About: Mechanisms of protective immune responses induced by the Plasmodium falciparum circumsporozoite protein-based, self-assembling protein nanoparticle vaccine

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About: Mechanisms of protective immune responses induced by the Plasmodium falciparum circumsporozoite protein-based, self-assembling protein nanoparticle vaccine Goto Sponge NotDistinct Permalink

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type	Academic Article research paper schema:ScholarlyArticle
isDefinedBy	Covid-on-the-Web dataset
title	Mechanisms of protective immune responses induced by the Plasmodium falciparum circumsporozoite protein-based, self-assembling protein nanoparticle vaccine
Creator	Burkhard, Peter Yang, Yongkun Lanar, David Apf Doll, Tais Golden, Hannah Kaba, Stephen Mccoy, Mccoy, Margaret
source	Medline; PMC
abstract	BACKGROUND: A lack of defined correlates of immunity for malaria, combined with the inability to induce long-lived sterile immune responses in a human host, demonstrate a need for improved understanding of potentially protective immune mechanisms for enhanced vaccine efficacy. Protective sterile immunity (>90%) against the Plasmodium falciparum circumsporozoite protein (CSP) has been achieved using a transgenically modified Plasmodium berghei sporozoite (Tg-Pb/PfCSP) and a self-assembling protein nanoparticle (SAPN) vaccine presenting CSP epitopes (PfCSP-SAPN). Here, several possible mechanisms involved in the independently protective humoral and cellular responses induced following SAPN immunization are described. METHODS: Inbred mice were vaccinated with PfCSP-SAPN in PBS. Serum antibodies were harvested and effects on P. falciparum sporozoites mobility and integrity were examined using phase contrast microscopy. The functionality of SAPN-induced antibodies on inhibition of sporozoite invasion and growth within primary human hepatocytes was also examined. The internal processing of SAPN by bone marrow-derived dendritic cells (BMDDC), using organelle-specific, fluorescent-tagged antibody or gold-encapsulated SAPN, was observed using confocal or electron microscopy, respectively. RESULTS: The results of this work demonstrate that PfCSP-SAPN induces epitope-specific antibody titers, predominantly of the Th2 isotype IgG1, and that serum antibodies from PfCSP-SAPN-immunized mice appear to target P. falciparum sporozoites via the classical pathway of complement. This results in sporozoite death as indicated by cessation of motility and the circumsporozoite precipitation reaction. Moreover, PfCSP-SAPN-induced antibodies are able to inhibit wild-type P. falciparum sporozoite invasion and growth within cultured primary human hepatocytes. In addition, the observation that PfCSP-SAPN are processed (and presented) to the immune system by dendritic cells in a slow and continuous fashion via transporter associated with antigen processing (TAP) recruitment to the early endosome (EE), and have partially delayed processing through the endoplasmic reticulum, has the potential to induce the long-lived, effector memory CD8(+) T-cells as described previously. CONCLUSION: This paper describes the examination of humoral and cellular immune mechanisms induced by PfCSP-SAPN vaccination which result in sterile host protection against a transgenic P. berghei malaria sporozoite expressing the P. falciparum CSP, and which significantly inhibits native P. falciparum sporozoites from invading and developing within cultured human hepatocytes. These results may indicate the type and mode of action of protective antibodies needed to control P. falciparum sporozoites from infecting humans as well as a potential mechanism of induction of protective long-lived effector memory CD8(+) T-cells.
has issue date	2013-04-22(xsd:dateTime)
bibo:doi	10.1186/1475-2875-12-136
bibo:pmid	23607541
has license	cc-by
sha1sum (hex)	b8e9fcc34571f9c29e04f9feb34197250556cb9a
schema:url	https://doi.org/10.1186/1475-2875-12-136
resource representing a document's title	Mechanisms of protective immune responses induced by the Plasmodium falciparum circumsporozoite protein-based, self-assembling protein nanoparticle vaccine
has PubMed Central identifier	PMC3765086
has PubMed identifier	23607541
schema:publication	Malar J
resource representing a document's body	covid:b8e9fcc34571f9c29e04f9feb34197250556cb9a#body_text
is schema:about of	named entity 'HAVE' named entity 'ELECTRON MICROSCOPY' named entity 'POSSIBLE' named entity 'LONG' named entity 'ISOTYPE' named entity 'MOBILITY' named entity 'MECHANISMS' named entity 'FASHION' named entity 'INDUCE' named entity 'SLOW' named entity 'INDUCED' named entity 'ANTIBODY' named entity 'DERIVED' named entity 'INHIBITION' named entity 'COMPLEMENT' named entity 'PLASMODIUM FALCIPARUM' named entity 'POTENTIAL' named entity 'SPOROZOITES' named entity 'TO INHIBIT' named entity 'WILD-TYPE' named entity 'SPOROZOITE' named entity 'PROCESSED' named entity 'DEATH' named entity 'IMMUNITY' named entity 'CLASSICAL PATHWAY' named entity 'HOST' named entity 'CD8' named entity 'CSP' named entity 'T-CELLS' named entity 'EPITOPES' named entity 'INVOLVED' named entity 'EFFECTOR' named entity 'MOTILITY' named entity 'RECRUITMENT' named entity 'VACCINATED' named entity 'EFFECTS' named entity 'VACCINE' named entity 'IMMUNE SYSTEM' named entity 'DENDRITIC CELLS' named entity 'BASED' named entity 'invasion' named entity 'isotype' named entity 'human' named entity 'cellular' named entity 'human' named entity 'CSP' named entity 'protein' named entity 'vaccine' named entity 'PROTEIN ' named entity 'CIRCUMSPOROZOITE PROTEIN' covid:arg/b8e9fcc34571f9c29e04f9feb34197250556cb9a named entity 'PROCESSING' named entity 'FLUORESCENT' named entity 'IMMUNIZATION' named entity 'INBRED MICE' named entity 'GROWTH' named entity 'INVASION' named entity 'TAGGED' named entity 'P. FALCIPARUM' named entity 'APPEAR' named entity 'EPITOPE' named entity 'PROTEIN ' named entity 'PREVIOUSLY' named entity 'NANOPARTICLE' named entity 'OBSERVATION' named entity 'SPECIFIC ANTIBODY' named entity 'HEPATOCYTES' named entity 'VACCINE EFFICACY' named entity 'CONTINUOUS' named entity 'BACKGROUND' named entity 'ENDOPLASMIC RETICULUM' named entity 'PLASMODIUM BERGHEI' named entity 'BONE MARROW' named entity 'IMPROVED'

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