Cancer microenvironment and endoplasmic reticulum stress response

Different stressful conditions such as hypoxia, nutrient deprivation, pH changes, or reduced vascularization, potentially able to act as growth-limiting factors for tumor cells, activate the unfolded protein response (UPR). UPR is therefore involved in tumor growth and adaptation to severe environments and is generally cytoprotective in cancer. The present review describes the molecular mechanisms underlying UPR and able to promote survival and proliferation in cancer. The critical role of UPR activation in tumor growth promotion is discussed in detail for a few paradigmatic tumors such as prostate cancer and melanoma

Lipid storage and autophagy in melanoma cancer cells

Cancer stem cells (CSC) represent a key cellular subpopulation controlling biological features such as cancer progression in all cancer types. By using melanospheres established from human melanoma patients, we compared less differentiated melanosphere-derived CSC to differentiating melanosphere-derived cells. Increased lipid uptake was found in melanosphere-derived CSC vs. differentiating melanosphere-derived cells, paralleled by strong expression of lipogenic factors Sterol Regulatory Element-Binding Protein-1 (SREBP-1) and Peroxisome Proliferator-Activated Receptor-γ (PPAR-γ). An inverse relation between lipid-storing phenotype and autophagy was also found, since microtubule-associated protein 1A/1B-Light Chain 3 (LC3) lipidation is reduced in melanosphere-derived CSC. To investigate upstream autophagy regulators, Phospho-AMP activated Protein Kinase (P-AMPK) and Phospho-mammalian Target of Rapamycin (P-mTOR) were analyzed; lower P-AMPK and higher P-mTOR expression in melanosphere-derived CSC were found, thus explaining, at least in part, their lower autophagic activity. In addition, co-localization of LC3-stained autophagosome spots and perilipin-stained lipid droplets was demonstrated mainly in differentiating melanosphere-derived cells, further supporting the role of autophagy in lipid droplets clearance. The present manuscript demonstrates an inverse relationship between lipid-storing phenotype and melanoma stem cells differentiation, providing novel indications involving autophagy in melanoma stem cells biology

Aptidão dos solos pra o cultivo do arroz irrigado no estado do Rio Grande do Sul.

bitstream/CPACT-2010/12302/1/Fili-Flores-solosarroz.pd

Efeito do tipo de solo nos componentes de produção da videira e na composição da uva merlot no vale dos vinhedos - safra 2014.

Este trabalho teve o objetivo de avaliar o efeito de cinco tipos de solo nos componentes de produção da videira Merlot e na composição do mosto da uva durante a safra de 2014.Resumo expandido

Effect of soil characteristics on phenolic compounds and antioxidant activity of merlot wine.

The objective of this work was to establish the effect of three taxonomic classes of soil, i. e., Argissolo (Ultisol), Cambissolo (Inceptisol) and Neossolo (Entisol), on the phenolic compounds of wines made from grapes grown on these soils in the DO Vale dos Vinhedos, Bento Gonçalves, RS

Efeito do tipo de solo nos componentes de produção da videira e na composição da uva merlot no vale dos vinhedos - safra 2014.

Este trabalho teve o objetivo de avaliar o efeito de cinco tipos de solo nos componentes de produção da videira Merlot e na composição do mosto da uva durante a safra de 2014.Resumo expandido