Kinetic characteristics of propofol-induced inhibition of electron-transfer chain and fatty acid oxidation in human and rodent skeletal and cardiac muscles

English version

Autoři: Tomáš Urban ^aff001; Petr Waldauf ^aff001; Adéla Krajčová ^aff001; Kateřina Jiroutková ^aff001; Milada Halačová ^aff001; Valér Džupa ^aff002; Libor Janoušek ^aff003; Eva Pokorná ^aff004; František Duška ^aff001
Působiště autorů: OXYLAB – Mitochondrial Physiology Lab: Charles University, 3 Faculty of Medicine and FNKV University Hospital, Prague, Czech Republic ^aff001; Department of Orthopaedics and Traumatology, Charles University, 3 Faculty of Medicine and FNKV University Hospital, Prague, Czech Republic ^aff002; Transplantation Surgery Department, Institute for Clinical and Experimental Medicine, Prague, Czech Republic ^aff003; Department of Organ Recovery and Transplantation Databases, Institute for Clinical and Experimental Medicine, Prague, Czech Republic ^aff004
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pone.0217254

Souhrn

Introduction

Propofol causes a profound inhibition of fatty acid oxidation and reduces spare electron transfer chain capacity in a range of human and rodent cells and tissues–a feature that might be related to the pathogenesis of Propofol Infusion Syndrome. We aimed to explore the mechanism of propofol-induced alteration of bioenergetic pathways by describing its kinetic characteristics.

Methods

We obtained samples of skeletal and cardiac muscle from Wistar rat (n = 3) and human subjects: vastus lateralis from hip surgery patients (n = 11) and myocardium from brain-dead organ donors (n = 10). We assessed mitochondrial functional indices using standard SUIT protocol and high resolution respirometry in fresh tissue homogenates with or without short-term exposure to a range of propofol concentration (2.5–100 μg/ml). After finding concentrations of propofol causing partial inhibition of a particular pathways, we used that concentration to construct kinetic curves by plotting oxygen flux against substrate concentration during its stepwise titration in the presence or absence of propofol. By spectrophotometry we also measured the influence of the same propofol concentrations on the activity of isolated respiratory complexes.

Results

We found that human muscle and cardiac tissues are more sensitive to propofol-mediated inhibition of bioenergetic pathways than rat’s tissue. In human homogenates, palmitoyl carnitine-driven respiration was inhibited at much lower concentrations of propofol than that required for a reduction of electron transfer chain capacity, suggesting FAO inhibition mechanism different from downstream limitation or carnitine-palmitoyl transferase-1 inhibition. Inhibition of Complex I was characterised by more marked reduction of Vmax, in keeping with non-competitive nature of the inhibition and the pattern was similar to the inhibition of Complex II or electron transfer chain capacity. There was neither inhibition of Complex IV nor increased leak through inner mitochondrial membrane with up to 100 μg/ml of propofol. If measured in isolation by spectrophotometry, propofol 10 μg/ml did not affect the activity of any respiratory complexes.

Conclusion

In human skeletal and heart muscle homogenates, propofol in concentrations that are achieved in propofol-anaesthetized patients, causes a direct inhibition of fatty acid oxidation, in addition to inhibiting flux of electrons through inner mitochondrial membrane. The inhibition is more marked in human as compared to rodent tissues.

Klíčová slova:

Fatty acids – Rodents – Bioenergetics – Mitochondria – Skeletal muscles – Oxygen – Cardiac muscles – Oxidation

Zdroje

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