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Article Open Access

Telomere protein RAP1 levels are affected by cellular aging and oxidative stress

  • Authors:
    • Mark J. Swanson
    • Michelle E. Baribault
    • Joanna N. Israel
    • Nancy S. Bae
  • View Affiliations / Copyright

    Affiliations: Division of Basic Medical Sciences, Mercer University School of Medicine, Macon, GA 30207, USA, Department of Biochemistry, Arizona College of Osteopathic Medicine, Midwestern University, Glendale, AZ 85308, USA
    Copyright: © Swanson et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 181-187
    |
    Published online on: June 28, 2016
       https://doi.org/10.3892/br.2016.707
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Abstract

Telomeres are important for maintaining the integrity of the genome through the action of the shelterin complex. Previous studies indicted that the length of the telomere did not have an effect on the amount of the shelterin subunits; however, those experiments were performed using immortalized cells with stable telomere lengths. The interest of the present study was to observe how decreasing telomere lengths over successive generations would affect the shelterin subunits. As neonatal human dermal fibroblasts aged and their telomeres became shorter, the levels of the telomere‑binding protein telomeric repeat factor 2 (TRF2) decreased significantly. By contrast, the levels of one of its binding partners, repressor/activator protein 1 (RAP1), decreased to a lesser extent than would be expected from the decrease in TRF2. Other subunits, TERF1‑interacting nuclear factor 2 and protection of telomeres protein 1, remained stable. The decrease in RAP1 in the older cells occurred in the nuclear and cytoplasmic fractions. Hydrogen peroxide (H2O2) stress was used as an artificial means of aging in the cells, and this resulted in RAP1 levels decreasing, but the effect was only observed in the nuclear portion. Similar results were obtained using U251 glioblastoma cells treated with H2O2 or grown in serum‑depleted medium. The present findings indicate that TRF2 and RAP1 levels decrease as fibroblasts naturally age. RAP1 remains more stable compared to TRF2. RAP1 also responds to oxidative stress, but the response is different to that observed in aging.
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Copy and paste a formatted citation
Spandidos Publications style
Swanson MJ, Baribault ME, Israel JN and Bae NS: Telomere protein RAP1 levels are affected by cellular aging and oxidative stress. Biomed Rep 5: 181-187, 2016.
APA
Swanson, M.J., Baribault, M.E., Israel, J.N., & Bae, N.S. (2016). Telomere protein RAP1 levels are affected by cellular aging and oxidative stress. Biomedical Reports, 5, 181-187. https://doi.org/10.3892/br.2016.707
MLA
Swanson, M. J., Baribault, M. E., Israel, J. N., Bae, N. S."Telomere protein RAP1 levels are affected by cellular aging and oxidative stress". Biomedical Reports 5.2 (2016): 181-187.
Chicago
Swanson, M. J., Baribault, M. E., Israel, J. N., Bae, N. S."Telomere protein RAP1 levels are affected by cellular aging and oxidative stress". Biomedical Reports 5, no. 2 (2016): 181-187. https://doi.org/10.3892/br.2016.707
Copy and paste a formatted citation
x
Spandidos Publications style
Swanson MJ, Baribault ME, Israel JN and Bae NS: Telomere protein RAP1 levels are affected by cellular aging and oxidative stress. Biomed Rep 5: 181-187, 2016.
APA
Swanson, M.J., Baribault, M.E., Israel, J.N., & Bae, N.S. (2016). Telomere protein RAP1 levels are affected by cellular aging and oxidative stress. Biomedical Reports, 5, 181-187. https://doi.org/10.3892/br.2016.707
MLA
Swanson, M. J., Baribault, M. E., Israel, J. N., Bae, N. S."Telomere protein RAP1 levels are affected by cellular aging and oxidative stress". Biomedical Reports 5.2 (2016): 181-187.
Chicago
Swanson, M. J., Baribault, M. E., Israel, J. N., Bae, N. S."Telomere protein RAP1 levels are affected by cellular aging and oxidative stress". Biomedical Reports 5, no. 2 (2016): 181-187. https://doi.org/10.3892/br.2016.707
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