Abstract:
AIMS:Hydrogen sulfide (H(2)S) at low concentrations serves as a physiological endogenous vasodilator molecule, while at higher concentrations it can trigger cytotoxic effects. The aim of our study was to elucidate the potential mechanisms responsible for the effects of H(2)S on vascular tone. MAIN METHODS:We measured the vascular tone in vitro in precontracted rat thoracic aortic rings and we have tested the effect of different oxygen levels and a variety of inhibitors affecting known vasodilatory pathways. We have also compared the vascular effect of high concentrations of H(2)S to those of pharmacological inhibitors of oxidative phosphorylation. Furthermore, we measured adenosine triphosphate (ATP)-levels in the same vascular tissues. KEY FINDINGS:We have found that in rat aortic rings: (1) H(2)S decreases ATP levels; (2) relaxations to H(2)S depend on the ambient oxygen concentration; (3) prostaglandins do not take part in the H(2)S induced relaxations; (4) the 3':5'-cyclic guanosine monophosphate (cGMP)-nitric oxide (NO) pathway does not have a role in the relaxations (5) the role of K(ATP) channels is limited, while Cl(-)/HCO(3)(-) channels have a role in the relaxations. (6): We have observed that high concentrations of H(2)S relax the aortic rings in a fashion similar to sodium cyanide, and both agents reduce cellular ATP levels to a comparable degree. SIGNIFICANCE:H(2)S, a new gasotransmitter of emerging importance, leads to relaxation via Cl(-)/HCO(3)(-) channels and metabolic inhibition and the interactions of these two factors depend on the oxygen levels of the tissue.
journal_name
Life Scijournal_title
Life sciencesauthors
Kiss L,Deitch EA,Szabó Cdoi
10.1016/j.lfs.2008.08.006subject
Has Abstractpub_date
2008-10-24 00:00:00pages
589-94issue
17-18eissn
0024-3205issn
1879-0631pii
S0024-3205(08)00340-8journal_volume
83pub_type
杂志文章相关文献
LIFE SCIENCES文献大全abstract::The present study was designed to investigate the effects of the intrahippocampal co-injection of beta-amyloid protein1-40 (Abeta(1-40)) with ibotenic acid (Ibo) on learning and memory in normal and aging model rats, and to explore the mechanism underlying the effects of the co-injection. The normal and aging rats wer...
journal_title:Life sciences
pub_type: 杂志文章,收录出版
doi:10.1016/j.lfs.2004.05.039
更新日期:2005-01-28 00:00:00
abstract::Recent studies on video game playing have uncovered a wide range of measurable physiological effects on the organism, such as increases in cardiovascular activity and breathing responses. However, the exact source of these effects remains unclear. Given the well-known effects of sound on physiological activity, especi...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/j.lfs.2004.11.011
更新日期:2005-04-01 00:00:00
abstract:AIMS:To characterize the effects of a calorie matched high-fat diet (HFD) on spontaneous physical activity (SPA), body weight, inflammatory status and expression of genes related to energy homeostasis in hypothalamus of mice. MAIN METHODS:C57Bl/6 mice (n=5 per group) were fed a control diet (16.5% calories from fat) -...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/j.lfs.2017.04.017
更新日期:2017-06-15 00:00:00
abstract::Carbachol (CCH), serotonin (5HT), divalent ionophore A23187, cAMP, and certain neuropeptides, i.e. substance P (SP), inhibit the initial rate of uptake (influx) of 22Na into isolated chicken villus enterocytes. All these agents also increase cytosolic Ca. However, the increases stimulated by CCH, 5HT, and cAMP are not...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/0024-3205(90)90506-m
更新日期:1990-01-01 00:00:00
abstract::The effect of nimodipine on nitric oxide synthase (NOS) activities in brains in transient focal cerebral ischemia rats, in cultured mouse neurons and astroglial cells and bovine brain capillary endothelial cells (BCECs) was investigated. The administration of nimodipine (3 mg.kg(-1), p.o., twice a day, for 3 days) bef...
journal_title:Life sciences
pub_type: 杂志文章
doi:
更新日期:1999-01-01 00:00:00
abstract::The complexes of the type [PtCl(L2)(ACRAMTU)](NO3)2 (ACRAMTU = 1-[2-(acridin-9-ylamino)ethyl]-1,3-dimethylthiourea) were synthesized: PT-ACRAMTU (1), L2 = ethane-1,2-diamine (en); PT(dach)-ACRAMTU (2), L2 = (1R,2R)-1,2-diaminocyclohexane (dach); PT(pda-OH)-ACRAMTU (3), L2 = 2-hydroxy-1,3-propanediamine (pda-OH). The c...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/j.lfs.2018.11.052
更新日期:2019-01-15 00:00:00
abstract:AIMS:High fat diet consumes and thyroid hormones (THs) disorders may affect nutrients metabolism, but their impact on the absorptive epithelium, the first place of nutrients access, remains unknown. Our aim was to evaluate the intestinal morphology and nutrients transporters content in mice fed standard (LFD) or high f...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/j.lfs.2018.03.053
更新日期:2018-06-01 00:00:00
abstract::To understand whether chronic inflammation alters the development of morphine tolerance, the tail-flick test was used to evaluate the analgesic effect of morphine (75 mg tablet, s.c.) in the arthritic rats at the day 9-12 after the inoculation with Freund's adjuvant. Spinal cord monoamines and amino acid neurotransmit...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/s0024-3205(99)00008-9
更新日期:1999-01-01 00:00:00
abstract::Different receptors mediating the release of endothelium-derived nitric oxide (EDNO) have been identified at endothelial level. In the present study we aimed to characterise, on rabbit aorta by means of pharmacological tools, the generation of EDNO by receptors located on endothelial cell membrane (M3, P2u, P2y) and b...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/s0024-3205(97)01144-2
更新日期:1998-01-01 00:00:00
abstract::Effects of intracellular accumulation of isoproterenol (ISO) on lactate production were examined in perfused rat heart. The lactate production during ISO perfusion in rat heart was increased and subsequent addition of an inhibitor of catechol-O-methyl transferase (COMT) further enhanced the production, and the enhance...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/0024-3205(90)90284-x
更新日期:1990-01-01 00:00:00
abstract::Learned helplessness (LH) consists of shock escape deficits evidenced by animals previously exposed to inescapable shock. This phenomenon has shown promise as a behavioral screen for new antidepressant drugs. Unfortunately, some stocks of rats evidence low susceptibility to LH training. Accordingly, male rats from 8 d...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/0024-3205(86)90376-0
更新日期:1986-09-08 00:00:00
abstract::The colchicine-induced accumulation of vasopressin (AVP) and oxytocin (OXT) has recently been applied to estimate the synthesis and turnover rates for these neuropeptides in whole rat hypothalamus. In the present studies, this pharmacologic procedure has been examined as a potential method for estimating hypothalamic ...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/0024-3205(91)90441-d
更新日期:1991-01-01 00:00:00
abstract::Microiontophoretic study was performed to elucidate dopaminergic mechanism in the nucleus accumbens (Acc) of rats anesthetized with chloral hydrate. Iontophoretically applied dopamine produced an inhibition of glutamate-induced firing in 28 (62%) out of 45 Acc neurons tested. The dopamine-induced inhibition of 14 Acc ...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/0024-3205(83)90356-9
更新日期:1983-06-06 00:00:00
abstract::The multiple functions of the blood-brain barrier (BBB) consist mostly in membrane properties controlling the bidirectional exchange of molecules between the general circulation and the central nervous system. As lipophilic molecules are able to easily penetrate the membrane of brain microvessels endothelial cells, an...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/0024-3205(88)90351-7
更新日期:1988-01-01 00:00:00
abstract::Uptake of 131iodine-metaiodobenzylguanidine (131I-MIBG) by 6-23 rat medullary thyroid carcinoma (MTC), was studied in vitro and in vivo. In vitro, there was an 8-fold increase in 131I uptake by 6-23 cells when labeled with 131I-MIBG (131I 24 +/- 15 cpm/10(6) cells, 131I-MIBG 196 +/- 9 cpm/10(6) cells). MIBG uptake in ...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/0024-3205(89)90456-6
更新日期:1989-01-01 00:00:00
abstract::Endogenous dopamine (DA) and norepinephrine (NE) in the superfusate from slices of rat medial prefrontal cortex were measured by high-performance liquid chromatography coupled to electrochemical detection (HPLC-ECD). Stimulation with high K+ or methamphetamine (MAP) evoked a dose-dependent elevation in the release of ...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/0024-3205(91)90356-g
更新日期:1991-01-01 00:00:00
abstract::We have used the antibiotic gradient-plate technique to generate antifungal producing Actinomadura strains that synthesize enhanced quantities of component 3A of a macrocyclic lactam antifungal compound Sch 38516. Seventy-nine colonies were selected from a mixture of rifampicin and spectinomycin gradient plates. The t...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/0024-3205(92)90336-n
更新日期:1992-01-01 00:00:00
abstract::Palytoxin induced increases in cytosolic Ca2+ and tension, which were dependent on external Ca2+, and depolarized the membrane in endothelium-denuded porcine coronary arteries. When the endothelium was present, however, these effects were greatly inhibited, suggesting that some factors from endothelium inhibited the p...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/s0024-3205(96)00682-0
更新日期:1997-01-01 00:00:00
abstract::The injection of neostigmine into the hippocampus of anesthetized rats increased the mean arterial blood pressure (17% of baseline after 60 min injection) and decreased the heart rate (24% of baseline after 60 min injection). These changes were blocked by the co-administration of methylatropine into the hippocampus. I...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/0024-3205(92)90377-2
更新日期:1992-01-01 00:00:00
abstract::Insulin remains a predominant life-saving medication for type 1 and type 2 Diabetes Mellites. Natural insulin secretion limits the fluctuation of the narrow and high surge of blood glucose levels. However, imitating the same by external insulin remains a challenge as a variety of insulin analogs (rapid acting, short a...
journal_title:Life sciences
pub_type: 杂志文章,评审
doi:10.1016/j.lfs.2019.01.011
更新日期:2019-02-15 00:00:00
abstract::The rate of oxidation of sparteine by the 9000 x g supernatant fraction of a human liver was measured in the presence of various drugs which exert cardiovascular effects. Hexamethonium, ouabain, caffeine and isoproterenol had no effect on this rate, while alprenolol, metoprolol, oxprenolol, propranolol, timolol, pindo...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/0024-3205(84)90332-1
更新日期:1984-01-02 00:00:00
abstract::Epidemiological studies have shown that cigarette smoke, an oxidant agent, is a risk factor for the development of diabetic nephropathy (DN), in which pathogenesis transforming growth factor beta(1) (TGFbeta(1)) plays a key role. In our experimental model we exposed mesangial cell cultures to cigarette smoke concentra...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/j.lfs.2003.12.026
更新日期:2004-06-18 00:00:00
abstract::The effect of dihydropyridine calcium channel antagonist isradipine (PN 200-110) on morphine reinforcement has been investigated using i.v. self-administration test in rats. Rats were given the opportunity to self-administer a solution of morphine (1 mg/ml, i.v.) in a 1 hr limited access paradigm (FR = 1). Within 5-7 ...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/0024-3205(96)00397-9
更新日期:1996-01-01 00:00:00
abstract:AIMS:Evidence has indicated U50,488H, a selective κ-opioid receptor (κ-OR) agonist, administered before ischemia attenuates apoptosis and infarction during ischemia and reperfusion (I/R). However, it remains unclear whether U50,488H postconditioning reduces apoptosis during I/R. This study was designed, therefore, to t...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/j.lfs.2010.10.018
更新日期:2011-01-03 00:00:00
abstract:AIMS:To explore the role of chemokine CC motif ligand 2 (CCL2) in spatial memory and cognition impairment, and the underlying mechanisms focused on inflammatory, glutamate metabolistic and apoptotic- associated mRNA expression. MATERIALS AND METHODS:Stereotaxic surgery was performed here to establish a rat model by bi...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/j.lfs.2020.117828
更新日期:2020-08-15 00:00:00
abstract::The in vivo effect of trazodone on the density of [(3)H]5-HT binding sites and 5-HT(1A) receptors and adenylyl cyclase (AC) response was studied in regions of rat brain. The chronic administration of trazodone (10 mg/Kg body wt, 40 days) resulted in a significant downregulation of [(3)H]5-HT binding sites and 5-HT(1A)...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/s0024-3205(02)01926-4
更新日期:2002-08-16 00:00:00
abstract::It has been reported that naloxone, an opioid antagonist, has antiarrhythmic activity in vivo. In Langendorff perfused rat hearts, we found that ischemia-reperfusion-induced ventricular tachyarrhythmia reverted to normal sinus rhythm after the treatment with naloxone (3 approximately 10 microM). The method of voltage ...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/s0024-3205(98)00383-x
更新日期:1998-01-01 00:00:00
abstract::The alpha 1-adrenoceptors present in liver membranes from rats, hamsters and mice were characterized using [3H]prazosin. In the liver membranes from the three species a relatively large number of receptors was observed (500-900 fmol/mg of protein) and the affinities for [3H]prazosin were very similar (0.2-0.3 nM). Mem...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/0024-3205(94)90134-1
更新日期:1994-01-01 00:00:00
abstract::The retina contains three catecholamine neurotransmitters: dopamine (DA); norepinephrine (NE); and epinephrine (EPI). DA and EPI appear to be associated with separate amacrine neurons that directly participate in the visual process. NE, in contrast, appears to be associated primarily with the sympathetic nerves that i...
journal_title:Life sciences
pub_type: 杂志文章,评审
doi:10.1016/0024-3205(84)90184-x
更新日期:1984-09-10 00:00:00
abstract::Intracerebroventricular (i.c.v.) administration of the neurohypophyseal neuropeptide arginine8-vasopressin (AVP) results in a dose-dependent attenuation of endotoxin-induced fever (EIF) in rats. Specific antagonists of the neuropeptided(CH2)5[Tyr(Me)2]AVP for V1 receptors, d(CH2)5[dlle2lle4]AVP for the V2 receptors an...
journal_title:Life sciences
pub_type: 杂志文章
doi:10.1016/0024-3205(92)90448-x
更新日期:1992-01-01 00:00:00