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001-es BibID:	BIBFORM011383
Első szerző:	Varga Zsuzsa (biokémikus, nephrológus)
Cím:	Structural Prerequisite for Antioxidant Activity of Silybin in Different Biochemical Systems in Vitro / Zs. Varga, I. Seres, E. Nagy, L. Ujhelyi, G. Balla, J. Balla, S. Antus
Dátum:	2006
Megjegyzések:	Structural analogues (flavanone: 2-4 and flavone: 5 and 6, respectively) of silybin (1a) were synthesized and tested for inhibitory activity on O2_ release and PKC translocation in PMA-stimulated neutrophils as well as xanthine oxidase activity in order to identify the molecular structures responsible for the antioxidant property of silybin. Concerning the prevention of hem-mediated oxidative modification of LDL by silybin, the hydroxyl radical scavenging activity of its structural analogues was also determined. We demonstrated that the basic skeleton of 1a (4) is responsible for its inhibitory activity on O2_ release in PMA-stimulated neutrophils via inhibition of PKC translocation, since introduction of a double bound and hydroxyl groups at C-5 and C-7 position (5 and 6) did not result in further increase in inhibition of O2_ release. It has been shown that the presence of the phenolic hydroxyl group at C-5 and C-7 of 1a is essential for the inhibition of xanthine oxidase activity. Moreover, introduction of a double bond into the C-ring of 2 and 3, resulting in flavone derivatives (5 and 6), markedly enhanced the antioxidant effect in all the tested systems. Finally, silybin (1a) and its flavon derivatives (5 and 6) directly scavenged hydroxyl radicals as well. On the basis of these results it might be concluded that different moiety of silybin is responsible for inhibition of overproduction of O2_ in stimulated neutrophils, xanthine oxidase activity, and for prevention of hemmediated oxidative modification of LDL.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban Silybin Oxidative stress Antioxidants Protein kinase C Xanthine oxidase Low density lipoprotein
Megjelenés:	Phytomedicine. - 13 : 1-2 (2006), p. 85-93. -
További szerzők:	Seres Ildikó (1954-) (biokémikus) Nagy Emőke (neonatológus, gyermekgyógyász) Újhelyi László (1956-) (belgyógyász) Balla György (1953-) (csecsemő és gyermekgyógyász, neonatológus) Balla József (1959-) (belgyógyász, nephrológus) Antus Sándor (1944-2022) (vegyészmérnök)
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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