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Hydrogen sulfide

Shoutao Zhang, Li Zhu, Hanyu Liu, Guochun Yang
Inspired by the diverse properties of hydrogen sulfide, iron sulfide, and iron hydrides, we combine first-principles calculations with structure prediction to find stable structures of Fe-S-H ternary compounds with various FexSyHz (x = 1-2; y = 1-2; z = 1-6) compositions under high pressure with the aim of finding novel functional materials. It is found that Fe2SH3 composition stabilizes into an orthorhombic structure with Cmc21 symmetry, whose remarkable feature is that it contains dumbbell-type Fe with an Fe-Fe distance of 2...
October 26, 2016: Inorganic Chemistry
Zhe Zeng, Mohammednoor Altarawneh, Ibukun Oluwoye, Peter Glarborg, Bogdan Z Dlugogorski
This study resolves the interaction of sulfanyl radical (SH) with aliphatic (C1-C4) hydrocarbons, using CBS-QB3 based calculations. We obtained the C-H dissociation enthalpies and located the weakest link in each hydrocarbon. Subsequent computations revealed that, H abstraction by SH from the weakest C‒H sites in alkenes and alkynes, except for ethylene, appears noticeably exothermic. Furthermore, abstraction of H from propene, 1-butene and iso-butene displays pronounced spontaneity (i.e., ΔrG° < -20 kJ mol-1 between 300 - 1200 K) due to the relatively weak allylic hydrogen bond...
October 25, 2016: Journal of Physical Chemistry. A
Zhuping Jin, Yanxi Pei
No abstract text is available yet for this article.
October 21, 2016: Science China. Life Sciences
Lu Gao, Tian-Wen Wu, Xin Ni
Nitric oxide, carbon monoxide and hydrogen sulfide synthesized endogenously in living organisms produce an array of disparate biological effects, so as to be considered as gas transmitters. These three gaseous molecules play important roles in many physiological and pathological processes in the bodies, such as the regulation of vascular tone and inflammatory responses as well as reproductive function. This review mainly focuses on the distribution and biological functions of these three gas transmitters in female reproductive tissues...
October 25, 2016: Sheng Li Xue Bao: [Acta Physiologica Sinica]
Hang Zheng, Hong-Yan Zhu, Xiao-Yu Zhang, Meng Wang, Ying Xiao, Guang-Yin Xu, Xing-Hong Jiang
Hydrogen sulfide (H2S) contributes to visceral hyperalgesia in primary sensory neurons, but its role in central nervous system remains largely unknown. This study was to investigate the roles and underlying mechanisms of H2S and its endogenous synthesis enzymes in the arcuate nucleus (ARC) in rat pancreatic hyperalgesia. Chronic pancreatitis (CP) was induced in male adult Sprague-Dawley rats by intra-pancreatic ductal injection of trinitrobenzene sulfonic acid (TNBS). Abdominal hyperalgesia was assessed by referred somatic behaviors to mechanical stimulation of rat abdomen...
October 25, 2016: Sheng Li Xue Bao: [Acta Physiologica Sinica]
Paola De Cicco, Elisabetta Panza, Giuseppe Ercolano, Chiara Armogida, Giuseppe Sessa, Giuseppe Pirozzi, Giuseppe Cirino, John L Wallace, Angela Ianaro
Inflammation plays a key role in tumor promotion and development. Indeed, cyclooxygenase-2 (COX-2) expression is strongly associated with different types of cancer. An emerging class of compounds with significant anti-inflammatory properties is the hydrogen sulfide-releasing non-steroidal anti-inflammatory drugs (H2S-NSAIDs). They consist of a traditional NSAID to which an H2S-releasing moiety is covalently attached. We have recently demonstrated that H2S donors inhibit melanoma cell proliferation. In the current study, we evaluated the potential beneficial effects of a new H2S-releasing derivative of naproxen, ATB-346 [2-(6- methoxynapthalen-2-yl)-propionic acid 4-thiocarbamoyl phenyl ester] which inhibits COX activity but also releases H2S...
October 21, 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
Yu Zhao, Michael D Pluth
Hydrogen sulfide (H2 S) exhibits promising protective effects in many (patho)physiological processes, as evidenced by recent reports using synthetic H2 S donors in different biological models. Herein, we report the design and evaluation of compounds denoted PeroxyTCM, which are the first class of reactive oxygen species (ROS)-triggered H2 S donors. These donors are engineered to release carbonyl sulfide (COS) upon activation, which is quickly hydrolyzed to H2 S by the ubiquitous enzyme carbonic anhydrase (CA)...
October 24, 2016: Angewandte Chemie
Baohua Tian, Zengjie Qiao, Liping Zhang, Hua Li, Yanxi Pei
Hydrogen sulfide (H2S) and some functional amino acids in crops have been involved in the defense system against heavy-metal pollution. Here we report the relationships and functions of H2S and proline to cadmium (Cd) stress. Sodium hydrosulfide (NaHS) pretreatment decreased the electrolytic leakage and the malondialdehyde and hydrogen peroxide contents while enhancing photosynthesis in Cd-treated seedlings. Furthermore, pretreatment with NaHS markedly exacerbated Cd-induced alterations in proline content, the activities of proline-5-carboxylate reductase (P5CR) and proline dehydrogenase (PDH), and the transcript levels of P5CR and PDH...
October 13, 2016: Plant Physiology and Biochemistry: PPB
Wenqin Wu, Beibei Yu, Huimin Wu, Shengfu Wang, Qinghua Xia, Yu Ding
Different phases of cobalt sulfides have been fabricated by one-pot hydrothermal method. Comparing all of the prepared materials, and the results revealed that CoS was the most conductive and could accelerate electron transfer. The CoS presented tremella-like and excellent catalytic activities towards hydrogen peroxide and glucose. The sensor based on CoS performed amperometric sensing of hydrogen peroxide in a linear range between 5.00μM and 14.82mM. Meanwhile, sensing of glucose with double-linear range, one is between 5...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Lin Yuan, Yue Pan, Tian-Bing Ren, Dan Cheng, Ze-Bing Zeng, Xiao-Bing Zhang
Thiophenols are highly toxic industrial materials that once released, will accumulate in environment and ultimately into human bodies, causing serious health problems. To achieve their selective and sensitive detection, herein a novel near-infrared fluorescent probe CCP-1 from a focused library was developed for thiophenol species. Our studies show that CCP-1 displays a thiophenol-triggered 28-fold fluorescence intensity enhancement at 706 nm, with a detection limit of 34 nM observed. It is also able to differentiate thiophenols from various other thiol-containing analytes including hydrogen sulfide, hydrogen persulfide and aliphatic thiols...
October 21, 2016: Chemistry, An Asian Journal
Stefano Fiorucci, Angela Zampella, Giuseppe Cirino, Mariarosaria Bucci, Eleonora Distrutti
Bile acids are end product of cholesterol metabolism generated in the liver and released in the intestine. In addition to their role in nutrient absorption, bile acids are increasingly recognized as regulatory signals which exert their function beyond the intestine by activating a network of membrane and nuclear receptors. The best characterized of these bile acid activated receptors, GPBAR1 (also known as TGR5) and the Farnesosid-x-receptor (FXR) have also been detected in the vascular system and their activation mediate the vasodilatory effects of bile acids in the systemic and splanchnic circulation...
October 7, 2016: American Journal of Physiology. Heart and Circulatory Physiology
Jay S Naik, Jessica M Osmond, Benjimen R Walker, Nancy L Kanagy
Hydrogen sulfide (H2S) is a recently described gaseous vasodilator produced within the vasculature by the enzymes cystathionine γ-lyase and 3-mercaptopyruvate sulfurtansferase. Previous data demonstrate that endothelial cells (EC) are the source of endogenous H2S production and are required for H2S-induced dilation. However, the signal transduction pathway activated by H2S within EC has not been elucidated. TRPV4 and large conductance Ca(2+)-activated K channels (BK channels) are expressed in EC. H2S-induced dilation is inhibited by luminal administration of iberiotoxin and disruption of the endothelium...
October 7, 2016: American Journal of Physiology. Heart and Circulatory Physiology
Ning Xia, Huige Li
Under physiological conditions, perivascular adipose tissue (PVAT) attenuates agonist-induced vasoconstriction by releasing vasoactive molecules including hydrogen peroxide, angiotensin 1-7, adiponectin, methyl palmitate, hydrogen sulfide, nitric oxide (NO) and leptin. This anticontractile function of PVAT is lost under conditions of obesity. The central mechanism underlying PVAT dysfunction in obesity is likely to be an "obesity triad" (consisting of PVAT hypoxia, inflammation and oxidative stress) that leads to dysregulation of PVAT-derived vasoregulators...
October 20, 2016: British Journal of Pharmacology
Vasileios Ziogas, Georgia Tanou, Maya Belghazi, Grigorios Diamantidis, Athanassios Molassiotis
BABA or GABA induces salinity acclimation during citrus seeds germination via alternation of specific proteins (e.g., citrin). The impact of four elicitors, namely hydrogen peroxide (H2O2), β-amino butyric acid (BABA), γ-amino butyric acid (GABA) and hydrogen sulfide (H2S) donor, sodium hydrosulfide (NaHS), in citrus seed germination under salinity (150 mM NaCl) was tested. The germination potential was adversely affected by NaCl-alone treatment. Pretreatment with H2O2 or the NaHS-H2S donor prior to salinity had no significant effect in germination process, however, BABA and GABA substantially improved seed acclimation to salinity, as evidenced by increased germination percentage and radicle length...
October 19, 2016: Plant Cell Reports
Zhe Lv, Nasir Mahmood, Muhammad Tahir, Lun Pan, Xiangwen Zhang, Ji-Jun Zou
Transition metal dichalcogenides (TMDs) are emerging as promising materials, particularly for electrochemical and photochemical catalytic applications, and among them molybdenum sulfides have received tremendous attention due to their novel electronic and optoelectronic characteristics. Several review articles have summarized the recent progress on TMDs but no critical and systematic summary exists about the nanoscale fabrication of MoS2 with different dimensional morphologies. In this review article, first we will summarize the recent progress on the morphological tuning and structural evolution of MoS2 from zero-dimension (0D) to 3D...
October 20, 2016: Nanoscale
Yoshihiro Nabeshima, Daisuke Onozuka, Takanari Kitazono, Akihito Hagihara
It is well known that certain types of media reports about suicide can result in imitative suicides. In the last two decades, Japan has experienced two suicide epidemics and the subsequent excessive media coverage of these events. However, the quality of the media suicide reports has yet to be evaluated in terms of the guidelines for media suicide coverage. Thus, the present study analyzed Japanese newspaper articles (n = 4007) on suicides by charcoal burning or hydrogen sulfide gas between 11 February 2003 and 13 March 2010...
October 15, 2016: International Journal of Environmental Research and Public Health
Zena Huang, Xiaobian Dong, Xiaodong Zhuang, Xun Hu, Lichun Wang, Xinxue Liao
Hyperglycemia serves an important role in the pathogenesis of diabetic cardiomyopathy. The aim of the present study was to investigate whether exogenous hydrogen sulfide (H2S) protects against high glucose‑induced inflammation and cytotoxicity in cardiac cells by inhibiting the p38 mitogen‑activated protein kinase (MAPK)/nuclear factor‑κB (NF‑κB), cyclooxygenase‑2 (COX‑2) and inducible nitric oxide synthase (iNOS) signaling pathways. Rat H9c2 myocardium cells were exposed to 33 mM glucose (high glucose, HG) for 24 h to stimulate HG‑induced cytotoxicity...
October 13, 2016: Molecular Medicine Reports
Heng-Jing Hu, Zhi-Sheng Jiang, Sheng-Hua Zhou, Qi-Ming Liu
The effects of hydrogen sulfide (H2S) and the nuclear factor κB (NF-κB) signaling pathway in angiotensin II (AngII)-induced endothelin-1 (ET-1) expression and subsequent cytotoxicity remain unclear. The present study aimed to investigate the hypothesis that H2S protects human umbilical vein endothelial cells (HUVECs) against AngII‑stimulated ET‑1 generation and subsequent cytotoxicity‑induced endoplasmic reticulum stress via the NF‑κB signaling pathway. The results of the present study demonstrated that AngII significantly upregulated the expression levels of ET‑1, glucose‑regulated protein 78, CCAAT‑enhancer‑binding protein homologous protein, phosphorylated (p)‑p65 and inducible nitric oxide synthase; stimulated nitric oxide production; suppressed the expression and activity of cystathionine-γ-lyase (CSE), a H2S synthetase; and decreased cell viability...
October 12, 2016: Molecular Medicine Reports
Akbar Ahmad, Domokos Gerö, Gabor Olah, Csaba Szabo
Hydrogen sulfide (H2S) has been proposed to exert pro- as well as anti-inflammatory effects in various models of critical illness. In this study, we compared bacterial lipopolysaccharide (LPS)‑induced changes in inflammatory mediator production, indices of multiple organ injury and survival in wild‑type (WT) mice and in mice with reduced expression of one of the three H2S‑producing enzymes, cystathionine-γ-lyase (CSE), cystathionine-β-synthase (CBS) or 3-mercaptopyruvate sulfurtransferase (3MST)...
October 14, 2016: International Journal of Molecular Medicine
Thomas F Boudreau, Gregory M Peck, Sean F O'Keefe, Amanda C Stewart
BACKGROUND: Fungicide residues on fruit may adversely affect yeast during cider fermentation, leading to sluggish or stuck fermentation or the production of hydrogen sulfide (H2 S), an undesirable aroma compound. This phenomenon has been studied in grape fermentation, but not in apple fermentation. Low nitrogen availability, characteristic of apples, may further exacerbate the effects of fungicides on yeast during fermentation. This study explored the effects of three fungicides: elemental sulfur (S(0) ), (known to result in increased H2 S in wine), fenbuconazole (used in orchards but not vineyards); and fludioxonil (used in post-harvest storage of apples)...
October 16, 2016: Journal of the Science of Food and Agriculture
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