Prominent Glutamine Oxidation Activity in Mitochondria of Hematopoietic Tumors

Wafa H. Abou-Khalil, Samir Abou-Khalil, A. Adel Yunis

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Abstract

Well-coupled mitochondria of hematopoietic tumors were isolated from mouse erythroleukemia and rat chloroma tumors grown in male DBA/2J mice and Long-Evans rats, respectively. We used erythroleukemia and chloroma mitochondria to determine their ability to utilize glutamine as an energy source for adenosine triphosphate formation. Oxypolarographic tests showed the following. (a) Presence of a prominent glutaminase activity in erythroleukemia and chloroma mitochondria is evidenced by their active glutamine-supported respiratory state 3. (b) Glutamine oxidation is mediated through a nicotinamide adenine dinudeotide-linked reaction inhibited by rotenone. (c) Under similar conditions, mitochondria isolated from rabbit bone marrow have shown a feeble glutamine oxidation activity, while in mitochondria from rat liver the activity was not detectable and in those from rat kidney it was prominent as expected. (d) The determination of apparent Km and Vm« values for substrate-supported adenosine triphosphate formation has shown 8-to 10-fold lower Km values for glutamine oxidation as compared to that of glutamate, with virtually the same Vm» for each substrate in each mitochondria. These results clearly show the presence of a high glutamine oxidation activity in erythroleukemia and chloroma mitochondria and suggest that one of the glutamine hydrolysis products in those mitochondria may have an important role in supplying adenosine triphosphate in the corresponding malignant cells.

Original languageEnglish (US)
Pages (from-to)1990-1993
Number of pages4
JournalCancer Research
Volume43
Issue number5
StatePublished - May 1 1983

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ASJC Scopus subject areas

  • Oncology
  • Cancer Research

Cite this

Abou-Khalil, W. H., Abou-Khalil, S., & Yunis, A. A. (1983). Prominent Glutamine Oxidation Activity in Mitochondria of Hematopoietic Tumors. Cancer Research, 43(5), 1990-1993.