Pharmacodynamic properties for inhibition of cAMP- and cGMP elimination by pentoxifylline remain unaltered in vitro during hypothermia.

Autor: Selli AL; Department of Medical Biology, Experimental and Clinical Pharmacology, UiT - The Arctic University of Norway, Tromsø, Norway. anders.lund.selli@uit.no., Kuzmiszyn AK; Department of Medical Biology, Experimental and Clinical Pharmacology, UiT - The Arctic University of Norway, Tromsø, Norway.; Research and Development Department, Norwegian Air Ambulance Foundation, Oslo, Norway.; Division of Surgical Medicine and Intensive Care, University Hospital of North Norway, Tromsø, Norway., Smaglyukova N; Department of Medical Biology, Experimental and Clinical Pharmacology, UiT - The Arctic University of Norway, Tromsø, Norway., Kondratiev T; Anesthesia and Critical Care Research Group, Department of Clinical Medicine, UiT - The Arctic University of Norway, Tromsø, Norway., Fuskevåg OM; Division of Diagnostic Services, Department of Laboratory Medicine, University Hospital of North Norway, Tromsø, Norway., Sager G; Department of Medical Biology, Experimental and Clinical Pharmacology, UiT - The Arctic University of Norway, Tromsø, Norway., Dietrichs ES; Department of Medical Biology, Experimental and Clinical Pharmacology, UiT - The Arctic University of Norway, Tromsø, Norway.; Center for Psychopharmacology, Diakonhjemmet Hospital, Oslo, Norway.
Jazyk: angličtina
Zdroj: Scandinavian journal of trauma, resuscitation and emergency medicine [Scand J Trauma Resusc Emerg Med] 2022 Dec 15; Vol. 30 (1), pp. 73. Date of Electronic Publication: 2022 Dec 15.
DOI: 10.1186/s13049-022-01060-y
Abstrakt: Background: Rewarming from hypothermia is associated with severe complications, one of which is hypothermia-induced cardiac dysfunction. This condition is characterized by decreased cardiac output accompanied by increased total peripheral resistance. This contributes to mortality rate approaching 40%. Despite this, no pharmacological interventions are recommended for these patients below 30 °C. Raising the intracellular levels of cAMP and/or cGMP, through PDE3- and PDE5-inhibitors respectively, have showed the ability to alleviate hypothermia-induced cardiac dysfunction in vivo. Drugs that raise levels of both cAMP and cGMP could therefore prove beneficial in patients suffering from hypothermia-induced cardiac dysfunction.
Methods: The unselective PDE-inhibitor pentoxifylline was investigated to determine its ability to reach the intracellular space, inhibit PDE3 and PDE5 and inhibit cellular efflux of cAMP and cGMP at temperatures 37, 34, 30, 28, 24 and 20 °C. Recombinant human PDE-enzymes and human erythrocytes were used in the experiments. IC 50 -values were calculated at all temperatures to determine temperature-dependent changes.
Results: At 20 °C, the IC 50 -value for PDE5-mediated enzymatic breakdown of cGMP was significantly increased compared to normothermia (IC 50 : 39.4 µM ± 10.9 µM vs. 7.70 µM ± 0.265 µM, p-value = 0.011). No other significant changes in IC 50 -values were observed during hypothermia.
Conclusions: This study shows that pentoxifylline has minimal temperature-dependent pharmacodynamic changes, and that it can inhibit elimination of both cAMP and cGMP at low temperatures. This can potentially be effective treatment of hypothermia-induced cardiac dysfunction.
Trial Registration: Not applicable.
(© 2022. The Author(s).)
Databáze: MEDLINE
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