Abstract：
:Although the gasotransmitter hydrogen sulfide (H(2)S) generally dilates systemic arteries in mammals, it causes constriction of pulmonary arteries. In isolated rat pulmonary arteries, we have shown that the H(2)S precursor cysteine enhances both hypoxic pulmonary vasoconstriction and tension development caused by the agonist prostaglandin F(2α) under normoxic conditions. These effects were blocked by propargylglycine (PAG), a blocker of the enzyme cystathionine γ lyase which metabolises cysteine to sulfide. In the present study, we evaluated whether 3-mercaptopyruvate (3-MP), a sulfide precursor which is thought to give rise to sulfide when it is metabolised by the enzyme mercaptopyruvate sulfurtransferase, also enhanced contraction. Application of 3-MP prior to hypoxic challenge caused a marked enhancement of HPV which was completely blocked by both L- and D,L-PAG (both 1 mM). Cumulative application of 3-1,000 μM 3-MP during an ongoing contraction to PGF(2α) under normoxic conditions also caused a marked increase in tension. Application of D-cysteine (1 mM) also enhanced HPV, and this effect was prevented by both the D-amino acid oxidase inhibitor sodium benzoate (500 μM) and 1 mM L-PAG.
journal_name
Adv Exp Med Bioljournal_title
Advances in experimental medicine and biologyauthors
Prieto-Lloret J,Aaronson PIdoi
10.1007/978-3-319-18440-1_10subject
Has Abstractpub_date
2015-01-01 00:00:00pages
81-7eissn
0065-2598issn
2214-8019journal_volume
860pub_type
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