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Cheng Y, Shen R, Liu F, Li Y, Wang J, Hou Y, Liu Y, Zhou H, Hou F, Wang Y, Li X, Qiao R, Luo S. Humoral and cellular immune responses induced by serogroup W135 meningococcal conjugate and polysaccharide vaccines. Vaccine 2024; 42:2781-2792. [PMID: 38508928 DOI: 10.1016/j.vaccine.2024.03.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 02/15/2024] [Accepted: 03/15/2024] [Indexed: 03/22/2024]
Abstract
Investigating the mechanisms by which W135 meningococcal conjugate (PSW135-TT) activates adaptive immune responses in mice can provide a comprehensive understanding of the immune mechanisms of bacterial polysaccharide conjugate vaccines. We compared B-cell and T-cell immune responses immunized with W135 meningococcal capsular polysaccharides (PSW135), tetanus toxoid (TT) and PSW135-TT in mice. The results showed that PSW135-TT could induce higher PSW135-specific and TT-specific IgG antibodies with a significant enhancement after two doses. All serum antibodies immunized with PSW135- TT had strong bactericidal activity, whereas none of the serum antibodies immunized with PSW135 had bactericidal activity. Besides, IgM and IgG antibodies immunized with PSW135-TT after two doses were positively correlated with the titer of bactericidal antibodies. We also found Th cells favored Th2 humoral immune responses in PSW135-TT, PSW135, and TT-immunized mice, especially peripheral blood lymphocytes. Furthermore, PSW135-TT and TT could effectively activate bone marrow derived dendritic cells (BMDCs) and promote BMDCs to highly express major histocompatibility complex Ⅱ (MHCⅡ), CD86 and CD40 molecules in mice, whereas PSW135 couldn't. These data verified the typical characteristics of PSW135-TT and TT as T cell dependent antigen (TD-Ag) and PSW135 as T cell independent antigen (TI-Ag), which will be very helpful for further exploration of the immune mechanism of polysaccharide-protein conjugate vaccines and improvement of the quality of bacterial polysaccharide conjugate vaccines in future.
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Affiliation(s)
- Yahui Cheng
- Lanzhou Institute of Biological Products Co., Ltd., Lanzhou 730046, China
| | - Rong Shen
- Lanzhou Institute of Biological Products Co., Ltd., Lanzhou 730046, China
| | - Fanglei Liu
- Lanzhou Institute of Biological Products Co., Ltd., Lanzhou 730046, China
| | - Yanting Li
- Lanzhou Institute of Biological Products Co., Ltd., Lanzhou 730046, China
| | - Jing Wang
- Lanzhou Institute of Biological Products Co., Ltd., Lanzhou 730046, China
| | - Yali Hou
- Lanzhou Institute of Biological Products Co., Ltd., Lanzhou 730046, China
| | - Yueping Liu
- Lanzhou Institute of Biological Products Co., Ltd., Lanzhou 730046, China
| | - Haifei Zhou
- Lanzhou Institute of Biological Products Co., Ltd., Lanzhou 730046, China
| | - Fengping Hou
- Lanzhou Institute of Biological Products Co., Ltd., Lanzhou 730046, China
| | - Yunjin Wang
- Lanzhou Institute of Biological Products Co., Ltd., Lanzhou 730046, China
| | - Xiongxiong Li
- Lanzhou Institute of Biological Products Co., Ltd., Lanzhou 730046, China
| | - Ruijie Qiao
- Lanzhou Institute of Biological Products Co., Ltd., Lanzhou 730046, China.
| | - Shuquan Luo
- Lanzhou Institute of Biological Products Co., Ltd., Lanzhou 730046, China.
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