title: [Experimental study on the impact of urban inhalable particles on allergic rhinitis of rats].
abstract: OBJECTIVE
  In order to study the effect of inhalable particles on provocation of rat allergic rhinitis model and its possible mechanism.
  
  
  METHODS
  After basic sensitizing the experimental rats with OVA by intraperitoneal injection, three groups were provocated by solo OVA, PM10+OVA and solo PM10 through nasal cavity respectively. The control group was sensitized by NS instead of OVA, and then provocated by NS as the method of experimental groups. The symptoms of rat during the provocation were observed and recorded. Then, the rats were sacrificed 24 hours after the last provocation, and the expression of IL-4 in nasal mucosa were detected by immunohistochemical method.
  
  
  RESULTS
  The groups of OVA and PM10+OVA both had provocated the obvious symptoms of allergic rhinitis, while the groups of PM10 and NS had the symptoms of scratching nose occasionally. By statistical analysis of the amount of IL-4 positive cells, there were significant differences between each experimental group and NS group, and there was significant difference between three experimental groups. The amount of IL-4 positive cells in PM10+OVA group was obviously higher than that in other groups.
  
  
  CONCLUSIONS
  In the period of provocation the rat allergic rhinitis, the inhalable particles play a synergic role with allergen, and it can aggravate the symptoms of allergic rhinitis.
authors.affiliation: Department of Otorhinolaryngology, Peking University People's Hospital, Beijing 100044, China. Xing-zhimin@tom.com
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Xing
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Liu
authors.forename: Lisheng
authors.initials: L
authors.lastname: Yu
authors.forename: Min
authors.initials: M
authors.lastname: Wang
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000818:Animals; D004195:Disease Models, Animal; D015994:Incidence; D008297:Male; D052638:Particulate Matter; D051381:Rats; D017207:Rats, Sprague-Dawley; D012221:Rhinitis, Allergic, Perennial / Q000453:epidemiology*
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter