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HSP70 induction by bleomycin metal core analogs.

Taha F S Ali1, Naomi Taira2, Kana Iwamaru2

  • 1Medicinal and Biological Chemistry Science Farm Joint Research Laboratory, Faculty of Life Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, Kumamoto 862-0973, Japan; Department of Medicinal Chemistry, Faculty of Pharmacy, Minia University, Minia 61519, Egypt.

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Summary

This study explores bleomycin analogs for inducing heat shock protein 70 (HSP70), a key protein against diseases. A derivative, DHPH-1Trt, shows promising reduced toxicity and enhanced HSP70 induction for potential clinical use.

Keywords:
BleomycinHSP70 inductionMetal chelatorPC-12 cells

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Heat shock protein 70 (HSP70) induction is a recognized therapeutic strategy for various diseases.
  • Bleomycin, an antitumor antibiotic, induces oxidative stress and is investigated for its HSP70 induction potential.

Purpose of the Study:

  • To evaluate the HSP70 induction capability of bleomycin and its metal core analogs.
  • To identify novel compounds with enhanced HSP70 induction activity and reduced toxicity for potential therapeutic applications.

Main Methods:

  • Screening of bleomycin and six metal core analogs for HSP70 induction in pheochromocytoma, T cell, and monocytic cell lines.
  • Assessment of mechanism via HSP70 mRNA levels.
  • Synthesis and evaluation of new bleomycin derivatives for improved efficacy and safety.

Main Results:

  • Compound HPH-1Trt (10 μM) effectively induced HSP70 by increasing HSP70 mRNA in tested cell lines, but exhibited toxicity at higher concentrations.
  • Two novel derivatives were synthesized, with DHPH-1Trt demonstrating superior HSP70 induction activity and reduced toxicity compared to HPH-1Trt.

Conclusions:

  • Bleomycin analogs can effectively induce HSP70, suggesting a potential therapeutic pathway.
  • DHPH-1Trt represents a promising candidate for a new HSP70 inducer with improved therapeutic index, warranting further clinical investigation.