Genetic and Drug Inhibition of LDH-A: Effects on Murine Gliomas.
Genetic and Drug Inhibition of LDH-A: Effects on Murine Gliomas.
复制标题
LDH-A 的遗传和药物抑制：对小鼠神经胶质瘤的影响。
DOI：
10.3390/cancers14092306
复制
发表时间：
2022-05-06
期刊：
影响因子：
5.2
通讯作者：
Blasberg, Ronald
中科院分区：
文献类型：
--
作者：
Maeda, Masatomo;Ko, Myat;Mane, Mayuresh M.;Cohen, Ivan J.;Shindo, Masahiro;Vemuri, Kiranmayi;Serganova, Inna;Blasberg, Ronald
关键词：
Three different murine glioma cell lines were modified to downregulate expression of the murine LDH-A gene using shRNA knockdown (KD) and compared to pharmacologic (GNE-R-140) inhibition of the LDH enzyme complex, and to shRNA scrambled control (NC) cell lines. The effects of shRNA LDH-A knockdown and LDH drug-targeted inhibition (GNE-R-140) on tumor-cell metabolism, tumor growth, and animal survival were similar in each of the cell lines. However, an unexpected increase in the aggressiveness was observed in LDH-A KD and GNE-R-140 treated GL261 intracranial gliomas, but not in CT2A and ALTS1C1 i.c. gliomas. Our results show that LDH-A KD and GNE-R-140 treated GL261 cells are better able to metabolize lactate as a primary carbon source through the TCA cycle, and are a net consumer of lactate. These results suggest that inhibition of LDH-A/glycolysis may not be a general strategy to inhibit the i.c. growth of all gliomas, and that metabolic-inhibition treatment strategies need to be carefully assessed, since the inhibition of glycolysis may lead to the unexpected development and activation of alternative metabolic pathways resulting in enhanced tumor-cell survival in a nutrient-limited environment, leading to increased tumor aggressiveness. The effects of the LDH-A depletion via shRNA knockdown on three murine glioma cell lines and corresponding intracranial (i.c.) tumors were studied and compared to pharmacologic (GNE-R-140) inhibition of the LDH enzyme complex, and to shRNA scrambled control (NC) cell lines. The effects of genetic-shRNA LDH-A knockdown and LDH drug-targeted inhibition (GNE-R-140) on tumor-cell metabolism, tumor growth, and animal survival were similar. LDH-A KD and GNE-R-140 unexpectedly increased the aggressiveness of GL261 intracranial gliomas, but not CT2A and ALTS1C1 i.c. gliomas. Furthermore, the bioenergetic profiles (ECAR and OCR) of GL261 NC and LDH-A KD cells under different nutrient limitations showed that (a) exogenous pyruvate is not a major carbon source for metabolism through the TCA cycle of native GL261 cells; and (b) the unique upregulation of LDH-B that occurs in GL261 LDH-A KD cells results in these cells being better able to: (i) metabolize lactate as a primary carbon source through the TCA cycle, (ii) be a net consumer of lactate, and (iii) showed a significant increase in the proliferation rate following the addition of 10 mM lactate to the glucose-free media (only seen in GL261 KD cells). Our study suggests that inhibition of LDH-A/glycolysis may not be a general strategy to inhibit the i.c. growth of all gliomas, since the level of LDH-A expression and its interplay with LDH-B can lead to complex metabolic interactions between tumor cells and their environment. Metabolic-inhibition treatment strategies need to be carefully assessed, since the inhibition of glycolysis (e.g., inhibition of LDH-A) may lead to the unexpected development and activation of alternative metabolic pathways (e.g., upregulation of lipid metabolism and fatty-acid oxidation pathways), resulting in enhanced tumor-cell survival in a nutrient-limited environment and leading to increased tumor aggressiveness.
登录
查看更多内容
HIF-1Alpha稳定和降解的实时成像。
影响因子：
3.7
作者：
Moroz E;Carlin S;Dyomina K;Burke S;Thaler HT;Blasberg R;Serganova I
通讯作者：
Serganova I
影响因子：
14.8
作者：
Chen YJ;Mahieu NG;Huang X;Singh M;Crawford PA;Johnson SL;Gross RW;Schaefer J;Patti GJ
通讯作者：
Patti GJ
影响因子：
8
作者：
Leiblich, A.;Cross, S. S.;Rehman, I.
通讯作者：
Rehman, I.
影响因子：
1.9
作者：
Branco, Mariana;Linhares, Paulo;Vaz, Rui
通讯作者：
Vaz, Rui
影响因子：
64.5
作者：
Faubert B;Li KY;Cai L;Hensley CT;Kim J;Zacharias LG;Yang C;Do QN;Doucette S;Burguete D;Li H;Huet G;Yuan Q;Wigal T;Butt Y;Ni M;Torrealba J;Oliver D;Lenkinski RE;Malloy CR;Wachsmann JW;Young JD;Kernstine K;DeBerardinis RJ
通讯作者：
DeBerardinis RJ