Abstract
Mycobacterium tuberculosis (MTB) is one of the most threatening pathogens for its latent infection in macrophages. The intracellular MTB isolated itself from drugs and could spread via macrophages. Therefore, a mannose-modified macrophage-targeting solid lipid nanoparticle, MAN-IC-SLN, loading the pH-sensitive prodrug of isoniazid (INH), was designed to treat the latent tuberculosis infection. The surface of SLNs was modified by a synthesized 6-octadecylimino-hexane-1,2,3,4,5-pentanol (MAN-SA) to target macrophages, and the modified SLNs showed a higher cell uptake in macrophages (97.2%) than unmodified SLNs (42.4%). The prodrug, isonicotinic acid octylidene-hydrazide (INH-CHO), was synthesized to achieve the pH-sensitive release of INH in macrophages. The INH-CHO-loaded SLNs exhibited a pH-sensitive release profile and accomplished a higher accumulated release in pH 5.5 media (82.63 ± 2.12%) compared with the release in pH 7.4 media (58.83 ± 3.84%). Mycobacterium smegmatis was used as a substitute for MTB, and the MAN-IC-SLNs showed a fourfold increase of intracellular antibiotic efficacy and enhanced macrophage uptake because of the pH-sensitive degradation of INH-CHO and MAN-SA in SLNs, respectively. For the in vivo antibiotic efficacy test, the SLNs group displayed an 83% decrease of the colony-forming unit while the free INH group only showed a 60% decrease. The study demonstrates that macrophage targeting and pH-sensitive SLNs can be used as a promising platform for the latent tuberculosis infection.
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Change history
19 April 2022
A Correction to this paper has been published: https://doi.org/10.1007/s13346-022-01160-3
Abbreviations
- MTB:
-
Mycobacterium tuberculosis
- INH:
-
Isoniazid
- MAN-SA:
-
6-octadecylimino-hexane-1,2,3,4,5-pentanol
- INH-CHO:
-
Isonicotinic acid octylidene-hydrazide
- H-NMR:
-
Hydrogen nuclear magnetic resonance
- FTIR:
-
Fourier transform infrared spectroscopy
- XPS:
-
X-ray photoelectron spectroscopy
- MSG:
-
Mycobacterium smegmatis
- WHO:
-
World Health Organization
- ROS:
-
Reactive oxygen species
- LTBI:
-
Latent tuberculosis infection
- SLN:
-
Solid lipid nanoparticles
- PP:
-
Palmityl palmitate
- SA:
-
Stearyl amine
- Leu:
-
Leucine
- P-188:
-
Poloxamer188
- NaH2PO4-2H2O:
-
Sodium dihydrogen phosphate dihydrate
- NaOH:
-
Sodium hydroxide
- MHB:
-
Mueller-Hinton Broth media
- TLC:
-
Thin-layer chromatography
- MAN:
-
Mannose
- SDS:
-
Sodium dodecyl sulfate
- DLS:
-
Dynamic light scattering method
- TEM:
-
Transmission electron microscopy
- XRD:
-
X-ray powder diffraction
- DSC:
-
Differential scanning calorimetry analysis
- TG:
-
Thermogravimetric analysis
- EA:
-
Element analysis
- TCD:
-
Thermal conductivity detector
- NGI:
-
Next-generation impactor
- CCK:
-
Cell counting kit-8
- CLSM:
-
Confocal laser scanning microscope
- C6:
-
Coumarin 6
- PFA:
-
Paraformaldehyde
- DAPI:
-
4′,6-diamidino-2-phenylindole
- FC:
-
Flow Cytometry
- MBC:
-
Minimum bactericidal concentration
- IHC:
-
Immunohistochemistry staining
- ALB:
-
Albumin
- TB:
-
Total protein
- ALT:
-
Alanine aminotransferase
- AST:
-
Aspartate aminotransferase
- HE staining:
-
Hematoxylin-eosin staining
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Acknowledgments
Thanks for the assistance of Hangzhou Yuhao Chemical Technology Co., Ltd. (Hangzhou, China) in synthesis isonicotinic acid octylene-hydrazide (INH-CHO) and the help of Xi’an Ruixi Biological Technology Co. Ltd. (Xi’an, China) in the synthesis of 6-octadecylimino-hexane-1,2,3,4,5-pentanol (MAN-SA).
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This work was supported by the National Science Foundation of China [grant numbers 81703431, 81673375].
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Cheng Ma designed and completed the study and the manuscript. Mingjun Wu and Weifen Ye participated in the in vitro evaluation tests. Wenhao Wang and Wenhua Wang assisted in the in vivo tests. Thanks for the guidance for the study and the revision of the manuscript by Zhengwei Huang, Xiangyu Ma and Ying Huang. The study was performed under the supervision by Xin Pan and Chuanbin Wu.
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All authors declare the experiments comply with the current laws of China. The in vivo tests were assessed based on Wistar rats, which were purchased from Southern Medical University Laboratory Animal Center. The in vivo animal tests were approved by the institutional animal care and use committee of Sun Yat-sen University (No. SYSU-IACUC-2019-000308).
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Ma, C., Wu, M., Ye, W. et al. Inhalable solid lipid nanoparticles for intracellular tuberculosis infection therapy: macrophage-targeting and pH-sensitive properties. Drug Deliv. and Transl. Res. 11, 1218–1235 (2021). https://doi.org/10.1007/s13346-020-00849-7
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DOI: https://doi.org/10.1007/s13346-020-00849-7