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Long-term vaginal antibody delivery: delivery systems and biodistribution
W M Saltzman1, J K Sherwood, D R Adams
1School of Chemical Engineering, Cornell University, Ithaca, New York 14853, USA. saltzman@cheme.cornell.edu
Biotechnology and Bioengineering
|January 5, 2000
Summary
Vaginal polymer rings provide prolonged antibody delivery for up to 30 days, maintaining high concentrations in secretions. This method may offer sustained mucosal and systemic antibody levels for long-term protection against infections.
Area of Science:
- Immunology
- Pharmacokinetics
- Drug Delivery Systems
Background:
- Topical antibody delivery to mucosal surfaces offers potential for long-term protection against infectious diseases.
- Vaginal mucosal immunity is crucial for preventing sexually transmitted infections.
Purpose of the Study:
- To examine the biodistribution and pharmacokinetics of antibodies delivered vaginally over 30 days in a mouse model.
- To evaluate the efficacy of polymer vaginal rings for sustained antibody release.
Main Methods:
- Antibodies (IgG, IgM) were administered via polymer vaginal rings in mice for 30 days.
- Biodistribution of radiolabeled antibodies was assessed in vaginal secretions, blood, and other tissues.
- Pharmacokinetic modeling was used to determine antibody delivery and elimination rates.
Main Results:
- High antibody concentrations were maintained in vaginal secretions for up to 30 days.
- Systemic antibody levels in blood and tissues were approximately 100-fold lower than mucosal levels.
- Vaginal antibody elimination half-life was ~3 hours; IgG1 blood clearance half-life was >1 day.
Conclusions:
- Polymer vaginal rings enable sustained antibody delivery to the vaginal mucosa.
- This approach may be effective for achieving long-term mucosal and systemic antibody levels for disease prevention.
- Results inform the design of controlled antibody delivery devices for vaginal applications.