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Effect of a C-end rule modification on antitumor activity of thymosin α1

Fanwen Wang1, Caoying Xu1, Renhao Peng1

  • 1School of Life Science and Technology, China Pharmaceutical University, 24 Tongjiaxiang 24, Nanjing, 210009, China.

Biochimie
|August 11, 2018
PubMed

Insights

A novel peptide, thymosin α1-RGDR (Tα1-RGDR), demonstrates enhanced antitumor effects compared to thymosin α1 (Tα1) by improving tumor targeting. This peptide shows significant tumor growth inhibition and retains immunomodulatory activity.

Area of Science:

  • Biochemistry
  • Immunology
  • Oncology

Background:

  • Thymosin α1 (Tα1) is an approved cancer therapeutic, but its efficacy is limited by poor tumor targeting.
  • Developing targeted delivery systems is crucial for enhancing Tα1's therapeutic potential in cancer treatment.

Purpose of the Study:

  • To synthesize and evaluate the antitumor and immunological activities of a novel Tα1-RGDR peptide conjugate.
  • To compare the efficacy of Tα1-RGDR with wild-type Tα1 in preclinical cancer models.

Main Methods:

  • Peptide synthesis of Tα1-RGDR incorporating the RGDR tumor-homing motif.
  • Assessment of antitumor activity using the B16F10 melanoma model.
  • Evaluation of immunomodulatory effects in an immunologic suppression model.
  • Circular dichroism (CD) spectroscopy to analyze peptide conformation.
  • Molecular docking simulations with integrin αvβ3 and neuropilin-1.

Main Results:

  • Tα1-RGDR significantly inhibited B16F10 tumor growth at doses where Tα1 had minimal effect.
  • Tα1-RGDR exhibited comparable immunomodulatory effects to Tα1 in an immunologic suppression model.
  • CD spectroscopy confirmed a similar helical conformation for both Tα1 and Tα1-RGDR.
  • Docking studies supported the interaction of Tα1-RGDR with target receptors, including integrin αvβ3 and neuropilin-1.

Conclusions:

  • Tα1-RGDR demonstrates superior therapeutic potential over Tα1 due to enhanced tumor targeting.
  • The Tα1-RGDR peptide conjugate represents a promising strategy to overcome the limitations of Tα1 in cancer therapy.
  • Further investigation into Tα1-RGDR as a novel tumor-targeting therapeutic is warranted.
Keywords:
MelanomaThymosin α1Tumor homingTumor treatment

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