The Globular C1q Receptor Is Required for Epidermal Growth Factor Receptor Signaling during Candida albicans Infection
Abstract
During oropharyngeal candidiasis, Candida albicans activates the epidermal growth factor receptor (EGFR), which induces oral epithelial cells to endocytose the fungus and synthesize proinflammatory mediators. To elucidate EGFR signaling pathways that are stimulated by C. albicans, we used proteomics to identify 1,214 proteins that were associated with EGFR in C. albicans-infected cells. Seven of these proteins were selected for additional study. Among these proteins, WW domain-binding protein 2, Toll-interacting protein, interferon-induced transmembrane protein 3 (IFITM3), and the globular C1q receptor (gC1qR) were found to associate with EGFR in viable oral epithelial cells. Each of these proteins was required for maximal endocytosis of C. albicans, and all regulated fungus-induced production of interleukin-1β (IL-1β) and/or IL-8, either positively or negatively. gC1qR was found to function as a key coreceptor with EGFR. Interacting with the C. albicans Als3 invasin, gC1qR was required for the fungus to induce autophosphorylation of both EGFR and the ephrin type A receptor 2. The combination of gC1qR and EGFR was necessary for maximal endocytosis of C. albicans and secretion of IL-1β, IL-8, and granulocyte-macrophage colony-stimulating factor (GM-CSF) by human oral epithelial cells. In mouse oral epithelial cells, inhibition of gC1qR failed to block C. albicans-induced phosphorylation, and knockdown of IFITM3 did not inhibit C. albicans endocytosis, indicating that gC1qR and IFITM3 function differently in mouse versus human oral epithelial cells. Thus, this work provides an atlas of proteins that associate with EGFR and identifies several that play a central role in the response of human oral epithelial cells to C. albicans infection.
Additional Information
© 2021 Phan et al. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license. Received 11 September 2021; Accepted 21 September 2021; Published 2 November 2021. We thank Adam Diab for assistance with tissue culture. The work was supported in part by NIH grants R01DE026600 and R01AI124566 to S.G.F., R00DE026856 to M.S., and DE022550 to S.L.G.Attached Files
Published - mBio.02716-21.pdf
Submitted - 2021.05.25.445718v1.full.pdf
Supplemental Material - mbio.02716-21-sf001.pdf
Supplemental Material - mbio.02716-21-sf002.pdf
Supplemental Material - mbio.02716-21-sf003.pdf
Supplemental Material - mbio.02716-21-sf004.pdf
Supplemental Material - mbio.02716-21-sf005.pdf
Supplemental Material - mbio.02716-21-st001.xlsx
Supplemental Material - mbio.02716-21-st002.xlsx
Supplemental Material - mbio.02716-21-st003.xlsx
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Additional details
- PMCID
- PMC8561387
- Eprint ID
- 109293
- Resolver ID
- CaltechAUTHORS:20210528-084342141
- R01DE026600
- NIH
- R01AI124566
- NIH
- R00DE026856
- NIH
- DE022550
- NIH
- Created
-
2021-05-28Created from EPrint's datestamp field
- Updated
-
2023-06-06Created from EPrint's last_modified field
- Caltech groups
- Division of Biology and Biological Engineering