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Synthesis and biological evaluation of 99mTc-DHPM complex: a potential new radiopharmaceutical for lung imaging studies

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Abstract

In the recent years interests on dihydropyrimidinone and their analogues have increased potentially due to their wide range of pharmacological/biological activities. Synthesis, radiolabeling with technetium-99 m (99mTc) and biological evaluation of 5-etoxycarbonyl-4-phenyl-6-methyl-3,4-dihydro-(1H)-pyrimidine-2-one (DHPM) were studied in this present work. After synthesis complexation of DHPM with 99mTc was carried out using stannous chloride as the reducing agent. The complex (99mTc-DHPM) was characterized by thin layer chromatography, radio-HPLC technique and determination of partition co-efficient. Radiochemical stability and particle size distribution of the complex were also measured. Biodistribution/scintigraphy studies were performed in rats and rabbits to evaluate the pharmacological characteristics of this complex. The radiochemical purity of the complex was over 95% as studied by thin layer chromatography and radio-HPLC. It was stable over 24 h at room temperature. Its partition coefficient indicated that it was a lipophilic complex. According to the European Pharmacopeia, >80% of 99mTc labeled radiopharmaceutical (99mTc-MAA) in the size range 10–50 μm, must be accumulated in the lungs 15 min after intravenous administration. In this study >85% of the 99mTc-DHPM complex in the average size of 40 μm. Biodistribution studies of 99mTc-DHPM in rat revealed that the complex accumulated in the lung with high uptake and good retention after intravenous administration. Scintigraphic studies in rabbit also revealed that most of the administered radiolabeled complex was accumulated in the lungs and after 1 h slowly excreted through the renal system. The lung uptake (ID%/g) was 10.12, 9.67, 8.60 and 5.01 and the lung/liver ratio was 7.49, 2.88, 2.62 and 1.87 at 2, 15, 30 and 60 min post-injection, respectively. These results suggested that 99mTc-DHPM could be suitable as a potential lung perfusion imaging agent. Further studies with 99mTc-DHPM and its derivatives are warranted to develop new 99mTc-labeled imaging agents for clinical applications.

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Acknowledgments

We are thankful to Indian Council of Medical Research (ICMR), New Delhi, India for providing financial support.

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Authors and Affiliations

  1. Department of Nuclear Medicine, Indian Institute of Chemical Biology, 4, Raja S.C. Mullick Road, Kolkata, 700 032, India

    Kakali De, Susmita Chandra & Mridula Misra

  2. Regional Radiation Medicine Centre, Thakurpukur Cancer Research Centre, Kolkata, 700 063, India

    Bhart Sarkar & Santanu Ganguly

Authors
  1. Kakali De
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  2. Susmita Chandra
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  3. Bhart Sarkar
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  4. Santanu Ganguly
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  5. Mridula Misra
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Correspondence to Mridula Misra.

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De, K., Chandra, S., Sarkar, B. et al. Synthesis and biological evaluation of 99mTc-DHPM complex: a potential new radiopharmaceutical for lung imaging studies. J Radioanal Nucl Chem 283, 621–628 (2010). https://doi.org/10.1007/s10967-009-0398-7

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  • DOI: https://doi.org/10.1007/s10967-009-0398-7

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