Opačić, Miloš

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Ferrous iron binding to epinephrine promotes the oxidation of iron and impedes activation of adrenergic receptors

Korać Jačić, Jelena; Nikolić, Ljiljana; Stanković, Dalibor; Opačić, Miloš; Dimitrijević, Milena; Savić, Danijela; Grgurić-Šipka, Sanja; Spasojević, Ivan; Bogdanović Pristov, Jelena

(Elsevier, 2020)

TY  - JOUR
AU  - Korać Jačić, Jelena
AU  - Nikolić, Ljiljana
AU  - Stanković, Dalibor
AU  - Opačić, Miloš
AU  - Dimitrijević, Milena
AU  - Savić, Danijela
AU  - Grgurić-Šipka, Sanja
AU  - Spasojević, Ivan
AU  - Bogdanović Pristov, Jelena
PY  - 2020
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/3809
AB  - Upon release in response to stress, epinephrine (Epi) may interact with labile iron pool in human plasma with potentially important (patho)physiological consequences. We have shown that Epi and Fe3+ build stable 1:1 high-spin bidentate complex at physiological pH, and that Epi does not undergo degradation in the presence of iron. However, the interactions of Epi with the more soluble Fe2+, and the impact of iron on biological activity of Epi are still not known. Herein we showed that Epi and Fe2+ build colorless complex which is stable under anaerobic conditions. In the presence of O2, Epi promoted the oxidation of Fe2+ and the formation of Epi-Fe3+ complex. Cyclic voltammetry showed that mid-point potential of Epi-Fe2+ complex is very low (−582 mV vs. standard hydrogen electrode), which explains catalyzed oxidation of Fe2+. Next, we examined the impact of iron binding on biological performance of Epi using patch clamping in cell culture with constitutive expression of adrenergic receptors. Epi alone evoked an increase of outward currents, whereas Epi in the complex with Fe3+ did not. This implies that the binding of Epi to adrenergic receptors and their activation is prevented by the formation of complex with iron. Pro-oxidative activity of Epi-Fe2+ complex may represent a link between chronic stress and cardiovascular problems. On the other hand, labile iron could serve as a modulator of biological activity of ligands. Such interactions may be important in human pathologies that are related to iron overload or deficiency.
PB  - Elsevier
T2  - Free Radical Biology and Medicine
T1  - Ferrous iron binding to epinephrine promotes the oxidation of iron and impedes activation of adrenergic receptors
VL  - 148
SP  - 123
EP  - 127
DO  - 10.1016/j.freeradbiomed.2020.01.001
ER  - 
@article{
author = "Korać Jačić, Jelena and Nikolić, Ljiljana and Stanković, Dalibor and Opačić, Miloš and Dimitrijević, Milena and Savić, Danijela and Grgurić-Šipka, Sanja and Spasojević, Ivan and Bogdanović Pristov, Jelena",
year = "2020",
url = "http://cherry.chem.bg.ac.rs/handle/123456789/3809",
abstract = "Upon release in response to stress, epinephrine (Epi) may interact with labile iron pool in human plasma with potentially important (patho)physiological consequences. We have shown that Epi and Fe3+ build stable 1:1 high-spin bidentate complex at physiological pH, and that Epi does not undergo degradation in the presence of iron. However, the interactions of Epi with the more soluble Fe2+, and the impact of iron on biological activity of Epi are still not known. Herein we showed that Epi and Fe2+ build colorless complex which is stable under anaerobic conditions. In the presence of O2, Epi promoted the oxidation of Fe2+ and the formation of Epi-Fe3+ complex. Cyclic voltammetry showed that mid-point potential of Epi-Fe2+ complex is very low (−582 mV vs. standard hydrogen electrode), which explains catalyzed oxidation of Fe2+. Next, we examined the impact of iron binding on biological performance of Epi using patch clamping in cell culture with constitutive expression of adrenergic receptors. Epi alone evoked an increase of outward currents, whereas Epi in the complex with Fe3+ did not. This implies that the binding of Epi to adrenergic receptors and their activation is prevented by the formation of complex with iron. Pro-oxidative activity of Epi-Fe2+ complex may represent a link between chronic stress and cardiovascular problems. On the other hand, labile iron could serve as a modulator of biological activity of ligands. Such interactions may be important in human pathologies that are related to iron overload or deficiency.",
publisher = "Elsevier",
journal = "Free Radical Biology and Medicine",
title = "Ferrous iron binding to epinephrine promotes the oxidation of iron and impedes activation of adrenergic receptors",
volume = "148",
pages = "123-127",
doi = "10.1016/j.freeradbiomed.2020.01.001"
}
Korać Jačić, J., Nikolić, L., Stanković, D., Opačić, M., Dimitrijević, M., Savić, D., Grgurić-Šipka, S., Spasojević, I.,& Bogdanović Pristov, J. (2020). Ferrous iron binding to epinephrine promotes the oxidation of iron and impedes activation of adrenergic receptors.
Free Radical Biology and Medicine
Elsevier., 148, 123-127.
https://doi.org/10.1016/j.freeradbiomed.2020.01.001
Korać Jačić J, Nikolić L, Stanković D, Opačić M, Dimitrijević M, Savić D, Grgurić-Šipka S, Spasojević I, Bogdanović Pristov J. Ferrous iron binding to epinephrine promotes the oxidation of iron and impedes activation of adrenergic receptors. Free Radical Biology and Medicine. 2020;148:123-127
Korać Jačić Jelena, Nikolić Ljiljana, Stanković Dalibor, Opačić Miloš, Dimitrijević Milena, Savić Danijela, Grgurić-Šipka Sanja, Spasojević Ivan, Bogdanović Pristov Jelena, "Ferrous iron binding to epinephrine promotes the oxidation of iron and impedes activation of adrenergic receptors" Free Radical Biology and Medicine, 148 (2020):123-127,
https://doi.org/10.1016/j.freeradbiomed.2020.01.001 .