The effect of CpG-oligodeoxynucleotides with different backbone structures and 3' hexameric deoxyriboguanosine run conjugation on the treatment of asthma in mice.
CpG-Oligodeoxynucleotide (ODN) has two backbones. Phosphorothioate backbone (PS) shows a strong immunostimulating effect while phosphodiester (PE) shows little in vivo. 3' hexameric deoxyriboguanosine-run (3' dG(6)-run) conjugation to PE CpG-ODN has been reported to enhance immunostimulation and to protect against asthma when injected at the time of sensitization in mice. We evaluated the treatment effects of PE and PS CpG-ODN with or without 3' dG(6)-run on asthma in presensitized mice. BALB/c mice sensitized with ovalbumin and alum were challenged with 1% ovalbumin on three days. CpG-ODNs (100 microg) or PBS were injected 4 times; 27 hr before challenge and 3 hr before each challenge (CpG-dG(6): CpG-ODN with 3' dG(6)-run, PE*-CpG-dG(6): PE-CpG-dG(6) with two PS backbones at the 5' terminus). PE-CpG showed no treatment effect. PE-CpG-dG(6) only increased ovalbumin-specific IgG2a. PE*-CpG-dG(6) increased ovalbumin-specific IgG2a but also reduced BAL fluid eosinophils and airway hyperresponsiveness. PS-CpG increased ovalbumin-specific IgG2a, reduced airway inflammation and airway hyperresponsiveness. PS-CpG-dG(6) was less effective than PS-CpG on airway inflammation and airway hyperresponsiveness. In pre-sensitized mice, PE-CpG required not only 3' dG(6)-run but also the modification of two PS linkages at 5' terminus to inhibit features of asthma. PS-CpG was strong enough to inhibit asthma but PS-CpG-dG(6) was less effective.
Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
Yoon-Seok
YS
Chang
Yoon-Keun
YK
Kim
Hyouk-Soo
HS
Kwon
Heung-Woo
HW
Park
Kyung-Up
KU
Min
You-Young
YY
Kim
Sang-Heon
SH
Cho
D000818:Animals; D018927:Anti-Asthmatic Agents / Q000627:therapeutic use*; D001249:Asthma / Q000188:drug therapy* / Q000503:physiopathology; D016535:Bronchial Hyperreactivity / Q000188:drug therapy; D001992:Bronchoalveolar Lavage Fluid / Q000276:immunology; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000737:chemistry*; D005260:Female; D007074:Immunoglobulin G / Q000378:metabolism; D018664:Interleukin-12 / Q000032:analysis; D015847:Interleukin-4 / Q000032:analysis; D015848:Interleukin-5 / Q000032:analysis; D008168:Lung / Q000473:pathology; D051379:Mice; D008807:Mice, Inbred BALB C; D009838:Oligodeoxyribonucleotides / Q000627:therapeutic use*; D054735:Phosphorothioate Oligonucleotides / Q000627:therapeutic use; D013163:Splenomegaly / Q000473:pathology
D018927:Anti-Asthmatic Agents; C408982:CPG-oligonucleotide; D007074:Immunoglobulin G; D015848:Interleukin-5; D009838:Oligodeoxyribonucleotides; D054735:Phosphorothioate Oligonucleotides; D018664:Interleukin-12; D015847:Interleukin-4; D003849:Deoxyguanosine