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Non-invasive screening method for simultaneous evaluation of in vivo growth factor release profiles from multiple
Diederik H R Kempen1, Lichun Lu, Kelly L Classic
1Tissue Engineering and Biomaterials Laboratory, Departments of Orthopedic Surgery and Biomedical Engineering, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA.
Summary
This study developed a non-invasive method using scintillation probes to simultaneously track multiple growth factor release profiles from implants in vivo. The method accurately measured release, offering a valuable screening tool for drug delivery applications.
Area of Science:
- Biomedical Engineering
- Materials Science
- Pharmacology
Background:
- Evaluating in vivo drug release from multiple implants non-invasively is challenging.
- Existing methods often require animal sacrifice or are limited in scope.
- Accurate monitoring of growth factor release is crucial for regenerative medicine and drug delivery.
Purpose of the Study:
- To develop and validate a scintillation probe-based method for simultaneous in vivo evaluation of multiple implant release profiles.
- To assess the accuracy and limitations of scintillation probes for this application.
- To establish a non-invasive screening tool for drug delivery systems.
Main Methods:
- In vitro characterization of scintillation probes, including geometric dependence and saturation effects.
- In vitro simulation of four subcutaneous limb implants in rats to assess probe interference.
- In vivo validation using a rat model with four sustained-release carriers loaded with (125)I-BMP-2.
- Comparison of non-invasive scintillation probe measurements with ex vivo radioisotope counting at 42 and 84 days.
Main Results:
- Scintillation probes exhibited geometric dependence and saturation at high activities.
- Minimal interference was observed between closely positioned probes in simulated in vivo conditions.
- The non-invasive method showed good correlation with ex vivo counting for all four carriers at both time points.
- Successful simultaneous measurement of four release profiles was achieved with minimal cross-talk.
Conclusions:
- Scintillation probes can be effectively used for simultaneous, non-invasive monitoring of multiple in vivo release profiles.
- The developed method offers a reliable screening tool for diverse drug delivery applications.
- This technique minimizes the need for animal sacrifice during early-stage drug delivery development.
