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188Re-labeled hydroxyapatite particles for radiation synovectomy.
Summary
A novel method efficiently labels hydroxyapatite (HA) particles with rhenium-188 (188Re) for radiation synovectomy. The resulting 188Re-HA particles demonstrate high stability and retention in vivo.
Area of Science:
- Nuclear medicine
- Radiopharmaceutical chemistry
- Biomaterials science
Background:
- Radiation synovectomy is a treatment for inflammatory joint diseases.
- Hydroxyapatite (HA) particles are suitable carriers for therapeutic radionuclides.
- Efficient labeling of HA with rhenium-188 (188Re) is crucial for effective radiation synovectomy.
Purpose of the Study:
- To develop and standardize a procedure for labeling hydroxyapatite (HA) particles with 188Re.
- To evaluate the stability and in vivo behavior of the 188Re-labeled HA particles.
Main Methods:
- Hydroxyapatite particles were labeled with 188Re in an acidic medium.
- Particle size was analyzed using laser diffraction.
- Radiochemical purity and stability were assessed over 4 days.
- In vivo retention was evaluated after intra-articular injection in rats.
Main Results:
- The labeling procedure achieved high yields (99%) with 188Re.
- HA particle size remained unchanged post-labeling.
- 188Re-HA exhibited high radiochemical purity (99%) after 4 days.
- Approximately 98% of 188Re-HA was retained in the rat knee joint after 48 hours.
Conclusions:
- A robust and efficient method for 188Re labeling of HA particles was established.
- The 188Re-HA conjugate is stable and shows excellent retention in the joint, suitable for radiation synovectomy.