Phenotyping Superagers Using Resting-State fMRI.

BACKGROUND AND PURPOSE: Superagers are defined as older adults with episodic memory performance similar or superior to that in middle-aged adults. This study aimed to investigate the key differences in discriminative networks and their main nodes between superagers and cognitively average elderly controls. In addition, we sought to explore differences in sensitivity in detecting these functional activities across the networks at 3T and 7T MR imaging fields. MATERIALS AND METHODS: Fifty-five subjects 80 years of age or older were screened using a detailed neuropsychological protocol, and 31 participants, comprising 14 superagers and 17 cognitively average elderly controls, were included for analysis. Participants underwent resting-state-fMRI at 3T and 7T MR imaging. A prediction classification algorithm using a penalized regression model on the measurements of the network was used to calculate the probabilities of a healthy older adult being a superager. Additionally, ORs quantified the influence of each node across preselected networks. RESULTS: The key networks that differentiated superagers and elderly controls were the default mode, salience, and language networks. The most discriminative nodes (ORs > 1) in superagers encompassed areas in the precuneus posterior cingulate cortex, prefrontal cortex, temporoparietal junction, temporal pole, extrastriate superior cortex, and insula. The prediction classification model for being a superager showed better performance using the 7T compared with 3T resting-state-fMRI data set. CONCLUSIONS: Our findings suggest that the functional connectivity in the default mode, salience, and language networks can provide potential imaging biomarkers for predicting superagers. The 7T field holds promise for the most appropriate study setting to accurately detect the functional connectivity patterns in superagers.

[High Frequency of Mesenteric Panniculitis in Non-Hodgkin Lymphoma and Prostate Cancer: Study in 1,500 Oncologic Patients Undergoing Staging]. / Alta frecuencia de paniculitis mesentérica en linfoma no Hodgkin y cáncer de próstata. Estudio en 1.500 pacientes oncológicos en estadificación.

Mesenteric panniculitis (MP) is an uncommon, benign, condition that involves the mesenteric root. It may be idiopathic, or be associated with an inflammatory or malignant neoplasm. AIM: To establish the frequency of MP in oncologic patients according to the type of cancer. METHOD: Images of PET/CT performed between January 2008 and December 2019 on recently diagnosed oncologic patients were reviewed searching for MP. MP was defined as increased density and volume of mesenteric root fat, associated with nodules and/or lymph nodes, with or without pseudocapsule. Patients who had received previous cancer treatment or those with synchronous or metachronous malignancies were excluded. RESULTS: The frequency of MP in the total oncologic population was 5,3 % (82/1539). Types of cancer frequently associated with MP were non-Hodgkin lymphoma at 15,9% (31/195) and prostate cancer at 11,9% (16/134), both significantly higher than the rest of the malignancies (p < 0,01). Hodgkin Lymphoma (0/59), carcinoma of the cervix (0/45), and endometrial cancer (0/44) did not show MP. CONCLUSION: MP is more frequently associated with some malignant neoplasms, such as non-Hodgkin lymphoma and prostate cancer, and rare in others. This must be considered when studying patients with MP detected incidentally.

The Brain Metabolic Signature in Superagers Using In Vivo 1H-MRS: A Pilot Study.

BACKGROUND AND PURPOSE: Youthful memory performance in older adults may reflect an underlying resilience to the conventional pathways of aging. Subjects having this unusual characteristic have been recently termed "superagers." This study aimed to explore the significance of imaging biomarkers acquired by 1H-MRS to characterize superagers and to differentiate them from their normal-aging peers. MATERIALS AND METHODS: Fifty-five patients older than 80 years of age were screened using a detailed neuropsychological protocol, and 25 participants, comprising 12 superagers and 13 age-matched controls, were statistically analyzed. We used state-of-the-art 3T 1H-MR spectroscopy to quantify 18 neurochemicals in the posterior cingulate cortex of our subjects. All 1H-MR spectroscopy data were analyzed using LCModel. Results were further processed using 2 approaches to investigate the technique accuracy: 1) comparison of the average concentration of metabolites estimated with Cramer-Rao lower bounds <20%; and 2) calculation and comparison of the weighted means of metabolites' concentrations. RESULTS: The main finding observed was a higher total N-acetyl aspartate concentration in superagers than in age-matched controls using both approaches (P = .02 and P = .03 for the weighted means), reflecting a positive association of total N-acetyl aspartate with higher cognitive performance. CONCLUSIONS: 1H-MR spectroscopy emerges as a promising technique to unravel neurochemical mechanisms related to cognitive aging in vivo and providing a brain metabolic signature in superagers. This may contribute to monitoring future interventional therapies to avoid or postpone the pathologic processes of aging.

SGLT2 inhibition increases serum copeptin in young adults with type 1 diabetes.

AIMS: Copeptin, a surrogate of vasopressin, is elevated in type 1 diabetes (T1D) and predicts kidney disease and cardiovascular mortality. Given the cardiorenal protective effects of SGLT2 inhibition (SGLT2i), our aim was to examine: 1) the relationship between serum copeptin, metabolic, renal and systemic hemodynamic parameters in adults with T1D; and 2) serum copeptin after SGLT2i with empagliflozin. MATERIALS AND METHODS: In this post-hoc, exploratory analysis, serum copeptin, glomerular filtration rate (GFRInulin), effective renal plasma flow (ERPFPAH), plasma renin angiotensin aldosterone system markers, HbA1c, 24-hour urine volume and sodium excretion were measured in 40 participants with T1D (24.3±5.1 years) during eu- and hyperglycaemia before and after 8 weeks of 25mg of daily empagliflozin. RESULTS: Higher baseline copeptin correlated with higher HbA1c, lower 24-hour urine volume and sodium excretion, after correcting for age, sex, systolic blood pressure, and HbA1c. Copeptin concentrations increased in response to empagliflozin under euglycaemia (4.1±2.1 to 5.1±2.8pmol/L, P=0.0053) and hyperglycaemia (3.3±1.4 to 5.6±2.8pmol/L, P<0.0001). The rise in copeptin in response to empagliflozin correlated with change in 24-hour urine volume, but was independent of changes in fractional excretion of sodium and haematocrit. CONCLUSIONS: Elevated serum copeptin was associated with worse glycaemic control and lower diuresis and natriuresis. SGLT2i increased serum copeptin in adults with T1D, and the rise correlated with change in diuresis, but not natriuresis and hemo-concentration. Further work is required to evaluate the clinical implications of elevated copeptin with SGLT2i, including whether it is simply a marker of diuresis or may contribute to cardiorenal disease long-term.

Response Assessment in Neuro-Oncology Criteria for Gliomas: Practical Approach Using Conventional and Advanced Techniques.

The Response Assessment in Neuro-Oncology criteria were developed as an objective tool for radiologic assessment of treatment response in high-grade gliomas. Imaging plays a critical role in the management of the patient with glioma, from initial diagnosis to posttreatment follow-up, which can be particularly challenging for radiologists. Interpreting findings after surgery, radiation, and chemotherapy requires profound knowledge about the tumor biology, as well as the peculiar changes expected to ensue as a consequence of each treatment technique. In this article, we discuss the imaging findings associated with tumor progression, tumor response, pseudoprogression, and pseudoresponse according to the Response Assessment in Neuro-Oncology criteria for high-grade and lower-grade gliomas. We describe relevant practical issues when evaluating patients with glioma, such as the need for imaging in the first 48 hours, the radiation therapy planning and isodose curves, the significance of T2/FLAIR hyperintense lesions, the impact of the timing for the evaluation after radiation therapy, and the definition of progressive disease on the histologic specimen. We also illustrate the correlation among the findings on conventional MR imaging with advanced techniques, such as perfusion, diffusion-weighted imaging, spectroscopy, and amino acid PET. Because many of the new lesions represent a mixture of tumor cells and tissue with radiation injury, the radiologist aims to identify the predominant component of the lesion and categorize the findings according to Response Assessment in Neuro-Oncology criteria so that the patient can receive the best treatment.

Multinodular and Vacuolating Neuronal Tumor of the Cerebrum: A New "Leave Me Alone" Lesion with a Characteristic Imaging Pattern.

Multinodular and vacuolating neuronal tumor of the cerebrum is a recently reported benign, mixed glial neuronal lesion that is included in the 2016 updated World Health Organization classification of brain neoplasms as a unique cytoarchitectural pattern of gangliocytoma. We report 33 cases of presumed multinodular and vacuolating neuronal tumor of the cerebrum that exhibit a remarkably similar pattern of imaging findings consisting of a subcortical cluster of nodular lesions located on the inner surface of an otherwise normal-appearing cortex, principally within the deep cortical ribbon and superficial subcortical white matter, which is hyperintense on FLAIR. Only 4 of our cases are biopsy-proven because most were asymptomatic and incidentally discovered. The remaining were followed for a minimum of 24 months (mean, 3 years) without interval change. We demonstrate that these are benign, nonaggressive lesions that do not require biopsy in asymptomatic patients and behave more like a malformative process than a true neoplasm.

Molecular characterization of endophytic fungi associated with the roots of Chenopodium quinoa inhabiting the Atacama Desert, Chile.

Plant roots can be highly colonized by fungal endophytes. This seems to be of particular importance for the survival of plants inhabiting stressful habitats. This study focused on the Identification of the fungal endophytic community associated with the roots of quinoa plants (Chenopodium quinoa) growing near the salt lakes of the Atacama Desert, Chile. One hundred endophytic fungi were isolated from healthy quinoa roots, and the internal transcribed spacer (ITS) region was sequenced for phylogenetic and taxonomic analysis. The isolates were classified into eleven genera and 21 distinct operational taxonomic units (OTUs). Despite a relatively high diversity of root endophytic fungi associated with quinoa plants, the fungal community was dominated by only the Ascomycota phyla. In addition, the most abundant genera were Penicillium, Phoma and Fusarium, which are common endophytes reported in plant roots. This study shows that roots of C. quinoa harbor a diverse group of endophytic fungi. Potential roles of these fungi in plant host tolerance to stressful conditions are discussed.

Estudio de la población nacida pequeña para la edad gestacional en tratamiento con hormona del crecimiento / Study of small for gestational age in treatment with growth hormone

Objetivo: El objetivo principal de este estudio es analizar los cambios producidos en la velocidad de crecimiento durante los 2 primeros años de terapia con hormona del crecimiento recombinante humana (rhGH) en niños pequeños para su edad gestacional (PEG), en estadio I de Tanner, atendidos en el servicio de pediatría del hospital de referencia de la provincia de Lleida. Material y métodos: Se han recogido los datos de los pacientes PEG que han seguido tratamiento con rhGH durante al menos 2 años, en estadio I de Tanner al inicio y al final del periodo. Se han utilizado como referencia los datos del estudio español de crecimiento de 2010. Resultados: El número de pacientes que cumplen estos criterios es de 58 (un 45% varones y un 55% mujeres). La media de edad al inicio del tratamiento fue de 8 ± 2,7 años. La velocidad de crecimiento (VC) previa al tratamiento era de 5,2 ± 2,8 cm. En el primer año de tratamiento la VC fue de 8,6 ± 1,9 cm y en el segundo de 7 ± 2,1 cm. El análisis de regresión lineal ajustado por la edad del niño muestra un aumento significativo en la VC después del primer y segundo año respecto al valor inicial pretratamiento, mayor tras el primer año que tras el segundo. La desviación estándar (DE) de la talla previa al tratamiento era de -2,6 ± 0,4 (-2,1 ± 0,5 en el primer año y -1,8 ± 0,6 en el segundo). El análisis de regresión lineal muestra un aumento significativo en la DE después del primer y segundo año respecto al valor inicial pretratamiento, es decir, una aproximación progresiva a los valores normales. La dosis inicial de rhGH fue de 0,035 mg/kg/día. Durante el periodo estudiado no se han producido efectos secundarios que hayan precisado la suspensión del tratamiento en ningún caso. Conclusiones: Los datos incluidos en este estudio demuestran que el tratamiento con rhGH favorece el crecimiento en los niños PEG, observándose su máximo efecto durante el primer año (AU)

Objective: To analyze the changes produced in the growth velocity among small for gestational age (SGA) children in Tanner's first stage, receiving recombinant human growth hormone therapy (rhGH), in the Paediatric Department of Hospital Universitari Arnau de Vilanova, hospital of reference in province of Lleida in northern Spain. Material and methods: Patient information was collected before and after treatment for two years with rhGH. Data from the Spanish growth study of 2010 were used as reference. Results: The number of patients who fulfilled inclusion criteria was 58 (45% male; 55% female). The average age at the beginning of treatment was 8 ± 2.7 years. The growth velocity (GV) prior to treatment was 5.2 ± 2.8 cm per year. In the first year of treatment, the GV increased to 8.6 ± 1.9 cm/yr and in the second year of the study, to 7 ± 2.1 cm/yr. Linear regression analysis adjusted for age showed a significant increase in GV after the first and second year compared to the pretreatment value, with a greater increase in the first year of treatment than in the second. The standard deviation (SD) of size prior to treatment was -2.6 ± 0.4 (-2.1 ± 0.5 in the first year and -1.8 ± 0.6 in the second year). Linear regression analysis showed a significant increase in the SD after the first and second years of treatment compared to the pretreatment value; in other words, a progressive return to normal values was found. The initial dose of rhGH was 0.035 mg/kg/day. During the study period there were no reported adverse effects which necessitated suspension of treatment. Conclusion: The data found in this study show that treatment with rhGH promotes growth in SGA children, producing a maximum effect in the first year of treatment (AU)

Trastorno del comedor compulsivo: Incorporación del concepto en la salud pública chilena / Binge eating disorder: Incorporating the concept in the public health system in Chile

A literature review on Binge Eating Disorder which is a recently recognized as such by the Diagnostic and Statistical Manual of Mental Disorders version V, which identifies it as eating disorder pathology that is characterized by an excessive consumption of food with loss of control and compensation methods, causing the person to have excess weight and simultaneously can lead to obesity associated diseases such as diabetes mellitus and hypertension, among others. There is an abundance of worldwide literature on binge eating disorder, its concept, risk factors, characteristics and possible treatments. In Chile there are no studies or strategies to address this disorder that could be present in our population. The purpose of this update is to promote and address the concept of binge eating disorder in the Chilean public health system.

Se presenta una revisión de la literatura sobre el Trastorno del Comedor Compulsivo (en inglés Binge Eating Disorder) el cual es un patología recientemente reconocida como tal por el Diagnostic and Statistical Manual of Mental Disorders versión V, que lo identifica como trastorno alimentario, que se caracteriza por el consumo excesivo de alimentos (atracones) con pérdida del control y sin métodos compensatorios, que genera que la persona que lo padece tenga una malnutrición por exceso y a la vez puede acarrear patologías asociadas a la obesidad como: diabetes mellitus, hipertensión arterial, enfermedades osteomusculares, entre otros. Existe gran cantidad de literatura a nivel mundial sobre el trastorno del comedor compulsivo abordando concepto, factores de riesgos, características e incluso posibles tratamientos, sin embargo en Chile no existen estudios o estrategias para abordar este trastorno que podría estar presente en nuestra población. El objetivo de esta actualización es incentivar y abordar el concepto del trastorno del comedor compulsivo en la salud pública chilena.

Hepatitis aloinmune fetal / Fetal alloimmune hepatitis

La hepatitis aloinmune fetal, conocida anteriormente como hemocromatosis neonatal, ha demostrado en los últimos años ser una enfermedad completamente distinta a la hemocromatosis del adulto, tanto en su etiología como en su la fisiopatología. Este conocimiento abre nuevas perspectivas tanto en la prevención de la enfermedad en futuros embarazos, así como en el tratamiento con inmunoglobulina endovenosa en la madre durante el embarazo y eventualmente el tratamiento postnatal, en el que el trasplante de hígado juega un rol primordial.

Fetal alloimmune hepatitis, until few years ago was known as neonatal hemochromatosis, has shown to be a completely different disease from hemochromatosis in the adult, in its etiology and pathophysiology. This knowledge opens up opportunities of counselling in future pregnancies as well as in the treatment with intravenous immunoglobulin to the mother during pregnancy, and eventually the postnatal treatment, in which liver transplantation plays a primary role.

Comparison of the behaviour of Brettanomyces bruxellensis strain LAMAP L2480 growing in authentic and synthetic wines.

Brettanomyces bruxellensis is the main microorganism responsible for the production of off-flavours in wine. Studies have been carried out in synthetic cultures using p-coumaric acid for the production of vinyl and ethylphenols. The results obtained have been extrapolated to authentic wine, but there is no evidence that this correlation will be correct. We studied the behaviour of B. bruxellensis native strain LAMAP L2480 in authentic wine and in a synthetic medium with a chemical composition similar to the authentic wine used in this study (basal synthetic wine + pH, ethanol and hydroxycinnamic acid concentrations of commercial wine). In some assays, B. bruxellensis has been studied using media containing 100 mg L(-1) p-coumaric acid, so we also used the same concentration added to the authentic and synthetic wines. The microorganism showed better growth in authentic wine, regardless of the presence of p-coumaric acid. In the case of synthetic wine, the addition of p-coumaric acid caused a delay in yeast growth and an increase in the production of volatile phenols. The coumarate decarboxylase activity did not show any difference regardless of the media and the presence of p-coumaric acid. Vinylphenol reductase showed higher activity when a higher concentration of p-coumaric acid was added in synthetic wine, but no change was observed in authentic wine.

GERMPLASM BANKING AND ITS ROLE IN THE DEVELOPMENT OF THE FISH GENETIC IMPROVEMENT PROGRAMME IN BRAZIL.

BACKGROUND: Over the last ten years, Brazilian fish farming has become more focused, resulting in the development of genetic improvement programmes (GIP) for two South American species Colossoma macropomum (tambaqui) and Pseudoplatystoma reticulatum (cachara). OBJECTIVE: To describe the action plan used for setting up the GIP and to detail the germplasm bank composition. MATERIALS AND METHODS: Semen of both species was collected, frozen and transported between locations in Brazil. To start the programme, full and half-sib families of both species were established from 120 males and 60 females. RESULTS: New species-specific protocols for semen cryopreservation s were established of value to commercial application in fish farming. CONCLUSION: Germplasm banking has enabled the exchange of biological material and reduced the overall GIP costs. Germplasm banking can be very important to the dissemination of the selected genetic material of these species among fish farmers.

Clinicopathological characterization of primary oral and sinonasal melanoma in a referral centre in Mexico City: 2000-2012.

In Mexico, there have been few studies on primary oral and sinonasal melanoma, an aggressive neoplasm with a low survival rate and few therapeutic alternatives. Further, there is limited information about its clinical and histopathological characteristics. The aim of this retrospective study was to describe the clinicopathological profile of these tumours in patients attending a major oncology reference centre in Mexico City over a 12-year period. Demographic and clinical data were obtained from the clinical charts, and histopathological features were evaluated. χ(2), Fisher's exact, and Mann-Whitney U-tests were used for analysis; significance was set at P<0.05. Thirty-three cases were studied (73% sinonasal melanoma (SNM) and 27% oral melanoma (OM)); 58% were female and the median age was 66 (Q1-Q3 55.5-75) years. Compared with OM patients, SNM patients had a shorter time to diagnosis (16.7 vs. 11.7 months, P=0.022), were identified at earlier stages (33.3% vs. 58.3%, P=0.010), and all presented symptoms (66.7% vs. 100%, P=0.015). All samples showed vertical growth and 96.9% exhibited pleomorphism. A higher proportion of cases with pleomorphism developed metastases at follow-up than those without (60% vs. 12.5%, P=0.026). The present study provides valuable information that could form the basis of future studies in the search for advanced therapy modalities.

Sintomatologia de depresión, ansiedad y baja autoestima en mujeres obesas con trastorno del comedor compulsivo / Symptoms of depression, anxiety and low self-esteem in women with obesity and binge eating disorder

The objective of this study was to determine the presence of symptoms of depression, anxiety and low self-esteem in women with obesity and binge eating disorder. 60 women using the primary health care system in Lautaro were selected. Within the inclusion criteria were identified diagnosis of nutritional obesity and the presence of binge eating disorder without medical and mental disorders. Depression Scale Anxiety of Goldberg and Rosenberg Self-Esteem Scale were applied individually. For descriptive analysis results were used, through a frequency distribution and chi² test. Among the findings it was noted that this group had mostly symptoms of depression and anxiety, which correlates with the literature. However, low self-esteem, which contrasts with the evidence examined, was not observed. This study shows that obesity is not just a simple symptom, but there are psychopathological backgrounds like depression and anxiety to consider, which should be incorporated into the comprehensive diagnosis in its primary health care plan for later multidisciplinary intervention.

El objetivo de este estudio fue determinar la presencia de sintomatología de depresión, ansiedad y baja autoestima en mujeres con obesidad y trastorno del comedor compulsivo. Se seleccionaron a 60 mujeres usuarias del sistema de atención primaria de salud de la comuna de Lautaro. Dentro de los criterios de inclusión se determinaron: diagnóstico nutricional de obesidad, sin patologías médicas y mentales diagnosticadas y la presencia del Trastorno del Comedor Compulsivo. Se les aplicaron aplicaron de manera individual la Escala de Depresión y de Ansiedad de Goldberg y la Escala de Autoestima de Rosenberg. Para los resultados se utilizó un análisis descriptivo, a través de una distribución de frecuencias y una prueba de chi². Se observó que este grupo mayoritariamente si presentaba sintomatología de depresión y ansiedad, que se correlaciona con la literatura. Sin embargo, no se observó una baja autoestima, que se contrapone con los antecedentes analizados. Este estudio, nos muestra que la obesidad no es tan sólo un síntoma aislado, sino que existen antecedentes psicopatológicos a considerar: como depresión y ansiedad, el cual se debería incorporar dentro del diagnóstico integral en el equipo de atención primaria de salud para un posterior plan de intervención multidisciplinario.

Efectos de la yerba mate (Ilex paraguariensis) en los niveles plasmáticos de glucosa, lípidos, urea y creatinina de ratas Wistar / Effects of yerba mate (Ilex paraguariensis) in the plasma levels of glucose, lipids, urea and creatinine of Wistar rats

INTRODUCCIÓN: La yerba mate (Ilex paraguariensis) es un vegetal nativo de las regiones subtropicales de Sudamérica utilizada en la preparación de infusiones que se beben en ciertos países de la región. El objetivo del estudio fue determinar los efectos de extractos acuosos de Ilex paraguariensis en los niveles plasmáticos de glucosa, lípidos, urea y creatinina en ratas Wistar. MATERIALES Y MÉTODO: Estudio experimental. Se distribuyeron al azar 20 ratas Wistar en 2 grupos de 10 animales cada uno; el grupo control recibió como bebida agua y el grupo expuesto a yerba recibió como bebida una infusión de Ilex paraguariensis. El periodo de experimentación fue de 60 días, a cuyo término se determinaron las concentraciones plasmáticas de glucosa, colesterol, triglicéridos, urea y creatinina. Las medias de los parámetros fueron comparadas por la prueba U de Mann-Whitney, considerándose significativas las diferencias con p<0,05. RESULTADOS: El consumo de yerba mate disminuyó los niveles de glicemia en el grupo expuesto en comparación con el grupo control, siendo la diferencia altamente significativa (p<0,001). Se observaron niveles significativamente mayores de urea (p=0,04) y creatinina (p=0,02)en el grupo expuesto en comparación con el grupo control. No hubo diferencias significativas entre los niveles de colesterol y triglicéridos entre ambos grupos. DISCUSIÓN: Los resultados sugieren que el consumo de Ilex paraguariensis reduce los niveles plasmáticos de glucosa y podrían poseer un efecto nocivo en la función renal.

INTRODUCTION: yerba mate (Ilex paraguariensis) is a plant species native to subtropical regions of South America and is used to make tea in local countries. The aim of the study was to determine the effects of aqueous extracts of Ilex paraguariensis in plasmatic levels of glucose, lipids, urea and creatinine in Wistar rats. MATERIALS AND METHODS: Experimental study. 20 Wistar rats were randomized in two groups of ten animals each: control group received water while the exposed group received an infusion of Ilex paraguariensis. After 60 days of experiment, plasmatic concentrations of glucose, cholesterol, triglycerides,urea and creatinine were determined. Mann- Whitney U test was used to compare means, differences were considered statistically significant atp <0.05. RESULTS: Blood glucose levels were lower in the exposed group compared with the control group(p <0.001).Plasmatic levels of urea and creatinine were signiticantly higher in the exposed group (p=0.04 and p=0.02 respectively). No significant differences were observed in the levels of cholesterol and triglycerides among the groups. DISCUSSION: The results suggest that consumption of Ilex paraguariensis reduces plasma glucose levels and could have an adverse effect on renal function.

Immunoexpression of matrix metalloproteinases and their inhibitors in different areas of oral squamous cell carcinoma.

BACKGROUND: Several studies have shown the participation of MMPs in oral squamous cell carcinoma, the most frequent malignant neoplasm of the oral cavity. The expression of some MMPs correlates with a more aggressive biological behaviour. The objective of this study was to determine which MMPs and TIMPs were expressed in both neoplastic and peritumoural stromal cells in different histopathology areas. METHODS: Patients who underwent primary tumour neck dissection for oral squamous cell carcinoma were included. Immunoexpression of MMP-1, -2, -3, -7, -9, -11, -13, and TIMP-1 and -2 in different areas of pathologic specimens (in situ carcinoma, primary tumour, invasive front, distant invasion carcinoma, and lymph node metastasis) was evaluated. Enzyme expression on mucosa adjacent to tumour served as control. RESULTS: Thirty cases were included. Only 6 MMPs and 1 TIMP were expressed in the studied areas. Statistically significant differences in the number of cases with positive MMPs or TIMP expression, in both neoplastic and peritumoural cells, between control and the rest of the areas were observed. MMP-2 expression was constant in the areas with a more aggressive biological behaviour. CONCLUSIONS: MMP-2 expression may represent a dynamic interaction between host and tumour that favours the establishment of neoplastic cells at distant sites.

Increasing storage capability of pacu (Piaractus mesopotamicus) embryos by chilling: development of a useful methodology for hatcheries management.

Cryopreservation of fish gametes has been studied extensively in the last few decades, but the successful cryopreservation of fish embryos remains elusive. However, recent studies using short-term chilling techniques have shown that it is possible to store embryos at low temperatures with no significant loss in viability. Information on cryopreservation of Neotropical freshwater fish embryos has so far been very limited in the literature. In the present study, chilling protocols for storage of pacu embryos at -8°C for up to 24 h were studied using different concentrations of sucrose in methanol. Embryos tolerated the subzero temperature for up to 6 h with no adverse effects (P > 0.05). After 12 h chilling, hatching rate of 64.0 +/- 3.5 percent was recorded. Low temperature storage of pacu embryos by chilling is detailed here for the first time. Further studies are needed to extend the storage time and to improve the hatching rate.

PPARγ expression is increased in systemic lupus erythematosus patients and represses CD40/CD40L signaling pathway.

Systemic lupus erythematosus (SLE) is a heterogeneous disease involving several immune cell types and pro-inflammatory signals, including the one triggered by binding of CD40L to the receptor CD40. Peroxisome-proliferator activated receptor gamma (PPARγ) is a transcription factor with anti-inflammatory properties. Here we investigated whether CD40 and PPARγ could exert opposite effects in the immune response and the possible implications for SLE. Increased PPARγ mRNA levels were detected by real-time PCR in patients with active SLE, compared to patients with inactive SLE PPARγ/GAPDH mRNA = 2.21 ± 0.49 vs. 0.57 ± 0.14, respectively (p < 0.05) or patients with infectious diseases and healthy subjects (p < 0.05). This finding was independent of the corticosteroid therapy. We further explored these observations in human THP1 and in SLE patient-derived macrophages, where activation of CD40 by CD40L promoted augmented PPARγ gene transcription compared to non-stimulated cells (PPARγ/GAPDH mRNA = 1.14 ± 0.38 vs. 0.14 ± 0.01, respectively; p < 0.05). This phenomenon occurred specifically upon CD40 activation, since lipopolysaccharide treatment did not induce a similar response. In addition, increased activity of PPARγ was also detected after CD40 activation, since higher PPARγ-dependent transcription of CD36 transcription was observed. Furthermore, CD40L-stimulated transcription of CD80 gene was elevated in cells treated with PPARγ-specific small interfering RNA (small interfering RNA, siRNA) compared to cells treated with CD40L alone (CD80/GAPDH mRNA = 0.11 ± 0.04 vs. 0.05 ± 0.02, respectively; p < 0.05), suggesting a regulatory role for PPARγ on the CD40/CD40L pathway. Altogether, our findings outline a novel mechanism through which PPARγ regulates the inflammatory signal initiated by activation of CD40, with important implications for the understanding of immunological mechanisms underlying SLE and the development of new treatment strategies.