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)

Two mouse monoclonal antiferritin antibodies were employed to detect tumors. In the first case a solitary hepatoma was defined, while in the second one, mediastinal metastases of breast cancer were detected. In both cases serum ferritin levels were raised. The availability of monoclonal antiferritin antibodies offers certain advantages over polyclonal antibodies (ease of production, purification and reproducibility). These antiferritin antibodies may be found useful in diagnosis and therapy of certain tumors.
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PMID:Radioimmunodetection of tumors with monoclonal antiplacental ferritin antibody: preliminary results. 253 15

Unlike the proven causal association between oral contraceptive (OC) use and hepatic cell adenoma, the link between OCs and hepatocellular carcinoma remains speculative. The case history of a 53-year-old US woman suggests, however, that hepatic cell adenomas may transform into hepatocellular carcinoma. The patient, who had used Ovral continuously since 1966, presented in 1985 with vague abdominal pain and a palpable right upper quadrant mass. Computed tomography revealed a 12 x 8 cm mass in the right hepatic lobe and 2 small lesions in the left lobe. Serum alpha-fetoprotein and ferritin levels were normal and tests for hepatitis B were negative. A needle biopsy of the right lobe mass indicated benign hepatic adenoma. OC use was discontinued and the patient was examined at bimonthly intervals. Although she continued to report vague pain, there were no significant changes in radiologic findings or levels of alpha-fetoprotein over the next 18 months. At the 18-month follow-up visit, the alpha-fetoprotein level showed an increase to 227 mcg/L and had risen to 2300 mcg/L by the 30-month follow-up visit. At this time, computed tomography showed slight enlargement of the right lobe mass and inhomogeneity, while biopsy revealed sclerosing hepatocellular carcinoma. This is the 3rd case reported in the literature in which there is evidence of a transformation of hepatic cell adenomas into hepatocellular carcinoma in longterm OC users. Thus, the premalignant potential of hepatic cell carcinomas in OC users should be considered by physicians who follow such cases.
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PMID:Transformation of hepatic cell adenoma to hepatocellular carcinoma due to oral contraceptive use. 253 93

Previous studies from this laboratory support the view that increased serum ferritin levels are associated with an increased risk of primary hepatocellular carcinoma (PHC). We have tested this hypothesis in a population of Korean patients with chronic liver disease followed for development of PHC. Serum ferritin levels were measured over time in 249 patients with liver diseases (mostly chronic) followed for 2 to 17 years in Seoul, Korea. Most of the patients were chronically infected with hepatitis B virus. During the first 8 months of follow-up, there were no cases of PHC and no deaths. During this same period, no patient had a serum ferritin level initially below 300 ng/ml and rising above 300 ng/ml, but some patients with ferritin levels above 300 ng/ml experienced decreases to below 300 ng/ml. Therefore, patients were grouped by ferritin level during the first 8 months of follow-up into 3 categories according to the above criteria. Multivariate analysis showed that consistently elevated ferritin levels (category 3) were significantly associated with the development of PHC. Men were more likely to have elevated ferritin levels than women and were at higher risk of developing PHC. Men who were chronically infected with HBV and had ferritin levels above 300 ng/ml had a 50% chance of developing PHC during the follow-up period, compared with a 20% risk of PHC for men with lower ferritin levels (categories 1 and 2). This elevated risk of PHC in men with elevated ferritin levels was confined to the first 3 years of follow-up.
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PMID:Increased serum ferritin in chronic liver disease: a risk factor for primary hepatocellular carcinoma. 253 99

The expression of ferritin genes has been studied in two well differentiated hepatoma cell lines, HepG2 and Hep3B, and in an undifferentiated cell line, HepPLC/PRF/5. The steady-state level of the H and L ferritin subunit mRNAs is different in the three cell lines, being most abundant in the HepG2 and Hep3B cells. The efficiency of promotion of transcription of the H and L gene promoters is not correlated with the levels of the two transcripts; moreover the half-life of the H and L mRNAs varies among the hepatoma cells. The different level of ferritin mRNAs in differentiated and undifferentiated cells appears to be mainly due to a different stability of the transcripts.
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PMID:Expression of genes of ferritin subunits in human hepatoma cell lines. 254 79

In order to determine if iron was able to stimulate specifically ferritin synthesis and secretion in transformed human hepatocytes in culture, human hepatoma cell (HepG2) cultures were submitted to increasing doses of ferric nitrilotriacetate. Iron uptake by the cells was demonstrated by incorporation of 59 Fe and the staining method of Perls. The following results were obtained: 1. iron incorporation within the hepatocytes increased as a function of culture time; 2. during the first 24 h of treatment, ferritin synthesis increased progressively, in parallel to the iron uptake; 3. a dose-dependent significant stimulation of ferritin synthesis and secretion were observed when the medium iron concentration increased from 5 to 20 mumol/l; 4. albumin, transthyretin and transferrin secretions were unaffected. These data demonstrated that, in our hepatocyte culture model, iron load increased the expression of ferritin in a highly specific manner.
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PMID:Iron induction of ferritin synthesis and secretion in human hepatoma cell (Hep G2) cultures. 254 99

Thin-layer IEF, an analytical technique of high resolution for protein, was used to identify the liver isoferritin in Wistar rat, normal human and patients with hepatocellular carcinoma (HCC) respectively. The focusing conditions were 2000 V, 25W, 10 degrees C, 2h. The results showed that the IEF bands of the liver isoferritin in Wistar rat, normal human and patients with HCC were 7, 6, 3 and the pI of the liver isoferritin were 5.76-4.75, 5.80-4.85, 4.50-4.43 respectively. The method and data in this paper might be good reference for in-depth study of the structure and function of ferritin and its applications in clinical medicine.
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PMID:[Study on identification of liver isoferritin by isoelectrofocusing in thin-layer polyacrylamide gels]. 256 Apr 59

A new human hepatocellular carcinoma (HCC) cell line, KYN-2, has been established from a surgical specimen obtained from a 52-year-old Japanese male HCC patient. The originally resected HCC was classified as pleomorphic HCC corresponding to Edmondson-Steiner's grade III with a thick trabecular to solid arrangement. The cell line has been maintained for 17 months through 35 passages. Morphologically, the KYN-2 cells have retained the characteristics of the original HCC, being pleomorphic and composed of various types such as cells with relatively small, polygonal, eosinophilic cytoplasm and oval-shaped nuclei with a marked tendency to pile up, flat cells with abundant clear cytoplasm and oval-shaped nuclei, and many multinucleated giant cells, proliferating in a pavement-like cell arrangement. Some junctional complexes and a number of microvilli are evident between the cells by electron microscopy. Functionally, these cells were found to secrete albumin, alpha 1-acid glycoprotein, alpha 1-antitrypsin, ceruloplasmin, transferrin, complement C, fibrinogen, fibronectin, prothrombin, retinol-binding protein (serum type), alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA), ferritin and beta 2-microglobulin in chemically defined medium (CDM). The secretion of AFP and CEA is apparently dependent upon culture medium and passage. The doubling time of cells growing in serum-containing medium at the 14th passage was 84 h, and those of cells in serum-containing medium, HB101 (serum-free medium) and CDM at late passage were 28, 68, and 42 h, respectively. Chromosome analysis revealed that the chromosome number ranged from 56 to 69 without a mode, and the presence of marker chromosomes. HB virus DNA sequence was not detected by hybridization analysis. The tumorigenicity of KYN-2 cells was identified by development of tumors in nude mice after subcutaneous injection of the cells; the tumors showed an appearance basically similar to that of the original HCC. Thus, these findings suggest that the KYN-2 cell line is available as a new human HCC cell line and should be useful for various studies on HCC.
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PMID:A new human pleomorphic hepatocellular carcinoma cell line, KYN-2. 284 82

The intracellular distributions of the cation-independent mannose 6-phosphate receptor (MPR) and a 120-kD lysosomal membrane glycoprotein (lgp120) were studied in rat hepatoma cells. Using quantitative immunogold cytochemistry we found 10% of the cell's MPR located at the cell surface. In contrast, lgp120 was not detectable at the plasma membrane. Intracellularly, MPR mainly occurred in the trans-Golgi reticulum (TGR) and endosomes. lgp120, on the other hand, was confined to endosomes and lysosomes. MPR was present in both endosomal tubules and vacuoles, whereas lgp120 was confined to the endosomal vacuoles. In cells incubated for 5-60 min with the endocytic tracer cationized ferritin, four categories of endocytic vacuoles could be discerned, i.e., vacuoles designated MPR+/lgp120-, MPR+/lgp120+, MPR-/lgp120+, and vacuoles nonimmunolabeled for MPR and lgp120. Tracer first reached MPR+/lgp120-, then MPR+/lgp120+, and finally MPR-/lgp120+ vacuoles, which are assumed to represent lysosomes. To study the kinetics of appearance of endocytic tracers in MPR-and/or lgp120-containing pools in greater detail, cells were allowed to endocytose horse-radish peroxidase (HRP) for 5-90 min. The reduction in detectability of MPR and lgp120 antigenicity on Western blots, due to treatment of cell homogenates with 3'3-diaminobenzidine, was followed in time. We found that HRP reached the entire accessible pool of MPR almost immediately after internalization of the tracer, while prolonged periods of time were required for HRP to maximally access lgp120. The combined data suggest that MPR+/lgp120+ vacuoles are endocytic vacuoles, intermediate between MPR+/lgp120-endosomes and MPR-/lgp120+ lysosomes, and represent the site where MPR is sorted from lgp120 destined for lysosomes. We propose that MPR is sorted from lgp120 by selective lateral distribution of the receptor into the tubules of this compartment, resulting in the retention of lgp120 in the vacuoles and the net transport of lgp120 to lysosomes.
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PMID:Sorting of mannose 6-phosphate receptors and lysosomal membrane proteins in endocytic vesicles. 284 7

Normal liver ferritin is composed of basic isoferritins with a greater proportion of liver (L) type. Hepatocellular carcinoma (HCC) contains, in addition, acidic isoferritin with H heart myocardium (H) type similar to that in normal adult heart myocardium, early gestation fetal liver, early placenta, HeLa cells, and tumors. Using antisera to liver and myocardial ferritin, immunohistochemical basic and acidic isoferritins, respectively, were studied in 36 HCCs. There was no significant difference in the frequencies of liver ferritin in 17 (47%) tumors and of myocardial ferritin in 22 (61%) (P = 0.3). Ten (28%) tumors showed neither basic nor acidic isoferritin, and nine (25%) had acidic but not basic isoferritin. Raised serum ferritin levels in HCC patients probably, in part, reflect ferritin secretion by the tumor. The actual serum level would then consist of a mixture of basic and acidic (possibly tumor-specific) isoferritins. Thus, diagnostic use of a serum assay which utilizes antiserum to liver ferritin will demonstrate only basic isoferritins and probably will not detect raised serum levels in approximately half of HCC patients.
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PMID:Immunohistochemical basic and acidic isoferritins in hepatocellular carcinoma. 285 86

Higher serum iron and ferritin levels noted in hepatitis B antigen (HBAg) carriers than in noncarriers suggests that virus might actively replicate in hepatocytes, stimulate ferritin synthesis, and result in increased liver iron stores. A comparative semiquantitative study of immunohistochemical ferritin (0-12) and hemosiderin (0-9) was performed on 54 normal, 13 cirrhotic, and 70 nonneoplastic livers from patients with hepatocellular carcinoma, in each group, comparing amounts in HBAg-positive and HBAg-negative patients. Mean scores for ferritin and hemosiderin were high in all three groups, normal livers averaging 8.3 and 6, respectively, cirrhotic livers, 8.5 and 7.4, respectively, and carcinoma livers, 5.6 and 6.1, respectively. In each group, there was no significant difference in ferritin and hemosiderin mean scores in HBAg-positive and HBAg-negative patients. The large liver iron stores do not appear to be a consequence of hepatitis B virus infection alone. Their role in the development of hepatocellular carcinoma is still to be elucidated.
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PMID:Liver iron stores and hepatitis B antigen status. 299 50


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