TAT-mediated peroxiredoxin 5 and 6 protein transduction protects against high-glucose-induced cytotoxicity in retinal pericytes

Eri Kubo, Dhirendra P. Singh, Nigar Fatma, Yoshio Akagi

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Aims: Hyperglycemia-induced oxidative stress is implicated in pericyte apoptosis seen in diabetic retinopathy. The six mammalian Peroxiredoxins (PRDXs) comprise a novel family of antioxidative proteins that negatively regulate oxidative stress-induced apoptosis by controlling reactive oxygen species (ROS) levels. Main methods: Sprague-Dawley rats were used to detect the retinal expressions of PRDXs1-6. Pig pericytes cultured in high-glucose medium were used to monitor the protective effect of PRDX5 and 6 against high-glucose-associated change. Recombinant PRDX5 and 6 proteins were linked to the Trans-Activating Transduction (TAT) domain from HIV-1 TAT protein for their efficient delivery into cells/tissues. Key findings: We found higher expression of PRDX5 and 6 mRNAs and PRDX5 and 6 proteins in retina than the other Prdxs (Prdx1-4). Western blotting affirmed the intracellular presence of TAT-linked proteins and revealed the efficient transduction of TAT-HA-PRDX5 and 6 in these cells. Extrinsic supply of TAT-HA-PRDX5 and 6 proteins inhibited the oxidative stress-induced DNA damage after high-glucose exposure in pig pericytes. The cell survival and apoptosis assay revealed that extrinsic supply of TAT-HA-PRDX5 and 6 proteins was responsible for inhibiting hyperglycemia-induced pericyte apoptosis. Significance: Results suggest that delivery of PRDX5 and 6 might protect hyperglycemia-induced pericyte loss to inhibit oxidative stress.

Original languageEnglish (US)
Pages (from-to)857-864
Number of pages8
JournalLife Sciences
Issue number23-24
StatePublished - Jun 5 2009


  • Diabetes
  • Oxidative stress
  • Pericyte
  • Peroxiredoxin
  • Retinopathy

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)

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