Abstract
Purpose
The purpose of this study is to know the effect of uptake of mycobacteria on the phagocytic activity of alveolar macrophage (Mφ) cells toward poly(lactic-co-glycolic) acid (PLGA) microspheres (MS) loaded with the anti-tuberculosis agent rifampicin (RFP-PLGA MS).
Materials and Methods
Biological functions such as phagocytic activity toward PLGA MS loaded with fluorescent coumarin (cPLGA MS) and toward polystyrene latex MS (PSL MS), and generation of tumor necrosis factor-α (TNF-α) and nitric oxide (NO) were examined using alveolar Mφ cell NR8383 after they had phagocytosed Mycobacterium bovis Calmette-Guérin (BCG), heat-killed BCG (h-kBCG) or Escherichia coli.
Results
The ingestion of BCG, h-kBCG, and E. coli did not affect the viability of the Mφ cells within 2 days. The phagocytosis caused generation of TNF-α and NO, being more significant with E. coli than with both types of BCGs. The phagocytosis of both types of BCGs stimulated the phagocytic uptake of cPLGA and PSL MS’s, which took place prior to the generation of TNF-α or NO, but that of E. coli suppressed the uptake of both MS’s.
Conclusion
Mycobacterial infection stimulated the phagocytic uptake toward cPLGA MS. These results suggest that RFP-PLGA MS is favorable for overcoming tuberculosis.
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Abbreviations
- BCG:
-
Mycobacterium bovis Calmette-Guérin
- h-kBCG:
-
heat-killed BCG
- CFU:
-
colony-forming units
- ELISA:
-
enzyme-linked immunosorbent assay
- FBS:
-
fetal bovine serum
- Mφ:
-
macrophage
- MOI:
-
multiplicity of infection
- MTB:
-
Mycobacterium tuberculosis
- MS:
-
microspheres
- NO:
-
nitric oxide
- PBS:
-
phosphate-buffered saline
- PLGA:
-
poly(lactic-co-glycolic) acid
- cPLGA MS:
-
PLGA MS loaded with coumarin 6
- RFP-PLGA MS:
-
PLGA MS loaded with rifampicin
- PSL MS:
-
polystyrene latex MS
- RFP:
-
rifampicin
- TNF-α:
-
tumor necrosis factor-α
- WST-8:
-
2-(2-methoxy-4-nitrophenyl)-3-(4-nitrophenyl)-5-(2,4-disulfophenyl)-2H-tetrazolium, monosodium salt
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Acknowledgements
This study was supported, in part, by the “High-Tech Research Center” Project for Private Universities with a matching fund subsidy from MEXT (Ministry for Education, Culture, Sports, Science, and Technology) of Japan, 2004–2008, and by a grant-in-aid for scientific research from MEXT (No. 15300170 to H.T.).
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Hirota, K., Tomoda, K., Inagawa, H. et al. Stimulation of Phagocytic Activity of Alveolar Macrophages Toward Artificial Microspheres by Infection with Mycobacteria. Pharm Res 25, 1420–1430 (2008). https://doi.org/10.1007/s11095-007-9525-8
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DOI: https://doi.org/10.1007/s11095-007-9525-8