Abstract
In Marfan Syndrome (MFS), development of thoracic aortic aneurysms (TAAs) is characterized by degeneration of the medial layer of the aorta, including fragmentation and loss of elastic fibers, phenotypic changes in the smooth muscle cells, and an increase in the active form of transforming growth factor-β (TGFβ), which is thought to play a major role in development and progression of the aneurysm. We hypothesized that regional difference in elastic fiber fragmentation contributes to TGFβ activation and hence the localization of aneurysm formation. The fibrillin-1-deficient mgR/mgR mouse model of MFS was used to investigate regional changes in elastin fiber fragmentation, TGFβ activation and changes in gene expression as compared to wild-type littermates. Knockdown of Smad 2 and Smad 3 with shRNA was used to determine the role of the specific transcription factors in gene regulation in aortic smooth muscle cells. We show increased elastin fiber fragmentation in the regions associated with aneurysm formation and altered TGFβ signaling in these regions. Differential effects of Smad 2 and Smad 3 were observed in cultured smooth muscle cells by shRNA-mediated knockdown of expression of these transcription factors. Differential signaling through Smad 2 and Smad 3 in regions of active vascular remodeling likely contribute to aneurysm formation in the mgR/mgR model of MFS. Increased elastin fiber fragmentation in these regions is associated with these changes as compared to other regions of the thoracic aorta and may contribute to the changes in TGFβ signaling in these regions.
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Acknowledgements
We thank Erin Ashmore for excellent advice and assistance with all aspects of the laboratory, Christina Thiel for technical help with experiments, Dr. Jay Humphrey for critical reading of the manuscript and suggestions throughout the study and Dr. Jerome Trzeciakowski for suggestions regarding statistical analysis. Dr. Metz is now associated with Texas AgriLife Genomics and Bioinformatics Services, Bourlaug Center College Station, TX.
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This research was supported by NIH grant R21 EB004106 (EW) and HL-092380 (EW).
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Howell, D.W., Popovic, N., Metz, R.P. et al. Regional changes in elastic fiber organization and transforming growth factor β signaling in aortas from a mouse model of marfan syndrome. Cell Tissue Res 358, 807–819 (2014). https://doi.org/10.1007/s00441-014-1993-7
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DOI: https://doi.org/10.1007/s00441-014-1993-7