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| Status |
Public on Nov 13, 2023 |
| Title |
Non-canonical activation of IRE1α during Candida albicans infection enhances macrophage fungicidal activity |
| Organism |
Mus musculus |
| Experiment type |
Expression profiling by high throughput sequencing
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| Summary |
Infection by intracellular pathogens can trigger activation of the IRE1α branch of the unfolded protein response (UPR), which then modulates innate immunity and infection outcomes during bacterial or viral infection. However, the mechanisms by which infection activates IRE1α have not been fully elucidated. While recognition of microbe-associated molecular patterns can activate IRE1α, it is unclear whether the canonical role of IRE1α in detecting misfolded proteins is required for its activation. Here, we report that Candida albicans infection of macrophages results in IRE1α activation through C-type lectin receptor signaling, reinforcing a role for IRE1α as a central regulator of host responses to infection by a broad range of pathogens. However, IRE1α activation was not preceded by protein misfolding in response to either C. albicans infection or lipopolysaccharide treatment, implicating a non-canonical mode of IRE1α activation after recognition of microbial patterns. Investigation of the phenotypic consequences of IRE1α activation in macrophage antimicrobial responses revealed that IRE1α activity enhances the fungicidal activity of macrophages. Macrophages lacking IRE1α activity displayed inefficient phagolysosomal fusion, enabling C. albicans to evade fungal killing and escape the phagosome. Together, these data provide mechanistic insight for the non-canonical activation of IRE1α during infection, and reveal central roles for IRE1α in macrophage antifungal responses.
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| Overall design |
To compare Ire1 dependent transcriptional responses to Candida albicans, we infected WT or IRE1ΔR macrophages for 4 hours before extracting RNA and sequencing via paired end Illumina reads
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| Contributor(s) |
McFadden M, O'Meara T |
| Citation(s) |
37873171 |
| |
| Submission date |
Sep 28, 2023 |
| Last update date |
Nov 14, 2023 |
| Contact name |
Teresa O'Meara |
| E-mail(s) |
tromeara@umich.edu
|
| Organization name |
University of Michigan
|
| Department |
Microbiology and Immunology
|
| Street address |
1150 W. Medical Center Dr
|
| City |
Ann Arbor |
| State/province |
MI |
| ZIP/Postal code |
48109 |
| Country |
USA |
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| Platforms (1) |
| GPL24247 |
Illumina NovaSeq 6000 (Mus musculus) |
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| Samples (12)
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| Relations |
| BioProject |
PRJNA1022148 |
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