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AND THE ANSWERS ARE . . .

The correct answer is:
A (a decline in sputum eosinophils), B (a decline in circulating eosinophils), and E (A diminution in the deposition of glycoproteins beneath the subepithelial basement membrane.

Comment:
Anti-IgE dramatically reduces both circulating and sputum eosinophils. This occurs both in asthma and in hypereosinophilic syndrome as discussed previously in this column. Despite this effect on eosinophils, anti-IgE has not been shown to improve baseline airway function or produce an amelioration of the late phase reaction in the lung or skin. However, the administration of anti-IL 5 does cause a decrease in the expression of glycoproteins in the subepithelial basement membrane. These include tenascin , lumican, and procollagen 3.

These findings have been interpreted by some to indicate that the eosinophil may be more important in airway remodeling than in the production of symptoms of asthma.

Reference:
Holgate ST. Pathogenesis of asthma. Clinical and Experimental Allergy 2008; 38:872-897.



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