Modulation of the cellular immune response during Plasmodium falciparum infections in sickle cell trait individuals

Author:

ABU-ZEID Y A1,THEANDER T G23,ABDULHADI N H1,HVIID L23,SAEED B O1,JEPSEN S4,JENSEN J B5,BAYOUMI R A1

Affiliation:

1. Department of Biochemistry, Faculty of Medicine, University of Khartoum, Sudan

2. Department of Infectious Diseases, University Hospital, Copenhagen, Denmark

3. Institute for Medical Microbiology, University of Copenhagen. Copenhagen, Denmark

4. WHO National Malaria Diagnostic Centre, Slate Serum Institute, Copenhagen, Denmark

5. Department of Microbiology, Brigham Young University, Provo, UT, USA

Abstract

SUMMARY Plasma and peripheral blood mononuclear cells (PBMC) were obtained from P. falciparum-infecled individuals with and without the sickle cell trait at diagnosis and 7 days after treatment. I lbAA and HbAS patients were compared for levels of plasma soluble IL-2 receptors (IL-2R) and the in vitro cellular reactivity to affinity-purified soluble P. falciparum antigens (SPAg). PPD and phytohae-magglutinin (PHA). At diagnosis. HbAS patients with clinical disease had lower plasma-soluble IL-2R levels and parasite counts than the corresponding HbAA patients, whereas HbAS and HbAA patients with asymptomatic infections had comparable soluble IL-2R levels and parasite counts. PBMC from HbAS patients had higher proliferation and IFN-γ production in response to SPAg than PBMC from HbAA patients. The difference in the lymphoproliferativc responses to SPAg between the two groups was evident in patients with asymptomatic infections. In all patients, the clinical severity, the soluble IL-2R levels and the parasite counts were directly related. The former two were inversely related to the proliferative responses to SPAg. After treatment, all the studied parameters were comparable in the two groups. The study indicates that during P. falciparum infection, HbAS compared with HbAA patients had lower in vivo cellular activation and higher in vitro cellular reactivity in response to soluble malaria antigens.

Publisher

Oxford University Press (OUP)

Subject

Immunology,Immunology and Allergy

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