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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
3
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pubmed:dateCreated |
1990-6-26
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pubmed:abstractText |
We have studied three new fluorine-substituted progestins (1-3) as potential imaging agents for progesterone receptor (PgR)-positive human breast tumors. Two of these are fluorine-substituted analogs of the potent progestin R5020 (promegestone), derived from (21S)-hydroxy R 5020 (RU 27987) and (21R)-hydroxy R 5020 (RU 27988), known metabolites of R 5020, which have affinities for PgR that are 116 and 4%, respectively (relative to R 5020 = 100%). These precursors were protected as their 3,3-dioxolane derivatives and converted to the 21-trifluoromethanesulfonate derivatives. Fluoride ion displacement, followed by acid-catalyzed deprotection, furnished in good yield the epimeric fluoroanalogs, (21S)- and (21R)-fluro R 5020 (1 and 2, affinities for PgR, 11 and 45%, respectively). These compounds were also prepared in 18F labeled form by the same route, in 14-32% overall radiochemical yield (decay corrected; synthesis time 90 min; sp. act. 370-1060 Ci/mmol). In tissue distribution studies in estrogen-primed immature rats, uterus-to-muscle ratios were 4.3 at 1 h for the 21S-epimer and 1.1 for the 21R-epimer, paralleling their relative binding affinities. Considerable metabolic defluorination was observed. The third fluorine-substituted progestin, DU 41165, has a novel retroprogesterone (9 beta, 10 alpha) structure, substituted with fluorine at C-6; its binding affinity is 145% relative to R 5020, and it was prepared in tritium-labeled form by acetylation of DU 41231, the 17 alpha-hydroxy precursor, with [3H]acetic anhydride. In estrogen-primed immature rats, this compound shows uterus-to-muscle ratios of 15 at 1 h, and 18-71 between 2 and 6 h, suggesting that compounds in this retroprogesterone series may be very promising candidates for selective imaging of PgR-positive tissues and tumors.
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pubmed:grant | |
pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical | |
pubmed:status |
MEDLINE
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pubmed:issn |
0883-2897
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
17
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
309-19
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pubmed:dateRevised |
2008-2-21
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pubmed:meshHeading |
pubmed-meshheading:2341287-Animals,
pubmed-meshheading:2341287-Breast Neoplasms,
pubmed-meshheading:2341287-Female,
pubmed-meshheading:2341287-Humans,
pubmed-meshheading:2341287-Neoplasms, Hormone-Dependent,
pubmed-meshheading:2341287-Norpregnadienes,
pubmed-meshheading:2341287-Pregnenediones,
pubmed-meshheading:2341287-Promegestone,
pubmed-meshheading:2341287-Rats,
pubmed-meshheading:2341287-Rats, Inbred Strains,
pubmed-meshheading:2341287-Tissue Distribution
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pubmed:year |
1990
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pubmed:articleTitle |
Target tissue uptake selectivity of three fluorine-substituted progestins: potential imaging agents for receptor-positive breast tumors.
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pubmed:affiliation |
Department of Chemistry, University of Illinois, Urbana 61801.
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pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, P.H.S.,
Research Support, U.S. Gov't, Non-P.H.S.
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