The P2X7 receptor is a key modulator of aerobic glycolysis.

The P2X7 receptor is a key modulator of aerobic glycolysis.
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DOI:
10.1038/cddis.2012.105
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发表时间:
2012-08-16
影响因子:
9
通讯作者:
--
中科院分区:
生物学1区
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--
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适应营养供应有限的条件的能力需要重组代谢途径,以平衡能量产生和生物合成中间体的生产。一些快速生长的细胞过度表达细胞外 ATP 的 P2X7 受体 (P2X7R)。该受体的一个特征是允许在没有血清的情况下生长。我们在此表明​​,P2X7R 的转染不仅可以在无血清的情况下,而且可以在低 (4 mM) 葡萄糖的情况下使 P2X7R 转染的 HEK293 (HEK293-P2X7) 细胞增殖,并且与模拟转染的 HEK293 (HEK293-mock) 细胞相比,乳酸输出增加。在 HEK293-P2X7 中,添加外源 ATP 或线粒体解偶联剂羰基氰化物对三氟甲氧基苯腙 (FCCP) 会进一步刺激乳酸输出。在人神经母细胞瘤细胞系 ACN 中,乳酸输出也依赖于 P2X7R 功能。 P2X7R 表达细胞上调 (a) 葡萄糖转运蛋白 Glut1、(b) 糖酵解酶甘油醛 3-磷酸脱氢酶 (G3PDH)、(c) 磷酸果糖激酶 (PFK)、(d) 丙酮酸激酶 M2 (PKM2) 和 (e) 丙酮酸脱氢酶激酶 1 (PDHK1);此外,P2X7R 表达 (a) 抑制丙酮酸脱氢酶 (PDH) 活性,(b) 增加磷酸化 Akt/PKB 和缺氧诱导因子 1α (HIF-1α) 表达,(c) 增强细胞内糖原储存。在 HEK293-P2X7 细胞中,葡萄糖剥夺会增加乳酸的产生、糖酵解酶的表达和 ph-Akt/PKB 水平。这些数据表明,P2X7R 具有重新编程细胞代谢以满足不利环境条件的需求的内在能力。
Ability to adapt to conditions of limited nutrient supply requires a reorganization of the metabolic pathways to balance energy generation and production of biosynthetic intermediates. Several fast-growing cells overexpress the P2X7 receptor (P2X7R) for extracellular ATP. A feature of this receptor is to allow growth in the absence of serum. We show here that transfection of P2X7R allows proliferation of P2X7R-transfected HEK293 (HEK293-P2X7) cells not only in the absence of serum but also in low (4 mM) glucose, and increases lactate output compared with mock-transfected HEK293 (HEK293-mock) cells. In HEK293-P2X7, lactate output is further stimulated upon addition of exogenous ATP or the mitochondrial uncoupler carbonylcyanide p-trifluoromethoxyphenylhydrazone (FCCP). In the human neuroblastoma cell line ACN, lactate output is also dependent on P2X7R function. P2X7R-expressing cells upregulate (a) the glucose transporter Glut1, (b) the glycolytic enzymes glyceraldehyde 3-phosphate dehydrogenase (G3PDH), (c) phosphofructokinase (PFK), (d) pyruvate kinase M2 (PKM2) and (e) pyruvate dehydrogenase kinase 1 (PDHK1); furthermore, P2X7R expression (a) inhibits pyruvate dehydrogenase (PDH) activity, (b) increases phosphorylated Akt/PKB and hypoxia-inducible factor 1α (HIF-1α) expression and (c) enhances intracellular glycogen stores. In HEK293-P2X7 cells, glucose deprivation increases lactate production, expression of glycolytic enzymes and ph-Akt/PKB level. These data show that the P2X7R has an intrinsic ability to reprogram cell metabolism to meet the needs imposed by adverse environmental conditions.
DOI: 10.1016/s0065-230x(09)02002-8
发表时间: 2009
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发表时间: 2010-09-01
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影响因子: 4.8
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影响因子: 4.4
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