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Biophysical Reviews

, Volume 11, Issue 3, pp 399–408 | Cite as

Optical second harmonic generation microscopy: application to the sensitive detection of cell membrane damage

  • Noritaka KatoEmail author
Review

Abstract

Optical second harmonic generation (SHG) is a nonlinear optical process which is sensitive to the symmetry of media. SHG microscopy allows for selective probing of a non-centrosymmetric area of sample. This type of nonlinear optical microscope was first used to observe ferroelectric domains and has been applied to various specimens including the biological samples to date. Imaging of the endogenous SHG of biological tissue has been utilized for the selective observation of filament systems in tissues such as collagen, myosin, and microtubules, which exhibit a polar structure. The cellular membrane can be selectively observed by the SHG microscope through membrane staining with amphiphilic polar dye molecules. It has been reported that, by imaging exogenous SHG of the membrane, sensitive detection of membrane damage could be realized using the SHG microscope. Because the staining dye is fluorescent, both SHG and two-photon excited fluorescence (TPF) images can be obtained simultaneously. How the SHG intensity depends on the molecular alignment of the polar dye molecules that reflects the ordering of lipid molecules in the plasma membrane and the necessity of the normalization of the SHG intensity by the TPF intensity is discussed. Furthermore, the assessment of the membrane damage induced by exposing polycation to HeLa cells has been compared with the conventional cytotoxicity and cell viability tests to demonstrate the higher sensitivity of the present SHG-based assay.

Keywords

Nonlinear optics SHG HeLa cell Cytotoxicity Assay Plasma membrane Lipid bilayer Molecular ordering 

Notes

Acknowledgements

The author acknowledges Associate Professor Y. Mukai for her support of the cell culture, Associate Professor H. Kudo for use of the microplate reader, and R. Kondo and H. Soga for their experimental assistance.

Compliance with ethical standards

Funding

This work was funded by The Institute of Science and Technology, Meiji University and JSPS KAKENHI Grant Number 16K01399.

Conflict of interest

Noritaka Kato declares that he has no conflict of interest.

Ethical approval

This article does not contain any studies with human participants and animals performed by the author.

Supplementary material

12551_2019_546_MOESM1_ESM.pdf (476 kb)
ESM 1 (PDF 476 kb)

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© International Union for Pure and Applied Biophysics (IUPAB) and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Electronics and BioinformaticsMeiji UniversityKawasakiJapan

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