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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.
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.
- 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.