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Fidarov AF, Vihma V, Bogautdinov RP, Morozkina SN, Shavva AG, Tikkanen MJ. Novel structural features increase the antioxidant effect of estrogen analogues on low density lipoprotein. J Steroid Biochem Mol Biol 2015; 154:142-9. [PMID: 26255276 DOI: 10.1016/j.jsbmb.2015.08.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 07/01/2015] [Accepted: 08/03/2015] [Indexed: 10/23/2022]
Abstract
Many known estrogens, both natural and synthetic, may act as antioxidants. We designed and synthesized 22 novel estrogen analogues with different ring junctions or substitutions, such as fluorine. We studied the antioxidant capacity in vitro of 35 synthetic estrogen analogues in aqueous lipoprotein solution by monitoring the formation of conjugated dienes. In addition to a free C-3 hydroxyl group, the two most active antioxidants had either a methyl group at C-4 and a six-carbon D-ring, or a fluorine atom at C-2 and an unsaturated B-ring. Extension of the D-ring increased the antioxidant capacity of 6-oxa estrogens. Compounds with a fluorine atom at C-2 were similar or more potent antioxidants compared with the principal endogenous estrogen, 17β-estradiol. In compounds with a substituted C-3 hydroxyl group, the antioxidant capacity could be significantly increased by additional double bonds in the C- or D-rings. In conclusion, we show that the antioxidant capacity of estrogen analogues could be increased by structural changes.
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Affiliation(s)
- Alan F Fidarov
- Department of Natural Compounds Chemistry, Faculty of Chemistry, St. Petersburg State University, Universitetskii pr. 26, Petrodvorets, 198504 St. Petersburg, Russia
| | - Veera Vihma
- Folkhälsan Research Center, Haartmaninkatu 8, Helsinki, 00290, Finland; University of Helsinki and Helsinki University Central Hospital, Heart and Lung Center, Haartmaninkatu 8, 00290 Helsinki, Finland.
| | - Roman P Bogautdinov
- Department of Natural Compounds Chemistry, Faculty of Chemistry, St. Petersburg State University, Universitetskii pr. 26, Petrodvorets, 198504 St. Petersburg, Russia
| | - Svetlana N Morozkina
- Department of Natural Compounds Chemistry, Faculty of Chemistry, St. Petersburg State University, Universitetskii pr. 26, Petrodvorets, 198504 St. Petersburg, Russia
| | - Alexander G Shavva
- Department of Natural Compounds Chemistry, Faculty of Chemistry, St. Petersburg State University, Universitetskii pr. 26, Petrodvorets, 198504 St. Petersburg, Russia
| | - Matti J Tikkanen
- Folkhälsan Research Center, Haartmaninkatu 8, Helsinki, 00290, Finland; University of Helsinki and Helsinki University Central Hospital, Heart and Lung Center, Haartmaninkatu 8, 00290 Helsinki, Finland
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Ramos-Enríquez MA, Medina-Campos ON, Pedraza-Chaverri J, Iglesias-Arteaga MA. Synthesis and radical scavenger properties of novel spirochromenes derived from steroid sapogenins. Steroids 2015; 98:132-7. [PMID: 25824324 DOI: 10.1016/j.steroids.2015.03.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 03/10/2015] [Accepted: 03/20/2015] [Indexed: 11/23/2022]
Abstract
Tandem aldol condensation between steroid sapogenins and hydroxylated benzaldehydes afforded steroidal spirochromenes. Compounds that bear a phenolic hydroxyl group at position C-6', obtained by a reaction with 2,5-dihydroxybenzaldehyde, showed approximately 80% of maximal radical scavenging activity in the 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) assay at 288 nM. In contrast, the starting steroid sapogenins and the spirochromenes without a phenolic group in the side chain proved to be inactive.
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Affiliation(s)
- Manuel A Ramos-Enríquez
- Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 México, D.F., Mexico
| | - Omar N Medina-Campos
- Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 México, D.F., Mexico
| | - José Pedraza-Chaverri
- Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 México, D.F., Mexico
| | - Martín A Iglesias-Arteaga
- Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 México, D.F., Mexico.
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