Evaluation of Chromane-Based Bryostatin Analogues Prepared via Hydrogen-Mediated C-C Bond Formation: Potency Does Not Confer Bryostatin-like Biology.
The synthesis and biological evaluation of chromane-containing bryostatin analogues WN-2-WN-7 and the previously reported salicylate-based analogue WN-8 are described. Analogues WN-2-WN-7 are prepared through convergent assembly of the chromane-containing fragment B-I with the "binding domain" fragment A-I or its C26-des-methyl congener, fragment A-II. The synthesis of fragment B-I features enantioselective double C-H allylation of 1,3-propanediol to form the C2-symmetric diol 3 and Heck cyclization of bromo-diene 5 to form the chromane core. The synthesis of salicylate WN-8 is accomplished through the union of fragments A-III and B-II. The highest binding affinities for PKCα are observed for the C26-des-methyl analogues WN-3 (Ki= 63.9 nM) and WN-7 (Ki= 63.1 nM). All analogues, WN-2-WN-8, inhibited growth of Toledo cells, with the most potent analogue being WN-7. This response, however, does not distinguish between phorbol ester-like and bryostatin-like behavior. In contrast, while many of the analogues contain a conserved C-ring in the binding domain and other features common to analogues with bryostatin-like properties, all analogues evaluated in the U937 proliferation and cell attachment assays displayed phorbol ester-like and/or toxic behavior, including WN-8, for which "bryostatin-like PKC modulatory activities" previously was suggested solely on the basis of PKC binding. These results underscore the importance of considering downstream biological effects, as tumor suppression cannot be inferred from potent PKC binding.
Department of Chemistry and Biochemistry, University of Texas at Austin , Austin, Texas 78712, United States.
John M
JM
Ketcham
Department of Chemistry and Biochemistry, University of Texas at Austin , Austin, Texas 78712, United States.
Ivan
I
Volchkov
Department of Chemistry and Biochemistry, University of Texas at Austin , Austin, Texas 78712, United States.
Te-Yu
TY
Chen
Laboratory of Cancer Biology and Genetics, National Cancer Institute, National Institutes of Health , Bethesda, Maryland 20892-4255, United States.
Peter M
PM
Blumberg
Laboratory of Cancer Biology and Genetics, National Cancer Institute, National Institutes of Health , Bethesda, Maryland 20892-4255, United States.
Noemi
N
Kedei
Laboratory of Cancer Biology and Genetics, National Cancer Institute, National Institutes of Health , Bethesda, Maryland 20892-4255, United States.
Nancy E
NE
Lewin
Department of Chemistry and Biochemistry, University of Texas at Austin , Austin, Texas 78712, United States.
Michael J
MJ
Krische
D000970:Antineoplastic Agents / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D054713:Bryostatins / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002839:Chromans / Q000737:chemistry*; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D006859:Hydrogen / Q000737:chemistry*; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
D000970:Antineoplastic Agents; D054713:Bryostatins; D002839:Chromans; D014409:Tumor Necrosis Factor-alpha; D006859:Hydrogen; D051057:Proto-Oncogene Proteins c-akt
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