Lipids

, Volume 48, Issue 9, pp 889–897 | Cite as

The Effectiveness of Fish Oil Supplementation in Asthmatic Rats is Limited by an Inefficient Action on ASM Function

  • D. T. S. Z. Miranda
  • A. L. Zanatta
  • B. C. L. Dias
  • R. T. H. Fogaça
  • J. B. B. Maurer
  • L. Donatti
  • P. C. Calder
  • A. Nishiyama
Original Article

Abstract

Episodes of acute exacerbation are the major clinical feature of asthma and therefore represent an important focus for developing novel therapies for this disease. There are many reports that the n-3 fatty acids found in fish oil exert anti-inflammatory effects, but there are few studies of the action of fish oil on airway smooth muscle (ASM) function. In the present investigation, we evaluated the effect of fish oil supplementation on smooth muscle force of contraction in ovalbumin-induced asthmatic Wistar rats, and its consequences on static lung compliance, mucus production, leukocyte chemotaxis and production of proinflammatory cytokines. Fish oil supplementation suppressed the infiltration of inflammatory cells into the lung in asthmatic animals (2.04 ± 0.19 × 106 cells vs. 3.33 ± 0.43 × 106 cells in the control asthmatic group; P < 0.05). Static lung compliance increased with fish oil supplementation in asthmatic rats (0.640 ± 0.053 mL/cm H2O vs. 0.399 ± 0.043 mL/cm H2O; P < 0.05). However, fish oil did not prevent asthma-associated lung eosinophilia and did not affect the concentrations of tumor necrosis factor-α and interleukin-1β in lung tissue or the proportion of the airways obliterated with mucus. Fish oil had no effect on the force of contraction in asthmatic rats in response to acetylcholine (3.026 ± 0.274 mN vs. 2.813 ± 0.364 mN in the control asthmatic group). In conclusion, although fish oil exerts some benefits in this model of asthma, its effectiveness appears to be limited by an inefficient action on airway smooth muscle function.

Keywords

Fish oil n-3 Fatty acids Asthma Inflammation Airway smooth muscle Cytokine 

Abbreviations

A

Asthmatic group

Ach

Acetylcholine

AFO

Asthmatic fish oil group

Ai

Airway internal area

Amo

Airway outer muscle area

Ao

Airway outer area

ASM

Airway smooth muscle

BALF

Bronchoalveolar lavage fluid

C

Control group

FO

Fish oil group

IL-1β

Interleukin 1β

Iso

Isoproterenol

OVA

Ovalbumin

PBS

Phosphate-buffed saline

Pi

Airway internal perimeter

Pmo

Airway outer muscle perimeter

Po

Airway outer perimeter

PUFA

Polyunsaturated fatty acid(s)

SEM

Standard error of the mean

TNF-α

Tumor necrosis factor-α

WAi

Inner wall area

WAo

Adventitial wall area

WAT

Total wall area

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Copyright information

© AOCS 2013

Authors and Affiliations

  • D. T. S. Z. Miranda
    • 1
  • A. L. Zanatta
    • 1
  • B. C. L. Dias
    • 1
  • R. T. H. Fogaça
    • 1
  • J. B. B. Maurer
    • 2
  • L. Donatti
    • 3
  • P. C. Calder
    • 4
    • 5
  • A. Nishiyama
    • 1
  1. 1.Departamento de Fisiologia, Centro PolitécnicoUniversidade Federal do ParanáCuritibaBrazil
  2. 2.Departamento de Bioquímica, Centro PolitécnicoUniversidade Federal do ParanáCuritibaBrazil
  3. 3.Departamento de Biologia Celular, Centro PolitécnicoUniversidade Federal do ParanáCuritibaBrazil
  4. 4.Human Development & Health Academic Unit, Faculty of Medicine, Southampton General HospitalUniversity of SouthamptonSouthamptonUK
  5. 5.College of Applied Medical SciencesKing Saudi UniversityRiyadhKingdom of Saudi Arabia

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