Atypical memory B-cells are associated with Plasmodium falciparum anemia through anti-phosphatidylserine antibodies

Anemia is a common complication of malaria which is characterized by the loss of infected and uninfected erythrocytes. In mice malaria models, clearance of uninfected erythrocytes is promoted by autoimmune anti-phosphatidylserine (PS) antibodies produced by T-bet+B-cells, which bind to exposed PS in erythrocytes, but the mechanism in patients is still unclear. InP. falciparum patients with anemia, we show that atypical memory FcRL5+T-bet+B-cells are expanded and associate with higher levels of anti-PS antibodies in plasma and with the development of anemia in these patients. No association of anti-PS antibodies or anemia with other B-cell subsets or of other antibody specificities with FcRL5+T-bet+B-cells is observed, revealing high specificity in this response. We also identify FcRL5+T-bet+B-cells as producers of anti-PS antibodies inex vivo cultures of naive human PBMC stimulated withP. falciparum-infected erythrocyte lysates. These data define a crucial role for atypical memory B-cells and anti-PS autoantibodies in human malarial anemia.
Source: eLife - Category: Biomedical Science Tags: Immunology and Inflammation Source Type: research

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CONCLUSIONS: In areas of sub-Saharan Africa, giving antimalarial drugs known to be effective against the malaria parasite at the time to infants as IPT probably reduces the risk of clinical malaria, anaemia, and hospital admission. Evidence from SP studies over a 19-year period shows declining efficacy, which may be due to increasing drug resistance. Combinations with ACTs appear promising as suitable alternatives for IPTi. 2 December 2019 Up to date All studies incorporated from most recent search All eligible published studies found in the last search (3 Dec, 2018) were included. PMID: 31792925 [PubMed - in process]
Source: Cochrane Database of Systematic Reviews - Category: General Medicine Authors: Tags: Cochrane Database Syst Rev Source Type: research
Abstract To implement future malaria elimination strategies in French Guiana, a characterization of the infectious reservoir is recommended. A cross-sectional survey was conducted between October and December 2017 in the French Guianese municipality of St Georges de l'Oyapock, located along the Brazilian border. The prevalence of Plasmodium spp. was determined using a rapid diagnostic test (RDT) and a polymerase chain reaction (PCR). Demographic, house locations, medical history, and biological data were analyzed. Factors associated with Plasmodium spp. carriage were analyzed using logistic regression, and the car...
Source: The American Journal of Tropical Medicine and Hygiene - Category: Tropical Medicine Authors: Tags: Am J Trop Med Hyg Source Type: research
AbstractBackgroundAnaemia and malaria are common and life-threatening diseases among preschool-aged children in many tropical and subtropical areas, and Malawi is no exception. Accordingly, this study aimed to examine the association of referral clinical malaria with anemia (hemoglobin [Hb]  
Source: Infectious Diseases of Poverty - Category: Infectious Diseases Source Type: research
In conclusion, while travelling to endemic countries, people should be informed about the importance of malaria prophylaxis and prophylaxis should be commenced immediately and continued appropriately. Additionally, malaria should always be considered in the differential diagnosis of high fever for the patients who admitted to the hospital with a travelling history to these countries. PMID: 31709945 [PubMed - in process]
Source: Mikrobiyoloji Bulteni - Category: Microbiology Tags: Mikrobiyol Bul Source Type: research
(eLife) An autoimmune attack on uninfected red blood cells likely contributes to anaemia -- a shortage of red blood cells -- in people with malaria, according to a new study published in eLife.
Source: EurekAlert! - Infectious and Emerging Diseases - Category: Infectious Diseases Source Type: news
Conclusions: Severe malaria is a highly frequent event in pregnant women, without differences by Plasmodium species. It shows early recognizable dangers signs. Hospital under-reporting was identified in 88% of severe cases as well as a lack of laboratory tests for a more comprehensive diagnosis. A protocol for the clinical diagnosis of pregnant women with malaria is required. PMID: 31529822 [PubMed - in process]
Source: Biomedica : Revista del Instituto Nacional de Salud - Category: International Medicine & Public Health Tags: Biomedica Source Type: research
Abstract Coinfection with malaria and soil-transmitted helminths (STHs) has been common among school-aged children in Tanzania. However, after a countrywide scaling up of interventions for malaria and STHs, there are limited data on the prevalence of malaria-STH coinfection and its effect on anemia in schoolchildren in Tanzania. We assessed the distribution and risk factors for malaria, STHs, and malaria-STH coinfection, and its relation to anemia among 445 primary schoolchildren in Muheza district. A semi-structured questionnaire was used to collect demographic characteristics of the children. Malaria rapid diagn...
Source: The American Journal of Tropical Medicine and Hygiene - Category: Tropical Medicine Authors: Tags: Am J Trop Med Hyg Source Type: research
Authors: Omer SA, Noureldein AN, Eisa H, Abdelrahim M, Idress HE, Abdelrazig AM, Adam I Abstract The aim of the present study was to investigate the prevalence of submicroscopic infections and to assess its impact on maternal anaemia and low birth weight. A cross-sectional study was carried out with 1149 consented pregnant women who delivered at 3 main hospitals in the Blue Nile State, between January 2012 and December 2015. From a matched maternal peripheral, placental maternal side, and cord blood sample, blood films and dried spots were prepared for microscopic examination and nested polymerase chain reaction (n...
Source: Journal of Tropical Medicine - Category: Tropical Medicine Tags: J Trop Med Source Type: research
Purpose of review Malaria threatens the lives of over 200 million individuals with the disease each year. Plasmodium falciparum is the predominant cause of severe malaria which may be lethal and result in neurocognitive sequelae despite appropriate treatment. We review recent advances regarding the pathophysiology of severe malaria and treatment recommendations for severe disease in the United States. Recent findings Infected red blood cell (iRBC) sequestration in microvascular beds is a critical factor in the development of severe malaria syndromes. Interactions between iRBC variant adhesive peptides and the endothel...
Source: Current Opinion in Infectious Diseases - Category: Infectious Diseases Tags: TROPICAL AND TRAVEL-ASSOCIATED DISEASES: Edited by Christina Coyle Source Type: research
Infection during pregnancy with Plasmodium falciparum is associated with maternal anaemia and adverse birth outcomes including low birth weight (LBW). Studies using polymerase chain reaction (PCR) techniques indi...
Source: Malaria Journal - Category: Infectious Diseases Authors: Tags: Research Source Type: research
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