Journal of veterinary internal medicine · 2023
Severe asthma in horses is associated with increased airway innervation.
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Leduc Laurence, Leclère Mathilde, Gauthier Laurie Girardot, Marcil Olivier, Lavoie Jean-Pierre
Аннотация
BACKGROUND: Altered innervation structure and function contribute to airway hyperresponsiveness in human asthma, yet the role of innervation in airflow limitation in asthma in horses remains unknown.
HYPOTHESIS: To characterize peribronchial innervation in horses with asthma. We hypothesized that airway innervation increases in horses with asthma compared with controls.
ANIMALS: Formalin-fixed lung samples from 8 horses with severe asthma and 8 healthy horses from the Equine Respiratory Tissue Biobank. Ante-mortem lung function was recorded.
METHODS: Blinded case-control study. Immunohistochemistry was performed using rabbit anti-s100 antibody as a neuronal marker for myelinating and non-myelinating Schwann cells. The number and cumulative area of nerves in the peribronchial region and associated with airway smooth muscle were recorded using histomorphometry and corrected for airway size.
RESULTS: Both the number (median [IQR]: 1.87 × 10-5 nerves/μm2 [1.28 × 10-5 ]) and the cumulative nerve area (CNA; 1.03 × 10-3 CNA/μm2 [1.57 × 10-3 ]) were higher in the peribronchial region of horses with asthma compared with controls (5.17 × 10-6 nerves/μm2 [3.76 × 10-6 ], 4.14 × 10-4 CNA/μm2 [2.54 × 10-4 ], Mann-Whitney, P = .01). The number of nerves within or lining airway smooth muscle was significantly higher in horses with asthma (4.47 × 10-6 nerves/μm2 [5.75 × 10-6 ]) compared with controls (2.26 × 10-6 nerves/μm2 [1.16 × 10-6 ], Mann-Whitney, P = .03).
CONCLUSIONS AND CLINICAL IMPORTANCE: Asthma in horses is associated with greater airway innervation, possibly contributing to airway smooth muscle remodeling and exacerbating severity of the disease.
HYPOTHESIS: To characterize peribronchial innervation in horses with asthma. We hypothesized that airway innervation increases in horses with asthma compared with controls.
ANIMALS: Formalin-fixed lung samples from 8 horses with severe asthma and 8 healthy horses from the Equine Respiratory Tissue Biobank. Ante-mortem lung function was recorded.
METHODS: Blinded case-control study. Immunohistochemistry was performed using rabbit anti-s100 antibody as a neuronal marker for myelinating and non-myelinating Schwann cells. The number and cumulative area of nerves in the peribronchial region and associated with airway smooth muscle were recorded using histomorphometry and corrected for airway size.
RESULTS: Both the number (median [IQR]: 1.87 × 10-5 nerves/μm2 [1.28 × 10-5 ]) and the cumulative nerve area (CNA; 1.03 × 10-3 CNA/μm2 [1.57 × 10-3 ]) were higher in the peribronchial region of horses with asthma compared with controls (5.17 × 10-6 nerves/μm2 [3.76 × 10-6 ], 4.14 × 10-4 CNA/μm2 [2.54 × 10-4 ], Mann-Whitney, P = .01). The number of nerves within or lining airway smooth muscle was significantly higher in horses with asthma (4.47 × 10-6 nerves/μm2 [5.75 × 10-6 ]) compared with controls (2.26 × 10-6 nerves/μm2 [1.16 × 10-6 ], Mann-Whitney, P = .03).
CONCLUSIONS AND CLINICAL IMPORTANCE: Asthma in horses is associated with greater airway innervation, possibly contributing to airway smooth muscle remodeling and exacerbating severity of the disease.