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Antagonism of croton oil inflammation by topical emu oil in CD-1 mice

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Lipids

Abstract

Emu oil is derived from the emu (Dromaius novaehollandiae), which originated in Australia, and has been reported to have anti-inflammatory properties. Inflammation was induced in anesthetized CD-1 mice by applying 50 μL of 2% croton oil to the inner surface of the left ear. After 2 h, the area was treated with 5μL of emu, fish, flaxseed, olive, or liquified chicken fat, or left untreated. Animals were euthanized at 6 h postapplication of different oils, and earplugs (FP) and plasma samples were collected. Inflammation was evaluated by change in earlobe thickness, increase in weight of EP tissue (compared to the untreated ear), and induction in cytokines interleukin (IL)-1α and tumor necrosis factor-α (TNF-α) in EP homogenates. Al-though reductions relative to control (croton oil) were noted for all treatments, auricular thickness and EP weights were, significantly reduced (−72 and −71%, respectively) only in the emu oil-treated group. IL-1α levels in homogenates of auricular tissue were significantly reduced in the fish oil (−57%) and emu oil (−70%) groups relative to the control group. The cytokine TNF-α from auricular homogenates was significantly reduced in the olive oil (−52%) and emu oil (−60%) treatment groups relative to the control group. Plasma cytokine levels were not changed by croton oil treatment. Although auricular thickness and weight were significantly correlated with each other (r=0.750, P<0.003), auricular thickness but not weight was significantly correlated with cytokine IL-1α (r=0.750, P<0.006) and TNF-α (r=0.690, P<0.02). These studies indicate that topical emu oil has anti-inflammatory properties in the CD-1 mouse that are associated with decreased auricular thickness and weight, and with the cytokines IL-1α and TNF-α.

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Abbreviations

EP:

ear plug

IL:

interleukin

TNF-α:

tumor necrosis factor-α

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Authors and Affiliations

  1. Forsyth Institute, 02115, Boston, Massachusetts

    Subbiah Yoganathan

  2. Center for Health and Disease Research, University of Massachusetts Lowell, 3 Solomont Way, Suite 4, 01854, Lowell, Massachusetts

    Subbiah Yoganathan, Robert Nicolosi, Thomas Wilson, Garry Handelman & Patrick Scollin

  3. Biomedical Research Insitute, 20825, Rockville, Maryland

    Richard Tao

  4. LB Processors, 37035, Chapmansboro, Tennessee

    Paul Binford

  5. Arkansas State University, 72467, Jonesboro, Arkansas

    Frank Orthoefer

Authors
  1. Subbiah Yoganathan
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  2. Robert Nicolosi
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Correspondence to Robert Nicolosi.

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Yoganathan, S., Nicolosi, R., Wilson, T. et al. Antagonism of croton oil inflammation by topical emu oil in CD-1 mice. Lipids 38, 603–607 (2003). https://doi.org/10.1007/s11745-003-1104-y

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  • DOI: https://doi.org/10.1007/s11745-003-1104-y

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