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Identification and Characterization of microRNAs Associated With Human β-Cell Loss in a Mouse Model
R Roat1, M M Hossain1, J Christopherson1
1The Sanford Project, Sanford Research, Sioux Falls, SD.
Abstract:
Currently there is no effective approach for monitoring early β-cell loss during islet graft rejection following human islet transplantation (HIT). Due to ethical and technical constraints, it is difficult to directly study biomarkers of islet destruction in humans. Here, we established a humanized mouse model with induced human β-cell death using adoptive lymphocyte transfer (ALT). Human islet grafts of ALT-treated mice had perigraft lymphocyte infiltration, fewer insulin+ β cells, and increased β-cell apoptosis. Islet-specific miR-375 was used to validate our model, and expression of miR-375 was significantly decreased in the grafts and increased in the circulation of ALT-treated mice before hyperglycemia. A NanoString expression assay was further used to profile 800 human miRNAs in the human islet grafts, and the results were validated using quantitative real-time polymerase chain reaction. We found that miR-4454 and miR-199a-5p were decreased in the human islet grafts following ALT and increased in the circulation prior to hyperglycemia. These data demonstrate that our in vivo model of induced human β-cell destruction is a robust method for identifying and characterizing circulating biomarkers, and suggest that miR-4454 and miR-199a-5p can serve as novel biomarkers associated with early human β-cell loss following HIT.
Insights
Researchers developed a mouse model to study early beta-cell loss after human islet transplantation (HIT). They identified circulating microRNAs, miR-4454 and miR-199a-5p, as potential biomarkers for detecting graft rejection.
Area of Science:
- Immunology
- Endocrinology
- Molecular Biology
Background:
- Human islet transplantation (HIT) lacks effective methods to monitor early beta-cell loss during graft rejection.
- Studying human islet destruction in vivo is challenging due to ethical and technical limitations.
Purpose of the Study:
- To establish a humanized mouse model for inducing and studying early human beta-cell death.
- To identify circulating biomarkers indicative of early beta-cell loss in HIT.
Main Methods:
- Developed a humanized mouse model using adoptive lymphocyte transfer (ALT) to induce human beta-cell death.
- Validated the model using islet-specific miR-375 as a biomarker.
- Utilized NanoString expression assay and quantitative real-time PCR to profile and validate microRNAs in grafts and circulation.
Main Results:
- ALT-treated mice showed characteristic signs of graft rejection, including inflammation, reduced insulin-positive beta cells, and increased apoptosis.
- Circulating miR-375 levels decreased in grafts and increased in circulation preceding hyperglycemia.
- Identified decreased graft expression and increased circulating levels of miR-4454 and miR-199a-5p prior to hyperglycemia.
Conclusions:
- The established mouse model is effective for identifying circulating biomarkers of early beta-cell loss in HIT.
- miR-4454 and miR-199a-5p show promise as novel biomarkers for early detection of beta-cell destruction following human islet transplantation.
