Abstract
Objectives: In this study, our aim was to test whether asparagine synthetase (ASNS) deficiency in pancreatic malignant cells can lead to sensitivity to asparagine starvation. We also investigated, in tumor-bearing mice, the efficacy of L-asparaginase entrapped in red blood cells (RBCs), a safe formulation, to induce asparagine depletion. Methods: First, ASNS expression was evaluated by immunohistochemistry in sporadic pancreatic ductal adenocarcinoma. Then, 4 pancreatic carcinoma cell lines were examined by Western blot, immunocytochemistry, and cytotoxicity assay to L-asparaginase and in asparagine-free or reduced-asparagine media. Finally, mice bearing the most in vitro sensitive cell line received RBC-entrapped L-asparaginase to investigate the anticancer efficacy of serum asparagine depletion in vivo. Results: Approximately 52% of pancreatic adenocarcinomas expressed no or low ASNS. The highest in vitro cytotoxicity to L-asparaginase or to reduced asparagine medium was observed with SW1990 line when ASNS expression was the lowest. In vivo sensitivity was confirmed for this cell line. Conclusions: Plasma asparagine depletion by RBC-entrapped L-asparaginase in selected patients having no low or no ASNS may be a promising therapeutic approach for pancreatic cancer.
Original language | English (US) |
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Pages (from-to) | 940-948 |
Number of pages | 9 |
Journal | Pancreas |
Volume | 41 |
Issue number | 6 |
DOIs | |
State | Published - Aug 2012 |
Keywords
- L-asparaginase
- L-asparagine synthetase
- cytotoxicity
- immunohistochemistry
- pancreatic carcinoma
- tissue micro array
ASJC Scopus subject areas
- Internal Medicine
- Endocrinology, Diabetes and Metabolism
- Hepatology
- Endocrinology