Pak1 and Pak2 are activated in recurrent respiratory papillomas, contributing to one pathway of Rac1-mediated COX-2 expression
Rong Wu
Center for Oncology and Cell Biology, The Feinstein Institute for Medical Research, North Shore-Long Island Jewish Health System, Manhasset, NY
Department of Otolaryngology and Communicative Disorders, Long Island Jewish Medical Center, New Hyde Park, NY
Department of Otorhinolaryngology-Head and Neck Surgery, Albert Einstein College of Medicine, Bronx, NY
Search for more papers by this authorAllan L. Abramson
Center for Oncology and Cell Biology, The Feinstein Institute for Medical Research, North Shore-Long Island Jewish Health System, Manhasset, NY
Department of Otolaryngology and Communicative Disorders, Long Island Jewish Medical Center, New Hyde Park, NY
Department of Otorhinolaryngology-Head and Neck Surgery, Albert Einstein College of Medicine, Bronx, NY
Search for more papers by this authorMarc H. Symons
Center for Oncology and Cell Biology, The Feinstein Institute for Medical Research, North Shore-Long Island Jewish Health System, Manhasset, NY
Department of Neurosurgery, North Shore University Hospital, Manhasset, NY
Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY
Search for more papers by this authorCorresponding Author
Bettie M. Steinberg
Center for Oncology and Cell Biology, The Feinstein Institute for Medical Research, North Shore-Long Island Jewish Health System, Manhasset, NY
Department of Otolaryngology and Communicative Disorders, Long Island Jewish Medical Center, New Hyde Park, NY
Department of Otorhinolaryngology-Head and Neck Surgery, Albert Einstein College of Medicine, Bronx, NY
Tel.: +(516)-562-1159, Fax: +(516)-562-1022
The Feinstein Institute for Medical Research, 350 Community Drive, Manhasset, NY 11030, USASearch for more papers by this authorRong Wu
Center for Oncology and Cell Biology, The Feinstein Institute for Medical Research, North Shore-Long Island Jewish Health System, Manhasset, NY
Department of Otolaryngology and Communicative Disorders, Long Island Jewish Medical Center, New Hyde Park, NY
Department of Otorhinolaryngology-Head and Neck Surgery, Albert Einstein College of Medicine, Bronx, NY
Search for more papers by this authorAllan L. Abramson
Center for Oncology and Cell Biology, The Feinstein Institute for Medical Research, North Shore-Long Island Jewish Health System, Manhasset, NY
Department of Otolaryngology and Communicative Disorders, Long Island Jewish Medical Center, New Hyde Park, NY
Department of Otorhinolaryngology-Head and Neck Surgery, Albert Einstein College of Medicine, Bronx, NY
Search for more papers by this authorMarc H. Symons
Center for Oncology and Cell Biology, The Feinstein Institute for Medical Research, North Shore-Long Island Jewish Health System, Manhasset, NY
Department of Neurosurgery, North Shore University Hospital, Manhasset, NY
Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY
Search for more papers by this authorCorresponding Author
Bettie M. Steinberg
Center for Oncology and Cell Biology, The Feinstein Institute for Medical Research, North Shore-Long Island Jewish Health System, Manhasset, NY
Department of Otolaryngology and Communicative Disorders, Long Island Jewish Medical Center, New Hyde Park, NY
Department of Otorhinolaryngology-Head and Neck Surgery, Albert Einstein College of Medicine, Bronx, NY
Tel.: +(516)-562-1159, Fax: +(516)-562-1022
The Feinstein Institute for Medical Research, 350 Community Drive, Manhasset, NY 11030, USASearch for more papers by this authorAbstract
Recurrent respiratory papillomas are premalignant tumors of the airway caused by human papillomaviruses (HPVs), primarily Types 6 and 11. We had reported that respiratory papillomas overexpress the epidermal growth factor receptor (EGFR), the small GTPase Rac1 and cyclooxygenase-2 (COX-2), and have enhanced nuclear factor-κB (NFκB) activation with decreased levels of IκB-β but not IκB-α. We also showed that EGFR-activated Rac1 mediates expression of COX-2 through activation of p38 mitogen-activated protein kinase. We have now asked whether the p21-activated kinases Pak1 or Pak2 mediate activation of p38 by Rac1 in papilloma cells. Pak1 and Pak2 were constitutively activated in vivo in papilloma tissue compared with normal epithelium, and Rac1 siRNA reduced the level of both phospho-Pak1 and phospho-Pak2 in cultured papilloma cells. Reduction in Pak1 and Pak2 with siRNA decreased the COX-2 expression in papilloma cells, increased the levels of IκB-β and reduced the nuclear localization of NF-κB, but had no effect on p38 phosphorylation. Our studies suggest that Rac1 → Pak1/Pak2 → NFκB is a separate pathway that contributes to the expression of COX-2 in HPV-induced papillomas, independently of the previously described Rac1 → p38 → COX-2 pathway.
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