title: Alleviation of lung inflammatory responses by adeno-associated virus 2/9 vector carrying CC10 in OVA-sensitized mice.
abstract: Asthma is a chronic airway inflammatory disease characterized by eosinophilic infiltration and airway hyperresponsiveness. The over-activated Th2 and lung epithelium cells express many different cytokines, and chemokines mainly contribute to the severity of lung inflammation. Clara cell 10 kD protein (CC10) is highly expressed in airway epithelium cells and exhibits anti-inflammatory and immunomodulatory effects. Adeno-associated virus (AAV) 2/9 vector, composed of AAV2 rep and AAV9 cap genes, can efficiently and specifically target lung epithelium cells. Thus, AAV2/9 vector might carry therapeutic potential gene sequences for the treatment of asthma. This study tested whether AAV2/9 vector carrying CC10 could reduce inflammatory and asthmatic responses in OVA-induced asthmatic mouse model. The results showed that AAV2/9-CC10 vector virus significantly reduced airway hyperresponsiveness, CCL11, interleukin (IL)-4, IL-5, IL-6, IL-13, and eosinophilia in the lungs of sensitized mice. CC10 level in OVA-sensitized mice was rescued with the administration of AAV2/9-CC10 vector virus. Lung tissue remodeling, including collagen deposition and goblet cell hyperplasia, was also alleviated. However, serum levels of OVA-specific IgG1 and IgE as well as Th2 cytokine levels in OVA-stimulated splenocyte culture supernatants were at the comparable levels to the sensitized control group. The results demonstrate that AAV2/9-CC10 vector virus relieved local inflammatory and asthmatic responses in lung. Therefore, we propose that AAV2/9-CC10 vector virus guaranteed sufficient CC10 expression and had an anti-inflammatory effect in asthmatic mice. It might be applied as a novel therapeutic approach for asthma.
authors.affiliation: Graduate Institute of Biomedical Sciences, Chang Gung University, Taoyuan 333, Taiwan.
authors.forename: Chia-Jen
authors.initials: CJ
authors.lastname: Wu
authors.forename: Li-Chen
authors.initials: LC
authors.lastname: Chen
authors.forename: Wen-Chung
authors.initials: WC
authors.lastname: Huang
authors.forename: Chang-Lin
authors.initials: CL
authors.lastname: Chuang
authors.forename: Ming-Ling
authors.initials: ML
authors.lastname: Kuo
mesh_terms: D000818:Animals; D001249:Asthma / Q000139:chemically induced / Q000503:physiopathology* / Q000628:therapy*; D016535:Bronchial Hyperreactivity / Q000628:therapy; D001992:Bronchoalveolar Lavage Fluid / Q000737:chemistry; D017931:DNA Primers / Q000235:genetics; D000229:Dependovirus; D015316:Genetic Therapy / Q000379:methods*; D005822:Genetic Vectors / Q000627:therapeutic use*; D007073:Immunoglobulin E / Q000097:blood; D007074:Immunoglobulin G / Q000097:blood; D007150:Immunohistochemistry; D007378:Interleukins / Q000097:blood; D008168:Lung / Q000473:pathology; D051379:Mice; D041681:NIH 3T3 Cells; D010047:Ovalbumin / Q000633:toxicity; D016896:Treatment Outcome; D014598:Uteroglobin / Q000627:therapeutic use*
chemical_list: D017931:DNA Primers; D007074:Immunoglobulin G; D007378:Interleukins; C556390:Scgb1a1 protein, mouse; D007073:Immunoglobulin E; D010047:Ovalbumin; D014598:Uteroglobin