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Updated: Nov 18, 2025
A Mouse Model for Pathogen-induced Chronic Inflammation at Local and Systemic Sites
Published on: August 8, 2014
Characterization of a Murine Model System to Study MicroRNA-147 During Inflammatory Organ Injury
Boyun Kim1, Victor Guaregua1, Xuebo Chen1
1Department of Anesthesiology, McGovern Medical School, University of Texas Health Science Center at Houston, 6431 Fannin Street, Houston, TX, 77030, USA.
Abstract:
Inflammatory organ injury and sepsis have profound impacts on the morbidity and mortality of surgical and critical care patients. MicroRNAs are small RNAs composed of 20-25 nucleotides that have a significant contribution to gene regulation. MicroRNA-147 (miR-147), in particular, has been shown to have an emerging role in different physiological functions such as cell cycle regulation and inflammatory responses. However, animal model systems to study tissue-specific functions of miR-147 during inflammatory conditions in vivo are lacking. In the present study, we characterize miR-147 expression in different organs and cell types. Next, we generated a transgenic mouse line with a floxed miR-147 gene. Subsequently, we used this mouse line to generate mice with whole-body deletion of miR-147 (miR-147 -/-) by crossing "floxed" miR-147 mice with transgenic mice expressing Cre recombinase in all tissues (CMVcre mice). Systematic analysis of miR-147 -/- mice demonstrates normal growth, development, and off-spring. In addition, deletion of the target gene in different organs was successful at baseline or during inflammation, including the heart, intestine, stomach, liver, spleen, bone marrow, lungs, kidneys, or stomach. Moreover, miR-147 -/- mice have identical baseline inflammatory gene expression compared to C57BL/6 mice, except elevated IL-6 expression in the spleen (7.5 fold, p < 0.05). Taken together, our data show the successful development of a transgenic animal model for tissue and cell-specific deletion of miR-147 that can be used to study the functional roles of miR-147 during inflammatory organ injury.
Insights
Researchers developed a new transgenic mouse model to study microRNA-147 (miR-147) in inflammatory conditions. This model allows for targeted gene deletion, aiding the investigation of miR-147
Area of Science:
- Molecular Biology
- Genetics
- Immunology
- Critical Care Medicine
Background:
- Inflammatory organ injury and sepsis significantly impact surgical and critical care patient outcomes.
- MicroRNAs (miRNAs), including microRNA-147 (miR-147), are key regulators of gene expression with roles in inflammation.
- A lack of in vivo animal models hinders the study of tissue-specific miR-147 functions during inflammation.
Purpose of the Study:
- To characterize miR-147 expression across various organs and cell types.
- To develop a transgenic mouse model for studying tissue-specific miR-147 deletion in inflammatory conditions.
- To investigate the baseline and inflammation-induced effects of miR-147 deletion in vivo.
Main Methods:
- Expression profiling of miR-147 in different organs and cell types.
- Generation of a floxed miR-147 transgenic mouse line.
- Creation of whole-body miR-147 knockout mice (miR-147-/-) using CMVcre recombination.
- Assessment of miR-147 deletion efficacy in various tissues under baseline and inflammatory states.
- Comparative analysis of baseline inflammatory gene expression between miR-147-/- and wild-type mice.
Main Results:
- miR-147-/- mice exhibited normal growth, development, and reproductive capacity.
- Successful deletion of miR-147 was confirmed in multiple organs (heart, intestine, liver, spleen, lungs, kidneys) at baseline and during inflammation.
- Baseline inflammatory gene expression was largely similar to wild-type mice, with a notable exception of elevated IL-6 in the spleen of miR-147-/- mice.
Conclusions:
- A novel transgenic mouse model enabling tissue-specific deletion of miR-147 has been successfully developed.
- This model provides a valuable tool for dissecting the functional roles of miR-147 in inflammatory organ injury.
- The findings lay the groundwork for future research into miR-147's specific contributions to inflammatory processes in vivo.
