Cited by 233Immunotherapy and Immune ResponsesNanoparticle-Based Drug DeliveryAdvanced Drug Delivery Systems

pH-Responsive Poly(d,l-lactic-co-glycolic acid) Nanoparticles with Rapid Antigen Release Behavior Promote Immune Response

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Liu, Qi, Chen, Xiaoming, Jia, Jilei, Zhang, Weifeng, Yang, Tingyuan, Wang, Lianyan, Ma, Guanghui·2015·ACS Nano

Abstract

In the quest to treat intracellular infectious diseases and virus infection, nanoparticles (NPs) have been considered to be efficient tools for inducing potent immune responses, specifically cellular immunity. Antigen processing and presenting by antigen presenting cells (APCs) could influence immune response, especially the priming of T-cell-mediated cellular immunity. Here, we fabricated pH-responsive poly(D,L-lactic-co-glycolic acid) (PLGA) NPs with rapid antigen intracellular release behavior in APCs. The NPs, which had thin shells and large inner space, contain ammonium bicarbonate (NH4HCO3), which could regulate release in endosomes and lysosomes, acting as an antigen release promoter in dendritic cells (DCs), and were coencapsulated with antigen (ovalbumin, OVA). Hydrogen ions (H(+)) in DC endosomes and lysosomes (pH ∼5.0 and 6.5) could react with NH4HCO3 to generate NH3 and CO2, which broke NPs and released antigens. After uptake by DCs, antigens encapsulated in pH-responsive PLGA NPs could escape from lysosomes into the cytoplasm and be cross-presented. Moreover, the NPs induced up-regulation of co-stimulatory molecules and stimulated cytokine production. Mouse immunization with pH-responsive PLGA NPs induced greater lymphocyte activation, more antigen-specific CD8(+) T cells, stronger cytotoxic capacity (IFN-γ and granzyme B), enhanced antigen-specific IgG antibodies, and higher serum IgG2a/IgG1, indicating cellular immunity. The NPs also improved generation of memory T cells to protect against reinfection. Thus, pH-responsive PLGA NPs, which induced strong cellular immune responses and offered antibody protection, could be potentially useful as effective vaccine delivery and adjuvant systems for the therapy of intracellular infectious diseases and virus infection.

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Crossref · 10.1021/nn5066793

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  • Liu et al. fabricated pH-responsive PLGA nanoparticles encapsulating NH4HCO3 to trigger antigen release from endo-lysosomes; NH4HCO3 interacted with protons, produced CO2 and NH3 to disrupt endo-lysosomes and promote antigen release into cytosol.

    “Liu et al. fabricated pH-responsive poly(D,L-lactic-co-glycolic acid) (PLGA) nanoparticles encapsulating ammonium bicarbonate (NH4HCO3) to trigger antigen release from endo-lysosomes. NH4HCO3 interacted with protons in endo-lysosomes, then produced CO2 and NH3 to disrupt the endo-lysosomes and promote antigen release into the cytosol [183].”

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Authors
Liu, Q., Chen, X., Jia, J., Zhang, W., Yang, T., Wang, L., & Ma, G.
Affiliations
Chinese Academy of Sciences (CN)
Corresponding author
  • Wang, Lianyan
  • Ma, Guanghui
Venue
ACS Nano
Published
2015-04-24
Volume
9
Issue
5
Pages
4925-4938
ISSN
  • 1936-0851 (ISSN-L)
  • 1936-086X
OpenAlex
W2025990308
Cited by
233
References
47
Citations by year
2026: 4 · 2025: 5 · 2024: 18 · 2023: 25 · 2022: 22 · 2021: 36 · 2020: 28 · 2019: 26 · 2018: 33 · 2017: 18 · 2016: 17 · 2015: 1
FWCI
11.31
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • ACS Nano (publishedVersion)
  • PubMed (publishedVersion)
  • Institute of Process Engineering, CAS Institutional Repository (submittedVersion, cc-by-nc-sa)
Funders
  • Ministry of Science and Technology of the People's Republic of China (2012AA02A406, 2013CB531500)
  • National Natural Science Foundation of China (21476243)
  • Chinese Academy of Sciences (KSCX2-EW-R-19)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
  • Physical Sciences › Materials Science › Biomaterials › Nanoparticle-Based Drug Delivery
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmaceutical Science › Advanced Drug Delivery Systems
Keywords
pH-responsive nanoparticles, PLGA nanoparticles, antigen release, ammonium bicarbonate, dendritic cells, cross-presentation, cell-mediated immunity, ovalbumin, vaccine adjuvants, T cell immunity, memory T cells, intracellular infection, viral infection
MeSH terms
Polylactic Acid-Polyglycolic Acid Copolymer, Adjuvants, Immunologic, Animals, Antigens, Dendritic Cells, Drug Carriers, Hydrogen-Ion Concentration, Immunity, Cellular, Lymphocyte Activation, Ovalbumin, Polyglycolic Acid, T-Lymphocytes, Time Factors, Vaccines, Antigen Presentation, Lactic Acid, Intracellular Space, Mice, Nanoparticles, Drug Liberation

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