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ISSN 2522-9028 (Print)
ISSN 2522-9036 (Online)

Fiziologichnyi Zhurnal

is a scientific journal issued by the

Bogomoletz Institute of Physiology
National Academy of Sciences of Ukraine

Editor-in-chief: V.F. Sagach

The journal was founded in 1955 as
1955 – 1977 "Fiziolohichnyi zhurnal" (ISSN 0015 – 3311)
1978 – 1993 "Fiziologicheskii zhurnal" (ISSN 0201 – 8489)
1994 – 2016 "Fiziolohichnyi zhurnal" (ISSN 0201 – 8489)
2017 – "Fiziolohichnyi zhurnal" (ISSN 2522-9028)

Fiziol. Zh. 2014; 60(4): 3-10

Propargylglycine restores endothelium-dependent relaxation of aortic smooth muscles in old rats

Drachuk KO, Kotsiuruba AV, Baziliuk OV, Stepanenko LH, Sahach VF.

    O.O. Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, Kyiv, Ukraine


In the study we investigated the effect of blockade сystathionine- ? -lyase (CSE), an enzyme of hydrogen sulfide (H2S) (de novo) synthesis on the endothelium-dependent relaxation of aortic smooth muscle (SM) in old rats. It has been shown that an inhibition of CSE by propargylglycine (PAG) results in restoration of a decreased ACh-induced relaxation of aorta in old rats. This effect of PAG was removed by blocking nitric oxide (NO) synthesis in the endothelial cells. Age-related changes in the levels of H2S, NO2 - and enzyme activity of the constitutive synthesis of NO (cNOS) in the heart, were determined. It has been shown that PAG introduction elevates a decreased levels of H2S, NO2 - and stimulates the suppressed activity of cNOS in old rats. These results suggest that PAG activates alternative ways of H2S synthesis and stimulates the constitutive synthesis of NO. These actions of PAG restore endothelial function in old rats.

Keywords: propargylglycine, hydrogen sulfide, cystathionine-г-lyase, acetylcholine, nitrogen oxide, endothelium, smoothmuscle, aorta, aging, oxidative stress.


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