Mammalian Heat Shock Protein Hsp105: The Hsp70 Inducer and a Potent Target for Cancer Therapy

  • Youhei SaitoEmail author
  • Yuji Nakayama
Part of the Heat Shock Proteins book series (HESP, volume 14)


Major heat shock protein Hsp70 prevents protein aggregation and assists protein folding as molecular chaperone. Hsp70 also regulates apoptosis, senescence, and autophagy. Increased expression of Hsp70 causes the drug resistance of cancer cells. Hsp105, a mammalian heat shock protein, consists of Hsp105α and its splicing isoform Hsp105β. Hsp105α constitutively expresses in cytoplasm and functions as molecular chaperone and apoptotic regulator. Hsp105β is specifically expressed in nucleus under stressed condition and induces Hsp70 expression through the activation of Stat3. Recently, we identified that the novel regulators of Hsp105β-mediated Hsp70 induction including the transcriptional co-activator of Stat3. Additionally, we reveled that Hsp105α but not Hsp105β interacts with HIF-1α in nucleus and affects to the transcriptional activation of HIF-1. Since Hsp105 is overexpressed in several tumors including solid tumor, these evidences indicate that the nuclear expression of Hsp105α seems to function as a malignant factor of cancer through the induction of Hsp70 and the activation of the tumorigenic Stat3 and HIF-1 signaling pathways. In this chapter, we will introduce the recent our observations and discuss the possibility that the nuclear overexpression of Hsp105 is a useful marker for cancer prognosis and diagnosis.


HIF-1 Hsp70 Hsp70 inducer Hsp105/110 Stat3 Tumor marker 





Endoplasmic reticulum


Esophageal squamous cell carcinoma


Janus kinase


Hypoxia-inducible factor


Heat shock cognate


Heat shock factor


Heat shock protein


Nuclear export signal


Nuclear localization signal


N-myc interactor


Prolyl hydroxylase


Small nuclear ribonucleoprotein


Signal transducer and activator of transcription


Von Hippel-Lindau



This work was supported, in part, by JSPS KAKENHI (Grant numbers: 26870701, YS and 16K08253, YN), the Kyoto Pharmaceutical University Fund for the Promotion of Scientific Research (YS), and the MEXT-Supported Program for the Strategic Research Foundation at Private Universities (Grant number: S1311035).


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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Biochemistry and Molecular BiologyKyoto Pharmaceutical UniversityKyotoJapan

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