ABSTRACT
Purpose
To develop novel bioactive-chylomicrons to solve oral delivery obstacles of Berberine chloride and target the lymphatic system.
Methods
Berberine-loaded bioactive-chylomicrons were prepared and underwent full in vitro characterization. Intestinal permeability was appraised via both non-everted gut sac model and Caco-2 cell model. Furthermore, Bioactive-chylomicrons’ cellular uptake and distribution were examined by laser scanning confocal microscopy. Finally, a novel chylomicron flow-blockage assay on tissue and cellular levels were elaborated to assess the lymphatic targeting ability.
Results
Berberine-loaded chylomicrons showed spherical vesicles of size (175.6 nm), PDI (0.229), zeta potential (−16 .6 mV) and entrapment efficiency (95.5%). Ex-vivo intestinal permeability studies demonstrated 10.5 fold enhancement in permeability of Berberine-loaded chylomicrons over free Berberine. Moreover, Caco-2 studies revealed significant improvement in chylomicrons’ permeability and cellular uptake. Furthermore, confocal microscopy analyses revealed 2 fold increase in berberine-loaded chylomicrons’ intracellular fluorescence. Lymphatic targeting models were successfully elaborated using cycloheximide protein synthesis inhibitor. Such models demonstrated 47 and 27.5% reduction in ex-vivo and Caco-2 permeability respectively. Finally, a good rank order correlation was established between different permeability assessment techniques.
Conclusion
The findings shed the light on the underlying mechanisms of Berberine bioavailability improvement. Consequently, berberine-loaded chylomicrons could be considered as promising bioactive-nanocarriers for Berberine lymphatic targeting and bioavailability improvement.
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Abbreviations
- BER:
-
Berberine chloride
- BSA:
-
Bovine serum albumin
- CM:
-
Chylomicron
- CHX:
-
Cycloheximide
- LSCM:
-
Laser scanning confocal microscopy
- P-gp:
-
p-glycoprotein
- PDI:
-
Polydispersity index
- ROI:
-
Region of interest
- CMo :
-
Unmodified chylomicron (surfactant free)
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Acknowledgements
The authors are deeply grateful to Centre of Excellence for Research in Regenerative Medicine and its Applications (CERRMA) at Faculty of Medicine, Alexandria University, Egypt where Cell culture experiments were conducted. The authors also acknowledge the Medical Research Centre I at the Faculty of Medicine, Alexandria University. Egypt where the HPLC analyses were performed.
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Elsheikh, M.A., Elnaggar, Y.S.R., Otify, D.Y. et al. Bioactive-Chylomicrons for Oral Lymphatic Targeting of Berberine Chloride: Novel Flow-Blockage Assay in Tissue-Based and Caco-2 Cell Line Models. Pharm Res 35, 18 (2018). https://doi.org/10.1007/s11095-017-2307-z
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DOI: https://doi.org/10.1007/s11095-017-2307-z