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Structure-activity relationships for mitomycin C and mitomycin A analogues.

K R Kunz¹, B S Iyengar, R T Dorr

¹Department of Pharmaceutical Sciences, University of Arizona, Tucson 85721.

Journal of Medicinal Chemistry

|July 1, 1991

Summary

Mitomycin C and A analogues showed varying antitumor activity based on assay type. Cell culture assays favored lipophilic and easily reduced compounds, unlike animal models.

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Area of Science:

Medicinal Chemistry
Pharmacology
Cancer Research

Background:

Mitomycin C and A are potent anticancer agents.
Understanding structure-activity relationships is crucial for drug development.

Purpose of the Study:

To investigate the relationship between mitomycin analogue structure and antitumor activity.
To compare activity in cell culture versus in vivo models.

Main Methods:

Screening of 30 mitomycin analogues against human tumor cell lines using MTT assay.
Assessing quinone reduction potential (E1/2) and lipophilicity (log P).
Comparing results with previous P388 leukemia mouse model data.

Main Results:

Antitumor activity correlated with reduction potential (E1/2) and lipophilicity (log P) in cell culture.

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Mitomycin C analogues correlated with E1/2, while mitomycin A analogues correlated with log P.

Cell culture results contrasted with in vivo data, where hydrophilic compounds were more active.

No correlation found with DNA binding strength.

Conclusions:

Assay type (cell culture vs. whole animal) significantly impacts mitomycin analogue potency.
Tumor cell uptake (log P) and bioreductive activation (E1/2) are key factors in cell culture potency.
Structure-activity relationships differ between in vitro and in vivo cancer models.