A LONGITUDINAL-STUDY OF NATURALLY ACQUIRED CELLULAR AND HUMORAL IMMUNE-RESPONSES TO A MEROZOITE SURFACE PROTEIN (MSP1) OF PLASMODIUM-FALCIPARUM IN AN AREA OF SEASONAL MALARIA TRANSMISSION
Em. Riley et al., A LONGITUDINAL-STUDY OF NATURALLY ACQUIRED CELLULAR AND HUMORAL IMMUNE-RESPONSES TO A MEROZOITE SURFACE PROTEIN (MSP1) OF PLASMODIUM-FALCIPARUM IN AN AREA OF SEASONAL MALARIA TRANSMISSION, Parasite immunology, 15(9), 1993, pp. 513-524
A longitudinal study of cellular and serological responses to the majo
r merozoite surface protein of Plasmodium falciparum (PfMSP1) has been
conducted in a malaria immune population living in The Gambia, where
malaria transmission is seasonally endemic. Recombinant or native prot
eins representing the sequence of PfMSPI from the Wellcome strain of P
. falciparum were used in in vitro lymphocyte proliferation, cytokine
and antibody assays. Cellular responses of individual donors fluctuate
d over time, independent of seasonal changes in malaria transmission w
hereas anti-PfMSP1 antibody levels were remarkably stable. At a popula
tion level, IFNgamma responses were both more prevalent and of greater
magnitude at the end of the rainy (malaria transmission) season than
during the dry season. Responses of individuals living in a rural vill
age were compared with those of individuals living in an urban area wi
th much lower levels of malaria transmission. Malaria infections were
more likely to be symptomatic in urban dwellers than in inhabitants of
rural villages but no significant differences in the level or prevale
nce of cellular or serological responses were seen between the two gro
ups. However, urban dwellers with current symptomatic malaria infectio
ns had somewhat lower anti-PfMSP1 antibody levels than their healthy,
non-parasitaemic neighbours.