dorrigocin-a and migrastatin

Lactimidomycin (LTM, 1), iso-migrastatin (iso-MGS, 2) and migrastatin (MGS, 3) are macrolide antitumor antibiotics differing in macrolide ring size but all bearing a glutarimide side chain. To further develop these natural products and related analogs as drug candidates we have produced and evaluated the biological activities of a small library of iso-MGS and LTM-derived agents; congeners evaluated bear either the MGS scaffold or related acyclic (dorrigocin) scaffolds. Scratch wound-healing (SWH) assays with 4T1 mouse and MDA-MB-231 human mammary tumor cell lines, respectively, reveal structural elements crucial to inhibition of cell migration by these compounds. Moreover, two substances, 14 and 17, with activity far superior to that of MGS are unveiled by SWH assays.

Topics: Animals; Antibiotics, Antineoplastic; Cell Movement; Drug Design; Female; Humans; Macrolides; Mice; Molecular Structure; Piperidones; Structure-Activity Relationship

The synthesis of a range of analogues of the migrastatin macrolide core has been achieved from tri-O-acetyl-D-glucal in order to facilitate structure-activity studies. Efficient macrolactone formation was achieved in the presence of a reactive olefin, by increasing steric hindrance in the olefin environment. Acyclic analogues of migrastatin, structurally related to dorrigocin A, have also been prepared from D-glucal. The dorrigocin A analogues were prepared using the combination of the cross metathesis of ethyl 6-heptenoate with a glycal derivative and a subsequent allylic rearrangement-alkene isomerisation reaction (Perlin reaction). A synthetic route is thus provided that will enable dorrigocin A analogues to be prepared in parallel to migrastatin analogues in the search for novel anti-cancer and anti-arthritic therapeutics. Biological evaluation of one migrastatin and one dorrigocin A sugar derived analogue show that they inhibit proliferation and serum-induced migration of tumour and synovial cells at higher concentrations than evodiamine. Dorrigocin A analogues displayed similar potency to analogues of the migrastatin core.

Topics: Alkenes; Animals; Antibiotics, Antineoplastic; Calcium Gluconate; Cell Line, Tumor; Lactones; Macrolides; Models, Chemical; Piperidones; Stereoisomerism; Structure-Activity Relationship; Synovial Membrane

Fermentation of Streptomyces platensis NRRL18993 typically accumulated migrastation (1), dorrigocin A (2) and B (3), and 13-epi-dorrigocin A (5). Supplement of XAD-16 resin to the fermentation, in contrast, resulted in exclusive production of iso-migrastatin (4). In vitro studies showed that 1, 2, 3, and 5 are stable in aqueous solution but 4 undergoes rapid conversion into 1, 2, 3, and 5 under the same condition. These results revealed that 4 is the only bona fide natural product biosynthesized by S. platensis, and 1, 2, 3, and 5 are shunt metabolites of 4. This study also established the stereochemistry of 2-5 with the exception of C-11 for 3 and 4. A mechanism for H2O-mediated regio- and stereospecific rearrangement of 4 to 1, 2, 3, and 5 is proposed and supported by incorporation of 18O from H218O.

Topics: Chromatography, High Pressure Liquid; Lactones; Macrolides; Piperidones; Spectrometry, Mass, Electrospray Ionization; Stereoisomerism; Streptomyces