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Lv Y, Wu S, Nie Q, Liu S, Xu W, Chen G, Du Y, Chen J. Extracellular vesicles derived from plasmodium-infected red blood cells alleviate cerebral malaria in plasmodium berghei ANKA-infected C57BL/6J mice. Int Immunopharmacol 2024; 132:111982. [PMID: 38569430 DOI: 10.1016/j.intimp.2024.111982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Revised: 03/15/2024] [Accepted: 03/28/2024] [Indexed: 04/05/2024]
Abstract
RTS,S is the first malaria vaccine recommended for implementation among young children at risk. However, vaccine efficacy is modest and short-lived. To mitigate the risk of cerebral malaria (CM) among children under the age of 5, it is imperative to develop new vaccines. EVs are potential vaccine candidates as they obtain the ability of brain-targeted delivery and transfer plasmodium antigens and immunomodulators during infections. This study extracted EVs from BALB/c mice infected with Plasmodium yoelii 17XNL (P.y17XNL). C57BL/6J mice were intravenously immunized with EVs (EV-I.V. + CM group) or subcutaneously vaccinated with the combination of EVs and CpG ODN-1826 (EV + CPG ODN-S.C. + CM group) on days 0 and 20, followed by infection with Plasmodium berghei ANKA (P.bANKA) on day 20 post-second immunization. We monitored Parasitemia and survival rate. The integrity of the Blood-brain barrier (BBB) was examined using Evans blue staining.The levels of cytokines and adhesion molecules were evaluated using Luminex, RT-qPCR, and WB. Brain pathology was evaluated by hematoxylin and eosin and immunohistochemical staining. The serum levels of IgG, IgG1, and IgG2a were analyzed by enzyme-linked immunosorbent assay. Compared with those in the P.bANKA-infected group, parasitemia increased slowly, death was delayed (day 10 post-infection), and the survival rate reached 75 %-83.3 % in the EV-I.V. + ECM and EV + CPG ODN-S.C. + ECM groups. Meanwhile, compared with the EV + CPG ODN-S.C. + ECM group, although parasitemia was almost the same, the survival rate increased in the EV-I.V. + ECM group.Additionally, EVs immunization markedly downregulated inflammatory responses in the spleen and brain and ameliorated brain pathological changes, including BBB disruption and infected red blood cell (iRBC) sequestration. Furthermore, the EVs immunization group exhibited enhanced antibody responses (upregulation of IgG1 and IgG2a production) compared to the normal control group. EV immunization exerted protective effects, improving the integrity of the BBB, downregulating inflammation response of brain tissue, result in reduces the incidence of CM. The protective effects were determined by immunological pathways and brain targets elicited by EVs. Intravenous immunization exhibited better performance than subcutaneous immunization, which perhaps correlated with EVs, which can naturally cross BBB to play a better role in brain protection.
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Affiliation(s)
- Yinyi Lv
- Taizhou Central Hospital (Taizhou University Hospital), Taizhou University, No 1139 Shifu Road, Jiaojiang District, Taizhou 318000, China
| | - Shuang Wu
- Taizhou Central Hospital (Taizhou University Hospital), Taizhou University, No 1139 Shifu Road, Jiaojiang District, Taizhou 318000, China
| | - Qing Nie
- Weifang Centers for Disease Control and Prevention, No 4801 Huixian Road, Gaoxin Distric, Weifang 261061, Shandong Province, China
| | - Shuangchun Liu
- Municipal Hospital Affiliated to Medical School of Taizhou University, No 381, Zhongshan East Road, Jiaojiang District, Taizhou 318000, China
| | - Wenxin Xu
- Taizhou Central Hospital (Taizhou University Hospital), Taizhou University, No 1139 Shifu Road, Jiaojiang District, Taizhou 318000, China
| | - Guang Chen
- Taizhou Central Hospital (Taizhou University Hospital), Taizhou University, No 1139 Shifu Road, Jiaojiang District, Taizhou 318000, China.
| | - Yunting Du
- Department of Laboratory Medicine, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, NO. 44 Xiaoheyan Road, Dadong District, Shenyang 110042, China.
| | - Jinguang Chen
- Taizhou Central Hospital (Taizhou University Hospital), Taizhou University, No 1139 Shifu Road, Jiaojiang District, Taizhou 318000, China.
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Sady H, Chaima D, Hallamaa L, Kortekangas E, Ashorn U, Banda J, Mangani C, Maleta K, Ashorn P, Fan YM. Effect of dietary intervention on the prevalence of asymptomatic malaria among 6-18-month-old children in rural Malawi. Malar J 2023; 22:266. [PMID: 37697296 PMCID: PMC10496296 DOI: 10.1186/s12936-023-04701-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Accepted: 09/01/2023] [Indexed: 09/13/2023] Open
Abstract
BACKGROUND The complex interaction between malaria and undernutrition leads to increased mortality and morbidity rate among young children in malaria-endemic regions. Results from previous interventions suggest that improving nutritional status of young children may reduce the burden of malaria. This study tested a hypothesis that provision of lipid-based nutrient supplements (LNS) or corn-soy blend (CSB) supplementation to 6-18-month-old children in Malawi would reduce the prevalence of asymptomatic malaria among them. METHODS A total of 840 6-month-old children were enrolled in a randomized trial. The participants received 12-month supplementation with three different daily dietary supplementations: CSB, soy-LNS, or milk-LNS, and one control group without supplementation. The prevalence rate of asymptomatic Plasmodium falciparum was determined by real-time PCR from the participant's dried blood spots (DBS) collected at the baseline and every 3 months. The global null hypothesis was tested using modified Poisson regression to estimate the prevalence ratio (PR) between the control group and three intervention groups at all ages combined. All the models were adjusted for malaria at baseline, season of DBS sample collection, site of enrolment, and household asset Z-score. RESULTS All children combined, the prevalence of P. falciparum was 14.1% at enrollment, 8.7% at 9 months, 11.2% at 12 months, 13.0% at 15 months and 22.4% at 18 months of age. Among all samples that were taken after enrolment, the prevalence was 12.1% in control group, 12.2% in milk-LNS, 14.0% in soy-LNS, and 17.2% in CSB group. Compared to children in the control group the prevalence ratio of positive malaria tests was 1.19 (95% CI 0.81-1.74; P = 0.372) in the milk-LNS group, 1.32 (95% CI 0.88-1.96; P = 0.177) in the soy-LNS group and 1.72 (95% CI 1.19-2.49; P = 0.004) in the CSB group. CONCLUSION The study findings do not support a hypothesis that LNS or CSB supplementation would reduce the prevalence of asymptomatic malaria among Malawian children. In contrast, there was a signal of a possible increase in malaria prevalence among children supplemented with CSB.
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Affiliation(s)
- Hany Sady
- Center for Child, Adolescent and Maternal Health Research, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön Katu 34, 33014, Tampere, Finland.
- Faculty of Medicine and Health Sciences, Hodeidah University, Hodeidah, Yemen.
| | - David Chaima
- Kamuzu University of Health Sciences, Blantyre, Malawi
| | - Lotta Hallamaa
- Center for Child, Adolescent and Maternal Health Research, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön Katu 34, 33014, Tampere, Finland
| | - Emma Kortekangas
- Center for Child, Adolescent and Maternal Health Research, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön Katu 34, 33014, Tampere, Finland
| | - Ulla Ashorn
- Center for Child, Adolescent and Maternal Health Research, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön Katu 34, 33014, Tampere, Finland
| | - Jomo Banda
- Kamuzu University of Health Sciences, Blantyre, Malawi
| | | | | | - Per Ashorn
- Center for Child, Adolescent and Maternal Health Research, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön Katu 34, 33014, Tampere, Finland
- Department of Paediatrics, Tampere University Hospital, Tampere, Finland
| | - Yue-Mei Fan
- Center for Child, Adolescent and Maternal Health Research, Faculty of Medicine and Health Technology, Tampere University, Arvo Ylpön Katu 34, 33014, Tampere, Finland
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Kalantari N, Sepidarkish M, Ghaffari S, Rostami-Mansoor S. Does vitamin D reduce the mortality rate of Plasmodium infection?: a systematic review and meta-analysis. Malar J 2023; 22:173. [PMID: 37277818 DOI: 10.1186/s12936-023-04612-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Accepted: 05/30/2023] [Indexed: 06/07/2023] Open
Abstract
BACKGROUND Vitamin D supplementation is recommended as an effective adjunct to counteract malaria pathogenesis, but the evidence on this point is limited and controversial. This systematic review and meta-analysis aimed to investigate the effect of vitamin D administration on the survival rate of Plasmodium-infected animals in experimentally-induced malaria on days 6 and 10 post-infection. METHODS Five electronic databases were searched up to 20 December 2021. The pooled risks ratio (RR) and associated 95% confidence interval were estimated using the Restricted-maximum likelihood (REML) random-effects model. Heterogeneity was assessed by Cochran's Q test and I2 value. Sub-group analyses were used to identify the sources of heterogeneity for several variables, such as type of vitamin D, type of intervention, and dose of vitamin D. RESULTS Out of 248 articles found in the electronic database, six were eligible for inclusion in the meta-analysis. The current study found that the pooled random effect of risks ratio favored a statistically significant effect of vitamin D administration on survival rate in infected mice on day 6 post Plasmodium infection (RR = 1.08, 95%CI 1.03, 1.15, p < 0.99; I2 = 0%). It also found that vitamin D administration significantly affected the survival rate on day 10 post-infection (RR = 1.94, 95%CI 1.39, 2.71, p < 0.001; I2 = 69.02%). Subgroup analyses demonstrated a significant pooled RRs of the positive effect of vitamin D administration for cholecalciferol (RR = 3.11, 95%CI 2.41, 4.03, p < 0.001; I2 = 0%), doses higher than 50 µg/kg (RR = 3.37, 95%CI 2.55, 4.27, p < 0.001; I2 = 0%), and oral administration (RR = 3.01, 95%CI 2.37, 3.82, p < 0.001; I2 = 0%). CONCLUSION This systematic review and meta-analysis showed that vitamin D administration positively affects the survival rate in Plasmodium-infected mice. Since, the mouse model may not accurately reproduce the clinical and pathological features of human malaria, future research should investigate the impact of vitamin D in human malaria.
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Affiliation(s)
- Narges Kalantari
- Cellular and Molecular Biology Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
| | - Mahdi Sepidarkish
- Department of Biostatistics and Epidemiology, School of Public Health, Babol University of Medical Sciences, Babol, Iran
| | - Salman Ghaffari
- Department of Mycology and Parasitology, School of Medicine, Babol University of Medical Sciences, Babol, Iran
| | - Sahar Rostami-Mansoor
- Cellular and Molecular Biology Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran.
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Saad AE, Othman AA, Ghanem HB, Soliman S, Alshenawy HA, Ghafar MTA, Rayia DMA. Vitamin D3 supplementation could ameliorate the inflammatory and redox status in the muscular phase of trichinellosis. Parasitol Int 2023; 94:102737. [PMID: 36736658 DOI: 10.1016/j.parint.2023.102737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 01/25/2023] [Accepted: 01/29/2023] [Indexed: 02/04/2023]
Abstract
Nutritional supplements, particularly vitamin D, have been widely used worldwide in the treatment of various infections, including parasites. This study aimed to evaluate the potential effects of vitamin D3 supplementation on the muscular phase of trichinellosis in experimental animals. Mice were divided as follows: (group I): infected untreated, (group IIa) infected and treated with vitamin D3 for 12 doses beginning 2 weeks before infection and continuing after infection, (group IIb) infected and treated with vitamin D3 for 8 doses beginning on the same day of infection, (group III) normal control, (group IVa) which received vitamin D3 for 12 doses and (group IVb) which received vitamin D3 for 8 doses. Mice were sacrificed 35 days after infection and total muscle larval count, and histopathological examination of muscle samples with immunohistochemical staining of cyclooxygenase 2 (COX2) and inducible nitric oxide synthase (iNOS) were performed. Muscle relative cathelicidin mRNA expression was assessed, as well as serum levels of muscle enzymes CK and LDH, interleukin-4 (IL-4), IL-10, IL-17 and interferon-gamma (INF-γ). Vitamin D3 supplementation significantly reduced muscle larval count, inflammatory cellular infiltration, COX2 and iNOS expression. Furthermore, it increased cathelicidin gene expression, decreased serum levels of CK and LDH and affected serum cytokine levels, increasing serum IL-4 and IL10 levels while decreasing serum INF γ and IL-17. In conclusion, vitamin D3 supplementation has favorable outcomes on the muscle phase of trichinellosis, including anti-inflammatory, antioxidant, and immunomodulatory effects.
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Affiliation(s)
- Abeer Ezzat Saad
- Medical Parasitology Department, Faculty of Medicine, Tanta University, Egypt.; Medical Parasitology Sub-Unit, Pathology Department, College of Medicine, Jouf University, Sakaka, Saudi Arabia
| | - Ahmad Aly Othman
- Medical Parasitology Department, Faculty of Medicine, Tanta University, Egypt
| | - Heba Bassiony Ghanem
- Clinical Laboratory Sciences Department, College of Applied Medical Sciences, Jouf University, Sakaka, Saudi Arabia; Medical Biochemistry Department, Faculty of Medicine, Tanta University, Egypt
| | - Shaimaa Soliman
- Public Health, Biostatistics and Community Medicine Department, Faculty of Medicine, Menoufia University, Egypt
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Chen G, Liu SC, Fan XY, Jin YL, Li X, Du YT. Plasmodium manipulates the expression of host long non-coding RNA during red blood cell intracellular infection. Parasit Vectors 2022; 15:182. [PMID: 35643541 PMCID: PMC9148527 DOI: 10.1186/s13071-022-05298-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 04/26/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Parasites interact with their host through "direct" and/or "indirect" mechanisms. Plasmodium, for example, either mediates direct physical interactions with host factors or triggers the immune system of the host indirectly, leading to changes in infectious outcomes. Long non-coding RNAs (lncRNAs) participate in regulating biological processes, especially host-pathogen interactions. However, research on the role of host lncRNAs during Plasmodium infection is limited. METHODS A RNA sequencing method (RNA-seq) was used to confirm the differential expression profiles of lncRNAs in Plasmodium yeolii 17XL (P.y17XL)-infected BALB/c mice. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analyses were performed to elucidate the potential functions of Plasmodium-induced genes. Subsequently, the effect of specific lncRNAs on the modulation of immune-related signaling pathways in malaria was determined by fluorescence-activated cell sorting, western blot and enzyme-linked immunosorbent assay. RESULTS The data showed that in P.y17XL-infected BALB/c mice, Plasmodium upregulated the expression of 132 lncRNAs and downregulated the expression of 159 lncRNAs. Differentially expressed lncRNAs clearly associated with malaria infection were annotated, including four novel dominant lncRNAs: ENMSUSG00000111521.1, XLOC_038009, XLOC_058629 and XLOC_065676. GO and KEGG pathway analyses demonstrated that these four differentially expressed lncRNAs were associated with co-localized/co-expressed protein-coding genes that were totally enriched in malaria and with the transforming growth factor beta (TGF-β) signaling pathway. Using the models of P.y17XL-infected BALB/c mice, data certified that the level of TGF-β production and activation of TGF-β/Smad2/3 signaling pathway were obviously changed in malaria infection. CONCLUSIONS These differentially expressed immune-related genes were deemed to have a role in the process of Plasmodium infection in the host via dendritic/T regulatory cells and the TGF-β/Smad2/3 signaling pathway. The results of the present study confirmed that Plasmodium infection-induced lncRNA expression is a novel mechanism used by Plasmodium parasites to modify host immune signaling. These results further enhance current understanding of the interaction between Plasmodium and host cells.
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Affiliation(s)
- Guang Chen
- Department of Basic Medical Sciences, Taizhou University, No. 1139 Shifu Road, Jiaojiang District, Taizhou, 318000, China
| | - Shuang-Chun Liu
- Municipal Hospital Affiliated to Medical School of Taizhou University, No. 381, Zhongshan East Road, Jiaojiang District, Taizhou, 318000, China
| | - Xiao-Yan Fan
- Department of Basic Medical Sciences, Taizhou University, No. 1139 Shifu Road, Jiaojiang District, Taizhou, 318000, China
| | - Yue-Lei Jin
- Department of Basic Medical Sciences, Taizhou University, No. 1139 Shifu Road, Jiaojiang District, Taizhou, 318000, China
| | - Xin Li
- Department of Basic Medical Sciences, Taizhou University, No. 1139 Shifu Road, Jiaojiang District, Taizhou, 318000, China
| | - Yun-Ting Du
- Department of Laboratory Medicine, Cancer Hospital of China Medical University-Liaoning Cancer Hospital & Institute, No. 44 Xiaoheyan Road, Dadong District, Shenyang, 110042, China.
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Gomes ARQ, Cunha N, Varela ELP, Brígido HPC, Vale VV, Dolabela MF, de Carvalho EP, Percário S. Oxidative Stress in Malaria: Potential Benefits of Antioxidant Therapy. Int J Mol Sci 2022; 23:ijms23115949. [PMID: 35682626 PMCID: PMC9180384 DOI: 10.3390/ijms23115949] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 05/17/2022] [Accepted: 05/19/2022] [Indexed: 01/07/2023] Open
Abstract
Malaria is an infectious disease and a serious public health problem in the world, with 3.3 billion people in endemic areas in 100 countries and about 200 million new cases each year, resulting in almost 1 million deaths in 2018. Although studies look for strategies to eradicate malaria, it is necessary to know more about its pathophysiology to understand the underlying mechanisms involved, particularly the redox balance, to guarantee success in combating this disease. In this review, we addressed the involvement of oxidative stress in malaria and the potential benefits of antioxidant supplementation as an adjuvant antimalarial therapy.
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Affiliation(s)
- Antonio Rafael Quadros Gomes
- Post-Graduate Program in Pharmaceutica Innovation, Institute of Health Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil; (A.R.Q.G.); (H.P.C.B.); (V.V.V.); (M.F.D.)
- Oxidative Stress Research Laboratory, Institute of Biological Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil; (N.C.); (E.L.P.V.); (E.P.d.C.)
| | - Natasha Cunha
- Oxidative Stress Research Laboratory, Institute of Biological Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil; (N.C.); (E.L.P.V.); (E.P.d.C.)
| | - Everton Luiz Pompeu Varela
- Oxidative Stress Research Laboratory, Institute of Biological Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil; (N.C.); (E.L.P.V.); (E.P.d.C.)
- Post-graduate Program in Biodiversity and Biotechnology (BIONORTE), Institute of Biological Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil
| | - Heliton Patrick Cordovil Brígido
- Post-Graduate Program in Pharmaceutica Innovation, Institute of Health Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil; (A.R.Q.G.); (H.P.C.B.); (V.V.V.); (M.F.D.)
| | - Valdicley Vieira Vale
- Post-Graduate Program in Pharmaceutica Innovation, Institute of Health Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil; (A.R.Q.G.); (H.P.C.B.); (V.V.V.); (M.F.D.)
| | - Maria Fâni Dolabela
- Post-Graduate Program in Pharmaceutica Innovation, Institute of Health Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil; (A.R.Q.G.); (H.P.C.B.); (V.V.V.); (M.F.D.)
- Post-graduate Program in Biodiversity and Biotechnology (BIONORTE), Institute of Biological Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil
| | - Eliete Pereira de Carvalho
- Oxidative Stress Research Laboratory, Institute of Biological Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil; (N.C.); (E.L.P.V.); (E.P.d.C.)
- Post-graduate Program in Biodiversity and Biotechnology (BIONORTE), Institute of Biological Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil
| | - Sandro Percário
- Oxidative Stress Research Laboratory, Institute of Biological Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil; (N.C.); (E.L.P.V.); (E.P.d.C.)
- Post-graduate Program in Biodiversity and Biotechnology (BIONORTE), Institute of Biological Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil
- Correspondence:
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OUP accepted manuscript. J Pharm Pharmacol 2022; 74:800-811. [DOI: 10.1093/jpp/rgac003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 02/01/2022] [Indexed: 11/13/2022]
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Affiliation(s)
- Geoffrey Guenther
- Department of Pediatrics, Children's National Hospital, Washington, DC, USA
| | - Daniel Muller
- The George Washington University School of Medicine and Health Sciences, Washington, DC, USA
| | - Dominic Moyo
- Department of Paediatric and Child Health, University of Malawi College of Medicine, Blantyre, Malawi
| | - Douglas Postels
- Department of Pediatric Neurology, George Washington University/ Children's National Medical Center; Washington DC, USA; Blantyre Malaria Project; Blantyre, Malawi, Street Address: Department of Neurology; 111 Michigan Avenue NW; Washington DC; 20010; USA
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Meireles P, Brás D, Fontinha D, Chora ÂF, Serre K, Mendes AM, Prudêncio M. Elimination of Hepatic Rodent Plasmodium Parasites by Amino Acid Supplementation. iScience 2020; 23:101781. [PMID: 33294789 PMCID: PMC7689548 DOI: 10.1016/j.isci.2020.101781] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 10/16/2020] [Accepted: 11/04/2020] [Indexed: 12/12/2022] Open
Abstract
Plasmodium parasites, causative agents of malaria, scavenge host nutrients to sustain their intracellular replication. Modulation of the host's nutritional status can potentially help control infection by limiting the parasite's access to nutrients, or by boosting the immune system. Here, we show that dietary supplementation of mice employing a combination of arginine (R) with two additional amino acids, lysine (K) and valine (V), termed RKV, significantly decreases Plasmodium liver infection. RKV supplementation results in the elimination of parasites at a late stage of their development in the liver. Our data employing genetic knockout mouse models and in vivo depletion of specific cell populations suggest that RKV supplementation boosts the host's overall innate immune response, and that parasite elimination is dependent on MyD88 signaling in immune cells. The immunostimulatory effect of RKV supplementation opens a potential role for dietary supplementation as an adjuvant for prophylaxis or immunization strategies against Plasmodium infection.
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Affiliation(s)
- Patrícia Meireles
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - Daniela Brás
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - Diana Fontinha
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - Ângelo F Chora
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - Karine Serre
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - António M Mendes
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - Miguel Prudêncio
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
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Chen G, Du YT, Liu JH, Li Y, Zheng L, Qin XS, Cao YM. Modulation of anti-malaria immunity by vitamin A in C57BL/6J mice infected with heterogenic plasmodium. Int Immunopharmacol 2019; 76:105882. [PMID: 31520991 DOI: 10.1016/j.intimp.2019.105882] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 09/02/2019] [Accepted: 09/04/2019] [Indexed: 12/12/2022]
Abstract
Vitamin A (VA) is an anti-inflammatory agent that is important in modulating and balancing the immune system. The present study aimed to investigate the immunoregulatory effects of vitamin A supplement (VAS) in C57BL/6J mice infected with Plasmodium yoelii 17XL (P.y17XL) or Plasmodium berghei ANKA (P.bANKA). Following VA treatment, parasitaemia decreased, but survival rate did not significantly change during P.y17XL infection. However, in P.bANKA infected C57BL/6J mice, VA pretreatment decreased parasitaemia, and a lag in cerebral malaria (CM) was observed during the early stages of infection. Furthermore, VA pretreatment was also demonstrated to upregulate MHCII expression in dendritic cells (DCs), downregulate Th1 and Tregs, and downregulate TNF-α and IFN-γ production. The results of the current study indicated that VAS downregulated the inflammation response in CM, but did not exhibit an immunoregulatory effect against P.y17XL infection. VAS protected the onset of CM by reducing inflammation, and was also correlated with the downregulation of Th1 by modifying the function of DCs and Tregs. However, no significant effect was observed during P.y17XL infection.
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Affiliation(s)
- Guang Chen
- Department of Basic Medical Sciences, Taizhou University Hospital, Taizhou University, No 1139 Shifu Road, Jiaojiang District, Taizhou 318000, China; Department of Immunology, College of Basic Medical Sciences, China Medical University, Shenyang 110013, China
| | - Yun-Ting Du
- Department of Immunology, College of Basic Medical Sciences, China Medical University, Shenyang 110013, China; Department of Clinical Lab, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, Number 44 Xiaoheyan Road, Dadong District, Shenyang 110042, China
| | - Jian-Hua Liu
- Department of Laboratory Medicine, Shengjing Hospital of China Medical University, Shenyang 110004, China
| | - Ying Li
- Department of Laboratory Medicine, Shengjing Hospital of China Medical University, Shenyang 110004, China
| | - Li Zheng
- Department of Immunology, College of Basic Medical Sciences, China Medical University, Shenyang 110013, China
| | - Xiao-Song Qin
- Department of Laboratory Medicine, Shengjing Hospital of China Medical University, Shenyang 110004, China
| | - Ya-Ming Cao
- Department of Immunology, College of Basic Medical Sciences, China Medical University, Shenyang 110013, China.
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Khajoueinejad L, Askarifirouzjaei H, Namazi F, Mohammadi A, Pourfathollah AA, Rajaian H, Fazeli M. Immunomodulatory effects of Calcitriol in acute spinal cord injury in rats. Int Immunopharmacol 2019; 74:105726. [PMID: 31276973 DOI: 10.1016/j.intimp.2019.105726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2019] [Revised: 06/09/2019] [Accepted: 06/26/2019] [Indexed: 12/11/2022]
Abstract
Pharmacological therapy options for spinal cord injury (SCI) in acute phase have so far been limited, thus we focused on Calcitriol, FDA-approved biologically active form of vitamin D whose neuroprotective effects are increasingly recognized, to ameliorating damage following acute SCI in rats. Calcitriol (1 μg/kg) treatment for 7 consecutive days after SCI was compared SCI control and Sham control rat groups. Calcitriol-treated group had significantly improved outcome in standard functional recovery evaluation test (BBB) 12 weeks after SCI compared to SCI control, which was confirmed by increased ventral horn motor neurons in Calcitriol-treated group. In addition, proliferation test performed on lymphocytes from spleen and lymph nodes one week after SCI showed that calcitriol injection has a significant regulatory effect on Division Index (DI) in response to MBP stimulation compared to control SCI groups, which was associated with significant reduction in IFN-γ and IL-17A secretion and leukocyte infiltration into injury site. Along with confirmation of immunoregulatory aspects of Calcitriol treatment against myelin antigens in SCI, this study has shown that reducing the extent of progressive tissue loss by Calcitriol therapy in acute phase, could result in better recovery after SCI.
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Affiliation(s)
- Leila Khajoueinejad
- Department of Pharmacology, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
| | - Hadi Askarifirouzjaei
- Department of Immunology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Fatemeh Namazi
- Department of Pathobiology, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
| | - Ali Mohammadi
- Department of Pathobiology, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
| | - Ali Akbar Pourfathollah
- Department of Immunology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Hamid Rajaian
- Department of Pharmacology, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
| | - Mehdi Fazeli
- Department of Pharmacology, School of Veterinary Medicine, Shiraz University, Shiraz, Iran.
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Bivona G, Agnello L, Lo Sasso B, Scazzone C, Butera D, Gambino CM, Iacolino G, Bellia C, Ciaccio M. Vitamin D in malaria: more hypotheses than clues. Heliyon 2019; 5:e01183. [PMID: 30793054 PMCID: PMC6370580 DOI: 10.1016/j.heliyon.2019.e01183] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 01/22/2019] [Accepted: 01/25/2019] [Indexed: 12/15/2022] Open
Abstract
Vitamin D is a secosteroid hormone regulating calcium and phosphate metabolism, immune response and brain development. Low blood 25(OH)D levels have been reported in patients affected by infectious diseases caused by parasites, including malaria. Despite the high effectiveness of antimalarials, malaria is burdened with high morbidity and mortality, and the search for additional therapies is rapidly growing. Furthermore, available preventive measures have proved to be barely effective so far. Finding new prevention and therapy tools is a matter of urgency. Studies on animal models and humans have hypothesized some mechanisms by which the hormone can influence malaria pathogenesis, and the role of Vitamin D supplementation in preventing and treating this disease has been suggested. Few studies on the association between Vitamin D and malaria are available and disagreeing results have been reported. Studies in humans reporting an association between low 25(OH)D circulating levels and Malaria have a small sample size and observational study-set. Randomized controlled trials are needed in order to understand if Vitamin D administration might play a role in preventing and treating malaria.
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Affiliation(s)
- Giulia Bivona
- Section of Clinical Biochemistry and Clinical Molecular Medicine, Department of Biomedicine, Neuroscience and Advanced Diagnostics, University of Palermo, Italy
| | - Luisa Agnello
- Section of Clinical Biochemistry and Clinical Molecular Medicine, Department of Biomedicine, Neuroscience and Advanced Diagnostics, University of Palermo, Italy
| | - Bruna Lo Sasso
- Section of Clinical Biochemistry and Clinical Molecular Medicine, Department of Biomedicine, Neuroscience and Advanced Diagnostics, University of Palermo, Italy
| | - Concetta Scazzone
- Section of Clinical Biochemistry and Clinical Molecular Medicine, Department of Biomedicine, Neuroscience and Advanced Diagnostics, University of Palermo, Italy
| | - Daniela Butera
- Section of Clinical Biochemistry and Clinical Molecular Medicine, Department of Biomedicine, Neuroscience and Advanced Diagnostics, University of Palermo, Italy
| | - Caterina Maria Gambino
- Section of Clinical Biochemistry and Clinical Molecular Medicine, Department of Biomedicine, Neuroscience and Advanced Diagnostics, University of Palermo, Italy
| | - Giorgia Iacolino
- Section of Clinical Biochemistry and Clinical Molecular Medicine, Department of Biomedicine, Neuroscience and Advanced Diagnostics, University of Palermo, Italy
| | - Chiara Bellia
- Section of Clinical Biochemistry and Clinical Molecular Medicine, Department of Biomedicine, Neuroscience and Advanced Diagnostics, University of Palermo, Italy
| | - Marcello Ciaccio
- Section of Clinical Biochemistry and Clinical Molecular Medicine, Department of Biomedicine, Neuroscience and Advanced Diagnostics, University of Palermo, Italy.,Department and U.O.C. Laboratory Medicine, University Hospital "Paolo Giaccone" of Palermo, Italy
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