Journal article
RABL6A Promotes Oxaliplatin Resistance in Tumor Cells and Is a New Marker of Survival for Resected Pancreatic Ductal Adenocarcinoma Patients
Genes & cancer, Vol.4(7-8), pp.273-284
07/2013
DOI: 10.1177/1947601913501074
PMCID: PMC3807645
PMID: 24167655
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is characterized by early recurrence following pancreatectomy, rapid progression, and chemoresistance. Novel prognostic and predictive biomarkers are urgently needed to both stratify patients for clinical trials and select patients for adjuvant therapy regimens. This study sought to determine the biological significance of RABL6A (RAB, member RAS oncogene family-like protein 6 isoform A), a novel pancreatic protein, in PDAC. Analyses of RABL6A protein expression in PDAC specimens from 73 patients who underwent pancreatic resection showed that RABL6A levels are altered in 74% of tumors relative to adjacent benign ductal epithelium. Undetectable RABL6A expression, found in 7% (5/73) of patients, correlated with improved overall survival (range 41 to 118 months with 3/5 patients still living), while patients with RABL6A expression had a worse outcome (range 3.3 to 100 months, median survival 20.3 months) (
P
= 0.0134). In agreement with those findings, RABL6A expression was increased in pancreatic cancer cell lines compared to normal pancreatic epithelial cells, and its knockdown inhibited pancreatic cancer cell proliferation and induced apoptosis. Moreover, RABL6A depletion selectively sensitized cells to oxaliplatin-induced arrest and death. This work reveals that RABL6A promotes the proliferation, survival, and oxaliplatin resistance of PDAC cells, whereas its loss is associated with extended survival in patients with resected PDAC. Such data suggest RABL6A is a novel biomarker of PDAC and potential target for anticancer therapy.
Details
- Title: Subtitle
- RABL6A Promotes Oxaliplatin Resistance in Tumor Cells and Is a New Marker of Survival for Resected Pancreatic Ductal Adenocarcinoma Patients
- Creators
- Viviane P Muniz - Department of Surgery, College of Medicine, University of Iowa, Iowa City, IA, USARyan W Askeland - Department of Surgery, College of Medicine, University of Iowa, Iowa City, IA, USAXuefeng Zhang - Department of Surgery, College of Medicine, University of Iowa, Iowa City, IA, USASara M Reed - Department of Surgery, College of Medicine, University of Iowa, Iowa City, IA, USAVan S Tompkins - Department of Surgery, College of Medicine, University of Iowa, Iowa City, IA, USAJussara Hagen - Department of Surgery, College of Medicine, University of Iowa, Iowa City, IA, USABradley D McDowell - Department of Surgery, College of Medicine, University of Iowa, Iowa City, IA, USAAnna Button - Department of Surgery, College of Medicine, University of Iowa, Iowa City, IA, USABrian J Smith - Department of Surgery, College of Medicine, University of Iowa, Iowa City, IA, USAJamie A Weydert - Department of Surgery, College of Medicine, University of Iowa, Iowa City, IA, USAJames J Mezhir - Department of Surgery, College of Medicine, University of Iowa, Iowa City, IA, USADawn E Quelle - Department of Surgery, College of Medicine, University of Iowa, Iowa City, IA, USA
- Resource Type
- Journal article
- Publication Details
- Genes & cancer, Vol.4(7-8), pp.273-284
- Publisher
- SAGE Publications; Sage CA: Los Angeles, CA
- DOI
- 10.1177/1947601913501074
- PMID
- 24167655
- PMCID
- PMC3807645
- ISSN
- 1947-6019
- eISSN
- 1947-6027
- Language
- English
- Date published
- 07/2013
- Academic Unit
- Molecular Physiology and Biophysics; Pathology; Biostatistics; Neuroscience and Pharmacology; Holden Comprehensive Cancer Center
- Record Identifier
- 9983996059502771
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