Structural Changes in Mixed Col I/Col V Collagen Gels Probed by SHG Microscopy: Implications for Probing Stromal Alterations in Human Breast Cancer

Overview

Journal Biomed Opt Express

Specialty Radiology

Date 2011 Aug 12

PMID 21833367

Citations 44

Authors

Visar Ajeti

Oleg Nadiarnykh

Suzanne M Ponik

Patricia J Keely

Kevin W Eliceiri

Paul J Campagnola

Affiliations

Soon will be listed here.

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.

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