Relevance of glutamine metabolism to tumor cell growth

Tumor cells are characterized as rapidly dividing cells, and consequently they need a constant supply of both energy and nitrogen substrates. To resolve their energy requirements, they are able to use virtually any substrate: glucose [see 1 for a review; 2-4], lipids [5-7], ketone bodies [3], even amino acids [2-4, 8-10]. Nevertheless, the glucose and amino acid consumption by malignant tumor cells overcomes their own needs for their metabolic requirements; thus, tumor cells apparently waste glucose and amino acids without any profit [1, ll]. In this context, tumor has been described as a trap for glucose and nitrogen [12-13]. Tumors compete with the host for glucose [13-14]; this competence results in a progressive hypoglycemia [15] and host hepatic glycogen depletion [13]. In the same way, tumors compete for nitrogen compounds; this process produces in the host a negative nitrogen balance and a characteristic weight loss, and in the tumor a reciprocal nitrogen increase. The biochemical mechanisms underlying these phenomena still remain unclear. There is consensus that tumors increase protein degradation and reduce protein synthesis in the host tissues [16]. Alanine and glutamine are two efficient vehicles for the transport of nitrogen and carbon-skeletons between the different tissues in the living organism [17-18]. When a tumor develops, there is a net flux of amino acids from host tissues to the tumor [19]. Since ammonium ions are very toxic for most of the cells, glutamine is the physiological non-toxic ammonium vehicle between different mammalian tissues; therefore, glutamine is the main source of nitrogen for tumor cells [2, 20-21]. Thus, the presence of a tumor must produce great changes in the metabolism of glutamine in host tissues in such a way that host nitrogen metabolism is accomodated to tumor enhanced requirements of glutamine. To be used, glutamine must be transported into tumor mitochondria, where it is metabolized [21]. This implies two transport processes: the transport of glutamine across the plasma membrane and across the inner mitochondrial membrane. Once glutamine has been incorporated into tumor cells, this amino acid is quickly metabolized [12, 16, 19].

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