Letizia Zullo1, Ambra Buschiazzo2, Michela Massollo3, Mattia Riondato4, Alessia Democrito4, Cecilia Marini2,4,5, Fabio Benfenati6,7, Gianmario Sambuceti2,4,5. 1. Center for Synaptic Neuroscience and Technology, Italian Institute of Technology, Genoa, Italy letizia.zullo@iit.it. 2. Division of Nuclear Medicine, Department of Health Science, University of Genoa, Genoa, Italy. 3. Nuclear Medicine Unit, EO Galliera Hospital, Genoa, Italy. 4. Nuclear Medicine Unit, IRCCS San Martino, Genoa, Italy. 5. Institute of Molecular Bioimaging and Physiology (IBFM), CNR, Milan, Italy; and. 6. Center for Synaptic Neuroscience and Technology, Italian Institute of Technology, Genoa, Italy. 7. Department of Experimental Medicine, University of Genoa, Genoa, Italy.
Abstract
This study aimed to develop a method of administering 18F-FDG to the common octopus in order to perform a PET biodistribution assay characterizing glucose metabolism in organs and regenerating tissues. Methods: Seven animals (two of which had a regenerating arm) were anesthetized with 3.7% MgCl2 in artificial seawater and then injected with 18-30 MBq of isosmotic 18F-FDG through either the left branchial heart or the anterior vena cava. After an uptake time of about 50 min, the animals were sacrificed and placed on the bed of a small-animal PET scanner, and 10-min static acquisitions were obtained at 3-4 bed positions to visualize the entire body. To confirm image interpretation, internal organs of interest were collected and counted with a γ-counter. Results: Administration through the anterior vena cava resulted in a good full-body distribution of 18F-FDG as seen on the PET images. Uptake was high in the mantle mass and relatively lower in the arms. In particular, the brain, optic lobes, and arms were clearly identified and were measured for their uptake (SUVmax: 6.57 ± 1.86, 7.59 ± 1.66, and 1.12 ± 0.06, respectively). Interestingly, 18F-FDG uptake was up to 3-fold higher in the highly proliferating areas of regenerating arms. Conclusion: This study represents a stepping-stone to the use of noninvasive functional techniques for addressing questions about invertebrate neuroscience and regenerative medicine.
This study aimed to develop a method of administering 18F-FDG to the common octopus in order to perform a PET biodistribution assay characterizing glucose metabolism in organs and regenerating tissues. Methods: Seven animals (two of which had a regenerating arm) were anesthetized with 3.7% MgCl2 in artificial seawater and then injected with 18-30 MBq of isosmotic 18F-FDG through either the left branchial heart or the anterior vena cava. After an uptake time of about 50 min, the animals were sacrificed and placed on the bed of a small-animal PET scanner, and 10-min static acquisitions were obtained at 3-4 bed positions to visualize the entire body. To confirm image interpretation, internal organs of interest were collected and counted with a γ-counter. Results: Administration through the anterior vena cava resulted in a good full-body distribution of 18F-FDG as seen on the PET images. Uptake was high in the mantle mass and relatively lower in the arms. In particular, the brain, optic lobes, and arms were clearly identified and were measured for their uptake (SUVmax: 6.57 ± 1.86, 7.59 ± 1.66, and 1.12 ± 0.06, respectively). Interestingly, 18F-FDG uptake was up to 3-fold higher in the highly proliferating areas of regenerating arms. Conclusion: This study represents a stepping-stone to the use of noninvasive functional techniques for addressing questions about invertebrate neuroscience and regenerative medicine.