1
|
Deveci G, Kamil M, Aly ASI. A single dose of genetically-attenuated malaria blood-stage parasites protects against two Plasmodium species infections. Vaccine 2023; 41:1281-5. [PMID: 36653222 DOI: 10.1016/j.vaccine.2023.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 10/31/2022] [Accepted: 01/03/2023] [Indexed: 01/18/2023]
Abstract
Genetically-growth-attenuated blood-stage parasites were generated inPlasmodium falciparumby targeted deletion of NT1 (Nucleoside Transporter-1) gene, and Pfnt1(-) parasites only grew after providing the culture with supra-physiological concentrations of purines. Genetically-attenuatedP. yoeliint1(-)parasites induced sterile-protection against homologous blood-stage infectious challenge after immunization with single subpatent doses, which remained subpatent even in immune-compromised mice. Here, we showed that immunizations with frozen-stocks of equally-mixedP. bergheiandP. yoelii nt1(-)parasites in single subcutaneous doses, which did not lead to patent blood-stage infection, conferred sterile protection against intravenous infectious blood-stage challenge with wild-type parasites ofP. bergheiANKA andP. yoelii17X-NL strains. This data highlights the possibility that a single subcutaneous sub-patent dose of two species of genetically-growth-attenuated parasites, which can protect humans against twoPlasmodiumspp. infections, could be developed in cultures provided with supra-physiological concentrations of purines, and shipped to endemic areas as frozen-stock doses.
Collapse
|
2
|
Nagaoka H, Kanoi BN, Morita M, Nakata T, Palacpac NMQ, Egwang TG, Horii T, Tsuboi T, Takashima E. Characterization of a Plasmodium falciparum PHISTc protein, PF3D7_0801000, in blood- stage malaria parasites. Parasitol Int 2020; 80:102240. [PMID: 33147497 DOI: 10.1016/j.parint.2020.102240] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 09/02/2020] [Accepted: 10/22/2020] [Indexed: 10/23/2022]
Abstract
During intraerythrocytic development Plasmodium falciparum deploys numerous proteins to support erythrocyte invasion, intracellular growth and development, as well as host immune evasion. Since these proteins are key for parasite intraerythrocytic survival and propagation, they represent attractive targets for antimalarial vaccines. In this study we sought to characterize a member of the PHISTc family of proteins, PF3D7_0801000, as a potential vaccine target. Using the wheat germ cell-free system we expressed the N-terminal region of PF3D7_0801000 (G93-L494, PF3D7_0801000N) and generated specific immune sera. We observed that PF3D7_0801000 localizes in merozoites, and antibodies against PF3D7_0801000N modestly inhibit P. falciparum parasite growth in in vitro culture. Sliding window analysis of the coding sequence revealed that pf3d7_0801000n is relatively conserved among African parasite isolates. Antibody profiles in a malaria-exposed Ugandan population revealed that PF3D7_0801000N is strongly immunoreactive with antibody acquisition increasing with age. Taken together, these findings suggest the need for further evaluation of PF3D7_0801000 for its role in merozoite invasion and utility as an asexual blood-stage vaccine candidate antigen.
Collapse
Affiliation(s)
- Hikaru Nagaoka
- Division of Malaria Research, Proteo-Science Center, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
| | - Bernard N Kanoi
- Division of Malaria Research, Proteo-Science Center, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
| | - Masayuki Morita
- Division of Malaria Research, Proteo-Science Center, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
| | - Takahiro Nakata
- Division of Malaria Research, Proteo-Science Center, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
| | - Nirianne M Q Palacpac
- Department of Malaria Vaccine Development, Research Institute for Microbial Diseases, Osaka University, Suita 565-0871, Japan
| | | | - Toshihiro Horii
- Department of Malaria Vaccine Development, Research Institute for Microbial Diseases, Osaka University, Suita 565-0871, Japan
| | - Takafumi Tsuboi
- Division of Malaria Research, Proteo-Science Center, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
| | - Eizo Takashima
- Division of Malaria Research, Proteo-Science Center, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan.
| |
Collapse
|
3
|
Tohmoto T, Takashima E, Takeo S, Morita M, Nagaoka H, Udomsangpetch R, Sattabongkot J, Ishino T, Torii M, Tsuboi T. Anti-MSP11 IgG inhibits Plasmodium falciparum merozoite invasion into erythrocytes in vitro. Parasitol Int 2018; 69:25-29. [PMID: 30385417 DOI: 10.1016/j.parint.2018.10.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [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: 07/23/2018] [Revised: 10/18/2018] [Accepted: 10/29/2018] [Indexed: 11/19/2022]
Abstract
Merozoite surface proteins (MSPs) are considered as promising blood-stage malaria vaccine candidates. MSP3 has long been evaluated for its vaccine candidacy, however, the candidacy of other members of MSP3 family is insufficiently characterized. Here, we investigated Plasmodium falciparum MSP11 (PF3D7_1036000), a member of the MSP3 family, for its potential as a blood-stage vaccine candidate. The full-length protein (MSP11-FL) as well as the N-terminal half-MSP11 (MSP11-N), known to be unique among the MSP3 family members, were expressed by wheat germ cell-free system, and used to raise antibodies in rabbit. Immunoblot analysis of schizont lysates probed with anti-MSP11-N antibodies detected double bands at approximately 40 and 60 kDa, consistent with the previous report thus confirming antibodies specificity. However, inconsistent with previously reported merozoite's surface localization, immunofluorescence assay (IFA) revealed that MSP11 likely localizes to rhoptry neck of merozoites in mature schizonts. After invasion, MSP11 localized to parasitophorous vacuole and thereafter in Maurer's clefts in trophozoites. Anti-MSP11-FL antibody levels were significantly higher in asymptomatic than symptomatic P. falciparum cases in malaria low endemic Thailand. This reconfirmed that anti-MSP11 antibodies play an important role in protection against clinical malaria, as previously reported. Furthermore, in vitro growth inhibition assay revealed that anti-MSP11-FL rabbit antibodies biologically function by inhibiting merozoite invasion of erythrocytes. These findings further support the vaccine candidacy of MSP11.
Collapse
Affiliation(s)
- Tatsuhiro Tohmoto
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
| | - Eizo Takashima
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan.
| | - Satoru Takeo
- Division of Tropical Diseases and Parasitology, Department of Infectious Diseases, Faculty of Medicine, Kyorin University, Mitaka, Tokyo 181-8611, Japan
| | - Masayuki Morita
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
| | - Hikaru Nagaoka
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
| | - Rachanee Udomsangpetch
- Center for Research and Innovation, Faculty of Medical Technology, Mahidol University, Salaya, Nakhosn Pathom 73170, Thailand
| | - Jetsumon Sattabongkot
- Mahidol Vivax Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand
| | - Tomoko Ishino
- Division of Molecular Parasitology, Proteo-Science Center, Ehime University, Shitsukawa, Toon, Ehime 791-0295, Japan
| | - Motomi Torii
- Division of Molecular Parasitology, Proteo-Science Center, Ehime University, Shitsukawa, Toon, Ehime 791-0295, Japan
| | - Takafumi Tsuboi
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan.
| |
Collapse
|
4
|
Ito D, Takashima E, Yamasaki T, Hatano S, Hasegawa T, Miura K, Morita M, Thongkukiatkul A, Diakite M, Long CA, Sattabongkot J, Udomsangpetch R, Iriko H, Ishino T, Tsuboi T. Antibodies against a Plasmodium falciparum RON12 inhibit merozoite invasion into erythrocytes. Parasitol Int 2018; 68:87-91. [PMID: 30342119 DOI: 10.1016/j.parint.2018.10.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 10/10/2018] [Accepted: 10/16/2018] [Indexed: 10/28/2022]
Abstract
Proteins coating Plasmodium merozoite surface and secreted from its apical organelles are considered as promising vaccine candidates for blood-stage malaria. The rhoptry neck protein 12 of Plasmodium falciparum (PfRON12) was recently reported as a protein specifically expressed in schizonts and localized to the rhoptry neck of merozoites. Here, we assessed its potential as a vaccine candidate. We expressed a recombinant PfRON12 protein by a wheat germ cell-free system to obtain anti-PfRON12 antibody. Immunoblot analysis of schizont lysates detected a single band at approximately 40 kDa under reducing conditions, consistent with the predicted molecular weight. Additionally, anti-PfRON12 antibody recognized a single band around 80 kDa under non-reducing conditions, suggesting native PfRON12 forms a disulfide-bond-mediated multimer. Immunofluorescence assay and immunoelectron microscopy revealed that PfRON12 localized to the rhoptry neck of merozoites in schizonts and to the surface of free merozoites. The biological activity of anti-PfRON12 antibody was tested by in vitro growth inhibition assay (GIA), and the rabbit antibodies significantly inhibited merozoite invasion of erythrocytes. We then investigated whether PfRON12 is immunogenic in P. falciparum-infected individuals. The sera from P. falciparum infected individuals in Thailand and Mali reacted with the recombinant PfRON12. Furthermore, human anti-PfRON12 antibodies affinity-purified from Malian serum samples inhibited merozoite invasion of erythrocytes in vitro. Moreover, pfron12 is highly conserved with only 4 non-synonymous mutations in the coding sequence from approximately 200 isolates deposited in PlasmoDB. These results suggest that PfRON12 might be a potential blood-stage vaccine candidate antigen against P. falciparum.
Collapse
Affiliation(s)
- Daisuke Ito
- Division of Medical Zoology, Department of Microbiology and Immunology, Faculty of Medicine, Tottori University, 86 Nishi-cho, Yonago, Tottori 683-8503, Japan
| | - Eizo Takashima
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan.
| | - Tsutomu Yamasaki
- Department of Molecular and Clinical Diagnosis, School of Pharmacy, Shujitsu University, Okayama 703-8516, Japan
| | - Shinya Hatano
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
| | - Tomoyuki Hasegawa
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
| | - Kazutoyo Miura
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852, United States
| | - Masayuki Morita
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
| | - Amporn Thongkukiatkul
- Department of Biology, Faculty of Science, Burapha University, Chonburi 20131, Thailand
| | - Mahamadou Diakite
- Malaria Research and Training Centre, Faculty of Medicine, Pharmacy and Odonto-stomatology, University of Sciences, Techniques, and Technologies of Bamako, Point G, BP 1805, Mali
| | - Carole A Long
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852, United States
| | - Jetsumon Sattabongkot
- Mahidol Vivax Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand
| | - Rachanee Udomsangpetch
- Center for Research and Innovation, Faculty of Medical Technology, Mahidol University, Salaya, Nakhosn Pathom, 73170, Thailand
| | - Hideyuki Iriko
- Division of Global Infectious Diseases, Department of Public Health, Kobe University Graduate School of Health Sciences, 7-10-2 Tomogaoka, Suma-ku, Kobe, Hyogo 654-0142, Japan
| | - Tomoko Ishino
- Division of Molecular Parasitology, Proteo-Science Center, Ehime University, Toon Ehime, 791-0295, Japan
| | - Takafumi Tsuboi
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan.
| |
Collapse
|
5
|
Sakamoto H, Takeo S, Takashima E, Miura K, Kanoi BN, Kaneko T, Han ET, Tachibana M, Matsuoka K, Sattabongkot J, Udomsangpetch R, Ishino T, Tsuboi T. Identification of target proteins of clinical immunity to Plasmodium falciparum in a region of low malaria transmission. Parasitol Int 2017; 67:203-208. [PMID: 29217416 DOI: 10.1016/j.parint.2017.12.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 11/29/2017] [Accepted: 12/04/2017] [Indexed: 01/03/2023]
Abstract
The target molecules of antibodies against falciparum malaria remain largely unknown. Recently we have identified multiple proteins as targets of immunity against Plasmodium falciparum using African serum samples. To investigate whether potential targets of clinical immunity differ with transmission intensity, we assessed immune responses in residents of low malaria transmission region in Thailand. Malaria asymptomatic volunteers (Asy: n=19) and symptomatic patients (Sym: n=21) were enrolled into the study. Serum immunoreactivity to 186 wheat germ cell-free system (WGCFS)-synthesized recombinant P. falciparum asexual-blood stage proteins were determined by AlphaScreen, and subsequently compared between the study groups. Forty proteins were determined as immunoreactive with antibody responses to 35 proteins being higher in Asy group than in Sym group. Among the 35 proteins, antibodies to MSP3, MSPDBL1, RH2b, and MSP7 were significantly higher in Asy than Sym (unadjusted p<0.005) suggesting these antigens may have a protective role in clinical malaria. MSP3 reactivity remained significantly different between Asy and Sym groups even after multiple comparison adjustments (adjusted p=0.033). Interestingly, while our two preceding studies using African sera were conducted differently (e.g., cross-sectional vs. longitudinal design, observed clinical manifestation vs. functional activity), those studies similarly identified MSP3 and MSPDBL1 as potential targets of protective immunity. This study further provides a strong rationale for the application of WGCFS-based immunoprofiling to malaria vaccine candidate and biomarker discovery even in low or reduced malaria transmission settings.
Collapse
Affiliation(s)
- Hirokazu Sakamoto
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
| | - Satoru Takeo
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
| | - Eizo Takashima
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
| | - Kazutoyo Miura
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852, USA
| | - Bernard N Kanoi
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
| | - Takamasa Kaneko
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
| | - Eun-Taek Han
- Department of Medical Environmental Biology and Tropical Medicine, Kangwon National University School of Medicine, Chuncheon, Gangwon-do 200-701, Republic of Korea
| | - Mayumi Tachibana
- Division of Molecular Parasitology, Proteo-Science Center, Ehime University, Toon, Ehime 791-0295, Japan
| | - Kazuhiro Matsuoka
- Division of Molecular Parasitology, Proteo-Science Center, Ehime University, Toon, Ehime 791-0295, Japan
| | - Jetsumon Sattabongkot
- Department of Entomology, Armed Forces Research Institute of Medical Sciences, Bangkok 10400, Thailand
| | - Rachanee Udomsangpetch
- Center for Research and Innovation, Faculty of Medical Technology, Mahidol University, Salaya, Nakhosn Pathom 73170, Thailand
| | - Tomoko Ishino
- Division of Molecular Parasitology, Proteo-Science Center, Ehime University, Toon, Ehime 791-0295, Japan
| | - Takafumi Tsuboi
- Division of Malaria Research, Proteo-Science Center, Ehime University, Matsuyama, Ehime 790-8577, Japan.
| |
Collapse
|
6
|
Abstract
Having the ability to rapidly, accurately, and robustly measure Plasmodium falciparum merozoite invasion is a critical component in effective assessment of a blood stage vaccine's mechanism of action. Being able to measure invasion of erythrocytes accurately, objectively and in a high throughput fashion is of critical importance. Here, we describe a simple and robust flow cytometry method that allows for the measurement of the key invasion parameters of parasite multiplication rate and erythrocyte selectivity-both important determinants of disease severity-from the schizont to the ring stage of the parasite's life-cycle, thus separating invasion from growth of the parasite. Importantly, this method is able to accurately detect low levels of parasitemia and heterogeneity within the population that can be missed by enzymatic methods. Lastly, this method has been successfully adapted and employed in field based research settings for parasitemia measurements in vivo, ex vivo, and in vitro and to measure invasion inhibition by antibodies and the use of alternative pathways for invasion.
Collapse
Affiliation(s)
- Amy Kristine Bei
- Harvard T. H. Chan School of Public Health, 665 Huntington Avenue, Building 1, RM 704, Boston, MA, 02115, USA.
| | - Manoj T Duraisingh
- Harvard T. H. Chan School of Public Health, 665 Huntington Avenue, FXB, RM 205, Boston, MA, 02115, USA
| |
Collapse
|