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J Pharm Pharmacol. 2017 Mar;69(3):334-340. doi: 10.1111/jphp.12691. Epub 2017 Feb 3.

Anti-apoptotic effects of Curcuma longa L. extract and its curcuminoids against blue light-induced cytotoxicity in A2E-laden human retinal pigment epithelial cells.

Author information

1
Department of Life and Nanopharmaceutical Sciences, Graduated School, Kyung Hee University, Seoul, Korea.
2
Department of Optometry, Seoul National University of Science and Technology, Seoul, Korea.
3
Department of Oriental Pharmaceutical Sciences, College of Pharmacy, Kyung Hee University, Seoul, Korea.

Abstract

OBJECTIVES:

The purpose of the study was to investigate the protective effect of the Curcuma longa L. extract (CLE) and its curcuminoids against blue light-induced cytotoxicity in human retinal pigment epithelial (RPE) cells laded with A2E. A2E has been concerned in age-related macular degeneration (AMD).

METHODS:

To perform this study, A2E-accumulated ARPE-19 cells were exposed to blue light to induce cytotoxicity. The cytotoxicity and apoptotic gene expression levels were evaluated using a lactate dehydrogenase (LDH) assay and real-time PCR analysis, respectively.

KEY FINDINGS:

Curcuma longa L. extract was found to exert a protective effect in a dose-dependent manner. At a concentration of 15 μm, curcumin, demethoxycurcumin and bisdemethoxycurcumin exerted significant protective effects against blue light-induced cytotoxicity. Treatment with CLE and curcuminoids meaningfully reduced the mRNA levels of c-Abl and p53, which was known to be augmented in apoptotic RPE cells. Demethoxycurcumin and bisdemethoxycurcumin were found to inhibit p38 expression, which is increased in blue light-irradiated A2E-accumulated RPE cells.

CONCLUSIONS:

Curcuma longa L. extract and its curcuminoids provided significant protection against photooxidative damage and apoptosis in the RPE cells. Our results suggest that curcuminoids may show potential in the treatment of AMD.

KEYWORDS:

curcumin ; A2E; age-related macular degeneration; apoptosis; blue light

PMID:
28155996
DOI:
10.1111/jphp.12691
[Indexed for MEDLINE]

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