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1.
Hum Genomics ; 15(1): 72, 2021 12 20.
Artigo em Inglês | MEDLINE | ID: mdl-34930489

RESUMO

BACKGROUND: Due to the limitations of the current routine diagnostic methods, low-level somatic mosaicism with variant allele fraction (VAF) < 10% is often undetected in clinical settings. To date, only a few studies have attempted to analyze tissue distribution of low-level parental mosaicism in a large clinical exome sequencing (ES) cohort. METHODS: Using a customized bioinformatics pipeline, we analyzed apparent de novo single-nucleotide variants or indels identified in the affected probands in ES trio data at Baylor Genetics clinical laboratories. Clinically relevant variants with VAFs between 30 and 70% in probands and lower than 10% in one parent were studied. DNA samples extracted from saliva, buccal cells, redrawn peripheral blood, urine, hair follicles, and nail, representing all three germ layers, were tested using PCR amplicon next-generation sequencing (amplicon NGS) and droplet digital PCR (ddPCR). RESULTS: In a cohort of 592 clinical ES trios, we found 61 trios, each with one parent suspected of low-level mosaicism. In 21 parents, the variants were validated using amplicon NGS and seven of them by ddPCR in peripheral blood DNA samples. The parental VAFs in blood samples varied between 0.08 and 9%. The distribution of VAFs in additional tissues ranged from 0.03% in hair follicles to 9% in re-drawn peripheral blood. CONCLUSIONS: Our study illustrates the importance of analyzing ES data using sensitive computational and molecular methods for low-level parental somatic mosaicism for clinically relevant variants previously diagnosed in routine clinical diagnostics as apparent de novo.


Assuntos
Exoma , Mosaicismo , Exoma/genética , Sequenciamento de Nucleotídeos em Larga Escala/métodos , Humanos , Mucosa Bucal , Pais , Sequenciamento do Exoma
2.
Clin Gastroenterol Hepatol ; 18(3): 676-683.e3, 2020 03.
Artigo em Inglês | MEDLINE | ID: mdl-31323382

RESUMO

BACKGROUND & AIMS: Precursors of pancreatic cancer arise in the ductal epithelium; markers exfoliated into pancreatic juice might be used to detect high-grade dysplasia (HGD) and cancer. Specific methylated DNA sequences in pancreatic tissue have been associated with adenocarcinoma. We analyzed these methylated DNA markers (MDMs) in pancreatic juice samples from patients with pancreatic ductal adenocarcinomas (PDACs) or intraductal papillary mucinous neoplasms (IPMNs) with HGD (cases), and assessed their ability to discriminate these patients from individuals without dysplasia or with IPMNs with low-grade dysplasia (controls). METHODS: We obtained pancreatic juice samples from 38 patients (35 with biopsy-proven PDAC or pancreatic cystic lesions with invasive cancer and 3 with HGD) and 73 controls (32 with normal pancreas and 41 with benign disease), collected endoscopically from the duodenum after secretin administration from February 2015 through November 2016 at 3 medical centers. Samples were analyzed for the presence of 14 MDMs (in the genes NDRG4, BMP3, TBX15, C13orf18, PRKCB, CLEC11A, CD1D, ELMO1, IGF2BP1, RYR2, ADCY1, FER1L4, EMX1, and LRRC4), by quantitative allele-specific real-time target and signal amplification. We performed area under the receiver operating characteristic curve analyses to determine the ability of each marker, and panels of markers, to distinguish patients with HGD and cancer from controls. MDMs were combined to form a panel for detection using recursive partition trees. RESULTS: We identified a group of 3 MDMs (at C13orf18, FER1L4, and BMP3) in pancreatic juice that distinguished cases from controls with an area under the receiver operating characteristic value of 0.90 (95% CI, 0.83-0.97). Using a specificity cut-off value of 86%, this group of MDMs distinguished patients with any stage of pancreatic cancer from controls with 83% sensitivity (95% CI, 66%-93%) and identified patients with stage I or II PDAC or IPMN with HGD with 80% sensitivity (95% CI, 56%-95%). CONCLUSIONS: We identified a group of 3 MDMs in pancreatic juice that identify patients with pancreatic cancer with an area under the receiver operating characteristic value of 0.90, including patients with early stage disease or advanced precancer. These DNA methylation patterns might be included in algorithms for early detection of pancreatic cancer, especially in high-risk cohorts. Further optimization and clinical studies are needed.


Assuntos
Carcinoma Ductal Pancreático , Neoplasias Pancreáticas , Carcinoma Ductal Pancreático/diagnóstico , DNA , Detecção Precoce de Câncer , Humanos , Suco Pancreático , Neoplasias Pancreáticas/diagnóstico
3.
Am J Gastroenterol ; 114(9): 1539-1549, 2019 09.
Artigo em Inglês | MEDLINE | ID: mdl-31306149

RESUMO

OBJECTIVES: Pancreatic cystic lesions (PCLs) may be precancerous. Those likely to harbor high-grade dysplasia (HGD) or pancreatic cancer (PC) are targets for surgical resection. Current algorithms to predict advanced neoplasia (HGD/PC) in PCLs lack diagnostic accuracy. In pancreatic tissue and cyst fluid (CF) from PCLs, we sought to identify and validate novel methylated DNA markers (MDMs) that discriminate HGD/PC from low-grade dysplasia (LGD) or no dysplasia (ND). METHODS: From an unbiased whole-methylome discovery approach using predefined selection criteria followed by multistep validation on case (HGD or PC) and control (ND or LGD) tissues, we identified discriminant MDMs. Top candidate MDMs were then assayed by quantitative methylation-specific polymerase chain reaction on archival CF from surgically resected PCLs. RESULTS: Of 25 discriminant MDMs identified in tissue, 13 were selected for validation in 134 CF samples (21 cases [8 HGD, 13 PC], 113 controls [45 ND, 68 LGD]). A tree-based algorithm using 2 CF-MDMs (TBX15, BMP3) achieved sensitivity and specificity above 90%. Discrimination was significantly better by this CF-MDM panel than by mutant KRAS or carcinoembryonic antigen, with areas under the receiver operating characteristic curve of 0.93 (95% confidence interval: 0.86-0.99), 0.71 (0.57-0.85), and 0.72 (0.60-0.84), respectively. Cutoffs for the MDM panel applied to an independent CF validation set (31 cases, 56 controls) yielded similarly high discrimination, areas under the receiver operating characteristic curve = 0.86 (95% confidence interval: 0.77-0.94, P = 0.2). DISCUSSION: Novel MDMs discovered and validated in tissue accurately identify PCLs harboring HGD/PC. A panel of 2 MDMs assayed in CF yielded results with potential to enhance current risk prediction algorithms. Prospective studies are indicated to optimize and further evaluate CF-MDMs for clinical use.


Assuntos
Carcinoma Ductal Pancreático/genética , Cistadenoma Seroso/genética , Metilação de DNA/genética , Cisto Pancreático/genética , Neoplasias Intraductais Pancreáticas/genética , Neoplasias Pancreáticas/genética , Lesões Pré-Cancerosas/genética , Idoso , Proteína Morfogenética Óssea 3/genética , Antígeno Carcinoembrionário/metabolismo , Carcinoma Ductal Pancreático/diagnóstico , Carcinoma Ductal Pancreático/patologia , Líquido Cístico/metabolismo , Cistadenoma Seroso/diagnóstico , Cistadenoma Seroso/patologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Gradação de Tumores , Cisto Pancreático/diagnóstico , Cisto Pancreático/patologia , Neoplasias Intraductais Pancreáticas/diagnóstico , Neoplasias Intraductais Pancreáticas/patologia , Neoplasias Pancreáticas/diagnóstico , Neoplasias Pancreáticas/patologia , Reação em Cadeia da Polimerase , Lesões Pré-Cancerosas/diagnóstico , Lesões Pré-Cancerosas/patologia , Proteínas Proto-Oncogênicas p21(ras)/genética , Reprodutibilidade dos Testes , Sensibilidade e Especificidade , Proteínas com Domínio T/genética
4.
BMC Genomics ; 19(1): 401, 2018 May 25.
Artigo em Inglês | MEDLINE | ID: mdl-29801434

RESUMO

BACKGROUND: MicroRNA (miRNA) profiling is an important step in studying biological associations and identifying marker candidates. miRNA exists in isoforms, called isomiRs, which may exhibit distinct properties. With conventional profiling methods, limitations in assay and analysis platforms may compromise isomiR interrogation. RESULTS: We introduce a comprehensive approach to sequence-oriented isomiR annotation (CASMIR) to allow unbiased identification of global isomiRs from small RNA sequencing data. In this approach, small RNA reads are maintained as independent sequences instead of being summarized under miRNA names. IsomiR features are identified through step-wise local alignment against canonical forms and precursor sequences. Through customizing the reference database, CASMIR is applicable to isomiR annotation across species. To demonstrate its application, we investigated isomiR profiles in normal and neoplastic human colorectal epithelia. We also ran miRDeep2, a popular miRNA analysis algorithm to validate isomiRs annotated by CASMIR. With CASMIR, specific and biologically relevant isomiR patterns could be identified. We note that specific isomiRs are often more abundant than their canonical forms. We identify isomiRs that are commonly up-regulated in both colorectal cancer and advanced adenoma, and illustrate advantages in targeting isomiRs as potential biomarkers over canonical forms. CONCLUSIONS: Studying miRNAs at the isomiR level could reveal new insight into miRNA biology and inform assay design for specific isomiRs. CASMIR facilitates comprehensive annotation of isomiR features in small RNA sequencing data for isomiR profiling and differential expression analysis.


Assuntos
Neoplasias Colorretais/genética , Perfilação da Expressão Gênica , MicroRNAs/genética , Anotação de Sequência Molecular/métodos , Isoformas de RNA/genética , Análise de Sequência de RNA , Colo/metabolismo , Feminino , Humanos , Mucosa Intestinal/metabolismo , Masculino , Pessoa de Meia-Idade
5.
Dig Dis Sci ; 62(8): 1985-1994, 2017 08.
Artigo em Inglês | MEDLINE | ID: mdl-28660489

RESUMO

BACKGROUND: Fecal occult blood testing (FOBT) has historically relied on methods to detect hemoglobin with no fundamental innovations in decades. AIM: To examine microRNA (miRNA) as a new marker class for FOBT. METHODS: Candidate miRNA markers were identified by small RNA sequencing of human whole blood compared to colorectal epithelia. Markers were tested in human blood cell subsets and blood from non-human species. We assessed assay linearity in blood spiking and marker stability in stool over incubation experiments. Levels of candidate erythrocyte markers were explored in stools from colorectal cancer (CRC) cases and controls. RESULTS: Based on small RNA sequencing and validation RT-qPCR, expression level of each of the top blood-enriched markers (hsa-miR-144-3p, 144-5p, 451a, 486-5p, 363-3p, 20b-5p) could perfectly discriminate blood from colorectal epithelia. All six markers arose from and showed specificity to human erythrocytes. Marker levels increased linearly with erythrocyte concentration in saline or stool and demonstrated a broader dynamic range than did immunochemical test for hemoglobin. Degradation of markers occurred in stool but was reduced with preservative buffers. Erythrocyte marker candidates for stool testing were selected in an exploratory set of stools (20 CRC, 40 normal). Candidates were then further tested in a feasibility set (29 CRC, 31 advanced adenoma, and 115 normal); a miRNA panel (hsa-miR-451a, 144-5p, and 200b-3p as normalizer) yielded an AUC of 0.89 (95% CI 0.82-0.95, P < .0001) for CRC. CONCLUSIONS: A novel miRNA-based approach accurately quantifies fecal blood levels over a broad, clinically relevant range.


Assuntos
Neoplasias Colorretais/diagnóstico , Eritrócitos/química , Fezes/química , MicroRNAs/sangue , Sangue Oculto , Biomarcadores Tumorais/sangue , Biomarcadores Tumorais/genética , Estudos de Casos e Controles , Neoplasias Colorretais/genética , Estudos de Viabilidade , Humanos , Mucosa Intestinal/química , Estudos Prospectivos , Reação em Cadeia da Polimerase em Tempo Real , Sensibilidade e Especificidade , Análise de Sequência de RNA
7.
Mol Cancer ; 13: 124, 2014 May 26.
Artigo em Inglês | MEDLINE | ID: mdl-24885920

RESUMO

BACKGROUND: miR-139-5p was identified to be significantly down-regulated in colon tumor tissues by miRNA array. We aimed to clarify its biological function, molecular mechanisms and direct target gene in colorectal cancer (CRC). METHODS: The biological function of miR-139-5p was examined by cell growth, cell cycle and apoptosis analysis in vitro and in vivo. miR-139-5p target gene and signaling pathway was identified by luciferase activity assay and western blot. RESULTS: miR-139-5p was significantly down-regulated in primary tumor tissues (P < 0.0001). Ectopic expression of miR-139-5p in colon cancer cell lines significantly suppressed cell growth as evidenced by cell viability assay (P < 0.001) and colony formation assay (P < 0.01) and in xenograft tumor growth in nude mice (P < 0.01). miR-139-5p induced apoptosis (P < 0.01), concomitantly with up-regulation of key apoptosis genes including cleaved caspase-8, caspase-3, caspase-7 and PARP. miR-139-5p also caused cell cycle arrest in G0/G1 phase (P < 0.01), with upregulation of key G0/G1 phase regulators p21Cip1/Waf1 and p27Kip1. Moreover, miR-139-5p inhibited cellular migration (P < 0.001) and invasiveness (P < 0.001) through the inhibition of matrix metalloproteinases (MMP)7 and MMP9. Oncogene NOTCH1 was revealed to be a putative target of miR-139-5p, which was inversely correlated with miR-139-5p expression (r = -0.3862, P = 0.0002). CONCLUSIONS: miR-139-5p plays a pivotal role in colon cancer through inhibiting cell proliferation, metastasis, and promoting apoptosis and cell cycle arrest by targeting oncogenic NOTCH1.


Assuntos
Neoplasias Colorretais/genética , MicroRNAs/genética , Receptor Notch1/biossíntese , Animais , Apoptose/genética , Pontos de Checagem do Ciclo Celular/genética , Linhagem Celular Tumoral , Proliferação de Células , Neoplasias Colorretais/patologia , Regulação Neoplásica da Expressão Gênica , Técnicas de Silenciamento de Genes , Genes Supressores de Tumor , Humanos , Camundongos , Receptor Notch1/genética , Ensaios Antitumorais Modelo de Xenoenxerto
8.
PLoS One ; 19(8): e0308711, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-39146279

RESUMO

Regular screening for colorectal cancer (CRC) is critical for early detection and long-term survival. Despite the current screening options available and advancements in therapies there will be around 53,000 CRC related deaths this year. There is great interest in non-invasive alternatives such as plasma cell-free RNA (cfRNA) for diagnostic, prognostic, and predictive applications. In the current study, our aim was to identify and validate potential cfRNA candidates to improve early CRC diagnosis. In phase 1 (n = 49; 25 controls, 24 cancers), discovery total RNA sequencing was performed. Select exons underwent validation in phase 2 (n = 73; 35 controls, 29 cancers, 9 adenomas) using targeted capture sequencing (n = 10,371 probes). In phase 3 (n = 57; 30 controls, 27 cancers), RT-qPCR was performed on previously identified candidates (n = 99). There were 895 exons that were differentially expressed (325 upregulated, 570 downregulated) among cancers versus controls. In phases 2 and 3, fewer markers were validated than expected in independent sets of patients, most of which were from previously published literature (FGA, FGB, GPR107, CDH3, and RP23AP7). In summary, we optimized laboratory processes and data analysis strategies which can serve as methodological framework for future plasma RNA studies beyond just the scope of CRC detection. Additionally, further exploration is needed in order to determine if the few cfRNA candidates identified in this study have clinical utility for early CRC detection. Over time, advancements in technologies, data analysis, and RNA preservation methods at time of collection may improve the biological and technical reproducibility of cfRNA biomarkers and enhance the feasibility of RNA-based liquid biopsies.


Assuntos
Biomarcadores Tumorais , Ácidos Nucleicos Livres , Neoplasias Colorretais , Humanos , Neoplasias Colorretais/genética , Neoplasias Colorretais/diagnóstico , Neoplasias Colorretais/sangue , Biomarcadores Tumorais/genética , Biomarcadores Tumorais/sangue , Ácidos Nucleicos Livres/genética , Ácidos Nucleicos Livres/sangue , Masculino , Feminino , Pessoa de Meia-Idade , Idoso , Transcriptoma , Detecção Precoce de Câncer/métodos , Regulação Neoplásica da Expressão Gênica , Análise de Sequência de RNA/métodos , Estudos de Casos e Controles
9.
Mol Med ; 18: 1491-8, 2013 Feb 08.
Artigo em Inglês | MEDLINE | ID: mdl-23255074

RESUMO

Deregulated miRNAs participate in colorectal carcinogenesis. In this study, miR-218 was found to be downregulated in human colorectal cancer (CRC) by miRNA profile assay. miR-218 was silenced or downregulated in all five colon cancer cells (Caco2, HT29, SW620, HCT116 and LoVo) relative to normal colon tissues. miR-218 expression was significantly lower in 46 CRC tumor tissues compared with their adjacent normal tissues (P < 0.001). Potential target genes of miR-218 were predicted and BMI1 polycomb ring finger oncogene (BMI-1), a polycomb ring finger oncogene, was identified as one of the potential targets. Upregulation of BMI-1 was detected in CRC tumors compared with adjacent normal tissues (P < 0.001) and in all five colon cancer cell lines. Transfection of miR-218 in colon cancer cell lines (HCT116, HT29) significantly reduced luciferase activity of the wild-type construct of BMI-1 3' untranslated region (3'UTR) (P < 0.001), whereas this effect was not seen in the construct with mutant BMI-1 3'UTR, indicating a direct and specific interaction of miR-218 with BMI-1. Ectopic expression of miR-218 in HCT116 and HT29 cells suppressed BMI-1 mRNA and protein expression. In addition, miR-218 suppressed protein expression of BMI-1 downstream targets of cyclin-dependent kinase 4, a cell cycle regulator, while upregulating protein expression of p53. We further revealed that miR-218 induced apoptosis (P < 0.01), inhibited cell proliferation (P < 0.05) and promoted cell cycle arrest in the G2 phase (P < 0.01). In conclusion, miR-218 plays a pivotal role in CRC development through inhibiting cell proliferation and cycle progression and promoting apoptosis by downregulating BMI-1.


Assuntos
Apoptose/genética , Ciclo Celular/genética , Neoplasias do Colo/genética , Neoplasias do Colo/patologia , Regulação para Baixo/genética , MicroRNAs/metabolismo , Complexo Repressor Polycomb 1/genética , Regiões 3' não Traduzidas/genética , Sequência de Bases , Pontos de Checagem do Ciclo Celular/genética , Linhagem Celular Tumoral , Proliferação de Células , Neoplasias Colorretais/genética , Neoplasias Colorretais/patologia , Regulação Neoplásica da Expressão Gênica , Humanos , MicroRNAs/genética , Dados de Sequência Molecular , Análise de Sequência com Séries de Oligonucleotídeos , Complexo Repressor Polycomb 1/metabolismo , Ligação Proteica/genética , Reprodutibilidade dos Testes , Transfecção , Proteína Supressora de Tumor p53/metabolismo , Regulação para Cima/genética
10.
Gut ; 61(5): 739-45, 2012 May.
Artigo em Inglês | MEDLINE | ID: mdl-21930727

RESUMO

OBJECTIVE: The detection of molecular markers in stool samples is a potential strategy for colorectal cancer (CRC) screening. This study evaluated the feasibility of detecting miR-21 and miR-92a in stool samples of patients with CRC or polyps. METHODS: The reproducibility of detection and stability of stool-based microRNA were evaluated. Stool samples were collected from 88 patients with CRC, 57 patients with colorectal polyps and 101 healthy controls. MiRNA levels in CRC tissues and stool samples were detected by real-time quantitative reverse transcription PCR. Stool miR-21 and miR-92a levels were compared before and after the removal of tumour or advanced adenoma. RESULTS: The study demonstrated that stool-based miRNA were stable with highly reproducible detection. The expression of miR-21 and miR-92a was significantly higher in CRC tissues compared with their adjacent normal tissues (p<0.0001). Patients with CRC had a significantly higher stool miR-21 level (p<0.01) and miR-92a level (p<0.0001) compared with normal controls. Stool miR-92a, but not miR-21, was significantly higher in patients with polyps than in controls (p<0.0001). At a cut-off value of 435 copies/ng of stool RNA, miR-92a had a sensitivity of 71.6% and 56.1% for CRC and polyp, respectively, and a specificity of 73.3%. In addition, the stool miR-92a level demonstrated a higher sensitivity for distal CRC than proximal CRC (p<0.05), and a higher sensitivity for advanced adenoma than minor polyps (p<0.05). Removal of tumour resulted in reduced stool miR-21 and miR-92a levels (p<0.01), and the removal of advanced adenoma resulted in a reduction of the stool miR-92a level (p<0.05). CONCLUSION: Stool miRNA are useful for screening CRC and polyps.


Assuntos
Adenocarcinoma/diagnóstico , Neoplasias Colorretais/diagnóstico , Pólipos Intestinais/diagnóstico , MicroRNAs/metabolismo , Adenocarcinoma/metabolismo , Adenocarcinoma/cirurgia , Idoso , Biomarcadores/metabolismo , Neoplasias Colorretais/metabolismo , Neoplasias Colorretais/cirurgia , Estudos de Viabilidade , Fezes/química , Feminino , Humanos , Pólipos Intestinais/metabolismo , Pólipos Intestinais/cirurgia , Masculino , Pessoa de Meia-Idade , Reação em Cadeia da Polimerase em Tempo Real , Reprodutibilidade dos Testes , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Sensibilidade e Especificidade
11.
J Gastroenterol Hepatol ; 27(11): 1665-9, 2012 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-22742931

RESUMO

Hepatocellular carcinoma (HCC) is the fifth most common cancer worldwide. Major risk factors of HCC include infection with hepatitis B or C viruses, alcohol and non-alcoholic fatty liver disease. HCC is difficult to diagnose at early stage, and has a very poor survival rate when diagnosed at a late stage. The majority of HCC-related deaths result from local invasion (to cause liver failure) or distant metastases. There is an urgent need to identify effective molecular targets for the treatment of the disease. As the target of an established class of therapeutic agent thiazolidinediones (TZDs), peroxisome-proliferator-activated receptor γ (PPARγ) has been widely studied for its role in the development of HCC. A substantial body of evidence based on in vitro and in vivo models indicates that the activation of PPARγ is able to inhibit HCC cell proliferation and tumor growth through inducing cell cycle arrest and apoptosis via the regulation of a panel of downstream effector molecules. PPARγ activation also induces an inhibitory effect on HCC metastasis. Meanwhile, there is new evidence suggesting that PPARγ inhibition could also be anti-tumorigenic. In the present review, we summarize the available information on the role of PPARγ in HCC development and spread, and discuss whether PPARγ activation by TZDs could play a role in the treatment of HCC, summarizing both in vitro and in vivo. Considering the available data, PPARγ seems to exert beneficial effects against HCC and may therefore represent as a therapeutic target.


Assuntos
Carcinoma Hepatocelular/metabolismo , Neoplasias Hepáticas/metabolismo , PPAR gama/metabolismo , Tiazolidinedionas/uso terapêutico , Apoptose/efeitos dos fármacos , Carcinoma Hepatocelular/tratamento farmacológico , Pontos de Checagem do Ciclo Celular/efeitos dos fármacos , Humanos , Neoplasias Hepáticas/tratamento farmacológico , PPAR gama/agonistas , Tiazolidinedionas/farmacologia
12.
Hepatology ; 51(6): 2008-19, 2010 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-20512989

RESUMO

UNLABELLED: Although peroxisome proliferator-activated receptor gamma (PPARgamma) agonist have been shown to inhibit hepatocellular carcinoma (HCC) development, the role of PPARgamma in hepatocarcinogenesis remains unclear. We investigated the therapeutic efficacy of PPARgamma against HCC. PPARgamma-deficient (PPARgamma(+/-)) and wild-type (PPARgamma(+/+)) littermates were used in a diethylnitrosamine (DEN)-induced HCC model and treated with PPARgamma agonist (rosiglitazone) or the vehicle alone for 8 months. The effects of PPARgamma on HCC cell growth and apoptosis were examined using PPARgamma-expressing adenovirus (Ad-PPARgamma). PPARgamma(+/-) mice were more susceptible to DEN-induced HCC than PPARgamma(+/+) mice (94% versus 62%, P < 0.05), and rosiglitazone significantly reduced the incidence of HCC in PPARgamma(+/+) mice (vehicle 62% versus treatment 24%, P < 0.01), but not in PPARgamma(+/-) mice, indicating that PPARgamma suppresses hepatocellular carcinogenesis. A pronounced expression of PPARgamma was observed in a HCC cell line (Hep3B) infected with Ad-PPARgamma. Such induction markedly suppressed HCC cell viability (P < 0.01). Further, Hep3B infection with Ad-PPARgamma revealed a decreased proportion of cells in S-phase (12.92% versus 11.58%, P < 0.05), with arrest at G(2)/M phase (38.2% versus 55.68%, P < 0.001), and there was concomitant phosphorylation of the key G(2)/M phase inhibitors cdc25C and cdc2. PPARgamma overexpression increased cell apoptosis (21.47% versus 35.02%, P < 0.01), mediated by both extrinsic (Fas and tumor necrosis factor-alpha) and intrinsic (caspase-9, caspase-3, caspase-7, and poly[ADP-ribose] polymerase) pathways. Moreover, PPARgamma directly induced a putative tumor suppressor gene, growth differentiation factor-15. CONCLUSION: Loss of one PPARgamma allele is sufficient to enhance susceptibility to HCC. PPARgamma suppresses tumor cell growth through reducing cell proliferation and inducing G(2)/M phase arrest, apoptosis, and up-regulating growth differentiation factor-15. Thus, PPARgamma acts as a tumor-suppressor gene in the liver.


Assuntos
Carcinoma Hepatocelular/prevenção & controle , Hipoglicemiantes/uso terapêutico , Neoplasias Hepáticas Experimentais/prevenção & controle , PPAR gama/metabolismo , Tiazolidinedionas/uso terapêutico , Adenoviridae , Alquilantes , Animais , Apoptose , Carcinoma Hepatocelular/genética , Carcinoma Hepatocelular/metabolismo , Ciclo Celular , Linhagem Celular Tumoral , Proliferação de Células , Dietilnitrosamina , Perfilação da Expressão Gênica , Fator 15 de Diferenciação de Crescimento/metabolismo , Humanos , Neoplasias Hepáticas Experimentais/genética , Neoplasias Hepáticas Experimentais/metabolismo , Masculino , Camundongos , Camundongos Knockout , Análise de Sequência com Séries de Oligonucleotídeos , PPAR gama/agonistas , PPAR gama/genética , Rosiglitazona , Regulação para Cima
13.
Clin Cancer Res ; 27(9): 2523-2532, 2021 05 01.
Artigo em Inglês | MEDLINE | ID: mdl-33593879

RESUMO

PURPOSE: We have previously identified tissue methylated DNA markers (MDMs) associated with pancreatic ductal adenocarcinoma (PDAC). In this case-control study, we aimed to assess the diagnostic performance of plasma MDMs for PDAC. EXPERIMENTAL DESIGN: Thirteen MDMs (GRIN2D, CD1D, ZNF781, FER1L4, RYR2, CLEC11A, AK055957, LRRC4, GH05J042948, HOXA1, PRKCB, SHISA9, and NTRK3) were identified on the basis of selection criteria applied to results of prior tissue experiments and assays were optimized in plasma. Next, 340 plasma samples (170 PDAC cases and 170 controls) were assayed using target enrichment long-probe quantitative amplified signal method. Initially, 120 advanced-stage PDAC cases and 120 healthy controls were used to train a prediction algorithm at 97.5% specificity using random forest modeling. Subsequently, the locked algorithm derived from the training set was applied to an independent blinded test set of 50 early-stage PDAC cases and 50 controls. Finally, data from all 340 patients were combined, and cross-validated. RESULTS: The cross-validated area under the receiver operating characteristic curve (AUC) for the training set was 0.93 (0.89-0.96) for the MDM panel alone, 0.91 (95% confidence interval, 0.87-0.96) for carbohydrate antigen 19-9 (CA19-9) alone, and 0.99 (0.98-1) for the combined MDM-CA19-9 panel. In the test set of early-stage PDAC, the AUC for MDMs alone was 0.84 (0.76-0.92), CA19-9 alone was 0.87 (0.79-0.94), and combined MDM-CA19-9 panel was 0.90 (0.84-0.97) significantly better compared with either MDMs alone or CA19-9 alone (P = 0.0382 and 0.0490, respectively). At a preset specificity of 97.5%, the sensitivity for the combined panel in the test set was 80% (28%-99%) for stage I disease and 82% (68%-92%) for stage II disease. Using the combined datasets, the cross-validated AUC was 0.9 (0.86-0.94) for the MDM panel alone and 0.89 for CA19-9 alone (0.84-0.93) versus 0.97 (0.94-0.99) for the combined MDM-CA19-9 panel (P ≤ 0.0001). Overall, cross-validated sensitivity of MDM-CA19-9 panel was 92% (83%-98%), with an observed specificity of 92% at the preset specificity of 97.5%. CONCLUSIONS: Plasma MDMs in combination with CA19-9 detect PDAC with significantly higher accuracy compared with either biomarker individually.


Assuntos
Biomarcadores Tumorais , Antígeno CA-19-9/sangue , Metilação de DNA , Neoplasias Pancreáticas/diagnóstico , Neoplasias Pancreáticas/etiologia , Estudos de Casos e Controles , Comorbidade , Biologia Computacional/métodos , Feminino , Humanos , Masculino , Estadiamento de Neoplasias , Neoplasias Pancreáticas/sangue , Curva ROC
15.
Oncotarget ; 7(2): 1559-68, 2016 Jan 12.
Artigo em Inglês | MEDLINE | ID: mdl-26621842

RESUMO

OBJECTIVE: Detection of microRNA (miRNA) aberrations in human faeces is a new approach for colorectal cancer (CRC) screening. The aim of this study was to characterise miR-20a in faeces as a non-invasive biomarker for diagnosis of CRC. RESULTS: miR-20a expression was significantly higher in the 40 CRC tumours compared to their respective adjacent normal tissues (P = 0.0065). Levels of miR-20a were also significantly higher in faecal samples from CRC patients (P < 0.0001). The area under receiver operating characteristic (AUROC) curve for miR-20a was 0.73, with a sensitivity of 55% and specificity of 82% for CRC patients compared with controls. No significant difference in the level of miR-20a was found between patients with proximal, distal, and rectal cancer. The use of antibiotics did not influence faecal miR-20a levels. PATIENTS AND METHODS: miR-20a was selected from an expression microarray containing 667 miRNAs. Further verification of miR-20a was performed in 40 pairs of primary CRC tissues, as well as 595 faecal samples (198 CRCs, 199 adenomas, and 198 healthy controls) using TaqMan probe based quantitative Real-Time PCR (qRT-PCR). CONCLUSIONS: Faecal-based miR-20a can be utilised as a potential non-invasive biomarker for CRC screening.


Assuntos
Adenoma/genética , Biomarcadores Tumorais/genética , Carcinoma/genética , Neoplasias Colorretais/genética , Fezes/química , MicroRNAs/genética , Adenoma/diagnóstico , Idoso , Área Sob a Curva , Carcinoma/diagnóstico , Estudos de Casos e Controles , Neoplasias Colorretais/diagnóstico , Feminino , Perfilação da Expressão Gênica/métodos , Humanos , Masculino , Pessoa de Meia-Idade , Técnicas de Diagnóstico Molecular , Análise de Sequência com Séries de Oligonucleotídeos , Valor Preditivo dos Testes , Curva ROC , Reação em Cadeia da Polimerase em Tempo Real , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Regulação para Cima
16.
Clin Cancer Res ; 20(11): 2994-3002, 2014 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-24691020

RESUMO

PURPOSE: Detecting microRNA (miRNA) in stool is a novel approach for colorectal cancer (CRC) screening. This study aimed to identify stool-based miRNA as noninvasive biomarkers for detection of CRC and adenoma. EXPERIMENTAL DESIGN: A miRNA expression array covering 667 human miRNAs was performed on five pairs of CRC and two pairs of advanced adenoma tissues. The most upregulated miRNAs were validated in 40 pairs of CRC tissues, 16 pairs of advanced adenoma tissues, and 424 stool samples, including 104 CRCs, 169 adenomas, 42 inflammatory bowel diseases (IBD), and 109 healthy controls. miRNA levels were followed-up after removal of lesions. RESULTS: In an array analysis, miR-31 and miR-135b were the most upregulated miRNAs in CRC and advanced adenoma as compared with their adjacent normal tissues (>13-fold increase). In stool samples, level of miR-135b was significantly higher in subjects with CRC (P < 0.0001) or adenomas (P < 0.0001), but not in patients with IBD compared with controls. miR-135b showed a significant increasing trend across the adenoma to cancer sequence (P < 0.0001). Levels of miR-31 were not significantly different among groups. The sensitivity of stool mR-135b was 78% for CRC, 73% for advanced adenoma, and 65% for any adenoma, respectively, with a specificity of 68%. No significant difference in the miR-135b level was found between proximal and distal colorectal lesions. Stool miR-135b dropped significantly upon removal of CRC or advanced adenoma (P < 0.0001). CONCLUSION: Stool-based miR-135b can be used as a noninvasive biomarker for the detection of CRC and advanced adenoma. Clin Cancer Res; 20(11); 2994-3002. ©2014 AACR.


Assuntos
Adenocarcinoma/diagnóstico , Adenoma/diagnóstico , Biomarcadores Tumorais/análise , Neoplasias Colorretais/diagnóstico , Detecção Precoce de Câncer/métodos , MicroRNAs/análise , Adenocarcinoma/genética , Adenoma/genética , Idoso , Estudos de Casos e Controles , Neoplasias Colorretais/genética , Fezes/química , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Análise de Sequência com Séries de Oligonucleotídeos , Reação em Cadeia da Polimerase em Tempo Real , Sensibilidade e Especificidade
17.
Chin Clin Oncol ; 2(1): 8, 2013 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-25841449

RESUMO

Colorectal cancer (CRC) is the third commonest cancer worldwide. As many CRC patients were identified at advanced stages, screening asymptomatic individuals has substantial clinical benefit. Most CRC arises through recognizable early stage. With the improved understanding of the biology of CRC and precancerous lesion, testing molecular aberrations in stool and blood promises novel screening approaches that are noninvasive, sensitive, and more affordable compared with traditional structural examinations.

18.
PLoS One ; 8(2): e57036, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23437304

RESUMO

BACKGROUND: miR-18a is one of the most up-regulated miRNAs in colorectal cancers (CRC) based on miRNA profiling. In this study, we examined the functional significance of miR-18a in CRC. METHODS: Expression of miR-18a was investigated in 45 CRC patients. Potential target genes of miR-18a were predicted by in silico search and confirmed by luciferase activity assay and Western blot. DNA damage was measured by comet assay. Gene function was measured by cell viability, colony formation and apoptosis assays. RESULTS: The up-regulation of miR-18a was validated and confirmed in 45 primary CRC tumors compared with adjacent normal tissues (p<0.0001). Through in silico search, the 3'UTR of Ataxia telangiectasia mutated (ATM) contains a conserved miR-18a binding site. Expression of ATM was down-regulated in CRC tumors (p<0.0001) and inversely correlated with miR-18a expression (r = -0.4562, p<0.01). Over-expression of miR-18a in colon cancer cells significantly reduced the luciferase activity of the construct with wild-type ATM 3'UTR but not that with mutant ATM 3'UTR, inferring a direct interaction of miR-18a with ATM 3'UTR. This was further confirmed by the down-regulation of ATM protein by miR-18a. As ATM is a key enzyme in DNA damage repair, we evaluated the effect of miR-18a on DNA double-strand breaks. Ectopic expression of miR-18a significantly inhibited the repair of DNA damage induced by etoposide (p<0.001), leading to accumulation of DNA damage, increase in cell apoptosis and poor clonogenic survival. CONCLUSION: miR-18a attenuates cellular repair of DNA double-strand breaks by directly suppressing ATM, a key enzyme in DNA damage repair.


Assuntos
Proteínas de Ciclo Celular/genética , Neoplasias Colorretais/genética , Dano ao DNA , Proteínas de Ligação a DNA/genética , Regulação Neoplásica da Expressão Gênica , MicroRNAs/genética , Proteínas Serina-Treonina Quinases/genética , Proteínas Supressoras de Tumor/genética , Regiões 3' não Traduzidas , Idoso , Idoso de 80 Anos ou mais , Apoptose/efeitos dos fármacos , Apoptose/genética , Proteínas Mutadas de Ataxia Telangiectasia , Pareamento de Bases , Sequência de Bases , Linhagem Celular Tumoral , Neoplasias Colorretais/mortalidade , Neoplasias Colorretais/patologia , Quebras de DNA de Cadeia Dupla , Dano ao DNA/efeitos dos fármacos , Etoposídeo/farmacologia , Etoposídeo/toxicidade , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Interferência de RNA
19.
Mol Cancer Res ; 11(9): 1051-60, 2013 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-23723074

RESUMO

UNLABELLED: Dysregulated microRNA (miRNA) expression was profiled through a miRNA array comparison between human colorectal cancer tumors and their adjacent normal tissues. Specifically, using laser capture micro-dissection, miR-133a was shown to be significantly downregulated in primary colorectal cancer specimens compared with matched adjacent normal tissue. Ectopic expression of miR-133a significantly suppressed colorectal cancer cell growth in vitro and in vivo. Cell-cycle analysis revealed that miR-133a induced a G0/G1-phase arrest, concomitant with the upregulation of the key G1-phase regulator p21(Cip1). We further revealed that miR-133a markedly increased p53 protein and induced p21(Cip1) transcription. Studies in silico revealed that the 3'UTR of the ring finger and FYVE-like domain containing E3-ubiquitin protein ligase (RFFL), which regulates p53 protein, contains an evolutionarily conserved miR-133a binding site. miR-133a repressed RFFL-3'UTR reporter activity and reduced RFFL protein levels, indicating that miR-133a directly bound to RFFL mRNA and inhibited RFFL translation. Moreover, miR-133a sensitized colon cancer cells to doxorubicin and oxaliplatin by enhancing apoptosis and inhibiting cell proliferation. These data add weight to the significance of miR-133a in the development of CRC. IMPLICATIONS: miR-133a serves as a potential tumor suppressor upstream of p53 in colorectal cancer and may sensitize cells to therapeutics.


Assuntos
Neoplasias Colorretais/genética , MicroRNAs/genética , MicroRNAs/metabolismo , Proteína Supressora de Tumor p53/metabolismo , Animais , Antineoplásicos/farmacologia , Apoptose/genética , Carcinogênese/genética , Carcinogênese/metabolismo , Pontos de Checagem do Ciclo Celular , Linhagem Celular Tumoral , Sobrevivência Celular , Neoplasias Colorretais/tratamento farmacológico , Neoplasias Colorretais/metabolismo , Neoplasias Colorretais/patologia , Inibidor de Quinase Dependente de Ciclina p21/genética , Inibidor de Quinase Dependente de Ciclina p21/metabolismo , Modelos Animais de Doenças , Doxorrubicina/farmacologia , Feminino , Perfilação da Expressão Gênica , Regulação Neoplásica da Expressão Gênica , Genes Supressores de Tumor , Humanos , Camundongos , Camundongos Nus , Transplante de Neoplasias , Compostos Organoplatínicos/farmacologia , Oxaliplatina , Proteína Supressora de Tumor p53/genética
20.
Int J Biochem Cell Biol ; 42(6): 948-57, 2010 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-20156580

RESUMO

Nonalcoholic steatohepatitis with fibrosis is a more severe form of nonalcoholic fatty liver disease, one of the most common liver diseases. We have previously shown that peroxisome proliferator-activated receptors gamma (PPARgamma) ligand, rosiglitazone, prevented the development of the methionine choline deficient (MCD) diet-induced fibrosing steatohepatitis. We have now tested whether overexpression of PPARgamma ameliorates established steatohepatitis and fibrosis. Male C57BL6 mice fed with MCD diet for 8 weeks developed hepatic fibrosis with increased hepatic expression of collagen1alpha(I), inhibitors of fibrosis reversal-1, regulator involved in matrix degradation-9 and connective tissue growth factor. After 2 weeks of transduction of PPARgamma through an adenovirus-expressing PPARgamma (Ad-PPARgamma), expression of these genes was reduced in a manner that paralleled the reduction in activated hepatic stellate cells (HSCs) and resolution of liver fibrosis. On the in vitro study, PPARgamma is expressed in primary quiescent HSC, but depleted in culture activated HSC. Conversely, ectopic expression of PPARgamma in activated HSC achieved the phenotypic reversal to the quiescent cell. Such induction markedly suppressed cell viability and cell proliferation, downregulated proliferating cell nuclear antigen, and caused cell cycle arrest at G0/G1 phase. Further, introduction of PPARgamma in HSC increased cell apoptosis, this was confirmed by enhanced expression of FasL, cleaved caspase-3, cleaved caspase-7 and poly ADP-ribose polymerase, indicating an extrinsic apoptosis pathway. In conclusion, the present study shows that MCD diet-induced fibrosing steatohepatitis can be reversed by overexpression of PPARgamma. It is likely that PPARgamma reverses fibrosis by reducing HSCs proliferation, inducing cell cycle arrest and apoptosis.


Assuntos
Deficiências Nutricionais/terapia , Fígado Gorduroso/terapia , Terapia Genética , Células Estreladas do Fígado/metabolismo , PPAR gama/metabolismo , Adenoviridae , Animais , Apoptose/genética , Proliferação de Células , Clonagem Molecular , Fator de Crescimento do Tecido Conjuntivo/genética , Fator de Crescimento do Tecido Conjuntivo/metabolismo , Deficiências Nutricionais/genética , Deficiências Nutricionais/metabolismo , Deficiências Nutricionais/patologia , Modelos Animais de Doenças , Fígado Gorduroso/genética , Fígado Gorduroso/metabolismo , Fígado Gorduroso/patologia , Vetores Genéticos , Células Estreladas do Fígado/patologia , Cirrose Hepática , Masculino , Camundongos , Camundongos Endogâmicos C57BL , PPAR gama/genética
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