High levels of IgG3 anti ICB2-5 in Plasmodium vivax-infected individuals who did not develop symptoms
- Fernanda G Versiani†1, 2,
- Maria EM Almeida†1,
- Gisely C Melo3, 4,
- Francivaldo OL Versiani2,
- Patrícia P Orlandi1, 2,
- Luís André M Mariúba1,
- Leidiane A Soares1,
- Luciana P Souza1,
- Antonio A da Silva Balieiro1,
- Wuelton M Monteiro2, 3, 4,
- Fabio TM Costa5,
- Hernando A del Portillo6,
- Marcus VG Lacerda2 and
- Paulo A Nogueira1, 2Email author
© Versiani et al.; licensee BioMed Central Ltd. 2013
Received: 16 April 2013
Accepted: 19 August 2013
Published: 27 August 2013
Plasmodium vivax has the potential to infect 2.85 billion individuals worldwide. Nevertheless, the limited number of studies investigating the immune status of individuals living in malaria-endemic areas, as well as the lack of reports investigating serological markers associated with clinical protection, has hampered development of vaccines for P. vivax. It was previously demonstrated that naturally total IgG against the N-terminus of P. vivax merozoite surface protein 1 (Pv-MSP1) was associated with reduced risk of malarial infection.
Immune response against Pv-MSP1 (N-terminus) of 313 residents of the Rio Pardo rural settlement (Amazonas State, Brazil) was evaluated in a cross-sectional and longitudinal follow up over two months (on site) wherein gold standard diagnosis by thick blood smear and rRNA gene-based nested real-time PCR were used to discriminate symptomless Plasmodium vivax-infected individuals who did not develop clinical symptoms during a 2-months from those uninfected ones or who have had acute malaria. The acquisition of antibodies against Pv-MSP1 was also evaluated as survival analysis by prospective study over a year collecting information of new malaria infections in surveillance database.
The majority of P. vivax-infected individuals (52-67%) showed immune recognition of the N-terminus of Pv-MSP1. Interesting data on infected individuals who have not developed symptoms, total IgG levels against the N-terminus Pv-MSP1 were age-dependent and the IgG3 levels were significantly higher than levels of subjects had acute malaria or those uninfected ones. The total IgG anti ICB2-5 was detected to be an important factor of protection against new malaria vivax attacks in survival analysis in a prospective survey (p = 0.029).
The study findings illustrate the importance of IgG3 associated to 2-months of symptomless in P. vivax infected individuals and open perspectives for the rationale of malaria vaccine designs capable to sustain high levels of IgG3 against polymorphic malaria antigens.
KeywordsMalaria Plasmodium vivax Merozoite surface protein-1 Clinical protection IgG3
Plasmodium vivax is the most widespread species of human malaria parasite, and risk of P. vivax infection is higher compared to Plasmodium falciparum[1, 2]. In Brazil, 99.8% of malaria cases are concentrated in the Amazon region with P. vivax being the most prevalent species (ca 85%) . Although P. vivax is currently associated with non-life-threatening malarial infection, recent studies have reported similar complications and pathogenic mechanisms frequently observed in malaria caused by P. falciparum[4–6]. Drug resistance to commonly used anti-malarial drugs has also been reported worldwide [4, 7–16] challenging the current view of P. vivax as a less harmful parasite and raising the need for developing an effective vaccine.
In hopes of reducing malaria morbidity and mortality, Plasmodium merozoite antigens have been proposed as targets for vaccine design . Amongst this family of molecules, merozoite surface protein-1 (MSP1) is a 195-kDa glycoprotein abundant on the surface of merozoites and essential for merozoite development due to its involvement in erythrocyte invasion . MSP1 attaches to the parasite membrane by a GPI anchor and associates with other merozoite molecules (e g, MSP6 and MSP7), forming a multicomplex protein . MSP1 displays a highly polymorphic N-terminus, yet a conserved C-terminus region [17, 19, 20]. The Pvmsp1 gene consists of six highly polymorphic domains (called polymorphic blocks) flanked by fairly conserved sequences (two, four and five blocks)  as interspecies conserved blocks called ICBs  and one conserved domain (CB-3).
Many studies have indicated that MSP1 is highly immunogenic in natural malarial infections and often associated with parasite exposure [21–26]. As such, it has considerable potential as a candidate target for vaccine design and/or clinical trials [27–32]. Although short-lived, P. vivax MSP1 (referred to as Pv-MSP1) humoral immune response has been shown to be mostly against the polymorphic domains [27, 28, 33–35]. In individuals clinically protected from malaria, high levels of antibodies against a polymorphic domain in the N-terminus of Pv-MSP1 .
The current study identified occurrence of symptomless Plasmodium vivax-infected individuals during a two-months follow-up at the Rio Pardo rural settlement (Amazonas State, Brazil), and performing humoral immune response analysis (total IgG and subclasses) against Pv-MSP1.
Selected area and population
In November 2008, a cross-sectional study was performed in order to collect blood samples to determine malarial infection by Giemsa-stained blood thick smears and real-time PCR and for serological studies to evaluate humoral responses of individuals of the riverine community. At this time, a standardized questionnaire containing demographic, clinical and epidemiological data (number of previous malaria episodes, presence of signs and symptoms) was applied by trained and calibrated interviewers. After that, a longitudinal follow up (on site) was performed over two months and the participants continued to be interviewed and examined. Based on the results of Giemsa-stained thick blood smears obtained at cross sectional, the participants were initially classified into major groups: (M-) negative or (M+) positive thick blood smear, for P. vivax or P. falciparum infection. Next, rRNA gene-based nested PCR assay was performed to identify P. vivax, P. falciparum or mixed (P. vivax and P. falciparum) infections and the major were classified in minor subgroups: (PCR+/M-) positive mixed or P. vivax PCR and negative Giemsa-stained thick blood smears that showed no clinical symptoms of malaria during the two months of follow-up; (PCR+/M+) individuals positive for mixed or P. vivax PCR that were positive P. vivax for Giemsa-stained thick blood smears at cross sectional survey and had acute malaria. All subjects received anti-malarial drugs according to the practical guide for malaria treatment in Brazil . (PCR-/M-) negative individuals, who had no infection at cross sectional survey and individuals who were PCR positive or had malaria exclusively by P. falciparum were excluded from the study. Over 360 days, a prospective study was carried out and information about new malaria infection by P. vivax was collected through SIVEP-malaria database.
Sample collection and malarial infection diagnosis
Thick blood smears for malaria diagnosis were collected and read by a local microscopist as recommended by the Brazilian Ministry of Health . The slides were sent to a central laboratory and reviewed by an experienced microscopist, who confirmed the diagnosis.
Five ml peripheral blood was harvested by vein puncture, processed and stored at -20°C. DNA was extracted using a QIAGEN kit according to the manufacturer’s protocol. Electrophoresis was performed on a 0.6% agarose gel in 0.5X TBE buffer to confirm successful DNA extraction. Real-time PCR diagnoses were performed by means of a multiplex reaction as described elsewhere [38, 39]. All primers and probes were purchased from Applied Biosystems™. To discriminate between Plasmodium species, probes were constructed using a VIC or FAM dye flag for P. vivax or P. falciparum, respectively. TAMRA quencher was used for both probes. For standardization of the real-time PCR protocol, 30 malaria negative and 50 malaria positive samples from the FIOCRUZ-ILMD bank were used to optimize the test.
Recombinant protein production
The recombinant protein ICB2-5 (representing the N-terminus of Pv-MSP1) comprises three conserved blocks (Blocks 1, 3, and 5) and two variable blocks (Blocks 2 and 4) from the MSP1 protein of Belem strain as glutathione S-transferase (GST) fusion proteins [27–30, 33]. As a control, GST alone was also produced. GST and P. vivax recombinant protein were purified using glutathione-sepharose 4B columns (Amersham Pharmacia), and protein concentration was determined by Bio-Rad Protein Assay Kit I (Bio-Rad Laboratories, Inc) [27–30].
Humoral immune response analysis
Naturally acquired IgG antibodies against Pv-MSP1 have been characterized elsewhere by ELISA . Based on individual values for OD against recombinant proteins, all tests were done in duplicate. Firstly the average OD of ICB2-5 was calculated to exclude reactivity against GST. For each individual, the GST cut offs were calculated as average OD of GST adding two Standard Deviation (SD) values. Thus, a serum was considered positive if ICB2-5 OD minus individual GST cut-offs was greater than zero. Based on population variation against ICB2-5, the ICB2-5 cut off were calculated as average OD of sera samples adding two SD values from 20 healthy individuals who had never suffered malaria.
Similarly, the positivity of serum to ICB2-5 was determined if the average OD of ICB2-5 was greater than ICB2-5 cut off. For each IgG subclass the ICB2-5 cut off was determined from same 20 healthy individuals who had never suffered malaria.
IgG subclasses were determined by ELISA using specific monoclonal antibodies for each isotype (Sigma, St. Louis, MO, USA) as described [27, 30]. All sera were tested at dilutions of 1:100 in duplicate and monoclonal antibody binding was detected with peroxidase-conjugated anti-mouse immunoglobulin (Sigma).
Statistical analysis was performed using The R Project for Statistical Computing version 3.0.1. Normality was tested by Kolmogorov-Smirnov test. Logistic regression predicting positive vs. negative IgG anti ICB2-5 using non-infected subjects (PCR-/M- group) as reference was used to compare age, time of residence and time of last malaria attack. Differences in total IgG and subclasses levels were assessed between three groups (PCR-/M-; PCR+/M + and PCR+/M-) by one-way nonparametric Kruskal-Wallis test (first panel). Analysis to assess which group total IgG and subclasses levels were different was performed by non-parametric Dunn’s test for multiple comparisons (second panel). The significant differences (p < 0.05) were identified as letters “a” or “b”, intermediate level of antibodies was “ab”. The Kaplan-Meier survival analysis was performed to evaluate the probability of P. vivax infection over one year follow-up period (November 2008 to November 2009) between the serology groups negative and positive for ICB2-5. Individuals who were found infected in the cross-section period using Giemsa-stained thick blood smears were excluded from this analysis. P-values <0.05 were considered statistically significant.
The study was approved by the Research Ethical Committee of the Federal University of Amazonas (Ethical Approval No. 3640.0.000.115-07). Informed written consent was obtained from all participants. For those under 18 years old, parents were instructed about the objectives of the study and signed together with the participant an informed consent. All patients tested positive in the thick blood smear during the cross-sectional study were treated according to the anti-malarial treatment guidelines from the Brazilian Ministry of Health.
Recruitment and participant flow
Summary of epidemiological results
Age (median (SD)) (Minimum-Maximum)
32.78 (SD 19.2592)
NI (n (%))
Never had malaria or didn’t know
Result for the methods used for diagnosis
After diagnosis by rRNA gene-based nested PCR assay for P. vivax and P. falciparum, three individuals with P. falciparum mono-infection (PCR P. falciparum +) were excluded. From three hundred and eight individuals diagnosed by PCR, two hundred sixty eight individuals were uninfected at cross sectional because they were negative by microscopy examination and confirmed by PCR (PCR-/M-).
Further subclassification indicated that acute P. vivax infection was confirmed by microscopy examination and PCR in the fifteen individuals (PCR+/M+) of which one had acute P. vivax and P. falciparum infections. Twenty-five individuals whose diagnosis of P. vivax infections (which three with P. vivax and P. falciparum infections) was seen only in nested-PCR (PCR+/M-) showed no clinical symptoms of malaria over two-month follow-up (Figure 2).
Assessing humoral response against the N-terminus of Pv-MSP1
Logistic regression predicting positive vs. negative IgG anti ICB2-5
37.65 ± 1.92
30.48 ± 1.35
Time of residence
9.0 ± 3.4
7.5 ± 4.1
Time of last malaria attack
2 ± 5.1
2 ± 3.1
Considering others IgG subclass, although there were some differences in IgG2 response between PCR+/M- vs. PCR-/M- (p = 0.0092) levels observed between groups were very low (Figure 6B). And still, the mean levels of IgG1 and IgG4 were not different in comparison between groups (Figure 6C-D).
In the current study, antibody immune response against Pv-MSP1 was evaluated from a cross-sectional survey with 308 individuals living in hyperendemic areas. Higher levels of IgG3 against ICB2-5, corresponding to the N-terminus of MSP1 in P. vivax, were observed only in symptomless Plasmodium vivax-infected individuals.
Despite that recombinant ICB2-5 contains long stretches of amino acids that are conserved among the P. vivax haplotypes (Belem and Salvador), which explains the higher frequency of responders to this polypeptide in endemic areas in Brazil [20, 27, 29], it has been well established that these antibodies primarily recognize the variable domains (Blocks 2 and 4) of ICB2-5 [27, 35]. However, Pv-MSP1 Block 2 is poorly immunogenic and achievement of clinical protection may be dependent on successive exposure of polymorphic blocks or eliciting short-lived antibody responses that also require frequent boosting as occurs in asymptomatic infections .
Investigation of total IgG response to the N-terminus of Pv-MSP1 revealed no significant differences between individuals of PCR+/M- and PCR+/M+. As both groups represent respectively, contingents of infected persons with parasitaemia undetectable in thick blood smears and without clinical signs of malaria and those with patent parasitaemia and clinical symptoms, these data suggest that total IgG against the N-terminus of Pv-MSP1 may not be the only predictor of clinical protection. Nonetheless, total levels of IgG against the N-terminus of Pv-MSP1 were higher in individuals without clinical symptoms of malaria, corroborating with previous study . Moreover, whereas here IgG total levels were considered as a mean of PCR+/M- group, in previous study IgG total levels were analysed separately to each subject .
Analysis of antibody subclasses showed a stark difference in IgG3 levels of individuals from PCR+/M- in comparison to those had acute malaria, suggesting that higher levels of this subclass against the N-terminus of Pv-MSP1 could be related to absence of symptoms of malaria over two months of follow up. As parasitemia levels are detected only by real-time PCR and absence of symptoms of malaria does not allow determining since when these individuals were infected, it can be inferred that IgG3 dependent on continued exposure to the parasite could also be associated with this immune status.
Association between IgG3 antibodies and clinical protection from malaria was previously reported for P. falciparum antigens, such as MSP142, MSP119, AMA-1, MSP2 and MSP3 [22, 23, 40–44]. Similarly, IgG3 immune response to P. falciparum MSP1 (N-terminus) was associated with prolonged periods without malarial infection . Moreover, the presence of IgG3 against Block 2 of Pf-MSP1 of the individuals would be held by asymptomatic infection confers a protective effect for extended periods . IgG3 requires continuous stimulation to maintain effective levels of protection since IgG3 acts directly and indirectly to counter merozoite infection of red blood cells through the activation of monocytes [47–49].
Several studies have shown polymorphic antigens, including variants of the PfMSP1 Block-2, variants of the MSP-2, PvMSP5 frequently recognized by short-lived, species-specific antibodies [50–54]. It is possible that tandem, repeated, epitope sequences influence the ability to stimulate effective memory B-cell responses, unlike responses to antigens without repeat sequences (AMA1, EBA175, MSP2 or MSP119), in which responses are generally by both IgG1 and IgG3 [40, 41, 43, 44, 46, 55–58]. According to conservation theory, the IgG subclass may be associated with the degree of conservation of the antigen, with conserved antigens preferentially inducing IgG1, and polymorphic antigens preferentially inducing IgG3, particularly if they contain repetitive polymorphic sequences .
The presence of high levels of IgG antibodies against the N-terminus of Pv-MSP1 was previously shown in asymptomatic individuals infected with P. vivax. In this present study, information of new malaria infections was collected in Brazilian surveillance database over a year confirmed the Kaplan-Meier survival analysis for IgG total. However, the low number of positive IgG3 anti ICB2-5 hampered the Kaplan-Meier survival analysis for IgG3. Some factors could explain the lack of association of IgG3 in the survival analysis. It has been suggested that detectable levels of IgG3 may be particularly short-lived due to more rapid clearance of this subclass from the circulation [45, 46, 50, 54]. There was a decay API related to P. vivax incidence during the surveillance period (Figure 1E). And still, the decrease in the number of positive IgG3 responders would be inherent to the immunoassay, even using monoclonal antibodies commonly used in Brazilian populations.
The immune status established by P. vivax subpatent infection and symptomless indicates that ICB2-5 (corresponding to haplotype Belem) may be a potential candidate antigen to consider for malaria vaccine development. Based on study findings, optimal immunity may require sustained high levels of IgG3 against polymorphic malaria antigens, which may require special strategies that need to be factored into the vaccine development process.
This study was supported by funding from CNPq (Program FIOCRUZ-CNPq/Papes V) and FAPEAM (Fundação de Amparo a Pesquisa do Estado do Amazonas; Program PIPT – 2009). FGV and MEMA are supported by a Masters Scholarship from the Post-Graduate Program in Basic and Applied Immunology of the Federal University of the Amazonas. FIOCRUZ-ILMD funded logistical support for the study cohort. FTMC is enrolled by the Programa Estratégico de Ciência, Tecnologia & Inovação nas Fundações Estaduais de Saúde (PECTI/AM Saúde) of FAPEAM. FTMC is a Level 1D CNPq fellow. PAN and MVGL are Level 2 CNPq fellows.
- Mueller I, Galinski MR, Baird JK, Carlton JM, Kochar DK, Alonso PL, del Portillo HA: Key gaps in the knowledge of Plasmodium vivax, a neglected human malaria parasite. Lancet Infect Dis. 2009, 9: 555-566. 10.1016/S1473-3099(09)70177-X.View ArticlePubMedGoogle Scholar
- Galinski MR, Barnwell JW: Plasmodium vivax: who cares?. Malar J. 2008, 1 (7): S9-View ArticleGoogle Scholar
- Oliveira-Ferreira J, Lacerda MV, Brasil P, Ladislau JL, Tauil PL, Daniel-Ribeiro CT: Malaria in Brazil: an overview. Malar J. 2010, 9: 115-10.1186/1475-2875-9-115.PubMed CentralView ArticlePubMedGoogle Scholar
- Lacerda MV, Mourao MP, Alexandre MA, Siqueira AM, Magalhaes BM, Martinez-Espinosa FE, Filho FS, Brasil P, Ventura AM, Tada MS, Couto VS, Silva AR, Silva RS, Alecrim MG: Understanding the clinical spectrum of complicated Plasmodium vivax malaria: a systematic review on the contributions of the Brazilian literature. Malar J. 2012, 11: 12-10.1186/1475-2875-11-12.PubMed CentralView ArticlePubMedGoogle Scholar
- Costa FT, Lopes SC, Albrecht L, Ataide R, Siqueira AM, Souza RM, Russell B, Renia L, Marinho CR, Lacerda MV: On the pathogenesis of Plasmodium vivax malaria: perspectives from the Brazilian field. Int J Parasitol. 2012, 42: 1099-1105. 10.1016/j.ijpara.2012.08.007.View ArticlePubMedGoogle Scholar
- Carvalho BO, Lopes SC, Nogueira PA, Orlandi PP, Bargieri DY, Blanco YC, Mamoni R, Leite JA, Rodrigues MM, Soares IS, Oliveira TR, Wunderlich G, Lacerda MV, del Portillo HA, Araújo MO, Russell B, Suwanarusk R, Snounou G, Rénia L, Costa FT: On the cytoadhesion of Plasmodium vivax-infected erythrocytes. J Infect Dis. 2010, 202: 638-647. 10.1086/654815.View ArticlePubMedGoogle Scholar
- Lu F, Wang B, Cao J, Sattabongkot J, Zhou H, Zhu G, Kim K, Gao Q, Han ET: Prevalence of drug resistance-associated gene mutations in Plasmodium vivax in Central China. Korean J Parasitol. 2012, 50: 379-384. 10.3347/kjp.2012.50.4.379.PubMed CentralView ArticlePubMedGoogle Scholar
- Garg S, Saxena V, Lumb V, Pakalapati D, Boopathi PA, Subudhi AK, Chowdhury S, Kochar SK, Kochar DK, Sharma YD, Das A: Novel mutations in the antifolate drug resistance marker genes among Plasmodium vivax isolates exhibiting severe manifestations. Exp Parasitol. 2012, 132: 410-416. 10.1016/j.exppara.2012.09.018.View ArticlePubMedGoogle Scholar
- Vargas-Rodriguez Rdel C, da Silva BM, Menezes MJ, Orjuela-Sanchez P, Ferreira MU: Single-nucleotide polymorphism and copy number variation of the multidrug resistance-1 locus of Plasmodium vivax: local and global patterns. Am J Trop Med Hyg. 2012, 87: 813-821. 10.4269/ajtmh.2012.12-0094.View ArticlePubMedGoogle Scholar
- Kerlin DH, Boyce K, Marfurt J, Simpson JA, Kenangalem E, Cheng Q, Price RN, Gatton ML: An analytical method for assessing stage-specific drug activity in Plasmodium vivax malaria: implications for ex vivo drug susceptibility testing. PLoS Negl Trop Dis. 2012, 6: e1772-10.1371/journal.pntd.0001772.PubMed CentralView ArticlePubMedGoogle Scholar
- Marfurt J, Chalfein F, Prayoga P, Wabiser F, Wirjanata G, Sebayang B, Piera KA, Wittlin S, Haynes RK, Mohrle JJ, Anstey NM, Kenangalem E, Price RN: Comparative ex vivo activity of novel endoperoxides in multidrug-resistant Plasmodium falciparum and P. vivax. Antimicrob Agents Chemother. 2012, 56: 5258-5263. 10.1128/AAC.00283-12.PubMed CentralView ArticlePubMedGoogle Scholar
- Aguiar AC, Santos Rde M, Figueiredo FJ, Cortopassi WA, Pimentel AS, Franca TC, Meneghetti MR, Krettli AU: Antimalarial activity and mechanisms of action of two novel 4-aminoquinolines against chloroquine-resistant parasites. PLoS One. 2012, 7: e37259-10.1371/journal.pone.0037259.PubMed CentralView ArticlePubMedGoogle Scholar
- Baird JK: Resistance to chloroquine unhinges vivax malaria therapeutics. Antimicrob Agents Chemother. 2011, 55: 1827-1830. 10.1128/AAC.01296-10.PubMed CentralView ArticlePubMedGoogle Scholar
- Gama BE, Lacerda MV, Daniel-Ribeiro CT, Ferreira-da-Cruz Mde F: Chemoresistance of Plasmodium falciparum and Plasmodium vivax parasites in Brazil: consequences on disease morbidity and control. Mem Inst Oswaldo Cruz. 2011, 106 (1): 159-166.View ArticlePubMedGoogle Scholar
- Alexandre MA, Ferreira CO, Siqueira AM, Magalhaes BL, Mourao MP, Lacerda MV, Alecrim M: Severe Plasmodium vivax malaria, Brazilian Amazon. Emerg Infect Dis. 2010, 16: 1611-1614. 10.3201/eid1610.100685.PubMed CentralView ArticlePubMedGoogle Scholar
- Price RN, Douglas NM, Anstey NM: New developments in Plasmodium vivax malaria: severe disease and the rise of chloroquine resistance. Curr Opin Infect Dis. 2009, 22: 430-435. 10.1097/QCO.0b013e32832f14c1.View ArticlePubMedGoogle Scholar
- Holder AA, Blackman MJ, Burghaus PA, Chappel JA, Ling IT, McCallum-Deighton N, Shai S: A malaria merozoite surface protein (MSP1)-structure, processing and function. Mem Inst Oswaldo Cruz. 1992, 87 (Suppl 3): 37-42.View ArticlePubMedGoogle Scholar
- Kadekoppala M, Holder AA: Merozoite surface proteins of the malaria parasite: the MSP1 complex and the MSP7 family. Int J Parasitol. 2010, 40: 1155-1161. 10.1016/j.ijpara.2010.04.008.View ArticlePubMedGoogle Scholar
- Putaporntip C, Jongwutiwes S, Sakihama N, Ferreira MU, Kho WG, Kaneko A, Kanbara H, Hattori T, Tanabe K: Mosaic organization and heterogeneity in frequency of allelic recombination of the Plasmodium vivax merozoite surface protein-1 locus. Proc Natl Acad Sci USA. 2002, 99: 16348-16353. 10.1073/pnas.252348999.PubMed CentralView ArticlePubMedGoogle Scholar
- del Portillo HA, Longacre S, Khouri E, David PH: Primary structure of the merozoite surface antigen 1 of Plasmodium vivax reveals sequences conserved between different Plasmodium species. Proc Natl Acad Sci USA. 1991, 88: 4030-4034. 10.1073/pnas.88.9.4030.PubMed CentralView ArticlePubMedGoogle Scholar
- Ellis RD, Wu Y, Martin LB, Shaffer D, Miura K, Aebig J, Orcutt A, Rausch K, Zhu D, Mogensen A, Fay MP, Narum DL, Long C, Miller L, Durbin AP: Phase 1 study in malaria naive adults of BSAM2/Alhydrogel(R) + CPG 7909, a blood stage vaccine against P. falciparum malaria. PLoS One. 2012, 7: e46094-10.1371/journal.pone.0046094.PubMed CentralView ArticlePubMedGoogle Scholar
- Bergmann-Leitner ES, Duncan EH, Mease RM, Angov E: Impact of pre-existing MSP1(42)-allele specific immunity on potency of an erythrocytic Plasmodium falciparum vaccine. Malar J. 2012, 11: 315-10.1186/1475-2875-11-315.PubMed CentralView ArticlePubMedGoogle Scholar
- Moss DK, Remarque EJ, Faber BW, Cavanagh DR, Arnot DE, Thomas AW, Holder AA: Plasmodium falciparum 19-kilodalton merozoite surface protein 1 (MSP1)-specific antibodies that interfere with parasite growth in vitro can inhibit MSP1 processing, merozoite invasion, and intracellular parasite development. Infect Immun. 2012, 80: 1280-1287. 10.1128/IAI.05887-11.PubMed CentralView ArticlePubMedGoogle Scholar
- Cowan GJ, Creasey AM, Dhanasarnsombut K, Thomas AW, Remarque EJ, Cavanagh DR: A malaria vaccine based on the polymorphic block 2 region of MSP-1 that elicits a broad serotype-spanning immune response. PLoS One. 2011, 6: e26616-10.1371/journal.pone.0026616.PubMed CentralView ArticlePubMedGoogle Scholar
- Sheehy SH, Duncan CJ, Elias SC, Collins KA, Ewer KJ, Spencer AJ, Williams AR, Halstead FD, Moretz SE, Miura K, Epp C, Dicks MD, Poulton ID, Lawrie AM, Berrie E, Moyle S, Long CA, Colloca S, Cortese R, Gilbert SC, Nicosia A, Hill AV, Draper SJ: Phase Ia clinical evaluation of the Plasmodium falciparum blood-stage antigen MSP1 in ChAd63 and MVA vaccine vectors. Mol Ther. 2011, 19: 2269-2276. 10.1038/mt.2011.176.PubMed CentralView ArticlePubMedGoogle Scholar
- Tetteh KK, Conway DJ: A polyvalent hybrid protein elicits antibodies against the diverse allelic types of block 2 in Plasmodium falciparum merozoite surface protein 1. Vaccine. 2011, 29: 7811-7817. 10.1016/j.vaccine.2011.07.106.PubMed CentralView ArticlePubMedGoogle Scholar
- Soares IS, Levitus G, Souza JM, Del Portillo HA, Rodrigues MM: Acquired immune responses to the N- and C-terminal regions of Plasmodium vivax merozoite surface protein 1 in individuals exposed to malaria. Infect Immun. 1997, 65: 1606-1614.PubMed CentralPubMedGoogle Scholar
- Soares IS, da Cunha MG, Silva MN, Souza JM, Del Portillo HA, Rodrigues MM: Longevity of naturally acquired antibody responses to the N- and C-terminal regions of Plasmodium vivax merozoite surface protein 1. Am J Trop Med Hyg. 1999, 60: 357-363.PubMedGoogle Scholar
- Levitus G, Mertens F, Speranca MA, Camargo LM, Ferreira MU, del Portillo HA: Characterization of naturally acquired human IgG responses against the N-terminal region of the merozoite surface protein 1 of Plasmodium vivax. Am J Trop Med Hyg. 1994, 51: 68-76.PubMedGoogle Scholar
- Nogueira PA, Alves FP, Fernandez-Becerra C, Pein O, Santos NR, da Silva LH P, Camargo EP, del Portillo HA: A reduced risk of infection with Plasmodium vivax and clinical protection against malaria are associated with antibodies against the N terminus but not the C terminus of merozoite surface protein 1. Infect Immun. 2006, 74: 2726-2733. 10.1128/IAI.74.5.2726-2733.2006.PubMed CentralView ArticlePubMedGoogle Scholar
- Fernandez-Becerra C, Sanz S, Brucet M, Stanisic DI, Alves FP, Camargo EP, Alonso PL, Mueller I, del Portillo HA: Naturally-acquired humoral immune responses against the N- and C-termini of the Plasmodium vivax MSP1 protein in endemic regions of Brazil and Papua New Guinea using a multiplex assay. Malar J. 2010, 9: 29-10.1186/1475-2875-9-29.PubMed CentralView ArticlePubMedGoogle Scholar
- Storti-Melo LM, Souza-Neiras WC, Cassiano GC, Taveira LC, Cordeiro AJ, Couto VS, Povoa MM, Cunha MG, Echeverry DM, Rossit AR, Arévalo-Herrera M, Herrera S, Machado RL: Evaluation of the naturally acquired antibody immune response to the Pv200L N-terminal fragment of Plasmodium vivax merozoite surface protein-1 in four areas of the Amazon Region of Brazil. Am J Trop Med Hyg. 2011, 84 (Suppl 2): 58-63.PubMed CentralView ArticlePubMedGoogle Scholar
- del Portillo HA, Levitus G, Camargo LM, Ferreira MU, Mertens F: Human IgG responses against the N-terminal region of the Merozoite Surface Protein 1 of Plasmodium vivax. Mem Inst Oswaldo Cruz. 1992, 87 (Suppl 3): 77-84.View ArticlePubMedGoogle Scholar
- Mertens F, Levitus G, Camargo LM, Ferreira MU, Dutra AP, Del Portillo HA: Longitudinal study of naturally acquired humoral immune responses against the merozoite surface protein 1 of Plasmodium vivax in patients from Rondonia, Brazil. Am J Trop Med Hyg. 1993, 49: 383-392.PubMedGoogle Scholar
- Bastos MS, da Silva-Nunes M, Malafronte RS, Hoffmann EH, Wunderlich G, Moraes SL, Ferreira MU: Antigenic polymorphism and naturally acquired antibodies to Plasmodium vivax merozoite surface protein 1 in rural Amazonians. Clin Vaccine Immunol. 2007, 14: 1249-1259. 10.1128/CVI.00243-07.PubMed CentralView ArticlePubMedGoogle Scholar
- Browder J, Pedlowski M, Walker R, Wynee R, Summers P, Abad A, Becerra-Cordoba N, Mil-Homens J: Revisiting theories of frontier expansion in the Brazilian Amazon: a survey of the colonist farming population in Rondonia’s post-frontier, 1992-2002. World Development. 2008, 36: 1469-1492. 10.1016/j.worlddev.2007.08.008.View ArticleGoogle Scholar
- Fontes CJF, Santelli ACFS, da Silva CJ M, Tauil PL, Ladislau JLB: Malaria’s treatment in Brazil practical guide. 2010, Secretariat of Health Surveillance Epidemiological Surveillance Department, National Ministry of Health. http://bvsms.saude.gov.br/bvs/publicacoes/guia_pratico_malaria.pdfGoogle Scholar
- Perandin F, Manca N, Calderaro A, Piccolo G, Galati L, Ricci L, Medici MC, Arcangeletti MC, Snounou G, Dettori G, Chezzi C: Development of a real-time PCR assay for detection of Plasmodium falciparum, Plasmodium vivax, and Plasmodium ovale for routine clinical diagnosis. J Clin Microbiol. 2004, 42: 1214-1219. 10.1128/JCM.42.3.1214-1219.2004.PubMed CentralView ArticlePubMedGoogle Scholar
- Rougemont M, Van Saanen M, Sahli R, Hinrikson HP, Bille J, Jaton K: Detection of four Plasmodium species in blood from humans by 18S rRNA gene subunit-based and species-specific real-time PCR assays. J Clin Microbiol. 2004, 42: 5636-5643. 10.1128/JCM.42.12.5636-5643.2004.PubMed CentralView ArticlePubMedGoogle Scholar
- Galamo CD, Jafarshad A, Blanc C, Druilhe P: Anti-MSP1 block 2 antibodies are effective at parasite killing in an allele-specific manner by monocyte-mediated antibody-dependent cellular inhibition. J Infect Dis. 2009, 199: 1151-1154. 10.1086/597426.View ArticlePubMedGoogle Scholar
- Sarthou JL, Angel G, Aribot G, Rogier C, Dieye A, Toure Balde A, Diatta B, Seignot P, Roussilhon C: Prognostic value of anti-Plasmodium falciparum-specific immunoglobulin G3, cytokines, and their soluble receptors in West African patients with severe malaria. Infect Immun. 1997, 65: 3271-3276.PubMed CentralPubMedGoogle Scholar
- Miura K, Zhou H, Diouf A, Moretz SE, Fay MP, Miller LH, Martin LB, Pierce MA, Ellis RD, Mullen GE, Long CA: Anti-apical-membrane-antigen-1 antibody is more effective than anti-42-kilodalton-merozoite-surface-protein-1 antibody in inhibiting Plasmodium falciparum growth, as determined by the in vitro growth inhibition assay. Clin Vaccine Immunol. 2009, 16: 963-968. 10.1128/CVI.00042-09.PubMed CentralView ArticlePubMedGoogle Scholar
- Jouin H, Rogier C, Trape JF, Mercereau-Puijalon O: Fixed, epitope-specific, cytophilic antibody response to the polymorphic block 2 domain of the Plasmodium falciparum merozoite surface antigen MSP-1 in humans living in a malaria-endemic area. Eur J Immunol. 2001, 31: 539-550. 10.1002/1521-4141(200102)31:2<539::AID-IMMU539>3.0.CO;2-1.View ArticlePubMedGoogle Scholar
- Lazarou M, Guevara Patino JA, Jennings RM, McIntosh RS, Shi J, Howell S, Cullen E, Jones T, Adame-Gallegos JR, Chappel JA, McBride JS, Blackman MJ, Holder AA, Pleass RJ: Inhibition of erythrocyte invasion and Plasmodium falciparum merozoite surface protein 1 processing by human immunoglobulin G1 (IgG1) and IgG3 antibodies. Infect Immun. 2009, 77: 5659-5667. 10.1128/IAI.00167-09.PubMed CentralView ArticlePubMedGoogle Scholar
- Cavanagh DR, Dodoo D, Hviid L, Kurtzhals JA, Theander TG, Akanmori BD, Polley S, Conway DJ, Koram K, McBride JS: Antibodies to the N-terminal block 2 of Plasmodium falciparum merozoite surface protein 1 are associated with protection against clinical malaria. Infect Immun. 2004, 72: 6492-6502. 10.1128/IAI.72.11.6492-6502.2004.PubMed CentralView ArticlePubMedGoogle Scholar
- Roussilhon C, Oeuvray C, Muller-Graf C, Tall A, Rogier C, Trape JF, Theisen M, Balde A, Perignon JL, Druilhe P: Long-term clinical protection from falciparum malaria is strongly associated with IgG3 antibodies to merozoite surface protein 3. PLoS Med. 2007, 4: e320-10.1371/journal.pmed.0040320.PubMed CentralView ArticlePubMedGoogle Scholar
- Jafarshad A, Dziegiel MH, Lundquist R, Nielsen LK, Singh S, Druilhe PL: A novel antibody-dependent cellular cytotoxicity mechanism involved in defense against malaria requires costimulation of monocytes FcgammaRII and FcgammaRIII. J Immunol. 2007, 178: 3099-3106.View ArticlePubMedGoogle Scholar
- Druilhe P, Perignon JL: Mechanisms of defense against P. falciparum asexual blood stages in humans. Immunol Lett. 1994, 41: 115-120. 10.1016/0165-2478(94)90118-X.View ArticlePubMedGoogle Scholar
- Druilhe P, Perignon JL: A hypothesis about the chronicity of malaria infection. Parasitol Today. 1997, 13: 353-357. 10.1016/S0169-4758(97)01095-8.View ArticlePubMedGoogle Scholar
- Woodberry T, Minigo G, Piera KA, Hanley JC, de Silva HD, Salwati E, Kenangalem E, Tjitra E, Coppel RL, Price RN, Anstey NM, Plebanski M: Antibodies to Plasmodium falciparum and Plasmodium vivax merozoite surface protein 5 in Indonesia: species-specific and cross-reactive responses. J Infect Dis. 2008, 198: 134-142. 10.1086/588711.View ArticlePubMedGoogle Scholar
- McCallum FJ, Persson KE, Mugyenyi CK, Fowkes FJ, Simpson JA, Richards JS, Williams TN, Marsh K, Beeson JG: Acquisition of growth-inhibitory antibodies against blood-stage Plasmodium falciparum. PLoS One. 2008, 3: e3571-10.1371/journal.pone.0003571.PubMed CentralView ArticlePubMedGoogle Scholar
- Stubbs J, Olugbile S, Saidou B, Simpore J, Corradin G, Lanzavecchia A: Strain-transcending Fc-dependent killing of Plasmodium falciparum by merozoite surface protein 2 allele-specific human antibodies. Infect Immun. 2011, 79: 1143-1152. 10.1128/IAI.01034-10.PubMed CentralView ArticlePubMedGoogle Scholar
- Bouharoun-Tayoun H, Oeuvray C, Lunel F, Druilhe P: Mechanisms underlying the monocyte-mediated antibody-dependent killing of Plasmodium falciparum asexual blood stages. J Exp Med. 1995, 182: 409-418. 10.1084/jem.182.2.409.View ArticlePubMedGoogle Scholar
- Akpogheneta OJ, Duah NO, Tetteh KK, Dunyo S, Lanar DE, Pinder M, Conway DJ: Duration of naturally acquired antibody responses to blood-stage Plasmodium falciparum is age dependent and antigen specific. Infect Immun. 2008, 76: 1748-1755. 10.1128/IAI.01333-07.PubMed CentralView ArticlePubMedGoogle Scholar
- Scopel KK, da Silva-Nunes M, Malafronte RS, Braga EM, Ferreira MU: Variant-specific antibodies to merozoite surface protein 2 and clinical expression of Plasmodium falciparum malaria in rural Amazonians. Am J Trop Med Hyg. 2007, 76: 1084-1091.PubMedGoogle Scholar
- Cavanagh DR, Dobano C, Elhassan IM, Marsh K, Elhassan A, Hviid L, Khalil EA, Theander TG, Arnot DE, McBride JS: Differential patterns of human immunoglobulin G subclass responses to distinct regions of a single protein, the merozoite surface protein 1 of Plasmodium falciparum. Infect Immun. 2001, 69: 1207-1211. 10.1128/IAI.69.2.1207-1211.2001.PubMed CentralView ArticlePubMedGoogle Scholar
- Bueno LL, Lobo FP, Morais CG, Mourao LC, de Avila RA, Soares IS, Fontes CJ, Lacerda MV, Chavez Olortegui C, Bartholomeu DC, Fujiwara RT, Braga EM: Identification of a highly antigenic linear B cell epitope within Plasmodium vivax apical membrane antigen 1 (AMA-1). PLoS One. 2011, 6: e21289-10.1371/journal.pone.0021289.PubMed CentralView ArticlePubMedGoogle Scholar
- Okenu DM, Riley EM, Bickle QD, Agomo PU, Barbosa A, Daugherty JR, Lanar DE, Conway DJ: Analysis of human antibodies to erythrocyte binding antigen 175 of Plasmodium falciparum. Infect Immun. 2000, 68: 5559-5566. 10.1128/IAI.68.10.5559-5566.2000.PubMed CentralView ArticlePubMedGoogle Scholar
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