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Mechanistic Links Between Obesity and Airway Pathobiology Inform Therapies for Obesity-Related Asthma

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Abstract

Obesity-related asthma is associated with a high disease burden and a poor response to existent asthma therapies, suggesting that it is a distinct asthma phenotype. The proposed mechanisms that contribute to obesity-related asthma include the effects of the mechanical load of obesity, adipokine perturbations, and immune dysregulation. Each of these influences airway smooth muscle function. Mechanical fat load alters airway smooth muscle stretch affecting airway wall geometry, airway smooth muscle contractility, and agonist delivery; weight loss strategies, including medically induced weight loss, counter these effects. Among the metabolic disturbances, insulin resistance and free fatty acid receptor activation influence distinct signaling pathways in the airway smooth muscle downstream of both the M2 muscarinic receptor and the β2 adrenergic receptor, such as phospholipase C and the extracellular signal-regulated kinase signaling cascade. Medications that decrease insulin resistance and dyslipidemia are associated with a lower asthma disease burden. Leptin resistance is best understood to modulate muscarinic receptors via the neural pathways but there are no specific therapies for leptin resistance. From the immune perspective, monocytes and T helper cells are involved in systemic pro-inflammatory profiles driven by obesity, notably associated with elevated levels of interleukin-6. Clinical trials on tocilizumab, an anti-interleukin antibody, are ongoing for obesity-related asthma. This armamentarium of therapies is distinct from standard asthma medications, and once investigated for its efficacy and safety among children, will serve as a novel therapeutic intervention for pediatric obesity-related asthma. Irrespective of the directionality of the association between asthma and obesity, airway-specific mechanistic studies are needed to identify additional novel therapeutic targets for obesity-related asthma.

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Authors and Affiliations

  1. Division of Pediatric Pulmonary and Sleep Medicine, Children’s National Hospital, George Washington University, 111 Michigan Ave NW, Washington, DC, 20010, USA

    Silvia Cabrera Guerrero & Deepa Rastogi

  2. Rutgers Institute for Translational Medicine and Science, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA

    Reynold A. Panettieri Jr.

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Guerrero, S.C., Panettieri, R.A. & Rastogi, D. Mechanistic Links Between Obesity and Airway Pathobiology Inform Therapies for Obesity-Related Asthma. Pediatr Drugs 25, 283–299 (2023). https://doi.org/10.1007/s40272-022-00554-7

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