Difference between revisions of "Koenitzer 2007 Am J Physiol Heart Circ Physiol"
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{{Publication | {{Publication | ||
|title=Koenitzer JR, Isbell TS, Patel HD, Benavides GA, Dickinson DA, Patel RP, Darley-Usmar VM, Lancaster JR Jr, Doeller JE, Kraus DW (2007) Hydrogen sulfide mediates vasoactivity in an O2-dependent manner. Am. J. Physiol. Heart Circ. Physiol. 292: H1953-1960. | |title=Koenitzer JR, Isbell TS, Patel HD, Benavides GA, Dickinson DA, Patel RP, Darley-Usmar VM, Lancaster JR Jr, Doeller JE, Kraus DW (2007) Hydrogen sulfide mediates vasoactivity in an O2-dependent manner. Am. J. Physiol. Heart Circ. Physiol. 292: H1953-1960. | ||
|authors=Koenitzer JR, Isbell TS, Patel HD, Benavides GA, Dickinson DA, Patel RP, Darley-Usmar VM, Lancaster JR Jr, Doeller JE, Kraus DW | |authors=Koenitzer JR, Isbell TS, Patel HD, Benavides GA, Dickinson DA, Patel RP, Darley-Usmar VM, Lancaster JR Jr, Doeller JE, Kraus DW | ||
|year=2007 | |year=2007 | ||
|journal=American Journal of Physiology - Heart and Circulatory Physiology | |journal=American Journal of Physiology - Heart and Circulatory Physiology | ||
|abstract=Hydrogen sulfide (H2S) has recently been shown to have a signaling role in vascular cells. Similar to nitric oxide (NO), H2S is enzymatically produced by amino acid metabolism and can cause posttranslational modification of proteins, particularly at thiol residues. Molecular targets for H2S include ATP-sensitive K+ channels, and H2S may interact with NO and heme proteins such as cyclooxygenase. It is well known that the reactions of NO in the vasculature are O2 dependent, but this has not been addressed in most studies designed to elucidate the role of H2S in vascular function. This is important, since H2S reactions can be dramatically altered by the high concentrations of O2 used in cell culture and organ bath experiments. To test the hypothesis that the effects of H2S on the vasculature are O2 dependent, we have measured real-time levels of H2S and O2 in respirometry and vessel tension experiments, as well as the associated vascular responses. A novel polarographic H2S sensor developed in our laboratory was used to measure H2S levels. Here we report that, in rat aorta, H2S concentrations that mediate rapid contraction at high O2 levels cause rapid relaxation at lower physiological O2 levels. At high O2, the vasoconstrictive effect of H2S suggests that it may not be H2S per se but, rather, a putative vasoactive oxidation product that mediates constriction. These data are interpreted in terms of the potential for H2S to modulate vascular tone in vivo. | |||
|keywords=Aorta, Sulfide sensor, Oxygen consumption, Vasorelaxation, Mitochondria | |||
|info=[http://www.ncbi.nlm.nih.gov/pubmed/17237242 PMID: 17237242] | |info=[http://www.ncbi.nlm.nih.gov/pubmed/17237242 PMID: 17237242] | ||
}} | }} | ||
{{Labeling | {{Labeling | ||
|topics=Respiration; OXPHOS; ETS Capacity | |||
|instruments=Oxygraph-2k | |instruments=Oxygraph-2k | ||
}} | }} | ||
Revision as of 14:51, 24 September 2010
| Koenitzer JR, Isbell TS, Patel HD, Benavides GA, Dickinson DA, Patel RP, Darley-Usmar VM, Lancaster JR Jr, Doeller JE, Kraus DW (2007) Hydrogen sulfide mediates vasoactivity in an O2-dependent manner. Am. J. Physiol. Heart Circ. Physiol. 292: H1953-1960. |
Koenitzer JR, Isbell TS, Patel HD, Benavides GA, Dickinson DA, Patel RP, Darley-Usmar VM, Lancaster JR Jr, Doeller JE, Kraus DW (2007) American Journal of Physiology - Heart and Circulatory Physiology
Abstract: Hydrogen sulfide (H2S) has recently been shown to have a signaling role in vascular cells. Similar to nitric oxide (NO), H2S is enzymatically produced by amino acid metabolism and can cause posttranslational modification of proteins, particularly at thiol residues. Molecular targets for H2S include ATP-sensitive K+ channels, and H2S may interact with NO and heme proteins such as cyclooxygenase. It is well known that the reactions of NO in the vasculature are O2 dependent, but this has not been addressed in most studies designed to elucidate the role of H2S in vascular function. This is important, since H2S reactions can be dramatically altered by the high concentrations of O2 used in cell culture and organ bath experiments. To test the hypothesis that the effects of H2S on the vasculature are O2 dependent, we have measured real-time levels of H2S and O2 in respirometry and vessel tension experiments, as well as the associated vascular responses. A novel polarographic H2S sensor developed in our laboratory was used to measure H2S levels. Here we report that, in rat aorta, H2S concentrations that mediate rapid contraction at high O2 levels cause rapid relaxation at lower physiological O2 levels. At high O2, the vasoconstrictive effect of H2S suggests that it may not be H2S per se but, rather, a putative vasoactive oxidation product that mediates constriction. These data are interpreted in terms of the potential for H2S to modulate vascular tone in vivo. • Keywords: Aorta, Sulfide sensor, Oxygen consumption, Vasorelaxation, Mitochondria
Labels:
Regulation: Respiration; OXPHOS; ETS Capacity"Respiration; OXPHOS; ETS Capacity" is not in the list (Aerobic glycolysis, ADP, ATP, ATP production, AMP, Calcium, Coupling efficiency;uncoupling, Cyt c, Flux control, Inhibitor, ...) of allowed values for the "Respiration and regulation" property.
HRR: Oxygraph-2k
