Mechanisms of microrheological responses of erythrocytes to the action of gasotransmitters: nitrogen oxide and hydrogen sulfide

Author(s):  
А.В. Муравьев ◽  
П.В. Михайлов ◽  
И.А. Тихомирова ◽  
Н. Антонова ◽  
А.А. Муравьев

Введение. Эритроциты — высокоспециализированные клетки, основной функцией которых является транспорт кислорода. Они лишены ядра и митохондрий, однако сохранили многие элементы молекулярных сигнальных путей. При выполнении транспортной функции эритроциты изменяют свои механические свойства и в том числе деформируются и объединяются в комплексы — агрегаты. Имеется ряд свидетельств того, что изменение механических свойств эритроцитов происходит под влиянием сигнальных молекул, к которым относятся и газовые медиаторы или газотрансмиттеры (ГТ). Это оксид азота, монооксид углерода и сульфид водорода. Цель исследования: изучение микрореологических ответов человеческих эритроцитов на действие ряда доноров газотрансмиттеров — оксида азота и сульфида водорода. Материалы и методы. После инкубирования эритроцитов с донорами оксида азота (спермином и нитропруссидом натрия) и донором сульфида водорода (гидросульфидом натрия) регистрировали деформируемость эритроцитов, их агрегацию и вязкость суспензий клеток (показатель гематокрита — 40%, вязкость суспензионной среды — 1,30 мПа × с; раствор Рингера и декстран‑200). Для уточнения механизмов действия ГТ на микрореологические свойства эритроцитов их инкубировали с ацетилхолином, серотонином и форсколином. Результаты. Установлено, что под влиянием ГТ происходят заметные изменения микромеханических свойств эритроцитов, которые статистически значимо изменялись под влиянием доноров оксида азота. Более существенные сдвиги микрореологии клеток, особенно их агрегацию, вызывал нитропруссид натрия. Гидросульфид натрия умеренно, но статистически значимо повышал деформируемость эритроцитов и заметно снижал их агрегацию, однако его эффекты уступали действию нитропруссида натрия. Заключение. На основании полученных данных и их анализа можно полагать, что внутриклеточными сигнальными путями для исследованных ГТ в эритроцитах при изменении их микромеханического состояния могут быть как ферменты гуанилатциклаза и аденилатциклаза, так и ионные каналы мембраны клетки. Introduction. Erythrocytes are highly specialized cells; oxygen transport is their main function. They have no nucleus and mitochondria, but they saved many elements of molecular signaling pathways. When erythrocytes performed the transport function they change their mechanical properties, deformed and combined into complexes — aggregates. There are some data that erythrocytes change their mechanical properties under the influence of signaling molecules such as gas mediators or gasotransmitters (GTs) — nitric oxide (NO), carbon monoxide and hydrogen sulfide. Aim: to study the microrheological responses of erythrocytes on the action of number GTs-donors — nitric oxide and hydrogen sulfide. Materials and methods. After erythrocytes incubation with NO-donors (spermine and sodium nitroprusside) and donor of hydrogen sulfide (sodium hydrosulfide) we registered erythrocytes deformability, their aggregation and viscosity of cell suspensions (hematocrit — 40%, viscosity of suspension medium — 1.30 mPa × s; Ringer’s solution and dextran‑200). To clarify the mechanisms of GTs action on microrheological properties of erythrocytes they were incubated with acetylcholine, serotonin and forskolin. Results. GTs noticeably changed erythrocytes micromechanical properties. Sodium nitroprusside caused significant shifts of erythrocytes microrheology, especially of erythrocytes aggregation. Sodium hydrosulfide moderately but statistically significant increased erythrocytes deformability and markedly reduced erythrocytes aggregation, but its effects were inferior to that of sodium nitroprusside. Conclusion. The study results suggest that guanylate cyclase and adenylate cyclase, as well as the ion channels of the cell membrane can be the intracellular signaling pathways in erythrocytes for investigated GTs.

Horticulturae ◽  
2021 ◽  
Vol 7 (7) ◽  
pp. 183
Author(s):  
Changxia Li ◽  
Guibao Chen ◽  
Dengjing Huang ◽  
Ni Wang ◽  
Weibiao Liao

As an important gaseous regulator, hydrogen sulfide (H2S) is involved in various aspects of plant processes, including seed germination, stomatal movement, and postharvest senescence. The preservation capacity of Lanzhou lily (Lilium davidii var. unicolor Salisb) scales fumigated with or without exogenously applied sodium hydrosulfide (NaHS, a H2S donor) was investigated in the current study. Results indicate that NaHS fumigation was able to extend storage life and elicit endogenous H2S production of postharvest Lanzhou lily scales with an optimal concentration at 0.8 mM. Moreover, exogenously applied NaHS (0.8 mM) led to higher soluble sugar, soluble protein, and ascorbic acid levels and lower total phenolic and flavonoid contents compared with those of the control. The application of 0.8 mM NaHS also reduced the lipid peroxidation level and reactive oxygen species (ROS) accumulation in scales, as indicated by the lower malondialdehyde (MDA) content, relative conductivity, lipoxygenase (LOX) activity, O2− production rate, and hydrogen per-oxide (H2O2) content. Further, scales treated with 0.8 mM NaHS exhibited significantly higher activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and ascorbic acid peroxidase (APX). Collectively, our data provide new insight into how the postharvest senescence of Lanzhou lily scales might be alleviated by H2S by enhancing antioxidant defense systems.


2004 ◽  
Vol 1 (3) ◽  
pp. 297-305 ◽  
Author(s):  
ALASTAIR WILKINS ◽  
MARIA NIKODEMOVA ◽  
ALASTAIR COMPSTON ◽  
IAN DUNCAN

Minocycline, a tetracycline derivative with pleiotropic biological effects, exhibits anti-inflammatory properties in several models of CNS disease. In addition to reducing production of inflammatory mediators, it has been postulated that minocycline might also be directly neuroprotective under these circumstances. Therefore, we investigated the effect of minocycline on primary cortical neuronal cultures exposed to a nitric oxide (NO)-donor. Cultures were assessed for neuronal survival, axon survival and markers of intracellular signaling pathways. The NO donor significantly increased neuronal death and minocycline was protective under these conditions. Furthermore NO-induced reductions in axonal length were significantly attenuated by minocycline. Improvements in axonal length were dependent on mitogen-activated protein kinase (MAP kinase)/extracellular signal-related kinase (Erk) signaling, whereas phosphatidylinositol 3-kinase (PI 3-kinase)/Akt signaling was important in neuronal survival. Further investigation into MAP kinase signaling pathways revealed inhibition of p38 MAP kinase and c-jun N-terminal kinase (JNK) signaling by minocycline. JNK pathways were activated by trophic factor-withdrawal and minocycline attenuated neuronal death induced by trophic withdrawal. These results indicate that, in addition to anti-inflammatory properties, minocycline has direct protective effects on neurons and provides further evidence for its use in disorders of the CNS.


Antioxidants ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 748
Author(s):  
Nicole Denoix ◽  
Oscar McCook ◽  
Sarah Ecker ◽  
Rui Wang ◽  
Christiane Waller ◽  
...  

The purpose of this review is to explore the parallel roles and interaction of hydrogen sulfide (H2S) and oxytocin (OT) in cardiovascular regulation and fluid homeostasis. Their interaction has been recently reported to be relevant during physical and psychological trauma. However, literature reports on H2S in physical trauma and OT in psychological trauma are abundant, whereas available information regarding H2S in psychological trauma and OT in physical trauma is much more limited. This review summarizes recent direct and indirect evidence of the interaction of the two systems and their convergence in downstream nitric oxide-dependent signaling pathways during various types of trauma, in an effort to better understand biological correlates of psychosomatic interdependencies.


Antioxidants ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 108
Author(s):  
Noushina Iqbal ◽  
Shahid Umar ◽  
Nafees A. Khan ◽  
Francisco J. Corpas

The involvement of nitric oxide (NO) and hydrogen sulfide (H2S) in countermanding heat-inhibited photosynthetic features were studied in wheat (Triticum aestivum L.). Heat stress (HS) was employed at 40 °C after establishment for 6 h daily, and then plants were allowed to recover at 25 °C and grown for 30 days. Glucose (Glc) content increased under HS and repressed plant photosynthetic ability, but the application of sodium nitroprusside (SNP, as NO donor) either alone or with sodium hydrosulfide (NaHS, as H2S donor) reduced Glc-mediated photosynthetic suppression by enhancing ascorbate-glutathione (AsA-GSH) metabolism and antioxidant system, which reduced oxidative stress with decreased H2O2 and TBARS content. Oxidative stress reduction or inhibiting Glc repression was maximum with combined SNP and NaHS treatment, which was substantiated by 2-4-carboxyphenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (cPTIO) and hypotaurine (HT), scavengers for NO and H2S, respectively. The scavenge of H2S reduced NO-mediated alleviation of HS suggesting of its downstream action in NO-mediated heat-tolerance. However, a simultaneous decrease of both (NO and H2S) led to higher Glc-mediated repression of photosynthesis and oxidative stress in terms of increased H2O2 content that was comparable to HS plants. Thus, NO and H2S cooperate to enhance photosynthesis under HS by reducing H2O2-induced oxidative stress and excess Glc-mediated photosynthetic suppression.


2016 ◽  
Vol 120 (2) ◽  
pp. 263-270 ◽  
Author(s):  
Gopi K. Kolluru ◽  
Priya K. Prasai ◽  
Amir M. Kaskas ◽  
Vijay Letchuman ◽  
Christopher B. Pattillo

Molecular oxygen (O2) is an essential component for survival and development. Variation in O2 levels leads to changes in molecular signaling and ultimately affects the physiological functions of many organisms. Nitric oxide (NO) and hydrogen sulfide (H2S) are two gaseous cellular signaling molecules that play key roles in several physiological functions involved in maintaining vascular homeostasis including vasodilation, anti-inflammation, and vascular growth. Apart from the aforementioned functions, NO and H2S are believed to mediate hypoxic responses and serve as O2 chemosensors in biological systems. In this literature review, we briefly discuss NO and H2S and their roles during hypoxia.


2017 ◽  
Vol 312 (5) ◽  
pp. G450-G456 ◽  
Author(s):  
Amanda R. Jensen ◽  
Natalie A. Drucker ◽  
Sina Khaneki ◽  
Michael J. Ferkowicz ◽  
Troy A. Markel

Hydrogen sulfide (H2S) is an endogenous gasotransmitter that has vasodilatory properties. It may be a novel therapy for intestinal ischemia-reperfusion (I/R) injury. We hypothesized that 1) H2S would improve postischemic survival, mesenteric perfusion, mucosal injury, and inflammation compared with vehicle and 2) the benefits of H2S would be mediated through endothelial nitric oxide. C57BL/6J wild-type and endothelial nitric oxide synthase knockout (eNOS KO) mice were anesthetized, and a midline laparotomy was performed. Intestines were eviscerated, the small bowel mesenteric root identified, and baseline intestinal perfusion was determined using laser Doppler. Intestinal ischemia was established by temporarily occluding the superior mesenteric artery. Following ischemia, the clamp was removed, and the intestines were allowed to recover. Either sodium hydrosulfide (2 nmol/kg or 2 µmol/kg NaHS) in PBS vehicle or vehicle only was injected into the peritoneum. Animals were allowed to recover and were assessed for mesenteric perfusion, mucosal injury, and intestinal cytokines. P values < 0.05 were significant. H2S improved mesenteric perfusion and mucosal injury scores following I/R injury. However, in the setting of eNOS ablation, there was no improvement in these parameters with H2S therapy. Application of H2S also resulted in lower levels of intestinal cytokine production following I/R. Intraperitoneal H2S therapy can improve mesenteric perfusion, intestinal mucosal injury, and intestinal inflammation following I/R. The benefits of H2S appear to be mediated through endothelial nitric oxide-dependent pathways. NEW & NOTEWORTHY H2S is a gaseous mediator that acts as an anti-inflammatory agent contributing to gastrointestinal mucosal defense. It promotes vascular dilation, mucosal repair, and resolution of inflammation following intestinal ischemia and may be exploited as a novel therapeutic agent. It is unclear whether H2S works through nitric oxide-dependent pathways in the intestine. We appreciate that H2S was able to improve postischemic recovery of mesenteric perfusion, mucosal integrity, and inflammation. The beneficial effects of H2S appear to be mediated through endothelial nitric oxide-dependent pathways.


2020 ◽  
Vol 9 (13) ◽  
Author(s):  
Hanan Qasim ◽  
Bradley K. McConnell

Abstract Heart failure is a complex clinical syndrome, represented as an impairment in ventricular filling and myocardial blood ejection. As such, heart failure is one of the leading causes of death in the United States. With a mortality rate of 1 per 8 individuals and a prevalence of 6.2 million Americans, it has been projected that heart failure prevalence will increase by 46% by 2030. Cardiac remodeling (a general determinant of heart failure) is regulated by an extensive network of intertwined intracellular signaling pathways. The ability of signalosomes (molecular signaling complexes) to compartmentalize several cellular pathways has been recently established. These signalosome signaling complexes provide an additional level of specificity to general signaling pathways by regulating the association of upstream signals with downstream effector molecules. In cardiac myocytes, the AKAP12 (A‐kinase anchoring protein 12) scaffolds a large signalosome that orchestrates spatiotemporal signaling through stabilizing pools of phosphatases and kinases. Predominantly upon β‐AR (β 2 ‐adrenergic‐receptor) stimulation, the AKAP12 signalosome is recruited near the plasma membrane and binds tightly to β‐AR. Thus, one major function of AKAP12 is compartmentalizing PKA (protein kinase A) signaling near the plasma membrane. In addition, it is involved in regulating desensitization, downregulation, and recycling of β‐AR. In this review, the critical roles of AKAP12 as a scaffold protein in mediating signaling downstream GPCRs (G protein–coupled receptor) are discussed with an emphasis on its reported and potential roles in cardiovascular disease initiation and progression.


Sign in / Sign up

Export Citation Format

Share Document