The effect of resveratrol and its methylthio-derivatives on EGFR and Stat3 activation in human HaCaT and A431 cells

Epidermal growth factor receptor (EGFR) interacting with Stat3 is considered to be an attractive therapeutic target. In the current study, we investigated the effect of resveratrol and its two 4′-methylthio-trans-stilbene derivatives (3-M-4′-MTS; S2) (3,5-DM-4″-MTS; S5) on EGFR and Stat3 activation in human immortalized HaCaT keratinocytes and epidermoid carcinoma A431 cells. In the HaCaT cells both derivatives, similarly as resveratrol, decreased the total level of the EGFR receptor. In the A431 cells, resveratrol in the higher dose significantly (p < 0.05) reduced Y1173 and Y1068 EGFR residue phosphorylation, while S2 affected only the phosphorylation of the Y1068 residue. In this cell line, resveratrol in both tested doses and the S2 derivative in the lower concentration significantly diminished Stat3 binding capacity to the DNA consensus site. The effect of the tested compounds on Stat3 activation in HaCaT cells was only slightly affected. These results indicate that methylthiostilbenes are not more potent modulators of the EGFR/Stat3 complex than resveratrol and that introducing an additional methoxy group makes them less effective

Dynamika niemieckiej opinii publicznej: Wizerunek Polski i Polaków w Niemczech

The image of Poland and Poles in Germany emerging from the analysis of public opinion polls and press publications remains ambiguous - it is characterized by complexity and a lack of internal consistency. Positive aspects of the image of Poland and Poles are present to a greater extent in the German press than in the results of public opinion polls. The results of the polls also show a greater inconsistency in the image of Poland and Poles in Germany than press narratives. Two elements of Poland's image are particularly noteworthy in the German press: as an important European actor and as a country with a dynamically developing economy. From the Polish point of view, these two elements should constitute an important "anchor", a kind of starting point organizing the discussion about Poland in the German media. burdened with stereotypes. This is mainly due to the relatively poor knowledge of Germany's eastern neighbor. Poles living in Germany are not of special interest to either the German media or the public. They are also not present in the public discourse themselves. Locally, there was also a lot of interest in the issue of emigration to border areas - especially Mecklenburg-Vorpommern

Adrenal “nonadenoma” — clinical characteristics and risk of malignancy

Introduction: There is an increasing number of adrenal tumours discovered incidentally during imaging examinations performed for many different indications. Based on imaging results, it is possible to differentiate benign from malignant adrenal masses, although there is still a number of equivocal imaging findings. Our study presents 77 cases of adrenal tumours in which imaging was inconclusive and the final diagnosis was stated only after surgery and histopathological examination.  Material and methods: Retrospective data analysis: 77 cases of indeterminate adrenal tumours with a presumptive diagnosis of “nonadenoma” in patients operated within a 16-year period (2004–2019). None of the patients had a history of malignancy, and all tumours were hormonally inactive. On contrast-enhanced computed tomography (CT), the native density of all tumours was higher than 10 Hounsfield Units (HU), and the absolute percentage washout (APW) and relative percentage washout (RPW) were lower than 60% and 40%, respectively. Results: The most common findings were adrenal adenoma (25.9%), macronodular adrenal hyperplasia (16.9%), ganglioneuroma (15.6%), and haemorrhage with posthaemorrhagic changes (13%). In total, there were 12 various histopathological diagnoses in this group. There were only 2 (2.6%) malignant (adrenal cancer and leiomyosarcoma) and 3 (3.9%) potentially malignant (pheochromocytoma) lesions in this group. Conclusions: It is often impossible to make a correct diagnosis in a clinical setting until it is histologically verified. “Nonadenoma” adrenal tumours constitute a heterogeneous group including very rare pathologies. The risk of malignancy in indeterminate adrenal tumours is relatively low.

Neuroendocrine neoplasms of the small intestine and the appendix - management guidelines (recommended by the Polish Network of Neuroendocrine Tumours).

This study presents the revised Polish guidelines regarding the management of patients suffering from neuroendocrine neoplasms (NENs) of the small intestine and appendix. The small intestine, especially the ileum, is the most common location for these neoplasms. Most are well differentiated and slow growing. Their symptoms may be atypical, which can result in delayed or accidental diagnosis. Appendicitis is usually the first manifestation of NEN in this location. Typical symptoms of carcinoid syndrome occur in approximately 20-30% of patients suffering from small intestinal NENs with distant metastases. The main cause of death in patients with carcinoid syndrome is carcinoid heart disease. The most useful laboratory test is the determination of chromogranin A, while concentration of 5-hydroxyindoleacetic acid is helpful in the diagnostics of carcinoid syndrome. For visualisation, ultrasound, computed tomography, magnetic resonance imaging, colonoscopy, video capsule endoscopy, double-balloon enteroscopy, and somatostatin receptor scintigraphy may be used. A detailed his-tological report is crucial for the proper diagnostics and therapy of NENs of the small intestine and appendix. The treatment of choice is surgical management, either radical or palliative. The pharmacological treatment of the hormonally active and non-active small intestinal NENs as well as NENs of the appendix is based on long-acting somatostatin analogues. In patients with generalised NENs of the small intestine in progress during the SSA treatment, with good expression of somatostatin receptors, the first-line treatment should be radio-isotope therapy, while targeted therapies, such as everolimus, should be considered afterwards. When the above therapies are exhausted, in certain cases chemotherapy may be considered

High efficiency protocol of DNA extraction from Micromys minutus mandibles from owl pellets : a tool for molecular research of cryptic mammal species

Owl pellets have high potential as a source of DNA. However, this noninvasive method of collecting DNA is rarely used, and its methodological aspects are poorly understood. We investigated the methodology for DNA extraction and amplification from owl pellets containing the smallest European rodent-the Harvest mouse Micromys minutus-as an example. We used mandibles identified in owl pellets for mitochondrial and nuclear DNA amplification. For DNA extraction, we tested two commercial protocols and utilized a protocol being a combination of two commercial kits which ensured high efficiency of DNA extraction. Additionally, we recorded that the amount of DNA was five times higher in extracts from teeth as compared to DNA extracts from jawbones derived from the same mandible. The quantity of DNA was significantly positively correlated with biological sample weight; however, the age of the pellet remains had an impact on the level of inhibition. We recorded inhibition in 40 % of mtDNA extracts derived from pellets older than 150 months, whereas in DNA extracts from pellets younger than 80 months, we did not observe a negative impact of inhibition on PCR efficiency. The amplification success rate was 89.9 % for the mitochondrial fragment and 39.4 % in the case of the nuclear fragment. We observed partial degradation of DNA evidenced by the fact that the longest fragments that we were able to amplify in the case of mtDNA were 450 and 200 bp for nuDNA. The study shows that pellets can be considered as a source of DNA and have high potential for molecular research in the case of threatened species and species that are difficult to study using standard field techniques

High efficiency protocol of DNA extraction from Micromys minutus mandibles from owl pellets : a tool for molecular research of cryptic mammal species

Owl pellets have high potential as a source of DNA. However, this noninvasive method of collecting DNA is rarely used, and its methodological aspects are poorly understood. We investigated the methodology for DNA extraction and amplification from owl pellets containing the smallest European rodent-the Harvest mouse Micromys minutus-as an example. We used mandibles identified in owl pellets for mitochondrial and nuclear DNA amplification. For DNA extraction, we tested two commercial protocols and utilized a protocol being a combination of two commercial kits which ensured high efficiency of DNA extraction. Additionally, we recorded that the amount of DNA was five times higher in extracts from teeth as compared to DNA extracts from jawbones derived from the same mandible. The quantity of DNA was significantly positively correlated with biological sample weight; however, the age of the pellet remains had an impact on the level of inhibition. We recorded inhibition in 40 % of mtDNA extracts derived from pellets older than 150 months, whereas in DNA extracts from pellets younger than 80 months, we did not observe a negative impact of inhibition on PCR efficiency. The amplification success rate was 89.9 % for the mitochondrial fragment and 39.4 % in the case of the nuclear fragment. We observed partial degradation of DNA evidenced by the fact that the longest fragments that we were able to amplify in the case of mtDNA were 450 and 200 bp for nuDNA. The study shows that pellets can be considered as a source of DNA and have high potential for molecular research in the case of threatened species and species that are difficult to study using standard field techniques