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Robust Anticancer Efficacy of a Biologically Synthesized Tumor Acidity-Responsive and Autophagy-Inducing Functional

Guo-Bin Ding, Junqing Sun, Gengfeng Wu

  • 1CAS Key Laboratory for Biomedical Effects of Nanomaterials & Nanosafety, National Center for Nanoscience and Technology , Beijing 100190, China.

ACS Applied Materials & Interfaces
|January 24, 2018
PubMed

Insights

Researchers developed a novel protein delivery system (Trx-pHLIP-Beclin 1) to target tumors. This enhanced Beclin 1 delivery effectively inhibits cancer growth and induces autophagy with minimal side effects.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Beclin 1 is a key autophagy inducer crucial for autophagic cell death.
  • Targeted delivery of Beclin 1 holds potential for cancer therapy by inhibiting tumor growth.
  • Current limitations include Beclin 1's poor cellular internalization and non-specific biodistribution.

Purpose of the Study:

  • To develop a novel delivery system for Beclin 1 to enhance its therapeutic efficacy.
  • To investigate the tumor-targeting and anti-cancer properties of the engineered Beclin 1 protein.
  • To evaluate the safety and efficacy of the Beclin 1 delivery system in preclinical models.

Main Methods:

  • Constructed a functional protein (Trx-pHLIP-Beclin 1, TpB) combining thioredoxin, pH low insertion peptide, and Beclin 1.
  • Tested TpB's ability to deliver Beclin 1 to cancer cells under weakly acidic conditions (pH 6.5).
  • Assessed in vitro anti-proliferative and autophagy-inducing effects on breast and ovarian cancer cell lines.
  • Evaluated in vivo antitumor efficacy and biodistribution in an SKOV3 xenograft mouse model via intravenous injection.

Main Results:

  • TpB effectively transported Beclin 1 into cancer cells at pH 6.5.
  • TpB significantly inhibited tumor cell growth and proliferation while inducing autophagy.
  • In vivo studies showed preferential accumulation of TpB in tumors.
  • TpB demonstrated superior tumor growth inhibition compared to non-targeted Beclin 1 with no observed side effects.

Conclusions:

  • The novel Trx-pHLIP-Beclin 1 protein (TpB) system overcomes Beclin 1 delivery challenges.
  • TpB exhibits potent and specific antitumor activity through autophagy induction.
  • TpB represents a promising, safe, and efficient therapeutic agent for cancer treatment.
Keywords:
anticancer efficacyautophagy inductionbiological synthesisfunctional Beclin 1pHLIP

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