Patterns of Mannose-Binding Lectin (MBL) responses to Plasmodium falciparum infections in hyperendemic settings


Submitted: 12 June 2023
Accepted: 28 September 2023
Published: 7 December 2023
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Background: malaria caused by Plasmodium falciparum remains a significant and major public health concern in Africa, particularly in hyperendemic regions. Recurrent fevers and high quantities of inflammatory mediators in the circulation define the disease's blood stages. By binding to non-self-pathogen oligosaccharide surfaces, Mannose-Binding Lectin (MBL) and lectin complement pathways trigger innate immune processes and contribute to the formation of adaptive immune responses. Methods: in Sudan, we investigated the varied immune response levels of MBL to the different phases of P. falciparum infection in White Nile and Blue Nile states endemic to malaria. And we looked at the interaction of regulatory Interleukin 6 (IL- 6) cytokines on MBL during infection. Our study was based on a total of 108 cases, in which 86 patients (62.0%) were uncomplicated and (17.6%) were severe, all met the diagnostic criteria and were clinically admitted for malaria infections. For the determination of serum MBL and IL-6 levels, a commercial ELISA kit was employed. Results: the analysis of the results revealed significantly elevated levels of MBL and IL-6 in both severe and uncomplicated cases (p<0.001). And MBL average in contrast to residents, Blue Nile patients had high parasitemia (599.9 ng/mL) and this difference was statistically significant (p-value<0.05). The remarkable positive correlation of IL-6 serum levels with MBL among malaria patients and healthy controls (r=0.399, p<0.001) was noted too. Conclusions: according to the findings of this study, patients living in hyperendemic areas exhibit a different MBL response rate and appear to be more homogeneous in proportion to the density of P. falciparum due to parasitemia. In addition, it is also dependent on the regulatory immune mediator IL-6.


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