Protective CD8+ T cells against Plasmodium liver stages: Immunobiology of an 'unnatural' immune response

Michael Glen Overstreet, Ian Andrew Cockburn, Yun Chi Chen, Fidel P Zavala

Research output: Contribution to journalArticle

Abstract

Immunization with high doses of irradiated sporozoites delivered by the bites of infected mosquitoes has been shown to induce protective responses against malaria, mediated in part by CD8+ T cells. In contrast, natural transmission involving low exposure to live sporozoite antigen fails to elicit strong immunity. In this review, we examine how irradiated sporozoite immunization breaks the natural host-parasite interaction and induces protective CD8+ T cells. Upon biting, the malaria-infected mosquitoes deposit parasites in the skin, many of which eventually exit to the bloodstream and infect hepatocytes. However, certain antigens, including the circumsporozoite (CS) protein, remain in the skin and are presented in the draining lymph node. These antigens prime specific CD8+ T cells, which migrate to the liver where they eliminate parasitized hepatocytes. We discuss the relevance of the different tissue compartments involved in the induction and effector phases of this response, as well as the cellular requirements for priming and memory development of CD8+ T cells, which include a complete dependence on dendritic cells and a near absolute need for CD4+ T-cell help. Finally, we discuss the impact of the immunodominant CS protein on this protection and the implications of these findings for vaccine design.

Original languageEnglish (US)
Pages (from-to)272-283
Number of pages12
JournalImmunological Reviews
Volume225
Issue number1
DOIs
StatePublished - Oct 2008

Fingerprint

Plasmodium
Sporozoites
T-Lymphocytes
Liver
Culicidae
Antigens
Malaria
Hepatocytes
Immunization
Host-Parasite Interactions
Skin
Bites and Stings
Dendritic Cells
Immunity
Parasites
Proteins
Vaccines
Lymph Nodes

Keywords

  • CD8 T cells
  • Liver
  • Lymph node
  • Malaria
  • Memory
  • Sporozoite

ASJC Scopus subject areas

  • Immunology

Cite this

Protective CD8+ T cells against Plasmodium liver stages : Immunobiology of an 'unnatural' immune response. / Overstreet, Michael Glen; Cockburn, Ian Andrew; Chen, Yun Chi; Zavala, Fidel P.

In: Immunological Reviews, Vol. 225, No. 1, 10.2008, p. 272-283.

Research output: Contribution to journalArticle

Overstreet, Michael Glen ; Cockburn, Ian Andrew ; Chen, Yun Chi ; Zavala, Fidel P. / Protective CD8+ T cells against Plasmodium liver stages : Immunobiology of an 'unnatural' immune response. In: Immunological Reviews. 2008 ; Vol. 225, No. 1. pp. 272-283.
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