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Updated: Sep 4, 2025
Measuring Naturally Acquired Phagocytosis-Inducing Antibodies to Plasmodium falciparum Parasites by a Flow Cytometry-Based Assay
Published on: August 6, 2020
Age-dependent changes in circulating Tfh cells influence development of functional malaria antibodies in children
Jo-Anne Chan1,2,3, Jessica R Loughland4,5, Lauren de la Parte6
1Burnet Institute, Melbourne, VIC, Australia.
Insights
T-follicular helper (Tfh) cells and functional antibodies are crucial for malaria protection. This study reveals age-dependent shifts in Tfh cell types and antibody responses in children, highlighting their complex interplay in immunity.
Area of Science:
- Immunology
- Malariology
- Pediatrics
Background:
- T-follicular helper (Tfh) cells are critical for antibody production, essential for protective immunity against malaria.
- Factors influencing Tfh cell differentiation and functional antibody development in malaria-exposed children remain poorly understood.
Purpose of the Study:
- To characterize Tfh cell populations and functional antibodies against various malaria parasite stages in children from a high-transmission area.
- To investigate the influence of age, malaria exposure, and infection status on Tfh cell dynamics and antibody acquisition.
Main Methods:
- Cross-sectional study design utilizing samples from children in Uganda, a region with high malaria transmission.
- Analysis of Tfh cell subsets (Th1, Th2) and their activation/proliferation markers.
- Assessment of functional antibodies targeting different malaria parasite stages (merozoite, sporozoite, gametocyte).
Main Results:
- A significant age-dependent redistribution of the Tfh cell compartment was observed, independent of malaria exposure.
- Th2-Tfh cells were dominant in early childhood, with a gradual increase in Th1-Tfh cells throughout the first decade.
- Functional antibody acquisition was age-dependent and stage-specific, with merozoite antibodies acquired first, followed by sporozoite and gametocyte antibodies.
- Antibody levels were boosted during current infections and were higher in females, with elevated Tfh cell activation in individuals with the highest antibody titers.
Conclusions:
- Circulating Tfh cell populations undergo substantial age-related changes in early life, influencing antibody development.
- Antibody responses to malaria are acquired hierarchically and are modulated by age, infection status, and sex.
- Tfh cells play a pivotal role in driving functional antibody responses crucial for malaria immunity.
Abstract:
T-follicular helper (Tfh) cells are key drivers of antibodies that protect from malaria. However, little is known regarding the host and parasite factors that influence Tfh and functional antibody development. Here, we use samples from a large cross-sectional study of children residing in an area of high malaria transmission in Uganda to characterize Tfh cells and functional antibodies to multiple parasites stages. We identify a dramatic re-distribution of the Tfh cell compartment with age that is independent of malaria exposure, with Th2-Tfh cells predominating in early childhood, while Th1-Tfh cell gradually increase to adult levels over the first decade of life. Functional antibody acquisition is age-dependent and hierarchical acquired based on parasite stage, with merozoite responses followed by sporozoite and gametocyte antibodies. Antibodies are boosted in children with current infection, and are higher in females. The children with the very highest antibody levels have increased Tfh cell activation and proliferation, consistent with a key role of Tfh cells in antibody development. Together, these data reveal a complex relationship between the circulating Tfh compartment, antibody development and protection from malaria.
