Effect of a short-term infusion with soybean oil-based lipid emulsion on phagocytic responses of canine peripheral blood polymorphonuclear neutrophilic leukocytes.
BACKGROUND
The use of soybean oil-based lipid emulsion (SO-based LE) in parenteral nutrition has been reported to impair neutrophil functions in humans and rodents. As yet, little is understood about the effects of SO-based LE on canine immune responses.


OBJECTIVE
A short-term infusion with SO-based LE affects the phagocytic responses of canine peripheral blood polymorphonuclear neutrophilic leukocytes (PMNs).


METHODS
Twenty-four healthy Beagle dogs.


METHODS
Experimental study. Dogs were randomly assigned into groups of six and administered a 2-hour IV infusion with 0.9% NaCl solution or sufficient SO-based LE (INTRALIPOS 20%) to supply 40, 100, and 200% of the basal energy requirement (BER). PMN functions were determined after collecting blood samples before, immediately after, and 24 hours after the infusion.


RESULTS
None of the treatments significantly affected the phagocytic capacity of PMNs or circulating leukocyte numbers. The infusion providing 200% of BERs significantly reduced PMN oxidative burst activity, filamentous actin polymerization, and Cdc42 Rho guanosine triphosphatase activity immediately after its delivery. However, these functions were restored to pre-infusion values 24 hours after the infusion. The lower calorie infusions did not have these effects.


CONCLUSIONS
These results suggest that short-term infusions with a supraphysiological dose of SO-based LE may decrease the immune functions of canine PMNs. However, more long-term studies will be needed to extrapolate the effect of SO-based LE with clinically relevant doses in a practical situation.
Kang
J-H
JH
Laboratory of Veterinary Internal Medicine, Department of Veterinary Medicine, College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk, Korea.
Yang
M-P
MP
D000199:Actins / Q000378:metabolism; D000818:Animals; D004285:Dogs / Q000502:physiology*; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D005217:Fat Emulsions, Intravenous / Q000008:administration & dosage* / Q000494:pharmacology*; D009504:Neutrophils / Q000187:drug effects* / Q000378:metabolism; D010587:Phagocytosis / Q000187:drug effects*; D016897:Respiratory Burst / Q000187:drug effects; D013024:Soybean Oil / Q000494:pharmacology*; D020764:cdc42 GTP-Binding Protein / Q000378:metabolism
D000199:Actins; D005217:Fat Emulsions, Intravenous; D013024:Soybean Oil; D020764:cdc42 GTP-Binding Protein