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Liver targeting of interferon through pullulan conjugation
Pharmaceutical Research
|December 1, 1996
Summary
Interferon (IFN) conjugated with pullulan effectively targets the liver, enhancing antiviral activity. This novel approach uses lower doses and prolongs the therapeutic effect compared to free IFN.
Area of Science:
- Bioconjugation Chemistry
- Drug Delivery Systems
- Hepatology
Background:
- Interferon (IFN) is a crucial antiviral agent.
- Targeting IFN to specific organs like the liver can improve efficacy and reduce side effects.
- Pullulan, a polysaccharide, exhibits high liver affinity, making it a potential carrier for liver-directed drug delivery.
Purpose of the Study:
- To chemically conjugate interferon (IFN) with pullulan to achieve targeted delivery to the liver.
- To evaluate the efficacy of the IFN-pullulan conjugate in enhancing liver accumulation and antiviral activity.
Main Methods:
- Interferon (IFN) was conjugated with pullulan using the cyanuric chloride method.
- The resulting IFN-pullulan conjugate was administered intravenously to mice.
- Body distribution and the activity of the IFN-induced enzyme 2', 5'-oligoadenylate (2-5A) synthetase were assessed in various organs, with a focus on the liver.
Main Results:
- The IFN-pullulan conjugate retained 7-9% of the original biological activity of IFN.
- Pullulan conjugation significantly enhanced IFN's accumulation and retention in the liver.
- The conjugate induced 2-5A synthetase activity in the liver at lower doses than free IFN, with sustained activity for 3 days compared to 1 day for free IFN.
Conclusions:
- IFN-pullulan conjugation is a promising strategy for targeted liver delivery of interferon.
- This approach enhances the antiviral efficacy of IFN in the liver.
- The conjugate allows for lower effective doses and prolonged therapeutic effects.