Transport Metabolons and Acid/Base Balance in Tumor Cells
نویسندگان
چکیده
منابع مشابه
Transport metabolons with carbonic anhydrases
THE CONCEPT OF THE TRANSPORT METABOLON A metabolon has been defined as a “temporary, structural-functional, supramolecular complex of sequential metabolic enzymes and cellular structural elements, in which metabolites are passed from one active site to another without complete equilibration with the bulk cellular fluids” (Srere, 1985, 1987). This substrate channeling should decrease transit tim...
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It has been proposed that enzymes can associate into complexes (metabolons) that increase the efficiency of metabolic pathways by channelling substrates between enzymes. Metabolons may increase flux by increasing the local concentration of intermediates, decreasing the concentration of enzymes needed to maintain a given flux, directing the products of a pathway to a specific subcellular locatio...
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the cell sap where it can be reduced in the presence of the appropriate enzyme and reduced pyridine nucleotide. Boxer and Devlin (3) have suggested that this indirect mechanism is not available to malignant cells. In accordance with the sugges tion of Weinhouse (27), they believe that the high rate of aerobic lactate production by malignant celLs is a consequence of the absence of an effective ...
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A comparative study of the transport of pyruvate in mitochondria isolated from normal rat liver and from three tumors has been carried out. The Km for net pyruvate uptake in mitochondria isolated from Ehrlich ascites tumor cells is practically equal to that measured in normal rat liver mitochondria while, on the other hand, it is higher in Morris hepatomas 44 and 3924A. The Vmax of pyruvate upt...
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Multidrug resistance (MDR) driven by ABC (ATP binding cassette) membrane transporters is one of the major causes of treatment failure in human malignancy. MDR capacity is thought to be unevenly distributed among tumor cells, with higher capacity residing in tumor-initiating cells (TIC) (though opposite finding are occasionally reported). Functional evidence for enhanced MDR of TICs was previous...
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ژورنال
عنوان ژورنال: Cancers
سال: 2020
ISSN: 2072-6694
DOI: 10.3390/cancers12040899