instruction:
Given a passage with a context and an answer, construct a question on the basis of the information present in the passage. Construct the question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) it answer uses text phrases from the passage. Avoid creating questions that (i) can't be answered correctly without actually understanding the passage and (ii) uses the same words or phrases given in the passage.
question:
Context: Reactive oxygen species have been implicated as signaling molecules modulating the activity of redox-sensitive transcription factors such as nuclear factor kappa B (NF-kappaB). Recently, the transcription factor hypoxia-inducible factor-1 (HIF-1), known to mediate gene expression by hypoxia, has been found to be also activated by nonhypoxic factors in a redox-sensitive manner. We therefore aimed to elucidate the link between these 2 important redox-sensitive transcription factors.', 'In pulmonary artery smooth muscle cells, reactive oxygen species generated either by exogenous H2O2 or by a NOX4-containing NADPH oxidase stimulated by thrombin activated or induced NF-kappaB and HIF-1alpha. The reactive oxygen species-mediated HIF-1alpha induction occurred on the transcriptional level and was dependent on NF-kappaB. Transfection experiments with wild-type or mutant HIF-1alpha promoter constructs revealed the presence of a yet unidentified NF-kappaB binding element. Gel shift analyses and chromatin immunoprecipitation verified binding of NF-kappaB to this site. Furthermore, reactive oxygen species enhanced expression of plasminogen activator inhibitor-1, which was prevented by dominant-negative IkappaB or mutation of the HIF-1 binding site within the plasminogen activator inhibitor-1 promoter.
Answer: These findings show for the first time to our knowledge that reactive oxygen species directly link HIF-1alpha and NF-kappaB, implicating an important pathophysiological role of this novel pathway in disorders associated with elevated levels of reactive oxygen species.
answer:
Do reactive oxygen species activate the HIF-1alpha promoter via a functional NFkappaB site?


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Context: To test whether a brief mindfulness meditation training intervention buffers self-reported psychological and neuroendocrine responses to the Trier Social Stress Test (TSST) in young adult volunteers. A second objective evaluates whether pre-existing levels of dispositional mindfulness moderate the effects of brief mindfulness meditation training on stress reactivity.', 'Sixty-six (N=66) participants were randomly assigned to either a brief 3-day (25-min per day) mindfulness meditation training or an analytic cognitive training control program. All participants completed a standardized laboratory social-evaluative stress challenge task (the TSST) following the third mindfulness meditation or cognitive training session. Measures of psychological (stress perceptions) and biological (salivary cortisol, blood pressure) stress reactivity were collected during the social evaluative stress-challenge session.', 'Brief mindfulness meditation training reduced self-reported psychological stress reactivity but increased salivary cortisol reactivity to the TSST, relative to the cognitive training comparison program. Participants who were low in pre-existing levels of dispositional mindfulness and then received mindfulness meditation training had the greatest cortisol reactivity to the TSST. No significant main or interactive effects were observed for systolic or diastolic blood pressure reactivity to the TSST.
Answer: The present study provides an initial indication that brief mindfulness meditation training buffers self-reported psychological stress reactivity, but also increases cortisol reactivity to social evaluative stress. This pattern may indicate that initially brief mindfulness meditation training fosters greater active coping efforts, resulting in reduced psychological stress appraisals and greater cortisol reactivity during social evaluative stressors.
answer:
Does brief mindfulness meditation training alter psychological and neuroendocrine responses to social evaluative stress?


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Context: Lymph node metastasis is one of the most important prognostic factors in patients with esophageal squamous cell carcinoma (ESCC). Neoadjuvant treatment can reduce micrometastasis in lymph nodes to enable curative resection by down staging. The aim of this study was to evaluate the histological effect of neoadjuvant therapy on lymph node metastasis of ESCC by performing immunohistochemistry for cytokeratin staining.', 'A total of 3061 lymph nodes were examined from 62 patients who received neoadjuvant treatment followed by esophagectomy with lymphadenectomy.', 'We observed positive staining for cytokeratin in 276 (9.0%) lymph nodes, which included overt metastasis, micrometastasis and hyalinized cytokeratin particles (HCP). Patients with HCPs in lymph nodes had better outcomes than patients without HCPs in lymph node. A significant prognostic difference between the patients with HCPs and without HCPs was observed in a subgroup of patients with nodal metastasis.
Answer: Our findings suggest that HCP might reflect a degenerative change of cancer cells in lymph nodes and can predict the response to neoadjuvant therapy.
answer:

Is intranodal cytokeratin particles a predictive marker of efficacy for neoadjuvant therapies in patients with squamous cell carcinoma of the esophagus?