RESUMO
BACKGROUND: Colon cancer is the third most commonly diagnosed cancer with high morbidity and mortality. Calmodulin-binding transcription activator 2 (CAMTA2) belongs to the calmodulin-binding transcription activator protein family. The functional role of CAMTA2 in colon cancer development remains unclear. Our research found out that CAMTA2 was high-level expressed in colon cancer, and the upregulated CAMTA2 expression was markedly correlated with poor survival. Functional experiments showed that knockdown of CAMTA2 repressed colon cancer cell proliferation/migration in vitro and attenuated proliferation in vivo. In additional, CAMTA2 expression was controlled by miR-28-5p via posttranscriptional regulation and miR-28-5p expression was reversely correlated with CAMTA2 expression in colon cancer. Moreover, enforced miR-28-5p expression downregulated the expression of CAMTA2 significantly and the restoration of CAMTA2 expression abolished the inhibitory effect of miR-28-5p on colon cancer cell proliferation and metastasis. Mechanistically, overexpression of miR-28-5p suppressed Wnt/ß-catenin signaling and the inhibitory could be partly abolished by overexpression of CAMTA2. In summary, our findings reveal that miR-28-5p/CAMTA2 axis plays a critical role in human colon cancer, which might be a promising diagnosis and therapeutic target for colon cancer treatment.
Assuntos
Neoplasias do Colo , MicroRNAs , Humanos , MicroRNAs/genética , MicroRNAs/metabolismo , beta Catenina/genética , beta Catenina/metabolismo , Linhagem Celular Tumoral , Calmodulina/metabolismo , Via de Sinalização Wnt/genética , Neoplasias do Colo/genética , Proliferação de Células/genética , Regulação Neoplásica da Expressão Gênica , Movimento Celular/genética , Proteínas de Ligação ao Cálcio/metabolismo , Transativadores/metabolismoRESUMO
Quantitative evaluation of ecosystem service is a primary premise for rational resources exploitation and sustainable development. Examining ecosystem services flow provides a scientific method to quantity ecosystem services. We built an assessment indicator system based on land cover/land use under the framework of four types of ecosystem services. The types of ecosystem services flow were reclassified. Using entropy theory, disorder degree and developing trend of indicators and urban ecosystem were quantitatively assessed. Beijing was chosen as the study area, and twenty-four indicators were selected for evaluation. The results showed that the entropy value of Beijing urban ecosystem during 2004 to 2015 was 0.794 and the entropy flow was -0.024, suggesting a large disordered degree and near verge of non-health. The system got maximum values for three times, while the mean annual variation of the system entropy value increased gradually in three periods, indicating that human activities had negative effects on urban ecosystem. Entropy flow reached minimum value in 2007, implying the environmental quality was the best in 2007. The determination coefficient for the fitting function of total permanent population in Beijing and urban ecosystem entropy flow was 0.921, indicating that urban ecosystem health was highly correlated with total permanent population.
Assuntos
Conservação dos Recursos Naturais , Ecossistema , Entropia , Pequim , China , Cidades , Monitoramento Ambiental , HumanosRESUMO
Non-timber forest products (NTFPs) include all plant materials other than timber, such as seeds, flowers, fruits, leaves, roots, bark, latex, resins, and other non-wood plant parts. The significant role of NTFPs in improving local people's lives and forest biodiversity conservation has been widely accepted. However, many studies in past decades indicated that NTFPs utilization had various ecological effects on different levels, from plant individual and population to community and forest ecosystem, depending not only on the plant parts extracted and their biological or ecological attributes, but also on the harvest forms. This paper reviewed the research progress about the effects of the utilization of NTFPs from biological and ecological aspects, and discussed some research problems and research priorities.
Assuntos
Conservação dos Recursos Naturais/métodos , Ecossistema , Frutas , Casca de Planta , Meio Ambiente , Sementes , Árvores/crescimento & desenvolvimentoRESUMO
Interleukin-2 (IL-2) plays a central role in T-cell activation, expansion, and homeostasis. The failure of IL-2 biosynthesis may play a critical role in tolerance induction. We tested the effect of IL-2 blockade by short hairpin RNA (shRNA) on regulating acute rejection in rat liver transplantation. To this end, we successfully designed and selected an effective interference plasmid, pIL-2B. The IL-2 mRNA expression level in the pIL-2B group was one-fifth of that in the no transfection group. Lewis to BN orthotopic liver transplant model was used to explore the effect of knockdown IL-2 by shRNA in vivo. Recipients treated with pIL-2-shRNA survived longer (median survival time of 16 d range 7-21 d) than those with empty vector (11; range 5-13) or saline (9; range 5-13) (P<0.05), and was inferior to those with CsA (24; range 13-36, P<0.05). The IL-2-shRNA attenuated acute rejection with decreased apoptosis of hepatocytes and reduced cytokine production of IL-2, tumor necrosis factor-alpha (TNF-alpha), and interferon-gamma (IFN-gamma) in the graft. Our results suggest that IL-2 targeting using RNA interference approach may be of potential interest in organ transplantation.