Effects of 17β-Estradiol on Activity, Gene and Protein Expression of Superoxide Dismutases in Primary Cultured Human Lens Epithelial Cells
Journal article, 2018

Purpose: Protective effects of estradiol against H 2 O 2 -induced oxidative stress have been demonstrated in lens epithelial cells. The purpose of this study was to investigate the effects of 17β-estradiol (E2) on the different superoxide dismutase (SOD) isoenzymes, SOD-1, SOD-2, and SOD-3, as well as estrogen receptors (ERs), ERα and ERβ, in primary cultured human lens epithelial cells (HLECs). Materia ls and methods: HLECs were exposed to 0.1 µM or 1 µM E2 for 1.5 h and 24 h after which the effects were studied. Protein expression and immunolocalization of SOD-1, SOD-2, ERα, and ERβ were studied with Western blot and immunocytochemistry. Total SOD activity was measured, and gene expression analyses were performed for SOD1, SOD2, and SOD3. Results: Increased SOD activity was seen after 1.5 h exposure to both 0.1 µM and 1 µM E2. There were no significant changes in protein or gene expression of the different SODs. Immunolabeling of SOD-1 was evident in the cytosol and nucleus; whereas, SOD-2 was localized in the mitochondria. Both ERα and ERβ were immunolocalized to the nucleus, and mitochondrial localization of ERβ was evident by colocalization with MitoTracker. Both ERα and ERβ showed altered protein expression levels after exposure to E2. Conclusions: The observed increase in SOD activity after exposure to E2 without accompanying increase in gene or protein expression supports a role for E2 in protection against oxidative stress mediated through non-genomic mechanisms.

cataract

lens epithelial cells

superoxide dismutase

17β-estradiol

oxidative stress

Author

Dragana Škiljić

Sahlgrenska University Hospital

Sahlgrenska Academy

Anne Petersen

Sahlgrenska Academy

Jan Olof Karlsson

University of Gothenburg

Anders Behndig

Umeå University

Staffan Nilsson

Chalmers, Mathematical Sciences, Applied Mathematics and Statistics

Madeleine Zetterberg

Sahlgrenska University Hospital

Sahlgrenska Academy

Current Eye Research

0271-3683 (ISSN)

Vol. 43 639-646

Subject Categories

Cell and Molecular Biology

Developmental Biology

Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)

DOI

10.1080/02713683.2018.1437923