Despite the development of new glioma therapies that allow for tumor-targeted in situ delivery of cytotoxic drugs, tumor resistance to apoptosis remains a key impediment to effective treatment. Mounting evidence indicates that microRNAs (miRNA) might play a fundamental role in tumorigenesis, controlling cell proliferation and apoptosis. In gliomas, microRNA-21 (miR-21) levels have been reported to be elevated and their knockdown is associated with increased apoptotic activity. We hypothesized that suppression of miR-21 might sensitize gliomas for cytotoxic tumor therapy. With the use of locked nucleic acid (LNA)-antimiR-21 oligonucleotides, bimodal imaging vectors, and neural precursor cells (NPC) expressing a secretable variant of the cytotoxic agent tumor necrosis factor-related apoptosis inducing ligand (S-TRAIL), we show that the combined suppression of miR-21 and NPC-S-TRAIL leads to a synergistic increase in caspase activity and significantly decreased cell viability in human glioma cells in vitro. This phenomenon persists in vivo, as we observed complete eradication of LNA-antimiR-21-treated gliomas subjected to the presence of NPC-S-TRAIL in the murine brain. Our results reveal the efficacy of miR-21 antagonism in murine glioma models and implicate miR-21 as a target for therapeutic intervention. Furthermore, our findings provide the basis for developing combination therapies using miRNA modulation and cytotoxic tumor therapies.
Objetivo. Atualizar o mapa de evidências sobre os efeitos de intervenções para reabilitação de covid-19 pós-aguda. Métodos. O escopo da busca foi definido conforme a população (pacientes que tiveram covid-19 sintomática e sequelas da doença pós-aguda), o contexto (intervenções para recuperação das sequelas) e o tipo de estudo (revisão sistemática, revisão sistemática rápida, revisão de escopo ou revisão de revisões). Após a busca na PubMed e na Biblioteca Virtual em Saúde, dois autores independentes selecionaram estudos de revisão. A atualização do mapa feita em 27 de julho de 2022 seguiu os mesmos procedimentos descritos anteriormente. Resultados. O mapa inicial de evidências continha 22 estudos (quatro revisões sistemáticas, quatro revisões rápidas, quatro revisões de estudos de caso, uma revisão de escopo e nove protocolos de revisão sistemática). Nesta atualização, outros 10 estudos foram incluídos. Foram identificados quatro grupos de intervenções (multimodal, terapêutica, terapias complementares e farmacológica) e sete grupos de desfechos (condições patológicas, doenças/transtornos respiratórios, dor, indicadores fisiológicos e metabólicos, saúde mental/qualidade de vida, funções sensoriais, mortalidade), totalizando 166 associações entre intervenções e desfechos. As terapias complementares tiveram mais associações com os desfechos (n = 94). Entre os desfechos, destacaram-se os indicadores fisiológicos e metabólicos, as condições patológicas e a saúde mental/qualidade de vida (44, 41 e 35 associações, respectivamente). Conclusões. Na atualização do mapa, analisaram-se 69 associações, com destaque para exercício (isolado, multicomponente ou intervenção multimodal, apresentando 23 efeitos positivos e quatro potencialmente positivos) e intervenções farmacológicas e terapias complementares para funções sensoriais (15 associações). O alto número de protocolos indica que a literatura permanece incipiente.
Prostate cancer remains a health problem for men. Targeting androgen (AR) and estrogen (ER) receptors improves the outcomes of the disease, and many medicinal plants exert their effects by modulating these pathways. Therefore, a systematic review was conducted to identify medicinal plants and their natural compounds that may modulate the AR and/or ER pathways in cell and animal models. A search was conducted across EMBASE, LILACS, PubMed, Scopus, and Web of Science, with grey literature from Google SCHOLAR and ProQuest. Two authors independently selected eligible studies based on their titles and abstracts, and a third author resolved conflicts. Then, data from the full text of eligible studies were extracted and synthesized.In total, 75 studies were included. Results showed the effects of several different medicinal plants and natural compounds in reduction of AR and/or ER transcription and translation and AR secondary effects: cell growth reduction, induction of apoptosis, and cell cycle arrest. In animal models, tumor size reduction, increase in apoptosis, and downregulation of AR expression in tumors were also observed. No single phytochemical group concentrating molecules with anti-AR and/or ER activity was identified. Nevertheless, several phytochemical compounds showed potential for future clinical studies in the management of the disease.
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