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In many different tumor types lactate dehydrogenase A is found at elevated levels and has even been linked to poor prognosis and a greater metastatic potential [24] The high levels of lactate production surface the question of whether lactate has some influence on the aggressive behaviour shown in hypoxic tumors.
Reaction catalyzed by lactate dehydrogenase. Lactate dehydrogenase catalyzes the interconversion of pyruvate and lactate with concomitant interconversion of NADH and NAD +.It converts pyruvate, the final product of glycolysis, to lactate when oxygen is absent or in short supply, and it performs the reverse reaction during the Cori cycle in the liver.
Elevated lactate dehydrogenase level were also associated with poorer outcomes. [81] Use of tobacco is associated with a person having a poorer prognosis, [ 11 ] and people who are married and live together have a better prognosis. [ 11 ]
Abnormal laboratory findings include elevation in blood lactate dehydrogenase levels in 50–80% of cases, progressively worsening anemia (i.e. decreases in red blood cells), thrombocytopenia (i.e. decreases in blood platelets), [1] and/or hypercalcemia (i.e. elevation in serum calcium levels often due to bone involvement). [6]
Glycolysis breaks down glucose into pyruvate, which is then fermented to lactate; pyruvate flux through TCA cycle is down-regulated in cancer cells. Pathways branching off of glycolysis, such as the pentose phosphate pathway, generate biochemical building blocks to sustain the high proliferative rate of cancer cells.
Lactate dehydrogenase A catalyzes the inter-conversion of pyruvate and L-lactate with concomitant inter-conversion of NADH and NAD +. LDHA is found in most somatic tissues, though predominantly in muscle tissue and tumors, and belongs to the lactate dehydrogenase family. It has long been known that many human cancers have higher LDHA levels ...
In cancer cells, major changes in gene expression increase glucose uptake to support their rapid growth. Unlike normal cells, which produce lactate only when oxygen is low, cancer cells convert much of the glucose to lactate even in the presence of adequate oxygen. This is known as the “Warburg Effect.”
In the absence of hypoxic conditions (i.e. physiological levels of oxygen), cancer cells preferentially convert glucose to lactate, according to Otto H. Warburg, who believed that aerobic glycolysis was the key metabolic change in cancer cell malignancy.
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