (DFS) (p = 0.004). Both univariate (p = 0.001) and multivariate analyses (p < 0.001) indicated that high hENT1 expression was related to a decreased mortality. CONCLUSIONS: High expression of hENT1 is positive prognostic factor for adjuvant intra-arterial gemcitabine-based chemotherapy in resectable PDAC.


Assuntos
Carcinoma Ductal Pancreático , Neoplasias Pancreáticas , Humanos , Gencitabina , Desoxicitidina/uso terapêutico , Antimetabólitos Antineoplásicos/uso terapêutico , Neoplasias Pancreáticas/tratamento farmacológico , Neoplasias Pancreáticas/cirurgia , Neoplasias Pancreáticas/patologia , Quimioterapia Adjuvante , Carcinoma Ductal Pancreático/tratamento farmacológico , Carcinoma Ductal Pancreático/cirurgia , Neoplasias Pancreáticas
6.
iScience ; 25(11): 105321, 2022 Nov 18.
Artigo em Inglês | MEDLINE | ID: mdl-36325049

RESUMO

We report the quaternary structure of core transcriptional complex for the full-length human progesterone receptor-B (PR-B) homodimer with primary coactivator steroid receptor coactivator-2 (SRC-2) and the secondary coactivator p300/CREB-binding protein (CBP). The PR-B homodimer engages one SRC-2 mainly through its activation function 1 (AF1) in N-terminus. SRC-2 is positioned between PR-B and p300 leaving space for direct interaction between PR-B and p300 through PR-B's C-terminal AF2 and its unique AF3. Direct AF3/p300 interaction provides long-desired structural insights into the known functional differences between PR-B and the PR-A isoform lacking AF3. We reveal the contributions of each AF and demonstrate their structural basis in forming the PR-B dimer interface and PR-B/coactivator complex. Comparison of the PR-B/coactivator complex with other steroid receptor (estrogen receptor and androgen receptor) complexes also shows that each receptor has its unique mechanism for recruiting coactivators due to the highly variable N-termini among receptors.

7.
Essays Biochem ; 65(6): 857-866, 2021 12 17.
Artigo em Inglês | MEDLINE | ID: mdl-34061186

RESUMO

Steroid receptors activate gene transcription through recruitment of a number of coregulators to facilitate histone modification, chromatin remodeling, and general transcription machinery stabilization. Understanding the structures of full-length steroid receptor and coregulatory complexes has been difficult due to their large molecular sizes and dynamic structural conformations. Recent developments in cryo-electron microscopy (cryoEM) technology and proteomics have advanced the structural studies of steroid receptor complexes. Here, we will review the insights we learned from cryoEM studies of the estrogen and androgen receptor transcriptional complexes. Despite similar domain organizations, the two receptors have different coregulator interaction modes. The cryoEM structures now have revealed the fundamental differences between the two receptors and their functional mechanisms.


Assuntos
Montagem e Desmontagem da Cromatina , Processamento de Proteína Pós-Traducional , Proteínas de Transporte/metabolismo , Microscopia Crioeletrônica , Proteômica
8.
Mol Cell ; 79(5): 812-823.e4, 2020 09 03.
Artigo em Inglês | MEDLINE | ID: mdl-32668201

RESUMO

Steroid receptors activate gene transcription by recruiting coactivators to initiate transcription of their target genes. For most nuclear receptors, the ligand-dependent activation function domain-2 (AF-2) is a primary contributor to the nuclear receptor (NR) transcriptional activity. In contrast to other steroid receptors, such as ERα, the activation function of androgen receptor (AR) is largely dependent on its ligand-independent AF-1 located in its N-terminal domain (NTD). It remains unclear why AR utilizes a different AF domain from other receptors despite that NRs share similar domain organizations. Here, we present cryoelectron microscopy (cryo-EM) structures of DNA-bound full-length AR and its complex structure with key coactivators, SRC-3 and p300. AR dimerization follows a unique head-to-head and tail-to-tail manner. Unlike ERα, AR directly contacts a single SRC-3 and p300. The AR NTD is the primary site for coactivator recruitment. The structures provide a basis for understanding assembly of the AR:coactivator complex and its domain contributions for coactivator assembly and transcriptional regulation.


Assuntos
DNA/química , Proteína p300 Associada a E1A/metabolismo , Coativador 3 de Receptor Nuclear/metabolismo , Receptores Androgênicos/metabolismo , Microscopia Crioeletrônica , DNA/metabolismo , Proteína p300 Associada a E1A/química , Células HEK293 , Humanos , Coativador 3 de Receptor Nuclear/química , Conformação de Ácido Nucleico , Conformação Proteica , Receptores Androgênicos/química , Receptores Androgênicos/genética , Proteínas Recombinantes/química , Proteínas Recombinantes/metabolismo
9.
Sci Adv ; 6(16): eaay6410, 2020 04.
Artigo em Inglês | MEDLINE | ID: mdl-32494598

RESUMO

In many viruses, including rotavirus (RV), the major pathogen of infantile gastroenteritis, capping of viral messenger RNAs is a pivotal step for efficient translation of the viral genome. In RV, VP3 caps the nascent transcripts synthesized from the genomic dsRNA segments by the RV polymerase VP1 within the particle core. Here, from cryo-electron microscopy, x-ray crystallography, and biochemical analyses, we show that VP3 forms a stable tetrameric assembly with each subunit having a modular domain organization, which uniquely integrates five distinct enzymatic steps required for capping the transcripts. In addition to the previously known guanylyl- and methyltransferase activities, we show that VP3 exhibits hitherto unsuspected RNA triphosphatase activity necessary for initiating transcript capping and RNA helicase activity likely required for separating the RNA duplex formed transiently during endogenous transcription. From our studies, we propose a new mechanism for how VP3 inside the virion core caps the nascent transcripts exiting from the polymerase.


Assuntos
Rotavirus , Proteínas do Capsídeo/metabolismo , Microscopia Crioeletrônica , Genoma Viral , Nucleotidiltransferases/metabolismo , RNA Viral/genética , Rotavirus/genética , Rotavirus/metabolismo , Vírion/metabolismo
10.
Nat Commun ; 10(1): 3130, 2019 07 16.
Artigo em Inglês | MEDLINE | ID: mdl-31311931

RESUMO

Single-stranded RNA bacteriophages (ssRNA phages) infect Gram-negative bacteria via a single maturation protein (Mat), which attaches to a retractile pilus of the host. Here we present structures of the ssRNA phage MS2 in complex with the Escherichia coli F-pilus, showing a network of hydrophobic and electrostatic interactions at the Mat-pilus interface. Moreover, binding of the pilus induces slight orientational variations of the Mat relative to the rest of the phage capsid, priming the Mat-connected genomic RNA (gRNA) for its release from the virions. The exposed tip of the attached Mat points opposite to the direction of the pilus retraction, which may facilitate the translocation of the gRNA from the capsid into the host cytosol. In addition, our structures determine the orientation of the assembled F-pilin subunits relative to the cell envelope, providing insights into the F-like type IV secretion systems.


Assuntos
Escherichia coli/virologia , Levivirus/ultraestrutura , Parede Celular/metabolismo , Parede Celular/ultraestrutura , Parede Celular/virologia , Microscopia Crioeletrônica , Escherichia coli/ultraestrutura , Proteínas de Escherichia coli/metabolismo , Proteínas de Escherichia coli/ultraestrutura , Proteínas de Fímbrias/metabolismo , Proteínas de Fímbrias/ultraestrutura , Fímbrias Bacterianas/metabolismo , Fímbrias Bacterianas/ultraestrutura , Fímbrias Bacterianas/virologia , Levivirus/genética , RNA Guia de Cinetoplastídeos/metabolismo , RNA Viral/metabolismo , Proteínas Virais/ultraestrutura
11.
J Oncol ; 2018: 6273947, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30538745

RESUMO

PURPOSE: Nonsurgical therapies, including biotherapy, chemotherapy, and liver-directed therapy, provided a limit survival benefit for PNET patients with hepatic metastases. With the development of liver resection technique, there was a controversy on whether to perform a liver resection for these patients. METHODS: A computerized search was made of the Medline/PubMed, EMbase, Cochrane Library, and SinoMed (CBM) before March 2018. A meta-analysis was performed to investigate the differences in the efficacy of liver resection and nonliver resection treatments based on the evaluation of morbidity, 30-day mortality, symptom relief rate, and 1-, 3-, and 5-year survival. Two investigators reviewed all included articles and extracted the data of them. The meta-analysis was performed via Review Manager 5.3 software. RESULTS: A total of 13 cohort studies with 1524 patients were included in this meta-analysis. Compared with the nonliver resection group, liver resection group had a longer 1-, 3-, and 5-year survival time and a higher symptom relief with an acceptable mortality and morbidity. CONCLUSIONS: Liver resection is a safe treatment and could significantly prolong the long-term prognosis for highly selected patients with resectable liver metastases from PNET. Further randomized, controlled trials are needed.

12.
Int J Nanomedicine ; 13: 4869-4880, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30214194

RESUMO

PURPOSE: Gemcitabine is currently the standard first-line chemotherapeutic drug for treating pancreatic cancer. However, many factors can contribute to gemcitabine resistance. One of the most important reasons is the low hENT1 expression. In this study, we tested the antitumor effect of gemcitabine-loaded human serum albumin nanoparticle (GEM-HSA-NP) on gemcitabine-resistant pancreatic cancer induced by low hENT1 expression. MATERIALS AND METHODS: S-(4-nitrobenzyl)-6-thioinosine was utilized to inhibit the activity of hENT1 and simulate low hENT1 expression. Growth inhibition assays and cell cycle and apoptosis analyses were performed on human pancreatic cancer cell lines such as BxPC-3 and SW1990. The in vivo antitumor effect was studied by using patient-derived xenograft (PDX) models. The in vivo toxicity assessment was performed on healthy Kunming mice. RESULTS: In in vitro studies, GEM-HSA-NP showed its ability to inhibit cell proliferation, arrest cell cycle and induce apoptosis when tumor cells were resistant to gemcitabine. In in vivo studies, GEM-HSA-NP was more effective than gemcitabine on inhibiting tumor growth whether the expression levels of hENT1 were high or low in PDX models. The in vivo toxicity assessment showed that the biotoxicity of GEM-HSA-NP did not increase compared with gemcitabine. CONCLUSION: GEM-HSA-NP can overcome gemcitabine resistance induced by low hENT1 expression, which suggests its potential role for the clinical application.


Assuntos
Albuminas/química , Antineoplásicos/uso terapêutico , Desoxicitidina/análogos & derivados , Resistencia a Medicamentos Antineoplásicos , Transportador Equilibrativo 1 de Nucleosídeo/metabolismo , Nanopartículas/química , Neoplasias Pancreáticas/tratamento farmacológico , Animais , Antineoplásicos/farmacologia , Apoptose/efeitos dos fármacos , Peso Corporal/efeitos dos fármacos , Pontos de Checagem do Ciclo Celular/efeitos dos fármacos , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Desoxicitidina/farmacologia , Desoxicitidina/uso terapêutico , Resistencia a Medicamentos Antineoplásicos/efeitos dos fármacos , Humanos , Camundongos , Neoplasias Pancreáticas/patologia , Carga Tumoral/efeitos dos fármacos , Ensaios Antitumorais Modelo de Xenoenxerto , Gencitabina
13.
Int J Surg ; 48: 149-154, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-29081375

RESUMO

OBJECTIVE: The objectives of this systematic review and meta-analysis were to examine morbidity, mortality, and long-term survival after surgical resection of hepatic metastases from pancreatic ductal adenocarcinoma (PDAC) patients. BACKGROUND: Patients with hepatic metastases from pancreatic ductal adenocarcinoma are facing a dilemma of whether to make hepatic resection. METHODS: A systematic literature research was undertaken through computerized databases as well as manually research from unpublished data. A meta-analysis was performed to investigate the differences in the efficacy of liver resection and non-surgical treatments based on the evaluation of morbidity, 30-day mortality, and 1-, 3-, or 5-year survival. RESULTS: 11 cohort studies with 1147 patients were identified in the pool. Compared with the non-surgical approach, hepatic resection can be performed in a safe and feasible manner for all pancreatic cancer patients with liver metastases (p = 0.13 for overall morbidity; p = 0.63 for mortality). For surgical group, the median 1-year, 3-year, and 5-year survival were 40.9%, 13.3%, 2.9%, respectively, with a median survival of 9.9 months. Surgical resection of hepatic metastases was associated with a significantly improved overall 1-year and 3-year survival (p < 0.001). CONCLUSIONS: Hepatic resection is a safe procedure; furthermore, it is worth doing such an extended surgery for PDAC patients due to additional survival benefit in the medium-term (less than 3 years). However, further randomized, controlled trials are urgently needed.


Assuntos
Carcinoma Ductal Pancreático/cirurgia , Hepatectomia/mortalidade , Neoplasias Hepáticas/cirurgia , Neoplasias Pancreáticas/cirurgia , Idoso , Carcinoma Ductal Pancreático/secundário , Feminino , Hepatectomia/métodos , Humanos , Neoplasias Hepáticas/secundário , Masculino , Pessoa de Meia-Idade , Neoplasias Pancreáticas/patologia , Taxa de Sobrevida , Resultado do Tratamento
14.
Int J Nanomedicine ; 12: 6771-6785, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28979117

RESUMO

Lymphatic metastasis is the major metastatic pattern of pancreatic cancer and considered as an independent risk factor of survival. However, there is still no effective way for the diagnosis and treatment for lymphatic metastases of pancreatic cancer. In this study, using albumin as a carrier of gemcitabine (Gem), further modified by pyropheophorbide-a, we have designed and synthesized a nanoparticle (NP) compound named "pheophorbide-a (P@)-Gem-human serum albumin (HSA)-NPs". By utilization of its tracer ability of lymphatic metastases, which is triggered by near-infrared irradiation and its visible dying ability, the compound is used for drug delivery tracking, meanwhile as a treating drug, as well as the combined effect of photodynamic therapy and chemotherapy. By the nude mice model of lymphatic metastases of pancreatic cancer (BxPC-3-LN7), we aim to explore the feasibility, effectiveness, and biological safety of diagnosis and treatment for the lymphatic metastases of pancreatic cancer by P@-Gem-HSA-NP, thereby, providing new methods and strategies for the study of nanodrug carrier and research on lymphatic metastases of pancreatic cancer.


Assuntos
Sistemas de Liberação de Medicamentos/métodos , Nanopartículas/química , Neoplasias Pancreáticas/tratamento farmacológico , Fotoquimioterapia/métodos , Albumina Sérica Humana/uso terapêutico , Animais , Antimetabólitos Antineoplásicos/administração & dosagem , Linhagem Celular Tumoral , Desoxicitidina/administração & dosagem , Desoxicitidina/análogos & derivados , Humanos , Metástase Linfática/patologia , Camundongos Endogâmicos BALB C , Camundongos Endogâmicos C57BL , Camundongos Nus , Nanopartículas/uso terapêutico , Neoplasias Pancreáticas/patologia , Albumina Sérica Humana/química , Ensaios Antitumorais Modelo de Xenoenxerto , Gencitabina
15.
Cell Res ; 27(8): 1020-1033, 2017 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-28621327

RESUMO

The Escherichia coli uracil:proton symporter UraA is a prototypical member of the nucleobase/ascorbate transporter (NAT) or nucleobase/cation symporter 2 (NCS2) family, which corresponds to the human solute carrier family SLC23. UraA consists of 14 transmembrane segments (TMs) that are organized into two distinct domains, the core domain and the gate domain, a structural fold that is also shared by the SLC4 and SLC26 transporters. Here we present the crystal structure of UraA bound to uracil in an occluded state at 2.5 Å resolution. Structural comparison with the previously reported inward-open UraA reveals pronounced relative motions between the core domain and the gate domain as well as intra-domain rearrangement of the gate domain. The occluded UraA forms a dimer in the structure wherein the gate domains are sandwiched by two core domains. In vitro and in vivo biochemical characterizations show that UraA is at equilibrium between dimer and monomer in all tested detergent micelles, while dimer formation is necessary for the transport activity. Structural comparison between the dimeric UraA and the recently reported inward-facing dimeric UapA provides important insight into the transport mechanism of SLC23 transporters.


Assuntos
Escherichia coli O157/química , Proteínas de Escherichia coli/química , Proteínas de Membrana Transportadoras/química , Multimerização Proteica , Proteínas de Transporte de Ânions/química , Proteínas de Transporte de Ânions/genética , Escherichia coli O157/genética , Proteínas de Escherichia coli/genética , Humanos , Proteínas de Membrana Transportadoras/genética , Domínios Proteicos , Estrutura Quaternária de Proteína , Homologia Estrutural de Proteína
16.
Hepatobiliary Pancreat Dis Int ; 16(1): 104-109, 2017 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-28119265

RESUMO

BACKGROUND: Previous researches in pancreatic cancer demonstrated a negative correlation between secreted protein acidic and rich in cysteine (SPARC) expression in primary tumor and survival, but not for SPARC expression in lymph node. In the present study, we aimed to evaluate the SPARC expression in various types of tissues and its impact on patients' prognosis. METHODS: The expression of SPARC was examined by immunohistochemistry in resected pancreatic cancer specimens. Kaplan-Meier analyses and Cox proportional hazards regression were applied to assess the mortality risk. RESULTS: A total of 222 tissue samples from 73 patients were collected to evaluate the SPARC expression, which included 73 paired primary tumor and adjacent normal tissues, 38 paired metastatic and normal lymph nodes. The proportion of positive SPARC expression in metastatic lymph node was high (32/38), whereas in normal lymph node it was negative (0/38). Positive SPARC expression in primary tumor cells was associated with a significantly decreased overall survival (P=0.007) and disease-free survival (P=0.003), whereas in other types of tissues it did not show a predictive role for prognosis. Univariate and multivariate analyses both confirmed this significance. CONCLUSION: SPARC can serve a dual function role as both predictor for prognosis and potentially biomarker for lymph node metastasis in resected pancreatic cancer patients.


Assuntos
Biomarcadores Tumorais/análise , Carcinoma Ductal Pancreático/química , Linfonodos/química , Osteonectina/análise , Neoplasias Pancreáticas/química , Adulto , Idoso , Idoso de 80 Anos ou mais , Carcinoma Ductal Pancreático/mortalidade , Carcinoma Ductal Pancreático/secundário , Carcinoma Ductal Pancreático/cirurgia , Feminino , Humanos , Imuno-Histoquímica , Estimativa de Kaplan-Meier , Excisão de Linfonodo , Linfonodos/patologia , Linfonodos/cirurgia , Metástase Linfática , Masculino , Pessoa de Meia-Idade , Pancreatectomia , Neoplasias Pancreáticas/mortalidade , Neoplasias Pancreáticas/patologia , Neoplasias Pancreáticas/cirurgia , Modelos de Riscos Proporcionais , Estudos Retrospectivos , Fatores de Risco , Fatores de Tempo , Resultado do Tratamento
17.
Sci Rep ; 6: 31539, 2016 08 12.
Artigo em Inglês | MEDLINE | ID: mdl-27515795

RESUMO

The emerging albumin nanoparticle brings new hope for the delivery of antitumor drugs. However, a lack of robust tumor targeting greatly limits its application. In this paper, cyclic arginine-glycine-aspartic-conjugated, gemcitabine-loaded human serum albumin nanoparticles (cRGD-Gem-HSA-NPs) were successfully prepared, characterized, and tested in vitro in the BxPC-3 cell line. Initially, 4-N-myristoyl-gemcitabine (Gem-C14) was formed by conjugating myristoyl to the 4-amino group of gemcitabine. Then, cRGD-HSA was synthesized using sulfosuccinimidyl-(4-N-maleimidomethyl)cyclohexane-1-carboxylate (Sulfo-SMCC) cross-linkers. Finally, cRGD-Gem-HSA-NPs were formulated based on the nanoparticle albumin-bound (nab) technology. The resulting NPs were characterized for particle size, zeta potential, morphology, encapsulation efficiency, and drug loading efficiency. In vitro cellular uptake and inhibition studies were conducted to compare Gem-HSA-NPs and cRGD-Gem-HSA-NPs in a human pancreatic cancer cell line (BxPC-3). The cRGD-Gem-HSA-NPs exhibited an average particle size of 160 ± 23 nm. The encapsulation rate and drug loading rate were approximately 83 ± 5.6% and 11 ± 4.2%, respectively. In vitro, the cRGD-anchored NPs exhibited a significantly greater affinity for the BxPC-3 cells compared to non-targeted NPs and free drug. The cRGD-Gem-HSA-NPs also showed the strongest inhibitory effect in the BxPC-3 cells among all the analyzed groups. The improved efficacy of cRGD-Gem-HSA-NPs in the BxPC-3 cell line warrants further in vivo investigations.


Assuntos
Albuminas , Desoxicitidina/análogos & derivados , Sistemas de Liberação de Medicamentos/métodos , Nanopartículas , Neoplasias Pancreáticas/tratamento farmacológico , Peptídeos Cíclicos , Albuminas/química , Albuminas/farmacocinética , Albuminas/farmacologia , Linhagem Celular Tumoral , Desoxicitidina/química , Desoxicitidina/farmacocinética , Desoxicitidina/farmacologia , Humanos , Nanopartículas/química , Nanopartículas/uso terapêutico , Neoplasias Pancreáticas/metabolismo , Neoplasias Pancreáticas/patologia , Peptídeos Cíclicos/química , Peptídeos Cíclicos/farmacocinética , Peptídeos Cíclicos/farmacologia , Gencitabina
18.
Photochem Photobiol ; 92(2): 325-330, 2016 03.
Artigo em Inglês | MEDLINE | ID: mdl-26833269

RESUMO

For most cancer patients, the presence of metastatic lymph nodes usually indicates regional recurrence and poor prognosis. Therefore, lymph node mapping is a requisite for disease staging, prognosis prediction and decision making in the treatment of cancer. Deuteporfin, a second-generation photosensitizer, has a maximum excitation wavelength that can reach the near infrared (NIR) region (650-700 nm). We aimed to take advantage of these aspects of deuteporfin and use it as a fluorescent probe for metastatic lymph node mapping in vivo using NIR fluorescent imaging. In our study, we further investigated whether a photosensitizer could be used as a tracer for metastatic lymph node mapping of pancreatic cancer based on previous reports. Compared to normal tissues, tumor tissues including primary tumors and metastatic lymph nodes had a higher uptake ability of deuteporfin (P < 0.05). Our research confirmed this targeting property of deuteporfin using in vivo fluorescent imaging. Consistent with observations from in vivo imaging experiments, frozen sections of metastatic lymph nodes intuitively displayed significantly higher and wider distributions of deuteporfin than normal sections.


Assuntos
Linfonodos/patologia , Metástase Neoplásica/diagnóstico por imagem , Neoplasias Experimentais/diagnóstico por imagem , Neoplasias Pancreáticas/patologia , Fármacos Fotossensibilizantes/farmacologia , Animais , Linhagem Celular Tumoral , Humanos , Camundongos , Neoplasias Pancreáticas/diagnóstico por imagem , Distribuição Aleatória
19.
Expert Rev Anticancer Ther ; 16(3): 359-71, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-26781307

RESUMO

L1 cell adhesion molecule (L1CAM) is the prototype member of the L1-family of closely related neural adhesion molecules. L1CAM is differentially expressed in the normal nervous system as well as pathological tissues and displays a wide range of biological activities. In human malignancies, L1CAM plays a vital role in tumor growth, invasion and metastasis. Recently, increasing evidence has suggested that L1CAM exerts a variety of functions at different steps of tumor progression through a series of signaling pathways. In addition, L1CAM has been identified as a promising target for cancer therapy by using synthetic and natural inhibitors. In this review, we provide an up-to-date overview of the role of L1CAM involved in cancers and the rationale for L1CAM as a novel molecular target for cancer therapy.


Assuntos
Terapia de Alvo Molecular , Neoplasias/tratamento farmacológico , Molécula L1 de Adesão de Célula Nervosa/antagonistas & inibidores , Animais , Antineoplásicos/farmacologia , Progressão da Doença , Humanos , Invasividade Neoplásica , Metástase Neoplásica , Neoplasias/patologia , Molécula L1 de Adesão de Célula Nervosa/metabolismo , Transdução de Sinais/fisiologia
20.
J Mater Sci Mater Med ; 27(1): 4, 2016 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-26610927

RESUMO

Over the past three decades, tremendous progress has been made in cancer prevention and treatment. Despite these advances, a substantial number of cancer cases experience early recurrence and metastases. Thus, the better management of cancer, especially developing more effective drugs for combating cancer cells, is an arduous task. Albumin-based nanoparticles are emerging as a promising approach to replace the traditional way of carrying therapeutic drugs to a tumor site. In this review, we describe the basic knowledge on albumin-based nanoparticles, recent progress of using albumin-based nanoparticles in the diagnosis and treatment of cancer, and the application of nanoparticle albumin bound (Nab) paclitaxel for the treatment of lung, breast and pancreatic cancer. Last but not least, we try to discuss future goals and perspectives in the field of drug delivery research, thereby facilitating the antitumor activity.


Assuntos
Albuminas/uso terapêutico , Nanopartículas , Neoplasias/tratamento farmacológico
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...