Lutein Attenuates Both Apoptosis and Autophagy upon Cobalt (II) Chloride-Induced Hypoxia in Rat Műller Cells

PLoS One. 2016 Dec 9;11(12):e0167828. doi: 10.1371/journal.pone.0167828. eCollection 2016.

Abstract

Retinal ischemia/reperfusion injury is a common feature of various retinal diseases such as glaucoma and diabetic retinopathy. Lutein, a potent anti-oxidant, is used to improve visual function in patients with age-related macular degeneration (AMD). Lutein attenuates apoptosis, oxidative stress and inflammation in animal models of acute retinal ischemia/hypoxia. Here, we further show that lutein improved Műller cell viability and enhanced cell survival upon hypoxia-induced cell death through regulation of intrinsic apoptotic pathway. Moreover, autophagy was activated upon treatment of cobalt (II) chloride, indicating that hypoxic injury not only triggered apoptosis but also autophagy in our in vitro model. Most importantly, we report for the first time that lutein treatment suppressed autophagosome formation after hypoxic insult and lutein administration could inhibit autophagic event after activation of autophagy by a pharmacological approach (rapamycin). Taken together, lutein may have a beneficial role in enhancing glial cell survival after hypoxic injury through regulating both apoptosis and autophagy.

MeSH terms

  • Animals
  • Apoptosis / drug effects*
  • Autophagy / drug effects*
  • Cell Hypoxia*
  • Cell Line, Transformed
  • Cobalt / pharmacology*
  • Lutein / pharmacology*
  • Rats
  • Retina / cytology
  • Retina / drug effects*

Substances

  • Cobalt
  • cobaltous chloride
  • Lutein

Grants and funding

Support was provided by Hong Kong Research Grants Council (GRF#HKU773210M) and an FDCT grant from the Science and Technology Development Fund of Macao (Project code: 090/2013/A3). Both funders had no role in study design, data collection and analysis, decision to publish, or preparation of manuscript.