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Antigen specific and nonspecific modulation of the immune response by aminolevulinic acid based photodynamic therapy
Abstract
Photosensitizers used normally in treating cancers have considerable potential for treatment of other diseases. One such photosensitizer is the endogenously synthesized photosensitizer protoporphyrin IX (PpIX). To better understand how protoporphyrin might be used in transplantation or in treating autoimmune diseases, information must be obtained on how the photosensitizer affects all immune cells. We used a combination of flow cytometry and in vitro activation assays (recall assays and mixed-lymphocyte reactions) to examine the effects of PpIX on the antigen specific component, lymphocytes and the non-antigen specific component, the macrophages/monocytes and dendritic cells of the immune system. Whereas, lymphocytes accumulate PpIX only when activated, both macrophages and dendritic cells accumulated PpIX immediately, without in vitro activation, as measured by flow cytometry. ALA-PDT (aminolevulenic acid-photodynamic therapy) treated adherent cells in the recall assay had a decreased capability to activate lymphocytes. By increasing the light dose in the recall assay, antigen primed lymphocytes were selectively eliminated from a population of cells. Stimulator cells in an MLR had a decreased stimulatory capacity following ALA-PDT treatment. Functional alterations are seen in both the antigen specific
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In antigen-presenting cells such as dendritic cells and macrophages, PpIX accumulation can occur regardless of cell activation.
“However, in antigen-presenting cells such as dendritic cells and macrophages, PpIX accumulation can occur regardless of cell activation [161,162].”
From 5-Aminolevulinic Acid as a Theranostic Agent for Tumor Fluorescence Imaging and Photodynamic Therapy (2023) · cites this paper as [161]
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Metadata
- Authors
- Hryhorenko, E. A., Oseroff, A. R., Morgan, J., & Rittenhouse-Diakun, K.
- Affiliations
- Roswell Park Comprehensive Cancer Center (US)
- ORCID
- Morgan, Janet
- Venue
- Immunopharmacology
- Publisher
- Elsevier BV
- Published
- 1998-11
- Volume
- 40
- Issue
- 3
- Pages
- 231-240
- ISSN
- 0162-3109 (ISSN-L)
- OpenAlex
- W2024119968
- Cited by
- 30
- References
- 35
- Citations by year
- 2023: 1 · 2022: 1 · 2018: 2 · 2016: 1 · 2013: 1 · 2012: 1
- FWCI
- 1.01
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Immunopharmacology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Cancer Institute (P30 CA16056, P01 CA55791, P01CA055791, P30CA016056)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Photodynamic Therapy Research Studies
- Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
- Life Sciences › Immunology and Microbiology › Immunology › Immunotoxicology and immune responses
- Keywords
- 5-aminolevulinic acid, photodynamic therapy, protoporphyrin IX, photosensitizers, immunomodulation, lymphocyte activation, macrophages, dendritic cells, mixed lymphocyte reaction, antigen-specific immune response, immunosuppression
- MeSH terms
- Aminolevulinic Acid, Dendritic Cells, HLA-D Antigens, Humans, Lymphocytes, Macrophages, Photochemotherapy, Protoporphyrins, Photosensitizing Agents
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