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Marfan syndrome (MFS) is an autosomal dominant connective-tissue disorder affecting multiple systems, such as skeletal, cardiovascular, and ocular systems. MFS is predominantly caused by mutations in the gene, which encodes the fibrillin-1 protein, crucial for connective-tissue integrity. mutations lead to defective fibrillin, resulting in structurally compromised connective tissues. Additionally, these mutations cause aberrant TGF-β expression, contributing to vascular issues and increased susceptibility to radiation-induced fibrosis. Studies about the potential radiosensitivity of MFS are rare and generally limited to case reports. Here, we aimed to investigate the radiation-induced ATM nucleo-shuttling (RIANS) model to explore the molecular and cellular radiation response in fibroblasts from MFS patients. The results showed that the MFS fibroblast cell lines tested are associated with moderate but significant radiosensitivity, high yield of micronuclei, and impaired recognition of DNA double-strand breaks (DSBs) caused by a diminished RIANS. The diminished RIANS is supported by the sequestration of ATM protein in the cytoplasm not only by mutated FBN1 protein but also by overexpressed TGF-β. This report is the first molecular and cellular characterization of the radiation response of MFS fibroblasts and highlights the importance of the FBN1-TGF-β complex after irradiation.
Download full-text PDF |
Source |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11594578 | PMC |
http://dx.doi.org/10.3390/ijms252212313 | DOI Listing |
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