Abstract
Purpose
This study aims to understand the process and mechanism of oral drug absorption from liposomes and to verify the usefulness of liposomal formulation for poorly soluble drugs.
Methods
Cyclosporine A (CsA) was used as a model drug and entrapped into Dipalmitoylphosphatidylcholine (DPPC) and distearoylphosphatidylcholine (DSPC) liposomes. Molecular state of CsA in the liposomes was analyzed using powder X-ray diffraction (PXRD) and polarized light microscopy (PLM). Release profiles of CsA from liposomes were observed in fasted state simulated intestinal fluid (FaSSIF). Oral absorption of CsA from liposomal formulations were investigated in rats.
Results
PXRD and PLM analyses suggested that CsA exists in the lipid layer of liposomes as a molecular dispersed state. Although both liposomes retained CsA stably in the simple buffer, DPPC liposomes quickly released CsA within 10 min in FaSSIF due to the interaction with bile acid. In contrast, effect of bile acid was negligible in DSPC, indicating a high resistivity to membrane perturbation. Oral bioavailability of CsA from liposomal formulations were almost comparable with that from a marketed product (Neoral). However, the absorption profiles were clearly different. CsA was absorbed quickly from DPPC liposomes and Neoral, while sustained absorption profile was observed from DSPC liposomes. Further study in which ritonavir was co-entrapped in the liposomes with CsA showed the higher efficacy of ritonavir to increase oral bioavailability of CsA.
Conclusion
Liposomes allows the appropriate formulation design for oral delivery of poorly soluble drugs, not only to increase the extent but also to control the rate of absorption.
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Change history
10 June 2022
A Correction to this paper has been published: https://doi.org/10.1007/s11095-022-03310-1
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ACKNOWLEDGMENTS AND DISCLOSURES
The authors would like to acknowledge Dr. Satomi Onoue and Dr. Kohei Yamada for the experimental support of PXRD and PLM. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Minami, K., Kataoka, M., Takagi, T. et al. Liposomal Formulation for Oral Delivery of Cyclosporine A: Usefulness as a Semisolid-Dispersion System. Pharm Res 39, 977–987 (2022). https://doi.org/10.1007/s11095-022-03276-0
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DOI: https://doi.org/10.1007/s11095-022-03276-0