Christian Rosas-Salazar1, Meghan H Shilts2, Zheng-Zheng Tang3, Qilin Hong3, Kedir N Turi2, Brittney M Snyder2, Derek A Wiggins2, Christian E Lynch2, Tebeb Gebretsadik4, R Stokes Peebles2, Larry J Anderson5, Suman R Das6, Tina V Hartert2. 1. Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tenn. Electronic address: c.rosas.salazar@vumc.org. 2. Department of Medicine, Vanderbilt University Medical Center, Nashville, Tenn. 3. Department of Biostatistics and Medical Informatics, University of Wisconsin-Madison, Madison, Wis. 4. Department of Biostatistics, Vanderbilt University Medical Center, Nashville, Tenn. 5. Department of Pediatrics, Emory University and Children's Healthcare of Atlanta, Atlanta, Ga. 6. Department of Medicine, Vanderbilt University Medical Center, Nashville, Tenn; Department of Otolaryngology-Head and Neck Surgery, Vanderbilt University Medical Center, Nashville, Tenn. Electronic address: suman.r.das@vumc.org.
Abstract
BACKGROUND: The impact of breast-feeding on certain childhood respiratory illnesses remains controversial. OBJECTIVE: We sought to examine the effect of exclusive breast-feeding on the early-life upper respiratory tract (URT) and gut microbiome, the URT immune response in infancy, and the risk of common pediatric respiratory diseases. METHODS: We analyzed data from a birth cohort of healthy infants with prospective ascertainment of breast-feeding patterns and common pediatric pulmonary and atopic outcomes. In a subset of infants, we also characterized the URT and gut microbiome using 16S ribosomal RNA sequencing and measured 9 URT cytokines using magnetic bead-based assays. RESULTS: Of the 1949 infants enrolled, 1495 (76.71%) had 4-year data. In adjusted analyses, exclusive breast-feeding (1) had an inverse dose-response on the ⍺-diversity of the early-life URT and gut microbiome, (2) was positively associated with the URT levels of IFN-α, IFN-γ, and IL-17A in infancy, and (3) had a protective dose-response on the development of a lower respiratory tract infection in infancy, 4-year current asthma, and 4-year ever allergic rhinitis (odds ratio [95% CI] for each 4 weeks of exclusive breast-feeding, 0.95 [0.91-0.99], 0.95 [0.90-0.99], and 0.95 [0.92-0.99], respectively). In exploratory analyses, we also found that the protective association of exclusive breast-feeding on 4-year current asthma was mediated through its impact on the gut microbiome (P = .03). CONCLUSIONS: Our results support a protective causal role of exclusive breast-feeding in the risk of developing a lower respiratory tract infection in infancy and asthma and allergic rhinitis in childhood. They also shed light on potential mechanisms of these associations, including the effect of exclusive breast-feeding on the gut microbiome.
BACKGROUND: The impact of breast-feeding on certain childhood respiratory illnesses remains controversial. OBJECTIVE: We sought to examine the effect of exclusive breast-feeding on the early-life upper respiratory tract (URT) and gut microbiome, the URT immune response in infancy, and the risk of common pediatric respiratory diseases. METHODS: We analyzed data from a birth cohort of healthy infants with prospective ascertainment of breast-feeding patterns and common pediatric pulmonary and atopic outcomes. In a subset of infants, we also characterized the URT and gut microbiome using 16S ribosomal RNA sequencing and measured 9 URT cytokines using magnetic bead-based assays. RESULTS: Of the 1949 infants enrolled, 1495 (76.71%) had 4-year data. In adjusted analyses, exclusive breast-feeding (1) had an inverse dose-response on the ⍺-diversity of the early-life URT and gut microbiome, (2) was positively associated with the URT levels of IFN-α, IFN-γ, and IL-17A in infancy, and (3) had a protective dose-response on the development of a lower respiratory tract infection in infancy, 4-year current asthma, and 4-year ever allergic rhinitis (odds ratio [95% CI] for each 4 weeks of exclusive breast-feeding, 0.95 [0.91-0.99], 0.95 [0.90-0.99], and 0.95 [0.92-0.99], respectively). In exploratory analyses, we also found that the protective association of exclusive breast-feeding on 4-year current asthma was mediated through its impact on the gut microbiome (P = .03). CONCLUSIONS: Our results support a protective causal role of exclusive breast-feeding in the risk of developing a lower respiratory tract infection in infancy and asthma and allergic rhinitis in childhood. They also shed light on potential mechanisms of these associations, including the effect of exclusive breast-feeding on the gut microbiome.
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