1. Phosphoproteomic Response to Epidermal Growth Factor in Native Rat Inner Medullary Collecting Duct.
- Author
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Chou CL, Jayatissa NU, Kichula ET, Ou SM, Limbutara K, and Knepper MA
- Abstract
Epidermal growth factor (EGF) has important effects in the renal collecting duct to regulate salt and water transport. To identify elements of EGF-mediated signaling in the rat renal inner medullary collecting duct (IMCD), we carried out phosphoproteomics analysis. Biochemically isolated rat IMCD suspensions were treated with 1 μM of EGF or vehicle for 30 min. We performed comprehensive quantitative phosphoproteomics using TMT-labeling of tryptic peptides followed by protein mass spectrometry. We present a data resource reporting all detected phosphorylation sites and their changes in response to EGF. For a total of 29,881 unique phosphorylation sites, 135 sites were increased and 119 sites were decreased based on stringent statistical analysis. The data are provided to users at https://esbl.nhlbi.nih.gov/Databases/EGF-phospho/. Analysis demonstrated that EGF signals through canonical EGF pathways in the renal IMCD. Analysis of KEGG pathways in which EGF-regulated phosphoproteins are over-represented in native rat IMCD cells confirmed mapping to RAF-MEK-ERK signaling, but also pointed to a role for EGF in the regulation of protein translation. A large number of phosphoproteins regulated by EGF contained PDZ domains that are key elements of epithelial polarity determination. We also provide a collecting duct EGF-network map as a user accessible web resource at https://esbl.nhlbi.nih.gov/Databases/EGF-network/. Overall, the phosphoproteomic data presented provide a useful resource for experimental design and modeling of signaling in the renal collecting duct.
- Published
- 2024