Effect of Supplemental Dietary Glutamine on Methotrexate Concentrations in Tumors

Vicki Klimberg, Alex A. Pappas, Emmanuel Nwokedi, Joseph C. Jensen, J. Ralph Broadwater, Nicholas P. Lang, Kent C. Westbrook

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Abstract

This study evaluated the effects of supplemental dietary glutamine (GLN) on methotrexate sodium concentrations in tumors and serum of sarcoma-bearing rats following the initiation of methotrexate. After randomization to a GLN diet (+GLN) or GLN-free diet (−GLN), tumor-bearing rats received 20 mg/kg of methotrexate sodium by intraperitoneal injection. The provision of supplemental GLN in the diet increased methotrexate concentrations in tumor tissues at 24 and 48 hours (38.0±0.20 nmol/g for the +GLN group vs 28.8±0.10 nmol/g for the −GLN group and 35.6±0.18 nmol/g for the +GLN group vs 32.5±0.16 nmol/g for the −GLN group, respectively). Arterial methotrexate levels were elevated only at 48 hours (0.147±0.007 μm/L for the +GLN group vs 0.120±0.006 μm/L for the −GLN group). Tumor morphometrics were not different between the groups but significantly greater tumor volume loss was seen even at 24 hours (−2.41±1.3 cm3 for the +GLN group vs −0.016±0.9 cm3 for the −GLN group). Tumor glutaminase activity was suppressed in both groups at 48 hours, but more so in the +GLN group (0.94 ±0.13 μmol/g per hour for the +GLN group vs 1.47±0.22 μmol/g per hour for the −GLN group). This study suggests that GLN may have therapeutic as well as nutritional benefit in oncology patients.

Original languageEnglish (US)
Pages (from-to)1317-1320
Number of pages4
JournalArchives of Surgery
Volume127
Issue number11
DOIs
StatePublished - 1992
Externally publishedYes

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ASJC Scopus subject areas

  • Surgery

Cite this

Klimberg, V., Pappas, A. A., Nwokedi, E., Jensen, J. C., Broadwater, J. R., Lang, N. P., & Westbrook, K. C. (1992). Effect of Supplemental Dietary Glutamine on Methotrexate Concentrations in Tumors. Archives of Surgery, 127(11), 1317-1320. https://doi.org/10.1001/archsurg.1992.01420110063013