Abstract:
:The frequent outbreak of respiratory infectious diseases such as influenza and pulmonary tuberculosis calls for new immunization strategies with high effectiveness. Nasal immunization is one of the most potential methods to prevent the diseases infected through the respiratory tract. In this study, we designed a water-soluble system based on antigen/N-trimethylaminoethylmethacrylate chitosan conjugates for nasal immunization. N-trimethylaminoethylmethacrylate chitosan (TMC) was synthesized by free radical polymerization of chitosan and N-trimethylaminoethylmethacrylate chloride and identified by (1)H NMR and FT-IR. Thiolated ovalbumin (OVA) was covalently conjugated to maleimide modified TMC with high conjugation efficiency. OVA conjugated TMC (OVA-TMC) significantly increased uptake of OVA by Raw 264.7 cells, which was 2.38 times higher than that of OVA/TMC physical mixture (OVA+TMC) at 4h. After nasal administration, OVA-TMC showed higher transport efficiency to superficial and deep cervical lymph nodes than OVA+TMC or OVA alone. Balb/C mice were intranasally given with OVA-TMC three times at 2-week internals to evaluate the immunological effect. The serum IgG, IgG1 and IgG2a levels of the OVA-TMC group were 17.9-87.9 times higher than that of the OVA+TMC group and comparable to that of the intramuscular group. The secretory IgA levels in nasal wash and saliva of the OVA-TMC group were 5.2-7.1 times higher than that of the OVA+TMC group while the secretory IgA levels of the intramuscular alum-precipitated OVA group were not increased. After immunofluorescence staining of nasal cavity, IgA antibody secreting cells were mainly observed in the lamina propria regions and glands of nasal mucosa. OVA-TMC showed little toxicity to the nasal epithelia or cilia of rats after nasal administration for three consecutive days. These results demonstrated that antigen conjugated TMC can induce both systemic and mucosal immune responses after nasal administration and may serve as a convenient, safe and effective vaccine for preventing respiratory infectious diseases.
journal_name
Vaccinejournal_title
Vaccineauthors
Liu Q,Zhang C,Zheng X,Shao X,Zhang X,Zhang Q,Jiang Xdoi
10.1016/j.vaccine.2014.03.041subject
Has Abstractpub_date
2014-05-07 00:00:00pages
2582-90issue
22eissn
0264-410Xissn
1873-2518pii
S0264-410X(14)00410-1journal_volume
32pub_type
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