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Related Concept Videos

Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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Related Experiment Video

Updated: Apr 24, 2026

Real-Time Analysis of Bioenergetics in Primary Human Retinal Pigment Epithelial Cells Using High-Resolution Respirometry
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PEDF improves mitochondrial function in RPE cells during oxidative stress.

Yuan He1, Kar Wah Leung2, Yuan Ren3

  • 1Department of Neural and Behavioral Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States Department of Ophthalmology, The Second Affiliated Hospital of Xi'an College of Medicine, Xi'an, China.

Investigative Ophthalmology & Visual Science
|September 13, 2014
PubMed
Summary

Pigment epithelium-derived factor (PEDF) protects aging retinal pigment epithelial (RPE) cells from oxidative stress by maintaining mitochondrial function. PEDF enhances RPE cell resilience through the PI3K/Akt pathway, crucial for mitochondrial health.

Keywords:
ATPMAPKPEDFPI3K/AktROSRPEUCP2agingapoptosiscaspase 3cyclophilin Dmitochondriamitochondria structuremitochondrial membrane potentialoxidative stress

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Induction and Analysis of Oxidative Stress in Sleeping Beauty Transposon-Transfected Human Retinal Pigment Epithelial Cells
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Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Aging Research

Background:

  • Oxidative stress contributes to cellular aging and damage, particularly in retinal pigment epithelial (RPE) cells.
  • Age-dependent decline in mitochondrial function exacerbates RPE cell vulnerability to oxidative stress.

Purpose of the Study:

  • To investigate the protective role of pigment epithelium-derived factor (PEDF) against oxidative stress-induced damage in RPE cells.
  • To elucidate the involvement of mitochondrial pathways and signaling cascades in PEDF's protective effects.

Main Methods:

  • RPE cells from different age groups were exposed to hydrogen peroxide (H2O2) with or without PEDF preconditioning or post-treatment.
  • Mitochondrial function, cell viability, oxidative stress markers, and key signaling pathways (PI3K/Akt, MAPK) were assessed.

Main Results:

  • Oxidative stress caused age-dependent RPE cell death, impaired mitochondrial function, and disrupted mitochondrial networks.
  • PEDF treatment significantly improved cell viability, preserved mitochondrial function (ATP production, membrane potential), and reduced reactive oxygen species (ROS).
  • PEDF's protective effects were mediated through the PI3K/Akt pathway, which stabilized mitochondrial structure and function and modulated gene expression related to mitochondrial function and apoptosis.

Conclusions:

  • PEDF enhances the resilience of aging RPE cells to oxidative stress by stabilizing mitochondrial networks and function.
  • Mitochondrial dynamics in RPE cells are regulated, in part, by the PI3K/Akt signaling pathway.