Identification of novel genes and altered signaling pathways in the retinal pigment epithelium during the Royal College of Surgeons rat retinal degeneration.

Abstract:

:Shed photoreceptor outer segments (POS) are phagocytosed by RPE cells in a circadian manner. The homozygous deletion of the c-mer gene abolishes the ingestion phase of this phagocytosis in the Royal College of Surgeons (RCS) rat strain, which in turn leads to the death of photoreceptor cells. We identified RPE transcripts for which the expression is modulated by the abrogation of POS phagocytosis. A microarray approach and the differential display (DDRT-PCR) technique revealed 116 modulated known genes, 4 modulated unknown genes, and 15 expressed sequenced tags (ESTs) corresponding to unknown genes. The microarray and DDRT-PCR analyses detected alterations in signaling pathways such as the phosphatidylinositol 3-kinase-Akt-mTOR pathway and the DLK/JNK/SAPK pathway. The abrogation of POS phagocytosis caused a decrease in endomembrane biogenesis and altered endocytosis, exocytosis, transcytosis, and several metabolic and signaling pathways in RCS RPE cells. We also found differential levels of transcripts encoding proteins involved in phagocytosis, vesicle trafficking, the cytoskeleton, retinoic acid, and general metabolism.

journal_name

Neurobiol Dis

journal_title

Neurobiology of disease

authors

Dufour EM,Nandrot E,Marchant D,Van Den Berghe L,Gadin S,Issilame M,Dufier JL,Marsac C,Carper D,Menasche M,Abitbol M

doi

10.1016/s0969-9961(03)00102-5

keywords:

subject

Has Abstract

pub_date

2003-11-01 00:00:00

pages

166-80

issue

2

eissn

0969-9961

issn

1095-953X

pii

S0969996103001025

journal_volume

14

pub_type

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