Read by QxMD icon Read

Placental malaria

Rosette Megnekou, Jean Claude Djontu, Benderli C Nana, Jude D Bigoga, Maurice Fotso, Balotin Fogang, Rose F G Leke
BACKGROUND: Plasmodium falciparum infected erythrocytes sequestering in placental tissue release Plasmodium lactate dehydrogenase (pLDH) and histidine-rich protein-II (HRP-II). These proteins can be detected in peripheral blood using monoclonal antibody-based rapid diagnostic tests (RDTs). Nevertheless, studies to evaluate the reliability of RDTs in detecting placental malaria compared with microscopy of placental tissue impression smear (PTIS) as the gold standard are scarce. METHODS: Between August 2013 and January 2015, Giemsa-stained blood smears for peripheral blood smear (Pbs), placental intervillous space (IVS) blood smear and placental tissue impression smear (PTIS)] were prepared from HIV-negative women during delivery at the Marie Reine Medical Health Centre in Yaoundé, Cameroon...
December 4, 2018: Malaria Journal
Raquel González, Clara Pons-Duran, Mireia Piqueras, John J Aponte, Feiko O Ter Kuile, Clara Menéndez
BACKGROUND: The World Health Organization recommends intermittent preventive treatment in pregnancy (IPTp) with sulfadoxine-pyrimethamine for malaria for all women who live in moderate to high malaria transmission areas in Africa. However, parasite resistance to sulfadoxine-pyrimethamine has been increasing steadily in some areas of the region. Moreover, HIV-infected women on cotrimoxazole prophylaxis cannot receive sulfadoxine-pyrimethamine because of potential drug interactions. Thus, there is an urgent need to identify alternative drugs for prevention of malaria in pregnancy...
November 14, 2018: Cochrane Database of Systematic Reviews
Adélaïde Compaoré, Susan Dierickx, Fatou Jaiteh, Alain Nahum, Towanou Francis Emmanuel Bohissou, Halidou Tinto, Susana Scott, Umberto D'Alessandro, Henk Schallig, Koen Peeters Grietens
BACKGROUND: A multi-country, community-based trial on scheduled screening and treatment for malaria in pregnancy was conducted in Benin, The Gambia and Burkina Faso. Despite standardized procedures and outcomes, the study became subject to rumours and accusations of placenta being sold for mystical and financial gain by trial staff, leading to drop-out rates of 30% and the consequent halting of placental biopsy sampling in Benin. This paper explores the role of socio-cultural beliefs related to placenta and identified additional factors contributing these rumours...
November 15, 2018: Malaria Journal
Hamtandi Magloire Natama, Gemma Moncunill, Eduard Rovira-Vallbona, Héctor Sanz, Hermann Sorgho, Ruth Aguilar, Maminata Coulibaly-Traoré, M Athanase Somé, Susana Scott, Innocent Valéa, Petra F Mens, Henk D F H Schallig, Luc Kestens, Halidou Tinto, Carlota Dobaño, Anna Rosanas-Urgell
BACKGROUND: Factors driving inter-individual differences in immune responses upon different types of prenatal malaria exposure (PME) and subsequent risk of malaria in infancy remain poorly understood. In this study, we examined the impact of four types of PME (i.e., maternal peripheral infection and placental acute, chronic, and past infections) on both spontaneous and toll-like receptors (TLRs)-mediated cytokine production in cord blood and how these innate immune responses modulate the risk of malaria during the first year of life...
November 2, 2018: BMC Medicine
Pamela M Odorizzi, Prasanna Jagannathan, Tara I McIntyre, Rachel Budker, Mary Prahl, Ann Auma, Trevor D Burt, Felistas Nankya, Mayimuna Nalubega, Esther Sikyomu, Kenneth Musinguzi, Kate Naluwu, Abel Kakuru, Grant Dorsey, Moses R Kamya, Margaret E Feeney
Malaria remains a significant cause of morbidity and mortality worldwide, particularly in infants and children. Some studies have reported that exposure to malaria antigens in utero results in the development of tolerance, which could contribute to poor immunity to malaria in early life. However, the effector T cell response to pathogen-derived antigens encountered in utero, including malaria, has not been well characterized. Here, we assessed the frequency, phenotype, and function of cord blood T cells from Ugandan infants born to mothers with and without placental malaria...
October 17, 2018: Science Translational Medicine
Rebeca Kawahara, Livia Rosa-Fernandes, Ancély Ferreira Dos Santos, Carla Letícia Bandeira, Jamille G Dombrowski, Rodrigo M Souza, Micaella Pereira da Fonseca, William T Festuccia, Leticia Labriola, Martin R Larsen, Claudio R F Marinho, Giuseppe Palmisano
Malaria in pregnancy is a public health concern in malaria-endemic areas. Accumulation of maternal immune cells in the placenta and increased levels of inflammatory cytokines caused by sequestration of Plasmodium falciparum-infected erythrocytes have been associated to poor neonatal outcomes, including low birth weight due to fetal growth restriction. Little is known about the molecular changes occurring in a P. falciparum-infected placenta that has developed placental malaria during pregnancy but had the parasites cleared by pharmacological treatment (past infection)...
September 21, 2018: Molecular & Cellular Proteomics: MCP
Ayebo Sadoh, Fidelis E Eki-Udoko
INTRODUCTION: Malaria and HIV are vertically transmitted to infants. In an era where specific interventions are available to reduce the burden of malaria in pregnancy and vertical transmission of HIV, we examined the transmission and cotransmission of HIV and malaria to infants of mothers coinfected with malaria and HIV. METHODS: A cross-sectional analytic study performed on 101 HIV/malaria-coinfected mothers and their infants for whom DNA polymerase chain reaction results were available...
October 1, 2018: Journal of Acquired Immune Deficiency Syndromes: JAIDS
Titus H Divala, Randy G Mungwira, Patricia M Mawindo, Osward M Nyirenda, Maxwell Kanjala, Masiye Ndaferankhande, Lufina E Tsirizani, Rhoda Masonga, Francis Muwalo, Gail E Potter, Jessie Kennedy, Jaya Goswami, Blair J Wylie, Atis Muehlenbachs, Lughano Ndovie, Priscilla Mvula, Yamikani Mbilizi, Tamiwe Tomoka, Miriam K Laufer
BACKGROUND: Sulfadoxine-pyrimethamine resistance threatens efficacy of intermittent preventive treatment of malaria during pregnancy, and alternative regimens need to be identified. With the return of chloroquine efficacy in southern Africa, we postulated that chloroquine either as an intermittent therapy or as weekly chemoprophylaxis would be more efficacious than intermittent sulfadoxine-pyrimethamine for prevention of malaria in pregnancy and associated maternal and newborn adverse outcomes...
October 2018: Lancet Infectious Diseases
Tebit E Kwenti
Malaria and HIV, two of the world's most deadly diseases, are widespread, but their distribution overlaps greatly in sub-Saharan Africa. Consequently, malaria and HIV coinfection (MHC) is common in the region. In this paper, pertinent publications on the prevalence, impact, and treatment strategies of MHC obtained by searching major electronic databases (PubMed, PubMed Central, Google Scholar, ScienceDirect, and Scopus) were reviewed, and it was found that the prevalence of MHC in SSA was 0.7%-47.5% overall...
2018: Research and Reports in Tropical Medicine
Okezie Caleb Okamgba, Martin O Ifeanyichukwu, Ayodele O Ilesanmi, Lawrence N Chigbu
Background: Activation of immune cells by malaria infection induces the secretion of cytokines and the synthesis of other inflammatory mediators. This study compared the cytokine levels and leukocyte count between malaria-infected peripheral and placental blood of pregnant women before delivery and postpartum. The cytokines assessed include interferon gamma (IFN-γ), tumor necrosis factor alpha (TNF-α), interleukin-4 (IL-4), interleukin-6 (IL-6) and interleukin-10 (IL-10). Materials and methods: The subjects comprised 144 malaria-infected pregnant women and 60 malaria-infected women at post-partum stage (for placental blood collection)...
2018: Research and Reports in Tropical Medicine
Arnaud Chêne, Stéphane Gangnard, Célia Dechavanne, Sebastien Dechavanne, Anand Srivastava, Marilou Tétard, Sophia Hundt, Odile Leroy, Nicolas Havelange, Nicola K Viebig, Benoît Gamain
Over 50 million women are exposed to the risk of malaria during pregnancy every year. Malaria during pregnancy is a leading global cause of maternal morbidity and adverse pregnancy outcomes. Adhesion of Plasmodium falciparum -infected erythrocytes to placental chondroitin-4-sulfate (CSA) has been linked to the severe disease outcome of placental malaria. Accumulated evidence strongly supports VAR2CSA as the leading placental malaria vaccine candidate. Recombinant proteins encompassing the VAR2CSA high affinity CSA binding site have been generated, and their activity as immunogens that elicit functional (inhibitory) and cross-reactive antibodies against CSA-binding parasites assessed...
2018: NPJ Vaccines
Marc-André Verner, Jonathan Chevrier, Gérard Ngueta, Stephen Rauch, Riana Bornman, Brenda Eskenazi
BACKGROUND: The World Health Organization recommends indoor residual spraying (IRS) of insecticides (including dichlorodiphenyltrichloroethane [DDT]) to fight malaria vectors in endemic countries. There is limited information on children's exposure to DDT in sprayed areas, and tools to estimate early-life exposure have not been thoroughly evaluated in this context. OBJECTIVES: To document serum p,p'-DDT/E levels in 47 mothers and children participating in the Venda Health Examination of Mothers, Babies and their Environment (VHEMBE), a study conducted in an area where IRS insecticides are used annually, and to evaluate the precision and accuracy of a published pharmacokinetic model for the estimation of children's p,p'-DDT/E levels...
October 2018: Environment International
Ana María Vásquez, Lina Zuluaga, Alberto Tobón, Maritza Posada, Gabriel Vélez, Iveth J González, Ana Campillo, Xavier Ding
BACKGROUND: Pregnant women frequently show low-density Plasmodium infections that require more sensitive methods for accurate diagnosis and early treatment of malaria. This is particularly relevant in low-malaria transmission areas, where intermittent preventive treatment is not recommended. Molecular methods, such as polymerase chain reaction (PCR) are highly sensitive, but require sophisticated equipment and advanced training. Instead, loop mediated isothermal amplification (LAMP) provides an opportunity for molecular detection of malaria infections in remote endemic areas, outside a reference laboratory...
July 13, 2018: Malaria Journal
Yukie M Lloyd, Rui Fang, Naveen Bobbili, Koko Vanda, Elise Ngati, Maria J Sanchez-Quintero, Ali Salanti, John J Chen, Rose G F Leke, Diane W Taylor
Plasmodium falciparum infections are serious in pregnant women, because VAR2CSA allows parasitized erythrocytes to sequester in the placenta, causing placental malaria (PM). In areas of endemicity, women have substantial malarial immunity prior to pregnancy, including antibodies to merozoite antigens, but produce antibodies to VAR2CSA only during pregnancy. The current study sought to determine the importance of antibodies to VAR2CSA and merozoite antigens in pregnant women in Yaoundé, Cameroon, where malaria transmission was relatively low...
September 2018: Infection and Immunity
(no author information available yet)
Background: We investigated whether adding community scheduled malaria screening and treatment (CSST) with artemether-lumefantrine by community health workers (CHWs) to standard intermittent preventive treatment in pregnancy with sulfadoxine-pyrimethamine (IPTp-SP) would improve maternal and infant health. Methods: In this 2-arm cluster-randomized, controlled trial, villages in Burkina Faso, The Gambia, and Benin were randomized to receive CSST plus IPTp-SP or IPTp-SP alone...
June 29, 2018: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
Victor Markus, Kerem Teralı, Ozlem Dalmizrak, Nazmi Ozer
Deltamethrin (DEL), which is a synthetic pyrethroid insecticide, has been used successfully all over the world to treat mosquito nets for the control of malaria. Glutathione S-transferases (GSTs; EC catalyze the conjugation of reduced glutathione (GSH) to a variety of xenobiotics and are normally recognized as detoxification enzymes. Here, we used a colorimetric assay based on the human placental GSTP1-1 (hpGSTP1-1)-catalyzed reaction between GSH and the model substrate 1-chloro-2,4-dinitrobenzene (CDNB) as well as molecular docking to investigate the mechanistic and structural aspects of hpGSTP1-1 inhibition by DEL...
July 2018: Environmental Toxicology and Pharmacology
Mary Lopez-Perez, Mads Delbo Larsen, Rafael Bayarri-Olmos, Paulina Ampomah, Liz Stevenson, Myriam Arévalo-Herrera, Sócrates Herrera, Lars Hviid
Clinical immunity to malaria is associated with the acquisition of IgG specific for members of the Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) family of clonally variant antigens on the surface of infected erythrocytes (IEs). The VAR2CSA subtype of PfEMP1 mediates IE binding in the placenta. VAR2CSA-specific IgG is normally acquired only after exposure to placental parasites. However, it was recently reported that men and children from Colombia often have high levels of functional VAR2CSA-specific IgG...
August 2018: Infection and Immunity
Baozhen Zhang, Lunbo Tan, Yan Yu, Baobei Wang, Zhilong Chen, Jinyu Han, Mengxia Li, Jie Chen, Tianxia Xiao, Balamurali K Ambati, Lintao Cai, Qing Yang, Nihar R Nayak, Jian Zhang, Xiujun Fan
Rationale: The availability of therapeutics to treat pregnancy complications is severely lacking, mainly due to the risk of harm to the fetus. In placental malaria, Plasmodium falciparum- infected erythrocytes (IEs) accumulate in the placenta by adhering to chondroitin sulfate A (CSA) on the surfaces of trophoblasts. Based on this principle, we have developed a method for targeted delivery of payloads to the placenta using a synthetic placental CSA-binding peptide (plCSA-BP) derived from VAR2CSA, a CSA-binding protein expressed on IEs...
2018: Theranostics
Alfredo Mayor, Carlota Dobaño, Augusto Nhabomba, Caterina Guinovart, Alfons Jiménez, Maria Nelia Manaca, Ruth Aguilar, Arnoldo Barbosa, Mauricio H Rodríguez, Pau Cisteró, Lazaro M Quimice, Clara Menéndez, John J Aponte, Jaume Ordi, Chetan E Chitnis, Pedro L Alonso
BACKGROUND: Difficulties to disentangle the protective versus exposure role of anti-malarial antibodies hamper the identification of clinically-relevant immune targets. Here, factors affecting maternal IgG and IgMs against Plasmodium falciparum antigens, as well as their relationship with parasite infection and clinical outcomes, were assessed in mothers and their children. Antibody responses among 207 Mozambican pregnant women at delivery against MSP119 , EBA175, AMA1, DBLα and parasite lysate (3D7, R29 and E8B parasite lines), as well as the surface of infected erythrocytes, were assessed by enzyme-linked immunosorbent assay and flow cytometry...
May 10, 2018: Malaria Journal
Carlota Dobaño, Tamara Berthoud, Maria Nelia Manaca, Augusto Nhabomba, Caterina Guinovart, Ruth Aguilar, Arnoldo Barbosa, Penny Groves, Mauricio H Rodríguez, Alfons Jimenez, Lazaro M Quimice, John J Aponte, Jaume Ordi, Denise L Doolan, Alfredo Mayor, Pedro L Alonso
BACKGROUND: Increased susceptibility to malaria during pregnancy is not completely understood. Cellular immune responses mediate both pathology and immunity but the effector responses involved in these processes have not been fully characterized. Maternal and fetal cytokine and chemokine responses to malaria at delivery, and their association with pregnancy and childhood outcomes, were investigated in 174 samples from a mother and child cohort from Mozambique. Peripheral and cord mononuclear cells were stimulated with Plasmodium falciparum lysate and secretion of IL-12p70, IFN-γ, IL-2, IL-10, IL-8, IL-6, IL-4, IL-5, IL-1β, TNF, TNF-β was quantified in culture supernatants by multiplex flow cytometry while cellular mRNA expression of IFN-γ, TNF, IL-2, IL-4, IL-6, IL-10 and IL-13 was measured by quantitative PCR...
May 10, 2018: Malaria Journal
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"