2023 Fiscal Year Research-status Report
Translocation of a gut pathobiont drives acute kidney injury
| Project/Area Number |
23K15246
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| Research Institution | Kanazawa University |
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Principal Investigator |
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| Project Period (FY) |
2023-04-01 – 2026-03-31
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| Keywords | bacterial translocation / gut dysbiosis |
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| Outline of Annual Research Achievements |
In the first year of project, we focused on confirming our hypothesis that gut microbiota may contribute to the pathophysiology of acute kidney injury (AKI). We performed renal unilateral ischemia-reperfusion (IR) in C57BL/6J mice to induce AKI, then investigated evidence of bacterial translocation.
Following the time-course study, we observed an increase in the load of bacteria X load in the feces, suggesting gut dysbiosis after IR induction. We examined and recognized intestinal injuries that could be direct causes of bacterial translocation.We also detected X DNA in the circulation of IR mice, indicating the translocation of bacterial products in AKI mice. By administering fluorescence-labeled X and using multiple immunofluorescence staining, we explored the presence of X in the immune cells (macrophages) and proximal tubules of IR kidneys.
We also investigated the effect of X DNA to the cultured cells and AKI models. The in vitro results showed that a the low amount of X DNA activated bone marrow-derived macrophages (BMDMs) to produce pro-inflammatory cytokines, while a higher concentration of X DNA was required to induce inflammation and injury in kidney tubular cells. Additionally, we confirmed the pathogenic role of X DNA in the AKI condition in vivo. The administration of X DNA augmented renal injuries after IR induction by promoting inflammation.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
This year is the first year we conducted the project as the originally planned and achieved promising and important data. Repeated experiments identified and confirmed key translocated bacteria in AKI mice. We also explored target cells and dose-dependent pathogenic impacts of X DNA in both cultured cells and murine AKI models. These results are new findings and have not been reported until now. Therefore, it is considered that progress is generally going well.
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| Strategy for Future Research Activity |
Next year, we will focus on finding the molecular mechanism to explore the origin and pathways through which X DNA translocates, then activates and accelerates AKI injury. Base on these results, we hope to select and screen potential methods or drugs to prevents AKI progression by targeting X. In addition, we will collect the blood samples of patients with AKI and measure X DNA levels. We will also investigate the correlation of X DNA levels and clinical characteristics to test whether X could be a potential prognostic marker of human AKI.
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| Causes of Carryover |
This year is the first year of the project, so we focused on performing and repeating basic experiments to achieve reliable demonstration data. We utilized shared and available samples, reagents or items in our laboratory. In addition, we needed to optimize protocols, so the clinical samples were not collected. Next year, we will use the grant to purchase reagents, mice and other items to perform more advanced experiments to explore deeper mechanism, as well as begin collecting clinical samples.
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Research Products
(1 results)
