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Methods for Studying Drug Absorption: In vitro

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Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers

Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers

Published on: October 17, 2013

Permeability evaluation of gemcitabine-CPP6 conjugates in Caco-2 cells.

Abigail Ferreira^1,2, Sara Moreira^1,3, Rui Lapa²

¹OncoPharma Research Group, Center for Health Technology and Services Research (CINTESIS), Rua Dr. Plácido da Costa, 4200-450 Porto, Portugal.

|March 21, 2022

Summary

New gemcitabine prodrugs show enhanced delivery and permeability. Gemcitabine conjugates with cell-penetrating peptides (CPPs) improve intracellular drug delivery and overcome resistance, with Gem-CPP6-2 demonstrating high Caco-2 cell permeability.

Keywords:

Caco-2 Cell-Penetrating Peptides DMPK Permeability Solubility

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Area of Science:

Oncology
Drug Delivery
Biochemistry

Background:

Cancer remains a leading cause of mortality with increasing incidence.
Current chemotherapy, like gemcitabine, faces limitations including low bioavailability and drug resistance.
Novel strategies are needed to enhance gemcitabine's therapeutic efficacy and overcome resistance.

Purpose of the Study:

To evaluate the absorption and permeability of novel gemcitabine-hexapeptide conjugates (Gem-CPP6) across Caco-2 cell monolayers.
To compare the permeability of Gem-CPP6 conjugates with gemcitabine and cell-penetrating peptides (CPPs) alone.
To identify the most promising Gem-CPP6 conjugate for improved intracellular drug delivery.

Main Methods:

Development of three gemcitabine conjugates with cell-penetrating hexapeptides (CPP6).
Assessment of drug absorption and permeability using Caco-2 cell monolayers.
Comparative analysis of conjugate permeability versus gemcitabine and isolated CPPs.

Main Results:

Gemcitabine conjugates with CPP6 demonstrated improved intracellular delivery and resistance to enzymatic inactivation in prior studies.
CPP6-2 (KLPVMW) and its corresponding gemcitabine conjugate (Gem-CPP6-2) exhibited the highest permeability across Caco-2 cell monolayers.
This suggests enhanced absorption and potential for improved bioavailability of the conjugate.

Conclusions:

Gemcitabine-CPP6 conjugates represent a promising strategy for enhancing gemcitabine delivery and overcoming therapeutic limitations.
The Gem-CPP6-2 conjugate shows significant potential for improved absorption and permeability, warranting further investigation.
These findings contribute to the development of more effective cancer chemotherapies.