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Immunolabeling for Correlative Light and Electron Microscopy on Ultrathin Cryosections

Published online by Cambridge University Press:  03 March 2008

Irawati K. Kandela ,
Reiner Bleher  and
Ralph M. Albrecht
Irawati K. Kandela
Affiliation:
Department of Pharmaceutical Sciences, University of Wisconsin, Madison, WI 53705, USA
Reiner Bleher
Affiliation:
Department of Animal Sciences, University of Wisconsin, Madison, WI 53706, USA
Ralph M. Albrecht
Affiliation:
Department of Pharmaceutical Sciences, University of Wisconsin, Madison, WI 53705, USA Department of Animal Sciences, University of Wisconsin, Madison, WI 53706, USA Department of Pediatrics, University of Wisconsin, Madison, WI 53706, USA
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Abstract

Correlative labeling permits colocalization of molecular species for observation of the same sample in light (LM) and electron microscopy (EM). Myosin bands in ultrathin cryosections were labeled using both fluorophore conjugated to secondary antibody (IgG) and colloidal gold (cAu) particles conjugated to primary IgG as reporters for LM and transmission electron microscopy (TEM), respectively. This technique allows rapid evaluation of labeling via LM, prior to more time-consuming observations with TEM and also yields two complementary data sets in one labeling procedure. Quenching of the fluorescent signal was inversely related to the distance between fluorophore and cAu particles. The signal from fluorophore conjugated to secondary antibody was inversely proportional to the size of cAu conjugated to primary antibody. Where fluorophore and cAu were bound to the same antibody, the fluorescence signal was nearly completely quenched regardless of fluorophore excitation or emission wavelength and regardless of particle size, 3 nm and larger. Colloidal metal particles conjugated to primary antibody provide high spatial resolution for EM applications. Fluorophore conjugated to secondary antibody provides spatial resolution well within that of conventional fluorescence microscopy. Use of fluorescent secondary antibody moved the fluorophore a sufficient distance from the cAu particles on the primary antibody to limit quenching of fluorescence.

Keywords

correlative labelingimmunofluorescenceimmuno-EMcolloidal gold particlesfluorophorescryosectionsnanoparticles
Type
Research Article
Information
Microscopy and Microanalysis , Volume 14 , Issue 2 , April 2008 , pp. 159 - 165
Copyright
© 2008 Microscopy Society of America

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