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Purification of Ubiquitinated p53 Proteins from Mammalian Cells
10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

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Human Serum Albumin and the p53-Derived Peptide Fusion Protein Promotes Cytotoxicity Irrespective of p53 Status in

Ivana Roscoe, Michelle Parker, Daoyuan Dong

  • 1Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences , Shandong University , 44 West Culture Road , 250012 Ji'nan , Shandong , P. R. China.

Molecular Pharmaceutics
|September 19, 2018
PubMed

Insights

A novel human serum albumin (HSA) fusion protein, rHSA-p53i, effectively targets cancer cells through both p53-dependent and independent pathways. This dual-action therapeutic shows promise for treating various cancers, regardless of p53 status.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Therapeutics

Background:

  • Human serum albumin (HSA) fusion proteins offer a promising strategy for targeting intracellular pathways.
  • Previous work showed rHSA-p53i induces apoptosis via MDM2/MDMX binding, activating p53.
  • The role of rHSA-p53i in p53-independent apoptosis remained unexplored.

Purpose of the Study:

  • To investigate the mechanism of action of rHSA-p53i beyond p53 reactivation.
  • To determine if rHSA-p53i can induce apoptosis through p53-independent pathways.
  • To evaluate the therapeutic efficacy of rHSA-p53i in cancer models.

Main Methods:

  • Binding assays to assess interactions with Bcl-2 family proteins (Bcl-xL, Mcl-1).
  • Apoptosis induction studies in cancer cell lines with varying p53 status (MDA-MB-231, HeLa, SJSA-1).
  • In vivo efficacy studies using xenograft mouse tumor models (SJSA-1, MDA-MB-231).

Main Results:

  • rHSA-p53i binds and neutralizes anti-apoptotic Bcl-xL and Mcl-1 proteins.
  • This interaction leads to Bak displacement and intrinsic apoptosis, mimicking a p53-independent pathway.
  • rHSA-p53i demonstrated significant anti-tumor activity in xenograft models, irrespective of tumor p53 status.

Conclusions:

  • rHSA-p53i induces cancer cell death via both p53-dependent and independent apoptotic pathways.
  • The fusion protein targets at least four intracellular molecules, enhancing its therapeutic potential.
  • rHSA-p53i is a versatile therapeutic agent for diverse cancers and a potential drug delivery vehicle.
Keywords:
Bcl-2 proteinsalbumin fusion proteinapoptosisp53synergistic cancer therapy

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