High-resolution Nonlinear Optical Imaging of Live Cells by Second Harmonic Generation

Overview

Journal Biophys J

Publisher Cell Press

Specialty Biophysics

Date 1999 Dec 10

PMID 10585956

Citations 90

Authors

P J Campagnola

M D Wei

A Lewis

L M Loew

Affiliations

Soon will be listed here.

Abstract

By adapting a laser scanning microscope with a titanium sapphire femtosecond pulsed laser and transmission optics, we are able to produce live cell images based on the nonlinear optical phenomenon of second harmonic generation (SHG). Second harmonic imaging (SHIM) is an ideal method for probing membranes of living cells because it offers the high resolution of nonlinear optical microscopy with the potential for near-total avoidance of photobleaching and phototoxicity. The technique has been implemented on three cell lines labeled with membrane-staining dyes that have large nonlinear optical coefficients. The images can be obtained within physiologically relevant time scales. Both achiral and chiral dyes were used to compare image formation for the case of single- and double-leaflet staining, and it was found that chirality plays a significant role in the mechanism of contrast generation. It is also shown that SHIM is highly sensitive to membrane potential, with a depolarization of 25 mV resulting in an approximately twofold loss of signal intensity.

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