Browsing by Author "Gonzalez, Carolina"

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    Dispositional Mindfulness Reduces Burnout and Promotes Flourishing in Medical Students: a Two-Wave Latent Change Score Model
    (2022) Zuniga, Denisse; Torres-Sahli, Manuel; Rigotti, Attilio; Pedrals, Nuria; Echeverria, Guadalupe; Padilla, Oslando; Lagos, Alejandra; McColl, Peter; Trucco, Olivia; Cisternas, Marcela; Gonzalez, Carolina; Bogado, Justo; Moraga, Ana Maria; Altamirano, Patricio; Duran, Esperanza; Mansilla, Marcela; Berrios, Carolina; Epstein, Ronald; Bitran, Marcela
    Objectives Many studies document the high prevalence of burnout among medical students. This syndrome may lead to depression, suicidal ideation, and increased academic dropout. However, there is a scarcity of evidence-based interventions to prevent it. The aim of this longitudinal study was to identify factors that may reduce students' burnout and foster their well-being, and upon which effective interventions can be developed. Methods A total of 1,117 medical students from eight Chilean universities were asked to complete a set of validated scales in 2015 and 2 years later, in 2017. The measures included distress, burnout, positive mental health, academic engagement, and dispositional mindfulness. Using logistic regressions and a two-wave latent change score model, the predictive power of these variables on burnout and flourishing (an optimal state of mental health) was studied, as well as their covariance across time. Results In total, 639 (57.2%) students answered the questionnaires in T1 and T2; 54.4% reported burnout in T1 and 56.2% in T2. Levels of dispositional mindfulness (the ability to pay attention to one's sensations, thoughts, and emotions in everyday life) predicted lower probabilities of burning out at 2 years, whereas having experienced burnout in T1 doubled these odds. Dispositional mindfulness, academic engagement, and flourishing at T1 predicted greater odds of flourishing 2 years later, while depression decreased these odds. Conclusions Dispositional mindfulness was the most powerful predictive factor of students' burnout and flourishing. As dispositional mindfulness can be nurtured through practice, incorporating mindfulness training into undergraduate medical programs may help reduce burnout and promote students' well-being as health professionals.
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    Functional Interaction between Human Papillomavirus Type 16 E6 and E7 Oncoproteins and Cigarette Smoke Components in Lung Epithelial Cells
    (PUBLIC LIBRARY SCIENCE, 2012) Pablo Munoz, Juan; Gonzalez, Carolina; Parra, Barbara; Corvalan, Alejandro H.; Tornesello, Maria Lina; Eizuru, Yoshito; Aguayo, Francisco
    The smoking habit is the most important, but not a sufficient cause for lung cancer development. Several studies have reported the human papillomavirus type 16 (HPV16) presence and E6 and E7 transcripts expression in lung carcinoma cases from different geographical regions. The possible interaction between HPV infection and smoke carcinogens, however, remains unclear. In this study we address a potential cooperation between tobacco smoke and HPV16 E6 and E7 oncoproteins for alterations in proliferative and tumorigenic properties of lung epithelial cells. A549 (alveolar, tumoral) and BEAS-2B (bronchial, non-tumoral) cell lines were stably transfected with recombinant pLXSN vectors expressing HPV16 E6 and E7 oncoproteins and exposed to cigarette smoke condensate (CSC) at different concentrations. HPV16 E6 and E7 expression was associated with loss of p53 stability, telomerase (hTERT) and p16(INK4A) overexpression in BEAS-2B cells as demonstrated by quantitative real-time polymerase chain reaction (qRT-PCR) and western blotting (WB). In A549 cells we observed downregulation of p53 but not a significant increase of hTERT transcripts. In addition, the HPV16 E6/E7 transfected cell lines showed an increased proliferation rate and anchorage-independent growth in a HPV16 E6 and E7 expression-dependent manner. Moreover, both HPV16 E6/E7 and mock transfected cells showed an increased proliferation rate and anchorage-independent growth in the presence of 0.1 and 10 mu g/mL CSC. However, this increase was significantly greater in HPV16 E6/E7 transfected cells (p<0.001). Data were confirmed by FCSE proliferation assay. The results obtained in this study are suggestive of a functional interaction between tobacco smoke and HPV16 E6/E7 oncoproteins for malignant transformation and tumorigenesis of lung epithelial cells. More studies are warranted in order to dissect the molecular mechanisms involved in this cooperation.
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    Merkel cell polyomavirus in non-small cell lung carcinomas from Chile
    (ACADEMIC PRESS INC ELSEVIER SCIENCE, 2012) Gheit, Tarik; Pablo Munoz, Juan; Levican, Jorge; Gonzalez, Carolina; Ampuero, Sandra; Parra, Barbara; Gaggero, Aldo; Corvalan, Alejandro H.; Meneses, Manuel; Tommasino, Massimo; Aguayo, Francisco
    Lung cancer is a leading pathology strongly associated with the smoking habit. However, a viral etiology for a subset of patients developing lung cancer has been suggested. Polyomaviruses (PyVs) are small double stranded DNA viruses associated with the development of some human diseases. However, a causal role of these viruses in human cancer has been difficult to demonstrate. In this study, eighty-six non-small cell lung carcinomas (NSCLCs), including adenocarcinomas (AdCs) and squamous cell lung carcinomas (SQCs) from Chile were analyzed for the presence of PyVs using polymerase chain reaction (PCR). All of the specimens were positive for a fragment of the betaglobin gene. We found that 4/86 (4.7%) of lung carcinomas were positive for PyVs. After sequencing and BlastN alignment, all four cases were identified as Merkel cell polyomaviruses (MCV) that corresponded to two AdCs and two SQCs. A non-significant statistical association was found between the presence of MCV and clinic-pathological features of the patients and tumors. In addition, 1/4 (25%) of the carcinomas were actively expressing large T antigen (LT) transcripts, as demonstrated by reverse-transcriptase PCR (RT-PCR). Thus a possible role of MCV in a very small subset of patients with lung cancer cannot be ruled out and warrants more investigation. (C) 2012 Elsevier Inc. All rights reserved.