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Reference Desk July 2012

Dog-associated House Dust Protects Against Respiratory Infection Linked to Asthma

    WASHINGTON, DC—House dust from homes with dogs appears to protect against infection with a common respiratory virus that is associated with the development of asthma in children, according to researchers from the University of California, San Francisco, presenting their findings recently at the 2012 General Meeting of the American Society for Microbiology.

    "In this study we found that feeding mice house dust from homes that have dogs present protected them against a childhood airway infectious agent, respiratory syncytial virus (RSV). RSV infection is common in infants and can manifest as mild to severe respiratory symptoms. Severe infection in infancy is associated with a higher risk of developing childhood asthma," says Kei Fujimura, a researcher on the study.

    In the study, Fujimura and her colleagues compared three groups of animals: mice fed house dust from homes with dogs before being infected with RSV, mice infected with RSV without exposure to dust, and a control group of mice not infected with RSV.

    "Mice fed dust did not exhibit symptoms associated with RSV-mediated airway infection, such as inflammation and mucus production. They also possessed a distinct gastrointestinal bacterial composition compared to animals not fed dust," says Fujimura.

    Pet ownership, in particular dogs, has previously been associated with protection against childhood asthma development, says Fujimura. Recently she and her colleagues demonstrated that the collection of bacterial communities (the microbiome) in house dust from homes that possess a cat or dog is compositionally distinct from house dust from homes with no pets.

    "This led us to speculate that microbes within dog-associated house dust may colonize the gastrointestinal tract, modulate immune responses and protect the host against the asthmagenic pathogen RSV," says Fujimura. "This study represents the first step towards determining the identity of the microbial species which confer protection against this respiratory pathogen."

    Identification of the specific species and mechanisms underlying this protective effect represents a crucial step towards understanding the critical role of microbes in defining allergic disease outcomes and could lead to development of microbial-based therapies to protect against RSV and ultimately reduce the risk of childhood asthma development, says Fujimura.

    This work represents a collaboration between the Lynch lab at University of California San Francisco and the Lukacs lab at the University of Michigan, Ann Arbor. Tine Demoor, a post-doctoral researcher in the Lukacs lab, performed the mouse experiments and measured airway symptomology associated with RSV infection. Fujimura, Marcus Rauch, and Stephanie Galang from Susan Lynch's group performed microbiome profiling and data analysis of cecal (gut) contents from these animals.

    This research was presented as part of the 2012 General Meeting of the American Society for Microbiology held June 16-19, 2012 in San Francisco, California. A full press kit for the meeting, including tipsheets and additional press releases, can be found online at here.

    American Society for Microbiology
    The American Society for Microbiology is the largest single life science society, composed of over 39,000 scientists and health professionals. ASM's mission is to advance the microbiological sciences as a vehicle for understanding life processes and to apply and communicate this knowledge for the improvement of health and environmental and economic well-being worldwide.

    Source: American Society for Microbiology

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