SOD2 deficiency-induced oxidative stress attenuates steroidogenesis in mouse ovarian granulosa cells.
“Sod2 Deficiency-Induced Oxidative Stress Attenuates Steroidogenesis In Mouse Ovarian Granulosa Cells.”. Molecular And Cellular Endocrinology, p. 110888..
|Author||Syed Kashif Zaidi, Wen-Jun Shen, Yuan Cortez, Stefanie Bittner, Alex Bittner, Sara Arshad, Ting-Ting Huang, Fredric B Kraemer, Salman Azhar|
|Keywords||antioxidant enzymes, Estradiol, lipid peroxidation, Progestin, reactive oxygen species (ROS), StAR protein|
This study investigated the effects of SOD2 (MnSOD)-deficiency-induced excessive oxidative stress on ovarian steroidogenesis in vivo and isolated and cultured granulosa cells using WT and Sod2+/- mice. Basal and 48 h eCG-stimulated plasma progesterone levels were decreased ~50% in female Sod2+/- mice, whereas plasma progesterone levels were decreased ~70% in Sod2+/- mice after sequential stimulation with eCG followed by hCG. Sod2+/- deficiency caused about 50% reduction in SOD2 activity in granulosa cells. SOD2-deficiency also caused a marked reduction in progestins and estradiol in isolated granulosa cells. qRT-PCR measurements indicated that the mRNA expression levels of StAR protein and steroidogenic enzymes are decreased in the ovaries of Sod2+/- mice. Further studies showed a defect in the movement of mobilized cytosolic cholesterol to mitochondria. The ovarian membrane from Sod2+/- mice showed higher susceptibility to lipid peroxidation. These data indicates that SOD2-deficiency induced oxidative stress inhibits ovarian granulosa cell steroidogenesis primarily by interfering with cholesterol transport to mitochondria and attenuating the expression of Star protein gene and key steroidogenic enzyme genes.
|Year of Publication||
Molecular and cellular endocrinology
|Number of Pages||
Mol Cell Endocrinol