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标题：Detection of phosphorylated Akt and MAPK in cell culture assays
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作者：Simon Molgaard ; Maj Ulrichsen ; Ditte Olsen 等
期刊名称：MethodsX
印刷版ISSN：2215-0161
电子版ISSN：2215-0161
出版年度：2016
卷号：3
页码：386-398
DOI：10.1016/j.mex.2016.04.009
语种：English
出版社：Elsevier
摘要：Graphical abstract Activation of intracellular kinases upon BDNF-stimulation of cultured hippocampal neurons A. Non-stimulated negative control. B. BDNF-stimulation of hippocampal neurons induces phosphorylation of Akt, and specific antibodies against such allows for visualization of phosphorylated Akt (pAkt) on a subcellular level. Here only shown for pAkt, however, the paper also discuss visualization of phosphorylated MAPK. Display Omitted Abstract This article describes an immunocytochemistry (ICC) method for staining against phosphorylated forms of the kinases Akt (pAkt) and MAPK (pMAPK). Phosphorylation is induced upon their activation by a number stimuli including insulin and brain-derived neurotrophic factor (BDNF), and is prerequisite for a number of cellular processes including cell proliferation and survival . ICC using antibodies raised against specific phosphorylation sites allows cell-type specific and subcellular monitoring of kinase activation. Here, we test how four different antibodies against pAkt and pMAPK, respectively perform in different cell types following insulin or BDNF stimulation using different protocol conditions. We find that phospho-specific-antibodies generally perform better when using Triton X-100 as a permeabilization agent compared to Saponin. In addition, two antibodies against pAkt and two against pMAPK gave a clear increase in signal in cells stimulated with insulin or BDNF compared to the signal obtained in unstimulated cells. These antibodies also performed well when tested with western blotting. Our results illustrate that both the choice of antibody as well as protocol details are critical parameters for successful detection of phosphorylated forms of kinases by ICC. This article includes: • A protocol for subcellular detection of phosphorylated Akt and MAPK. • Validation of 8 antibodies by immunocytochemistry. • Confirmation by western blotting
关键词：HEK 293 cells;Hippocampal neuron culture;Fluorescence;Confocal microscopy;Signalling;BDNF;Insulin