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Am J Vet Res. 2009 Mar;70(3):365-72. doi: 10.2460/ajvr.70.3.365.

Effects of in vitro exposure to hay dust on the gene expression of chemokines and cell-surface receptors in primary bronchial epithelial cell cultures established from horses with chronic recurrent airway obstruction.

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  • 1Department of Clinical Sciences, Cornell University, Ithaca, NY 14853, USA.



To examine effects of in vitro exposure to solutions of hay dust, lipopolysaccharide (LPS), or beta-glucan on chemokine and cell-surface receptor (CSR) gene expression in primary bronchial epithelial cell cultures (BECCs) established from healthy horses and horses with recurrent airway obstruction (RAO).


BECCs established from bronchial biopsy specimens of 6 RAO-affected horses and 6 healthy horses.


5-day-old BECCs were treated with PBS solution, hay dust solutions, LPS, or beta-glucan for 6 or 24 hours. Gene expression of interleukin (IL)-8, chemokine (C-X-C motif) ligand 2 (CXCL2), IL-1beta, toll-like receptor 2, toll-like receptor 4, IL-1 receptor 1, and glyceraldehyde 3-phosphate dehydrogenase was measured with a kinetic PCR assay.


Treatment with PBS solution for 6 or 24 hours was not associated with a significant difference in chemokine or CSR expression between BECCs from either group of horses. In all BECCs, treatment with hay dust or LPS for 6 hours increased IL-8, CXCL2, and IL-1beta gene expression > 3-fold; at 24 hours, only IL-1beta expression was upregulated by > 3-fold. In all BECCs, CSR gene expression was not increased following any treatment. With the exception of a 3.7-fold upregulation of CXCL2 in BECCs from RAO-affected horses (following 6-hour hay dust treatment), no differences in chemokine or CSR gene expression were detected between the 2 groups. At 24 hours, CXCL2 gene expression in all BECCs was downregulated.


Epithelial CXCL2 upregulation in response to hay dust particulates may incite early airway neutrophilia in horses with RAO.

[PubMed - indexed for MEDLINE]
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