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Oliveira A, Araújo A, Rodrigues LC, Silva CS, Reis RL, Neves NM, Leão P, Martins A. Metronidazole Delivery Nanosystem Able To Reduce the Pathogenicity of Bacteria in Colorectal Infection. Biomacromolecules 2022; 23:2415-2427. [PMID: 35623028 PMCID: PMC9774670 DOI: 10.1021/acs.biomac.2c00186] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Metronidazole (MTZ) is a drug potentially used for the treatment of intestinal infections, namely, the ones caused by colorectal surgery. The traditional routes of administration decrease its local effectiveness and present off-site effects. To circumvent such limitations, herein a drug delivery system (DDS) based on MTZ-loaded nanoparticles (NPs) immobilized at the surface of electrospun fibrous meshes is proposed. MTZ at different concentrations (1, 2, 5, and 10 mg mL-1) was loaded into chitosan-sodium tripolyphosphate NPs. The MTZ loaded into NPs at the highest concentration showed a quick release in the first 12 h, followed by a gradual release. This DDS was not toxic to human colonic cells. When tested against different bacterial strains, a significant reduction of Escherichia coli and Staphylococcus aureus was observed, but no effect was found against Enterococcus faecalis. Therefore, this DDS offers high potential to locally prevent the occurrence of infections after colorectal anastomosis.
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Affiliation(s)
- Ana Oliveira
- 3B’s
Research Group, I3Bs − Research Institute on Biomaterials,
Biodegradables & Biomimetics of University of Minho, Headquarters
of the European Institute of Excellence on Tissue Engineering &
Regenerative Medicine, AvePark - Parque de Ciência e Tecnologia, Zona Industrial
da Gandra, Barco, Guimarães 4805-017 Portugal,Life
and Health Sciences Research Institute (ICVS), School of Medicine,
University of Minho, Campus of Gualtar, Braga 4710-057, Portugal,ICVS/3B’s
− PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal
| | - Ana Araújo
- 3B’s
Research Group, I3Bs − Research Institute on Biomaterials,
Biodegradables & Biomimetics of University of Minho, Headquarters
of the European Institute of Excellence on Tissue Engineering &
Regenerative Medicine, AvePark - Parque de Ciência e Tecnologia, Zona Industrial
da Gandra, Barco, Guimarães 4805-017 Portugal,ICVS/3B’s
− PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal
| | - Luísa C. Rodrigues
- 3B’s
Research Group, I3Bs − Research Institute on Biomaterials,
Biodegradables & Biomimetics of University of Minho, Headquarters
of the European Institute of Excellence on Tissue Engineering &
Regenerative Medicine, AvePark - Parque de Ciência e Tecnologia, Zona Industrial
da Gandra, Barco, Guimarães 4805-017 Portugal,ICVS/3B’s
− PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal
| | - Catarina S. Silva
- 3B’s
Research Group, I3Bs − Research Institute on Biomaterials,
Biodegradables & Biomimetics of University of Minho, Headquarters
of the European Institute of Excellence on Tissue Engineering &
Regenerative Medicine, AvePark - Parque de Ciência e Tecnologia, Zona Industrial
da Gandra, Barco, Guimarães 4805-017 Portugal,ICVS/3B’s
− PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal
| | - Rui L. Reis
- 3B’s
Research Group, I3Bs − Research Institute on Biomaterials,
Biodegradables & Biomimetics of University of Minho, Headquarters
of the European Institute of Excellence on Tissue Engineering &
Regenerative Medicine, AvePark - Parque de Ciência e Tecnologia, Zona Industrial
da Gandra, Barco, Guimarães 4805-017 Portugal,ICVS/3B’s
− PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal
| | - Nuno M. Neves
- 3B’s
Research Group, I3Bs − Research Institute on Biomaterials,
Biodegradables & Biomimetics of University of Minho, Headquarters
of the European Institute of Excellence on Tissue Engineering &
Regenerative Medicine, AvePark - Parque de Ciência e Tecnologia, Zona Industrial
da Gandra, Barco, Guimarães 4805-017 Portugal,ICVS/3B’s
− PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal
| | - Pedro Leão
- Life
and Health Sciences Research Institute (ICVS), School of Medicine,
University of Minho, Campus of Gualtar, Braga 4710-057, Portugal,ICVS/3B’s
− PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal
| | - Albino Martins
- 3B’s
Research Group, I3Bs − Research Institute on Biomaterials,
Biodegradables & Biomimetics of University of Minho, Headquarters
of the European Institute of Excellence on Tissue Engineering &
Regenerative Medicine, AvePark - Parque de Ciência e Tecnologia, Zona Industrial
da Gandra, Barco, Guimarães 4805-017 Portugal,ICVS/3B’s
− PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal,
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Smart nanofibres for specific and ultrasensitive nanobiosensors and drug delivery systems. ACTA VET BRNO 2022. [DOI: 10.2754/avb202291020163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Biosensors are dynamically developing analytical devices for the detection of substrates or other bioactive substances. They can be used for quick gas or liquid analyses and the construction of sensitive detection systems. This review highlights the advances and development of biosensors suitable for human and veterinary medicine and, namely, a novel contribution of nanotechnology for ultrasensitive diagnosis and personalized medicine. The synergic effect of nanotechnology and biosensors opens a new dimension for effective treatment and disease detection at their early stages.
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Low Concentrated Fractionalized Nanofibers as Suitable Fillers for Optimization of Structural–Functional Parameters of Dead Space Gel Implants after Rectal Extirpation. Gels 2022; 8:gels8030158. [PMID: 35323271 PMCID: PMC8949947 DOI: 10.3390/gels8030158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 02/25/2022] [Accepted: 02/28/2022] [Indexed: 02/01/2023] Open
Abstract
Dead space after rectal resection in colorectal surgery is an area with a high risk of complications. In this study, our goal was to develop a novel 3D implant based on composite hydrogels enriched with fractionalized nanofibers. We employed, as a novel approach in abdominal surgery, the application of agarose gels functionalized with fractionalized nanofibers on pieces dozens of microns large with a well-preserved nano-substructure. This retained excellent cell accommodation and proliferation, while nanofiber structures in separated islets allowed cells a free migration throughout the gel. We found these low-concentrated fractionalized nanofibers to be a good tool for structural and biomechanical optimization of the 3D hydrogel implants. In addition, this nano-structuralized system can serve as a convenient drug delivery system for a controlled release of encapsulated bioactive substances from the nanofiber core. Thus, we present novel 3D nanofiber-based gels for controlled release, with a possibility to modify both their biomechanical properties and drug release intended for 3D lesions healing after a rectal extirpation, hysterectomy, or pelvic exenteration.
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