Intravenous injection of tridihomo-γ-linolenoyl-glycerol into mice and its effects on delayed-type hypersensitivity

Abstract

Highly purified tridihomo-γ-linolenoyl-glycerol (DGLA-TG) was emulsified with egg yolk lecithin as a 10% (wt/vol) DGLA-TG emulsion. We injected 0.05 or 0.5 mL of the emulsion into mice through the tail vein and investigated its effects on the fatty acid composition of spleen cells and on delayed-type hypersensitivity (DTH) response. At 1 h after the injection, dihomo-γ-linolenic acid (DGLA) concentrations were increased significantly in the total phospholipid fraction of spleen cells from 1.21±0.13 mol% to 2.09 ±0.74 mol% (P<0.02) and 7.95±1.25 mol% (P<0.001) in the 0.05-mL and 0.05-mL groups respectively. Mice, which had already been immunized with sheep red blood cells (SRBC), were challenged by the injection of SRBC into the right-hind footpad. Intravenous injection into mice with 0.5 mL of the emulsion immediately before the challenge almost completely suppressed DTH response measured by the swelling of the right-hind footpads 24 h thereafter. This inhibitory effect on the DTH response was significant with as little as 0.05 mL of the emulsion, whereas a soybean oil emulsion was not effective at all. In conclusion, intravenous injection of a DGLA emulsion increased DGLA concentrations in immune cells within 1 h and suppressed the DTH reaction.

DOI: 10.1007/BF02537493

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Cite this paper

@article{Taki1993IntravenousIO, title={Intravenous injection of tridihomo-γ-linolenoyl-glycerol into mice and its effects on delayed-type hypersensitivity}, author={Hirofumi Taki and Norio Nakamura and Tomohito Hamazaki and Masashi Kobayashi}, journal={Lipids}, year={1993}, volume={28}, pages={873-876} }