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Related Experiment Videos

Hsp70B' regulation and function.

Emily J Noonan1, Robert F Place, Charles Giardina

  • 1Department of Molecular and Cell Biology, University of Connecticut, Storrs, CT 06269-3125, USA. emily.noonan@gmail.com

Cell Stress & Chaperones
|October 6, 2007
PubMed
Summary
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Heat shock protein 70B (Hsp70B) and Hsp70B

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Stress Response

Background:

  • Heat shock proteins (Hsps) are molecular chaperones crucial for cellular homeostasis.
  • Hsp70B is a strictly inducible human Hsp70 chaperone with low basal expression.
  • Understanding the roles of specific Hsp70 family members in stress response is vital.

Purpose of the Study:

  • To investigate the coordinated regulation and distinct roles of Hsp70B and Hsp72 in human colon cell lines under proteotoxic stress.
  • To determine the activation pathways and stressor-specific induction of Hsp70B.
  • To elucidate the contribution of Hsp70B and Hsp72 to cell survival under proteotoxic conditions.

Main Methods:

  • siRNA-mediated knockdown of Hsp70B and Hsp72 in HT-29, SW-480, and CRL-1807 colon cell lines.

Related Experiment Videos

  • Assay of Hsp70B promoter activity using flow cytometry in HT-29eGFP cells.
  • Exposure of cells to heat stress and proteasome inhibitors to induce proteotoxic stress.

    • Main Results:

    • Hsp70B and Hsp72 are coordinately regulated in response to cellular stress.
    • Proteasome inhibition potently activates Hsp70B, while Hsp72 acts as the primary responder to increasing proteotoxic stress.
    • Knockdown of both Hsp70B and Hsp72 sensitizes cells to heat stress and proteasome inhibition.
    • ZnSO4 specifically induces Hsp70B in CRL-1807 cells, suggesting stressor-specific roles.

    Conclusions:

    • Hsp72 is the primary Hsp70 responder to proteotoxic stress, with Hsp70B acting as a secondary responder.
    • Hsp70B exhibits stressor-specific induction, as demonstrated by ZnSO4 treatment.
    • Both Hsp70B and Hsp72 are essential for maintaining cell viability under conditions of accumulating damaged proteins.
    • These findings highlight the critical role of Hsp70B in pathological conditions involving cell survival.