Farmland and mining ecotypes of the potential cadmium (Cd)-hyperaccumulator Solanum photeinocarpum were collected to study the effects of reciprocal grafting on the growth of, and Cd accumulation in, the post-grafting generations. The post generations of the following plant materials were evaluated in a pot experiment the un-grafted farmland ecotype, grafted plants with the farmland ecotype as the scion or the rootstock, the un-grafted mining ecotype, and grafted plants with the mining ecotype as the scion or the rootstock. The results showed that reciprocal grafting increased the biomass, the activities of superoxide dismutase, peroxidase, and catalase, and the soluble protein content in the post-grafting generations of both ecotypes S. photeinocarpum. Reciprocal grafting also increased the Cd content in, and amount of Cd extracted by, the post-grafting generations of both ecotypes S. photeinocarpum as a result of lower soil pH and higher soil available Cd concentrations. Additionally, grafting affected the DNA methylation levels by inducing hypermethylation or demethylation in the post-grafting generation. Therefore, reciprocal grafting can enhance the Cd accumulation (phytoremediation) capacity of post-grafting generations of both ecotypes S. photeinocarpum by affecting DNA methylation levels.Selenoproteins incorporate the 21st amino acid selenocysteine into their polypeptide chain. Seven members of this family reside in the endoplasmic reticulum (ER), controlling the redox and ionic environment to maintain proteostasis. Noteworthy, selenoprotein T (SELENOT) is the only ER-resident selenoprotein whose gene disruption induces embryonic lethality. As expected for essential genes, its structure is remarkably conserved across eukaryotes. Its thioredoxin-like domain supports selenosulfide/disulfide reactions, an oxidoreductase activity which is essential to maintain ER redox homeostasis. Reduction of SELENOT expression in transgenic cell and animal models leads to an accumulation of reactive oxygen and nitrogen species, depletion of Ca2+ stores, and activation of the unfolded protein response (UPR). Expectedly, hormone secretion is impaired in endocrine and neuroendocrine cells due to ER stress. When ER stress could not be alleviated, cell viability is compromised. Mechanistically, SELENOT is anchored to the ER membrane and is able to bind the STT3A-type oligosaccharyltransferase complex in order to regulate N-glycan occupancy of specific substrates including glycohormones and GPI-anchored proteins which have key roles in cell adhesion and communication. Given the importance of limiting the ER stress that occurs in different pathologies such as neurodegenerative, cardiovascular, metabolic and immune diseases, further work should be performed to better understand the role of SELENOT, and to design small mimetics such as selenopeptides to improve ER proteostasis and to prevent ER stress. In this review, we present the current state-of-art on the role of SELENOT in ER homeostasis, based on our observations that SELENOT is essential to alleviate ER stress.Background Measurement of testosterone (T), androstenedione (A4) and 17-hydroxyprogesterone (17OHP) usually requires a venous serum sample which may have implications for sample stability or collection. Objective A liquid chromatography-tandem mass spectrometry (LC-MS/MS) assay was developed for samples collected using Mitra devices. Analytical validation was completed, and sample comparisons were undertaken to assess Mitra versus venous samples. Method Sample was combined with deionized water and internal standard. After mixing, MTBE was added for extraction. The supernatant was transferred to a deep-well plate and dried prior to re-constitution. A HSS T3 column and Waters TQS Micro was used, the detected quantifier transitions were T m/z 289.2 > 96.95, A4 287.2 > 96.95 and 17OHP 331.25 > 96.95. Results Mean recovery was 102% for T, 98% for A4 and 97% for 17OHP. Lower limit of quantification was 1 nmol/L for T/A4 and 4 nmol/L for 17OHP. T was linear up to 41.6 nmol/L, A4 41.9 nmol/L and 17OHP 72.6 nmol/L. Ion suppression was less then 10% for all analytes. A4 and 17OHP showed minimal bias for Mitra samples collected from finger prick blood. The bias for T differed between capillary and venous blood, indicating differences in constituency. Discussion A simple, fast and reproducible LC-MS/MS assay has been developed for measurement of blood collected using Mitra devices for T, A4 and 17OHP. Further comparisons with serum and capillary blood collected onto Mitra devices serum may pave the way for future use in a clinical setting.Aims Doxorubicin cardiomyopathy is a lethal pathology characterized by oxidative stress, mitochondrial dysfunction, and contractile impairment, leading to cell death. Although extensive research has been done to understand the pathophysiology of doxorubicin cardiomyopathy, no effective treatments are available. We investigated whether monoamine oxidases (MAOs) could be involved in doxorubicin-derived oxidative stress, and in the consequent mitochondrial, cardiomyocyte and cardiac dysfunction. Results We used neonatal rat ventricular myocytes (NRVMs), and adult mouse ventricular myocytes (AMVMs). selleck chemicals llc Doxorubicin alone (i.e., 0.5 µM doxorubicin) or in combination with H2O2 induced an increase in mitochondrial formation of reactive oxygen species (ROS), that was prevented by the pharmacological inhibition of MAOs in both NRVMs and AMVMs. The pharmacological approach was supported by the genetic ablation of MAO-A in NRVMs. In addition, doxorubicin-derived ROS caused lipid peroxidation and alterations in mitochondrial function (i.e., mitochondrial membrane potential, permeability transition, redox potential), mitochondrial morphology (i.e., mitochondrial distribution and perimeter), sarcomere organization, intracellular [Ca2+] homeostasis, and eventually cell death. All these dysfunctions were abolished by MAO inhibition. Of note, in vivo MAO inhibition prevented chamber dilation and cardiac dysfunction in doxorubicin-treated mice. Innovation and Conclusion This study demonstrates that the severe oxidative stress induced by doxorubicin requires the involvement of MAOs, that modulate mitochondrial ROS generation. MAO inhibition provides evidence that mitochondrial ROS formation is causally linked to all disorders caused by doxorubicin in vitro and in vivo. Based upon these results, MAO inhibition represents a novel therapeutic approach for doxorubicin cardiomyopathy.