Institutions | About Us | Help | Gaeilge
rian logo

Go Back
Targeting the 19S proteasomal subunit, Rpt4, for the treatment of colon cancer.
Boland, Karen; Flanagan, Lorna; McCawley, Niamh; Pabari, Ritesh; Kay, Elaine W; McNamara, Deborah A; Murray, Frank; Byrne, Annette; Ramtoola, Zebunnissa; Concannon, Caoimhín; Prehn, Jochen
<p>This article is also available at <a href="" target="_blank" title=""></a></p> <p>Deregulation of the ubiquitin-proteasome pathway has been frequently observed in a number of malignancies. Using quantitative Western blotting of normal and matched tumour tissue, we here identified a significant increase in the 19S proteasome subunit Rpt4 in response to chemoradiation in locally advanced rectal cancer patients with unfavourable outcome. We therefore explored the potential of Rpt4 reduction as a therapeutic strategy in colorectal cancer (CRC). Utilizing siRNA to down regulate Rpt4 expression, we show that silencing of Rpt4 reduced proteasomal activity and induced endoplasmic reticulum stress. Gene silencing of Rpt4 also inhibited cell proliferation, reduced clonogenic survival and induced apoptosis in HCT-116 colon cancer cells. We next developed a cell penetrating peptide-based nanoparticle delivery system to achieve in vivo gene silencing of Rpt4. Administration of Rpt4 siRNA nanoparticles reduced tumour growth and improved survival in a HCT-116 colon cancer xenograft tumour model in vivo. Collectively, our data suggest that inhibition of Rpt4 represents a novel strategy for the treatment of CRC.</p>
Keyword(s): Chemotherapy; Colorectal cancer; Nanocomplexes; Proteasome; Rpt4; Medicine and Health Sciences; Physics; Physiology
Publication Date:
Type: Journal article
Peer-Reviewed: Yes
Institution: Royal College of Surgeons in Ireland
Citation(s): Boland K, Flanagan L, McCawley N, Pabari R, Kay EW, McNamara DA, Murray F, Byrne AT, Ramtoola Z, Concannon CG, Prehn JHM. Targeting the 19S proteasomal subunit, Rpt4, for the treatment of colon cancer. European Journal of Pharmacology. 2016; 780:53-64.
Publisher(s): Elsevier Science
File Format(s): application/pdf
Related Link(s):
First Indexed: 2016-06-04 06:19:45 Last Updated: 2019-02-19 07:15:23