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CacyBP/SIP, a Hsp90 binding chaperone, in cellular stress response.

Agnieszka Góral1, Katarzyna Bartkowska1, Ruzanna L Djavadian1

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|April 17, 2018
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Summary

CacyBP/SIP protein protects cells from heat-induced damage and its levels increase under stress. Overexpressing CacyBP/SIP enhances cell survival, indicating its crucial role in cellular stress response.

Keywords:
CacyBP/SIPHsf1Stress response

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Stress Response Mechanisms

Background:

  • CacyBP/SIP (also known as SIP) interacts with Hsp90.
  • CacyBP/SIP confers protection against protein denaturation and aggregation caused by elevated temperatures.

Purpose of the Study:

  • To investigate the impact of various stress factors on CacyBP/SIP levels in HEp-2 cells.
  • To determine the role of CacyBP/SIP in cellular resistance to stress-induced death.
  • To elucidate the regulatory mechanism of CacyBP/SIP expression under stress conditions.

Main Methods:

  • Treatment of HEp-2 cells with hydrogen peroxide (H2O2) and radicicol.
  • Analysis of CacyBP/SIP protein levels via Western blotting.
  • Overexpression of CacyBP/SIP in HEp-2 cells.
  • Investigation of Hsf1 transcription factor binding to the CacyBP/SIP gene promoter.
  • Measurement of CacyBP/SIP protein levels in mouse brain structures.

Main Results:

  • Hydrogen peroxide (H2O2) and radicicol treatments significantly increased CacyBP/SIP levels by up to 40%.
  • HEp-2 cells overexpressing CacyBP/SIP exhibited increased resistance to stress-induced cell death.
  • The Hsf1 transcription factor was identified as a key regulator, binding to the CacyBP/SIP promoter and up-regulating its expression under stress.
  • Elevated CacyBP/SIP protein levels were observed in the thalamus/hypothalamus, hippocampus, and brainstem of stressed mice.

Conclusions:

  • CacyBP/SIP plays a significant role in cellular defense against various stress factors.
  • CacyBP/SIP expression is regulated by the Hsf1 transcription factor during cellular stress.
  • The findings suggest CacyBP/SIP is a crucial component of the in vivo stress response pathway, particularly in neural tissues.