Study of the accumulation of gallium-68-labeled folic acid conjugates in various etiologies inflammation foci

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Abstract

In recent years, folate receptors have been considered as a target for radiopharmaceutical drugs. For this purpose, new, previously unexplored compounds based on folic acid were synthesized.

Objective. Study of the accumulation of gallium-68-labeled folic acid conjugates in various etiologies inflammation foci.

Material and methods. The objects of the research were folic acid derivatives labeled with gallium-68. Systemic juvenile idiopathic arthritis was chosen as a pathology model. Acute inflammatory processes of soft tissues of septic and aseptic etiology were selected as differential models.

Results. The results obtained in the study showed a significantly elevated level of accumulation in the juvenile idiopathic arthritis focus compared to healthy rat paws and accumulation in the foci of differential models of the inflammatory process, which confirms the macrophage-mediated pathway of accumulation of the studied compounds.

Conclusion. The data obtained allow us to conclude about the diagnostic potential of radiolabeled conjugates based on folic acid in the radionuclide diagnosis of rheumatoid and other diseases characterized by a pronounced macrophage immune response.

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About the authors

K. A. Lunyova

A.I. Burnazyan Federal Medical Biophysical Center of the FMBA of Russia; Moscow State Academy of Veterinary Medicine and Biotechnology – MVA by K.I. Skryabin

Author for correspondence.
Email: christfmbc@gmail.com
ORCID iD: 0000-0002-1256-9873

Research Scientist, Laboratory of Preclinical and Clinical Studies of Radiopharmaceuticals; Post-graduate Student, Department of Chemistry

Russian Federation, Moscow; Moscow

A. A. Larenkov

A.I. Burnazyan Federal Medical Biophysical Center of the FMBA of Russia

Email: anton.larenkov@gmail.com
ORCID iD: 0000-0003-4810-4346

Ph.D. (Chem.), Head of the Laboratory of Technology and Methods of Control of Radiopharmaceuticals

Russian Federation, Moscow

M. G. Rakhimov

A.I. Burnazyan Federal Medical Biophysical Center of the FMBA of Russia

Email: marat.rakhimov89@gmail.com
ORCID iD: 0000-0002-7521-5976

Engineer, Laboratory of Technology and Methods of Control of Radiopharmaceuticals

Russian Federation, Moscow

A. S. Lunev

A.I. Burnazyan Federal Medical Biophysical Center of the FMBA of Russia

Email: mr.alekslunev@gmail.com
ORCID iD: 0000-0002-8392-8343

Ph.D. (Biol.), Senior Research Scientist, Laboratory of Preclinical and Clinical Studies of Radiopharmaceuticals

Russian Federation, Moscow

O. E. Klementyeva

A.I. Burnazyan Federal Medical Biophysical Center of the FMBA of Russia

Email: klementyeva.olga@gmail.com
ORCID iD: 0000-0002-6604-0860

Ph.D. (Biol.), Head of the Laboratory of Preclinical and Clinical Studies of Radiopharmaceuticals

Russian Federation, Moscow

F. I. Vasilevich

Moscow State Academy of Veterinary Medicine and Biotechnology – MVA by K.I. Skryabin

Email: f-vasilevich@inbox.ru
ORCID iD: 0000-0003-0786-5317

Dr.Sc. (Veterinary), Professor, Academician of the Russian Academy of Sciences, Head of the Department of Parasitology and Veterinary and Sanitary Expertise

Russian Federation, Moscow

A. E. Machulkin

Lomonosov Moscow State University

Email: alekseymachulkin@rambler.ru
ORCID iD: 0000-0001-7975-0346

Ph.D. (Chem.), Research Scientist

Russian Federation, Moscow

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Supplementary files

Supplementary Files
Action
1. JATS XML
2. Figure 1. Chemical structure of FA-I and FA-II molecules with their constituent fragments labeled: folic acid (vector fragment); NODAGA chelator for 68Ga coordination; linkers; (HE)2-group to optimize pharmacokinetics

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3. Figure 2. Accumulation in the kidneys (%/g) 60 min after intravenous administration of [68Ga]Ga-FA-I and [68Ga]Ga-FA-II in the kidneys of rats in normal conditions and in inflammatory processes of various etiologies

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4. Figure 3. Accumulation of the investigated radiopharmaceutical compounds in the foci of model pathologies

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5. Figure 4. Mean accumulations of [68Ga]Ga-FA-I and [68Ga]Ga-FA-II in paws with juvenile idiopathic arthritis and in healthy paws of rats (% of administered activity)

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6. Figure 5. Mean accumulations of [68Ga]Ga-FA-I and [68Ga]Ga-FA-II in CB and AV foci and in healthy rat muscle tissue (%/g of tissue)

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