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O'Dwyer K, Mouras R, Mani AA, Rice D, Gleeson M, Liu N, Tofail SAM, Silien C. Label-free multimodal coherent anti-Stokes Raman scattering analysis of microparticles in unconstrained microfluidics. APPLIED OPTICS 2018; 57:E32-E36. [PMID: 30117918 DOI: 10.1364/ao.57.000e32] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 05/15/2018] [Indexed: 06/08/2023]
Abstract
Fast, label-free optical identification and quantification of biomolecules and other relevant biological materials in microfluidic devices and the vascular system will play a major role in liquid biopsy and related diagnoses. An optical microscope probing simultaneously non-linear coherent anti-Stokes Raman scattering (CARS) and linear scattering (LS) was used to probe microparticles in aqueous solutions flowed unconstrained in microfluidic channels. Despite the optical complexity of these systems, where out-of-focus microparticles randomly impede CARS and LS, and where water CARS generates a substantial background, we demonstrate that in-focus microparticles can be individually and unambiguously detected when CARS and LS are co-analyzed. The ability to chemically discriminate microscale features in optically realistic flows supports the relevance of multimodal CARS platforms for liquid biopsy.
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Bailey KA, Klymenko Y, Feist PE, Hummon AB, Stack MS, Schultz ZD. Chemical Analysis of Morphological Changes in Lysophosphatidic Acid-Treated Ovarian Cancer Cells. Sci Rep 2017; 7:15295. [PMID: 29127342 PMCID: PMC5681516 DOI: 10.1038/s41598-017-15547-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 10/30/2017] [Indexed: 12/21/2022] Open
Abstract
Ovarian cancer (OvCa) cells are reported to undergo biochemical changes at the cell surface in response to treatment with lysophosphatidic acid (LPA). Here we use scanning electron microscopy (SEM) and multiplex coherent anti-Stokes Raman scattering (CARS) imaging via supercontinuum excitation to probe morphological changes that result from LPA treatment. SEM images show distinct shedding of microvilli-like features upon treatment with LPA. Analysis of multiplex CARS images can distinguish between molecular components, such as lipids and proteins. Our results indicate that OvCa429 and SKOV3ip epithelial ovarian cancer cells undergo similar morphological and chemical responses to treatment with LPA. The microvilli-like structures on the surface of multicellular aggregates (MCAs) are removed by treatment with LPA. The CARS analysis shows a distinct decrease in protein and increase in lipid composition on the surface of LPA-treated cells. Importantly, the CARS signals from cellular sheddings from MCAs with LPA treatment are consistent with cleavage of proteins originally present. Mass spectrometry on the cellular sheddings show that a large number of proteins, both membrane and intracellular, are present. An increased number of peptides are detected for the mesenchymal cell line relative to the epithelial cell indicating a differential response to LPA treatment with cancer progression.
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Affiliation(s)
- Karen A Bailey
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Yuliya Klymenko
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, 46556, USA
- Harper Cancer Research Institute, University of Notre Dame, South Bend, IN, 46617, USA
| | - Peter E Feist
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Amanda B Hummon
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, 46556, USA
- Harper Cancer Research Institute, University of Notre Dame, South Bend, IN, 46617, USA
| | - M Sharon Stack
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, 46556, USA
- Harper Cancer Research Institute, University of Notre Dame, South Bend, IN, 46617, USA
| | - Zachary D Schultz
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, 46556, USA.
- Harper Cancer Research Institute, University of Notre Dame, South Bend, IN, 46617, USA.
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