Extracellular vesicles from regenerative human cardiac cells act as potent immune modulators by priming monocytes
Abstract Background Nano-sized vesicles, so called extracellular vesicles (EVs), from regenerative cardiac cells represent a promising new therapeutic approach to treat cardiovascular diseases. However, it is not yet sufficiently understood how cardiac-derived EVs facilitate their protective effects...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2019-05-01
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| Series: | Journal of Nanobiotechnology |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s12951-019-0504-0 |
| _version_ | 1811304476432138240 |
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| author | Christien M. Beez Marion Haag Oliver Klein Sophie Van Linthout Michael Sittinger Martina Seifert |
| author_facet | Christien M. Beez Marion Haag Oliver Klein Sophie Van Linthout Michael Sittinger Martina Seifert |
| author_sort | Christien M. Beez |
| collection | DOAJ |
| description | Abstract Background Nano-sized vesicles, so called extracellular vesicles (EVs), from regenerative cardiac cells represent a promising new therapeutic approach to treat cardiovascular diseases. However, it is not yet sufficiently understood how cardiac-derived EVs facilitate their protective effects. Therefore, we investigated the immune modulating capabilities of EVs from human cardiac-derived adherent proliferating (CardAP) cells, which are a unique cell type with proven cardioprotective features. Results Differential centrifugation was used to isolate EVs from conditioned medium of unstimulated or cytokine-stimulated (IFNγ, TNFα, IL-1β) CardAP cells. The derived EVs exhibited typical EV-enriched proteins, such as tetraspanins, and diameters mostly of exosomes (< 100 nm). The cytokine stimulation caused CardAP cells to release smaller EVs with a lower integrin ß1 surface expression, while the concentration between both CardAP-EV variants was unaffected. An exposure of either CardAP-EV variant to unstimulated human peripheral blood mononuclear cells (PBMCs) did not induce any T cell proliferation, which indicates a general low immunogenicity. In order to evaluate immune modulating properties, PBMC cultures were stimulated with either Phytohemagglutin or anti-CD3. The treatment of those PBMC cultures with either CardAP-EV variant led to a significant reduction of T cell proliferation, pro-inflammatory cytokine release (IFNγ, TNFα) and increased levels of active TGFβ. Further investigations identified CD14+ cells as major recipient cell subset of CardAP–EVs. This interaction caused a significant lower surface expression of HLA-DR, CD86, and increased expression levels of CD206 and PD-L1. Additionally, EV-primed CD14+ cells released significantly more IL-1RA. Notably, CardAP-EVs failed to modulate anti-CD3 triggered T cell proliferation and pro-inflammatory cytokine release in monocultures of purified CD3+ T cells. Subsequently, the immunosuppressive feature of CardAP-EVs was restored when anti-CD3 stimulated purified CD3+ T cells were co-cultured with EV-primed CD14+ cells. Beside attenuated T cell proliferation, those cultures also exhibited a significant increased proportion of regulatory T cells. Conclusions CardAP-EVs have useful characteristics that could contribute to enhanced regeneration in damaged cardiac tissue by limiting unwanted inflammatory processes. It was shown that the priming of CD14+ immune cells by CardAP-EVs towards a regulatory type is an essential step to attenuate significantly T cell proliferation and pro-inflammatory cytokine release in vitro. |
| first_indexed | 2024-04-13T08:07:50Z |
| format | Article |
| id | doaj.art-3dbf25925da74fcd858c045a8e071e92 |
| institution | Directory Open Access Journal |
| issn | 1477-3155 |
| language | English |
| last_indexed | 2024-04-13T08:07:50Z |
| publishDate | 2019-05-01 |
| publisher | BMC |
| record_format | Article |
| series | Journal of Nanobiotechnology |
| spelling | doaj.art-3dbf25925da74fcd858c045a8e071e922022-12-22T02:55:06ZengBMCJournal of Nanobiotechnology1477-31552019-05-0117111810.1186/s12951-019-0504-0Extracellular vesicles from regenerative human cardiac cells act as potent immune modulators by priming monocytesChristien M. Beez0Marion Haag1Oliver Klein2Sophie Van Linthout3Michael Sittinger4Martina Seifert5Charité-Universitätsmedizin Berlin, BCRT-Berlin, Institute Of Health Center for Regenerative TherapiesCharité-Universitätsmedizin Berlin, BCRT-Berlin, Institute Of Health Center for Regenerative TherapiesCharité-Universitätsmedizin Berlin, BCRT-Berlin, Institute Of Health Center for Regenerative TherapiesCharité-Universitätsmedizin Berlin, BCRT-Berlin, Institute Of Health Center for Regenerative TherapiesCharité-Universitätsmedizin Berlin, BCRT-Berlin, Institute Of Health Center for Regenerative TherapiesCharité-Universitätsmedizin Berlin, BCRT-Berlin, Institute Of Health Center for Regenerative TherapiesAbstract Background Nano-sized vesicles, so called extracellular vesicles (EVs), from regenerative cardiac cells represent a promising new therapeutic approach to treat cardiovascular diseases. However, it is not yet sufficiently understood how cardiac-derived EVs facilitate their protective effects. Therefore, we investigated the immune modulating capabilities of EVs from human cardiac-derived adherent proliferating (CardAP) cells, which are a unique cell type with proven cardioprotective features. Results Differential centrifugation was used to isolate EVs from conditioned medium of unstimulated or cytokine-stimulated (IFNγ, TNFα, IL-1β) CardAP cells. The derived EVs exhibited typical EV-enriched proteins, such as tetraspanins, and diameters mostly of exosomes (< 100 nm). The cytokine stimulation caused CardAP cells to release smaller EVs with a lower integrin ß1 surface expression, while the concentration between both CardAP-EV variants was unaffected. An exposure of either CardAP-EV variant to unstimulated human peripheral blood mononuclear cells (PBMCs) did not induce any T cell proliferation, which indicates a general low immunogenicity. In order to evaluate immune modulating properties, PBMC cultures were stimulated with either Phytohemagglutin or anti-CD3. The treatment of those PBMC cultures with either CardAP-EV variant led to a significant reduction of T cell proliferation, pro-inflammatory cytokine release (IFNγ, TNFα) and increased levels of active TGFβ. Further investigations identified CD14+ cells as major recipient cell subset of CardAP–EVs. This interaction caused a significant lower surface expression of HLA-DR, CD86, and increased expression levels of CD206 and PD-L1. Additionally, EV-primed CD14+ cells released significantly more IL-1RA. Notably, CardAP-EVs failed to modulate anti-CD3 triggered T cell proliferation and pro-inflammatory cytokine release in monocultures of purified CD3+ T cells. Subsequently, the immunosuppressive feature of CardAP-EVs was restored when anti-CD3 stimulated purified CD3+ T cells were co-cultured with EV-primed CD14+ cells. Beside attenuated T cell proliferation, those cultures also exhibited a significant increased proportion of regulatory T cells. Conclusions CardAP-EVs have useful characteristics that could contribute to enhanced regeneration in damaged cardiac tissue by limiting unwanted inflammatory processes. It was shown that the priming of CD14+ immune cells by CardAP-EVs towards a regulatory type is an essential step to attenuate significantly T cell proliferation and pro-inflammatory cytokine release in vitro.http://link.springer.com/article/10.1186/s12951-019-0504-0Extracellular vesiclesExosomesCardiac cellsImmunomodulationCD14+ myeloid suppressive cellsMonocytes |
| spellingShingle | Christien M. Beez Marion Haag Oliver Klein Sophie Van Linthout Michael Sittinger Martina Seifert Extracellular vesicles from regenerative human cardiac cells act as potent immune modulators by priming monocytes Journal of Nanobiotechnology Extracellular vesicles Exosomes Cardiac cells Immunomodulation CD14+ myeloid suppressive cells Monocytes |
| title | Extracellular vesicles from regenerative human cardiac cells act as potent immune modulators by priming monocytes |
| title_full | Extracellular vesicles from regenerative human cardiac cells act as potent immune modulators by priming monocytes |
| title_fullStr | Extracellular vesicles from regenerative human cardiac cells act as potent immune modulators by priming monocytes |
| title_full_unstemmed | Extracellular vesicles from regenerative human cardiac cells act as potent immune modulators by priming monocytes |
| title_short | Extracellular vesicles from regenerative human cardiac cells act as potent immune modulators by priming monocytes |
| title_sort | extracellular vesicles from regenerative human cardiac cells act as potent immune modulators by priming monocytes |
| topic | Extracellular vesicles Exosomes Cardiac cells Immunomodulation CD14+ myeloid suppressive cells Monocytes |
| url | http://link.springer.com/article/10.1186/s12951-019-0504-0 |
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