Impact of Service-Learning educational interventions on nursing students: An integrative review.

BACKGROUND: Service learning is an innovative educational approach that enables nursing students to directly participate and engage in the community while providing them and the community with benefits. OBJECTIVES: To summarise the evidence from service learning activities for nursing students, the educational and non-educational benefits derived through implementing this methodology, and the participating students' perceptions. DESIGN: An integrative review including qualitative, quantitative, and mixed methods designs was conducted. DATA SOURCES: The articles were identified through a systematic search in the following electronic databases: PubMed, Cochrane Library Plus, Scopus, CINAHL Complete (EBSCOHost), and Education Source (EBSCOHost). REVIEW METHODS: The search for studies was conducted in December 2020 using the following search terms: "Service learning", "Service-learning partnership", "Nursing", "Benefits" and "Intervention". RESULTS: A total of 22 articles were included. A positive relationship was found between the nursing students participating in service learning programmes and the acquisition of educational benefits, such as theoretical and practical learning, communication skills, and teamwork, and non-educational benefits, such as empathy, questioning prejudices, and commitment. In addition, a wide variety of activities and interventions were found to have been implemented using this academic approach, as well as a positive evaluation by the participating students. CONCLUSIONS: Service learning programmes with the active participation of nursing students generate benefits for both them and the community. First, these interventions receive positive evaluations from participating students. Furthermore, the interventions developed using service learning are varied and require motivation and creativity to implement them. However, there is a need for more experimental studies and the use of larger samples in service learning programmes.

Extracellular vesicle-transported Semaphorin3A promotes vascular permeability in glioblastoma.

Glioblastoma are malignant highly vascularized brain tumours, which feature large oedema resulting from tumour-promoted vascular leakage. The pro-permeability factor Semaphorin3A (Sema3A) produced within glioblastoma has been linked to the loss of endothelial barrier integrity. Here, we report that extracellular vesicles (EVs) released by patient-derived glioblastoma cells disrupt the endothelial barrier. EVs expressed Sema3A at their surface, which accounted for in vitro elevation of brain endothelial permeability and in vivo vascular permeability, in both skin and brain vasculature. Blocking Sema3A or its receptor Neuropilin1 (NRP1) hampered EV-mediated permeability. In vivo models using ectopically and orthotopically xenografted mice revealed that Sema3A-containing EVs were efficiently detected in the blood stream. In keeping with this idea, sera from glioblastoma multiforme (GBM) patients also contain high levels of Sema3A carried in the EV fraction that enhanced vascular permeability, in a Sema3A/NRP1-dependent manner. Our results suggest that EV-delivered Sema3A orchestrates loss of barrier integrity in glioblastoma and may be of interest for prognostic purposes.

P38MAPK is a major determinant of the balance between apoptosis and autophagy triggered by 5-fluorouracil: implication in resistance.

5-Fluorouracil (5-FU), together with other drugs such as oxaliplatin, is one of the most important pharmacological agents in the treatment of colorectal cancer. Although mitogen-activated protein kinases (MAPKs) have been extensively connected with resistance to platinum compounds, no role has been established in 5-FU resistance. Here we demonstrate that p38MAPK activation is a key determinant in the cellular response to 5-FU. Thus, inhibition of p38MAPKα by SB203580 compound or by short-hairpin RNA interference-specific knockdown correlates with a decrease in the 5-FU-associated apoptosis and chemical resistance in both HaCaT and HCT116 cells. Activation of p38MAPK by 5-FU was dependent on canonical MAP2K, MAPK kinase (MKK)-3 and MKK6. In addition, ataxia telangiectasia mutated (ATM) and ataxia telangiectasia and Rad3 related (ATR) showed a redundancy of function for the final activation of p38MAPK. Resistance associated with p38MAPK inhibition correlates with an autophagic response that was mediated by a decrease in p53-driven apoptosis, without effect onto p53-dependent autophagy. Moreover, the results with colorectal cancer-derived cell lines with different p53 status and patterns of resistance to 5-FU suggest that de novo and acquired resistance was controlled by similar mechanisms. In summary, our data demonstrate a critical role for the p38MAPK signaling pathway in the cellular response to 5-FU by controlling the balance between apoptosis and autophagy.

Remodeling of VE-cadherin junctions by the human herpes virus 8 G-protein coupled receptor.

Kaposi Sarcoma (KS) are opportunistic tumors, associated with human herpes virus 8 (HHV8) infection. KS development is highly favored by immune-depression and remains the second most frequent tumor in acquired immune deficiency syndrome patients. Although it has been shown that experimental expression of the HHV8 G-protein-coupled receptor (vGPCR) in the endothelial compartment is alone sufficient to recapitulate the formation and progression of KS-like lesions, its functional effects on endothelial homeostasis are not fully understood. Here we show that vGPCR expression in endothelial cells induces an increase in paracellular permeability both in vivo and in vitro. By using pharmacological inhibitors and small interference RNA-based knockdown, we demonstrate an essential role for the PI(3)Kinase-γ/Rac nexus in vGPCR-mediated permeability. This was further accompanied by dramatic remodeling of VE-cadherin-dependent cell-cell junctions. Importantly, this in vitro vGPCR-initiated signaling signature was observed in a large panel of human KS. Altogether, our results support the hypothesis that endothelial vGPCR signaling is co-opted in KS, and unveil new key cellular targets for therapeutic intervention.

PKB/Akt media la radio sensibilidad asociada a Ataxia Telangiectasia / PKB/Akt mediates radiosensitivity associated to ataxia telangiectasia

El gen mutado en el síndrome de Ataxia Telangiectasia está implicado en múltiples funciones celulares queabarcan desde la respuesta al daño genotóxico causado por la radiación ionizante hasta la respuesta a insulina.Curiosamente la ruta de señalización mediada por Akt esta relacionada con los mismos estímulos. En el presenteestudio demostramos como el gen mutado en Ataxia Telangiectasia (ATM) controla la fosforilación deAkt, en respuesta a estímulos como la radiación ionizante o la insulina. Estos datos han sido obtenidos usandomodelos experimentales como células derivadas de enfermos de Ataxia o de ratones nulos para la expresión deATM. Nuestro estudio propone nuevas explicaciones para entender la radio sensibilidad característica de estosenfermos y destaca el papel primordial de Akt en la respuesta a la radiación ionizante

The gene mutated in ataxia telangiectasia (ATM) has been implicated in several functions such as cell cycle, response to DNA damage, and insulin. Curiously, the PKB/Akt-mediated signaling route is related to the same cellular responses. We show in this work that ATM is a major determinant of full PKB/Akt activation in response to insulin or gamma-radiation. This conclusion was inferred from the results obtained in transient transfection assays using exogenous PKB/Akt and ATM in Cos cells, and also in cell lines derived from ataxia telangiectasia patients or KO mice. Our study proposes new clues to understand the radiosensitivity associated to ataxia telangiectasia and supports a critical role for PKB/Akt in the cellular response to ionizing radiation