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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 2, Iss. 8 — Aug. 1, 2011
  • pp: 2307–2316

Optics InfoBase > Biomedical Optics Express > Volume 2 > Issue 8 > Page 2307

Structural changes in mixed Col I/Col V collagen gels probed by SHG microscopy: implications for probing stromal alterations in human breast cancer

Visar Ajeti, Oleg Nadiarnykh, Suzanne M. Ponik, Patricia J. Keely, Kevin W. Eliceiri, and Paul J. Campagnola  »View Author Affiliations


Biomedical Optics Express, Vol. 2, Issue 8, pp. 2307-2316 (2011)
http://dx.doi.org/10.1364/BOE.2.002307


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Abstract

Second Harmonic Generation (SHG) microscopy has been previously used to describe the morphology of collagen in the extracellular matrix (ECM) in different stages of invasion in breast cancer. Here this concept is extended by using SHG to provide quantitative discrimination of self-assembled collagen gels, consisting of mixtures of type I (Col I) and type V (Col V) isoforms which serve as models of changes in the ECM during invasion in vivo. To investigate if SHG is sensitive to changes due to Col V incorporation into Col I fibrils, gels were prepared with 0-20% Col V with the balance consisting of Col I. Using the metrics of SHG intensity, fiber length, emission directionality, and depth-dependent intensities, we found similar responses for gels comprised of 100% Col I, and 95% Col I/5% Col V, where these metrics were all significantly different from those of the 80% Col I/20% Col V gels. Specifically, the gels of lower Col V content produce brighter SHG, are characterized by longer fibers, and have a higher forward/backward emission ratio. These attributes are all consistent with more highly organized collagen fibrils/fibers and are in agreement with previous TEM characterization as well as predictions based on phase matching considerations. These results suggest that SHG can be developed to discriminate Col I/Col V composition in tissues to characterize and follow breast cancer invasion.

© 2011 OSA

OCIS Codes
(180.6900) Microscopy : Three-dimensional microscopy
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4180) Nonlinear optics : Multiphoton processes
(290.7050) Scattering : Turbid media
(170.6935) Medical optics and biotechnology : Tissue characterization

ToC Category:
Microscopy

History
Original Manuscript: May 31, 2011
Revised Manuscript: July 12, 2011
Manuscript Accepted: July 14, 2011
Published: July 20, 2011

Citation
Visar Ajeti, Oleg Nadiarnykh, Suzanne M. Ponik, Patricia J. Keely, Kevin W. Eliceiri, and Paul J. Campagnola, "Structural changes in mixed Col I/Col V collagen gels probed by SHG microscopy: implications for probing stromal alterations in human breast cancer," Biomed. Opt. Express 2, 2307-2316 (2011)
http://www.opticsinfobase.org/boe/abstract.cfm?URI=boe-2-8-2307


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