1
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Derry PJ, Liopo AV, Mouli K, McHugh EA, Vo ATT, McKelvey A, Suva LJ, Wu G, Gao Y, Olson KR, Tour JM, Kent TA. Oxidation of Hydrogen Sulfide to Polysulfide and Thiosulfate by a Carbon Nanozyme: Therapeutic Implications with an Emphasis on Down Syndrome. Adv Mater 2024; 36:e2211241. [PMID: 37272655 PMCID: PMC10696138 DOI: 10.1002/adma.202211241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 05/20/2023] [Indexed: 06/06/2023]
Abstract
Hydrogen sulfide (H2 S) is a noxious, potentially poisonous, but necessary gas produced from sulfur metabolism in humans. In Down Syndrome (DS), the production of H2 S is elevated and associated with degraded mitochondrial function. Therefore, removing H2 S from the body as a stable oxide could be an approach to reducing the deleterious effects of H2 S in DS. In this report we describe the catalytic oxidation of hydrogen sulfide (H2 S) to polysulfides (HS2+n - ) and thiosulfate (S2 O3 2- ) by poly(ethylene glycol) hydrophilic carbon clusters (PEG-HCCs) and poly(ethylene glycol) oxidized activated charcoal (PEG-OACs), examples of oxidized carbon nanozymes (OCNs). We show that OCNs oxidize H2 S to polysulfides and S2 O3 2- in a dose-dependent manner. The reaction is dependent on O2 and the presence of quinone groups on the OCNs. In DS donor lymphocytes we found that OCNs increased polysulfide production, proliferation, and afforded protection against additional toxic levels of H2 S compared to untreated DS lymphocytes. Finally, in Dp16 and Ts65DN murine models of DS, we found that OCNs restored osteoclast differentiation. This new action suggests potential facile translation into the clinic for conditions involving excess H2 S exemplified by DS.
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Affiliation(s)
- Paul J Derry
- Center for Genomic and Precision Medicine, Department of Translational Medical Science, Institute of Bioscience and Technology, Texas A&M Health Science Center, 2121 W. Holcombe Boulevard, Houston, Texas, USA
- EnMed, School of Engineering Medicine, Texas A&M University, 1020 W. Holcombe Boulevard, Houston, Texas, USA
| | - Anton V Liopo
- Center for Genomic and Precision Medicine, Department of Translational Medical Science, Institute of Bioscience and Technology, Texas A&M Health Science Center, 2121 W. Holcombe Boulevard, Houston, Texas, USA
- Department of Chemistry, Rice University, Houston, 77005, Texas, USA
| | - Karthik Mouli
- Center for Genomic and Precision Medicine, Department of Translational Medical Science, Institute of Bioscience and Technology, Texas A&M Health Science Center, 2121 W. Holcombe Boulevard, Houston, Texas, USA
| | - Emily A McHugh
- Department of Chemistry, Rice University, Houston, 77005, Texas, USA
- Smalley-Curl Institute, Rice University, Houston, 77005, Texas, USA
| | - Anh T T Vo
- Center for Genomic and Precision Medicine, Department of Translational Medical Science, Institute of Bioscience and Technology, Texas A&M Health Science Center, 2121 W. Holcombe Boulevard, Houston, Texas, USA
| | - Ann McKelvey
- Center for Inflammation and Infectious Disease, Department of Translational Medical Science, Institute of Bioscience and Technology, Texas A&M Health Science Center, 2121 W. Holcombe Boulevard, Houston, 77030, Texas, USA
| | - Larry J Suva
- Department of Veterinary Physiology and Pharmacology, School of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, 77843, Texas, USA
| | - Gang Wu
- Division of Hematology, Internal Medicine, John P. and Kathrine G. McGovern Medical School at UTHealth Houston, Houston, 77005, Texas, USA
| | - Yan Gao
- Indiana University School of Medicine-South Bend, South Bend, 46617, Indiana, USA
| | - Kenneth R Olson
- Indiana University School of Medicine-South Bend, South Bend, 46617, Indiana, USA
| | - James M Tour
- Department of Chemistry, Rice University, Houston, 77005, Texas, USA
- Smalley-Curl Institute, Rice University, Houston, 77005, Texas, USA
- Welch Institute for Advanced Materials, Rice University, Houston, 77005, Texas, USA
- The NanoCarbon Center, Rice University, Houston, 77005, Texas, USA
| | - Thomas A Kent
- Center for Genomic and Precision Medicine, Department of Translational Medical Science, Institute of Bioscience and Technology, Texas A&M Health Science Center, 2121 W. Holcombe Boulevard, Houston, Texas, USA
- Department of Chemistry, Rice University, Houston, 77005, Texas, USA
- Stanley H. Appel Department of Neurology, Houston Methodist Hospital and Research Institute, 6560 Fannin Street, Houston, 77030, Texas, USA
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2
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Olson KR. Always enough but never too much: the how and why of downregulating tissue oxygenation. Am J Physiol Heart Circ Physiol 2023; 325:H888-H891. [PMID: 37624098 DOI: 10.1152/ajpheart.00449.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 08/24/2023] [Accepted: 08/24/2023] [Indexed: 08/26/2023]
Abstract
Cardiovascular regulation of tissue oxygenation is generally viewed as an anti-drop process that prevents tissue oxygen concentration from falling below some minimum. I propose that cardiovascular regulation is predominately an anti-rise process designed to downregulate oxygen delivery. This maintains an evolutionarily conserved, reduced intracellular environment to prevent oxidation of redox-sensitive regulatory protein thiols. A number of points support this hypothesis. First, oxygen is the only nutrient with a positive, fourfold diffusion gradient from the environment to systemic tissues, minimizing the likelihood that oxygen delivery is limited. Second, hemoglobin (Hb) retains oxygen unless offloading is absolutely necessary. The allosteric properties of Hb keep oxygen tightly bound until absolutely needed, and the Bohr shift, which favors offloading, is only transient and lost when metabolism is restored. Third, a myoglobin-like Hb (xHb) would offload all of its oxygen and could easily have evolved, but it did not. Fourth, oxygen-sensitive vasoconstrictors and hyperoxic-rarefaction prevent acute and chronic over perfusion. Fifth, Fåhraeus and Fåhraeus-Lindqvist effects reduce capillary hematocrit to minimize microcirculatory oxygen content. Sixth, venous blood remains 75% saturated, wasting 75% of cardiac output were an oxygen reserve not needed. Finally, xHb-containing red blood cells could be considerably smaller and thereby decrease Fåhraeus and Fåhraeus-Lindqvist effects and cardiac load. In summary, the capacity of the cardiovascular system to deliver oxygen to the tissues generally exceeds demand, and although maintenance of an oxygen delivery reserve is important, it is more important to prevent excess oxygen delivery.
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Affiliation(s)
- Kenneth R Olson
- Department of Physiology, Indiana University School of Medicine-South Bend, South Bend, Indiana, United States
- Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, United States
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3
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Olson KR, Clear KJ, Gao Y, Ma Z, Cieplik NM, Fiume AR, Gaziano DJ, Kasko SM, Luu J, Pfaff E, Travlos A, Velander C, Wilson KJ, Edwards ED, Straub KD, Wu G. Redox and Nucleophilic Reactions of Naphthoquinones with Small Thiols and Their Effects on Oxidization of H 2S to Inorganic and Organic Hydropolysulfides and Thiosulfate. Int J Mol Sci 2023; 24:ijms24087516. [PMID: 37108682 PMCID: PMC10138938 DOI: 10.3390/ijms24087516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 04/10/2023] [Accepted: 04/13/2023] [Indexed: 04/29/2023] Open
Abstract
Naphthoquinone (1,4-NQ) and its derivatives (NQs, juglone, plumbagin, 2-methoxy-1,4-NQ, and menadione) have a variety of therapeutic applications, many of which are attributed to redox cycling and the production of reactive oxygen species (ROS). We previously demonstrated that NQs also oxidize hydrogen sulfide (H2S) to reactive sulfur species (RSS), potentially conveying identical benefits. Here we use RSS-specific fluorophores, mass spectroscopy, EPR and UV-Vis spectrometry, and oxygen-sensitive optodes to examine the effects of thiols and thiol-NQ adducts on H2S-NQ reactions. In the presence of glutathione (GSH) and cysteine (Cys), 1,4-NQ oxidizes H2S to both inorganic and organic hydroper-/hydropolysulfides (R2Sn, R=H, Cys, GSH; n = 2-4) and organic sulfoxides (GSnOH, n = 1, 2). These reactions reduce NQs and consume oxygen via a semiquinone intermediate. NQs are also reduced as they form adducts with GSH, Cys, protein thiols, and amines. Thiol, but not amine, adducts may increase or decrease H2S oxidation in reactions that are both NQ- and thiol-specific. Amine adducts also inhibit the formation of thiol adducts. These results suggest that NQs may react with endogenous thiols, including GSH, Cys, and protein Cys, and that these adducts may affect both thiol reactions as well as RSS production from H2S.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine-South Bend, South Bend, IN 46617, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Kasey J Clear
- Department of Chemistry and Biochemistry, Indiana University South Bend, South Bend, IN 46615, USA
| | - Yan Gao
- Indiana University School of Medicine-South Bend, South Bend, IN 46617, USA
| | - Zhilin Ma
- Indiana University School of Medicine-South Bend, South Bend, IN 46617, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Nathaniel M Cieplik
- Indiana University School of Medicine-South Bend, South Bend, IN 46617, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Alyssa R Fiume
- Indiana University School of Medicine-South Bend, South Bend, IN 46617, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Dominic J Gaziano
- Indiana University School of Medicine-South Bend, South Bend, IN 46617, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Stephen M Kasko
- Indiana University School of Medicine-South Bend, South Bend, IN 46617, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Jennifer Luu
- Indiana University School of Medicine-South Bend, South Bend, IN 46617, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Ella Pfaff
- Indiana University School of Medicine-South Bend, South Bend, IN 46617, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Anthony Travlos
- Indiana University School of Medicine-South Bend, South Bend, IN 46617, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Cecilia Velander
- Indiana University School of Medicine-South Bend, South Bend, IN 46617, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Katherine J Wilson
- Indiana University School of Medicine-South Bend, South Bend, IN 46617, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Elizabeth D Edwards
- Department of Chemistry and Biochemistry, Indiana University South Bend, South Bend, IN 46615, USA
| | - Karl D Straub
- Central Arkansas Veteran's Healthcare System, Little Rock, AR 72205, USA
- Departments of Medicine and Biochemistry, University of Arkansas for Medical Sciences, Little Rock, AR 72202, USA
| | - Gang Wu
- Department of Internal Medicine, The University of Texas-McGovern Medical School, Houston, TX 77030, USA
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4
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Olson KR, Derry PJ, Kent TA, Straub KD. The Effects of Antioxidant Nutraceuticals on Cellular Sulfur Metabolism and Signaling. Antioxid Redox Signal 2023; 38:68-94. [PMID: 35819295 PMCID: PMC9885552 DOI: 10.1089/ars.2022.0077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 06/23/2022] [Indexed: 02/03/2023]
Abstract
Significance: Nutraceuticals are ingested for health benefits, in addition to their general nutritional value. These dietary supplements have become increasingly popular since the late 20th century and they are a rapidly expanding global industry approaching a half-trillion U.S. dollars annually. Many nutraceuticals are promulgated as potent antioxidants. Recent Advances: Experimental support for the efficacy of nutraceuticals has lagged behind anecdotal exuberance. However, accumulating epidemiological evidence and recent, well-controlled clinical trials are beginning to support earlier animal and in vitro studies. Although still somewhat limited, encouraging results have been suggested in essentially all organ systems and against a wide range of pathophysiological conditions. Critical Issues: Health benefits of "antioxidant" nutraceuticals are largely attributed to their ability to scavenge oxidants. This has been criticized based on several factors, including limited bioavailability, short tissue retention time, and the preponderance of endogenous antioxidants. Recent attention has turned to nutraceutical activation of downstream antioxidant systems, especially the Keap1/Nrf2 (Kelch like ECH associated protein 1/nuclear factor erythroid 2-related factor 2) axis. The question now becomes, how do nutraceuticals activate this axis? Future Directions: Reactive sulfur species (RSS), including hydrogen sulfide (H2S) and its metabolites, are potent activators of the Keap1/Nrf2 axis and avid scavengers of reactive oxygen species. Evidence is beginning to accumulate that a variety of nutraceuticals increase cellular RSS by directly providing RSS in the diet, or through a number of catalytic mechanisms that increase endogenous RSS production. We propose that nutraceutical-specific targeting of RSS metabolism will lead to the design and development of even more efficacious antioxidant therapeutic strategies. Antioxid. Redox Signal. 38, 68-94.
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Affiliation(s)
- Kenneth R. Olson
- Department of Physiology, Indiana University School of Medicine—South Bend, South Bend, Indiana, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, USA
| | - Paul J. Derry
- Center for Genomics and Precision Medicine, Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, Texas, USA
| | - Thomas A. Kent
- Center for Genomics and Precision Medicine, Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, Texas, USA
- Department of Chemistry, Rice University, Houston, Texas, USA
- Stanley H. Appel Department of Neurology, Houston Methodist Hospital and Research Institute, Houston, Texas, USA
| | - Karl D. Straub
- Central Arkansas Veteran's Healthcare System, Little Rock, Arkansas, USA
- Department of Medicine and Biochemistry, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
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5
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Olson KR, Clear KJ, Derry PJ, Gao Y, Ma Z, Wu G, Kent TA, Straub KD. Coenzyme Q 10 and related quinones oxidize H 2S to polysulfides and thiosulfate. Free Radic Biol Med 2022; 182:119-131. [PMID: 35202787 DOI: 10.1016/j.freeradbiomed.2022.02.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Revised: 02/03/2022] [Accepted: 02/18/2022] [Indexed: 12/11/2022]
Abstract
In the canonical pathway for mitochondrial H2S oxidation electrons are transferred from sulfide:quinone oxidoreductase (SQR) to complex III via ubiquinone (CoQ10). We previously observed that a number of quinones directly oxidize H2S and we hypothesize that CoQ10 may have similar properties. Here we examine H2S oxidation by CoQ10 and more hydrophilic, truncated forms, CoQ1 and CoQ0, in buffer using H2S and polysulfide fluorophores (AzMC and SSP4), silver nanoparticles to measure thiosulfate (H2S2O3), mass spectrometry to identify polysulfides and O2-sensitive optodes to measure O2 consumption. We show that all three quinones concentration-dependently catalyze the oxidization of H2S to polysulfides and thiosulfate in buffer with the potency CoQ0>CoQ1>CoQ10 and that CoQ0 specifically oxidizes H2S to per-polysulfides, H2S2,3,4. These reactions consume and require oxygen and are augmented by addition of SOD suggesting that the quinones, not superoxide, oxidize H2S. Related quinones, MitoQ, menadione and idebenone, oxidize H2S in similar reactions. Exogenous CoQ0 decreases cellular H2S and increases polysulfides and thiosulfate production and this is also O2-dependent, suggesting that the quinone has similar effects on sulfur metabolism in cells. Collectively, these results suggest an additional endogenous mechanism for H2S metabolism and a potential therapeutic approach in H2S-related metabolic disorders.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA.
| | - Kasey J Clear
- Department of Chemistry and Biochemistry, Indiana University South Bend, South Bend, IN, 46615, USA
| | - Paul J Derry
- Department of Internal Medicine, University of Texas - McGovern Medical School at Houston, Houston, TX, 77030, USA
| | - Yan Gao
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA
| | - Zhilin Ma
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Gang Wu
- Department of Internal Medicine, University of Texas - McGovern Medical School at Houston, Houston, TX, 77030, USA
| | - Thomas A Kent
- Center for Genomics and Precision Medicine, Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, TX, 77030, USA; Department of Chemistry, Rice University, Houston, TX, 77005, United States; Stanley H. Appel Department of Neurology, Houston Methodist Hospital and Research Institute, 6560 Fannin Street, Houston, TX, 77030, United States
| | - Karl D Straub
- Central Arkansas Veteran's Healthcare System, Little Rock, AR, 72205, USA; Departments of Medicine and Biochemistry, University of Arkansas for Medical Sciences, Little Rock, AR, 72202, USA
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6
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Derry PJ, Liopo A, McKelvey A, Vo A, Gnanasekaran A, McHugh E, Tour JM, Olson KR, Kent T. Abstract WP253: Increased Hydrogen Sulfide As A New Mechanism For Hyperglycemic Worsening Of Stroke Outcome. Stroke 2022. [DOI: 10.1161/str.53.suppl_1.wp253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Introduction:
Hyperglycemia at stroke onset worsens outcome and reduces the effectiveness of reperfusion therapies. Increased oxidative and mitochondrial injury likely contribute. To treat this mechanism, we synthesized (PEG)-ylated carbon nanoparticles (CNPs) from acid oxidation of activated charcoal (OAC) generating 3 nm discs, catalytic superoxide dismutase mimetics that protect mitochondrial complexes. Cellular uptake is rapid and delayed I.V. PEG-CNPs are highly protective in reversible MCAO in hyperglycemic rats. Hydrogen sulfide (H
2
S) is an essential gaseous transmitter with a narrow therapeutic index associated with many disorders e.g., diabetes. Its synthesis is influenced by radicals. Excess H
2
S is toxic to mitochondrial complex IV. H
2
S is endogenously oxidized to polysulfides (PS), potent antioxidants also needed for protein persulfidation. We hypothesized that OAC’s favorable redox potential will catalyze H
2
S oxidization to PS, acute hyperglycemia will increase H
2
S and PEG-OACs will blunt the increase.
Methods:
b.End3 brain endothelial and HEK293 cultured cells were employed. SSP4 fluorescence measured PS levels with increasing concentrations of PEG-OACs. AzMC fluorescence detected H
2
S levels in cells incubated in 100 mg/dL glucose media followed by glucose 500 mg/dL with or without PEG-OACs, first in normoxia followed by anoxia/normoxia.
Results:
PEG-OACs dose dependently increased cellular PS levels (Fig 1a). High glucose increased H
2
S levels especially during anoxia/normoxia (Fig 1b). PEG-OACs completely eliminated the glucose-induced increase in H
2
S (Fig 1c).
Conclusions:
Acute hyperglycemia increased H
2
S production especially under conditions mimicking ischemia/reperfusion, an effect eliminated by PEG-OACs. Because of mitochondrial toxicity, an H
2
S increase may contribute to worsened outcome in hyperglycemic stroke. These results suggest a new therapeutic target for this important cause of poor stroke outcome.
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Affiliation(s)
- Paul J Derry
- Translational Med Sciences, TAMU Health Science Cntr, Houston, TX
| | - Anton Liopo
- Translational Med Sciences, TAMU Health Science Cntr, Houston, TX
| | - Ann McKelvey
- Translational Med Sciences, TAMU Health Science Cntr, Houston, TX
| | - Anh Vo
- Translational Med Sciences, TAMU Health Science Cntr, Houston, TX
| | | | | | | | - Kenneth R Olson
- Dept of Biological Sciences, Univ of Notre Dame, Notre Dame, IN
| | - Thomas Kent
- Translational Med Sciences, TAMU Health Science Cntr, Houston, TX
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7
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Olson KR. A Case for Hydrogen Sulfide Metabolism as an Oxygen Sensing Mechanism. Antioxidants (Basel) 2021; 10:antiox10111650. [PMID: 34829521 PMCID: PMC8615108 DOI: 10.3390/antiox10111650] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/08/2021] [Accepted: 10/13/2021] [Indexed: 12/30/2022] Open
Abstract
The ability to detect oxygen availability is a ubiquitous attribute of aerobic organisms. However, the mechanism(s) that transduce oxygen concentration or availability into appropriate physiological responses is less clear and often controversial. This review will make the case for oxygen-dependent metabolism of hydrogen sulfide (H2S) and polysulfides, collectively referred to as reactive sulfur species (RSS) as a physiologically relevant O2 sensing mechanism. This hypothesis is based on observations that H2S and RSS metabolism is inversely correlated with O2 tension, exogenous H2S elicits physiological responses identical to those produced by hypoxia, factors that affect H2S production or catabolism also affect tissue responses to hypoxia, and that RSS efficiently regulate downstream effectors of the hypoxic response in a manner consistent with a decrease in O2. H2S-mediated O2 sensing is then compared to the more generally accepted reactive oxygen species (ROS) mediated O2 sensing mechanism and a number of reasons are offered to resolve some of the confusion between the two.
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Affiliation(s)
- Kenneth R Olson
- Department of Physiology, Indiana University School of Medicine-South Bend, South Bend, IN 46617, USA
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8
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Olson KR, Gao Y, Briggs A, Devireddy M, Iovino NA, Licursi M, Skora NC, Whelan J, Villa BP, Straub KD. 'Antioxidant' berries, anthocyanins, resveratrol and rosmarinic acid oxidize hydrogen sulfide to polysulfides and thiosulfate: A novel mechanism underlying their biological actions. Free Radic Biol Med 2021; 165:67-78. [PMID: 33508425 DOI: 10.1016/j.freeradbiomed.2021.01.035] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 01/03/2021] [Accepted: 01/17/2021] [Indexed: 12/12/2022]
Abstract
Nutraceutical polyphenol catechins in green tea oxidize H2S to polysulfides (PS) in buffer and in cells thereby conveying their cytoprotective effects. Here we measure H2S oxidation in buffer and HEK293 cells by over-the-counter nutraceuticals, blueberry, bilberry and cranberry, and by polyphenols, cyanadin (Cya), quercetin (Que), rosmarinic acid (RA) and resveratrol (Res). H2S and PS were measured with specific fluorophores, AzMc and SSP4 respectively, and thiosulfate (TS) production was measured in buffer using silver nanoparticles (AgNPs). All compounds increased polysulfide production from H2S in buffer and increased polysufides in cells. Decreasing oxygen from 100% to 21% and 0% progressively decreased PS production by Que and RA in buffer and Que decreased PS production in cells incubated in 5% O2 compared to 21% O2. Que, RA and Res, but not Cya, increased TS production from H2S in 21% O2 but not in 0% O2. Superoxide dismutase did not affect PS production from H2S by Que or TS production from H2S by Que, RA or Res, whereas catalase inhibited TS production by all three polyphenols. Conversely, these polyphenols only slightly reduce a mixed polysulfide (K2Sn) or thiosulfate to H2S in 0% O2. Collectively, our results suggest that polyphenols are autoxidized to a semiquinone radical and that this, in turn, oxidizes H2S to a thiyl radical from which polysulfides and thiosulfate derived. They also suggest that this is catalyzed by a semiquinone radical and it is independent of either superoxide or hydrogen peroxide concomitantly produced during polyphenol autoxidation. The polysulfides produced in these reactions are potent antioxidants and also initiate a variety of downstream cytoprotective effector mechanisms. It is also possible that H2S can be regenerated from the thiosulfate produced in these reactions by other cellular reductants and reused in subsequent reactions.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA.
| | - Yan Gao
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA
| | - Austin Briggs
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Monesh Devireddy
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA
| | - Nicholas A Iovino
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Matthew Licursi
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Nicole C Skora
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Jenna Whelan
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Brian P Villa
- Indiana University School of Medicine - South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Karl D Straub
- Central Arkansas Veteran's Healthcare System, Little Rock, AR, 72205, USA; Departments of Medicine and Biochemistry, University of Arkansas for Medical Sciences, Little Rock, AR, 72202, USA
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9
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Abstract
Significance: Oxidative stress in moderation positively affects homeostasis through signaling, while in excess it is associated with adverse health outcomes. Both activities are generally attributed to reactive oxygen species (ROS); hydrogen peroxide as the signal, and cysteines on regulatory proteins as the target. However, using antioxidants to affect signaling or benefit health has not consistently translated into expected outcomes, or when it does, the mechanism is often unclear. Recent Advances: Reactive sulfur species (RSS) were integral in the origin of life and throughout much of evolution. Sophisticated metabolic pathways that evolved to regulate RSS were easily "tweaked" to deal with ROS due to the remarkable similarities between the two. However, unlike ROS, RSS are stored, recycled, and chemically more versatile. Despite these observations, the relevance and regulatory functions of RSS in extant organisms are generally underappreciated. Critical Issues: A number of factors bias observations in favor of ROS over RSS. Research conducted in room air is hyperoxic to cells, and promotes ROS production and RSS oxidation. Metabolic rates of rodent models greatly exceed those of humans; does this favor ROS? Analytical methods designed to detect ROS also respond to RSS. Do these disguise the contributions of RSS? Future Directions: Resolving the ROS/RSS issue is vital to understand biology in general and human health in particular. Improvements in experimental design and analytical methods are crucial. Perhaps the most important is an appreciation of all the attributes of RSS and keeping an open mind.
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Affiliation(s)
- Kenneth R Olson
- Department of Physiology, Indiana University School of Medicine-South Bend, South Bend, Indiana, USA
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Olson KR, Briggs A, Devireddy M, Iovino NA, Skora NC, Whelan J, Villa BP, Yuan X, Mannam V, Howard S, Gao Y, Minnion M, Feelisch M. Green tea polyphenolic antioxidants oxidize hydrogen sulfide to thiosulfate and polysulfides: A possible new mechanism underpinning their biological action. Redox Biol 2020; 37:101731. [PMID: 33002760 PMCID: PMC7527747 DOI: 10.1016/j.redox.2020.101731] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 08/11/2020] [Accepted: 09/12/2020] [Indexed: 12/13/2022] Open
Abstract
Matcha and green tea catechins such as (−)-epicatechin (EC), (−)-epigallocatechin (EGC) and (−)-epigallocatechin gallate (EGCG) have long been studied for their antioxidant and health-promoting effects. Using specific fluorophores for H2S (AzMC) and polysulfides (SSP4) as well as IC-MS and UPLC-MS/MS-based techniques we here show that popular Japanese and Chinese green teas and select catechins all catalytically oxidize hydrogen sulfide (H2S) to polysulfides with the potency of EGC > EGCG >> EG. This reaction is accompanied by the formation of sulfite, thiosulfate and sulfate, consumes oxygen and is partially inhibited by the superoxide scavenger, tempol, and superoxide dismutase but not mannitol, trolox, DMPO, or the iron chelator, desferrioxamine. We propose that the reaction proceeds via a one-electron autoxidation process during which one of the OH-groups of the catechin B-ring is autooxidized to a semiquinone radical and oxygen is reduced to superoxide, either of which can then oxidize HS− to thiyl radicals (HS•) which react to form hydrogen persulfide (H2S2). H2S oxidation reduces the B-ring back to the hydroquinone for recycling while the superoxide is reduced to hydrogen peroxide (H2O2). Matcha and catechins also concentration-dependently and rapidly produce polysulfides in HEK293 cells with the potency order EGCG > EGC > EG, an EGCG threshold of ~300 nM, and an EC50 of ~3 μM, suggesting green tea also acts as powerful pro-oxidant in vivo. The resultant polysulfides formed are not only potent antioxidants, but elicit a cascade of secondary cytoprotective effects, and we propose that many of the health benefits of green tea are mediated through these reactions. Remarkably, all green tea leaves constitutively contain small amounts of H2S2.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine - South Bend, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA.
| | - Austin Briggs
- Indiana University School of Medicine - South Bend, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Monesh Devireddy
- Indiana University School of Medicine - South Bend, South Bend, IN, 46617, USA
| | - Nicholas A Iovino
- Indiana University School of Medicine - South Bend, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Nicole C Skora
- Indiana University School of Medicine - South Bend, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Jenna Whelan
- Indiana University School of Medicine - South Bend, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Brian P Villa
- Indiana University School of Medicine - South Bend, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Xiaotong Yuan
- Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Varun Mannam
- Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Scott Howard
- Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Yan Gao
- Indiana University School of Medicine - South Bend, South Bend, IN, 46617, USA
| | - Magdalena Minnion
- NIHR Southampton Biomedical Research Center, University of Southampton, Southampton, General Hospital, Southampton, SO16 6YD, UK; Clinical & Experimental Sciences, Faculty of Medicine, Southampton General Hospital, University of Southampton, Southampton, SO16 6YD, UK
| | - Martin Feelisch
- NIHR Southampton Biomedical Research Center, University of Southampton, Southampton, General Hospital, Southampton, SO16 6YD, UK; Clinical & Experimental Sciences, Faculty of Medicine, Southampton General Hospital, University of Southampton, Southampton, SO16 6YD, UK.
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11
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Affiliation(s)
- Michael S. Hedrick
- Department of Biological Sciences, California State University, East Bay, Hayward, CA 94542, USA
| | - Kenneth R. Olson
- Department of Physiology, Indiana University School of Medicine, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Stanley S. Hillman
- Department of Biology, Portland State University, Portland, OR 97207, USA
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Markel TA, Drucker NA, Jensen AR, Olson KR. Human Mesenchymal Stem Cell Hydrogen Sulfide Production Critically Impacts the Release of Other Paracrine Mediators After Injury. J Surg Res 2020; 254:75-82. [PMID: 32417499 DOI: 10.1016/j.jss.2020.04.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 03/09/2020] [Accepted: 04/11/2020] [Indexed: 12/16/2022]
Abstract
BACKGROUND The use of mesenchymal stem cells (MSCs) for treatment during ischemia is novel. Hydrogen sulfide (H2S) is an important paracrine mediator that is released from MSCs to facilitate angiogenesis and vasodilation. Three enzymes, cystathionine-beta-synthase (CBS), cystathionine-gamma-lyase (CSE), and 3-mercaptopyruvate-sulfurtransferase (MPST), are mainly responsible for H2S production. However, it is unclear how these enzymes impact the production of other critical growth factors and chemokines. We hypothesized that the enzymes responsible for H2S production in human MSCs would also critically regulate other growth factors and chemokines. MATERIALS AND METHODS Human MSCs were transfected with CBS, MPST, CSE, or negative control small interfering RNA. Knockdown of enzymes was confirmed by polymerase chain reaction. Cells were plated in 12-well plates at 100,000 cells per well and stimulated with tumor necrosis factor-α (TNF-α; 50 ng/mL), lipopolysaccharide (LPS; 200 ng/mL), or 5% hypoxia for 24 h. Supernatants were collected, and cytokines measured by multiplex beaded assay. Data were compared with the Mann-Whitney U-test, and P < 0.05 was significant. RESULTS TNF-α, LPS, and hypoxia effectively stimulated MSCs. Granulocyte colony-stimulating factor (GCSF), epidermal growth factor, fibroblast growth factor, granulocyte/monocyte colony-stimulating factor (GMCSF), vascular endothelial growth factor, and interferon gamma-inducible protein 10 were all significantly elevated when CSE was knocked down during TNF-α stimulation (P < 0.05). Knockdown of MPST during LPS stimulation more readily increased GCSF and epidermal growth factor but decreased GMCSF (P < 0.05). CBS knockdown decreased production of GCSF, fibroblast growth factor, GMCSF, and vascular endothelial growth factor (P < 0.05) after hypoxia. CONCLUSIONS The enzymes that produce H2S in MSCs are also responsible for the production of other stem cell paracrine mediators under stressful stimuli. Therefore, reprogramming MSCs to endogenously produce more H2S as a therapeutic intervention could also critically impact other paracrine mediators, which may alter the desired beneficial effects.
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Affiliation(s)
- Troy A Markel
- Section of Pediatric Surgery, Department of Surgery, Indiana University School of Medicine, Indianapolis, Indiana; Riley Hospital for Children at Indiana University Health, Indianapolis, Indiana; Department of Physiology, Indiana University School of Medicine, South Bend, Indiana.
| | - Natalie A Drucker
- Section of Pediatric Surgery, Department of Surgery, Indiana University School of Medicine, Indianapolis, Indiana; Department of Physiology, Indiana University School of Medicine, South Bend, Indiana
| | - Amanda R Jensen
- Section of Pediatric Surgery, Department of Surgery, Indiana University School of Medicine, Indianapolis, Indiana; Department of Physiology, Indiana University School of Medicine, South Bend, Indiana
| | - Kenneth R Olson
- Section of Pediatric Surgery, Department of Surgery, Indiana University School of Medicine, Indianapolis, Indiana; Riley Hospital for Children at Indiana University Health, Indianapolis, Indiana; Department of Physiology, Indiana University School of Medicine, South Bend, Indiana
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13
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Olson KR, Gao Y, DeLeon ER, Markel TA, Drucker N, Boone D, Whiteman M, Steiger AK, Pluth MD, Tessier CR, Stahelin RV. Extended hypoxia-mediated H 2 S production provides for long-term oxygen sensing. Acta Physiol (Oxf) 2020; 228:e13368. [PMID: 31442361 DOI: 10.1111/apha.13368] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Revised: 08/16/2019] [Accepted: 08/18/2019] [Indexed: 12/23/2022]
Abstract
AIM Numerous studies have shown that H2 S serves as an acute oxygen sensor in a variety of cells. We hypothesize that H2 S also serves in extended oxygen sensing. METHODS Here, we compare the effects of extended exposure (24-48 hours) to varying O2 tensions on H2 S and polysulphide metabolism in human embryonic kidney (HEK 293), human adenocarcinomic alveolar basal epithelial (A549), human colon cancer (HTC116), bovine pulmonary artery smooth muscle, human umbilical-derived mesenchymal stromal (stem) cells and porcine tracheal epithelium (PTE) using sulphur-specific fluorophores and fluorometry or confocal microscopy. RESULTS All cells continuously produced H2 S in 21% O2 and H2 S production was increased at lower O2 tensions. Decreasing O2 from 21% to 10%, 5% and 1% O2 progressively increased H2 S production in HEK293 cells and this was partially inhibited by a combination of inhibitors of H2 S biosynthesis, aminooxyacetate, propargyl glycine and compound 3. Mitochondria appeared to be the source of much of this increase in HEK 293 cells. H2 S production in all other cells and PTE increased when O2 was lowered from 21% to 5% except for HTC116 cells where 1% O2 was necessary to increase H2 S, presumably reflecting the hypoxic environment in vivo. Polysulphides (H2 Sn , where n = 2-7), the key signalling metabolite of H2 S also appeared to increase in many cells although this was often masked by high endogenous polysulphide concentrations. CONCLUSION These results show that cellular H2 S is increased during extended hypoxia and they suggest this is a continuously active O2 -sensing mechanism in a variety of cells.
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Affiliation(s)
- Kenneth R. Olson
- Indiana University School of Medicine‐South Bend South Bend Indiana
| | - Yan Gao
- Indiana University School of Medicine‐South Bend South Bend Indiana
| | - Eric R. DeLeon
- Indiana University School of Medicine‐South Bend South Bend Indiana
- Department of Biological Sciences University of Notre Dame Notre Dame Indiana
| | - Troy A. Markel
- Indiana University School of Medicine Riley Hospital for Children at IU Health Indianapolis Indiana
| | - Natalie Drucker
- Indiana University School of Medicine Riley Hospital for Children at IU Health Indianapolis Indiana
| | - David Boone
- Indiana University School of Medicine‐South Bend South Bend Indiana
| | | | - Andrea K. Steiger
- Department of Chemistry and Biochemistry University of Oregon Eugene Oregon
| | - Michael D. Pluth
- Department of Chemistry and Biochemistry University of Oregon Eugene Oregon
| | | | - Robert V. Stahelin
- Department of Medicinal Chemistry and Molecular Pharmacology Purdue University West Lafayette Indiana
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Abstract
The biological effects of oxidants, especially reactive oxygen species (ROS), include signaling functions (oxidative eustress), initiation of measures to reduce elevated ROS (oxidative stress), and a cascade of pathophysiological events that accompany excessive ROS (oxidative distress). Although these effects have long been studied in animal models with perturbed ROS, their actions under physiological conditions are less clear. I propose that some of the apparent uncertainty may be due to confusion of ROS with endogenously generated reactive sulfur species (RSS). ROS and RSS are chemically similar, but RSS are more reactive and versatile, and can be stored and reused. Both ROS and RSS signal via oxidation reactions with protein cysteine sulfur and they produce identical effector responses, but RSS appear to be more effective. RSS in the form of persulfidated cysteines (Cys-S-S) are produced endogenously and co-translationally introduced into proteins, and there is increasing evidence that many cellular proteins are persulfidated. A number of practical factors have contributed to confusion between ROS and RSS, and these are discussed herein. Furthermore, essentially all endogenous antioxidant enzymes appeared shortly after life began, some 3.8 billion years ago, when RSS metabolism dominated evolution. This was long before the rise in ROS, 600 million years ago, and I propose that these same enzymes, with only minor modifications, still effectively metabolize RSS in extant organisms. I am not suggesting that all ROS are RSS; however, I believe that the relative importance of ROS and RSS in biological systems needs further consideration.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine-South Bend, Raclin Carmichael Hall, 1234 Notre Dame Avenue, South Bend, IN 46617, USA
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Olson KR, Gao Y, Steiger AK, Pluth MD, Tessier CR, Markel TA, Boone D, Stahelin RV, Batinic-Haberle I, Straubg KD. Effects of Manganese Porphyrins on Cellular Sulfur Metabolism. Molecules 2020; 25:molecules25040980. [PMID: 32098303 PMCID: PMC7070779 DOI: 10.3390/molecules25040980] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 02/12/2020] [Accepted: 02/19/2020] [Indexed: 12/18/2022] Open
Abstract
Manganese porphyrins (MnPs), MnTE-2-PyP5+, MnTnHex-2-PyP5+ and MnTnBuOE-2-PyP5+, are superoxide dismutase (SOD) mimetics and form a redox cycle between O2 and reductants, including ascorbic acid, ultimately producing hydrogen peroxide (H2O2). We previously found that MnPs oxidize hydrogen sulfide (H2S) to polysulfides (PS; H2Sn, n = 2–6) in buffer. Here, we examine the effects of MnPs for 24 h on H2S metabolism and PS production in HEK293, A549, HT29 and bone marrow derived stem cells (BMDSC) using H2S (AzMC, MeRho-AZ) and PS (SSP4) fluorophores. All MnPs decreased intracellular H2S production and increased intracellular PS. H2S metabolism and PS production were unaffected by cellular O2 (5% versus 21% O2), H2O2 or ascorbic acid. We observed with confocal microscopy that mitochondria are a major site of H2S production in HEK293 cells and that MnPs decrease mitochondrial H2S production and increase PS in what appeared to be nucleoli and cytosolic fibrillary elements. This supports a role for MnPs in the metabolism of H2S to PS, the latter serving as both short- and long-term antioxidants, and suggests that some of the biological effects of MnPs may be attributable to sulfur metabolism.
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Affiliation(s)
- Kenneth R. Olson
- Indiana University School of Medicine-South Bend Center, South Bend, IN 46617, USA; (Y.G.); (C.R.T.); (D.B.)
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
- Correspondence: ; Tel.: +1 (574) 631-7560
| | - Yan Gao
- Indiana University School of Medicine-South Bend Center, South Bend, IN 46617, USA; (Y.G.); (C.R.T.); (D.B.)
| | - Andrea K. Steiger
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR 97403, USA; (A.K.S.); (M.D.P.)
| | - Michael D. Pluth
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR 97403, USA; (A.K.S.); (M.D.P.)
| | - Charles R. Tessier
- Indiana University School of Medicine-South Bend Center, South Bend, IN 46617, USA; (Y.G.); (C.R.T.); (D.B.)
| | - Troy A. Markel
- Indiana University School of Medicine, Riley Hospital for Children at IU Health, 705 Riley Hospital Dr, RI 2500, Indianapolis, IN 46202, USA;
| | - David Boone
- Indiana University School of Medicine-South Bend Center, South Bend, IN 46617, USA; (Y.G.); (C.R.T.); (D.B.)
| | - Robert V. Stahelin
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907, USA;
| | - Ines Batinic-Haberle
- Department of Radiation Oncology, School of Medicine, Duke University, Durham, NC 27710, USA;
| | - Karl D. Straubg
- Central Arkansas Veteran’s Healthcare System, Little Rock, AR 72205, USA;
- Departments of Medicine and Biochemistry, University of Arkansas for Medical Sciences, Little Rock, AR 72202, USA
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Olson KR, Briggs A, Devireddy M, Xian M, Gao Y. Are the beneficial effects of 'antioxidant' lipoic acid mediated through metabolism of reactive sulfur species? Free Radic Biol Med 2020; 146:139-149. [PMID: 31676393 DOI: 10.1016/j.freeradbiomed.2019.10.410] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Revised: 10/08/2019] [Accepted: 10/21/2019] [Indexed: 12/28/2022]
Abstract
The health benefits of lipoic acid (LA) are generally attributed to mitigating the harmful effects of reactive oxygen species (ROS). ROS are chemically similar to reactive sulfur species (RSS) and signal through identical mechanisms. Here we examined the effects of LA on RSS in HEK293 cells using H2S and polysulfide (PS) specific fluorophores, AzMC and SSP4. We show that LA concentration-dependently increased both H2S and PS. Physioxia (5% O2) augmented the effects of LA on H2S production but decreased PS production. Thiosulfate, a known substrate for reduced LA, and an intermediate in the catabolism of H2S enhanced the effects of LA on H2S and PS production. Inhibiting peroxiredoxins with conoidin A and gluraredoxins with tiopronin augmented the effects of LA on PS and H2S, respectively while decreasing glutathione with buthionine-sulfoximine (BSO) or diethyl maleate (DEM) decreased the stimulatory effect of LA on H2S production but augmented LA's effect on PS. Aminooxyacetate (AOA) and propargylglycine (PPG), inhibitors of H2S production from cysteine partially inhibited LA augmentation of H2S production and further decreased the LA effect when applied concurrently with BSO and DEM. The selective and cell-permeable H2S scavenger, SS20, inhibited the effects of LA on cellular H2S. Estimates of single-cell H2S production suggest that 0.1-0.2% of O2 consumption is used to metabolize H2S and these requirements may increase to 1-2% with 1 mM LA. Collectively, these results suggest that LA rescues H2S from irreversible oxidation and that the effects of LA on RSS directly confer antioxidant, anti-inflammatory and cytoprotective responses. They also suggest that TS may be an effective supplement to increase the efficacy of LA in clinical settings.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine, South Bend Center, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA.
| | - Austin Briggs
- Indiana University School of Medicine, South Bend Center, South Bend, IN, 46617, USA
| | - Monesh Devireddy
- Indiana University School of Medicine, South Bend Center, South Bend, IN, 46617, USA
| | - Ming Xian
- Department of Chemistry, Washington State University, Pullman, WA, 99164, USA
| | - Yan Gao
- Indiana University School of Medicine, South Bend Center, South Bend, IN, 46617, USA
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17
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Abstract
Life began in a ferruginous (anoxic and Fe2+ dominated) world around 3.8 billion years ago (bya). Hydrogen sulfide (H2S) and other sulfur molecules from hydrothermal vents and other fissures provided many key necessities for life's origin including catalytic platforms (primordial enzymes) that also served as primitive boundaries (cell walls), substrates for organic synthesis and a continuous source of energy in the form of reducing equivalents. Anoxigenic photosynthesis oxidizing H2S followed within a few hundred million years and laid the metabolic groundwork for oxidative photosynthesis some half-billion years later that slightly and episodically increased atmospheric oxygen around 2.3 bya. This oxidized terrestrial sulfur to sulfate which was washed to the sea where it was reduced creating vast euxinic (anoxic and sulfidic) areas. It was in this environment that eukaryotic cells appeared around 1.5 bya and where they evolved for nearly 1 billion additional years. Oxidative photosynthesis finally oxidized the oceans and around 0.6 bya oxygen levels in the atmosphere and oceans began to rise toward present day levels. This is purported to have been a life-threatening event due to the prevalence of reactive oxygen species (ROS) and thus necessitated the elaboration of chemical and enzymatic antioxidant mechanisms. However, these antioxidants initially appeared around the time of anoxigenic photosynthesis suggesting a commitment to metabolism of reactive sulfur species (RSS). This review examines these events and suggests that many of the biological attributes assigned to ROS may, in fact, be due to RSS. This is underscored by observations that ROS and RSS are chemically similar, often indistinguishable by analytical methods and the fact that the bulk of biochemical and physiological experiments are performed in unphysiologically oxic environments where ROS are artifactually favored over RSS.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine-South Bend, Raclin Carmichael Hall, 1234 Notre Dame Ave, South Bend, IN 46617, USA.
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18
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Drucker NA, Te Winkel JP, Shelley WC, Olson KR, Markel TA. Inhibiting hydrogen sulfide production in umbilical stem cells reduces their protective effects during experimental necrotizing enterocolitis. J Pediatr Surg 2019; 54:1168-1173. [PMID: 30879750 PMCID: PMC6545254 DOI: 10.1016/j.jpedsurg.2019.02.037] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2019] [Accepted: 02/21/2019] [Indexed: 02/06/2023]
Abstract
INTRODUCTION Umbilical mesenchymal stem cells (USC) have been shown to reduce illness in animal models of necrotizing enterocolitis (NEC), possibly through the paracrine release of hydrogen sulfide (H2S). We hypothesized that animals treated with USCs with inhibited H2S synthesis would exhibit more severe disease. METHODS NEC was induced in five-day-old mouse pups by formula feeding and hypoxic and hypothermic stress. Experimental groups received intraperitoneal injection of either saline vehicle or 80,000cells/gram of one of the following cell types: USC, USCs with negative-control siRNA, or USCs with targeted siRNA inhibition of the H2S-producing enzymes. Pups were monitored by clinical assessment and after euthanasia, intestine and lung histologic injury were scored. Tissue was homogenized, and concentrations of IL-6, IL-10, and VEGF were determined by ELISA. For statistical analysis, p<0.05 was considered significant. RESULTS Animals treated with negative-control siRNA USCs were significantly improved compared to vehicle. Clinical sickness scores as well as intestinal and lung histologic injury scores in the targeted siRNA groups were significantly worse when compared to the negative-control siRNA group. IL-6, IL-10, and VEGF had varying patterns of expression in the different groups. CONCLUSION Inhibition of H2S production in USCs reduces the beneficial effects of these cells during therapy in experimental NEC. LEVEL OF EVIDENCE Animal studies are typically described as "foundational evidence" without a true level assigned. TYPE OF STUDY Animal Study.
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Affiliation(s)
- Natalie A Drucker
- Department of Surgery, Section of Pediatric Surgery, Riley Hospital for Children at Indiana University Health, Indianapolis, IN; The Indiana University School of Medicine, Indianapolis, Indianapolis, IN.
| | - Jan P Te Winkel
- Department of Surgery, Section of Pediatric Surgery, Riley Hospital for Children at Indiana University Health, Indianapolis, IN; The Indiana University School of Medicine, Indianapolis, Indianapolis, IN
| | - W Christopher Shelley
- Department of Surgery, Section of Pediatric Surgery, Riley Hospital for Children at Indiana University Health, Indianapolis, IN
| | - Kenneth R Olson
- The Indiana University School of Medicine, South Bend, South Bend, IN
| | - Troy A Markel
- Department of Surgery, Section of Pediatric Surgery, Riley Hospital for Children at Indiana University Health, Indianapolis, IN; The Indiana University School of Medicine, Indianapolis, Indianapolis, IN
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19
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Olson KR, Gao Y. Effects of inhibiting antioxidant pathways on cellular hydrogen sulfide and polysulfide metabolism. Free Radic Biol Med 2019; 135:1-14. [PMID: 30790656 DOI: 10.1016/j.freeradbiomed.2019.02.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 02/12/2019] [Accepted: 02/12/2019] [Indexed: 12/18/2022]
Abstract
Elaborate antioxidant pathways have evolved to minimize the threat of excessive reactive oxygen species (ROS) and to regulate ROS as signaling entities. ROS are chemically and functionally similar to reactive sulfur species (RSS) and both ROS and RSS have been shown to be metabolized by the antioxidant enzymes, superoxide dismutase and catalase. Here we use fluorophores to examine the effects of a variety of inhibitors of antioxidant pathways on metabolism of two important RSS, hydrogen sulfide (H2S with AzMC) and polysulfides (H2Sn, where n = 2-7, with SSP4) in HEK293 cells. Cells were exposed to inhibitors for up to 5 days in normoxia (21% O2) and hypoxia (5% O2), conditions also known to affect ROS production. Decreasing intracellular glutathione (GSH) with l-buthionine-sulfoximine (BSO) or diethyl maleate (DEM) decreased H2S production for 5 days but did not affect H2Sn. The glutathione reductase inhibitor, auranofin, initially decreased H2S and H2Sn but after two days H2Sn increased over controls. Inhibition of peroxiredoxins with conoidin A decreased H2S and increased H2Sn, whereas the glutathione peroxidase inhibitor, tiopronin, increased H2S. Aminoadipic acid, an inhibitor of cystine uptake did not affect either H2S or H2Sn. In buffer, the glutathione reductase and thioredoxin reductase inhibitor, 2-AAPA, the glutathione peroxidase mimetic, ebselen, and tiopronin variously reacted directly with AzMC and SSP4, reacted with H2S and H2S2, or optically interfered with AzMC or SSP4 fluorescence. Collectively these results show that antioxidant inhibitors, generally known for their ability to increase cellular ROS, have various effects on cellular RSS. These findings suggest that the inhibitors may affect cellular sulfur metabolism pathways that are not related to ROS production and in some instances they may directly affect RSS or the methods used to measure them. They also illustrate the importance of carefully evaluating RSS metabolism when biologically or pharmacologically attempting to manipulate ROS.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine - South Bend, South Bend, IN, 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA.
| | - Yan Gao
- Indiana University School of Medicine - South Bend, South Bend, IN, 46617, USA
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20
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Abstract
It is now well established that hydrogen sulfide (H2S) is an effector of a wide variety of physiological processes. It is also clear that many of the effects of H2S are mediated through reactions with cysteine sulfur on regulatory proteins and most of these are not mediated directly by H2S but require prior oxidation of H2S and the formation of per- and polysulfides (H2Sn, n = 2-8). Attendant with understanding the regulatory functions of H2S and H2Sn is an appreciation of the mechanisms that control, i.e., both increase and decrease, their production and catabolism. Although a number of standard "conventional" pathways have been described and well characterized, novel "unconventional" pathways are continuously being identified. This review summarizes our current knowledge of both the conventional and unconventional.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine - South Bend, South Bend, IN 46617, USA.
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21
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Olson KR, Gao Y, Arif F, Arora K, Patel S, DeLeon ER, Sutton TR, Feelisch M, Cortese-Krott MM, Straub KD. Metabolism of hydrogen sulfide (H 2S) and Production of Reactive Sulfur Species (RSS) by superoxide dismutase. Redox Biol 2017; 15:74-85. [PMID: 29220697 PMCID: PMC5725220 DOI: 10.1016/j.redox.2017.11.009] [Citation(s) in RCA: 112] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Revised: 10/16/2017] [Accepted: 11/08/2017] [Indexed: 11/29/2022] Open
Abstract
Reactive sulfur species (RSS) such as H2S, HS•, H2Sn, (n = 2–7) and HS2•- are chemically similar to H2O and the reactive oxygen species (ROS) HO•, H2O2, O2•- and act on common biological effectors. RSS were present in evolution long before ROS, and because both are metabolized by catalase it has been suggested that “antioxidant” enzymes originally evolved to regulate RSS and may continue to do so today. Here we examined RSS metabolism by Cu/Zn superoxide dismutase (SOD) using amperometric electrodes for dissolved H2S, a polysulfide-specific fluorescent probe (SSP4), and mass spectrometry to identify specific polysulfides (H2S2-H2S5). H2S was concentration- and oxygen-dependently oxidized by 1 μM SOD to polysulfides (mainly H2S2, and to a lesser extent H2S3 and H2S5) with an EC50 of approximately 380 μM H2S. H2S concentrations > 750 μM inhibited SOD oxidation (IC50 = 1.25 mM) with complete inhibition when H2S > 1.75 mM. Polysulfides were not metabolized by SOD. SOD oxidation preferred dissolved H2S over hydrosulfide anion (HS-), whereas HS- inhibited polysulfide production. In hypoxia, other possible electron donors such as nitrate, nitrite, sulfite, sulfate, thiosulfate and metabisulfite were ineffective. Manganese SOD also catalyzed H2S oxidation to form polysulfides, but did not metabolize polysulfides indicating common attributes of these SODs. These experiments suggest that, unlike the well-known SOD-mediated dismutation of two O2•- to form H2O2 and O2, SOD catalyzes a reaction using H2S and O2 to form persulfide. These can then combine in various ways to form polysulfides and sulfur oxides. It is also possible that H2S (or polysulfides) interact/react with SOD cysteines to affect catalytic activity or to directly contribute to sulfide metabolism. Our studies suggest that H2S metabolism by SOD may have been an ancient mechanism to detoxify sulfide or to regulate RSS and along with catalase may continue to do so in contemporary organisms. Polysulfides are reactive sulfide species (RSS) and are similar to reactive oxygen species (ROS). RSS may be the antecedent of redox regulatory and stress-related modalities. RSS likely persist in modern-day organisms and are regulated by SOD.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine - South Bend Center, South Bend, IN 46617, USA.
| | - Yan Gao
- Indiana University School of Medicine - South Bend Center, South Bend, IN 46617, USA
| | - Faihaan Arif
- Indiana University School of Medicine - South Bend Center, South Bend, IN 46617, USA
| | - Kanika Arora
- Indiana University School of Medicine - South Bend Center, South Bend, IN 46617, USA
| | - Shivali Patel
- Indiana University School of Medicine - South Bend Center, South Bend, IN 46617, USA
| | - Eric R DeLeon
- Indiana University School of Medicine - South Bend Center, South Bend, IN 46617, USA; University of Notre Dame, Notre Dame, IN 46556, USA
| | - Thomas R Sutton
- NIHR Southampton Biomedical Research Center, University of Southampton, Southampton, General Hospital, Southampton SO16 6YD, UK; Clinical & Experimental Sciences, Faculty of Medicine, Southampton General Hospital and Institute for Life Sciences, University of Southampton, Southampton SO16 6YD, UK
| | - Martin Feelisch
- NIHR Southampton Biomedical Research Center, University of Southampton, Southampton, General Hospital, Southampton SO16 6YD, UK; Clinical & Experimental Sciences, Faculty of Medicine, Southampton General Hospital and Institute for Life Sciences, University of Southampton, Southampton SO16 6YD, UK
| | - Miriam M Cortese-Krott
- Cardiovascular Research Laboratory, Department of Cardiology, Pneumology and Angiology,Medical Faculty, Heinrich Heine University of Düsseldorf, Universitätstrasse 1, 40225 Düsseldorf, Germany
| | - Karl D Straub
- Central Arkansas Veteran's Healthcare System, Little Rock, AR 72205 USA; Departments of Medicine and Biochemistry, University of Arkansas for Medical Sciences, Little Rock, AR 72202 USA
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Cortese-Krott MM, Koning A, Kuhnle GGC, Nagy P, Bianco CL, Pasch A, Wink DA, Fukuto JM, Jackson AA, van Goor H, Olson KR, Feelisch M. The Reactive Species Interactome: Evolutionary Emergence, Biological Significance, and Opportunities for Redox Metabolomics and Personalized Medicine. Antioxid Redox Signal 2017; 27:684-712. [PMID: 28398072 PMCID: PMC5576088 DOI: 10.1089/ars.2017.7083] [Citation(s) in RCA: 215] [Impact Index Per Article: 30.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
SIGNIFICANCE Oxidative stress is thought to account for aberrant redox homeostasis and contribute to aging and disease. However, more often than not, administration of antioxidants is ineffective, suggesting that our current understanding of the underlying regulatory processes is incomplete. Recent Advances: Similar to reactive oxygen species and reactive nitrogen species, reactive sulfur species are now emerging as important signaling molecules, targeting regulatory cysteine redox switches in proteins, affecting gene regulation, ion transport, intermediary metabolism, and mitochondrial function. To rationalize the complexity of chemical interactions of reactive species with themselves and their targets and help define their role in systemic metabolic control, we here introduce a novel integrative concept defined as the reactive species interactome (RSI). The RSI is a primeval multilevel redox regulatory system whose architecture, together with the physicochemical characteristics of its constituents, allows efficient sensing and rapid adaptation to environmental changes and various other stressors to enhance fitness and resilience at the local and whole-organism level. CRITICAL ISSUES To better characterize the RSI-related processes that determine fluxes through specific pathways and enable integration, it is necessary to disentangle the chemical biology and activity of reactive species (including precursors and reaction products), their targets, communication systems, and effects on cellular, organ, and whole-organism bioenergetics using system-level/network analyses. FUTURE DIRECTIONS Understanding the mechanisms through which the RSI operates will enable a better appreciation of the possibilities to modulate the entire biological system; moreover, unveiling molecular signatures that characterize specific environmental challenges or other forms of stress will provide new prevention/intervention opportunities for personalized medicine. Antioxid. Redox Signal. 00, 000-000.
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Affiliation(s)
- Miriam M Cortese-Krott
- 1 Cardiovascular Research Laboratory, Department of Cardiology, Pneumology and Angiology, Medical Faculty, Heinrich Heine University , Düsseldorf, Germany
| | - Anne Koning
- 2 Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen , Groningen, The Netherlands
| | - Gunter G C Kuhnle
- 3 Department of Food and Nutritional Sciences, University of Reading , Reading, United Kingdom
| | - Peter Nagy
- 4 Molecular Immunology and Toxicology, National Institute of Oncology , Budapest, Hungary
| | | | - Andreas Pasch
- 6 Department of Clinical Chemistry, University of Bern and Calciscon AG , Bern, Switzerland
| | - David A Wink
- 7 Cancer and Inflammation Program, National Cancer Institute, National Institutes of Health , Frederick, Maryland
| | - Jon M Fukuto
- 8 Department of Chemistry, Sonoma State University , Rohnert Park, California
| | - Alan A Jackson
- 9 NIHR Southampton Biomedical Research Center, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom
| | - Harry van Goor
- 2 Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen , Groningen, The Netherlands
| | - Kenneth R Olson
- 10 Indiana University School of Medicine-South Bend , South Bend, Indiana
| | - Martin Feelisch
- 9 NIHR Southampton Biomedical Research Center, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom .,11 Clinical and Experimental Sciences, Faculty of Medicine, Southampton General Hospital and Institute for Life Sciences, University of Southampton , Southampton, United Kingdom
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Olson KR, Gao Y, Arif F, Arora K, Patel S, DeLeon E, Straub KD. Fluorescence quenching by metal centered porphyrins and poryphyrin enzymes. Am J Physiol Regul Integr Comp Physiol 2017; 313:R340-R346. [PMID: 28835449 DOI: 10.1152/ajpregu.00202.2017] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Revised: 07/19/2017] [Accepted: 07/20/2017] [Indexed: 12/12/2022]
Abstract
Fluorescence spectroscopy and microscopy have been used extensively to monitor biomolecules, especially reactive oxygen species (ROS) and, more recently, reactive sulfide (RSS) species. Nearly all fluorophores are either excited by or emit light between 450 and 550 nm, which is similar to the absorbance of heme proteins and metal-centered porphyrins. Here we examined the effects of catalase (Cat), reduced and oxidized hemoglobin (Hb and metHb), albumin (alb), manganese (III) tetrakis (4-benzoic acid) porphyrin chloride (MnTBAP), iron protoporphyrin IX (hemin), and copper protoporphyrin IX (CuPPIX) on the fluorescence properties of fluorescein. We also examined the effects of catalase and MnTBAP on fluorophores for ROS (dichlorofluorescein, DCF), polysulfides (3',6'-di(O-thiosalicyl)fluorescein, SSP4), and H2S (7-azido-4-methylcoumarin, AzMC) previously activated by H2O2, a mixed polysulfide (H2Sn, n = 1-7) and H2S, respectively. All except albumin concentration dependently inhibited fluorophore fluorescence and absorbed light between 450 and 550 nm, suggesting that the inhibitory effect was physical not catalytic. Catalase inhibition of fluorescein fluorescence was unaffected by sodium azide, dithiothreitol, diamide, tris(2-carboxyethyl)phosphine (TCEP), or iodoacetate, supporting a physical inhibitory mechanism. Catalase and TBAP augmented, then inhibited DCF fluorescence, but only inhibited SSP4 and AzMC fluorescence indicative of a substrate-specific catalytic oxidation of DCF and nonspecific fluorescence inhibition of all three fluorophores. These results suggest caution must be exercised when using any fluorescent tracers in the vicinity of metal-centered porphyrins.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana;
| | - Yan Gao
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana
| | - Faihaan Arif
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana
| | - Kanika Arora
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana
| | - Shivali Patel
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana
| | - Eric DeLeon
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana.,Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana
| | - Karl D Straub
- Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; and.,Departments of Medicine and Biochemistry, University of Arkansas for Medical Sciences, Little Rock, Arkansas
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Olson KR, Gao Y, DeLeon ER, Arif M, Arif F, Arora N, Straub KD. Catalase as a sulfide-sulfur oxido-reductase: An ancient (and modern?) regulator of reactive sulfur species (RSS). Redox Biol 2017; 12:325-339. [PMID: 28285261 PMCID: PMC5350573 DOI: 10.1016/j.redox.2017.02.021] [Citation(s) in RCA: 100] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 02/11/2017] [Accepted: 02/24/2017] [Indexed: 11/19/2022] Open
Abstract
Catalase is well-known as an antioxidant dismutating H2O2 to O2 and H2O. However, catalases evolved when metabolism was largely sulfur-based, long before O2 and reactive oxygen species (ROS) became abundant, suggesting catalase metabolizes reactive sulfide species (RSS). Here we examine catalase metabolism of H2Sn, the sulfur analog of H2O2, hydrogen sulfide (H2S) and other sulfur-bearing molecules using H2S-specific amperometric electrodes and fluorophores to measure polysulfides (H2Sn; SSP4) and ROS (dichlorofluorescein, DCF). Catalase eliminated H2Sn, but did not anaerobically generate H2S, the expected product of dismutation. Instead, catalase concentration- and oxygen-dependently metabolized H2S and in so doing acted as a sulfide oxidase with a P50 of 20mmHg. H2O2 had little effect on catalase-mediated H2S metabolism but in the presence of the catalase inhibitor, sodium azide (Az), H2O2 rapidly and efficiently expedited H2S metabolism in both normoxia and hypoxia suggesting H2O2 is an effective electron acceptor in this reaction. Unexpectedly, catalase concentration-dependently generated H2S from dithiothreitol (DTT) in both normoxia and hypoxia, concomitantly oxidizing H2S in the presence of O2. H2S production from DTT was inhibited by carbon monoxide and augmented by NADPH suggesting that catalase heme-iron is the catalytic site and that NADPH provides reducing equivalents. Catalase also generated H2S from garlic oil, diallyltrisulfide, thioredoxin and sulfur dioxide, but not from sulfite, metabisulfite, carbonyl sulfide, cysteine, cystine, glutathione or oxidized glutathione. Oxidase activity was also present in catalase from Aspergillus niger. These results show that catalase can act as either a sulfide oxidase or sulfur reductase and they suggest that these activities likely played a prominent role in sulfur metabolism during evolution and may continue do so in modern cells as well. This also appears to be the first observation of catalase reductase activity independent of peroxide dismutation.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine - South Bend, South Bend, IN 46617, USA.
| | - Yan Gao
- Indiana University School of Medicine - South Bend, South Bend, IN 46617, USA
| | - Eric R DeLeon
- Indiana University School of Medicine - South Bend, South Bend, IN 46617, USA; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Maaz Arif
- Indiana University School of Medicine - South Bend, South Bend, IN 46617, USA
| | - Faihaan Arif
- Indiana University School of Medicine - South Bend, South Bend, IN 46617, USA
| | - Nitin Arora
- Indiana University School of Medicine - South Bend, South Bend, IN 46617, USA
| | - Karl D Straub
- Central Arkansas Veteran's Healthcare System, Little Rock, AR 72205, USA; Departments of Medicine and Biochemistry, University of Arkansas for Medical Sciences, Little Rock, AR 72202, USA
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Abstract
For 99 married couples, marital adjustment was related to elevated scores on extraversion and openness to experience on a measure of the five-factor personality model.
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Krause NC, Kutsche HS, Santangelo F, DeLeon ER, Dittrich NP, Olson KR, Althaus M. Hydrogen sulfide contributes to hypoxic inhibition of airway transepithelial sodium absorption. Am J Physiol Regul Integr Comp Physiol 2016; 311:R607-17. [DOI: 10.1152/ajpregu.00177.2016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Accepted: 07/13/2016] [Indexed: 01/23/2023]
Abstract
In lung epithelial cells, hypoxia decreases the expression and activity of sodium-transporting molecules, thereby reducing the rate of transepithelial sodium absorption. The mechanisms underlying the sensing of hypoxia and subsequent coupling to sodium-transporting molecules remain unclear. Hydrogen sulfide (H2S) has recently been recognized as a cellular signaling molecule whose intracellular concentrations critically depend on oxygen levels. Therefore, it was questioned whether endogenously produced H2S contributes to hypoxic inhibition of sodium transport. In electrophysiological Ussing chamber experiments, hypoxia was established by decreasing oxygen concentrations in the chambers. Hypoxia concentration dependently and reversibly decreased amiloride-sensitive sodium absorption by cultured H441 monolayers and freshly dissected porcine tracheal epithelia due to inhibition of basolateral Na+/K+-ATPase. Exogenous application of H2S by the sulfur salt Na2S mimicked the effect of hypoxia and inhibited amiloride-sensitive sodium absorption by both tissues in an oxygen-dependent manner. Hypoxia increased intracellular concentrations of H2S and decreased the concentration of polysulfides. Pretreatment with the cystathionine-γ-lyase inhibitor d/l-propargylglycine (PAG) decreased hypoxic inhibition of sodium transport by H441 monolayers, whereas inhibition of cystathionine-β-synthase (with aminooxy-acetic acid; AOAA) or 3-mercaptopyruvate sulfurtransferase (with aspartate) had no effect. Inhibition of all of these H2S-generating enzymes with a combination of AOAA, PAG, and aspartate decreased the hypoxic inhibition of sodium transport by H441 cells and pig tracheae and decreased H2S production by tracheae. These data suggest that airway epithelial cells endogenously produce H2S during hypoxia, and this contributes to hypoxic inhibition of transepithelial sodium absorption.
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Affiliation(s)
- Nicole C. Krause
- Institute for Animal Physiology, Justus-Liebig-University, Giessen, Germany; and
| | - Hanna S. Kutsche
- Institute for Animal Physiology, Justus-Liebig-University, Giessen, Germany; and
| | - Fabrizio Santangelo
- Institute for Animal Physiology, Justus-Liebig-University, Giessen, Germany; and
| | - Eric R. DeLeon
- Department of Physiology, Indiana University School of Medicine-South Bend, South Bend, Indiana
| | - Nikolaus P. Dittrich
- Institute for Animal Physiology, Justus-Liebig-University, Giessen, Germany; and
| | - Kenneth R. Olson
- Department of Physiology, Indiana University School of Medicine-South Bend, South Bend, Indiana
| | - Mike Althaus
- Institute for Animal Physiology, Justus-Liebig-University, Giessen, Germany; and
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Abstract
Factor analyses were conducted of several commonly used questionnaire measures of curiosity in adults. A General Curiosity factor emerged in both total scale and subscale factorings. This factor included the Melbourne State and Trait Personality Questionnaires, the Academic Curiosity Scale, the Ontario Test of Intrinsic Motivation Specific Curiosity subscales, and Spielberger's State and Trait Curiosity Inventories. Rather than measuring curiosity, the Proverbs Test appeared to reflect venturesomeness, and the Diversive Curiosity Scale and Sensation Seeking Scale loaded on an Experience Seeking factor. Additional findings are discussed.
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DeLeon ER, Gao Y, Huang E, Olson KR. Garlic oil polysulfides: H2S- and O2-independent prooxidants in buffer and antioxidants in cells. Am J Physiol Regul Integr Comp Physiol 2016; 310:R1212-25. [PMID: 27101293 PMCID: PMC4935497 DOI: 10.1152/ajpregu.00061.2016] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Accepted: 04/07/2016] [Indexed: 12/21/2022]
Abstract
The health benefits of garlic and other organosulfur-containing foods are well recognized and have been attributed to both prooxidant and antioxidant activities. The effects of garlic are surprisingly similar to those of hydrogen sulfide (H2S), which is also known to be released from garlic under certain conditions. However, recent evidence suggests that polysulfides, not H2S, may be the actual mediator of physiological signaling. In this study, we monitored formation of H2S and polysulfides from garlic oil in buffer and in human embryonic kidney (HEK) 293 cells with fluorescent dyes, 7-azido-4-methylcoumarin and SSP4, respectively and redox activity with two redox indicators redox-sensitive green fluorescent protein (roGFP) and DCF. Our results show that H2S release from garlic oil in buffer requires other low-molecular-weight thiols, such as cysteine (Cys) or glutathione (GSH), whereas polysulfides are readily detected in garlic oil alone. Administration of garlic oil to cells rapidly increases intracellular polysulfide but has minimal effects on H2S unless Cys or GSH are also present in the extracellular medium. We also observed that garlic oil and diallyltrisulfide (DATS) potently oxidized roGFP in buffer but did not affect DCF. This appears to be a direct polysulfide-mediated oxidation that does not require a reactive oxygen species intermediate. Conversely, when applied to cells, garlic oil became a significant intracellular reductant independent of extracellular Cys or GSH. This suggests that intracellular metabolism and further processing of the sulfur moieties are necessary to confer antioxidant properties to garlic oil in vivo.
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Affiliation(s)
- Eric R DeLeon
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana; and Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana
| | - Yan Gao
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana; and
| | - Evelyn Huang
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana; and Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana
| | - Kenneth R Olson
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana; and
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Olson KR, Gao Y, Huang E, Arif M, Arora N, Divietro A, Patel S, Deleon ER. A Case of Mistaken Identity: Are Reactive Oxygen Species Actually Reactive Sulfide Species? FASEB J 2016. [DOI: 10.1096/fasebj.30.1_supplement.742.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Yan Gao
- PhysiologyIndiana Univ. Sch. Med. South BendSouth BendIN
| | - Evelyn Huang
- PhysiologyIndiana Univ. Sch. Med. South BendSouth BendIN
- Biological SciencesUniversity of Notre DameNotre DameIN
| | - Maaz Arif
- PhysiologyIndiana Univ. Sch. Med. South BendSouth BendIN
| | - Nitin Arora
- PhysiologyIndiana Univ. Sch. Med. South BendSouth BendIN
| | | | - Shivali Patel
- PhysiologyIndiana Univ. Sch. Med. South BendSouth BendIN
| | - Eric R Deleon
- PhysiologyIndiana Univ. Sch. Med. South BendSouth BendIN
- Biological SciencesUniversity of Notre DameNotre DameIN
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DeLeon ER, Gao Y, Huang E, Arif M, Arora N, Divietro A, Patel S, Olson KR. A case of mistaken identity: are reactive oxygen species actually reactive sulfide species? Am J Physiol Regul Integr Comp Physiol 2016; 310:R549-60. [PMID: 26764057 PMCID: PMC4867382 DOI: 10.1152/ajpregu.00455.2015] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 12/31/2015] [Indexed: 12/31/2022]
Abstract
Stepwise one-electron reduction of oxygen to water produces reactive oxygen species (ROS) that are chemically and biochemically similar to reactive sulfide species (RSS) derived from one-electron oxidations of hydrogen sulfide to elemental sulfur. Both ROS and RSS are endogenously generated and signal via protein thiols. Given the similarities between ROS and RSS, we wondered whether extant methods for measuring the former would also detect the latter. Here, we compared ROS to RSS sensitivity of five common ROS methods: redox-sensitive green fluorescent protein (roGFP), 2', 7'-dihydrodichlorofluorescein, MitoSox Red, Amplex Red, and amperometric electrodes. All methods detected RSS and were as, or more, sensitive to RSS than to ROS. roGFP, arguably the "gold standard" for ROS measurement, was more than 200-fold more sensitive to the mixed polysulfide H2Sn(n = 1-8) than to H2O2 These findings suggest that RSS may be far more prevalent in intracellular signaling than previously appreciated and that the contribution of ROS may be overestimated. This conclusion is further supported by the observation that estimated daily sulfur metabolism and ROS production are approximately equal and the fact that both RSS and antioxidant mechanisms have been present since the origin of life, nearly 4 billion years ago, long before the rise in environmental oxygen 600 million years ago. Although ROS are assumed to be the most biologically relevant oxidants, our results question this paradigm. We also anticipate our findings will direct attention toward development of novel and clinically relevant anti-(RSS)-oxidants.
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Affiliation(s)
- Eric R DeLeon
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana; and Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana
| | - Yan Gao
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana; and
| | - Evelyn Huang
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana; and Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana
| | - Maaz Arif
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana; and
| | - Nitin Arora
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana; and
| | - Alexander Divietro
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana; and
| | - Shivali Patel
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana; and
| | - Kenneth R Olson
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana; and
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Deleon ER, Huang E, Gao Y, Olson KR. Effects of Hypoxia on intracellular H
2
S and Polysulfides: Implications in O
2
Sensing. FASEB J 2016. [DOI: 10.1096/fasebj.30.1_supplement.746.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Eric R Deleon
- PhysiologyIndiana Univ. Sch. Med. South BendSouth BendIN
- Biological SciencesUniversity of Notre DameNotre DameIN
| | - Evelyn Huang
- PhysiologyIndiana Univ. Sch. Med. South BendSouth BendIN
- Biological SciencesUniversity of Notre DameNotre DameIN
| | - Yan Gao
- PhysiologyIndiana Univ. Sch. Med. South BendSouth BendIN
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Olson KR, Straub KD. The Role of Hydrogen Sulfide in Evolution and the Evolution of Hydrogen Sulfide in Metabolism and Signaling. Physiology (Bethesda) 2016; 31:60-72. [DOI: 10.1152/physiol.00024.2015] [Citation(s) in RCA: 136] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The chemical versatility of sulfur and its abundance in the prebiotic Earth as reduced sulfide (H2S) implicate this molecule in the origin of life 3.8 billion years ago and also as a major source of energy in the first seven-eighths of evolution. The tremendous increase in ambient oxygen ∼600 million years ago brought an end to H2S as an energy source, and H2S-dependent animals either became extinct, retreated to isolated sulfide niches, or adapted. The first 3 billion years of molecular tinkering were not lost, however, and much of this biochemical armamentarium easily adapted to an oxic environment where it contributes to metabolism and signaling even in humans. This review examines the role of H2S in evolution and the evolution of H2S metabolism and signaling.
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Affiliation(s)
- Kenneth R. Olson
- Indiana University School of Medicine, South Bend, South Bend, Indiana; and
| | - Karl D. Straub
- Central Arkansas Veteran's Healthcare System and University of Arkansas for Medical Sciences, Little Rock, Arkansas
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Abstract
BACKGROUND Lindane is a possible carcinogen with known teratogenicity and immunologic and neurotoxic properties. Despite reports of seizures, coma, and death associated with its use as well as banning of its environmental use by the Environmental Protection Agency (EPA), the US Food and Drug Administration (FDA) still allows treatment with lindane as a second-line scabicide and pediculicide. We present a case of a massive suicidal ingestion of lindane in which the patient survived the ingestion, though he did expire shortly thereafter from an unrelated cause pre-discharge. METHODS Pharmacokinetic analysis of serum lindane concentrations was performed with Phoenix® WinNONLIN®. The estimated distribution half-life for lindane was 10.3 h, and the terminal half-life was 162.9 h, much longer than the previously reported terminal half-life of 25-36 h. Because of this long half-life, repeated lindane exposures may lead to accumulation of lindane in the tissues. RESULT After overdose, toxicity may be delayed and full recovery may be prolonged.
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Affiliation(s)
- D A Wiles
- Nationwide Children's Hospital Medical Toxicology Fellowship, The Ohio State University Wexner Medical Center, 700 Children's Drive (Bldg 255 RM-344), Columbus, OH, 43205, USA,
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Wichmann L, Agné AM, Baldin JP, Benjamin AR, Orogo-Wenn MC, Olson KR, Walters DV, Althaus M. Hydrogen sulfide decreases β-adrenergic agonist stimulated lung liquid clearance by uncoupling transepithelial sodium absorption of cAMP/PKA-stimulation. Nitric Oxide 2015. [DOI: 10.1016/j.niox.2015.02.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Olson KR. The role of hydrogen sulfide in evolution and the evolution of hydrogen sulfide signaling. Nitric Oxide 2015. [DOI: 10.1016/j.niox.2015.02.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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DeLeon ER, Huang ES, Gao Y, Olson KR. Redox activities of hydrogen sulfide and polysulfides; implications in oxygen sensing. Nitric Oxide 2015. [DOI: 10.1016/j.niox.2015.02.136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Abstract
SIGNIFICANCE Although oxygen (O2)-sensing cells and tissues have been known for decades, the identity of the O2-sensing mechanism has remained elusive. Evidence is accumulating that O2-dependent metabolism of hydrogen sulfide (H2S) is this enigmatic O2 sensor. RECENT ADVANCES The elucidation of biochemical pathways involved in H2S synthesis and metabolism have shown that reciprocal H2S/O2 interactions have been inexorably linked throughout eukaryotic evolution; there are multiple foci by which O2 controls H2S inactivation, and the effects of H2S on downstream signaling events are consistent with those activated by hypoxia. H2S-mediated O2 sensing has been demonstrated in a variety of O2-sensing tissues in vertebrate cardiovascular and respiratory systems, including smooth muscle in systemic and respiratory blood vessels and airways, carotid body, adrenal medulla, and other peripheral as well as central chemoreceptors. CRITICAL ISSUES Information is now needed on the intracellular location and stoichometry of these signaling processes and how and which downstream effectors are activated by H2S and its metabolites. FUTURE DIRECTIONS Development of specific inhibitors of H2S metabolism and effector activation as well as cellular organelle-targeted compounds that release H2S in a time- or environmentally controlled way will not only enhance our understanding of this signaling process but also provide direction for future therapeutic applications.
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Affiliation(s)
- Kenneth R Olson
- Department of Physiology, Indiana University School of Medicine-South Bend , South Bend, India na
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Agné AM, Baldin JP, Benjamin AR, Orogo-Wenn MC, Wichmann L, Olson KR, Walters DV, Althaus M. Hydrogen sulfide decreases β-adrenergic agonist-stimulated lung liquid clearance by inhibiting ENaC-mediated transepithelial sodium absorption. Am J Physiol Regul Integr Comp Physiol 2015; 308:R636-49. [PMID: 25632025 DOI: 10.1152/ajpregu.00489.2014] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Accepted: 01/19/2015] [Indexed: 01/11/2023]
Abstract
In pulmonary epithelia, β-adrenergic agonists regulate the membrane abundance of the epithelial sodium channel (ENaC) and, thereby, control the rate of transepithelial electrolyte absorption. This is a crucial regulatory mechanism for lung liquid clearance at birth and thereafter. This study investigated the influence of the gaseous signaling molecule hydrogen sulfide (H2S) on β-adrenergic agonist-regulated pulmonary sodium and liquid absorption. Application of the H2S-liberating molecule Na2S (50 μM) to the alveolar compartment of rat lungs in situ decreased baseline liquid absorption and abrogated the stimulation of liquid absorption by the β-adrenergic agonist terbutaline. There was no additional effect of Na2S over that of the ENaC inhibitor amiloride. In electrophysiological Ussing chamber experiments with native lung epithelia (Xenopus laevis), Na2S inhibited the stimulation of amiloride-sensitive current by terbutaline. β-adrenergic agonists generally increase ENaC abundance by cAMP formation and activation of PKA. Activation of this pathway by forskolin and 3-isobutyl-1-methylxanthine increased amiloride-sensitive currents in H441 pulmonary epithelial cells. This effect was inhibited by Na2S in a dose-dependent manner (5-50 μM). Na2S had no effect on cellular ATP concentration, cAMP formation, and activation of PKA. By contrast, Na2S prevented the cAMP-induced increase in ENaC activity in the apical membrane of H441 cells. H441 cells expressed the H2S-generating enzymes cystathionine-β-synthase, cystathionine-γ-lyase, and 3-mercaptopyruvate sulfurtransferase, and they produced H2S amounts within the employed concentration range. These data demonstrate that H2S prevents the stimulation of ENaC by cAMP/PKA and, thereby, inhibits the proabsorptive effect of β-adrenergic agonists on lung liquid clearance.
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Affiliation(s)
- Alisa M Agné
- Institute of Animal Physiology, Department of Molecular Cell Physiology, Justus-Liebig University, Giessen, Germany
| | - Jan-Peter Baldin
- Institute of Animal Physiology, Department of Molecular Cell Physiology, Justus-Liebig University, Giessen, Germany
| | - Audra R Benjamin
- Division of Clinical Sciences, St. George's University of London, London, United Kingdom
| | - Maria C Orogo-Wenn
- Division of Clinical Sciences, St. George's University of London, London, United Kingdom
| | - Lukas Wichmann
- Institute of Animal Physiology, Department of Molecular Cell Physiology, Justus-Liebig University, Giessen, Germany
| | - Kenneth R Olson
- Department of Physiology, Indiana University School of Medicine-South Bend, South Bend, Indiana; and
| | - Dafydd V Walters
- Division of Clinical Sciences, St. George's University of London, London, United Kingdom
| | - Mike Althaus
- Institute of Animal Physiology, Department of Molecular Cell Physiology, Justus-Liebig University, Giessen, Germany;
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Olson KR, DeLeon ER, Liu F. Controversies and conundrums in hydrogen sulfide biology. Nitric Oxide 2014; 41:11-26. [PMID: 24928561 DOI: 10.1016/j.niox.2014.05.012] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2013] [Revised: 05/28/2014] [Accepted: 05/30/2014] [Indexed: 01/10/2023]
Abstract
Hydrogen sulfide (H2S) signaling has been implicated in physiological processes in practically all organ systems studied to date. At times the excitement of this new field has outpaced the technical expertise or practical knowledge with which to accurately assess these advancements. Recently, the myriad of proposed H2S actions has spawned interest in using indicators of H2S metabolism, especially plasma H2S concentrations, as a means of identifying a variety of pathophysiological conditions or to predict clinical outcomes. While this is a noteworthy endeavor, there are a number of contraindications to this practice at this time. First, there is little consensus regarding normal, i.e., "physiological" concentrations of H2S in either plasma or tissue. In fact, it has been shown that the methods most often employed for these measurements are associated with substantial artifact. Second, interactions, or presumed lack thereof, of H2S with other biomolecules (e.g., O2, H2O2, pH, etc.) or analytical reagents (e.g., reducing reagents, N-ethylmaleimide, phenylarsine, etc.) are often assumed but not evaluated. Third, the experimental design and/or statistical analyses may not be sufficient to justify using H2S concentration in tissue or blood as a predictive biomarker of pathophysiology. In this study, we first briefly review the problems associated with plasma and tissue H2S measurements and the associated errors and we provide some simple methods to evaluate whether the data obtained is physiologically relevant. Second we provide a brief analysis of H2S interactions with the above biomolecules. Third, we provide a statistical tool with which to determine the clinical applicability of H2S measurements. It is hoped that these points will provide a rational background for future work.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine - South Bend, South Bend, IN 46617, United States.
| | - Eric R DeLeon
- Indiana University School of Medicine - South Bend, South Bend, IN 46617, United States; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, United States
| | - Fang Liu
- Department of Applied and Computational Mathematics and Statistics, University of Notre Dame, Notre Dame, IN 46556, United States
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Gugelmann H, Gerona R, Li C, Tsutaoka B, Olson KR, Lung D. 'Crazy Monkey' poisons man and dog: Human and canine seizures due to PB-22, a novel synthetic cannabinoid. Clin Toxicol (Phila) 2014; 52:635-8. [PMID: 24905571 DOI: 10.3109/15563650.2014.925562] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
CONTEXT Synthetic cannabinoids have been manufactured, sold, and consumed for recreational purposes since at least 2004; their use has been associated with adverse psychiatric, cardiovascular, renal, pulmonary, and neurologic effects. We report simultaneous canine and human clinical cases associated with exposure to a novel synthetic cannabinoid, PB-22 (QUPIC). CASE REPORT A 22-year-old man brought his dog to a veterinary clinic after it had a seizure. During the course of the canine's evaluation, the human patient was witnessed to have a generalized tonic-clonic seizure. He was intubated for agitation and combativeness after his arrival to the emergency department (ED). He was extubated the next day without discernable sequelae. The canine patient received intravenous hydration and was also discharged to home after a period of close observation. The man later endorsed smoking three containers of a substance called "Crazy Monkey" daily for several weeks, but would not disclose how his dog had been exposed. The convulsant effects of "Crazy Monkey" were confirmed in this patient when, three months later, he was sedated, paralyzed, intubated, and admitted to another local hospital for seizures in the context of smoking the same product. DISCUSSION Laboratory analysis of samples obtained from the human and canine patients. A sample of the product (labeled "Crazy Monkey") revealed the presence of PB-22 (QUPIC), a novel synthetic cannabinoid. Additionally, serum and urine samples from the human patient contained metabolites of a second compound, UR-144. CONCLUSION We present a laboratory-confirmed case report of human and canine neurotoxicity associated with a novel synthetic cannabinoid, PB-22 (QUIPIC).
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Affiliation(s)
- H Gugelmann
- San Francisco Division, California Poison Control System, University of California San Francisco , San Francisco, CA , USA
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DeLeon ER, Olson KR, Huang E, Gao Y. P73. Nitric Oxide 2014. [DOI: 10.1016/j.niox.2014.03.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Yang F, Shaw A, Garduno E, Olson KR. No one likes a copycat: a cross-cultural investigation of children's response to plagiarism. J Exp Child Psychol 2014; 121:111-9. [PMID: 24473471 DOI: 10.1016/j.jecp.2013.11.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2013] [Revised: 11/07/2013] [Accepted: 11/17/2013] [Indexed: 12/24/2022]
Abstract
Copying other people's ideas is evaluated negatively by American children and adults. The current study investigated the influence of culture on children's evaluations of plagiarism by comparing children from three countries--the United States, Mexico, and China--that differ in terms of their emphasis on the protection of intellectual property and ideas. Children (3- to 6-year-olds) were presented with videos involving two characters drawing pictures and were asked to evaluate the character who drew unique work or the character who copied someone else's drawing. The study showed that 5- and 6-year-olds from all three cultures evaluated copiers negatively compared with unique drawers. These results suggest that children from cultures that place different values on the protection of ideas nevertheless develop similar concerns with plagiarism by 5-year-olds.
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Affiliation(s)
- F Yang
- University of Pennsylvania, Philadelphia, PA 19104, USA; Yale University, New Haven, CT 06511, USA.
| | - A Shaw
- Yale University, New Haven, CT 06511, USA
| | - E Garduno
- Yale University, New Haven, CT 06511, USA
| | - K R Olson
- Yale University, New Haven, CT 06511, USA
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Morton LW, Olson KR. Addressing Soil Degradation and Flood Risk Decision Making in Levee Protected Agricultural Lands under Increasingly Variable Climate Conditions. ACTA ACUST UNITED AC 2014. [DOI: 10.4236/jep.2014.512117] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Abstract
The ability to monitor oxygen (O2) availability and delivery is crucial to an animal's survival. Vertebrates have a number of O2 'sensing' cells that monitor environmental oxygen and ensure adequate delivery to the tissues. While there is little doubt that these cells perform important homeostatic functions, there is little consensus on how a change in O2 concentration, or partial pressure (pO2), is transduced into a physiological response. We recently proposed that the metabolism of hydrogen sulfide (H2S) functions as the O2 sensor in a variety of tissues. In this mechanism, the concentration of biologically active H2S is regulated by the simple balance between constitutive H2S production and its oxidation by mitochondria. This hypothesis is supported by a number of experimental observations in a wide range of O2 sensing tissues: 1) exogenous H2S produces the same physiological response as hypoxia; 2) cellular H2S production is inversely related to pO2 at physiologically relevant pO2s; 3) agonists and antagonists of H2S biosynthesis augment and inhibit hypoxic responses, respectively; and 4) H2S and hypoxia appear to act via common effector pathways. The reciprocal relationship between H2S and O2 also has a long evolutionary history suggesting these gases have been inexorably intertwined throughout evolution. The intent of this review is to elaborate on the mechanism of H2S-mediated O2 sensing.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine, South Bend, South Bend, IN 46617, USA.
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Olson KR. Testing the rebound peer review concept. Antioxid Redox Signal 2013; 19:1-4. [PMID: 23425024 DOI: 10.1089/ars.2013.5222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
This invited Editorial addresses the rescue of the article by Xue et al. "Hydrogen sulfide treatment promotes glucose uptake by increasing insulin receptor sensitivity and ameliorates kidney lesions in type 2 diabetes." The work was rejected by the standard peer review system and subsequently rescued via the Rebound Peer Review mechanism offered by Antioxidants and Redox Signaling (Antoxid Redox Signal 16: 293-296, 2012). The open reviewers rescuing the work were Jin-Song Bian, Samuel Dudley, Hideo Kimura, and Xian Wang. The initial article was reviewed by six reviewers who had valid concerns; they recommended extensive revision and additional experiments. In the subsequent two iterations, the authors nearly doubled the number of experiments and made substantial revisions. However, several reviewers were still not satisfied, and the authors requested the rebound pathway. The open reviewers, selected by the authors and experts in hydrogen sulfide biology, diabetes, and cardiovascular physiology, added a broad perspective to the review process. They acknowledged the anonymous reviewer's concerns, but felt that the merits of the study were sufficient to recommend acceptance. The open reviewers also identified several situations where the recommendations of the anonymous reviewers and the author's attempts to rectify them were moot, given the available methodology and present state of the field. From this perspective, the rebound track was a success; it rescued an article that otherwise would have been rejected and will stimulate further discussion and research in this area. Whether or not there are more efficient ways to accomplish, this remains to be determined.
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Affiliation(s)
- Kenneth R. Olson
- Department of Physiology, Indiana University School of Medicine—South Bend, South Bend, Indiana
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Olson KR, Deleon ER, Gao Y, Hurley K, Sadauskas V, Batz C, Stoy GF. Thiosulfate: a readily accessible source of hydrogen sulfide in oxygen sensing. Am J Physiol Regul Integr Comp Physiol 2013; 305:R592-603. [PMID: 23804280 DOI: 10.1152/ajpregu.00421.2012] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
H2S derived from organic thiol metabolism has been proposed serve as an oxygen sensor in a variety of systems because of its susceptibility to oxidation and its ability to mimic hypoxic responses in numerous oxygen-sensing tissues. Thiosulfate, an intermediate in oxidative H2S metabolism can alternatively be reduced and regenerate H2S. We propose that this contributes to the H2S-mediated oxygen-sensing mechanism. H2S formation from thiosulfate in buffers and in a variety of mammalian tissues and in lamprey dorsal aorta was examined in real time using a polarographic H2S sensor. Inferences of intracellular H2S production were made by examining hypoxic pulmonary vasoconstriction (HPV) in bovine pulmonary arteries under conditions in which increased H2S production would be expected and in mouse and rat aortas, where reducing conditions should mediate vasorelaxation. In Krebs-Henseleit (mammalian) and Cortland (lamprey) buffers, H2S was generated from thiosulfate in the presence of the exogenous reducing agent, DTT, or the endogenous reductant dihydrolipoic acid (DHLA). Both the magnitude and rate of H2S production were greatly increased by these reductants in the presence of tissue, with the most notable effects occurring in the liver. H2S production was only observed when tissues were hypoxic; exposure to room air, or injecting oxygen inhibited H2S production and resulted in net H2S consumption. Both DTT and DHLA augmented HPV, and DHLA dose-dependently relaxed precontracted mouse and rat aortas. These results indicate that thiosulfate can contribute to H2S signaling under hypoxic conditions and that this is not only a ready source of H2S production but also serves as a means of recycling sulfur and thereby conserving biologically relevant thiols.
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Affiliation(s)
- Kenneth R Olson
- Indiana University School of Medicine-South Bend Center, South Bend, Indiana; and
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Affiliation(s)
- Martin Feelisch
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton General Hospital, Tremona Road, Southampton, SO16 6YD, United Kingdom.
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