The venom of the Eastern coral snake Micrurus fulvius can cause respiratory paralysis in the bitten patient, which is attributable to -neurotoxins (-NTx). The aim of this work was to study the biodistribution and lymphatic tracking by molecular imaging of the main -NTx of M. fulvius venom. -NTx was bioconjugated with the chelator diethylenetriaminepenta-acetic acid (DTPA) and radiolabeled with the radionuclide Gallium-67. Radiolabeling efficiency was 60%-78%; radiochemical purity 92%; and stability at 48 h 85%. The median lethal dose (LD50) and PLA(2) activity of bioconjugated -NTx decreased 3 and 2.5 times, respectively, in comparison with native -NTx. The immune recognition by polyclonal antibodies decreased 10 times. Biodistribution of -NTx-DTPA-Ga-67 in rats showed increased uptake in popliteal, lumbar nodes and kidneys that was not observed with Ga-67-free. Accumulation in organs at 24 h was less than 1%, except for kidneys, where the average was 3.7%. The inoculation site works as a depot, since 10% of the initial dose of -NTx-DTPA-Ga-67 remains there for up to 48 h. This work clearly demonstrates the lymphatic system participation in the biodistribution of -NTx-DTPA-Ga-67. Our approach could be applied to analyze the role of the lymphatic system in snakebite for a better understanding of envenoming.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/614979 |
| Date | 26 March 2016 |
| Creators | Vergara, Irene, Castillo, Erick, Romero-Piña, Mario, Torres-Viquez, Itzel, Paniagua, Dayanira, Boyer, Leslie, Alagón, Alejandro, Medina, Luis |
| Contributors | Univ Arizona, Coll Med, Venom Immunochem Pharmacol & Emergency Response V |
| Publisher | MDPI AG |
| Source Sets | University of Arizona |
| Language | English |
| Detected Language | English |
| Type | Article |
| Rights | © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/). |
| Relation | http://www.mdpi.com/2072-6651/8/4/85 |
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