Cell-Cell Contact Preserves Cell Viability via Plakoglobin

被引:25
作者
Wei, Qi [1 ]
Hariharan, Venkatesh [1 ]
Huang, Hayden [1 ]
机构
[1] Columbia Univ, Dept Biomed Engn, New York, NY 10027 USA
来源
PLOS ONE | 2011年 / 6卷 / 10期
基金
美国国家卫生研究院; 美国国家科学基金会;
关键词
GAMMA-CATENIN EXPRESSION; BETA-CATENIN; E-CADHERIN; IN-VITRO; ADHESION; DIFFERENTIATION; CARCINOMA; CANCER; GROWTH; PHOSPHORYLATION;
D O I
10.1371/journal.pone.0027064
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Control over cell viability is a fundamental property underlying numerous physiological processes. Cell spreading on a substrate was previously demonstrated to be a major factor in determining the viability of individual cells. In multicellular organisms, cell-cell contact is likely to play a significant role in regulating cell vitality, but its function is easily masked by cell-substrate interactions, thus remains incompletely characterized. In this study, we show that suspended immortalized human keratinocyte sheets with persisting intercellular contacts exhibited significant contraction, junctional actin localization, and reinforcement of cell-cell adhesion strength. Further, cells within these sheets remain viable, in contrast to trypsinized cells suspended without either cell-cell or cell-substrate contact, which underwent apoptosis at high rates. Suppression of plakoglobin weakened cell-cell adhesion in cell sheets and suppressed apoptosis in suspended, trypsinized cells. These results demonstrate that cell-cell contact may be a fundamental control mechanism governing cell viability and that the junctional protein plakoglobin is a key regulator of this process. Given the near-ubiquity of plakoglobin in multicellular organisms, these findings could have significant implications for understanding cell adhesion, modeling disease progression, developing therapeutics and improving the viability of tissue engineering protocols.
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页数:9
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