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Related Experiment Video

Updated: Apr 6, 2026

Fluorescent Leakage Assay to Investigate Membrane Destabilization by Cell-Penetrating Peptide

Fluorescent Leakage Assay to Investigate Membrane Destabilization by Cell-Penetrating Peptide

Published on: December 19, 2020

Toxicity, Immunogenicity, Uptake, and Kinetics Methods for CPPs.

Julia Uusna¹, Kent Langel, Ülo Langel

¹Laboratory of Molecular Biotechnology, Institute of Technology, Tartu University, Nooruse 1/517, Tartu, 50411, Estonia, julia.uusna@ut.ee.

Methods in Molecular Biology (Clifton, N.J.)

|July 24, 2015

Summary

This summary is machine-generated.

Cell-penetrating peptides (CPPs) are promising drug delivery vectors, but their clinical use is limited by cytotoxicity and immune responses. This study details methods to assess CPP safety and understand their cellular uptake mechanisms for improved delivery systems.

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Last Updated: Apr 6, 2026

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Area of Science:

Biochemistry
Molecular Biology
Pharmacology

Background:

Cell-penetrating peptides (CPPs) serve as effective vectors for delivering diverse payloads in vitro and in vivo.
Clinical applications of CPPs are hindered by potential cytotoxicity and induction of innate immune responses, necessitating thorough characterization.
Understanding CPP internalization mechanisms and kinetics is crucial for developing advanced cellular delivery systems.

Purpose of the Study:

To outline methodologies for evaluating the cytotoxicity and immunogenicity of CPPs.
To describe protocols for investigating CPP cellular uptake pathways and kinetics.
To provide a framework for assessing the clinical applicability of CPP-based delivery vehicles.

Main Methods:

In vitro cell viability assays and ELISA for measuring cytokine release in response to CPPs.
Assessment of caspase-1 activity to evaluate inflammatory potential.
Utilizing luciferin-CPP conjugates and endocytosis inhibitors to determine CPP uptake mechanisms.

Main Results:

Established protocols for in vitro and in vivo assessment of CPP cytotoxicity and immunogenicity.
Detailed methods for quantifying CPP-induced cytokine release and inflammatory markers.
Comprehensive approach to elucidate CPP endocytosis pathways.

Conclusions:

Robust methods are presented for evaluating CPP safety profiles, including cytotoxicity and immunogenicity.
The described techniques facilitate the study of CPP internalization kinetics and mechanisms.
This work supports the development of safer and more efficient CPP-based drug delivery systems.