On the possibility of using hyaluronic acid in a composition with rhenium-188 for radiosynoviorthesis

Introduction. Osteoarthritis is one of the most common joint diseases. The number of patients is growing rapidly and by 2050, the number of people in the world suffering from osteoarthritis is expected to exceed 1 billion. In a number of European countries, radiosynoviorthesis is used as a treatment. It is based on irradiation of the joint synovium with intra-articular administration of various radiopharmaceuticals containing β-emitting radionuclides. Aim. Development of a radiopharmaceutical composition for radiosynoviorthesis based on rhenium-188 and hyaluronic acid as a particle stabilizer. Materials and methods. Sodium perrhenate solution, 188 Re was obtained from a 188 W/ 188 Re generator "GREN-1" (JSC "SSC RF – IPPE", Russia). Eluate activity was measured on an ISOMED 2010 (PTW-Freiburg, Germany). Radiochemical purity was determined by thin-layer chromatography on thin-layer silica gel plates on aluminum substrate in acetone. The activity of chromatogram was measured on a Scan-RAM chromatogram scanner (LabLogic Systems Ltd., United Kingdom). pH was measured on S20 Seven Easy pH meter (METTLER TOLEDO, Switzerland). Particle size was determined by laser diffraction on an LA-350 device with a detection range of 0.1–1000 μm (HORIBA, Japan). Accumulation in the joint was determined on a Wizard 2480 gamma counter (PerkinElmer, USA) after intra-articular administration of the composition to mature conventional albino rats (females). Results and discussion. The study included a comparison of the physic-chemical properties of the synthesized compositions with different volume activities, the optimal concentration of hyaluronic acid, and the methods for obtaining the radiopharmaceutical composition both from the liquid and freeze-dried reagents. The biological behavior of the radiopharmaceutical composition after intra-articular administration to mature conventional albino rats (females) were studied. Conclusion. Radiopharmaceutical composition containing rhenium-188, tin dichloride and hyaluronic acid with a radiochemical purity of more than 95 % has been developed. The accumulation of the composition in the knee joint was more than 96 % 3 hours after intra-articular administration. This composition is of interest for further study as a radiopharmaceutical for radiosynoviorthesis.