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    Wyświetlanie 1-8 z 8
    Tytuł:
    Expression profiles of MGMT, p16, and APC genes in tumor and matching surgical margin from patients with oral squamous cell carcinoma
    Autorzy:
    Strzelczyk, Joanna
    Gołąbek, Karolina
    Krakowczyk, Łukasz
    Owczarek, Aleksander
    Powiązania:
    https://bibliotekanauki.pl/articles/1038771.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    HNSCC
    gene expression
    surgical margin
    MGMT
    p16
    APC
    Opis:
    The aim of the study was to assess the expression of MGMT, p16, and APC genes in tumors and matching surgical margin samples from 56 patients with primary OSCC. We also analyzed the association of the clinical variables with the expression of the studied genes. After RNA isolation and cDNA synthesis gene expression levels were assessed by quantitative reverse transcription (qRT)-PCR. Two-sided parametrical Student's t-test for independent groups with equal/unequal variances showed no statistically significant differences in genes' expression in tumor compared to margin samples. No association was found between the genes' expression and clinical parameters, except for MGMT, whose low expression was probably associated with smoking (0.87 vs 1.34, p=0.065). 'Field cancerization' is an area with genetically or epigenetically altered cells and at the same time a risk factor for cancer. Disturbances in gene expression could also be the source of damages leading to cancerization. In conclusion, it is important to mention that the field remaining after a surgery may pose an increased risk of cancer development. It may be suggested that the diagnosis and treatment of cancers should not be concentrated only on the tumor itself, but also on the cancer field effect. Therefore, further molecular analysis on surgical margins and additional research regarding their assessment are required.
    Źródło:
    Acta Biochimica Polonica; 2016, 63, 3; 505-509
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nucleotide substitutions in the Candida albicans ERG11 gene of azole-susceptible and azole-resistant clinical isolates
    Autorzy:
    Strzelczyk, Joanna
    Ślemp-Migiel, Anna
    Rother, Magdalena
    Gołąbek, Karolina
    Wiczkowski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1039442.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Candida albicans
    ERG11 gene
    sterol 14α demethylase
    azole resistance
    Opis:
    One of the mechanisms of Candida albicans resistance to azole drugs used in antifungal therapy relies on increased expression and presence of point mutations in the ERG11 gene that encodes sterol 14α demethylase (14DM), an enzyme which is the primary target for the azole class of antifungals. The aim of the study was to analyze nucleotide substitutions in the Candida albicans ERG11 gene of azole-susceptible and azole-resistant clinical isolates. The Candida albicans isolates represented a collection of 122 strains selected from 658 strains isolated from different biological materials. Samples were obtained from hospitalized patients. Fluconazole susceptibility was tested in vitro using a microdilution assay. Candida albicans strains used in this study consisted of two groups: 61 of the isolates were susceptible to azoles and the 61 were resistant to azoles. Four overlapping regions of the ERG11 gene of the isolates of Candida albicans strains were amplified and sequenced. The MSSCP (multitemperature single strand conformation polymorphism) method was performed to select Candida albicans samples presenting genetic differences in the ERG11 gene fragments for subsequent sequence analysis. Based on the sequencing results we managed to detect 19 substitutions of nucleotides in the ERG11 gene fragments. Sequencing revealed 4 different alterations: T495A, A530C, G622A and A945C leading to changes in the corresponding amino acid sequence: D116E, K128T, V159I and E266D. The single nucleotide changes in the ERG11 gene did not affect the sensitivity of Candida albicans strains, whereas multiple nucleotide substitutions in the ERG11 gene fragments indicated a possible relation with the increase in resistance to azole drugs.
    Źródło:
    Acta Biochimica Polonica; 2013, 60, 4; 547-552
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected mechanisms of molecular resistance of Candida albicans to azole drugs
    Autorzy:
    Gołąbek, Karolina
    Strzelczyk, Joanna
    Owczarek, Aleksander
    Cuber, Piotr
    Ślemp-Migiel, Anna
    Wiczkowski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1039099.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Candida albicans
    drug resistance
    azoles
    Opis:
    A phenomenon of increasing resistance of Candida spp. to azoles has been observed for several years now. One of the mechanisms of lack of sensitivity to azoles is associated with CDR1, CDR2, MRD1 genes (their products are active transport pumps conditioning drug efflux from pathogen's cell), and ERG11 gene (encoding lanosterol 14α-demethylase). Test material was 120 strains of Candida albicans (60 resistant and 60 susceptible to azole drugs) obtained from clinical samples. The first stage of experiment assessed the expression of CDR1, CDR2, MDR1 and ERG11 genes by Q-PCR. The impact of ERG11 gene's mutations on the expression of this gene was analysed. The final stage of the experiment assessed the level of genome methylation of Candida albicans strains. An increase in the expression of CDR2, MDR1 and ERG11 was observed in azole-resistant strains of Candida albicans in comparison to strains sensitive to this class of drugs. Furthermore, 19 changes in the sequence of ERG11 were detected in tested strains. Four of the discovered mutations: T495A, A530C, G622A and A945C led to the following amino acid substitutions: D116E, K128T, V159I and E266D, respectively. It has also been found that statistically five mutations: T462C, G1309A, C216T, C1257T and A945C affected the expression of ERG11. The applied method of assessing the level of methylation of Candida albicans genome did not confirm its role in the development of resistance to azoles. The results indicate however, that resistance of Candida albicans strains to azole drugs is multifactorial.
    Źródło:
    Acta Biochimica Polonica; 2015, 62, 2; 247-251
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of activation of insulin-like growth factors in colorectal cancer
    Autorzy:
    Walkiewicz, Katarzyna
    Nowakowska-Zajdel, Ewa
    Strzelczyk, Joanna
    Walczak, Michał
    Copija, Angelika
    Janion, Karolina
    Muc-Wierzgoń, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/1062926.pdf
    Data publikacji:
    2017
    Wydawca:
    Medical Education
    Tematy:
    IGF-receptors
    colorectal cancer
    insulin-like growth factors
    metabolic disorders
    Opis:
    Co-occurrence of metabolic disorders is a recognized risk factor for the development of colorectal cancer which is currently the leading cause of morbidity due to malignant neoplasms in the world. The pathogenesis of colorectal cancer is not well understood yet. Among the postulated neoplastic mechanisms is the activation of insulin-like growth factors, with both epidemiological and clinical observations of their role. In this paper, the authors synthesize the current knowledge about the importance of activation of insulin-like growth factors in the development of colorectal cancer.
    Źródło:
    OncoReview; 2017, 7, 3; 116-120
    2450-6125
    Pojawia się w:
    OncoReview
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of MGMT polymorphisms rs12917 and rs11016879 in head and neck cancer risk and prognosis
    Autorzy:
    Kiczmer, Paweł
    Prawdzic Seńkowska, Alicja
    Strzelczyk, Joanna
    Szydło, Błażej
    Biernacki, Krzysztof
    Osadnik, Tadeusz
    Krakowczyk, Łukasz
    Ostrowska, Zofia
    Powiązania:
    https://bibliotekanauki.pl/articles/1038528.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    MGMT
    head and neck cancer
    polymorphism
    rs12917
    rs11016879
    Opis:
    Head and neck squamous cell carcinoma (HNSCC) is one of the leading cancers by incidence worldwide. The risk of these cancers is strictly associated with alkylation factors present in tobacco smoke. The crucial role in preventing DNA alkylation is played by O6-methylguanine-DNA methyltransferase (MGMT). Dysfunction or lack of MGMT is associated with an increased risk of cancer. The aim of the study was to assess the influence of MGMT polymorphisms: rs12917 and rs11016879 on HNSCC risk and course. The study consisted of 69 HNSCC patients and 242 healthy individuals. Case samples were taken from resected tumour tissue. The control group comprised samples of epithelial cells collected from mucous membranes using swabs. DNA samples were genotyped by employing the 5' nuclease assay for allelic discrimination using TaqMan SNP Genotyping Assays. The significance between distributions of genotypes and alleles was tested using Pearson's χ2 test analysis. Our results indicated that the MGMT rs12917 TT genotype increases the risk of HNSCC. The MGMT rs11016879 AG genotype and A allele were associated with increased HNSCC risk. We noted higher risk of nodal metastasis in rs11016879 AA homozygotes. Mechanisms leading to MGMT enzymatic defect are unknown and hence further studies need to be carried out. Our data suggest that the examined polymorphisms may be considered as potential prognostic factors for HNSCC risk and outcome. Further studies are necessary to verify our results.
    Źródło:
    Acta Biochimica Polonica; 2018, 65, 1; 87-92
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The activity of antioxidant enzymes in colorectal adenocarcinoma and corresponding normal mucosa
    Autorzy:
    Strzelczyk, Joanna
    Wielkoszyński, Tomasz
    Krakowczyk, Łukasz
    Adamek, Brygida
    Zalewska-Ziob, Marzena
    Gawron, Katarzyna
    Kasperczyk, Janusz
    Wiczkowski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1039648.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    antioxidant enzymes
    corresponding normal mucosa
    colorectal adenocarcinoma
    oxidative stress
    Opis:
    Oxidative stress is one of several factors which contribute to the development of colorectal carcinogenesis. The aim of the study was an assessment of the activity of antioxidant enzymes in tumour and corresponding normal distal mucosa in a group of patients with colorectal adenocarcinoma. Samples of tumour and corresponding normal mucosa were obtained during a resection of colorectal cancer from 47 patients aged between 26 and 82 years. The average distance of corresponding normal distal mucosa from the tumour was 4.49 cm. Activities of antioxidant enzymes: superoxide dismutase (SOD), glutathione reductase (GR), glutathione peroxidase (GPx), glutathione S-transferase (GST), and catalase (CAT) were measured in tissue homogenates. The patients were grouped according to the tumour stage (Duke's staging), grading, localization, and size of tumour, as well as age and sex. Statistical analysis was performed. The activity of SOD and GPx was considerably increased, while the activity of GST decreased significantly in tumour as compared with normal mucosa. GR activity in colorectal cancer was evidently higher in tumours of proximal location compared with the distal ones. The distance of corresponding normal distal mucosa from the tumour was analyzed and related to all assayed parameters. A decreased GST activity was observed in corresponding normal mucosa more than 5 cm distant from the tumour in patients with CD Duke's stage. The higher activity of superoxide dismutase and glutathione peroxidase in tumour compared to corresponding normal mucosa could indicate higher oxidative stress in colorectal adenocarcinoma cells.
    Źródło:
    Acta Biochimica Polonica; 2012, 59, 4; 549-556
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neutrophil-lymphocyte ratio and creatinine reduction ratio predict good early graft function among adult cadaveric donor renal transplant recipients. Single institution series
    Autorzy:
    Hogendorf, Piotr
    Suska, Anna
    Skulimowski, Aleksander
    Rut, Joanna
    Grochowska, Monika
    Wencel, Aleksandra
    Dziwisz, Filip
    Nowicki, Michał
    Szymański, Dariusz
    Poznańska, Grażyna
    Durczyński, Adam
    Strzelczyk, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1392878.pdf
    Data publikacji:
    2018
    Wydawca:
    Index Copernicus International
    Tematy:
    neutrophil-lymphocyte ratio
    creatinine reduction ratio
    graft function
    cadaveric donor
    delayed graft function kidney transplant
    Opis:
    The Background Delayed graft function (DGF) is a common complication following kidney transplantation and is associated with ischemia-reperfusion injury (IRI). Lymphocytes contribute to the pathogenesis of IRI and ischemia-reperfusion related to delayed graft function. Materials and Methods : 135 Caucasian patients received a kidney graft from deceased heart-beating organ donors. We divided patients into 2 groups - patients with the eGFR>=30 on the 21st day post-transplantation (n=36) and patients with the eGFR<30 on the 21st day post-transplantation (n=99) to assess kidney graft function. We measured serum creatinine levels on 1st and 2nd post-transplant day and preoperative levels of monocytes, lymphocytes, platelets, and neutrophils and their ratios. Results: We have found statistically significant differences between the eGFR<30 and the eGFR>=30 groups in the average lnLymphocytes (0.36 +/-0.6 vs. -0.016 +/-0.74, respectively p=0.004) lnNLR (1,27 +/-0.92 vs. 1.73+/-1.08 p=0.016) lnLMR (1.01 +/-0.57 vs. 0.73 +/-0.64 p=0.02), lnPLR (4.97 +/-0.55 vs. 5.26 +/- 0.67 p=0.023), and CCR 2% (-20.20 +/- 21.55 vs. -4.29 +/- 29.62 p=0.004. In the univariate analysis, factors of lnLymphocytes >=0.22 (OR=0.331 95%CI 0.151-0.728 p=0.006), lnLMR>=1.4 (OR=0.255 95%CI 0.072-0.903 p=0.034) were associated with a worse graft function, while lnNLR>=1.05 (OR=2.653 95%CI 1.158-6,078 p=0.021), lnPLR>=5.15 (OR=2.536 95%CI 1.155-5.566 p=0.02) and CRR2 (OR=3.286 95% CI 1.359-7.944 p=0.008) indicated a better graft function. Conclusion: A higher absolute lymphocyte count (lnLymphocytes) and lnLMR, as well as lower lnNLR and lnPLR were associated with a lower eGFR on the 21st day after kidney transplantation. In the multivariate analysis, CRR2 in combination with either lnLymphocytes, lnNLR or lnPLR improved the accuracy of detecting patients with poor graft function.
    Źródło:
    Polish Journal of Surgery; 2018, 90, 2; 28-33
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elevated preoperative levels of CA 19-9 and CA 125 predicts overall survival time in the pancreatic adenocarcinoma. Single institution series.
    Autorzy:
    Hogendorf, Piotr
    Skulimowski, Aleksander
    Durczyński, Adam
    Kumor, Anna
    Poznańska, Grażyna
    Poznańska, Agnieszka
    Oleśna, Aleksandra
    Rut, Joanna
    Øvereng Juliebø, Siri
    Szmiel, Aneta
    Pirowski, Wojciech
    Strzelczyk, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1391695.pdf
    Data publikacji:
    2020
    Wydawca:
    Index Copernicus International
    Tematy:
    general surgery
    pancreatic neoplasms
    biomarkers
    prognostic factors
    Opis:
    Introduction: Pancreatic cancer is a devastating disease, being the seventh cause of cancer-related deaths worldwide. Its aggressiveness is due to its specific biology and the late diagnosis of cancer. Therefore, the prognosis for patients suffering from this cancer is dismal, with 5-year overall survival rate of around 6–10%. Up to date, only a complete surgical resection of the cancerous entity warrants a significant improvement in patients’ survival. Nevertheless, the pancreatic cancer’s biology is still not fully elucidated, so that the accuracy of prognosis for certain patients is highly uncertain. Consequently, the importance of both clinical and basic research aiming to reveal the crucial molecular factors affecting long-term prognosis should be highlighted. There is a growing number of evidence that biomarkers of PC not only reflect the presence of tumor itself but also present a “hint” regarding its physiology. Thus the aim of this study was to assess the levels of commonly measured biomarkers and their influence on patients’ overall survival. Materials and methods: The retrospective analysis of data on 129 patients admitted to our Department due to the diagnosis of pancreatic cancer was carried out. On the day of admission all the patients had their levels of CA19-9, CA125, CEA and CA15-3 measured. The overall survival (OS) was defined as time elapsing from the day of admission to the day of death. The Kaplan- Meier curves were built for all potential factors, Cox regression model was applied to carry out a multivariate analysis. Results: We retrospectively analyzed 129 patients with a mean age of 62 years. As many as 95 of them had an unresectable lesion and 34 underwent curative operation. In total, the analyzed patient group was characterized by a median survival of 7 months and 12 days. Cumulative 1-year, 2-year and 4-year survival rates were 35%, 16% and 15%, respectively. In univariate analysis, factors such as age >= 60, inoperable lesion, CA19-9 >= 200, CA125 >= 20 and Neutrophile to Lymphocyte Ratio (NLR) >= 5 were associated with a lower median OS. In multivariate analysis, three factors, CA19-9 >= 200, CA125 >= 20 and age >= 60, were found to be statistically significant. Indeed, patients possessing all of them noted much poorer outcomes regarding OS factors: 89 days versus 235 days for the other patients (log rank test P = 0.02). Conclusions: Our study fortifies the evidence that preoperative levels of CA19-9 and CA125 have a direct influence on the longterm OS. Interestingly, in our patient group, the correlation of biomarkers with OS was higher than that of resectability. However, our study has some limitations regarding, for instance, the lack of data on chemotherapy, comorbidities etc. In the view of recent molecular studies on mucin involvement in PC development, it provides a strong clinical evidence to prove their importance.
    Źródło:
    Polish Journal of Surgery; 2020, 92, 3; 32-38
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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