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The role of translation elongation factor eEF1A in intracellular alkalinization-induced tumor cell growth

Authors
 Juno Kim  ;  Wan Namkung  ;  Jae Seok Yoon  ;  Min Jae Jo  ;  Sung Hee Lee  ;  Kyung Hwan Kim  ;  Joo Young Kim  ;  Min Goo Lee 
Citation
 LABORATORY INVESTIGATION, Vol.89(8) : 867-874, 2009 
Journal Title
 LABORATORY INVESTIGATION 
ISSN
 0023-6837 
Issue Date
2009
MeSH
Acid-Base Equilibrium/physiology* ; Animals ; Carbon Dioxide/pharmacology* ; Cell Survival/drug effects ; Female ; Gene Expression Regulation, Neoplastic ; HeLa Cells ; Humans ; Hydrogen-Ion Concentration ; Mice ; NIH 3T3 Cells ; Peptide Elongation Factor 1/genetics ; Peptide Elongation Factor 1/metabolism* ; RNA, Messenger/metabolism ; Uterine Cervical Neoplasms/drug therapy ; Uterine Cervical Neoplasms/metabolism ; Uterine Cervical Neoplasms/pathology*
Abstract
The formation of a pH gradient, which is characterized by intracellular alkalinization and extracellular acidification, plays a key role in the growth and metastasis of tumor cells. However, the underlying mechanisms of alkalinization-induced cell growth are not known. In this study, we investigated the roles of eukaryotic translation elongation factor 1 alpha (eEF1A) in alkalinization-induced cell growth. In all cell lines tested (NIH3T3, HEK293, and HeLa), cell growth was affected by the modulation of intracellular pH. In general, weak intracellular alkalinization produced increased cell growth, whereas intracellular acidification resulted in decreased cell growth. It is interesting to note that portions of actin-bound eEF1A proteins were gradually reduced from acidic to alkaline conditions, suggesting an increase in levels of functionally active, free-form eEF1A. Over-expression of eEF1A caused increased cell growth in HeLa cells. It should be noted that dissociation of eEF1A from actin by transfection with the actin-binding domain deleted eEF1A construct further increased cell growth under acidic conditions, whereas most of the intact eEF1A was bound to actin. Conversely, knockdown of eEF1A by treatment with eEF1A1 and eEF1A2 siRNAs nullified the effects of alkalinization-induced cell growth. The above findings suggest that an increase in free-form eEF1A under alkaline conditions plays a critical role in alkalinization-induced cell growth.
Files in This Item:
T200902852.pdf Download
DOI
10.1038/labinvest.2009.53
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Pharmacology (약리학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kyung Hwan(김경환)
Kim, Joo Young(김주영) ORCID logo https://orcid.org/0000-0003-2623-1491
Lee, Min Goo(이민구) ORCID logo https://orcid.org/0000-0001-7436-012X
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/104448
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