Transmural advective transport of solute and fluid was investigated in mouse carotid arteries with either a genetic knockout of fibulin-5 (Fbln5−/−) or treatment with elastase to determine the influence of a disrupted elastic fiber matrix on wall transport properties. Fibulin-5 is an important director of elastic fiber assembly. Arteries from Fbln5−/− mice have a loose, noncontinuous elastic fiber network and were hypothesized to have reduced resistance to advective transport. Experiments were carried out ex vivo at physiological pressure and axial stretch. Hydraulic conductance () was measured to be 4.99 × 10−6±8.94 × 10−7, 3.18−5±1.13 × 10−5 (p < 0.01), and 3.57 × 10−5 ±1.77 × 10−5 (p < 0.01) mm·s−1·mmHg−1 for wild-type, Fbln5−/−, and elastase-treated carotids, respectively. Solute fluxes of 4, 70, and 150 kDa fluorescein isothiocyanate (FITC)-dextran were statistically increased in Fbln5−/− compared to wild-type by a factor of 4, 22, and 3, respectively. Similarly, elastase-treated carotids demonstrated a 27- and 13-fold increase in net solute flux of 70 and 150 kDa FITC-dextran, respectively, compared to untreated carotids, and 4 kDa FITC-dextran was unchanged between these groups. Solute uptake of 4 and 70 kDa FITC-dextran within Fbln5−/− carotids was decreased compared to wild-type for all investigated time points. These changes in transport properties of elastic fiber compromised arteries have important implications for the kinetics of biomolecules and pharmaceuticals in arterial tissue following elastic fiber degradation due to aging or vascular disease.
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February 2019
Research-Article
Elastic Fiber Fragmentation Increases Transmural Hydraulic Conductance and Solute Transport in Mouse Arteries
Austin J. Cocciolone,
Austin J. Cocciolone
Department of Biomedical Engineering,
Washington University,
St. Louis, MO 63130
Washington University,
St. Louis, MO 63130
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Elizabeth O. Johnson,
Elizabeth O. Johnson
Department of Mechanical Engineering and
Materials Science,
Washington University,
St. Louis, MO 63130
Materials Science,
Washington University,
St. Louis, MO 63130
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Jin-Yu Shao,
Jin-Yu Shao
Department of Biomedical Engineering,
Washington University,
St. Louis, MO 63130
Washington University,
St. Louis, MO 63130
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Jessica E. Wagenseil
Jessica E. Wagenseil
Department of Mechanical Engineering and
Materials Science,
Washington University,
St. Louis, MO 63130
e-mail: jessica.wagenseil@wustl.edu
Materials Science,
Washington University,
St. Louis, MO 63130
e-mail: jessica.wagenseil@wustl.edu
Search for other works by this author on:
Austin J. Cocciolone
Department of Biomedical Engineering,
Washington University,
St. Louis, MO 63130
Washington University,
St. Louis, MO 63130
Elizabeth O. Johnson
Department of Mechanical Engineering and
Materials Science,
Washington University,
St. Louis, MO 63130
Materials Science,
Washington University,
St. Louis, MO 63130
Jin-Yu Shao
Department of Biomedical Engineering,
Washington University,
St. Louis, MO 63130
Washington University,
St. Louis, MO 63130
Jessica E. Wagenseil
Department of Mechanical Engineering and
Materials Science,
Washington University,
St. Louis, MO 63130
e-mail: jessica.wagenseil@wustl.edu
Materials Science,
Washington University,
St. Louis, MO 63130
e-mail: jessica.wagenseil@wustl.edu
1Corresponding author.
Manuscript received August 3, 2018; final manuscript received November 12, 2018; published online December 19, 2018. Assoc. Editor: Seungik Baek.
J Biomech Eng. Feb 2019, 141(2): 021013 (10 pages)
Published Online: December 19, 2018
Article history
Received:
August 3, 2018
Revised:
November 12, 2018
Citation
Cocciolone, A. J., Johnson, E. O., Shao, J., and Wagenseil, J. E. (December 19, 2018). "Elastic Fiber Fragmentation Increases Transmural Hydraulic Conductance and Solute Transport in Mouse Arteries." ASME. J Biomech Eng. February 2019; 141(2): 021013. https://doi.org/10.1115/1.4042173
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