Naslov
Sex-dependent expression of metallothioneins MT1 and MT2 and concentrations of trace elements in rat liver and kidney tissues: effect of gonadectomy

Autori
Marija, Ljubojević ; Tatjana, Orct ; Vedran, Micek ; Dean, Karaica ; Jasna, Jurasović ; Davorka, Breljak ; Ivana, Vrhovac Madunić ; Dubravka, Rašić ; Ivana, Novak Jovanović ; Maja, Peraica ; Marko, Gerić ; Goran, Gajski ; Saša, Kralik Oguić ; Dunja, Rogić ; Lucia, Nanić ; Ivica, Rubelj ; Ivan, Sabolić

Izvornik
Journal of trace elements in medicine and biology (0946-672X) 53 (2019); 98-108

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
end-point RT-PCR ; ICP-MS ; immunocytochemistry ; oxidative status ; sex differences ; sex hormones ; Western blotting

Sažetak
Metallothioneins (MTs) exhibit binding affinity for several essential and toxic trace elements. Previous studies in rodents indicated sex differences in the hepatic and renal expression of MTs and concentrations of various elements. The mechanism responsible for these differences has not been resolved. Here, in the liver and kidney tissues of sham-operated and gonadectomized male and female rats we determined the expression of MT1 and MT2 (MT1&2) mRNA by RT-PCR, abundance of MT1&2 proteins by Western blotting and immunocytochemistry, concentrations of essential (Fe, Zn, Cu, Co) and toxic (Cd, Hg, Pb) elements by ICP-MS, and oxidative status parameters (SOD, GPx, MDA, GSH) by biochemical methods. In both organs, the expression of MT1&2 mRNA and MT1&2 proteins was female-dominant, upregulated by castration, and downregulated by ovariectomy. Concentrations of Fe in the liver and Co in the kidneys followed the same pattern. Most other elements (Zn, Cu, Cd, Hg) exhibited female- or male-dominant sex differences, affected by gonadectomy in one or both organs. Pb was sex- and gonadectomy-unaffected. GPx and MDA were elevated and associated with the highest concentrations of Fe only in the female liver. We conclude that the sex-dependent expression of MT1&2 mRNA and proteins in the rat liver and kidneys may include different mechanisms. In the liver, the female-dominant tissue concentrations of Fe may generate oxidative stress which is a potent enhancer of MTs production, whereas in kidneys, the female-dominant expression of MTs may be unrelated to Fe-mediated oxidative stress.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo, Tekstilna tehnologija, Glazbena umjetnost

POVEZANOST RADA