title: Enhancing the antitumor activity of ErbB blockade with histone deacetylase (HDAC) inhibition.
abstract: Molecular inhibition of the ErbB signaling pathway represents a promising cancer treatment strategy. Preclinical studies suggest that enhancement of antitumor activity can be achieved by maximizing ErbB signaling inhibition. Using cDNA microarrays, we identified histone deacetylase (HDAC) inhibitors as having strong potential to enhance the effects of anti-ErbB agents. Studies using a 20,000 element (20K) cDNA microarray demonstrate decreased transcript expression of ErbB1 (epidermal growth factor receptor) and ErbB2 in DU145 (prostate) and ErbB2 in SKBr3 (breast) cancer cell lines. Additional changes in the DU145 gene expression profile with potential interaction to ErbB signaling include down-regulation of caveolin-1 and hypoxia inducible factor 1-alpha (HIF1-alpha), and up-regulation of gelsolin, p19(INK4D) and Nur77. Findings were validated using real time RT-PCR and Western blot analysis. Enhanced proliferative inhibition, apoptosis induction and signaling inhibition were demonstrated when combining HDAC inhibition with ErbB blockade. These results suggest that used cooperatively, anti-ErbB agents and HDAC inhibitors may offer a promising strategy of dual targeted therapy. Additionally, microarray data suggest that the beneficial interaction of these agents may not derive solely from modulation of ErbB expression, but may result from effects on other oncogenic processes including angiogenesis, invasion and cell cycle kinetics.
authors.affiliation: Department of Human Oncology, University of Wisconsin, Madison, WI 53792-0600, USA.
authors.forename: Prakash
authors.initials: P
authors.lastname: Chinnaiyan
authors.forename: Sooryanarayana
authors.initials: S
authors.lastname: Varambally
authors.forename: Scott A
authors.initials: SA
authors.lastname: Tomlins
authors.forename: Soma
authors.initials: S
authors.lastname: Ray
authors.forename: Shyhmin
authors.initials: S
authors.lastname: Huang
authors.forename: Arul M
authors.initials: AM
authors.lastname: Chinnaiyan
authors.forename: Paul M
authors.initials: PM
authors.lastname: Harari
mesh_terms: D017209:Apoptosis; D015153:Blotting, Western; D001943:Breast Neoplasms / Q000473:pathology*; D049109:Cell Proliferation; D015536:Down-Regulation; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D066246:ErbB Receptors / Q000037:antagonists & inhibitors* / Q000502:physiology; D005260:Female; D020869:Gene Expression Profiling; D056572:Histone Deacetylase Inhibitors; D006655:Histone Deacetylases / Q000378:metabolism; D006801:Humans; D008297:Male; D009389:Neovascularization, Pathologic; D020411:Oligonucleotide Array Sequence Analysis; D011471:Prostatic Neoplasms / Q000473:pathology*; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000037:antagonists & inhibitors* / Q000096:biosynthesis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D014407:Tumor Cells, Cultured; D015854:Up-Regulation
chemical_list: D004791:Enzyme Inhibitors; D066246:ErbB Receptors; D056572:Histone Deacetylase Inhibitors; D006655:Histone Deacetylases; D018719:Erb-b2 Receptor Tyrosine Kinases