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Schineis P, Kotkowska ZK, Vogel-Kindgen S, Friess MC, Theisen M, Schwyter D, Hausammann L, Subedi S, Varypataki EM, Waeckerle-Men Y, Kolm I, Kündig TM, Høgset A, Gander B, Halin C, Johansen P. Photochemical internalization (PCI)-mediated activation of CD8 T cells involves antigen uptake and CCR7-mediated transport by migratory dendritic cells to draining lymph nodes. J Control Release 2021; 332:96-108. [PMID: 33609623 DOI: 10.1016/j.jconrel.2021.02.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Revised: 01/22/2021] [Accepted: 02/10/2021] [Indexed: 12/11/2022]
Abstract
Antigen cross-presentation to cytotoxic CD8+ T cells is crucial for the induction of anti-tumor and anti-viral immune responses. Recently, co-encapsulation of photosensitizers and antigens into microspheres and subsequent photochemical internalization (PCI) of antigens in antigen presenting cells has emerged as a promising new strategy for inducing antigen-specific CD8+ T cell responses in vitro and in vivo. However, the exact cellular mechanisms have hardly been investigated in vivo, i.e., which cell types take up antigen-loaded microspheres at the site of injection, or in which secondary lymphoid organ does T cell priming occur? We used spray-dried poly(lactic-co-glycolic acid) (PLGA) microspheres loaded with ovalbumin and the photosensitizer tetraphenyl chlorine disulfonate (TPCS2a) to investigate these processes in vivo. Intravital microscopy and flow cytometric analysis of the murine ear skin revealed that dendritic cells (DCs) take up PLGA microspheres in peripheral tissues. Illumination then caused photoactivation of TPCS2a and induced local tissue inflammation that enhanced CCR7-dependent migration of microsphere-containing DCs to tissue-draining lymph nodes (LNs), i.e., the site of CD8+ T cell priming. The results contribute to a better understanding of the functional mechanism of PCI-mediated vaccination and highlight the importance of an active transport of vaccine microspheres by antigen presenting cells to draining LNs.
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Affiliation(s)
- Philipp Schineis
- Institute of Pharmaceutical Sciences, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093 Zurich, Switzerland
| | - Zuzanna K Kotkowska
- Institute of Pharmaceutical Sciences, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093 Zurich, Switzerland; Department of Dermatology, University of Zurich, Gloriastrasse 31, 8091 Zurich, Switzerland
| | - Sarah Vogel-Kindgen
- Institute of Pharmaceutical Sciences, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093 Zurich, Switzerland
| | - Mona C Friess
- Institute of Pharmaceutical Sciences, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093 Zurich, Switzerland
| | - Martine Theisen
- Institute of Pharmaceutical Sciences, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093 Zurich, Switzerland
| | - David Schwyter
- Institute of Pharmaceutical Sciences, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093 Zurich, Switzerland
| | - Lucy Hausammann
- Institute of Pharmaceutical Sciences, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093 Zurich, Switzerland
| | - Saurav Subedi
- Institute of Pharmaceutical Sciences, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093 Zurich, Switzerland
| | - Eleni M Varypataki
- Department of Dermatology, University of Zurich, Gloriastrasse 31, 8091 Zurich, Switzerland
| | - Ying Waeckerle-Men
- Department of Dermatology, University of Zurich, Gloriastrasse 31, 8091 Zurich, Switzerland
| | - Isabel Kolm
- Department of Dermatology, University Hospital Zurich, Gloriastrasse 31, 8091 Zurich, Switzerland
| | - Thomas M Kündig
- Department of Dermatology, University of Zurich, Gloriastrasse 31, 8091 Zurich, Switzerland; Department of Dermatology, University Hospital Zurich, Gloriastrasse 31, 8091 Zurich, Switzerland
| | - Anders Høgset
- PCI Biotech AS, Ullernchauséen 64, 0379 Oslo, Norway
| | - Bruno Gander
- Institute of Pharmaceutical Sciences, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093 Zurich, Switzerland
| | - Cornelia Halin
- Institute of Pharmaceutical Sciences, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093 Zurich, Switzerland.
| | - Pål Johansen
- Department of Dermatology, University of Zurich, Gloriastrasse 31, 8091 Zurich, Switzerland; Department of Dermatology, University Hospital Zurich, Gloriastrasse 31, 8091 Zurich, Switzerland.
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Abstract
Homogeneous preparations of actin cleaved into two fragments, the N-terminal 9- and C-terminal 36-kDa peptides, were achieved by proteolysis of G-actin with subtilisin at 23 degrees C at a 1:1000 (w/w) ratio of enzyme to actin. The subtilisin cleavage site was identified by sequence analysis to be between Met-47 and Gly-48. Although under nondenaturing conditions the two fragments remained associated to one another, the cleavage affected macromolecular interactions of actin. The rates of cleaved actin polymerization by MgCl2, KCl, and myosin subfragment 1 (S-1) were slower and the critical concentrations for this process were higher than in intact protein. Intact and cleaved actin formed morphologically indistinguishable filaments and copolymerized in the presence of MgCl2. The affinity of actin for S-1 was decreased by about 10-fold due to subtilisin cleavage, but the S-1 ATPase activity was activated to the same Vmax value by both intact and cleaved actins. DNase I inhibition measurements revealed lower affinity of cleaved actin for DNase I than that of intact protein. These results are discussed in terms of actin's structure.
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Affiliation(s)
- D Schwyter
- Department of Chemistry and Biochemistry, University of California, Los Angeles 90024
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