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Aging (Albany NY). 2014 Dec;6(12):1064-75.

Pathway activation profiling reveals new insights into age-related macular degeneration and provides avenues for therapeutic interventions.

Author information

1
Insilico Medicine, Inc, ETC, Johns Hopkins University, Baltimore, MD 21218, USA.
2
Boston University, Boston, MA 02215, USA. Retrotope, Inc, Los Altos Hills, CA 94022, USA.
3
Insilico Medicine, Inc, ETC, Johns Hopkins University, Baltimore, MD 21218, USA. The Biogerontology Research Foundation, London, UK.
4
Insilico Medicine, Inc, ETC, Johns Hopkins University, Baltimore, MD 21218, USA. Pathway Pharmaceutivals, Ltd, Hong Kong.
5
Vision Genomics, LLC, Washington, DC 20010, USA. Epigenetics Laboratory, Dept. of Anatomy, Howard University, Washington, DC 20059, USA.

Abstract

Age-related macular degeneration (AMD) is a major cause of blindness in older people and is caused by loss of the central region of the retinal pigment epithelium (RPE). Conventional methods of gene expression analysis have yielded important insights into AMD pathogenesis, but the precise molecular pathway alterations are still poorly understood. Therefore we developed a new software program, "AMD Medicine", and discovered differential pathway activation profiles in samples of human RPE/choroid from AMD patients and controls. We identified 29 pathways in RPE-choroid AMD phenotypes: 27 pathways were activated in AMD compared to controls, and 2 pathways were activated in controls compared to AMD. In AMD, we identified a graded activation of pathways related to wound response, complement cascade, and cell survival. Also, there was downregulation of two pathways responsible for apoptosis. Furthermore, significant activation of pro-mitotic pathways is consistent with dedifferentiation and cell proliferation events, which occur early in the pathogenesis of AMD. Significantly, we discovered new global pathway activation signatures of AMD involved in the cell-based inflammatory response: IL-2, STAT3, and ERK. The ultimate aim of our research is to achieve a better understanding of signaling pathways involved in AMD pathology, which will eventually lead to better treatments.

PMID:
25543336
PMCID:
PMC4298366
DOI:
10.18632/aging.100711
[Indexed for MEDLINE]
Free PMC Article

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