title: Targeting heat shock protein 90 with CUDC-305 overcomes erlotinib resistance in non-small cell lung cancer.
abstract: CUDC-305 is a heat shock protein 90 (HSP90) inhibitor of the novel imidazopyridine class. Here, we report its activities in non-small cell lung cancer (NSCLC) cell lines with gene deregulations conferring primary or secondary resistance to epidermal growth factor receptor (EGFR) inhibitors. We show that CUDC-305 binds strongly to HSP90 extracted from erlotinib-resistant NSCLC cells (IC50 70 nmol/L). This result correlates well with the potent antiproliferative activity in erlotinib-resistant NSCLC cell lines (IC50 120-700 nmol/L) reported previously. Furthermore, it exhibits durable inhibition of multiple oncoproteins and induction of apoptosis in erlotinib-resistant NSCLC cells. CUDC-305 potently inhibits tumor growth in subcutaneous xenograft models of H1975 and A549, which harbor EGFR T790M mutation or K-ras mutations conferring acquired and primary erlotinib resistance, respectively. In addition, CUDC-305 significantly prolongs animal survival in orthotopic lung tumor models of H1975 and A549, which may be partially attributed to its preferential exposure in lung tissue. Furthermore, CUDC-305 is able to extend animal survival in a brain metastatic model of H1975, further confirming its ability to cross the blood-brain barrier. Correlating with its effects in various tumor models, CUDC-305 induces degradation of receptor tyrosine kinases and downstream signaling molecules of the PI3K/AKT and RAF/MEK/ERK pathways simultaneously, with concurrent induction of apoptosis in vivo. In a combination study, CUDC-305 enhanced the antitumor activity of a standard-of-care agent in the H1975 tumor model. These results suggest that CUDC-305 holds promise for the treatment of NSCLC with primary or acquired resistance to EGFR inhibitor therapy.
authors: Oncology, Curis, Inc., 45 Moulton Street, Cambridge, MA 02138, USA. rbao@curis.com
authors: Rudi
authors: R
authors: Bao
authors: Cheng-Jung
authors: CJ
authors: Lai
authors: Da-Gong
authors: DG
authors: Wang
authors: Hui
authors: H
authors: Qu
authors: Ling
authors: L
authors: Yin
authors: Brian
authors: B
authors: Zifcak
authors: Xu
authors: X
authors: Tao
authors: Jing
authors: J
authors: Wang
authors: Ruzanna
authors: R
authors: Atoyan
authors: Maria
authors: M
authors: Samson
authors: Jeffrey
authors: J
authors: Forrester
authors: Guang-Xin
authors: GX
authors: Xu
authors: Steven
authors: S
authors: DellaRocca
authors: Mylissa
authors: M
authors: Borek
authors: Hai-Xiao
authors: HX
authors: Zhai
authors: Xiong
authors: X
authors: Cai
authors: Changgeng
authors: C
authors: Qian
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D052117:Benzodioxoles / Q000378:metabolism / Q000493:pharmacokinetics / Q000494:pharmacology*; D002289:Carcinoma, Non-Small-Cell Lung / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D019008:Drug Resistance, Neoplasm / Q000187:drug effects; D004357:Drug Synergism; D000069347:Erlotinib Hydrochloride; D005260:Female; D018841:HSP90 Heat-Shock Proteins / Q000037:antagonists & inhibitors* / Q000378:metabolism; D006801:Humans; D007093:Imidazoles / Q000378:metabolism / Q000493:pharmacokinetics / Q000494:pharmacology*; D008175:Lung Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D051379:Mice; D008819:Mice, Nude; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D017239:Paclitaxel / Q000494:pharmacology; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D011799:Quinazolines / Q000494:pharmacology; D015398:Signal Transduction / Q000187:drug effects; D016019:Survival Analysis; D047368:Tumor Burden / Q000187:drug effects; D023041:Xenograft Model Antitumor Assays
chemical_list: D052117:Benzodioxoles; C543177:CUDC 305; D018841:HSP90 Heat-Shock Proteins; D007093:Imidazoles; D047428:Protein Kinase Inhibitors; D011799:Quinazolines; D000069347:Erlotinib Hydrochloride; D019869:Phosphatidylinositol 3-Kinases; D051057:Proto-Oncogene Proteins c-akt; D020928:Mitogen-Activated Protein Kinases; D017239:Paclitaxel