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Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Cell+Chem+Biol 2016 ; 23 (11): 1417-27 Nephropedia Template TP
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Multicolor electron microscopy for simultaneous visualization of multiple molecular species #MMPMID27818300
Cell Chem Biol 2016[Nov]; 23 (11): 1417-27 PMID27818300show ga
Electron microscopy (EM) remains the primary method for imaging cellular and tissue ultrastructure, although simultaneous localization of multiple specific molecules continues to be a challenge for EM. We present a method for obtaining multicolor EM views of multiple subcellular components. The method uses sequential, localized deposition of different lanthanides by photosensitizers, small molecule probes or peroxidases. Detailed view of biological structures is created by overlaying conventional electron micrographs with pseudocolor lanthanide elemental maps derived from distinctive electron energy-loss spectra (EELS) of each lanthanide deposit via energy-filtered transmission electron microscopy (EFTEM). This results in multicolor EM images analogous to multicolor fluorescence but with the benefit of the full spatial resolution of EM. We illustrate the power of this methodology by visualizing hippocampal astrocytes to show that processes from two astrocytes can share a single synapse. We also show that polyarginine-based cell-penetrating peptides enter the cell via endocytosis, and that newly synthesized PKM? in cultured neurons preferentially localize to the post-synaptic membrane.