
1.Department of Physics and Geology, University of Perugia, Perugia I-06123, Italy
2.Laboratory of Biochemistry and Molecular Biology, Department of Chemistry, Biology and Biotechnology, University of Perugia, via del Giochetto, Perugia I-06123, Italy
3.CEMIN-Center of Excellence for Innovative Nanostructured Material, Perugia I-06123, Italy
4.Istituto di Biofisica CNR (IBF-CNR), Unità di Trento, and FBK, Via Sommarive 18, Trento 38123, Italy
5.Istituto Officina dei Materiali del CNR (CNR-IOM)—Unità di Perugia, c/o Department of Physics and Geology, University of Perugia, Perugia I-06123, Italy
S Caponi, Email: silvia.caponi@cnr.it
Published:2018,
Published Online:09 February 2018,
Received:10 May 2017,
Revised:23 September 2017,
Accepted:08 October 2017
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Mattana, S. et al. Non-contact mechanical and chemical analysis of single living cells by microspectroscopic techniques. Light: Science & Applications, 1, 17139 (2018).
Mattana, S. et al. Non-contact mechanical and chemical analysis of single living cells by microspectroscopic techniques. Light: Science & Applications, 1, 17139 (2018). DOI: 10.1038/lsa.2017.139.
Innovative label-free microspectroscopy
which can simultaneously collect Brillouin and Raman signals
is used to characterize the viscoelastic properties and chemical composition of living cells with sub-micrometric resolution. The unprecedented statistical accuracy of the data combined with the high-frequency resolution and the high contrast of the recently built experimental setup permits the study of single living cells immersed in their buffer solution by contactless measurements. The Brillouin signal is deconvoluted in the buffer and the cell components
thereby revealing the mechanical heterogeneity inside the cell. In particular
a 20% increase is observed in the elastic modulus passing from the plasmatic membrane to the nucleus as distinguished by comparison with the Raman spectroscopic marker. Brillouin line shape analysis is even more relevant for the comparison of cells under physiological and pathological conditions. Following oncogene expression
cells show an overall reduction in the elastic modulus (15%) and apparent viscosity (50%). In a proof-of-principle experiment
the ability of this spectroscopic technique to characterize subcellular compartments and distinguish cell status was successfully tested. The results strongly support the future application of this technique for fundamental issues in the biomedical field.
living single cell analysismechanical propertiesRaman and Brillouin spectroscopy
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