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    Jaundice, caused by bilirubin buildup, is a protective response to malaria. Higher bilirubin levels in asymptomatic infections limit parasite growth and reduce malaria mortality.

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    Area of Science:

    • Biochemistry
    • Immunology
    • Parasitology

    Background:

    • Jaundice is a common malaria symptom linked to bilirubin accumulation.
    • The adaptive role of jaundice in Plasmodium infection remains unclear.

    Purpose of the Study:

    • To investigate the role of bilirubin in malaria pathogenesis.
    • To determine if jaundice is a protective or detrimental host response to Plasmodium infection.

    Main Methods:

    • Comparative analysis of bilirubin levels in asymptomatic versus symptomatic malaria patients.
    • Genetic manipulation of bilirubin synthesis and conjugation pathways in mouse models of malaria.
    • In vitro studies assessing the effect of unconjugated bilirubin on Plasmodium falciparum proliferation and parasite organelle function.

    Main Results:

    • Asymptomatic Plasmodium falciparum infection showed a significantly higher ratio of unconjugated bilirubin to parasite burden compared to symptomatic malaria.
    • Genetic suppression of bilirubin synthesis (BVRA) exacerbated malaria virulence and mortality in mice.
    • Inhibition of hepatic bilirubin conjugation (UGT1A1) conferred protection against malaria in mice.
    • Unconjugated bilirubin inhibited Plasmodium falciparum growth in red blood cells by suppressing mitochondrial pyrimidine synthesis.
    • Unconjugated bilirubin disrupted hemozoin crystallization and compromised the parasite's food vacuole.

    Conclusions:

    • Jaundice, characterized by unconjugated bilirubin accumulation, is an adaptive metabolic response to Plasmodium infection.
    • This response limits malaria severity by inhibiting parasite proliferation and disrupting essential parasite processes.