Abstract
Primaquine phosphate is a drug of choice for the treatment of malarial relapse. However, poor drug concentration in the hepatocytes and dose-related toxicity pose severe limitations. We report a nanocarboplex of primaquine phosphate by a simple in situ process using dextran sulphate as a carbohydrate polymer and pullulan as an asialoglycoprotein receptor ligand. Our aim was to preferentially enhance accumulation of the nanocarboplex in the hepatocytes. The in situ pullulan-anchored primaquine nanocarboplex was prepared by simple addition of a solution of dextran sulphate and pullulan with stabilizer to a measured quantity of primaquine phosphate in a vial, followed by shaking to obtain the primaquine phosphate nanocarboplex ready for injection. The nanocarboplex was characterized and evaluated in vivo for pharmacokinetics and biodistribution in the rat model. Specific uptake by hepatocytes in the liver was also quantified. Increase in t ½ with significant uptake in the RES organ was observed. More importantly, anchoring pullulan favored high liver uptake and preferential accumulation in the hepatocytes with a hepatocytes/nonparenchymal cells ratio of 75:25. The in situ primaquine phosphate nanocarboplex anchored with pullulan provides both a significant technological advantage and the desired targeting to the hepatocytes.
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Abbreviations
- PQ:
-
Primaquine phosphate
- DS:
-
Dextran sulphate
- ASGP-R:
-
Asialoglycoprotein receptor
- PU:
-
Pullulan
- HIP:
-
Hydrophobic ion pair
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Acknowledgments
The authors are thankful to Phoenix Pharmaceutical LLC, Ohio, USA for providing senior research fellowship; Tata Institute of Fundamental Research, Mumbai, India for powder X-ray diffraction study; and the Sophisticated Analytical Instrument Facility (SAIF) of Indian Institute of Technology (IIT), Mumbai, India for scanning electron microscopy study. The authors are also thankful to Mr. Nyaneshwar Nagmoti and Mr. Jayesh B. Dhodi for their valuable support for in vivo study on rats.
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Joshi, V.M., Devarajan, P.V. Receptor-mediated hepatocyte-targeted delivery of primaquine phosphate nanocarboplex using a carbohydrate ligand. Drug Deliv. and Transl. Res. 4, 353–364 (2014). https://doi.org/10.1007/s13346-014-0200-4
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DOI: https://doi.org/10.1007/s13346-014-0200-4