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Stress Fibers, Autophagy and Necrosis by Persistent Exposure to PM2.5 from Biomass Combustion
Abstract: Fine particulate matter (PM2.5) can adversely affect human health. Emissions from residential energy sources have the largest impact on premature mortality globally, but their pathological and molecular implications on cellular physiology are still elusive. In the present study potential molecular consequences were investigated during long-term exposure of human bronchial epithelial BEAS-2B cells to PM2.5, collected from a biomass power plant. Initially, we observed that PM2.5 did not affect cellular survival or proliferation. However, it triggered an activation of the stress response p38 MAPK which, along with RhoA GTPase and HSP27, mediated morphological changes in BEAS-2B cells,...
On the Validity of Fluorimetric Intracellular Calcium Detection: Impact of Lipid Components
Abstract: We investigated the effects of different lipids on the activity of the angiotensin II type 1 receptor (AT1R). As calcium plays a key role in the signaling of the AT1R, we used the calcium-sensitive fluorescence indicators fura-2 to detect intracellular calcium release upon stimulation with the agonist angiotensin II. At first sight, cells preincubated with Very low-density lipoprotein (VLDL) showed a reduced calcium release triggered by angiontensin II compared to untreated control. However, on closer examination, this result seemed to be an artifact. Incubation with VLDL reduced also the amount of intracellular fura-2, as measured by fluorescence in the isosbestic point. Additionally, the maximal obtainable ratio, obtained after complete saturation with calcium ions, was reduced in cells preincubated with VLDL. These findings rendered our initial results questionable. We report the results of our work and our suggestions regarding the experimental setup to contribute to the understanding of the interpretation of fura-2 measurements and to avoid erroneous conclusions
Systems Biology of Apoptosis
Systems Biology of Apoptosis summarizes all current achievements in this emerging field. Apoptosis is a process common to all multicellular organisms. Apoptosis leads to the elimination of cells via a complex but highly defined cellular programme. Defects in the regulation of apoptosis result in serious diseases such as cancer, autoimmunity, AIDS and neurodegeneration. Recently, a substantial step forward in understanding the complex apoptotic pathways has been made by utilising systems biology approaches. Systems biology combines rigorous mathematical modelling with experimental approaches in a closed loop cycle for advancing our knowledge about complex biological processes. In this book, the editor describes the contemporary systems biology studies devoted to apoptotic signaling and focuses on the question how systems biology helps to understand life/death decisions made in the cell and to develop new approaches to rational treatment strategies.
The Ecology of Herbal Medicine
The Ecology of Herbal Medicine introduces botanical medicine through an in-depth exploration of the land, presenting a unique guide to plants found across the American Southwest. An accomplished herbalist and geographer, Dara Saville offers readers an ecological manual for developing relationships with the land and plants in a new theoretical approach to using herbal medicines. Designed to increase our understanding of plants' rapport with their environment, this trailblazing herbal speaks to our innate connection to place and provides a pathway to understanding the medicinal properties of plants through their ecological relationships. With thirty-nine plant profiles and detailed color photographs, Saville provides an extensive materia medica in which she offers practical tools and information alongside inspiration for working with plants in a way that restores our connection to the natural world.
