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Ceramide and Sphingosine-1-Phosphate/Sphingosine act as Photodynamic Therapy-Elicited Damage-Associated Molecular Patterns: Release from Cells and Impact on Tumor-Associated Macrophages | Abstract
ISSN: 2155-9872

Journal of Analytical & Bioanalytical Techniques
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Research Article

Ceramide and Sphingosine-1-Phosphate/Sphingosine act as Photodynamic Therapy-Elicited Damage-Associated Molecular Patterns: Release from Cells and Impact on Tumor-Associated Macrophages

Mladen Korbelik1*, Judit Banáth1, Wei Zhang1, Fred Wong1, Jacek Bielawski2 and Duska Separovic3

1British Columbia Cancer Agency, Vancouver BC, Canada

2Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, Carolina, USA

3Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, USA

*Corresponding Author:
Dr. Mladen Korbelik
B.C. Cancer Research Centre, 675 West 10th Avenue
Vancouver BC, V5Z 1L3 Canada
Tel: 604-675-8084
Fax: 604-675-8099
E-mail: [email protected]

Received date: June 18, 2014; Accepted date: July 29, 2014; Published date: July 31, 2014

Citation: Korbelik M, Banáth J, Zhang W, Wong F, Bielawski J, et al. (2014) Ceramide and Sphingosine-1-Phosphate/Sphingosine act as Photodynamic Therapy-Elicited Damage-Associated Molecular Patterns: Release from Cells and Impact on Tumor-Associated Macrophages. J Anal Bioanal Tech S1:009. doi: 10.4172/2155-9872.S1-009

Copyright: © 2014 Korbelik M, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

A recent finding showed that ceramide and sphingosine-1-phosphate (S1P) become exposed on the surface of cells treated by photodynamic therapy (PDT) and acquire the capacity to act as danger-associated molecular patterns (DAMPs). To explore this further, the present study examined whether ceramide and S1P can be released from PDTtreated cells and investigated changes in the levels of these sphingolipids in tumor-associated macrophages (TAMs) left in contact with PDT-treated tumor cells. Massspectroscopy-based analysis detected increased levels of C16- ceramide and dihydroC16-ceramide in media supernatants from SCCVII cells collected three hours after they were treated by PDT, compared to untreated cell supernatants. While no release of S1P was detected, elevated levels of its precursor sphingosine were found in the supernatants of PDT-treated cells. The co-incubation of TAMs-containing primary cultures derived from mouse SCCVII tumors with PDT-treated SCCVII cells was followed by ceramide and S1P analysis in these cells based on staining with specific antibodies and flow cytometry. Levels of both ceramide and S1P as well as inflammasome protein NLRP3 were found to rise in TAMs when they were co-cultured with PDT-treated SCCVII cells, while no significant change was seen with cancer cells. Such changes were induced also in TAMs incubated with supernatants from PDT-treated cells. The findings of the present study affirm the potential of sphingolipids including ceramide, S1P, and sphingosine to act, either exposed on cell surface or released in the microenvironment, as DAMPs in the response of tumors to PDT.

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Citations : 3732

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