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Increased levels of hyper-stable protein aggregates in plasma of older adults

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Abstract

Proteins that misfold into hyper-stable/degradation-resistant species during aging may accumulate and disrupt protein homeostasis (i.e., proteostasis), thereby posing a survival risk to any organism. Using the method diagonal two-dimensional (D2D) SDS-PAGE, which separates hyper-stable SDS-resistant proteins at a proteomics level, we analyzed the plasma of healthy young (<30 years) and older (60–80 years) adults. We discovered the presence of soluble SDS-resistant protein aggregates in the plasma of older adults, but found significantly lower levels in the plasma of young adults. We identified the inflammation-related chaperone protein haptoglobin as the main component of the hyper-stable aggregates. This observation is consistent with the growing link between accumulations of protein aggregates and aging across many organisms. It is plausible higher amounts of SDS-resistant protein aggregates in the plasma of older adults may reflect a compromise in proteostasis that may potentially indicate cellular aging and/or disease risk. The results of this study have implications for further understanding the link between aging and the accumulation of protein aggregates, as well as potential for the development of aging-related biomarkers. More broadly, this novel application of D2D SDS-PAGE may be used to identify, quantify, and characterize the degradation-resistant protein aggregates in human plasma or any biological system.

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Acknowledgments

This work was supported in part by a grant (#1158375) from the National Science Foundation to W. Colón.

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Authors and Affiliations

  1. Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY, 12180, USA

    Ke Xia, Hannah Trasatti & Wilfredo Colón

  2. Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY, 12180, USA

    Ke Xia, Hannah Trasatti & Wilfredo Colón

  3. Albany Medical Center, 43 New Scotland Avenue, Albany, NY, 12208, USA

    James P. Wymer

Authors
  1. Ke Xia
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  2. Hannah Trasatti
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  3. James P. Wymer
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  4. Wilfredo Colón
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Correspondence to Wilfredo Colón.

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Xia, K., Trasatti, H., Wymer, J.P. et al. Increased levels of hyper-stable protein aggregates in plasma of older adults. AGE 38, 56 (2016). https://doi.org/10.1007/s11357-016-9919-9

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  • DOI: https://doi.org/10.1007/s11357-016-9919-9

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