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In vitro effects of epinephrine, norepinephrine, and dobutamine on lipopolysaccharide-stimulated production of tumor necrosis factor-α, interleukin-6, and interleukin-10 in blood from healthy dogs

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  • 1 Comparative Internal Medicine Laboratory, Veterinary Health Center, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211.
  • | 2 Thompson Laboratory for Regenerative Orthopaedics, School of Medicine, University of Missouri, Columbia, MO 65211.

Abstract

OBJECTIVE

To determine the in vitro effects of epinephrine, norepinephrine, and dobutamine on lipopolysaccharide (LPS)-stimulated production of tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and interleukin-10 (IL-10) in blood from healthy dogs.

SAMPLES

Blood samples from 9 healthy dogs.

PROCEDURES

Blood samples were incubated with LPS from Escherichia coli O127:B8 or PBSS (control) for 1 hour. Afterward, the samples were incubated with 10μM epinephrine, norepinephrine, or dobutamine or with saline (0.9% NaCl) solution (control) for 23 hours. Leukocyte viability was assessed by use of trypan-blue exclusion in blood from 2 dogs to ensure cell viability was not altered by the catecholamines. Tumor necrosis factor-α, IL-6, and IL-10 concentrations were measured in the supernatant in duplicate with a canine-specific multiplex bead-based assay. Blood samples from 2 dogs were used to create dose-response curves to evaluate whether the observed cytokine modulation was dependent on catecholamine concentration.

RESULTS

Incubation of blood with epinephrine and norepinephrine significantly increased LPS-stimulated production of IL-10, compared with the control. Epinephrine and norepinephrine significantly decreased LPS-stimulated production of TNF-α, compared with the control. Epinephrine and norepinephrine did not significantly alter LPS-stimulated production of IL-6. Dobutamine did not alter catecholamine production.

CONCLUSIONS AND CLINICAL RELEVANCE

Epinephrine and norepinephrine, but not dobutamine, had immunomodulatory effects on LPS-stimulated TNF-α and IL-10 production in blood from healthy dogs in this in vitro model of sepsis. Data suggested that dobutamine may have immune system-sparing effects in dogs with sepsis.

Contributor Notes

Dr. Merrill's present address is Pet Emergency and Referral Center, Spokane WA 99202.

Dr. Hull's present address is Hill's Pet Nutrition Inc, Topeka, KS 66603.

Address correspondence to Dr. DeClue (decluea@missouri.edu).