Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P02794 (ferritin)
 17,525 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Iron is transported in the blood plasma, mainly bound to transferrin, but in abnormal conditions other iron containing compounds may become important. These include ferritin, haemopexin-haem, haptoglobin-haemoglobin and non-specific non-transferrin-bound iron, all of which are taken up from the circulation by the liver. Transferrin-bound iron can be used by all types of cells in amounts that depend on their complement of transferrin receptors. Immature erythroid cells are the most active in this function. Investigations using reticulocytes as an example of erythroid cells have demonstrated the presence of two mechanisms for the uptake of ferrous iron. One, a high affinity process disappears as reticulocytes mature. It probably represents the mechanism by which iron derived from transferrin is transported into the cytosol after receptor-mediated endocytosis of the iron-transferrin complex. The other mechanism has a lower affinity for iron, is retained when reticulocytes mature and is probably associated with Na+ transport across the cell membrane. The physiological characteristics of the two iron transport processes and the evidence for the above conclusions are summarized in the present paper.
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PMID:Cellular iron processing. 898 22

Bovine lactoferrin binds to a 60 kDa heat shock protein of Helicobacter pylori. Binding ability was related to human immunoglobulin G because bovine lactoferrin binding proteins were isolated by extraction of cell surface associated proteins with distilled water, applied on IgG-Sepharose and nickel sulphate chelate affinity chromatography. Binding was demonstrated by Western blot after purified protein was digested with alpha-chymotrypsin and incubated with peroxidase-labeled bovine lactoferrin. Binding was inhibited by bovine lactoferrin, lactose, rhamnose, galactose, and two iron-containing proteins, ferritin and haptoglobin. Helicobacter pylori binds ferritin and haptoglobin via charge or hydrophobic interactions because this binding was not inhibited by specific and various glycoproteins or carbohydrates. Carbohydrate moieties of bovine lactoferrin molecules seem to be involved in binding because glycoproteins with similar carbohydrate structures strongly inhibited binding. Scatchard plot analysis of the binding of peroxidase-labeled bovine lactoferrin to H. pylori cells yielded a kd 2.88 x 10(-6) M. In addition, binding of H. pylori cells to bovine lactoferrin was enhanced when bacteria treated with pepsin or alpha-chymotrypsin after isolation from iron-restricted and iron-containing media.
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PMID:Cryptic domains of a 60 kDa heat shock protein of Helicobacter pylori bound to bovine lactoferrin. 911 43

The purpose of the study was to examine ferritin, haptoglobin, and red cell indices during a competitive running and swimming season. Male runners (N = 8) and swimmers (N = 5) were tested four times during their respective seasons. The runners were tested before the start of organized practice (RT1), after 3 wk of increased training (RT2), 3 wk prior to the conference championship (pre-taper, RT3), and 3 d after the conference championship (post-taper, RT4). The swimmers were tested after the first 9 wk of training (ST1), after completing 2 wk of hard training (ST2), after an additional 6wk of training (pre-taper, ST3), and 1 wk following the conference championship (post-taper, ST4). For the runners, hemoglobin, hematocrit, and red blood cell number were lower (p < 0.05) at RT2 and were not accompanied by significant changes in other red cell indices or haptoglobin. Serum ferritin in the runners was lower at RT3 and RT4 compared to RT1 despite an adequate dietary iron intake. Hemoglobin and mean cell hemoglobin concentration were lower and mean cell volume was higher in the swimmers at ST3 and ST4. No significant changes were observed in other red cell indices for swimmers; however, serum haptoglobin tended (p = 0.07) to be reduced at ST2. In conclusion, collegiate male runners and swimmers do not demonstrate clinical hypoferritinemia, hypohaptoglobinemia, or alterations in red cell indices suggestive of the early stage of anemia with or without iron deficiency during their respective season.
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PMID:Serum haptoglobin and ferritin during a competitive running and swimming season. 923 36

In order to improve the non aggressive diagnosis of hepatic metastasis from digestive neoplasm, the authors analyzed the following biological parameters: aminotransferases, alkaline phosphatase and lacticodehydrogenase isoenzymes, gammaglutamyl-transpeptidase, conjugated and total bilirubin, C-reactive protein, type A, G, M immunoglobulins, C3 complement factor, alpha-1 acidic glycoprotein (orosomucoid), haptoglobin, ceruloplasmin, transferrin, albumin, prealbumin, ferritin. This work included 54 patients with digestive tract cancer (esophageal, gastric, colic, rectal, anal localizations), divided in two groups: M- (n = 27), without hepatic metastasis), and M+ (n = 27, with histological confirmed hepatic metastasis). The Mann-Whitney test showed significant differences for 12 parameters between the 2 groups. With more than 60% sensitivity (Se) and specificity (Sp), according to the ROC curves, the following parameters can be selected: Total alkaline phosphatase (Se 89%, Sp 70%) and their macromolecular H2 fraction, lacticodehydrogenase fraction 4 (Se 63%, Sp 63%), gammaglutamyl-transpeptidase (Se 85%, Sp 82%), ceruloplasmin (Se 64%, Sp 65%), aspartate-aminotransferase determination (Se 63%, Sp 65%).
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PMID:[Detection of liver metastases from digestive cancer. Value of alkaline phosphatases, their macromolecular isoenzyme and of ceruloplasmin]. 923 22

Searching to define diagnostic criteria for malignant and non-malignant pleural effusions, the differential diagnostic value of ferritin (FRT), haptoglobin (Hp), alpha 1-antitrypsin (alpha 1-AT), lactate dehydrogenase (LDH) and complement factors C3 and C4 were investigated prospectively in 100 consecutive patients with pleural effusions of various aetiologies. Pleural effusion FRT, C3 and C4 concentrations were found to be useful in differentiating exudates from transudates, so that transudates practically could be excluded in pleural effusion: serum FRT ratio lower than 0.5 and/or in pleural effusion values for C3 and C4 higher than 300 mg dl-1 and 70 mg dl-1, respectively. A pleural effusion: serum C3 ratio greater than 2 is seen only in malignant effusions. No discriminative pleural: serum ratio could be found in FRT and C4 values capable of differentiating malignant from non-malignant effusions. Pleural effusion alpha 1-AT and LDH values were elevated in exudates, as compared with transudates, and had an excellent sensitivity and predictive value, but low specificity, in differentiating malignant from non-malignant effusions. Finally, the sensitivity, specificity and positive predictive value of pleural effusion Hp concentrations were lower than those of FRT and complement factors C3 and C4, respectively.
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PMID:Diagnostic value of ferritin, haptoglobin, alpha 1-antitrypsin, lactate dehydrogenase and complement factors C3 and C4 in pleural effusion differentiation. 941 51

To investigate reports on war-related morbidity, 527 active-duty Gulf War veterans and 970 nondeployed veterans from 14 Seabee commands were studied in 1994 with a questionnaire, sera collection, handgrip strength, and pulmonary function testing. The questionnaire assessed postwar symptoms, war exposures, and screened for chronic fatigue syndrome, post-traumatic stress disorder, and psychological symptoms suggesting neurosis (Hopkins Symptom Checklist). Sera were tested with four nonspecific reactant assays: C-reactive protein, transferrin, ferritin, and haptoglobin. Gulf War veterans reported a higher prevalence for 35 of 41 symptoms, scored higher on psychological symptom scales, were more likely to screen for post-traumatic stress disorder, had lower handgrip strength, and had higher serum ferritin assay results. Numerous comparisons of these morbidity outcomes with 30 self-reported exposures demonstrated many associations, but no unique exposure or group of exposures were implicated. Morbidity data are consistent with other postwar observations, but the etiology for morbidity findings remains uncertain.
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PMID:Increased postwar symptoms and psychological morbidity among U.S. Navy Gulf War veterans. 1034 49

Interleukin 11 (IL-11) is a pleiotropic cytokine with biological activities on many different cell types. Recombinant human IL-11 (rhIL-11) is produced by recombinant DNA technology in Escherichia coli. Both in vitro and in vivo, rhIL-11 has shown effects on multiple hematopoietic cell types. Its predominant in vivo hematopoietic activity is the stimulation of peripheral platelet counts in both normal and myelosuppressed animals. This activity is mediated through effects on both early and late progenitor cells to stimulate megakaryocyte differentiation and maturation. rhIL-11 has been approved for the treatment of chemotherapy-induced thrombocytopenia. The hematopoietic effects of rhIL-11 are most likely direct effects on progenitor cells and megakaryocytes in combination with other cytokines or growth factors. rhIL-11 also induces secretion of acute phase proteins (ferritin, haptoglobin, C-reactive protein, and fibrinogen) from the liver. The induction of heme oxidase and inhibition of several P450 oxidases have been reported from in vitro studies. In vivo, rhIL-11 treatment decreases sodium excretion by the kidney by an unknown mechanism and induces hemodilution. rhIL-11 also exhibits anti-inflammatory effects in a variety of animal models of acute and chronic inflammation, including inflammatory bowel disease, inflammatory skin disease, autoimmune joint disease, and various infection-endotoxemia syndromes. rhIL-11 has trophic effects on non-transformed intestinal epithelium under conditions of mucosal damage. The mechanism of the anti-inflammatory activity of rhIL-11 has been extensively studied. rhIL-11 directly affects macrophage and T cell effector function. rhIL-11 inhibits tumor necrosis factor-alpha (TNF alpha), interleukin 1beta (IL-1beta), interleukin 12 (IL-12), interleukin 6 (IL-6), and nitric oxide (NO) production from activated macrophages in vitro. The inhibition of cytokine production was associated with inhibition of nuclear translocation of the transcription factor, nuclear factor kappa B (NF-kappaB). The block to NF-kappaB nuclear translocation correlates with the ability of rhIL-11 to maintain or enhance production of the inhibitors of NF-kappaB, IkappaB-alpha and IkappaB-beta. In addition to effects on macrophages, rhIL-11 also reduces CD4+ T cell production of Th1 cytokines, such as IFN gamma induced by IL-12, while enhancing Th2 cytokine production. rhIL-11 also blocks IFN gamma production in vivo. The molecular effects of rhIL-11 have also been studied in a clinical trial. Molecular analysis of skin biopsies of patients with psoriasis before and during rhIL-11 treatment demonstrates a decrease in mRNA levels of TNF alpha, IFN gamma and iNOS. These activities suggest that in addition to its thrombopoietic clinical use, rhIL-11 may also be valuable in the treatment of inflammatory diseases. The clinical utility of the anti-inflammatory properties of rhIL-11 is being investigated in patients with Crohn's disease, psoriasis and rheumatoid arthritis. These diseases are believed to be initiated and maintained by activated CD4+ Th1 cells in conjunction with activated macrophages.
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PMID:Hematopoietic, immunomodulatory and epithelial effects of interleukin-11. 1048 79

Our objectives were to study the value of different proteins in the serum and ascitic fluid and assess their potential in discriminating between malignant and nonmalignant ascites in a model that could be developed to aid clinical diagnosis. In all, 57 different measurements (30 in serum and 27 in ascitic fluid) including erythrocyte sedimentation rate, number of white blood cells, cytokines, interleukin-1a (IL-1a), IL-1b, IL-2, IL-6, IL-8, tumor necrosis factor-alpha, immunoglobulins (IgG, IgA, IgM), complement factors C3 and C4, acute-phase proteins such as alpha1-acid glycoprotein, alpha2-macroglobulin, alpha1-antitrypsin, haptoglobin, C-reactive protein, ferritin, ceruloplasmin and transferin, were performed in 61 patients with ascites (25 with malignant exudates, 13 with nonmalignant exudates, and 23 with transudates). Patients with sepsis were excluded. Correlation tests and one-way ANOVAs were used for comparisons between different groups. Discriminant analyses were used to assess the significance of each parameter in the differentiation process. Correct classification of 100% of cases required the use of all 57 ascitic fluid measurements in the model, which was not considered practical in clinical diagnosis. Discriminant analysis showed that five ascitic fluid measurements-total protein, LDH, TNF-alpha, C4, and haptoglobin-were sufficient for a model to correctly classify 89% of cases. Cross-validation showed that 70% of unknown cases were correctly classified using this model. In conclusion, we have shown that five easily taken protein measurements in the ascitic fluid can differentiate to a large extent between cases with ascites and have proposed a relatively simple statistical model with these parameters that could be developed to be extremely useful in the clinical setting.
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PMID:Discrimination between malignant and nonmalignant ascites using serum and ascitic fluid proteins in a multivariate analysis model. 1074 24

The aim of the study was to assess the effect of physical exercise on the changes in concentrations of ferritin and soluble transferrin receptor (sTfR) in plasma in course of 10 consecutive days of a training camp. Ten female elite judoists, aged 17-23 years, participated in the study. Mean concentration of ferritin for the 10 day period was 62.8 x 1.633(+/-1) microg/l, the within-subject, day-to-day variability being very high (13-75%). Ferritin concentrations were significantly correlated with the training load on the preceding day (r = 0.397; p < 0.001). Mean level of sTfR was 2.56 x 1.291(+/-1) mg/l and its within-subject variability was much lower (4-16%). Although the training loads had an effect on the intravascular hemolysis as indicated by a significant, negative correlation between load scores and haptoglobin concentration (r = -0.282; p < 0.01), the latter was not correlated significantly with sTfR levels. It was concluded that the soluble transferrin receptor is a more stable indicator of iron status under high training loads since, unlike ferritin, it does not respond to the workload on the preceding day. Moreover, the intravascular hemolysis observed in athletes does not affect the sTfR levels in plasma.
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PMID:The effects of physical exercise on the concentrations of ferritin and transferrin receptor in plasma of female judoists. 1083 48

The transferrin receptor-ferritin index (sTfR/logFerr) was determined in 131 male and 121 female athletes in order to assess the frequency of iron deficiency (threshold value of that index taken as 1.8). Blood was drawn for determining morphological indices as well as sTfR, ferritin, iron, total iron binding capacity (TIBC), and haptoglobin. A significantly (p <.01) higher incidence of iron deficiency was observed in women (26%) than in men (11%). The iron deficiency was latent, since no subject was found to be anemic. The plasma iron was significantly lower and TIBC higher (p <.001) in both iron-deficient subgroups than in the non-deficient ones. This confirmed the latent character of iron deficiency. Some hematological indices (Hb, MCH, MCHC, MCV) were significantly lower in iron-deficient female athletes than in male athletes, which suggested a more profound iron deficiency in the former. The sTfR/logFerr index might thus be useful in detecting iron deficiency in athletes, especially in those with erythropoiesis disorders, since physical loads may affect the widely used ferritin levels.
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PMID:The assessment of frequency of iron deficiency in athletes from the transferrin receptor-ferritin index. 1125 35


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