Radiosynthesis of (99m)Tc(CO)3-Clinafloxacin Dithiocarbamate and Its Biological Evaluation as a Potential Staphylococcus aureus Infection Radiotracer.
Nucl Med Mol Imaging 2011;
45:248-54. [PMID:
24900014 DOI:
10.1007/s13139-011-0106-8]
[Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2011] [Revised: 08/21/2011] [Accepted: 08/23/2011] [Indexed: 10/17/2022] Open
Abstract
BACKGROUND
Clinafloxacin dithiocarbamate (CNND) was radiolabeled with technetium-99m ((99m)Tc) using [(99m)Tc(CO)3(H2O)3](+) and assessed for its radiochemical stability in saline and serum, its in vitro binding with methicillin-resistant Staphylococcus aureus (MRSA) and biodistribution in female nude mice (FNM) artificially infected with live and heat-killed MRSA.
METHODS
In normal saline (NS) the (99m)Tc(CO)3-clinafloxacin dithiocarbamate ((99m)Tc(CO)3-CNND) showed radiochemical stability with a maximum value of 99.10 ± 0.20% and remained stable up to 4 h (92.65 ± 0.18%).
RESULTS
In human serum at 37°C within 16 h of incubation, 14.85% side products as a result of de-tagging developed. Incubation with MRSA gave saturated binding with a maximum value of 72.75 ± 1.20%. Almost six-fold higher uptake was seen in the infected muscle of the FNM as compared to the inflamed and normal muscle. The (99m)Tc(CO)3-CNND complex showed a normal route of excretion from the body of the FNM model.
CONCLUSION
The higher stability in NS, HS, saturated in vitro binding with a live strain of MRSA and six-fold higher uptake in the target organ showed the (99m)Tc(CO)3-CNND complex to be a potential MRSA infection radiotracer.
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