Hypoxia is a driving force in pancreatic cancer growth and metastasis. Since the muscle isoform of lactate dehydrogenase (LDH-A) constitutes a major checkpoint for the switch from aerobic to anaerobic glycolysis, we tested a series of novel N-hydroxy-2-carboxy-substituted indoles with Ki values for LDH-A reaching the low micromolar range. LDH-A expression was detected in all the pancreatic cancer cells, and significantly increased under hypoxic conditions. The novel LDH-A inhibitors demonstrated a good antiproliferative activity, with IC50 values ranging between 9.9 and 20.3 uM in normoxic conditions, and they proved to be particularly effective under hypoxic conditions, with 100- and 2-fold reduction of IC50s in PP78 and PANC-1 cells, respectively. Furthermore, these compounds induced apoptosis, and synergistically enhanced the cytotoxic activity of gemcitabine (CI values < 0.5). These data provide evidence that LDH-A is a viable target in pancreatic cancer cells, and novel LDH-A inhibitors display synergistic cytotoxic activity with gemcitabine, offering an innovative tool for optimizing chemotherapy in hypoxic pancreatic tumors.

Synergistic Interaction of Novel Lactate Dehydrogenase Inhibitors with Gemcitabine in Hypoxic Models of Pancreatic Cancer

GRANCHI, CARLOTTA;FUNEL, NICCOLA;MACCHIA, MARCO;MINUTOLO, FILIPPO;
2011-01-01

Abstract

Hypoxia is a driving force in pancreatic cancer growth and metastasis. Since the muscle isoform of lactate dehydrogenase (LDH-A) constitutes a major checkpoint for the switch from aerobic to anaerobic glycolysis, we tested a series of novel N-hydroxy-2-carboxy-substituted indoles with Ki values for LDH-A reaching the low micromolar range. LDH-A expression was detected in all the pancreatic cancer cells, and significantly increased under hypoxic conditions. The novel LDH-A inhibitors demonstrated a good antiproliferative activity, with IC50 values ranging between 9.9 and 20.3 uM in normoxic conditions, and they proved to be particularly effective under hypoxic conditions, with 100- and 2-fold reduction of IC50s in PP78 and PANC-1 cells, respectively. Furthermore, these compounds induced apoptosis, and synergistically enhanced the cytotoxic activity of gemcitabine (CI values < 0.5). These data provide evidence that LDH-A is a viable target in pancreatic cancer cells, and novel LDH-A inhibitors display synergistic cytotoxic activity with gemcitabine, offering an innovative tool for optimizing chemotherapy in hypoxic pancreatic tumors.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/193996
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