Thermo-pH-Sensitive Polypeptides Boost Protein Drug's Tumor Permeation and Pharmacology

Area of Science:

• Biotechnology
• Protein Engineering
• Drug Delivery

Background:

• Proteins face challenges like poor stability, short half-life, and limited cell permeability, hindering their therapeutic use.
• Existing modifications primarily improve stability and half-life, neglecting cell and tissue penetration issues.

Purpose of the Study:

• To develop a novel protein modification strategy using thermo-pH-sensitive elastin-like polypeptides (ELP(HX)n) to overcome protein drug limitations.
• To evaluate the efficacy of ELP(HX)n-fused L-asparaginase (ASP) as an intelligent protein therapeutic.

Main Methods:

• Designed thermo-pH-sensitive elastin-like polypeptides (ELP(HX)n) with histidine (H) for pH-responsiveness.
• Genetically fused L-asparaginase (ASP) with ELP(HV)60 to create ASP-ELP(HV)60.
• Compared ASP-ELP(HV)60 with native ASP and PEGylated ASP in terms of stability, half-life, and anti-tumor efficacy.

Main Results:

• ASP-ELP(HV)60 demonstrated significantly enhanced stability and extended half-life compared to ASP and PEGylated ASP.
• The modified protein exhibited improved penetration into tumor cells and tissues.
• Enhanced tumor cell and tissue penetration led to superior anti-tumor efficacy.

Conclusions:

• ELP(HX)n fusion is a versatile method to address intrinsic protein limitations for therapeutic applications.
• This approach enables the design of intelligent protein therapeutics, particularly for effective cancer treatment.
• Thermo-pH-sensitive ELP modification offers a promising strategy for developing advanced protein-based drugs.