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. 2023 Oct 9;22:169. doi: 10.1186/s12943-023-01865-0

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 4 — The schematic of cancer immunotherapy using NLG919@DEAP-DPPA-1 nanoparticles. The multifunctional peptide demonstrates its antitumor mechanism in the tumor microenvironment. Transmission electron microscopy images of nanoparticles under various pH conditions, with or without recombinant human MMP-2 (rhMMP-2), are shown. The treatment efficacy of peptide nanoparticles and the measurement of CD8 + T cells in melanoma-bearing mice are also presented. The scale bars for the TEM images are 100 nm. Reprint from [129] with a permission from Springer Nature