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Prodrugs

Prodrugs

Prodrugs are a class of pharmaceutical compounds that undergo a biotransformation process within the body to be converted into a pharmacologically active drug. Prodrugs are designed to improve the therapeutic properties of the parent drug, such as enhancing bioavailability, increasing stability, or reducing toxicity. The concept of prodrugs revolves around modifying the chemical structure of the original drug to make it more effective or convenient for administration.
Prodrugs help overcome...

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Updated: Jun 18, 2025

Pretargeted Radioimmunotherapy Based on the Inverse Electron Demand Diels-Alder Reaction

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Published on: January 29, 2019

Extended Pharmacokinetics Improve Site-Specific Prodrug Activation Using Radiation.

Jeremy M Quintana^1,2, Mikyung Kang^1,2, Huiyu Hu^1,3

¹Center for Systems Biology, Massachusetts General Hospital Research Institute, Boston, Massachusetts 02114, United States.

ACS Central Science

|July 29, 2024

Summary

This summary is machine-generated.

Researchers developed radiation-activated chemotherapy prodrugs for sustained, localized tumor treatment. An albumin-bound prodrug of MMAE demonstrated significant tumor growth blockage and enhanced drug delivery with minimal toxicity.

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Area of Science:

Oncology
Radiochemistry
Pharmacology

Background:

Radiotherapy is a common cancer treatment that can activate prodrugs.
Achieving sustained and localized prodrug activation in tumors remains a challenge.
Off-target tissue toxicity is a concern with current methods.

Purpose of the Study:

To develop novel radiation-activated chemotherapy prodrugs.
To establish a computational framework for understanding prodrug pharmacokinetics and pharmacodynamics (PK/PD).
To demonstrate sustained and localized *in vivo* prodrug activation.

Main Methods:

Synthesis of novel phenyl-azide-caged, radiation-activated drug-conjugates.
Focus on an albumin-bound prodrug of monomethyl auristatin E (MMAE).
In vivo efficacy and toxicity studies in mice.
Computational modeling of PK/PD behaviors.

Main Results:

The albumin-bound MMAE prodrug effectively blocked tumor growth in mice.
Achieved a 130-fold greater concentration of activated drug in irradiated tumors versus unirradiated tissue.
Demonstrated 7.5-fold higher efficiency compared to a non-albumin-bound prodrug.
Exhibited no significant toxicity compared to free or cathepsin-activatable drugs.

Conclusions:

Extended prodrug circulation can enhance localized and cumulative drug activation.
This approach is particularly beneficial for payloads with low vascular permeability and diffusivity.
The study provides a quantitative PK/PD framework and proof-of-concept for improved localized cancer therapy.