Title:Dual Rifampicin and Isoniazid Mannose-Decorated Lipopolysaccharide Nanospheres for Macrophage-
Targeted Lung Delivery
Volume: 20
Issue: 10
Author(s): Mumuni Sumaila, Pradeep Kumar, Philemon Ubanako, Samson A. Adeyemi and Yahya E. Choonara*
Affiliation:
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic
Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 7 York Road, Parktown
2193, South Africa
Keywords:
Lipid-polysaccharide nanosystem, targeted-delivery, RAW 264.7 macrophage, cellular uptake, mycobacterium tuberculosis, pulmonary delivery.
Abstract:
Background: Currently, the treatment protocols for tuberculosis (TB) have several challenges,
such as inconsistent oral bioavailability, dose-related adverse effects, and off-target drug toxicity.
Methods: This research reports the design and characterization of rifampicin (RIF) and isoniazid (INH)
loaded hybrid lipid-polysaccharide nanoparticles using the solvent injection method, and demonstrated
the influence of conjugated mannosyl residue on macrophage targeting and intracellular drug delivery
capacity.
Results: The nanospheres, herein called mannose-decorated lipopolysaccharide nanoparticles, were
spherical in shape, exhibiting average sizes less than 120 nm (PDI<0.20) and positive zeta potentials.
Drug encapsulation was greater than 50% for rifampicin and 60% for isoniazid. The pH-responsive drug
release was sustained over a 48-hour period and preferentially released more rifampicin/isoniazid in a
simulated acidic phagolysosomal environment (pH 4.8) than in a simulated physiological medium. TGA
and FTIR analysis confirmed successful mannose-grafting on nanoparticle surface and optimal degree
of mannosylation was achieved within 48-hour mannose-lipopolysaccharide reaction time. The mannosylated
nanoparticles were biocompatible and demonstrated a significant improvement towards uptake
by RAW 264.7 cells, producing higher intracellular RIF/INH accumulation when compared to the unmannosylated
nanocarriers.
Conclusion: Overall, the experimental results suggested that mannose-decorated lipopolysaccharide
nanosystems hold promise towards safe and efficacious macrophage-targeted delivery of anti-TB therapeutics.