The 5HT 1a receptor agonist 8-OH DPAT induces protection from lipofuscin accumulation and oxidative stress in the retinal pigment epithelium

Prajitha Thampi, Haripriya Vittal Rao, Sayak K. Mitter, Jun Cai, Haoyu Mao, Hong Li, Soojung Seo, Xiaoping Qi, Alfred S. Lewin, Carl Romano, Michael E. Boulton

Research output: Contribution to journalArticle

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Abstract

Age-related macular degeneration (AMD), a major cause of blindness in the elderly, is associated with oxidative stress, lipofuscin accumulation and retinal degeneration. The aim of this study was to determine if a 5-HT 1A receptor agonist can reduce lipofuscin accumulation, reduce oxidative damage and prevent retinal cell loss both in vitro and in vivo. Autophagy-derived and photoreceptor outer segment (POS)-derived lipofuscin formation was assessed using FACS analysis and confocal microscopy in cultured retinal pigment epithelial (RPE) cells in the presence or absence of the 5-HT 1A receptor agonist, 8-OH DPAT. 8-OH DPAT treatment resulted in a dose-dependent reduction in both autophagy- and POS-derived lipofuscin compared to control. Reduction in autophagy-induced lipofuscin was sustained for 4 weeks following removal of the drug. The ability of 8-OH DPAT to reduce oxidative damage following exposure to 200 μM H 2O 2 was assessed. 8-OH DPAT reduced superoxide generation and increased mitochondrial superoxide dismutase (MnSOD) levels and the ratio of reduced glutathione to the oxidized form of glutathione in H 2O 2-treated cells compared to controls and protected against H 2O 2-initiated lipid peroxidation, nitrotyrosine levels and mitochondrial damage. SOD2 knockdown mice, which have an AMD-like phenotype, received daily subcutaneous injections of either saline, 0.5 or 5.0 mg/kg 8-OH DPAT and were evaluated at monthly intervals. Systemic administration of 8-OH DPAT improved the electroretinogram response in SOD2 knockdown eyes of mice compared to knockdown eyes receiving vehicle control. There was a significant increase in the ONL thickness in mice treated with 8-OH DPAT at 4 months past the time of MnSOD knockdown compared to untreated controls together with a 60% reduction in RPE lipofuscin. The data indicate that 5-HT 1A agonists can reduce lipofuscin accumulation and protect the retina from oxidative damage and mitochondrial dysfunction. 5-HT 1A receptor agonists may have potential as therapeutic agents in the treatment of retinal degenerative disease.

Original languageEnglish (US)
Article numbere34468
JournalPLoS One
Volume7
Issue number4
DOIs
StatePublished - Apr 3 2012
Externally publishedYes

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Lipofuscin
8-Hydroxy-2-(di-n-propylamino)tetralin
Oxidative stress
Retinal Pigments
Retinal Pigment Epithelium
serotonin
agonists
autophagy
Oxidative Stress
oxidative stress
epithelium
pigments
receptors
Receptor, Serotonin, 5-HT1A
photoreceptors
Autophagy
glutathione
mice
superoxide dismutase
eyes

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

The 5HT 1a receptor agonist 8-OH DPAT induces protection from lipofuscin accumulation and oxidative stress in the retinal pigment epithelium. / Thampi, Prajitha; Rao, Haripriya Vittal; Mitter, Sayak K.; Cai, Jun; Mao, Haoyu; Li, Hong; Seo, Soojung; Qi, Xiaoping; Lewin, Alfred S.; Romano, Carl; Boulton, Michael E.

In: PLoS One, Vol. 7, No. 4, e34468, 03.04.2012.

Research output: Contribution to journalArticle

Thampi, P, Rao, HV, Mitter, SK, Cai, J, Mao, H, Li, H, Seo, S, Qi, X, Lewin, AS, Romano, C & Boulton, ME 2012, 'The 5HT 1a receptor agonist 8-OH DPAT induces protection from lipofuscin accumulation and oxidative stress in the retinal pigment epithelium', PLoS One, vol. 7, no. 4, e34468. https://doi.org/10.1371/journal.pone.0034468
Thampi, Prajitha ; Rao, Haripriya Vittal ; Mitter, Sayak K. ; Cai, Jun ; Mao, Haoyu ; Li, Hong ; Seo, Soojung ; Qi, Xiaoping ; Lewin, Alfred S. ; Romano, Carl ; Boulton, Michael E. / The 5HT 1a receptor agonist 8-OH DPAT induces protection from lipofuscin accumulation and oxidative stress in the retinal pigment epithelium. In: PLoS One. 2012 ; Vol. 7, No. 4.
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abstract = "Age-related macular degeneration (AMD), a major cause of blindness in the elderly, is associated with oxidative stress, lipofuscin accumulation and retinal degeneration. The aim of this study was to determine if a 5-HT 1A receptor agonist can reduce lipofuscin accumulation, reduce oxidative damage and prevent retinal cell loss both in vitro and in vivo. Autophagy-derived and photoreceptor outer segment (POS)-derived lipofuscin formation was assessed using FACS analysis and confocal microscopy in cultured retinal pigment epithelial (RPE) cells in the presence or absence of the 5-HT 1A receptor agonist, 8-OH DPAT. 8-OH DPAT treatment resulted in a dose-dependent reduction in both autophagy- and POS-derived lipofuscin compared to control. Reduction in autophagy-induced lipofuscin was sustained for 4 weeks following removal of the drug. The ability of 8-OH DPAT to reduce oxidative damage following exposure to 200 μM H 2O 2 was assessed. 8-OH DPAT reduced superoxide generation and increased mitochondrial superoxide dismutase (MnSOD) levels and the ratio of reduced glutathione to the oxidized form of glutathione in H 2O 2-treated cells compared to controls and protected against H 2O 2-initiated lipid peroxidation, nitrotyrosine levels and mitochondrial damage. SOD2 knockdown mice, which have an AMD-like phenotype, received daily subcutaneous injections of either saline, 0.5 or 5.0 mg/kg 8-OH DPAT and were evaluated at monthly intervals. Systemic administration of 8-OH DPAT improved the electroretinogram response in SOD2 knockdown eyes of mice compared to knockdown eyes receiving vehicle control. There was a significant increase in the ONL thickness in mice treated with 8-OH DPAT at 4 months past the time of MnSOD knockdown compared to untreated controls together with a 60{\%} reduction in RPE lipofuscin. The data indicate that 5-HT 1A agonists can reduce lipofuscin accumulation and protect the retina from oxidative damage and mitochondrial dysfunction. 5-HT 1A receptor agonists may have potential as therapeutic agents in the treatment of retinal degenerative disease.",
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