Therapeutic efficacy of an E. coli strain carrying an ovalbumin allergenic peptide as a fused protein to OMPC in a murine model of allergic airway inflammation
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- 作者：Yé ; pez ; Sara Huerta ; Pando ; Rogelio Herná ; ndez ; Argumedo ; Leopoldo Santos ; et. al.
- 关键词：OVA ; ovalbumin ; BAL ; bronchioalveolar lavage ; SS ; saline solution ; i.n. ; intranasal ; i.p. ; intraperitoneal ; i.t. ; intratracheal ; LPS ; lipopolysaccharide ; H/E ; hematoxylin/eosin ; PAS ; periodic acid Schiff ; Pulmonary inflammation ; Bacterial vectors ; Goblet
- 刊名：Vaccine
- 出版年：2003
- 出版时间：January 17, 2003
- 年：2003
- 卷：21
- 期：5-6
- 页码：566-578
- 全文大小：616 K
文摘
An Escherichia coli strain expressing the ovalbumin (OVA) 323–329 allergenic peptide on the bacterial surface was evaluated for its ability to reduce the lung inflammatory response in mice allergic to OVA. BALB/c mice were rendered allergic by means of two intraperitoneal injections of OVA suspended in alum 5 days apart, and one intratracheal boost 1 week later. The mice were then treated with two intranasal, 1 week apart, doses of 4×109 E. coli-UH302 transformed with plasmids pST13 or pST13-OVA323–339, which bear the OmpC porin from Salmonella enterica serovar Typhi or the OmpC with the OVA allergenic 323–339 amino acid sequence inserted in the external loop 5. The allergic inflammatory reaction was evaluated on day 31, finding that mice treated with E. coli-UH302-pST13-OVA reduced four to seven times perivascular and peribronchial infiltrates, mucus production, goblet cell hyperplasia and eosinophils when compared with mice treated with E. coli-UH302-pST13 or saline solution. These results were consistent with a significant decrease of IL-5 mRNA and induction of IFN-γ mRNA in cells from bronchio-alveolar lavages (BAL). Specific serum IgE anti-OVA was also reduced, although the decrease did not reach statistical significance. These results demonstrate that the bacterial live vector bearing an allergenic peptide successfully moderated two important components of allergy, pulmonary inflammation and mucus overproduction.