scholarly journals Oxygen tension, H2S, and NO bioavailability: is there an interaction?

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.

2016 ◽  
Vol 62 (1) ◽  
pp. 93-104 ◽  
Author(s):  
Larisse Tavares Lucetti ◽  
Renan Oliveira Silva ◽  
Ana Paula Macedo Santana ◽  
Bruno de Melo Tavares ◽  
Mariana Lima Vale ◽  
...  

2015 ◽  
Vol 148 (4) ◽  
pp. S-315 ◽  
Author(s):  
Larisse T. Lucetti ◽  
Ana Paula M. Santana ◽  
Bruno D. Tavares ◽  
Ronaldo A. Ribeiro ◽  
Pedro Marcos G. Soares ◽  
...  

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.


2019 ◽  
pp. 1213-1247 ◽  
Author(s):  
Saranya Rajendran ◽  
Xinggui Shen ◽  
John Glawe ◽  
Gopi K. Kolluru ◽  
Christopher G. Kevil

2016 ◽  
pp. 43-47
Author(s):  
O.V. Basystyi ◽  

The data of domestic and foreign literature on etiology, pathogenesis and intrauterine growth retardation diagnosis are presented in the paper. It highlights pathogenetic role of nitric oxide deficiency in case of obstetric complications and intrauterine growth retardation. Key words: intrauterine growth retardation (IUGR), system L-arginin–NO, obstetric complications.


2019 ◽  
Vol 72 (8) ◽  
pp. 1473-1476
Author(s):  
Nataliya Matolinets ◽  
Helen Sklyarova ◽  
Eugene Sklyarov ◽  
Andrii Netliukh

Introduction: Polytrauma patients have high risk of shock, septic complications and death during few years of follow-up. In recent years a lot of attention is paid to gaseous transmitters, among which are nitrogen oxide (NO) and hydrogen sulfide (H2S). It is known that the rise of NO and its metabolites levels occurs during the acute period of polytrauma. Nitric oxide and hydrogen sulfide are produced in different cell types, among which are lymphocytes. The aim: To investigate the levels of NO, NOS, iNOS, еNOS, H2S in lymphocytes lysate in patients at the moment of hospitalization and 24 hours after trauma. Materials and methods: We investigated the levels of NO, NO-synthase, inducible NO-synthase, endothelial NO-synthase, H2S in lymphocytes lysate in patients at the moment of hospitalization and 24 hours after trauma. Results: The study included 20 patients with polytrauma who were treated in the intensive care unit (ICU) of the Lviv Emergency Hospital. Tissue injury was associated with an increased production of NO, NOS, iNOS, еNOS during the acute period of polytrauma. At the same time, the level of H2S decreased by the end of the first day of traumatic injury. Conclusions: In acute period of polytrauma, significant increasing of iNOS and eNOS occurs with percentage prevalence of iNOS over eNOS on the background of H2S decreasing.


2020 ◽  
Vol 16 ◽  
Author(s):  
Andrey Krylatov ◽  
Leonid Maslov ◽  
Sergey Y. Tsibulnikov ◽  
Nikita Voronkov ◽  
Alla Boshchenko ◽  
...  

: There is considerable evidence in the heart that autophagy in cardiomyocytes is activated by hypoxia/reoxygenation (H/R) or in hearts by ischemia/reperfusion (I/R). Depending upon the experimental model and duration of ischemia, increases in autophagy in this setting maybe beneficial (cardioprotective) or deleterious (exacerbate I/R injury). Aside from the conundrum as to whether or not autophagy is an adaptive process, it is clearly regulated by a number of diverse molecules including reactive oxygen species (ROS), various kinases, hydrogen sulfide (H2S) and nitric oxide (NO). The purpose this review is to address briefly the controversy regarding the role of autophagy in this setting and to examine a variety of disparate molecules that are involved in its regulation.


2018 ◽  
Vol 17 (9) ◽  
pp. 654-670 ◽  
Author(s):  
Mohit Kumar ◽  
Rajat Sandhir

Background & Objective: Hydrogen sulfide [H2S] has been widely known as a toxic gas for more than 300 years in the scientific community. However, the understanding about this small molecule has changed after the discovery of involvement of H2S in physiological and pathological mechanisms in brain. H2S is a third gasotransmitter and neuromodulator after carbon monoxide [CO] and nitric oxide [NO]. H2S plays an important role in memory and cognition by regulating long-term potentiation [LTP] and calcium homeostasis in neuronal cells. The disturbances in endogenous H2S levels and trans-sulfuration pathway have been implicated in neurodegenerative disorders like Alzheimer’s disease, Parkinson disease, stroke and traumatic brain injury. According to the results obtained from various studies, H2S not only behaves as neuromodulator but also is a potent antioxidant, anti-inflammatory and anti-apoptotic molecule suggesting its neuroprotective potential. Conclusion: Recently, there is an increased interest in developing H2S releasing pharmaceuticals to target various neurological disorders. This review covers the information about the involvement of H2S in neurodegenerative diseases, its molecular targets and its role as potential therapeutic molecule.


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