Serotype-Independent Protection Against Invasive Pneumococcal Infections Conferred by Live Vaccine With lgt Deletion
- 주제(키워드) Streptococcus pneumoniae , Lgt , lipoprotein , live attenuated vaccine , mucosal immunity
- 주제(기타) Immunology
- 설명문(일반) [Jang, A-Yeung; Ahn, Ki Bum; Zhi, Yong; Ji, Hyun-Jung; Zhang, Jing; Lim, Sangyong; Seo, Ho Seong] Korea Atom Energy Res Inst, Res Div Biotechnol, Jeongeup, South Korea; [Jang, A-Yeung; Song, Joon Yong] Korea Univ, Dept Internal Med, Coll Med, Seoul, South Korea; [Zhi, Yong; Lim, Sangyong; Seo, Ho Seong] Univ Sci & Technol, Dept Radiat Sci & Technol, Daejeon, South Korea; [Ji, Hyun-Jung; Han, Seung Hyun] Seoul Natl Univ, Sch Dent, Dept Oral Microbiol & Immunol, DRI & BK21 Plus Program, Seoul, South Korea; [Guo, Huichen] Chinese Acad Agr Sci, Lanzhou Vet Res Inst, State Key Lab Vet Etiol Biol, Natl Foot & Mouth Dis Reference Lab, Lanzhou, Gansu, Peoples R China; [Lim, Jae Hyang] Ewha Womans Univ, Dept Microbiol, Coll Med, Seoul, South Korea
- 등재 SCIE, SCOPUS
- OA유형 gold, Green Published
- 발행기관 FRONTIERS MEDIA SA
- 발행년도 2019
- URI http://www.dcollection.net/handler/ewha/000000160247
- 본문언어 영어
- Published As http://dx.doi.org/10.3389/fimmu.2019.01212
- PubMed https://pubmed.ncbi.nlm.nih.gov/31191555
초록/요약
Streptococcus pneumoniae is the most common respiratory bacterial pathogen among cases of community-acquired infection in young children, older adults, and individuals with underlying medical conditions. Although capsular polysaccharide-based pneumococcal vaccines have contributed to significant decrease in invasive pneumococcal infections, these vaccines have some limitations, including limited serotype coverage, lack of effective mucosal antibody responses, and high costs. In this study, we investigated the safety and immunogenicity of a live, whole-cell pneumococcal vaccine constructed by deleting the gene for prolipoprotein diacylglyceryl transferase (lgt) from the encapsulated pneumococcal strain TIGR4 (TIGR4 Delta lgt) for protection against heterologous pneumococcal strains. Pneumococcal strain TIGR4 was successfully attenuated by deletion of lgt, resulting in the loss of inflammatory activity and virulence. TIGR4 Delta lgt colonized the nasopharynx long enough to induce strong mucosal IgA and IgG2b-dominant systemic antibody responses that were cross-reactive to heterologous pneumococcal serotypes. Finally, intranasal immunization with TIGR4 Delta lgt provided serotype-independent protection against pneumococcal challenge in mice. Taken together, our results suggest that TIGR4 Delta lgt is an avirulent and attractive broad-spectrum pneumococcal vaccine candidate. More broadly, we assert that modulation of such "master" metabolic genes represents an emerging strategy for developing more effective vaccines against numerous infectious agents.
more