Advanced Biomedical Research

Pro-inflammatory Cytokine Response and Genetic Diversity in Merozoite Surface Protein 2 of Plasmodium falciparum Isolates from Nigeria

Authors

1 Biochemistry and Nutrition Division, Nigerian Institute of Medical Research; Department of Biochemistry, College of Medicine, University of Lagos, Lagos, Nigeria

2 Department of Biochemistry, College of Medicine, University of Lagos, Lagos, Nigeria

3 Biochemistry and Nutrition Division, Nigerian Institute of Medical Research, Lagos, Nigeria

4 Department of Biomedical Chemistry, Graduate School of Medicine, University of Tokyo, Tokyo 113-0033, Japan; Department of Biochemistry, Ahmadu Bello University, Zaria 2222, Nigeria

Abstract

Background: Polymorphisms in Plasmodium falciparum merozoite surface protein-2 (msp-2) and associated parasite genetic diversity which varies between malaria-endemic regions remain a limitation in malaria vaccine development. Pro-inflammatory cytokines are important in immunity against malaria, understanding the influence of genetic diversity on cytokine response is important for effective vaccine design. Methods: P. falciparum isolates obtained from 300 Nigerians with uncomplicated falciparum malaria at Ijede General Hospital, Ijede (IJE), General Hospital Ajeromi, Ajeromi (AJE) and Saint Kizito Mission Hospital, Lekki, were genotyped by nested polymerase chain reaction of msp-2 block 3 while ELISA was used to determine the pro-inflammatory cytokine response to describe the genetic diversity of P. falciparum. Results: Eighteen alleles were observed for msp-2 loci. Of the 195 isolates, 61 (31.0%) had only FC27-type alleles, 38 (19.7%) had only 3D7-type alleles, and 49.3% had multiple parasite lines with both alleles. Band sizes were 275–625 bp for FC27 and 150–425 bp for 3D7. Four alleles were observed from LEK, 2 (375–425 bp) and 2 (275–325 bp) of FC27-and 3D7-types, respectively; 12 alleles from AJE, 9 (275–625 bp) and 3 (325–425 bp) of FC27-types and 3D7-types, respectively; while IJE had a total of 12 alleles, 9 (275–625 bp) and 3 (325–425 bp) of FC27-types and 3D7-types, respectively. Mean multiplicity of infection (MOI) was 1.54. Heterozygosity (HE) ranged from 0.77 to 0.87 and was highest for IJE (0.87). Cytokine response was higher among <5 years and was significantly associated with MOI (P > 0.05) but with neither parasite density nor infection type. Conclusion: P. falciparum genetic diversity is extensive in Nigeria, protection via pro-inflammatory cytokines have little or no interplay with infection multiplicity

Keywords

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Advanced Biomedical Research
Volume 2017, November
November 2017
Pages 1-7