An optimized condition is identified to prepare linear poly(amido amine)s via Michael Addition polymerization of trifunctional amine, 4-(aminomethyl)piperidine (AMPD), with an equimolar diacrylamide, N,N-cystaminebis(acrylamide) (BAC). Poly(ethylene glycol) (PEG) and cholesterol (CE) are conjugated to linear poly(BAC-AMPD) through the reactions with the secondary amino groups in the backbone, respectively, to form poly(BAC-AMPD)-g-PEG-g-CE. The chemical structures of poly(BAC-AMPD) and poly(BAC-AMPD)-g-PEG-g-CE are characterized using NMR and gel permeation chromatography (GPC). Transmission electron microscopy (TEM), dynamic light scattering (DLS) and (1)H NMR results show that micelles with PEG shells and hydrophobic cores composed of poly(BAC-AMPD) and CE are formed via self-assembly of poly(BAC-AMPD)-g-PEG-g-CE in aqueous solution, and the micelles of poly(BAC-AMPD)-g-PEG-g-CE can be degraded by the presence of L-dithiothreitol and show a limited cytotoxicity in vitro. The anti-cancer drug, doxorubicin (DOX), can be loaded into the micelles. The DOX loaded micelles of poly(BAC-AMPD)-g-PEG-g-CE show pH- and redox-responsive drug release and redox-induced formation of aggregates, and it is shown that the DOX loaded micelles can deliver DOX into cells and show a higher efficacy in killing cancer cells than free drug.
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http://dx.doi.org/10.1002/mabi.201300339 | DOI Listing |
Biomaterials
December 2024
School of Pharmaceutical Sciences (Shenzhen), Shenzhen Campus of Sun Yat-sen University, Shenzhen, 518107, China. Electronic address:
As the elite force of our immune system, T cells play a determining role in the effectiveness of cancer immunotherapy. However, the clever tumor cells construct a strong immunosuppressive tumor microenvironment (TME) fortress to resist the attack of T cells. Herein, a magnesium peroxide (MP)-based biomimetic nanoigniter loaded with doxorubicin (DOX) and metformin (MET) is rationally designed (D/M-MP@LM) to awake T cell-mediated cancer immunotherapy via comprehensively destroying the strong TME fortress.
View Article and Find Full Text PDFInt J Biol Macromol
January 2025
Medical Microbiology and Immunology Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt.
Collagen nanoparticles (collagen-NPs) possess numerous applications owing to their minimal immunogenicity, non-toxic nature, excellent biodegradability and biocompatibility. This study presents a novel sustainable technique for one-step green synthesis of hydrolyzed fish collagen-NPs (HFC-NPs) using a hot-water extract of Ulva fasciata biomass. HFC-NPs were characterized using TEM, FTIR, XRD, ζ-potential analyses, etc.
View Article and Find Full Text PDFInt J Nanomedicine
January 2025
Key Laboratory of Nanomedical Technology (Education Department of Fujian Province), Department of Pharmaceutical Analysis, School of Pharmacy, Fujian Medical University, Fuzhou, 350122, People's Republic of China.
Background: The dense and fibrotic nature of the pancreatic tumor microenvironment significantly contributes to tumor invasion and metastasis. This challenging environment acts as a formidable barrier, hindering effective drug penetration and delivery, which ultimately limits the efficacy of conventional cancer treatments. Gold nanoparticles (AuNPs) have emerged as promising nanocarriers to overcome the extracellular matrix barrier; however, their limited targeting precision, poor delivery efficiency, and insufficient photothermal conversion present challenges.
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
College of pharmacy, Xinxiang Medical University, 453003 Xinxiang, PR China; Pingyuan Laboratory, Xinxiang, Henan 453007, PR China. Electronic address:
Effective delivery of sufficient doxorubicin (DOX) molecules in tumors is hindered by the complex biological barriers. Herein, a DOX-loaded sodium alginate-based injectable hydrogel (DOX@MHB-conj-SA) was designed by the Michael addition reactions between the sulfydryl in cross-linkers and the double bonds in a derivative of sodium alginate. DOX@MHB-conj-SA was administrated to CT26 tumor-bearing mice via peritumoral injection for locoregional treatment of colorectal cancer by inducing apoptosis and pyroptosis.
View Article and Find Full Text PDFACS Appl Bio Mater
January 2025
Nanjing University of Science and Technology, 200, Xiaolingwei Street, Nanjing 210094, China.
The resection of bone tumors results in large bone defects with some residual tumor cells, and the treatment of this type of bone defect area often faces a dilemma, namely, the trade-off between bone repair and antitumor after the resection of bone tumors. In order to promote local bone repair, and at the same time inhibit tumor recurrence by continuous and controlled drug administration, we developed a multifunctional NIR-responsive scaffold, whose main components are polylactic acid and MXene, and loaded with PLGA/DOX microspheres, and we hope that the scaffold can take into account both antitumor and bone repair in the bidirectional modulation effect of NIR. The results showed that the scaffold with 1% MXene content had relatively good performance in photothermal therapy (PT) and other aspects, and it could be smoothly increased to 50 °C within 2 min under NIR illumination, and the drug release of microspheres was increased by 10% after illumination compared with that at body temperature.
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