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Synthetic dimer of indole‐3‐carbinol: Second generation diet derived anti‐cancer agent in hormone sensitive prostate cancer
Author(s) -
Garikapaty Venkata P.S.,
Ashok Badithe T.,
Tadi Kiranmayi,
Mittelman Abraham,
Tiwari Raj K.
Publication year - 2005
Publication title -
the prostate
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.295
H-Index - 123
eISSN - 1097-0045
pISSN - 0270-4137
DOI - 10.1002/pros.20350
Subject(s) - lncap , prostate cancer , cancer research , androgen receptor , cyclin d1 , endocrinology , protein kinase b , medicine , cancer , chemistry , biology , cell cycle , biochemistry , phosphorylation
BACKGROUND Cruciferous vegetables have been found to have anti‐prostate cancer effects. The active compounds mediating these effects include indoles such as indole‐3‐carbinol (I3C) and isothiocyanates. I3C is unstable having tissue tropic effects and clinical utility has been partly addressed by the synthesis of a more stable dimer diindolylmethane (DIM). METHODS Anti‐proliferative activity was measured by XTT assay and cytosolic proteins quantitated by Western blot analysis. RESULTS DIM (IC 50 50 µM) is a better anti‐proliferative agent than I3C (IC 50 150 µM) in androgen dependent LNCaP cells, inhibits DNA synthesis, and growth of R1881 stimulated LNCaP cells. Androgen receptor (AR), cyclin D1, and cdk4, induced by R1881, are downregulated by DIM. DIM downregulates phosphorylated Akt and phosphatidyl inositol 3‐kinase and downstream inhibition of cyclin D1 and cdk4. CONCLUSION These studies provide evidence that DIM is a second‐generation chemopreventive agent with a viable cellular target and has clinical potential as an anti‐prostate cancer chemopreventive. © 2005 Wiley‐Liss, Inc.