Unoprostone isopropyl rescues retinal progenitor cells from apoptosis in vitro.

Abstract:

PURPOSE:Unoprostone isopropyl is an ocular hypotensive that was originally produced as a prostaglandin F2alpha analogue and is eventually recognized as a synthetic docosanoid. The compound is recently suggested to have potent neuroprotective ability in the retina. The purpose of this study is to test whether and how the biologically active metabolites of unoprostone isopropyl rescue retinal neuro-glial progenitor cells from apoptosis. METHODS:R28 cells were deprived of serum for 24 hr with or without varying concentrations of unoprostone metabolite M1 or M2 or vehicle in the presence or absence of specific inhibitors against several types of signal transduction proteins. Immunocytochemistry against activated caspase-3 with Hoechst nuclear staining was performed. RESULTS:Up to 15%of R28 cells became pyknotic and activated caspase-3 immunoreactive after 24-hr serum withdrawal. M1, but not M2, significantly reduced apoptotic cells in a dose-dependent fashion with a maximal effect at 100 microM (p < .0001). LY294002, the phosphatidylinositol 3-OH kinase (PI3K) inhibitor, and KT5823, the protein kinase G (PKG) inhibitor, reversed the antiapoptotic effect of M1. CONCLUSIONS:The unoprostone metabolite M1 protects retinal neuro-glial progenitor R28 cells from apoptosis induced by serum deprivation via the PI3K and PKG pathways.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Mukuno H,Nakamura M,Kanamori A,Nagai A,Negi A,Seigel G

doi

10.1080/02713680490889465

subject

Has Abstract

pub_date

2004-12-01 00:00:00

pages

457-64

issue

6

eissn

0271-3683

issn

1460-2202

pii

Q2105K86WDFYXM4L

journal_volume

29

pub_type

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