Oxygen dependency of hydrogen sulfide-mediated vasoconstriction in cyclostome aortas

Olson, Kenneth R., Forgan, Leonard G., Dombkowski, Ryan A. and Forster, Malcolm E. 2008, Oxygen dependency of hydrogen sulfide-mediated vasoconstriction in cyclostome aortas, Journal of experimental biology, vol. 211, pp. 2205-2213, doi: 10.1242/jeb.016766.

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Title Oxygen dependency of hydrogen sulfide-mediated vasoconstriction in cyclostome aortas
Author(s) Olson, Kenneth R.
Forgan, Leonard G.ORCID iD for Forgan, Leonard G. orcid.org/0000-0002-3276-8140
Dombkowski, Ryan A.
Forster, Malcolm E.
Journal name Journal of experimental biology
Volume number 211
Start page 2205
End page 2213
Total pages 9
Publisher Wiley-Blackwell Publishing
Place of publication Oxford, United Kingdom
Publication date 2008
ISSN 0022-0949
Keyword(s) Hypoxic vasoconstriction
Oxygen sensing
Vascular smooth muscle
Hypoxic vasoconstriction
Summary Hydrogen sulfide (H2S) has been proposed to mediate hypoxic vasoconstriction (HVC), however, other studies suggest the vasoconstrictory effect indirectly results from an oxidation product of H2S. Here we examined the relationship between H2S and O2 in isolated hagfish and lamprey vessels that exhibit profound hypoxic vasoconstriction. In myographic studies, H2S (Na2S) dose-dependently constricted dorsal aortas (DA) and efferent branchial arteries (EBA) but did not affect ventral aortas or afferent branchial arteries; effects similar to those produced by hypoxia. Sensitivity of H2S-mediated contraction in hagfish and lamprey DA was enhanced by hypoxia. HVC in hagfish DA was enhanced by the H2S precursor cysteine and inhibited by amino-oxyacetate, an inhibitor of the H2S-synthesizing enzyme, cystathionine β-synthase. HVC was unaffected by propargyl glycine, an inhibitor of cystathionine λ-lyase. Oxygen consumption (ṀO2) of hagfish DA was constant between 15 and 115 mmHg PO2 (1 mmHg=0.133 kPa), decreased when PO2 <15 mmHg, and increased after PO2 exceeded 115 mmHg. 10 μmol l–1 H2S increased and ⩾100μ mol l–1 H2S decreased ṀO2. Consistent with the effects on HVC, cysteine increased and amino-oxyacetate decreased O2. These results show that H2S is a monophasic vasoconstrictor of specific cyclostome vessels and because hagfish lack vascular NO, and vascular sensitivity to H2S was enhanced at low PO2, it is unlikely that H2S contractions are mediated by either H2S–NO interaction or an oxidation product of H2S. These experiments also provide additional support for the hypothesis that the metabolism of H2S is involved in oxygen sensing/signal transduction in vertebrate vascular smooth muscle.
Language eng
DOI 10.1242/jeb.016766
Field of Research 060604 Comparative Physiology
060603 Animal Physiology - Systems
060809 Vertebrate Biology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2008, The company of biologists
Persistent URL http://hdl.handle.net/10536/DRO/DU:30048012

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