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Synthesis, structure-activity relationships, and RARgamma-ligand interactions of nitrogen heteroarotinoids
1Department of Obstetrics & Gynecology, University of Oklahoma Health Sciences Center, P.O. Box 26901, Oklahoma City, Oklahoma 73190, USA.
Journal of Medicinal Chemistry
|September 10, 1999
Summary
New heteroarotinoids show promise as cancer therapeutics. These compounds effectively inhibit tumor cell growth and induce transglutaminase (TGase), a marker of retinoid activity, demonstrating potential for treating various cancers and skin disorders.
Area of Science:
- Medicinal Chemistry
- Pharmacology
- Oncology
Background:
- Retinoids, including retinoic acid, are crucial signaling molecules involved in cellular differentiation, proliferation, and apoptosis.
- Retinoid receptors, such as retinoic acid receptors (RARs) and retinoid X receptors (RXRs), mediate the biological effects of retinoids.
- Heteroarotinoids, synthetic retinoid analogs, are being investigated for their therapeutic potential in cancer and other diseases.
Purpose of the Study:
- To synthesize novel heteroarotinoids with a nitrogen atom in the first ring and a C-O linking group.
- To evaluate the synthesized compounds for their ability to activate RAR and RXR receptors.
- To assess the compounds' efficacy in inhibiting tumor cell growth and inducing transglutaminase (TGase).
Main Methods:
- Synthesis of three heteroarotinoid compounds: ethyl 4-(N,4,4-trimethyl-1,2,3,4-tetrahydroquinolinyl)benzoate (1), ethyl 4-(N,4,4,7-tetramethyl-1,2,3,4-tetrahydroquinolin-6-oyloxy)benzoate (2), and ethyl 4-(4,4-dimethyl-N-isopropyl-1,2,3,4-tetrahydroquinolin-6-oyloxy)benzoate (3).
- In vitro assays to determine transactivation of RAR and RXR receptors.
- Cell-based assays to measure tumor cell growth inhibition and TGase induction in various cancer cell lines (cervix, vulva, ovary, head/neck) and human erythroleukemic cells.
Main Results:
- Compounds 1, 2, and 3 activated RAR and RXR receptors with varying potencies and specificities. Compound 2 showed significant activation of RARgamma, similar to 9-cis-retinoic acid (9-c-RA).
- All three compounds inhibited the growth of cervix, vulva, ovarian, and head/neck tumor cell lines, with compound 2 being particularly potent against vulvar cell lines.
- Compounds 1-3 induced TGase production in human erythroleukemic cells, with compounds 2 and 3 being more potent activators than compound 1.
Conclusions:
- The synthesized heteroarotinoids exhibit significant anti-cancer activity through mechanisms independent of apoptosis.
- Compound 2, with its potent RARgamma activation, shows particular promise for treating skin disorders and cancers with high RARgamma expression.
- These findings highlight the potential of these novel heteroarotinoids as pharmaceutical agents for cancer therapy and dermatological conditions.
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