Purification and Characterization of β-Actin-Rich Tumor Cell Pseudopodia: Role of Glycolysis

Purification and Characterization of β-Actin-Rich Tumor Cell Pseudopodia: Role of Glycolysis
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富含 β-肌动蛋白的肿瘤细胞伪足的纯化和表征:糖酵解的作用

DOI:
10.1006/excr.2000.4929
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发表时间:
2000
影响因子:
3.7
通讯作者:
Ivan R. Nabi
Ivan R. Nabi
中科院分区:
医学3区
文献类型:
--
作者:
Trung N. Nguyen;Hui;S. Zalzal;Antonio Nanci;Ivan R. Nabi

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Abstract The MSV-MDCK-INV invasive variant of Moloney sarcoma virus ( mos ) transformed MDCK cells express multiple β-actin-rich pseudopodia (P. U. Le et al., Cancer Res. 58, 1631–1635, 1998). We show here that the tips of these actively protruding cellular domains are morphologically distinct presenting numerous blebs and selectively pass through 1-μm-pore filters. The pseudopodia were purified from the underside of the filters and a major protein component was identified as the glycolytic enzyme, glyceraldehyde-3-phosphate dehydrogenase (GAPDH). By confocal microscopy, GAPDH colocalized with actin in MSV-MDCK-INV pseudopodia localizing this glycolytic enzyme to this site of active actin polymerization. Inhibition of glycolysis with 2-deoxyglucose or oxamate induced a rapid transformation of β-actin-rich pseudopodia into extended lamellipodia and prevented cell motility. A localized glycolytic supply of energy therefore regulates the formation of β-actin-rich pseudopodial protrusions and thereby the motility of invasive tumor cells.
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