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Single‐cell heterogeneity in suppression of PC12 differentiation by direct microinjection of a differentiation inhibitor, U0126
Author(s) -
Chung Jihye,
Miura Natsuko,
Ito Akio,
Sawada Munetaka,
Nishikawa Shigemichi,
Kuroda Kouichi,
Ueda Mitsuyoshi
Publication year - 2014
Publication title -
cell biology international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.932
H-Index - 77
eISSN - 1095-8355
pISSN - 1065-6995
DOI - 10.1002/cbin.10296
Subject(s) - neurite , cell , microinjection , microbiology and biotechnology , cell culture , population , cell growth , cellular differentiation , protein kinase a , chemistry , kinase , biology , in vitro , biochemistry , genetics , medicine , environmental health , gene
Phenotypic and genomic heterogeneity among single cells in a cell population leads to inaccuracy and obscuration in research about mammalian cell differentiation. In order to address the problems regarding bulk analysis on heterogeneous cell populations, it is necessary to accurately regulate and analyze changes in differentiating cells at the single‐cell level. To investigate the single‐cell changes in PC12 neuronal differentiation that occur when inhibited by U0126, an inhibitor of mitogen‐activated protein kinase kinase (MEK), we directly injected the chemical into individual target cells and analyzed the outcomes (neurite outgrowth) at the single‐cell level. As a result, we could accurately regulate the quantity of U0126 being introduced into each target cell, which was previously not possible using the common method of simply adding the inhibitor to the culture medium. It was possible to analyze the inhibitive effect of U0126 even when the injected quantity was lower than the lower limit for inhibition when added to culture medium (0.1 μM, identical to 1.2 × 10 8 molecules per cell on dish). In particular, injection of 1.5 × 10 7 molecules into each cell resulted in a 59% decrease of the mean total neurite length. Time‐course analysis of neurite outgrowth at the single‐cell level using fluorescence staining method showed that the changes in neurite length of differentiating PC12 cells were not homogeneous, but were largely variable across individual target cells.