Bone Marrow Mesenchymal Stem Cells Support Acute Myeloid Leukemia Bioenergetics and Enhance Antioxidant Defense and Escape from Chemotherapy.

Like normal hematopoietic stem cells, leukemic stem cells depend on their bone marrow (BM) microenvironment for survival, but the underlying mechanisms remain largely unknown. We have studied the contribution of nestin+ BM mesenchymal stem cells (BMSCs) to MLL-AF9-driven acute myeloid leukemia (AML) development and chemoresistance in vivo. Unlike bulk stroma, nestin+ BMSC numbers are not reduced in AML, but their function changes to support AML cells, at the expense of non-mutated hematopoietic stem cells (HSCs). Nestin+ cell depletion delays leukemogenesis in primary AML mice and selectively decreases AML, but not normal, cells in chimeric mice. Nestin+ BMSCs support survival and chemotherapy relapse of AML through increased oxidative phosphorylation, tricarboxylic acid (TCA) cycle activity, and glutathione (GSH)-mediated antioxidant defense. Therefore, AML cells co-opt energy sources and antioxidant defense mechanisms from BMSCs to survive chemotherapy.

Definition of a cell surface signature for human cardiac progenitor cells after comprehensive comparative transcriptomic and proteomic characterization.

Adult cardiac progenitor/stem cells (CPC/CSC) are multipotent resident populations involved in cardiac homeostasis and heart repair. Assisted by complementary RNAseq analysis, we defined the fraction of the CPC proteome associable with specific functions by comparison with human bone marrow mesenchymal stem cells (MSC), the reference population for cell therapy, and human dermal fibroblasts (HDF), as a distant reference. Label-free proteomic analysis identified 526 proteins expressed differentially in CPC. iTRAQ analysis confirmed differential expression of a substantial proportion of those proteins in CPC relative to MSC, and systems biology analysis defined a clear overrepresentation of several categories related to enhanced angiogenic potential. The CPC plasma membrane compartment comprised 1,595 proteins, including a minimal signature of 167 proteins preferentially or exclusively expressed by CPC. CDH5 (VE-cadherin),  OX2G (OX-2 membrane glycoprotein; CD200), GPR4 (G protein-coupled receptor 4), CACNG7 (calcium voltage-gated channel auxiliary subunit gamma 7) and F11R (F11 receptor; junctional adhesion molecule A; JAM-A; CD321) were selected for validation. Their differential expression was confirmed both in expanded CPC batches and in early stages of isolation, particularly when compared against cardiac fibroblasts. Among them, GPR4 demonstrated the highest discrimination capacity between all cell lineages analyzed.

Recomendaciones sobre actuaciones a seguir durante la edad fértil, el embarazo, posparto y lactancia en pacientes con enfermedades reumáticas inflamatorias y autoinmunes / Recommendations for the evaluation and management of patients with rheumatic autoimmune and inflammatory diseases during the reproductive age, pregnancy, postpartum and breastfeeding

Objetivo. Desarrollar recomendaciones basadas en la mejor evidencia y experiencia sobre el manejo de pacientes con enfermedades reumáticas inflamatorias y autoinmunes durante la edad fértil, el embarazo, posparto y lactancia. Métodos. Se siguió la metodología de grupos nominales. Se seleccionó un grupo nominal de expertos (12 reumatólogos). Se realizó una actualización de una revisión sistemática de la literatura, una revisión literaria, así como una encuesta a nivel nacional sobre el manejo de estos pacientes. El grupo de expertos se encargó de definir el alcance, usuarios, apartados del manuscrito y posibles recomendaciones. El GA con las recomendaciones se votó siguiendo la metodología Delphi según una escala de 1 (total desacuerdo) a 10 (total acuerdo), definiéndose el acuerdo como una puntuación ≥ 7 por al menos el 70% de los participantes. El NE y GR se clasificaron según el modelo del Center for Evidence Based Medicine de Oxford. El documento completo inicial fue revisado por los expertos y el proyecto estuvo coordinado, en todo momento, por un metodólogo experto. Resultados. Se generaron 14 recomendaciones sobre el periodo preconcepcional (anticoncepción, reproducción asistida), el embarazo (planificación, manejo farmacológico y seguimiento) y lactancia (manejo farmacológico y seguimiento). Incluye recomendaciones específicas sobre situaciones de especial riesgo como el lupus eritematoso sistémico y el síndrome antifosfolípido. Existió acuerdo > 90% con todas las recomendaciones menos en una de ellas. Conclusiones. En los pacientes con enfermedades inflamatorias y autoinmunes estas actuaciones pueden mejorar los resultados y el pronóstico de los mismos (AU)

Objective. To develop recommendations on the evaluation and management of patients with rheumatic autoimmune and inflammatory diseases during the reproductive age, pregnancy, post-partum and breastfeeding based on the best evidence and experience. Methods. Recommendations were generated using nominal group and Delphi techniques. An expert panel of 12 rheumatologists was established. A systematic literature review and a narrative review (websites, clinical guidelines and other relevant documentation) were performed and presented to the panel in its 1st meeting to be discussed and to help define recommendations. A first draft of recommendations was generated and circulated for comments and wording refinement. A national survey analyzing different aspects of this topic was undertaken separately, followed by a Delphi process (2 rounds). Agreement with each recommendation was ranked on a scale of 1 (total disagreement) to 10 (total agreement), and was considered to be achieved if at least 70% voted ≥ 7. The level of evidence and grade of recommendation were assessed using the Oxford Centre for Evidence-based Medicine Levels of Evidence. Results. A total of 14 recommendations were generated for the preconception period (oral and hormonal contraception, reproductive techniques), pregnancy (planning, treatment and follow-up), and breastfeeding (treatment and follow-up). High-risk situations such as lupus or antiphospholipid syndrome were included. A consensus > 90% was reached for all but one recommendation. Conclusions. These recommendations are intended to provide rheumatologists, patients, families and other stakeholders with a consensus on the evaluation and management of patients with autoimmune and inflammatory diseases during the reproductive age, pregnancy, postpartum and breastfeeding (AU)

La homocisteinemia materna como factor asociado al aborto espontáneo / Maternal homocysteinemia as a factor associated with spontaneous abortion

Introducción. Dentro del concepto de «trombofilia» se agrupan una serie de trastornos hereditarios y/o genéticos del sistema coagulativo capaces de aumentar el riesgo de aborto de repetición. La hiperhomocisteinemia, incluida en este grupo, constituye una de las entidades mejor conocidas. Objetivos. Los objetivos del presente estudio son explorar la asociación de la homocisteinemia materna con el aborto espontáneo (repetido o no), establecer la prevalencia de hiperhomocisteinemia entre las pacientes abortadoras y determinar el efecto que la suplementación preconcepcional y prenatal con folatos y vitamina B12 ejerce sobre la homocisteinemia. Material y métodos. Estudio de casos y controles con apareamiento 1:1 por edad y antecedentes de aborto. Se determinó en todas ellas la homocisteinemia en ayunas, así como aquellas variables que podrían modificarla. Resultados y conclusión. La homocisteinemia es significativamente mayor en abortadoras que en controles, aunque la tasa de pacientes hiperhomocisteinémicas en la serie es muy baja. Los datos sugieren un escaso papel terapéutico para los folatos y la vitamina B12 (AU)

Introduction. The concept of "thrombophilia" encompasses a group of genetic and/or inherited disorders of the coagulative system able to increase the risk of recurrent spontaneous abortion. Hyperhomocysteinemia, an entity included in this group, is one of the best known. Objectives. Our objectives were to explore the association between maternal homocysteinemia and spontaneous (recurrent or isolated) abortion, establish the prevalence of hyperhomocysteinemia among patients with abortion, and determine the effect of preconceptional and prenatal supplementation with folate and vitamin B12 on homocysteinemia. Matherial and methods. We performed a case-control study with 1:1 matching based on maternal age and previous abortions. In all participants, fasting homocysteine levels, as well as the factors that could modify them, were determined. Results and conclusions. Homocysteine concentrations were significantly higher in women with abortion than in controls, although the rate of hyperhomocysteinemia in the series was very low. The data do not suggest an important therapeutic role for folates or vitamin B12 in these patients(AU)

Calcium supplementation and kidney stone risk in osteoporosis: a systematic literature review.

OBJECTIVES: This paper aims to examine the risk of nephrolithiasis in patients with osteoporosis and calcium supplementation. METHODS: This work is based on the systematic review of studies retrieved by a sensitive search strategy in Medline and Embase (1991-2010), and the Cochrane Central register of Controlled Trials (CENTRAL) up to 2010. The abstracts of the annual scientific meetings of the American College of Rheumatology (ACR) and the European League Against Rheumatism (EULAR) (2008-2010) were also examined. The selection criteria were the following: patients with osteoporosis, on calcium supplementation alone or associated with other treatments for osteoporosis. We measured the likelihood of developing kidney stones, renal colic, changes in urinary sediment and serum parameters. We selected systematic literature reviews, randomised clinical trials (RCT) and cohort studies. RESULTS: We included 10 studies, 8 RCT and 2 cohort studies of moderate quality. All patients had osteoporosis (>8.000 patients), they were mostly women with a mean age of 50-70 years. Daily calcium doses varied from 120 mg up to 1.500 mg, and treatment duration from 3 days to 3 years. Changes in urinary sediment were found, but in general they were not clinically relevant. No cases of nephrolitiasis were found in more than a half of the included studies. In total there were 3 cases of kidney stone, 2 urinary tract calcifications, 16 cases of nephrolithiasis or urolithiasis, 4 of haematuria and 5 patients reporting kidney pain. CONCLUSIONS: According to our results, calcium supplements in the treatment of osteoporosis alone or in combination with another type of treatment does not significantly increase the risk of nephrolithiasis or renal colic.

Actualización del Documento de Consenso de la Sociedad Española de Reumatología sobre el uso de terapias biológicas en la artritis reumatoide / Update of the Consensus Statement of the Spanish Society of Rheumatology on the management of biologic therapies in rheumatoid arthritis

Objetivo Servir de referencia para reumatólogos e implicados en el tratamiento de la artritis reumatoide que vayan a utilizar o consideren la utilización de terapias biológicas en su manejo. Métodos Las recomendaciones se emitieron siguiendo la metodología de grupos nominales y basadas en revisiones sistemáticas. El nivel de evidencia y el grado de recomendación se clasificaron según el modelo del Center for Evidence Based Medicine de Oxford y el grado de acuerdo se extrajo por técnica Delphi. Resultados Se realizan recomendaciones sobre el uso de los siete agentes biológicos disponibles para la artritis reumatoide en la actualidad en nuestro país. El objetivo del tratamiento es lograr la remisión de la enfermedad lo más precozmente posible. Se revisan las indicaciones y matizaciones del uso de terapias biológicas y cuál debe ser la evaluación previa y la vigilancia del paciente con estos fármacos. Conclusiones Se presentan las actualizaciones a las recomendaciones SER para el uso de terapias biológicas en pacientes con artritis reumatoide(AU)

Objective To provide a reference to rheumatologists and to those involved in the treatment of RA who are using, or about to use biologic therapy. Methods Recommendations were developed following a nominal group methodology and based on systematic reviews. The level of evidence and grade of recommendation were classified according to the model proposed by the Center for Evidence Based Medicine at Oxford. The level of agreement was established through Delphi technique. Results We have produced recommendations on the use of the seven biologic agents available for RA in our country. The objective of treatment is to achieve the remission of the disease as quickly as possible. Indications and nuances regarding the use of biologic therapy were reviewed as well as the evaluation that should be performed prior to administration and the follow up of patients undergoing this therapy. Conclusions We present an update on the SER recommendations for the use of biologic therapy in patients with RA(AU)

Proteomic analysis of phytopathogenic fungus Botrytis cinerea as a potential tool for identifying pathogenicity factors, therapeutic targets and for basic research.

Botrytis cinerea is a phytopathogenic fungus causing disease in a substantial number of economically important crops. In an attempt to identify putative fungal virulence factors, the two-dimensional gel electrophoresis (2-DE) protein profile from two B. cinerea strains differing in virulence and toxin production were compared. Protein extracts from fungal mycelium obtained by tissue homogenization were analyzed. The mycelial 2-DE protein profile revealed the existence of qualitative and quantitative differences between the analyzed strains. The lack of genomic data from B. cinerea required the use of peptide fragmentation data from MALDI-TOF/TOF and ESI ion trap for protein identification, resulting in the identification of 27 protein spots. A significant number of spots were identified as malate dehydrogenase (MDH) and glyceraldehyde-3-phosphate dehydrogenase (GAPDH). The different expression patterns revealed by some of the identified proteins could be ascribed to differences in virulence between strains. Our results indicate that proteomic analysis are becoming an important tool to be used as a starting point for identifying new pathogenicity factors, therapeutic targets and for basic research on this plant pathogen in the postgenomic era.

Transfusión autóloga. Sistema de Baylor / Baylor system autologous transfusions

Se efectúa un recorrido histórico hasta llegar al momento en que comienza a utilizarse la propia sangre para transfundir. Se analizan los diferentes tipos de transfusión autóloga, para pasar a detallar específicamente el sistema de transfusión autóloga rápida de Baylor. Se describen sus aplicaciones clínicas y las ventajas que presenta en cuanto a recuperación intraoperatoria, en disminución de riesgos de transmisión de infecciones y la mejor aceptación del paciente (AU)