Accumulation and excretion of morphine by Calliphora stygia, an Australian blow fly species of forensic importance |
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Authors: | Parry Samuel Linton Stuart M Francis Paul S O'Donnell Michael J Toop Tes |
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Affiliation: | a School of Life and Environmental Sciences, Deakin University, Pigdons Road, Waurn Ponds, Victoria 3217, Australia b Department of Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada |
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Abstract: | This study examined the ability of the forensically important blow fly, Calliphora stygia to actively excrete morphine, thereby maintaining a low morphine level within its body when fed on a diet containing morphine at low (7 pmol g−1) and high (17.5 pmol g−1) concentrations. Morphine was accumulated within the bodies of maggots (≈70% within the tissues) at concentrations which were lower than that of the meat (3-24%). The morphine content of the initial developing stages (second and third instar maggots) maintained on the high morphine diet was higher than those on the low morphine diet. Morphine was cleared from the body with negatively exponential kinetics (High morphine group: Morphine (pmol g−1 wet weight) = 8425e−0.014t. Low morphine group: Morphine (pmol g−1 wet weight) = 2180e−0.010t). Clearance constants for morphine by animals in both groups were similar and thus both groups had a similar ability to excrete morphine. The Malpighian tubules of maggots were able to actively secrete morphine using a transport mechanism that transports small type II organic cations, such as morphine and quinine. The rate of morphine secretion by the Malpighian tubules could explain the clearance of the drug by the maggots. As the morphine was transported across the Malpighian tubules cells, a significant proportion was metabolised into a compound that is yet to be fully characterised. |
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Keywords: | Calliphora stygia Morphine Forensic entomology Malpighian tubule Morphine metabolism |
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