Reactive oxygen species (ROS) play key roles in various intracellular processes and have been shown to be involved in many diseases (eg. carcinogenesis, inflammation…). Each of the ROS species is likely to have a specific role in living cells. Therefore, there is an emerging need for selectively detecting each species of ROS through conventional biochemical assays, but also in live cell imaging (see a previous post “Reactive Oxygen Species (ROS) and related assay kits“).
Mitochondria keep cells “healthy” in their environment. In this post, we’ll take a look at a new fluorescent assay for the monitoring of mitophagy, a process aimed at clearing damaged or superfluous mitochondria by autophagy, in mammalian cells.
Reactive Oxygen Species (ROS) are reactive molecules and free radicals derived from molecular oxygen involved in cellular homeostasis. An excess of ROS production (e.g. exposure to environmental stress such as UV or heat exposure) causes significant damage to cell structures. In this post, let’s review the research tools for studying this process also known as Oxidative stress.
Singlet Oxygen (1O2) fluorescent detection in living cells was limited by the lack of availability of cell membrane permeable dyes. The silicon-based far-red fluorescent probe (Si-DMA) has been especially designed to monitor singlet oxygen in real-time and in living cells. Si-DMA is now commercially available for ROS studies by live-cell imaging.
Oxidative stress can lead to diverse pathophysiological changes in the body. Neurodegenerative diseases such as Parkinson and Alzheimer are linked to oxidative stress, as well as several cancers and diseases such as chronic fatigue syndrome, fragile X syndrome, heart and blood vessel disorders, heart attack, heart failure, and atherosclerosis (for an overview see Fig 1). [Read more…]
Free radicals and Reactive Oxygen Species (ROS) are highly reactive molecules generated by normal cellular processes, environmental stress, and UV irradiation. ROS react with numerous cellular components damaging DNA (but also carbohydrates, proteins, and lipids) and cause cellular and tissue injury. Measuring antioxidative capacities of biological fluids, cells, and tissue such active molecules is becoming more and more important in the pharmaceutical industry and in academic laboratories. Let’s focuse here on 2 robust methods.
Both ROS (Reactive Oxygen Species) and RNS (Reactive Nitrogen Species) on the one hand, and the small G proteins belonging to the Rho family on the other hand, are key regulators in various signal transduction pathways.
More recently it has been suggested that crosstalk between reactive species and Rho GTPases plays a crucial role in some of their physiological functions. Furthermore, these crosstalk events have been linked to pathological processes, e.g. lung injury and cancer.
Our partner Cytoskeleton Inc. has summarized recent findings in the newsletter Rho GTPases and Reactive Oxygen Species: Crosstalk and Feedback. Let’s take a look at what’s available for research in this area.