Glucocorticoids and serum- and glucocorticoid-inducible kinase 1 are potent regulators of CFTR in the native intestine: implications for stress-induced diarrhea
| Autor: | Kazi Mirajul Hoque, Leandra Kali Figueroa‐Hall, TuKiet T. Lam, Rolando Garcia-Milian, Vanessa M Baratta, Pedro J.I. Salas, Kaimul Ahsan, Nadia A. Ameen |
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| Rok vydání: | 2020 |
| Předmět: |
Diarrhea
Male 0301 basic medicine Physiology Nedd4 Ubiquitin Protein Ligases Bacterial Toxins Cystic Fibrosis Transmembrane Conductance Regulator Protein Serine-Threonine Kinases Dexamethasone Immediate-Early Proteins Rats Sprague-Dawley Enterotoxins Phosphatidylinositol 3-Kinases 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Physiology (medical) Animals Dimethyl Sulfoxide Cyclic adenosine monophosphate Phosphatidylinositol Protein kinase B Cyclic guanosine monophosphate Hepatology biology Sodium-Hydrogen Exchanger 3 Kinase Escherichia coli Proteins Gastroenterology Pyruvate Dehydrogenase Acetyl-Transferring Kinase Molecular biology Rats Ubiquitin ligase Protein Transport 030104 developmental biology 14-3-3 Proteins Gene Expression Regulation chemistry 030220 oncology & carcinogenesis biology.protein SGK1 Phosphorylation Proto-Oncogene Proteins c-akt Research Article |
| Zdroj: | Am J Physiol Gastrointest Liver Physiol |
| ISSN: | 1522-1547 0193-1857 |
| Popis: | Nongenomic glucocorticoid (GC) and serum- and glucocorticoid-inducible kinase 1 (SGK1) signaling regulate ion transport, but CFTR has not been investigated in the intestine. We examined GC, SGK1, and phosphatidylinositol 3-kinase (PI3K) kinase signaling of CFTR ion transport in native intestine and the role of GCs on mRNA, protein, surface expression, and cyclic guanosine monophosphate (cGMP)-elicited diarrhea. Rats were treated with dexamethasone (DEXA; 2 mg/kg ip) or DMSO for 1, 4, and 24 h. Cyclic adenosine monophosphate (cAMP)-activated ion transport was examined in the presence or absence of SGK1 and PI3K inhibitors. Phosphorylation of SGK1, phosphoinositide-dependent kinase 1, and Akt kinases was confirmed by immunoblots using phosphor-specific antibodies. Tissue lysates were analyzed by mass spectrometry. CFTR and SGK1 mRNA were measured by quantitative PCR. Changes in total and surface CFTR protein were determined. The role of GC in cGMP-activated CFTR ion transport was examined. GC synergistically increased CFTR ion transport by SGK1 and PI3K signaling and increased CFTR protein without altering SGK1 or CFTR mRNA. GC induced highest levels of CFTR protein at 4 h that were associated with marked increase in surface CFTR, phosphorylation of the ubiquitin ligase neural precursor cell expressed developmentally downregulated 4-like (Nedd4-2), and 14-3-3ε, supporting their roles in surface retention and stability. Coimmunoprecipitation of CFTR, Nedd4-2, and 14-3-3ε indicated that assembly of this complex is a likely effector of the SGK and Akt pathways. Mass spectrometry identified phosphorylated peptides in relevant proteins. GC-SGK1 potently regulates CFTR in the intestine and is implicated in diarrheal disease. NEW & NOTEWORTHY This is the first study to examine the mechanisms of glucocorticoid, serum- and glucocorticoid-inducible kinase 1, and nongenomic kinase signaling of CFTR in the native intestine. We identified unique and druggable intestine-specific factors of the pathway that are targets for treating stress-induced diarrhea. |
| Databáze: | OpenAIRE |
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