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2016 ; 6
(11
): 3533-3540
Nephropedia Template TP
G3 (Bethesda)
2016[Nov]; 6
(11
): 3533-3540
PMID27605519
show ga
Identification of pro-cell survival signaling pathways has implications for
cancer, cardiovascular, and neurodegenerative disease. We show that the
Caenorhabditis elegans epidermal growth factor receptor LET-23 (LET-23 EGFR) has
a prosurvival function in counteracting excitotoxicity, and we identify novel
molecular players required for this prosurvival signaling. uv1 sensory cells in
the C. elegans uterus undergo excitotoxic death in response to activation of the
OSM-9/OCR-4 TRPV channel by the endogenous agonist nicotinamide. Activation of
LET-23 EGFR can effectively prevent this excitotoxic death. We investigate the
roles of signaling pathways known to act downstream of LET-23 EGFR in C. elegans
and find that the LET-60 Ras/MAPK pathway, but not the IP(3) receptor pathway, is
required for efficient LET-23 EGFR activity in its prosurvival function. However,
activation of LET-60 Ras/MAPK pathway does not appear to be sufficient to fully
mimic LET-23 EGFR activity. We screen for genes that are required for EGFR
prosurvival function and uncover a role for phosphatidylcholine biosynthetic
enzymes in EGFR prosurvival function. Finally, we show that exogenous application
of phosphatidylcholine is sufficient to prevent some deaths in this
excitotoxicity model. Our work implicates regulation of lipid synthesis
downstream of EGFR in cell survival and death decisions.