Smooth muscle hypertrophy in distal airways of sensitized infant rhesus monkeys exposed to house dust mite allergen

Authors

  • M.-U. T. Tran,

    1. Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA, USA,
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  • A. J. Weir,

    1. Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA, USA,
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  • M. V. Fanucchi,

    1. Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA, USA,
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  • A. E. Rodriguez,

    1. Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA, USA,
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  • L. M. Pantle,

    1. Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA, USA,
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  • S. M. Smiley-Jewell,

    1. Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA, USA,
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  • L. S. Van Winkle,

    1. Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA, USA,
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  • M. J. Evans,

    1. Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA, USA,
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  • L. A. Miller,

    1. Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA, USA,
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  • E. S. Schelegle,

    1. Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA, USA,
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  • L. J. Gershwin,

    1. Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, CA, USA
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  • D. M. Hyde,

    1. Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA, USA,
    2. California Regional Primate Research Center, School of Veterinary Medicine, University of California, Davis, CA, USA.
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  • C. G. Plopper

    1. Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA, USA,
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Suzette Smiley-Jewell, Department of Anatomy, Physiology and Cell Biology School of Veterinary Medicine One Shields Avenue University of California Davis, CA 95616, USA.
E-mail: smsmiley@ucdavis.edu

Summary

Background Airway smooth muscle hypertrophy is closely associated with the pathophysiology of hyper-reactive airways in allergic asthma.

Objective To determine whether repeated exposure to allergens during postnatal lung development promotes remodelling of airway smooth muscle.

Methods Infant, male rhesus monkeys (30-day-old) were sensitized to house dust mite allergen (HDMA) and then exposed to HDMA aerosol periodically over 5 months. Smooth muscle mass and bundle size and abundance in conducting airways were measured and compared with age-matched control (filtered air-exposed) monkeys.

Results Total smooth muscle mass and average bundle size were significantly greater in the conducting airways of monkeys exposed to HDMA. Smooth muscle bundle abundance was not affected by exposure to HDMA.

Conclusion Repeated cycles of allergen exposure alter postnatal morphogenesis of smooth muscle, affecting both total mass and bundle size, in conducting airways of infant monkeys.

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