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1.
Cancer Diagn Progn ; 4(5): 586-591, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-39238614

RESUMO

Background/Aim: Concerning primary central nervous system neoplasms, meningiomas demonstrate the most common type in adults worldwide. Deregulation of apoptotic pathways in malignancies, including meningiomas, is correlated with chemoresistance and poor prognosis. Caspases represent crucial proteins that induce cell apoptosis. This study aimed to correlate caspase 3 protein expression levels to meningioma clinic-pathological features. Materials and Methods: A set of fifty (n=50) meningioma lesions was included in the current analysis including a broad spectrum of histopathological subtypes (meningotheliomatous, psammomatus, transitional, fibrous, angiomatous, microcystic, atypical and anaplastic). Immunohistochemistry was implemented on tissue microarray cores of selected paraffin blocks by applying an anti-caspase 3 antibody. Additionally, an image analysis protocol was also performed in the corresponding immunostained slides. Results: Caspase 3 protein over-expression was detected in 17/50 (34%) cases, whereas the remaining 33 cases (66%) were characterized by medium to low levels of the molecule. Caspase 3 expression was statistically significantly associated with the grade of the analyzed tumors and the mitotic index (p=0.002, p=0.001, respectively). Caspase 3 expression status was also correlated with the histotype of the selected meningiomas (p=0.016). Conclusion: Caspase 3 demonstrated low expression levels in a significant subset of the examined meningiomas correlated with differentiation grade, mitotic activity, and partially with specific histotypes. Agents that could enhance caspase 3 expression - inducing its apoptotic activity - represent a very promising area in oncology for developing novel treatment regimens.

2.
Maedica (Bucur) ; 19(2): 355-359, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-39188831

RESUMO

INTRODUCTION: Onset and progression of malignant tumors is a multistep process including a variety of gross chromosomal and specific genes' deregulation. Among oncogenes that are frequently altered in solid and also in hematological malignancies, the C-myc (gene locus: 8q24.21) plays a pivotal role. C-myc is a proto-oncogene encoding for a nuclear phosphoprotein implicated in cell cycle progression, apoptosis and cellular differentiation and transformation. OBJECTIVE: The purpose of the current molecular review was to explore the differences of C-myc oncogenic activity in solid and lymphoid malignancies that modify its clinical impact on them. MATERIAL AND METHOD: A systematic review of the literature in the international database PubMed was carried out. The year 2010 was set as a prominent time limit for the publication date of articles in the majority of them, whereas specific references of great importance and historical value in the field of C-myc gene discovery and analysis were also included. The following keywords were used: C-myc, oncogene, signaling pathway, malignancies, carcinoma, lymphoma. A pool of 43 important articles were selected for the present study at the basis of combining molecular knowledge with new targeted therapeutic strategies. RESULTS: C-myc oncogene demonstrates two different mechanisms of deregulation: amplification, mutation and translocation patterns. These particular aspects of gene alteration are unique for solid and non-solid (hematological) malignancies, respectively. CONCLUSIONS: C-myc is characterized by diversity regarding its deregulation mechanisms in malignancies derived from different tissues. C-myc translocation is sporadically combined with amplification ("complicon" formation) or mutations creating exotic genetic signatures. This "bi-phasic" C-myc deregulation model in the corresponding malignant tumor categories clinically affects the corresponding patients, also modifying the targeted therapeutic strategies on them.

3.
Cancer Diagn Progn ; 4(1): 25-29, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38173659

RESUMO

Among the tumour suppressor genes that affect critically cell functions and homeostasis, phosphatase and tensin homolog deleted in chromosome 10 (PTEN- gene locus: 10q21) regulates the PI3K/Akt/mTOR signalling pathway. PTEN is deleted, mutated or epigenetically hyper-methylated in a variety of human solid malignancies. Salivary gland carcinomas (SGCs) belong to the head and neck carcinomas (HNCs) super category of solid malignancies. Histo-pathologically, they demonstrate a significant diversity due to a variety of distinct and mixed subtypes. Genetically, they are characterized by a broad spectrum of gene and chromosomal imbalances. Referring specifically to suppressor genes, PTEN deregulation plays a critical role in signaling transduction in the corresponding SGC pre- and malignant epithelia modifying the response rates to potential targeted therapeutic strategies. In the current review, we explored the role of PTEN deregulation mechanisms that are involved in the onset and progression of SGCs.

4.
Cancer Diagn Progn ; 3(2): 169-174, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-36875308

RESUMO

DNA mismatch repair system (MMR) is considered a leading genetic mechanism in stabilizing DNA structure and maintaining its function. DNA MMR is a highly conserved system in bacteria, prokaryotic, and eukaryotic cells, and provides the highest protection to DNA by repairing micro-structural alterations. DNA MMR proteins are involved in the detection and repair of intra-nucleotide base-to-base errors inside the complementary DNA strand recognizing the recently synthesized strand from the parental template. During DNA replication, a spectrum of errors including base insertion, deletion, and miss-incorporation negatively affect the molecule's structure and its functional stability. A broad spectrum of genomic alterations such as promoter hyper methylation, mutation, and loss of heterozygosity (LOH) in MMR genes including predominantly hMLH1, hMSH2, hMSH3, hMSH6, hPMS1, and hPMS2 lead to their loss of base-to-base error repairing procedure. Microsatellite instability (MSI) refers to the DNA MMR gene alterations that are observed in a variety of malignancies of different histological origins. In the current review, we present the role of DNA MMR deficiency in breast adenocarcinoma, a leading cancer-based cause of death in females worldwide.

5.
Cancer Diagn Progn ; 2(6): 603-608, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36340455

RESUMO

Breast adenocarcinoma is a leading cause of death in females worldwide. A broad spectrum of genetic and epigenetic alterations has been already identified and reported in millions of examined cancerous substrates, evidence of a high-level genomic heterogeneity that characterizes these malignancies. Concerning epigenetic changes and imbalances that critically affect progression and prognosis in the corresponding patients, DNA methylation, histone modifications (acetylation), micro-RNAs (miRs) alterations and chromatin re-organization represent the main mechanisms. Referring to DNA methylation, promoter hyper-hypo methylation in critical tumour suppressor and oncogenes is implicated in normal epithelia transformation to their neoplastic and finally malignant cyto-phenotypes. The current review is focused on the different methylation patterns and mechanisms detected in breast adenocarcinoma and their impact on the corresponding groups of patient response to specific chemotherapeutic regimens and life span prognosis.

6.
Brain Neurosci Adv ; 6: 23982128221106315, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35782711

RESUMO

Short-term synaptic plasticity represents a fundamental mechanism in neural information processing and is regulated by neuromodulators. Here, using field recordings from the CA1 region of adult rat hippocampal slices, we show that excitatory synaptic transmission is suppressed by strong but not moderate activation of adenosine A1 receptors by 2-Chloro-N6-cyclopentyladenosine (CCPA) more in the dorsal than the ventral hippocampus; in contrast, both mild and strong activation of GABAB receptors by baclofen (1 µM, 10 µM) suppress synaptic transmission more in the ventral than the dorsal hippocampus. Using a 10-pulse stimulation train of variable frequency, we found that CCPA modulates short-term synaptic plasticity independently of the suppression of synaptic transmission in both segments of the hippocampus and at stimulation frequencies greater than 10 Hz. However, specifically regarding the paired-pulse ratio (PPR) and frequency facilitation/depression (FF/D) we found significant drug action before but not after adjusting conditioning responses to control levels. Activation of GABABRs by baclofen suppressed synaptic transmission more in the ventral than the dorsal hippocampus. Furthermore, relatively high (10 µM) but not low (1 µM) baclofen concentration enhanced both PPR and FF in both hippocampal segments at stimulation frequencies greater than 1 Hz, independently of the suppression of synaptic transmission by baclofen. These results show that A1Rs and GABABRs control synaptic transmission more effectively in the dorsal and the ventral hippocampus, respectively, and suggest that these receptors modulate PPR and FF/D at different frequency bands of afferent input, in both segments of the hippocampus.

7.
Curr Eye Res ; 47(7): 1003-1008, 2022 07.
Artigo em Inglês | MEDLINE | ID: mdl-35322737

RESUMO

PURPOSE: The role of angiogenic factors -such as vascular endothelial growth factor (VEGF) - in the development and progression of pterygia lesions remains under investigation. In the current study, we analyzed VEGF protein expression in a series of pterygia and normal conjunctiva epithelia. METHODS: Using a liquid-based cytology assay, thirty (n = 30) cell specimens were obtained by applying a smooth scraping on conjunctiva epithelia and fixed accordingly. None of them had a history of Human Papillomavirus (HPV) infection. Similarly, the same process was applied also in normal conjunctiva epithelia (n = 10; control group). We constructed five (n = 5) slides each containing eight (n = 8) cell spots. An immunocytochemistry (ICC) assay was implemented. Digital image analysis was also performed for evaluating objectively the corresponding immunostaining intensity levels. RESULTS: All the examined pterygia cell samples over-expressed the marker. High staining intensity levels were detected in 15/30 (50%), whereas the rest 15/30 (50%) demonstrated moderate expression. Overall VEGF expression was statistically significantly higher in pterygia compared to normal conjunctiva epithelia (p=.0001). Concerning the other parameters, VEGF protein expression did not associate with the gender of the patients (p = 0.518), the presence of a recurrent lesion (p = 0.311), the anatomical location (p = 0.191) or with their morphology (p = 0.316). Interestingly, the recurrent lesions demonstrated the highest levels of VEGF expression. CONCLUSIONS: VEGF overexpression is a frequent event in pterygia playing a potentially central molecular role in the progression of the lesion. Cell spot array analysis -based on liquid cytology- seems to be an innovative, easy-to-use technique for analyzing a broad variety of molecules in multiple specimens on the same slide by applying different ICC assays.


Assuntos
Túnica Conjuntiva , Pterígio , Fator A de Crescimento do Endotélio Vascular , Alphapapillomavirus , Túnica Conjuntiva/anormalidades , Túnica Conjuntiva/metabolismo , Túnica Conjuntiva/patologia , Túnica Conjuntiva/virologia , Humanos , Papillomaviridae/metabolismo , Pterígio/diagnóstico , Pterígio/metabolismo , Pterígio/virologia , Fator A de Crescimento do Endotélio Vascular/biossíntese
8.
In Vivo ; 36(1): 13-29, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-34972696

RESUMO

Chronic and acute respiratory diseases pose a major problem for public health worldwide due to the high morbidity and mortality rates, while treatment options remain mostly symptomatic. The renin-angiotensin system (RAS) plays an important role in lung tissue, regulating pulmonary circulation and blood pressure, but also contributing to normal pulmonary function and development. Angiotensin-converting enzyme (ACE) and its homologous angiotensin-converting enzyme 2 (ACE2) are considered to be amongst the main RAS regulators and are highly expressed in the pulmonary vascular endothelium. This review discusses the impact of ACE and ACE2 functional gene polymorphisms on seven major pulmonary diseases, in terms of predisposition, course, and outcome, revealing their potential utility as both genetic markers and biomarkers. The discussed conditions include chronic obstructive pulmonary disease (COPD), pulmonary hypertension (PH), asthma, acute lung injury (ALI), acute respiratory distress syndrome (ARDS), lung cancer and pulmonary sarcoidosis (PS), as well as SARS-CoV-2 viral infection and COVID-19 disease.


Assuntos
Enzima de Conversão de Angiotensina 2 , COVID-19 , Peptidil Dipeptidase A , Humanos , Peptidil Dipeptidase A/genética , Polimorfismo Genético , Sistema Renina-Angiotensina/genética , SARS-CoV-2
9.
J BUON ; 26(5): 1719-1722, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34761574

RESUMO

Coronavirus-related Severe Acute Respiratory Syndrome (SARS-CoV) in 2002/2003, Middle-East Respiratory Syndrome (MERS-Cov) in 2012/2013, and especially the current 2019/2020 Severe Acute Respiratory Syndrome-2 (SARS-CoV-2) tested the national health systems' endurance worldwide. In order to fight this emergency situation, a variety of pharmaceutical companies focused on the design and development of efficient vaccines that are considered necessary for providing a level of normalization in totally affected human social-economical activity worldwide. COVID-19 led to an increased uncertainty in the field of oncological patients' management disrupting the normal conditions of therapeutic and monitoring procedures. In the current article, we explored the impact of SARS-CoV-2 infection on oral carcinoma patients. We observed COVD-19 pandemic negatively affects the normality regarding early diagnosis and optimal management (surgical operation, post-operational follow up/monitoring) in HNSCC/OSCC patients. Understanding the involvement of SARS-CoV-2 in the progression of malignancies is the first critical step for targeting the virus by efficient monoclonal antibodies and vaccines.


Assuntos
COVID-19/complicações , Neoplasias Bucais/patologia , SARS-CoV-2/isolamento & purificação , COVID-19/transmissão , COVID-19/virologia , Gerenciamento Clínico , Humanos , Neoplasias Bucais/epidemiologia , Neoplasias Bucais/terapia , Neoplasias Bucais/virologia
11.
J BUON ; 26(4): 1194-1197, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34564968

RESUMO

Gross chromosomal and specific gene alterations are genetic aspects that are involved in rise, progression, and metastatic expansion of malignances. Concerning Uveal melanoma (UM), a variety of chromosome and gene functional and numerical imbalances in crucial molecular pathways such as cell cycle regulation, signaling transduction, apoptosis or angiogenesis have been identified and explained. UM is the most common primary ocular malignancy demonstrating increased rates, especially in middle-aged white (Caucasian) populations. Chronic exposure to ultraviolet rays/sunlight, race, gender (males), or some familial hereditary syndrome in sub-groups of patients are major factors correlated to increased risk for UM rise and progression. Specific genetic signatures at the level of chromosomal instability (CI) or at the gene mutations status characterize sub-groups of patients affecting the biological behaviour of the tumour leading to aggressive phenotypes (advanced stage-distant metastases, poor response, and survival rates). Sporadic or hereditary mediated mutations in genes including BAP1, EIF1AX, GNA11, GNAQ CHEK2, PALB2, SMARCE1, MBD4, MSH6 and MLH1. In the current molecular review, we present specific mutations -as a landscape- that are implicated in UM genetic substrate and create a variety of genetic signatures in the corresponding patients.


Assuntos
Melanoma/genética , Mutação , Neoplasias Uveais/genética , Humanos
12.
J BUON ; 26(4): 1313-1319, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34564986

RESUMO

PURPOSE: The concurrent prevalence investigation of human papillomavirus (HPV), Mycoplasma hominis (Mh) and Ureaplasma urealyticum (Uu) in women in order to estimate the association of co-infection with cervical lesions. METHODS: The study cohort comprised 120 women with no cervical lesions (control group) and 62 women with abnormal cytological findings from the cervix (cervical intraepithelial lesion/neoplasia) as study group. A combination of molecular analyses was implemented. RESULTS: The presence of HPV infection was shown in 52/62 (83.9%) of women with abnormal cytology. Women with cervix cytological findings were shown to have 17.6 times higher risk for Mh and Uu co-infection (p=0.001). HPV and Uu co-infection were detected with a higher prevalence among women with CIN 3 and invasive cancer. CONCLUSION: These findings are consistent with the notion that microbial co-infections may play an important role in persistent inflammation and progression of cervical lesions.


Assuntos
Carcinoma/complicações , Coinfecção/epidemiologia , Mycoplasmataceae , Infecções por Mycoplasmatales/complicações , Infecções por Papillomavirus/complicações , Displasia do Colo do Útero/complicações , Neoplasias do Colo do Útero/complicações , Adolescente , Adulto , Idoso , Estudos de Coortes , Feminino , Humanos , Pessoa de Meia-Idade , Adulto Jovem
14.
Anticancer Res ; 41(1): 163-167, 2021 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-33419809

RESUMO

BACKGROUND/AIM: Oral squamous cell carcinoma (OSCC) demonstrates aggressive biological behavior in subgroups of patients with specific molecular characteristics. Concerning metastatic potential, disruption of cell to cell adhesion is a critical event in epithelial malignancies including OSCC. Our aim was to investigate the role of E-Cadherin expression in OSCC patients as a valuable protein marker. MATERIALS AND METHODS: Fifty (n=50) tissue sections derived from primary OSCCs were analyzed by implementing an immunohistochemistry (IHC) assay based on a proper anti-E-cadherin antibody. Digital image analysis was also implemented for an objective evaluation of the corresponding protein expression levels. RESULTS: E-cadherin altered expression (low to negative) was observed in 34/50 (68%) cases, whereas the rest (16/50-32%) demonstrated normal (high to moderate) expression. E-Cadherin abnormal expressionwas associated with the stage of the examined malignancies (p=0.023), whereas no significant correlations with grade, gender, smoking status or human papilloma virus (HPV) history were observed. CONCLUSION: E-Cadherin down regulation is frequently observed in OSCC and is correlated to a progressively aggressive phenotype of the malignancy in the corresponding patients (advanced stage), but it seems that the impact of HPV persistent infection on these patients is not a critical parameter.


Assuntos
Alphapapillomavirus , Caderinas/genética , Carcinoma de Células Escamosas/etiologia , Expressão Gênica , Neoplasias Bucais/etiologia , Infecções por Papillomavirus/complicações , Biomarcadores Tumorais , Caderinas/metabolismo , Carcinoma de Células Escamosas/metabolismo , Carcinoma de Células Escamosas/patologia , Suscetibilidade a Doenças , Feminino , Humanos , Imuno-Histoquímica , Masculino , Neoplasias Bucais/metabolismo , Neoplasias Bucais/patologia , Gradação de Tumores , Estadiamento de Neoplasias , Infecções por Papillomavirus/virologia
15.
Respirology ; 23(10): 942-949, 2018 10.
Artigo em Inglês | MEDLINE | ID: mdl-29741298

RESUMO

BACKGROUND AND OBJECTIVE: The role of vascular endothelial growth factor (VEGF)-A in the resolution of ventilator-associated pneumonia (VAP) was investigated in clinical and mouse pneumonia models. METHODS: VEGF-A was measured for seven consecutive days by an immunosorbent assay in sera of 82 patients with VAP and changes from baseline were correlated with the resolution of VAP. Experimental animals were challenged intratracheally with Pseudomonas aeruginosa. Mouse bronchoalveolar lavage (BAL) samples and segments of lung tissue were obtained at 24, 48 and 124 h after bacterial challenge. Levels of VEGF-A, tumour Necrosis Factor alpha (TNF-α), interleukin (IL)-1ß, interferon-gamma (IFNγ) and myeloperoxidase (MPO) activity were measured in these samples. RESULTS: VAP resolved in 36.1% of patients with a less than 45% increase of VEGF-A on day 5 compared to 65.2% of patients with a more than 45% increase (P = 0.014). This was also accompanied by an earlier resolution of VAP (log-rank: 7.99; P = 0.005) and it was not pathogen-specific. The increase of VEGF-A was an independent variable associated with VAP resolution in forward logistic regression analysis where Acute Physiology and Chronic Health Evaluation (APACHE) II and Sequential Organ Failure Assessment (SOFA) scores were included as independent variables. VEGF-A in mouse BAL and lung tissue increased significantly at 124 h but not with the other mediators. In mice pre-treated with bevacizumab, VEGF-A concentrations decreased while TNF-α and MPO significantly increased. CONCLUSION: In patients, an association between increased levels of circulating VEGF-A and VAP resolution was observed. The mouse study suggests that elevated VEGF-A levels may be associated with lung inflammation resolution. CLINICAL TRIAL REGISTRATION: NCT00297674 at www.clinicaltrials.gov.


Assuntos
Pneumonia Bacteriana/metabolismo , Pneumonia Associada à Ventilação Mecânica/sangue , Infecções por Pseudomonas/metabolismo , Pseudomonas aeruginosa , Fator A de Crescimento do Endotélio Vascular/sangue , Fator A de Crescimento do Endotélio Vascular/metabolismo , APACHE , Animais , Antibacterianos/uso terapêutico , Biomarcadores/sangue , Líquido da Lavagem Broncoalveolar/química , Claritromicina/uso terapêutico , Método Duplo-Cego , Humanos , Interferon gama/metabolismo , Interleucina-1beta/metabolismo , Camundongos , Peroxidase/metabolismo , Pneumonia Bacteriana/microbiologia , Pneumonia Associada à Ventilação Mecânica/tratamento farmacológico , Estudos Prospectivos , Fatores de Tempo , Fator de Necrose Tumoral alfa/metabolismo
16.
J Biol Chem ; 293(24): 9358-9369, 2018 06 15.
Artigo em Inglês | MEDLINE | ID: mdl-29700112

RESUMO

Mesenchymal stem cells (MSC) are suggested to be important progenitors of myofibroblasts in fibrosis. To understand the role of Rho GTPase signaling in TGFß-induced myofibroblast differentiation of MSC, we generated a novel MSC line and its descendants lacking functional Rho GTPases and Rho GTPase signaling components. Unexpectedly, our data revealed that Rho GTPase signaling is required for TGFß-induced expression of α-smooth muscle actin (αSMA) but not of collagen I α1 (col1a1). Whereas loss of RhoA and Cdc42 reduced αSMA expression, ablation of the Rac1 gene had the opposite effect. Although actin polymerization and MRTFa were crucial for TGFß-induced αSMA expression, neither Arp2/3-dependent actin polymerization nor cofilin-dependent severing and depolymerization of F-actin were required. Instead, F-actin levels were dependent on cell contraction, and TGFß-induced actin polymerization correlated with increased cell contraction mediated by RhoA and Cdc42. Finally, we observed impaired collagen I secretion in MSC lacking RhoA or Cdc42. These data give novel molecular insights into the role of Rho GTPases in TGFß signaling and have implications for our understanding of MSC function in fibrosis.


Assuntos
Actinas/genética , Colágeno Tipo I/genética , Regulação da Expressão Gênica , Células-Tronco Mesenquimais/metabolismo , Neuropeptídeos/metabolismo , Proteína cdc42 de Ligação ao GTP/metabolismo , Proteínas rac1 de Ligação ao GTP/metabolismo , Proteínas rho de Ligação ao GTP/metabolismo , Actinas/metabolismo , Animais , Diferenciação Celular , Células Cultivadas , Colágeno Tipo I/metabolismo , Células-Tronco Mesenquimais/citologia , Camundongos , Miofibroblastos/citologia , Miofibroblastos/metabolismo , Transdução de Sinais , Fator de Crescimento Transformador beta/metabolismo , Proteína rhoA de Ligação ao GTP
17.
Anticancer Res ; 36(9): 4607-11, 2016 09.
Artigo em Inglês | MEDLINE | ID: mdl-27630302

RESUMO

BACKGROUND/AIM: A deeper understanding of the complex molecular pathology of brain malignancies is needed in order to develop more effective and targeted therapies of these highly lethal disorders. In an effort to further enlighten the molecular pathology of brain oncogenesis involving the her-2 (erbB-2/neu/ngl)/N-ras/nf1 pathway, we screened the genotypes of specimens from various types of brain tumors. MATERIALS AND METHODS: The studied specimens included 35 biopsies of four general categories: 13 neuroglial tumors (4 astrocytomas, 2 oligodendrogliomas, 7 glioblastomas multiforme), 14 meningiomas, 3 other nervous system tumors (2 schwannomas, 1 craniopharyngioma) and 5 metastatic tumors (such as lung carcinomas and chronic myelocytic leukemia). Screening for most common mutations in oncogenes her-2, N-ras and tumor suppressor gene nf1 was conducted with molecular hybridization techniques (Southern blotting, dot blot and single-strand conformational polymorphism (SSCP) analysis, respectively), and was confirmed by DNA sequencing. RESULTS: Gene amplification of her-2 was observed in only two cases (6%), namely in one glioblastoma and in one meningioma. Screening of 3 hot spot codons of the N-ras gene (12, 13 and 61) and subsequent DNA sequencing revealed mutations in 19 biopsies encompassing all categories (54%). Screening for mutations in exons of the nf1 gene by SSCP analysis detected a novel nonsense mutation in exon 31 in a unique case of a glioblastoma biopsy (3%) taken from a patient without neurofibromatosis type I. CONCLUSION: Activated N-ras appears to be a major oncogene in brain oncogenesis, exhibiting the most important role in the her-2/N-ras/nf1 pathway.


Assuntos
Neoplasias Encefálicas/metabolismo , Carcinogênese/metabolismo , Análise Mutacional de DNA , Neurofibromina 1/metabolismo , Receptor ErbB-2/metabolismo , Proteínas ras/metabolismo , Adulto , Idoso , Biópsia , Códon , Éxons , Feminino , Perfilação da Expressão Gênica , Regulação Neoplásica da Expressão Gênica , Genes da Neurofibromatose 1 , Genes ras , Genótipo , Humanos , Masculino , Pessoa de Meia-Idade , Mutação , Polimorfismo Conformacional de Fita Simples , Análise de Sequência de DNA
18.
Immunol Lett ; 178: 68-76, 2016 10.
Artigo em Inglês | MEDLINE | ID: mdl-27515003

RESUMO

In order to investigate the role of T-helper 17 (Th17) cell activation in acute kidney injury (AKI) after septic shock, a two-stage approach was used. Firstly, peripheral blood mononuclear cells (PBMCs) and CD4-lymphocytes were isolated the first 24h after septic shock from 26 patients with AKI and 18 patients with chronic renal disease (CRD) without AKI and stimulated for the release of tumour necrosis factor-alpha (TNFα), interleukin (IL)-10, IL-17, IL-22 and interferon-gamma (IFNγ). Results were compared with 15 healthy volunteers and 13 patients with uncomplicated sepsis. Secondly, a murine model of multiple organ dysfunction (MODS) complicated with AKI and bacterial gut translocation was studied, and IL-10, IL-17, IL-22 and IFNγ were measured in kidney homogenates. IL-17 was the only cytokine produced at greater quantities from PBMCs and CD4-lymphocytes of patients with septic shock and AKI than comparators. When PBMCs of patients with septic shock and AKI were ex-vivo stimulated, intracellular staining for IL-17 was greater in CD3(+)/CD4(+)/CD196(+) cells compared to patients with septic shock and CRD. IL-17 was released at greater amounts from PBMCs of non-survivors by septic shock and AKI but not of septic shock and CRD. In the murine model of MODS, a gradual decrease of IL-17, but not of IL-10, IL-22 and IFNγ, of kidney homogenates was found indicating over-consumption. These results suggest that AKI after septic shock is driven through IL-17 release by Th17 cells; this is gradually consumed in the kidney.


Assuntos
Injúria Renal Aguda/etiologia , Injúria Renal Aguda/metabolismo , Interleucina-17/biossíntese , Choque Séptico/complicações , Injúria Renal Aguda/diagnóstico , Injúria Renal Aguda/mortalidade , Idoso , Idoso de 80 Anos ou mais , Animais , Biomarcadores , Comorbidade , Citocinas/biossíntese , Modelos Animais de Doenças , Feminino , Humanos , Imunofenotipagem , Mediadores da Inflamação/metabolismo , Leucócitos Mononucleares/imunologia , Leucócitos Mononucleares/metabolismo , Masculino , Pessoa de Meia-Idade , Prognóstico , Choque Séptico/etiologia , Subpopulações de Linfócitos T/imunologia , Subpopulações de Linfócitos T/metabolismo , Células Th17/imunologia , Células Th17/metabolismo
19.
Anticancer Res ; 33(9): 4033-9, 2013 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-24023347

RESUMO

It is well-known that there is an interplay between hemostasis, thrombosis and cancer. Functional DNA polymorphisms in genes encoding factors related to thrombosis have been associated with increased risk for oral squamous cell carcinoma (OSCC). The present study investigated the possible combinatory effect of 10 such polymorphisms as primary risk predictors for OSCC in a European population. Two groups including 160 patients with OSCC and 168 healthy controls of Greek and German origin were studied. The patient and control groups were comparable regarding ethnicity, age and gender. For all studied individuals, 10 genotypes of functional polymorphisms were investigated: 5,10-methylene tetrahydrofolate reductase (MTHFR) C677T, coagulation factor V (F5) Leiden, coagulation factor II (F2, also known as prothrombin) G20210A, coagulation factor XII (F12) C46T, coagulation factor XIII A1 subunit (F13A1) Val34Leu, serpine1 (SERPINE1, also known as plasminogen activator inhibitor-1) 4G/5G, protein Z (PROZ) -A13G, angiotensin I-converting enzyme (ACE) I/D, angiotensinogen (AGT) Met325Thr, and carboxypeptidase B2 (CPB2, also known as thrombin-activatable fibrinolysis inhibitor) C1040T. Multivariate logistic regression models were used in order to evaluate the relation and contribution of homozygous and heterozygous variant polymorphisms upon overall, early and advanced stages of OSCC. Five out of the studied polymorphisms, influencing the expression of SERPINE1 and ACE genes, as well as the activity of CPB2, F12 and F13 proteins, were recognized as significant predictive factors for OSCC. The 'mode of inheritance' regression model, in particular, revealed the low expression I allele of ACE to be a primary predictor in overall, early and advanced stages of oral cancer. Comparing the present findings with previous knowledge, possible interactions of these factors and their relation to the risk for OSCC development are discussed.


Assuntos
Carcinoma de Células Escamosas/genética , Predisposição Genética para Doença , Neoplasias Bucais/genética , Polimorfismo Genético , Trombose/genética , Carcinoma de Células Escamosas/complicações , Estudos de Casos e Controles , Genótipo , Humanos , Neoplasias Bucais/complicações , Análise de Regressão , Estudos Retrospectivos , Trombose/complicações
20.
Gynecol Oncol ; 129(2): 395-400, 2013 May.
Artigo em Inglês | MEDLINE | ID: mdl-23428459

RESUMO

OBJECTIVE: Human papillomavirus (HPV) is strongly associated with cervical cancer and possibly with some oropharyngeal cancers. However, the relation between oral and cervical HPV infection is not fully understood. This study evaluates the prevalence rate and type-concordance of HPVs in these areas. METHODS: HPV DNA typing was performed in saliva and cervical specimens of 43 sexually active women, with the use of general consensus PCR and nested PCR (NPCR) tests. RESULTS: The prevalence rate of HPV DNA in cervical and saliva samples was 51.2% and 11.6% with general PCR, and 60.5% and 44.2% with NPCR, respectively. The probability of HPV DNA detection with general PCR in saliva was about 8 times lower compared to the cervix (P<0.001, OR: 0.13, 95% CI: 0.04-0.37), but showed no difference when the more sensitive NPCR method was applied (P=0.139, OR: 0.52, 95% CI: 0.22-1.21). The distribution of HPV variants according to their oncogenic potential revealed no statistically significant difference, regardless to the PCR method used for both sites. All general PCR HPV DNA positive saliva specimens belonged to women with cytology findings (n=5). These women had also 8.5 times higher risk for presenting with positive HPV detection in saliva with the NPCR method (P=0.009, OR=8.50, 95% CI: 1.74-39.70). CONCLUSIONS: Women with genital HPV infection are at higher risk for asymptomatic oral HPV infection. Prophylactic HPV-vaccination may reduce the burden of HPV-related diseases in both cervix and oropharynx.


Assuntos
Alphapapillomavirus/isolamento & purificação , Infecções Assintomáticas/epidemiologia , Testes de DNA para Papilomavírus Humano , Infecções por Papillomavirus/epidemiologia , Saliva/virologia , Esfregaço Vaginal , Adulto , Alphapapillomavirus/genética , Estudos de Coortes , DNA Viral , Feminino , Grécia/epidemiologia , Testes de DNA para Papilomavírus Humano/métodos , Humanos , Pessoa de Meia-Idade , Infecções por Papillomavirus/diagnóstico , Reação em Cadeia da Polimerase , Comportamento Sexual
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