Keywords
galactic cosmic radiation; solar particle event; microgravity; hepatology; fibrosis; senescence
Abstract
With the start of NASA’s Artemis program, astronauts will soon leave the protection of Earth’s magnetosphere. Previous studies have established a theme of liver dysregulation associated with the harmful radiation and microgravity experienced in deep space. MicroRNAs (miRNAs) are key regulators of many of the pathologies observed during and after spaceflight, including hepatic fibrosis, making them strong potential biomarkers and therapeutic targets. Therefore, in the present study we investigated the effects of simulated microgravity, galactic cosmic radiation (GCR), and solar particle events (SPE) on miRNAs and mRNAs involved in the TGF-β signaling pathway, a key regulator of fibrosis, senescence, and inflammation in the liver. We also analyzed the ability of an antagomir treatment which targets miR-16-5p, miR-125b-5p, and let-7a-5p to modulate these spaceflight-associated changes in liver health. Our results indicate that the observed miRNA profile widely varied depending on whether GCR or SPE irradiation were administered. Likewise, while the antagomir treatment was successful at downregulating expression of its target mRNAs, the type of radiation received greatly influenced whether the miRNA shifts observed correlated with changes in downstream gene expression; the GCR group was the most effected and the SPE the least in terms of both miRNA and mRNA expression. Overall, the current study highlights the profound effects of cosmic radiation on the hepatic miRNA profile and confirms the potential of antagomir treatment as a therapeutic for spaceflight induced changes in expression.
Thesis Completion Year
2024
Thesis Completion Semester
Spring
Thesis Chair
Masternak, Michal
College
College of Medicine
Department
Burnett School of Biomedical Sciences
Thesis Discipline
Biomedical Sciences
Language
English
Access Status
Open Access
Length of Campus Access
None
Campus Location
Orlando (Main) Campus
STARS Citation
Hayslip, Natalie P., "Antagomir Treatment for Deep-Space Simulated Changes in the Liver of Mice" (2024). Honors Undergraduate Theses. 19.
https://stars.library.ucf.edu/hut2024/19