THE ROLE OF PROTEIN CHAPERONES IN THE SURVIVAL FROM ANTHRACYCLINE-INDUCED OXIDATIVE STRESS IN SACCHAROMYCES CEREVISIAE.
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University. Tallahassee, FL. USA.
- Departments of Radiation Oncology and Biochemistry, Emory University, Atlanta, GA. USA.
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- Corresponding Author
Several S. cerevisiae deletion strains involving heat-shock response factors were among the most sensitive mutants identified in a previous genetic screen for doxorubicin hypersensitivity. These strains included ydj1Δ, ssz1Δ and zuo1Δ mutants. In addition, new1Δ, whose function was unknown, also displayed significant sensitivity to anthracyclines. We further investigated the basis for the sensitivity of these mutants. We determined that heat-shock could partially rescue the sensitivity of the strains to doxorubicin, including the homologous recombination mutant rad52Δ, which is sensitive to doxorubicin-mediated DNA double strand breaks (DSBs). However, none of the heat-shock response mutants were sensitive to DSBs, but were highly sensitive to reactive oxygen species (ROS) generated by quinone-ring-containing agents, such as anthracyclines and menadione. A fluorescent-based assay indicates that doxorubicin causes protein aggregation. Interestingly, the disaggregase mutant hsp104Δ is not sensitive to anthracyclines or menadione suggesting that Hsp104p does not play a role in disaggregating doxorubicin-induced protein aggregates. However New1p, which has been recently shown to be a novel disaggregase, is essential for cell viability after exposure to anthracyclines and menadione and it is not involved in thermotolerance. Our data suggest that in S. cerevisiae, doxorubicin produces protein aggregation through ROS and requires Ydj1p and New1p for resolution.
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[Jana S. Miles, Samantha J. Sojourner, Lahcen Jaafar, Aurellia Whitmore, Selina Darling-Reed and Hernan Flores-Rozas. (2018); THE ROLE OF PROTEIN CHAPERONES IN THE SURVIVAL FROM ANTHRACYCLINE-INDUCED OXIDATIVE STRESS IN SACCHAROMYCES CEREVISIAE. Int. J. of Adv. Res. 6 (3). 144-152] (ISSN 2320-5407). www.journalijar.com
College of Pharmacy and Pharmaceutical Sciences, Florida A&M University
Article DOI: 10.21474/IJAR01/6660 DOI URL: http://dx.doi.org/10.21474/IJAR01/6660
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