DNA Prime/Adenovirus Boost Malaria Vaccine Encoding P-falciparum CSP and AMA1 Induces Sterile Protection Associated with Cell-Mediated Immunity

被引：104

作者：

Chuang, Ilin ^{[1
]}

Sedegah, Martha ^{[1
]}

Cicatelli, Susan ^{[2
]}

Spring, Michele ^{[2
]}

Polhemus, Mark ^{[2
]}

Tamminga, Cindy ^{[1
]}

Patterson, Noelle ^{[1
]}

Guerrero, Melanie ^{[2
]}

Bennett, Jason W. ^{[2
]}

McGrath, Shannon ^{[1
]}

Ganeshan, Harini ^{[1
]}

Belmonte, Maria ^{[1
]}

Farooq, Fouzia ^{[1
]}

Abot, Esteban ^{[1
]}

Banania, Jo Glenna ^{[1
]}

Huang, Jun ^{[1
]}

Newcomer, Rhonda ^{[2
]}

Rein, Lisa ^{[2
]}

Litilit, Dianne ^{[1
]}

Richie, Nancy O. ^{[2
]}

Wood, Chloe ^{[2
]}

Murphy, Jittawadee ^{[2
]}

Sauerwein, Robert ^{[3
]}

Hermsen, Cornelus C. ^{[3
]}

McCoy, Andrea J. ^{[1
]}

Kamau, Edwin ^{[2
]}

Cummings, James ^{[2
]}

Komisar, Jack ^{[2
]}

Sutamihardja, Awalludin ^{[1
]}

Shi, Meng ^{[2
]}

Epstein, Judith E. ^{[1
]}

Maiolatesi, Santina ^{[1
]}

Tosh, Donna ^{[2
]}

Limbach, Keith ^{[1
]}

Angov, Evelina ^{[2
]}

Bergmann-Leitner, Elke ^{[2
]}

Bruder, Joseph T. ^{[4
]}

Doolan, Denise L. ^{[1
]}

King, C. Richter ^{[4
]}

Carucci, Daniel ^{[1
]}

Dutta, Sheetij ^{[2
]}

Soisson, Lorraine ^{[5
]}

Diggs, Carter ^{[5
]}

Hollingdale, Michael R. ^{[1
]}

Ockenhouse, Christian F. ^{[2
]}

Richie, Thomas L. ^{[1
]}

机构：

[1] USN, US Mil Malaria Vaccine Program, Med Res Ctr, Silver Spring, MD USA

[2] Walter Reed Army Inst Res, US Mil Malaria Vaccine Program, Silver Spring, MD USA

[3] Radboud Univ Nijmegen, Med Ctr, NL-6525 ED Nijmegen, Netherlands

[4] GenVec Inc, Gaithersburg, MD USA

[5] USAID, Washington, DC USA

来源：

PLOS ONE | 2013年 / 8卷 / 02期

关键词：

APICAL MEMBRANE ANTIGEN-1; CYTOTOXIC T-LYMPHOCYTES; PHASE 2A TRIAL; NAIVE ADULTS; CIRCUMSPOROZOITE PROTEIN; NEUTRALIZING ANTIBODIES; DOUBLE-BLIND; IMMUNIZATION; INDUCTION; RESPONSES;

D O I：

10.1371/journal.pone.0055571

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

070301 [无机化学]; 070403 [天体物理学]; 070507 [自然资源与国土空间规划学]; 090105 [作物生产系统与生态工程];

摘要：

Background: Gene-based vaccination using prime/boost regimens protects animals and humans against malaria, inducing cell-mediated responses that in animal models target liver stage malaria parasites. We tested a DNA prime/adenovirus boost malaria vaccine in a Phase 1 clinical trial with controlled human malaria infection. Methodology/Principal Findings: The vaccine regimen was three monthly doses of two DNA plasmids (DNA) followed four months later by a single boost with two non-replicating human serotype 5 adenovirus vectors (Ad). The constructs encoded genes expressing P. falciparum circumsporozoite protein (CSP) and apical membrane antigen-1 (AMA1). The regimen was safe and well-tolerated, with mostly mild adverse events that occurred at the site of injection. Only one AE (diarrhea), possibly related to immunization, was severe (Grade 3), preventing daily activities. Four weeks after the Ad boost, 15 study subjects were challenged with P. falciparum sporozoites by mosquito bite, and four (27%) were sterilely protected. Antibody responses by ELISA rose after Ad boost but were low (CSP geometric mean titer 210, range 44-817; AMA1 geometric mean micrograms/milliliter 11.9, range 1.5-102) and were not associated with protection. Ex vivo IFN-gamma ELISpot responses after Ad boost were modest (CSP geometric mean spot forming cells/million peripheral blood mononuclear cells 86, range 13-408; AMA1 348, range 88-1270) and were highest in three protected subjects. ELISpot responses to AMA1 were significantly associated with protection (p = 0.019). Flow cytometry identified predominant IFN-gamma mono-secreting CD8+ T cell responses in three protected subjects. No subjects with high pre-existing anti-Ad5 neutralizing antibodies were protected but the association was not statistically significant. Significance: The DNA/Ad regimen provided the highest sterile immunity achieved against malaria following immunization with a gene-based subunit vaccine (27%). Protection was associated with cell-mediated immunity to AMA1, with CSP probably contributing. Substituting a low seroprevalence vector for Ad5 and supplementing CSP/AMA1 with additional antigens may improve protection.

引用

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