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. 2021 Jun 14;19:182. doi: 10.1186/s12951-021-00919-z

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© The Author(s) 2021

Open AccessThis 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. 2 — Drug release and IDO inhibition efficiency. a, b Drug release kinetics, tested with PPF NPs in buffer solutions with pH 5.5 and 7.4 in the presence and absence of photo-irradiation (IR). a NLG919 release profiles. b ZnF₁₆Pc release profiles. c IDO inhibition, examined by measuring Kyn released from HeLa cells. Hela cells were first treated with IFN-γ along with either free NLG919 or PPF NPs. Kyn in the supernatant was quantified 48 h later, and compared to PBS-treated cells. The experiments were conducted in triplicate. Values are presented as means ± SD