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 Disjournal_title
Neurobiology of diseaseauthors
Dufour EM,Nandrot E,Marchant D,Van Den Berghe L,Gadin S,Issilame M,Dufier JL,Marsac C,Carper D,Menasche M,Abitbol Mdoi
10.1016/s0969-9961(03)00102-5keywords:
subject
Has Abstractpub_date
2003-11-01 00:00:00pages
166-80issue
2eissn
0969-9961issn
1095-953Xpii
S0969996103001025journal_volume
14pub_type
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