Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0024530 (malaria)
 44,886 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Serum vitamin B12 and vitamin B12 binding proteins (transcobalamins, TCS) were determined in patients with malaria, amoebic liver abscess, carcinoma of the liver, infectious hepatitis, cirrhosis and chronic myelocytic leukemia (CML) as well as in 60 blood donor subjects. Serum vitamin B12 in patients with infectious hepatitis, cirrhosis and CML were higher than that of the normal subjects. The values of unsaturated vitamin B12 binding capacity (UBBC) in patients with carcinoma of the liver, infectious hepatitis, cirrhosis were lower while that of patients with CML were higher than that of the normal subjects. A markedly increased TCI and decreased TCII was observed in patients with CML while these changes was much less in patients with other liver diseases. The difference was possibly due to a flooding of vitamin B12 from damaged liver cells into the circulation and the decreased synthesis of transcobalamins in patients with liver diseases while the increased granulocytes, the source of TCI, was much increased in patients with CML.
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PMID:Vitamin B12 and vitamin B12 binding proteins in liver diseases. 60 23

This paper presents changes in the bone marrow of patients with malaria; it is based primarily on observations of bone marrows of 89 Gambian children with P. falciparum malaria and includes a review of the literature. Erythroid hyperplasia with dyserythropoiesis was found to be more common in patients with severe anemia and low grade parasitemia than in those with acute malaria. The dyserythropoietic changes are illustrated both with light photomicropraphs and with electron micrographs. The significance of the dyserythropoiesis and possible causes are discussed. Other changes in these patients with acute malaria include lymphocytosis in the bone marrow and reactive lymphocytes, monocytosis and mild neutrophilia in the peripheral blood. Giant metamyelocytes were also commonly seen in bone marrow of patients but were thought to be part of dysmyelopoiesis and not due to B12 or folate deficiency. Phagocytosis of erythrocytes, parasitized cells and nucleated cells was more commonly seen in macrophages in acute malaria, while phagocytosis of small particles such as merozoites was observed in neutrophils. Megakaryocytes were found to be increased in number in patients with acute malaria; a proportion of these cells had rounded nuclei, probably indicating accelerated platelet turnover.
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PMID:Hematopoiesis in human malaria. 225 20

Nine Thai adults with P. vivax malaria were investigated. Light and electron microscope studies of marrow aspirates revealed morphological evidence of dyserythropoiesis in six of them. Dyserythropoiesis was most marked in the four most anaemic patients. In these four patients the electron microscope also revealed the presence of erythroblasts at various stages of degradation within the cytoplasm of macrophages. Neither the dyserythropoiesis nor the ineffective erythropoiesis could be attributed to a deficiency of vitamin B12, folate or iron. The abnormalities of erythropoiesis seemed to result from the P. vivax infection itself. Other bone marrow reactions seen in this infection included macrophage hyperplasia, plasmacytosis and increased eosinophil granulocytopoiesis. Unlike in severe P. falciparum malaria, the microvasculature of the marrow was not obstructed by parasitized red cells.
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PMID:Dyserythropoiesis and ineffective erythropoiesis in Plasmodium vivax malaria. 266 Sep 3

To establish the prevalence of anaemia in pregnant women in Mozambique and to determine the locally most important causes of the disease, 881 pregnant women were examined at nine sites in seven of Mozambique's 10 provinces. In Maputo, the capital city, an additional 91 anaemic gravidae were compared to 207 parturients chosen at random. The study comprised interviews, and clinical and laboratory investigations. Between 5 and 15% of the pregnant women at the different sites had haemoglobin (Hb) values below 90 g/l and 58% had levels below 110 g/l. Inspection of mucosal membranes detected almost all the anaemic women with Hb values below 80 g/l. Nulliparous women were more prone to be anaemic. Iron deficiency and malaria were the main causes of anaemia, with malnutrition also contributing. Occasional cases of folic acid deficiency were found among severely anaemic women but no cases of significant deficiency of vitamin B12 were encountered. Sickle cell disease was not found to contribute significantly to anaemia of pregnancy in Mozambique. The mean corpuscular haemoglobin concentration (MCHC) proved more sensitive, under these conditions, than serum ferritin in detecting iron deficiency in anaemic women. Packed cell volume (PCV) analysis may substitute Hb analysis when screening for pregnancy anaemia in Mozambique.
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PMID:Anaemia of pregnancy in Mozambique. 378 85

Haematological indices, malarial parasitaemia, serum and red cell folate (SFA, RCF), serum vitamin B12 and haemoglobin (Hb) electrophoretic patterns were studied in 228 non-elite young Hausa primigravidae at less than 24 weeks of gestation. The study was conducted in the guinea savanna of Nigeria, where malaria is hyperendemic. Ninety-nine (43%) were anaemic (Hb less than 11.0 g dl-1). The commonest cause of anaemia was malaria, in 28% of all and 40% of anaemic subjects. Plasmodium falciparum was predominant; P. malariae was seen in 1.3% and P. ovale was not recorded. Parasitaemia was more frequent and more dense in the wet than the dry season. Iron deficiency was diagnosed in 18% of all and 25% of anaemic women; 14% of all patients were folate-deficient; high MCV and MCH correlated with anaemia, and low SFA was associated weakly with anaemia and malaria. Serum vitamin B12 was normal or high in all 145 in whom it was measured; 3% had congenital elliptocytosis, but this did not contribute to the anaemia. Sickle-cell trait was present in 26% and Hb-AC in less than 1%. Hb-AS was associated with significantly lower frequency and density of P. falciparum; this has not been demonstrated in pregnancy in Africa previously. However, the parasitological advantage was not reflected in any haematological advantage. The roles of malaria, folate-deficiency and iron-deficiency in the causation of anaemia in Hausa primigravidae will be defined further by a double-blind trial of antimalarial prophylactics, iron supplements and folic acid supplements.
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PMID:Anaemia in young primigravidae in the guinea savanna of Nigeria: sickle-cell trait gives partial protection against malaria. 638 38

In summary, it appears that giardiasis, coccidiosis, cryptosporidiosis, strongyloidiasis, capillariasis and perhaps P. falciparum malaria are the only parasitic diseases which cause malabsorption of many nutrients. D. latum and A. lumbricoides interfere with vitamin B12 and vitamin A absorption, respectively. In view of the increasing use of immunosuppressive therapy, it is likely that malabsorption caused by intestinal parasites may become even more evident in the future.
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PMID:Parasites and malabsorption. 640 70

The effects of low concentrations of pyrimethamine on the enzyme dihydrofolate reductase in human bone marrow cells were investigated in vitro using the deoxyuridine suppression test. The results indicated that drug concentrations which are achieved in the plasma of adults receiving 25 mg pyrimethamine per week inhibited the activity of this enzyme in a proportion of the marrow samples studied. Experiments using vitamin B12- or folate-deficient marrow cells showed that these concentrations of pyrimethamine may aggravate a pre-existing impairment of the methylation of deoxyuridylate. These in-vitro findings emphasize the importance of further studies into the toxicity of pyrimethamine when this drug is used for malaria prophylaxis in malnourished individuals.
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PMID:Effects of low concentrations of pyrimethamine on human bone marrow cells in vitro: possible implications for malaria prophylaxis. 732 Oct 70

Man evolved as a hunter-gatherer, and the invention and spread of agriculture was followed by changes in diet, the environment and population densities which have resulted in globally high prevalences of anaemias due to nutritional deficiencies of iron, folate and (locally) vitamin B12, to infestations by hookworm and schistosomes, to malaria, and to the natural selection for the genes for sickle-cell diseases, beta-thalassaemias, alpha-thalassaemias, glucose-6-phosphate dehydrogenase deficiency, ovalocytosis and possibly (locally) elliptocytosis. The present explosion of population is driving an expansion of agriculture, especially the cultivation of rice, and this has led often to disastrous increases of transmission of malaria, schistosomiasis and other diseases, to widespread chemical pollution, and to degradation of the environment. Anaemia, as the commonest manifestation of human disease, is a frequent consequence. The urgent need for increased food production is matched by the urgent need for assessment and control of the health impact of agricultural development.
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PMID:Agriculture-related anaemias. 775 42

Transcobalamin II (TCII) levels have been reported to be elevated in patients with many clinical conditions including proliferative reticuloendothelial system. As reactive macrophage hyperplasia frequently occurs in patients with malaria, the objective of the present study was to determine TCII in patients with Plasmodium falciparum with cerebral symptoms. The studies were performed on 14 cerebral malaria patients as well as 60 normal subjects. The mean values of serum vitamin B12 and TCII levels were significantly higher in the patient group and 6 and 7 patients had serum vitamin B12 and TCII levels higher than the normal values. There was direct relationship between serum TCII levels and BUN or creatinine levels. These findings indicated that raised serum TCII level occurred only in patients with renal insufficiency. A decreased glomerular fiLtration rate reduced the amount of vitamin B12 and TCII-B12 that filtered through the glomeruli resulting in the reduced proximal tubular cells uptake and its degradation of TCII. This reduced lysosomal enzyme activity, therefore, prolongs the intravascular TCII survival and increased secretion of TCII into the circulation. Therefore, serum TCII levels were elevated in these cerebral malaria patients.
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PMID:Abnormally elevated serum transcobalamin II levels in patients with cerebral malaria. 775 77

Serum transcobalamin II (TCII) levels were determined in 56 patients with P. falciparum malaria infection. They were divided into 3 groups: severe (malarial parasite > 5% or patients with cerebral malaria or renal insufficiency), moderate (1-5% infection without complications) and mild (1% infection). Elevated serum TCII values were found only in patients with severe malaria infection. These values correlated directly with parasitemia, blood urea nitrogen and creatinine, but were not correlated with alkaline phosphatase. As 17 patients with azotemia had elevated serum TCII levels while other 3 patients with normal BUN and creatinine concentrations had serum TCII levels within the normal limits. These findings indicated that malarial patients with renal insufficiency had increased serum TCII. A possible mechanism is the reduced TCII-B12 that filtered through the glomeruli due to the reduced renal blood flow with the decreased its uptake by proximal tubular cells resulting in the decreased degradation of TCII by the tubular lysosomal enzymes. Determination of serum TCII level may be used as an indicator of renal function in malarial patients with renal insufficiency.
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PMID:Serum transcobalamin II levels in patients with malaria infection. 852 19


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