IgG isotypic antibodies to crude Plasmodium falciparum blood-stage antigen associated with placental malaria infection in parturient Cameroonian women

Background: Few studies have reported an association between placental malaria (PM) infection and levels of isotypic antibodies against non-pregnancy associated antigens. Objective: To determine and evaluate IgG isotypic antibody levels to crude P. falciparum blood stage in women with and without PM infection. Methods: Levels of IgG (IgG1-IgG4) and IgM to crude P. falciparum blood stage antigen were measured by ELISA in 271 parturient women. Placental malaria infection was determined by placental blood microscopy and placental histology. Age, parity and intermittent preventive treatment during pregnancy with sulphadoxine-pyrimethamine (IPTp-SP) usage were considered during analysis. Results: P. falciparum-specific IgG1 (96.5%) and IgG3 (96.7%) antibodies were predominant compared with IgG2 (64.6%) and IgG4 (49.1%). Active PM infection was associated with significant increased levels of IgG1, IgG4 and IgM while lower levels of these antibodies were associated with uptake of two or more IPTp-SP doses. PM infection was the only independent factor associated with IgG4 levels. Mean IgG1 + IgG3/IgG2 + IgG4 and IgG1 + IgG2 + IgG3/IgG4 ratios were higher among the PM-uninfected group while IgG4/IgG2 ratio prevailed in the infected group. Conclusion: PM infection and IPTp-SP dosage influenced P. falciparum-specific isotypic antibody responses to blood stage antigens. An increase in IgG4 levels in response to PM infection is of particular interest.

Achidi, Eric Akum (author)
Nkegoum, Blaise (author)
Mendimi, Joseph-Marie N. (author)
Sverremark-Ekström, EvaStockholms universitet,Institutionen för molekylär biovetenskap, Wenner-Grens institut(Swepub:su)esver (author)
Troye-Blomberg, MaritaStockholms universitet,Institutionen för molekylär biovetenskap, Wenner-Grens institut(Swepub:su)marita (author)
Stockholms universitetInstitutionen för molekylär biovetenskap, Wenner-Grens institut (creator_code:org_t)

In:African Health Sciences: African Journals Online (AJOL)16:4, s. 1007-10171680-69051729-0503

By the author/editor: Anchang-Kimbi, J ...; Achidi, Eric Aku ...; Nkegoum, Blaise; Mendimi, Joseph- ...; Sverremark-Ekstr ...; Troye-Blomberg, ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Immunology

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Health Sciences; and Public Health Gl ...

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