Project description:Hydrogen sulfide (H2S), present in abundance in the mammalian brain, has recently been demonstrated to induce a dose- and time-dependent apoptotic-necrotic continuum in murine primary cortical neurons, which was successfully attenuated upon application of N-methyl-D-aspartate (NMDA) receptor antagonist. The current study focused on gaining an insight into the molecular mechanisms of H2S–mediated neuronal death pertaining to NMDA receptors activation through global gene expression comparisons.
Project description:Hydrogen sulfide (H2S), present in abundance in the mammalian brain, has recently been demonstrated to induce a dose- and time-dependent apoptotic-necrotic continuum in murine primary cortical neurons, which was successfully attenuated upon application of N-methyl-D-aspartate (NMDA) receptor antagonist. The current study focused on gaining an insight into the molecular mechanisms of H2S–mediated neuronal death pertaining to NMDA receptors activation through global gene expression comparisons. A total of 24 RNA samples were analyzed. There are 2 treatment conditions, namely 200uM sodium hydrosulfide and 200uM N-methyl-D-asparate. 3 replicates were collected for each of the selected time-points (5h, 15h and 24h), in addition to 6 replicates of shared vehicle control. The supplementary file 'GSE16035_non-normalized_data.txt' contains non-normalized data for Samples GSM401312-GSM401335.
Project description:As one of the most important environmental factors, heat stress (HS) has been found to affect various biological activities of organisms such as growth, signal transmission, primary metabolism and secondary metabolism. Ganoderma lucidum has become a potential model system for evaluating how environmental factors regulate the secondary metabolism of basidiomycetes. Previous research showed that HS can induce the biosynthesis of ganoderic acids (GAs). In this study, we found the existence of hydrogen sulfide in Ganoderma lucidum; moreover, HS increased GAs biosynthesis and could affect the hydrogen sulfide content. We found that sodium hydrosulfide (NaHS), an exogenous donor of hydrogen sulfide, could revert the increased GAs biosynthesis elicited by HS. This result indicated that an increased content of hydrogen sulfide, within limits, was associated with HS-induced GAs biosynthesis. Our results further showed that the GAs content was increased in CBS-silenced strains and could be reverted to WT strain levels by the addition of NaHS. Transcriptomic analyses indicated that that H2S can affect various intracellular signal pathways and physiological processes in G. lucidum. Further studies showed that H2S could affect the intracellular calcium concentration and thus regulate the biosynthesis of GAs. This study demonstrated that hydrogen sulfide is involved in the regulation of secondary metabolic processes induced by heat stress in filamentous fungi.
Project description:Stress response of Methylococcus capsulatus str.Bath toward hydrogen sulfide (H2S) was investigated via physiological study and transcriptomic profiling. M. capsulatus (Bath) can grow and tolerate up to 0.75%vol H2S in headspace. Vast change in pH suggests biological relevant sulfide oxidation. Dozens of H2S-sensitive genes were identified from comparison of cell transcriptome in different H2S concentrations. Mc sulfide quinone reductase (SQR) and persulfide dioxygenase were found to be active during sulfide detoxification. Moreover, xoxF, a novel lanthanide(Ln)-dependent methanol dehydrogenase (MDH) was overexpressed in H2S while mxaF, a calcium-dependent MDH, was down-regulated, and such MDH switch phenomenon is also well known to be induced by addition of lanthanide via an as-yet-unknown mechanism. Activities in quorum sensing and RND efflux pump also suggest their role in sulfide detoxification, and might provide insight on the xoxF/mxaF switch mechanism.
Project description:Hypertension is a major risk factor for chronic kidney disease (CKD) and renal inflammation is an integral part in this pathology. Hydrogen sulfide (H2S) has been shown to mitigate renal damage through reduction in blood pressure and reactive oxygen species; however, the exact mechanisms are not clear. While several studies have underlined the role of epigenetics in renal inflammation and dysfunction, the mechanisms through which epigenetic regulators play role in hypertension are not well defined. We used microarrays to detail the global programme of gene expression underlying hypertension in the kidney and how hydrogen sulfide supplementation alleviates these effects.
Project description:Interventions: Case series:nill;The control group:nill
Primary outcome(s): Hydrogen sulfide;Pathological diagnosis
Study Design: Case-Control study
Project description:The purpose of this study is to detect the concentration of various gases,including hydrogen, methane, hydrogen sulfide, nitric oxide in different parts of the digestive tract by a safe and direct method, and to establish a human digestive tract gas profiles. Analyze the differences in gas components in different segments of the digestive tract in patients with different diseases, and analyze the correlation between specific gases and digestive tract diseases and non-specific symptoms.
Project description:The aim of this experiment was to determine how exposure of Hydrogen sulfide impacts gene expression in Mycobacterium tuberculosis. RNA was isolated from actively growing mycobacterial cells (0.6-0.8 OD600) using Trizol according to established protocols (27). Briefly, cells were exposed to 25 µM GYY4137 for 1 hr under carefully controlled conditions (n=3/group) and RNA isolated. Unexposed cells received spent GYY4137 (without any capacity to produce Hydrogen sulfide).