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CONTEXT: Intravesical Bacillus Calmette-Guérin (BCG) is a cause of bladder and systemic toxicity that is difficult to prevent and is responsible for treatment drop out in bladder cancer patients. More recently, BCG shortage has become the main cause of incomplete treatment. AIMS: The aim of this study was to examine the impact on long-term prognosis of bladder cancer patients following discontinuation of BCG instillations. SETTINGS AND DESIGN: In this retrospective study, data were examined from 333 consecutive nonmuscle invasive bladder cancer patients treated from 2005 to 2015 by transurethral resection (TUR) and had undergone adjuvant BCG therapy after TUR. SUBJECTS AND METHODS: Rate of complete cure, the reason for the interruption, toxicity, and the associations between discontinuance of BCG therapy, tumor characteristics, association with carcinoma in situ and tumor recurrence or progression were analyzed. STATISTICAL ANALYSIS USED: Recurrence and progression-free survival rate curves were estimated using the Kaplan-Meier method and were compared using the log-rank test. Univariate and multivariate analyses were performed using the Cox proportional hazards model. Differences among groups were considered as statistically significant when P < 0.05. RESULTS: Overall, 303 patients were eligible for analysis. Median follow up was 36 (confidence interval: 7-120) months. A total of 55 (18.1%) had <6 installations (Group I); 87 (28.7%) completed induction and 1-year maintenance (Group III); and 161 (53.1%) completed the induction course, but not the 1-year maintenance (Group II). Grade III-IV toxicity rates were significantly higher in Group I than Group II and III. Interruption for BCG shortage was the main cause of interrupting BCG in Group II. Multivariate analysis showed that discontinuation of BCG induction therapy was an independent predictor for tumor recurrence (P < 0.001) and 1-year BCG maintenance therapy for tumor progression (P = 0.005). CONCLUSIONS: Discontinuation of BCG therapy has a significantly deleterious effect on tumor recurrence and progression rates. Although BCG toxicity is a major cause of drop out, BCG shortage became a major cause of discontinuation. All effort must be done today to restore normal production of BCG worldwide.
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PURPOSE: Mandibular reconstruction with fibula free flap harvest is currently the reference technique. Various preoperative processes have been developed to optimize this reconstruction. We report our experience with a simple, inexpensive, preoperative technique requiring a 3D printer, a device for maintaining mandibular reduction, a paper-cutting guide. TECHNICAL NOTE: Stereomodels of the mandible were obtained from computed tomography scan data and printed 3D in ABS. It allowed planning mandibular osteotomies, determine the angle between two bone fragments, and preoperatively modeling the osteosynthesis plate. A paper-cutting guide, and a simple device for maintaining mandibular reduction were also built. Two patients were operated on with this technique, with follow-up at 6 and 8 months. Reconstructions were successful with good clinical outcome in terms of mandibular contour and reconstructed segments positions. DISCUSSION: Preoperative planning of reconstruction may be used for mandibular osteotomies, fibular osteotomies, maintaining mandibular reduction, osteosynthesis, or placing implants for dental rehabilitation. The most complex procedures can virtually plan all these steps, but they are expensive and long to implement. Nevertheless, such procedures are quite expansive and require time not always compatible with carcinoma. Using a mandibular stereomodel is fast, easy, and cheap.
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The syncytiotrophoblast layer plays a major role throughout pregnancy, since it is the site of numerous placental functions, including ion and nutrient exchange and the synthesis of steroid and peptide hormones required for fetal growth and development. Inadequate formation and regeneration of this tissue contributes to several pathologies of pregnancy such as intrauterine growth restriction and preeclampsia, which may lead to iatrogenic preterm delivery in order to prevent fetal death and maternal complications. Syncytiotrophoblast formation can be reproduced in vitro using different models. For the last ten years we have routinely purified villous cytotrophoblastic cells (CT) from normal first, second and third trimester placentas and from gestational age-matched Trisomy 21 placentas. We cultured villous CT on plastic dishes to follow the molecular and biochemical aspects of their morphological and functional differentiation. Taking advantage of this unique collection of samples, we here discuss the concept that trophoblast fusion and functional differentiation may be two differentially regulated processes, which are linked but quite distinct. We highlight the major role of mesenchymal-trophoblast cross talk in regulating trophoblast cell fusion. We suggest that the oxidative status of the trophoblast may regulate glycosylation of proteins, including hCG, and thereby modulate major trophoblast cell functions.
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Síndrome de Down/metabolismo , Síndrome de Down/patología , Placentación , Trofoblastos/citología , Trofoblastos/fisiología , Comunicación Celular , Diferenciación Celular , Fusión Celular , Línea Celular , Células Cultivadas , Gonadotropina Coriónica/genética , Gonadotropina Coriónica/metabolismo , Síndrome de Down/fisiopatología , Femenino , Regulación del Desarrollo de la Expresión Génica , Glicosilación , Humanos , Estrés Oxidativo , Placenta/citología , Placenta/patología , Placenta/fisiología , Placenta/fisiopatología , Embarazo , Proteínas Gestacionales/genética , Proteínas Gestacionales/metabolismo , Procesamiento Proteico-Postraduccional , Receptores de HL/genética , Receptores de HL/metabolismo , Transducción de SeñalAsunto(s)
Endotelio Vascular/metabolismo , Regulación de la Expresión Génica , Neovascularización Fisiológica , Placenta/irrigación sanguínea , Animales , Vellosidades Coriónicas/fisiología , Células Endoteliales/fisiología , Femenino , Humanos , Embarazo , Trofoblastos/fisiología , Factor A de Crecimiento Endotelial Vascular/metabolismoRESUMEN
Angiogenesis is a key process in the pathogenesis of inflammatory arthritis. Angiogenin is one of the most potent inducers of neovascularization in experimental models in vivo. To look for evidence that angiogenin is involved in inflammatory joint disease, we examined plasma and synovial fluid (SF) samples from rheumatology patients and synovial fibroblast cell culture supernatants. Angiogenin levels were determined by radioimmunoassay and ELISA. Plasma angiogenin concentrations ranged from 96 to 478 ng/ml, with no significant difference between patients and normal controls. In SF, angiogenin concentrations were significantly higher in patients with acute or chronic synovitis (rheumatoid arthritis (RA): median, 104 ng/ml; range 13-748, n = 14; crystal-induced arthritis (CIA): median, 149 ng/ml; range, 37-616, n = 14, and other chronic inflammatory arthritis: median, 42 ng/ml; range, 15-205; n = 9) than in the 18 patients with osteoarthritis (OA) (median, 20 ng/ml; range 8-116) (P < 0.0001, anova). Angiogenin levels in SF from RA patients in remission with secondary OA were similar to those achieved in primary OA, and decreased in parallel with the resolution of acute gout. Angiogenin protein was released by cultured synovial fibroblasts from OA and RA patients, and reached 1.18 ng/106 cells/day. These data suggest that angiogenin may mediate local inflammation in arthritis via effects on angiogenesis and leucocyte regulation.
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Artritis/metabolismo , Ribonucleasa Pancreática/análisis , Líquido Sinovial/química , Análisis de Varianza , Artritis/patología , Artritis Infecciosa/metabolismo , Artritis Infecciosa/patología , Artritis Psoriásica/metabolismo , Artritis Psoriásica/patología , Artritis Reumatoide/metabolismo , Artritis Reumatoide/patología , Estudios de Casos y Controles , Células Cultivadas , Medios de Cultivo Condicionados/química , Fibroblastos/metabolismo , Humanos , Leucocitos Mononucleares/química , Leucocitos Mononucleares/metabolismo , Osteoartritis/metabolismo , Osteoartritis/patología , Ribonucleasa Pancreática/sangre , Ribonucleasa Pancreática/genética , Estadísticas no Paramétricas , Líquido Sinovial/citologíaRESUMEN
Angiogenin is one of the most potent inducers of neovascularization in experimental models in vivo. Angiogenin is normally present in plasma but overexpressed in cancer patients. The possible involvement of angiogenin in the development of cancer is suggested by its overexpression in patients with a variety of tumours and the observation that angiogenin antagonists prevent the growth of human tumour xenografts in athymic mice. This 14.1-kDa protein has 35% amino acid sequence identity with human pancreatic ribonuclease and displays ribonucleolytic activity. As only angiogenin is able to induce angiogenesis, its biological activities are thought to result from structural characteristics. Although the structural characteristics of angiogenin have been extensively studied, the understanding of its physiological role and of how its properties are expressed is still to be deciphered. This article reviews some of the biological, biochemical and structural properties of angiogenin.
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Inductores de la Angiogénesis/fisiología , Proteínas de Neoplasias/fisiología , Neoplasias/irrigación sanguínea , Neovascularización Patológica/etiología , Ribonucleasa Pancreática/fisiología , Inductores de la Angiogénesis/química , Animales , Expresión Génica , Humanos , Proteínas de Neoplasias/química , Ribonucleasa Pancreática/químicaRESUMEN
During inflammatory states, airway epithelial cells are stimulated by various proinflammatory mediators to synthesize paracrine mediators including prostaglandin E2, which likely contributes to the recurrence of allergic inflammation. We studied the effects of acetylcholine (ACh) and substance P (SP) on PGE2 release because these two neuromediators are widely involved in airway inflammation, e.g., to trigger mucosal vasodilation and plasma exudation. PGE2 release was studied at baseline and after addition of ACh and SP (10(-10) to 10(-7) M) in primary cultures of human nasal epithelial cells from control mucosa, inflammatory non-atopic mucosa, and inflammatory atopic mucosa. The mediators' effects on COX 2 mRNA were assessed by Northern blotting. We also tested the effect of atropine and SR140333, inhibitors of ACh and SP, respectively. The spontaneous release of PGE2 was about three times higher in cells from atopic subjects. ACh and SP markedly increased PGE2 release (by more than 1.5 times) and this effect was similar whether the sampled tissues were inflammatory or not. In cells from atopic subjects this neuromediator effect led to a fivefold increase in PGE2 release, as compared to baseline production by cells from control mucosa. This stimulation of PGE2 release by neural mediators was inhibited by specific antagonists. ACh and SP increased COX 2 mRNA in the three groups. Thus, neuromediators can bolster PGE2 production in the airway, likely reinforcing inflammation. In conclusion, these data provide evidence that the interplay of nerve fibers and airway epithelial cells is likely important in inflammatory conditions as, e.g., allergy and asthma.
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Acetilcolina/farmacología , Dinoprostona/biosíntesis , Mucosa Nasal/efectos de los fármacos , Sustancia P/farmacología , Vasodilatadores/farmacología , Acetilcolina/antagonistas & inhibidores , Adulto , Anciano , Células Cultivadas , Células Epiteliales/metabolismo , Femenino , Humanos , Hipersensibilidad Inmediata/fisiopatología , Inflamación/fisiopatología , Masculino , Persona de Mediana Edad , Mucosa Nasal/citología , Mucosa Nasal/metabolismo , Sustancia P/antagonistas & inhibidoresRESUMEN
We report a case of Birdshot retinochoroidopathy associated with ocular toxicity due to tamoxifen. Adverse drug effects were suspected due to the presence of yellow-white dots in the paramacular region and the fovea and by modifications of the retinal epithelial pigments. Ocular toxicity should be suspected as it may be reversible if recognized and stopped early. Other adverse ocular effects are described and the pathogenic mechanism of tamoxifen retinopathy analyzed.
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Antineoplásicos Hormonales/efectos adversos , Enfermedades de la Coroides/inducido químicamente , Enfermedades de la Retina/inducido químicamente , Tamoxifeno/efectos adversos , Neoplasias de la Mama/tratamiento farmacológico , Enfermedades de la Coroides/diagnóstico , Femenino , Angiografía con Fluoresceína , Humanos , Persona de Mediana Edad , Enfermedades de la Retina/diagnósticoRESUMEN
Human angiogenin is a 14-kDa plasma protein with angiogenic and ribonucleolytic activities. Angiogenin binds specifically to aortic smooth muscle cells, activates second messenger pathways, and inhibits their proliferation. Human and bovine aortic smooth muscle cells were used to study the internalization and intracellular fate of human angiogenin at 37 degrees C. Using a specific antibody against angiogenin, we found that the internalized native protein was localized in the perinuclear region at 30 min and then dispersed throughout the cytoplasm. In conditions favoring receptor-mediated endocytosis, internalization of iodinated angiogenin showed a first peak at 5 min and then further increased for up to 24 h. The half-life of the molecule, calculated as 12 h in chase experiments, could contribute to its intracellular accumulation. In cell extracts, in addition to the 14-kDa protein, a 8.7-kDa fragment was observed at 24 h, and three fragments with molecular mass of 10.5, 8.7, and 6. 1 kDa were detected at 48 h. Our data point to a specific internalization and processing of human angiogenin by aortic smooth muscle cells.
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Músculo Liso Vascular/metabolismo , Ribonucleasa Pancreática/metabolismo , Inductores de la Angiogénesis/metabolismo , Animales , Aorta/citología , Aorta/metabolismo , Transporte Biológico , Bovinos , Células Cultivadas , Citoplasma/metabolismo , Semivida , Humanos , Cinética , Peso Molecular , Músculo Liso Vascular/citología , Fragmentos de Péptidos/análisis , Proteínas Recombinantes/metabolismoRESUMEN
Angiogenin is a heparin-binding 14 kDa plasma protein with angiogenic and ribonucleolytic activity. Although its structural features have been extensively studied, an understanding of its physiological role and of how its properties are expressed continues to elude researchers. This article discussed some of the biological, biochemical, and structural properties of angiogenin.
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Neovascularización Fisiológica , Proteínas/fisiología , Secuencia de Aminoácidos , Animales , Humanos , Datos de Secuencia Molecular , Ribonucleasa Pancreática/fisiologíaRESUMEN
Human angiogenin is a plasma protein with angiogenic and ribonucleolytic activities. Angiogenin inhibited both DNA replication and proliferation of aortic smooth muscle cells. Binding of 125I-angiogenin to bovine aortic smooth muscle cells at 4 degrees C was specific, saturable, reversible and involved two families of interactions. High-affinity binding sites with an apparent dissociation constant of 0.2 nm bound 1 x 104 molecules per cell grown at a density of 3 x 104.cm-2. Low-affinity binding sites with an apparent dissociation constant of 0.1 micrometer bound 4 x 106 molecules.cell-1. High-affinity binding sites decreased as cell density increased and were not detected at confluence. 125I-angiogenin bound specifically to cells routinely grown in serum-free conditions, indicating that the angiogenin-binding components were cell-derived. Affinity labelling of sparse bovine smooth muscle cells yielded seven major specific complexes of 45, 52, 70, 87, 98, 210 and 250-260 kDa. The same pattern was obtained with human cells. Potential modulators of angiogenesis such as protamine, heparin and the placental ribonuclease inhibitor competed for angiogenin binding to the cells. Together these data suggest that cultured bovine and human aortic smooth muscle cells express specific receptors for human angiogenin.
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Músculo Liso Vascular/metabolismo , Receptores de Superficie Celular/biosíntesis , Ribonucleasa Pancreática , Animales , Aorta/metabolismo , Unión Competitiva , Bovinos , División Celular/efectos de los fármacos , Células Cultivadas , Humanos , Radioisótopos de Yodo , Músculo Liso Vascular/efectos de los fármacos , Proteínas/metabolismo , Proteínas/farmacología , Proteínas RecombinantesRESUMEN
A radio-ribonuclease inhibitor assay based on the interaction of 125I-angiogenin with ribonuclease inhibitor (RI) was used to detect pancreatic-type ribonucleases and potential modulators of their action. We show that highly basic proteins including the homopolypeptides poly-arginine, poly-lysine and poly-ornithine, core histones, spermatid-specific S1 protein and the protamines HP3 and Z3 were strong inhibitors of angiogenin binding to RI. A minimum size of poly-arginine and poly-lysine was required for efficient inhibition. The inhibition likely resulted from direct association of the basic proteins with the acidic inhibitor, as RI bound to poly-lysine and protamines while 125I-angiogenin did not. Antagonists of the angiogenin-RI interaction are potential regulators of either angiogenin-triggered angiogenesis and/or intracellular RI function, depending on their preferential target.
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Aminoácidos/metabolismo , Histonas/metabolismo , Hormonas Placentarias/metabolismo , Protaminas/metabolismo , Proteínas/metabolismo , Ribonucleasa Pancreática , Unión Competitiva , Precipitación Química , Proteínas Cromosómicas no Histona/metabolismo , Proteínas de Unión al ADN/metabolismo , Humanos , Peróxido de Hidrógeno/farmacología , Concentración 50 Inhibidora , Peso Molecular , Péptidos/metabolismo , Polilisina/metabolismo , Unión Proteica , Proteínas/antagonistas & inhibidores , Proteínas de Unión al ARN/metabolismo , Reactivos de Sulfhidrilo/farmacologíaRESUMEN
Angiogenin is a potent inducer of blood-vessel formation with ribonucleolytic activity. Angiogenin binds to high affinity endothelial cell receptors and with lower affinity to extracellular matrix components. Here we report the effect of copper and zinc on these interactions. There was a 4.3-fold increase in angiogenin binding to calf pulmonary artery endothelial cells in the presence of Cu2+ in vitro. A 3.8-fold increase was observed with Zn2+, whereas Ni2+, Co2+, or Li+ had no effect. Specific angiogenin binding to the lower affinity matrix sites was increased by 2.7- and 1.9-fold in the presence of Cu2+ and Zn2+ respectively. Metal ion affinity chromatography and atomic absorption spectrometry were used to show the direct interaction of angiogenin with copper and zinc ions. Angiogenin bound 2.4 mol of copper per mole of protein. We suggest that copper, a modulator of angiogenesis in vivo, may be involved in the regulation of the biological activity of angiogenin.
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Cobre/metabolismo , Endotelio Vascular/metabolismo , Proteínas/metabolismo , Ribonucleasa Pancreática , Inductores de la Angiogénesis/metabolismo , Animales , Cationes Bivalentes , Bovinos , Células Cultivadas , Cromatografía de Afinidad , Cobre/farmacología , Humanos , Arteria Pulmonar , Proteínas Recombinantes/metabolismo , Espectrofotometría Atómica , Zinc/metabolismo , Zinc/farmacologíaRESUMEN
The requirement of serum in cell culture is a major limitation for studies on secreted ribonucleases (RNases) because serum contains a high amount of ribonucleolytic activity. Defined culture condition is thus of interest to improve our knowledge of the RNase biology. We report here that cells from three different types and origins, Chinese hamster lung fibroblasts, bovine smooth muscle cells, and human endothelium-derived EA.hy926 cells, proliferate consistently in the presence of a basal medium supplemented with bovine serum albumin, high-density lipoproteins, basic fibroblast growth factor, insulin, and transferrin. Using a new quantitative radio-RNase inhibitor assay, two distinct ribonucleolytic assays, and a radioimmunoassay against angiogenin, it is shown that RNases became apparent in media conditioned by cell monolayers. Both the hamster lung fibroblast and the EA.hy926 cell lines secreted larger amounts of RNase inhibitor-interacting factors and RNase activity than normal smooth muscle cells. The serum-free medium represents an alternative way to grow these cells and allows investigation of biosynthesis and functions of RNases in culture. It should be useful to identify and quantitate unambiguously specific members of the RNase family secreted by normal versus tumor cells in culture.
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Medio de Cultivo Libre de Suero , Ribonucleasas/metabolismo , Animales , Aorta , Bovinos , División Celular , Línea Celular Transformada , Cricetinae , Cricetulus , Medios de Cultivo Condicionados , Endotelio Vascular/metabolismo , Factor 2 de Crecimiento de Fibroblastos/farmacología , Fibroblastos/metabolismo , Humanos , Insulina/farmacología , Lipoproteínas HDL/farmacología , Músculo Liso Vascular , Albúmina Sérica Bovina , Transferrina/farmacologíaRESUMEN
The internalization of basic fibroblast growth factor (FGF-2) was studied in Chinese hamster lung fibroblasts (CCL39). Recombinant FGF-2 was derivatized with a photoactivable agent, N-hydroxysuccinimidyl-4-azidobenzoate (HSAB), iodinated, and used to visualize intracellular FGF-2-affinity-labeled molecules after internalization at 37 degrees C. Iodinated HSAB-FGF-2 maintained the properties of natural FGF-2 such as affinity for heparin, binding to Bek and Fig receptors, interaction with high- and low-affinity binding sites, and reinitiating of DNA synthesis in CCL39 cells. Affinity-labeling experiments at 4 degrees C with 125I-HSAB-FGF-2 led to the detection of several FGF-cell surface complexes with apparent molecular mass of 80, 100, 125, 150, 170-180, 220, 260, and about 320 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), whereas two specific bands at 80 and 130-160 kDa were obtained using the homobifunctional cross-linking reagent, disuccinimidyl suberate. When the cells, preincubated with 125I-HSAB-FGF-2 at 4 degrees C and then washed, were shifted to 37 degrees C, irradiation of the internalized labeled FGF-2 led to detection of a similar but fainted profile with one major specific band at 80 kDa. Heparitinase II treatment of the cells reduced binding of 125I-HSAB-FGF-2 to its cell surface sites by 80% and internalization by 55%, indicating the involvement of heparan sulfate proteoglycans in these processes. Among the heparitinase-sensitive bands was the 80-kDa complex.
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Factor 2 de Crecimiento de Fibroblastos/metabolismo , Fibroblastos/química , Proteínas Tirosina Quinasas Receptoras/análisis , Receptores de Factores de Crecimiento de Fibroblastos/análisis , Marcadores de Afinidad , Animales , Azidas , Sitios de Unión , Transporte Biológico , Encéfalo , Bovinos , Línea Celular , Membrana Celular , Cricetinae , Cricetulus , Reactivos de Enlaces Cruzados , ADN/biosíntesis , Factor 2 de Crecimiento de Fibroblastos/química , Fibroblastos/metabolismo , Proteoglicanos de Heparán Sulfato , Heparitina Sulfato/metabolismo , Polisacárido Liasas , Proteoglicanos/metabolismo , Proteínas Tirosina Quinasas Receptoras/metabolismo , Receptor Tipo 2 de Factor de Crecimiento de Fibroblastos , Receptores de Factores de Crecimiento de Fibroblastos/metabolismo , SuccinimidasRESUMEN
Angiogenin is a secreted polypeptide that induces neovascularization in vivo. The expression of angiogenin by human cells in culture was investigated by using a specific radioimmunoassay and by cDNA hybridization. Angiogenin immunoreactivity was widely but differentially produced by anchorage-dependent growing cells including vascular endothelial cells from saphenous and umbilical veins, aortic smooth muscle cells, fibroblasts (from embryos, new-borns and adults), and tumour cells. Endothelial cells from saphenous veins and the endothelium-derived EA.hy926 cell line released immunoreactivity whatever the stage of the culture, including release at the lag phase, during exponential growth and at the confluent phase. However, the rate of accumulation of angiogenin varied as a function of EA.hy926 cell density. As compared to anchored cells, normal peripheral blood cells and tumour cells of myelomonocytic and megakaryocytic origin did not noticeably secrete angiogenin except at low levels. A myeloma cell line supernatant contained as much angiogenin cross-reactivity as did anchored cells, while four tumour T-cell lines expressed the cross-reactivity at different levels, i.e. from undetectable levels to a high level. A 0.9-kb angiogenin messenger RNA was detected by Northern-blot analyses in a variety of representative cells correlating with the presence of immunoreactivity in the cell-culture media. The widespread expression pattern of angiogenin suggests a physiological function that is not restricted to the neovascularization process.
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Expresión Génica , Neovascularización Patológica , Proteínas/genética , Ribonucleasa Pancreática , Sangre , Northern Blotting , Proteínas Portadoras/análisis , Recuento de Células , División Celular , Línea Celular , Línea Celular Transformada , Medios de Cultivo , Medios de Cultivo Condicionados , Endotelio Vascular/metabolismo , Humanos , Leucocitos/metabolismo , Megacariocitos/metabolismo , Biosíntesis de Proteínas , Proteínas/metabolismo , ARN Mensajero/análisis , ARN Mensajero/metabolismo , Radioinmunoensayo , Células Tumorales CultivadasRESUMEN
Several growth factors are potential inducers of neovascularization. This property established from in vitro or in vivo studies suggest that these polypeptides might be involved in physiological angiogenesis. Recent advances in the structure of the growth factors, identification of specific cell surface receptors and in their mechanisms of action bring a better understanding of the biochemical events involved in angiogenesis.
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Circulación Colateral/fisiología , Sustancias de Crecimiento/fisiología , Neovascularización Patológica/etiología , Animales , Modelos Animales de Enfermedad , Sustancias de Crecimiento/química , Sustancias de Crecimiento/clasificación , Humanos , Receptores de Factores de Crecimiento/fisiologíaRESUMEN
Human HeLa adenocarcinoma cells did not respond to basic fibroblast growth factor (bFGF or FGF-2) but did bind the same amount of bFGF as responsive Chinese hamster lung fibroblasts (CCL 39). Heparinase II treatment of HeLa and CCL 39 cells resulted in a decrease of bFGF binding by 96 and 57%, respectively, indicating that heparan sulfate molecules were involved in bFGF binding. On HeLa cells, bFGF bound to a single family of low-affinity sites. Cross-linking experiments of 125I-bFGF to HeLa cells yielded several labeled complexes. Cell-associated 125I-bFGF was internalized in both cell types either by high-affinity receptors and heparitinase-sensitive sites in CCL 39 cells or by heparitinase-sensitive binding sites only in HeLa cells. The binding of bFGF to nonresponsive HeLa cells and its internalization via a family of heparitinase-sensitive binding sites might illustrate other functions of bFGF unrelated to cell proliferation.
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Factor 2 de Crecimiento de Fibroblastos/metabolismo , Células HeLa/metabolismo , Animales , Sitios de Unión , Northern Blotting , Bovinos , División Celular , Línea Celular , Cloratos/farmacología , Cricetinae , ADN/biosíntesis , Fibroblastos/citología , Fibroblastos/metabolismo , Células HeLa/citología , Heparitina Sulfato/metabolismo , Humanos , Cinética , Pulmón/citología , Pulmón/metabolismo , Polisacárido Liasas/metabolismo , Proteínas Recombinantes/metabolismoRESUMEN
The authors report an atypical case of actionomycosis implanted in the nasal cavity and occurring twenty years after septum surgery. Treatment by penicillin and surgical excision gave a good result. Cervicofacial actinomycosis is caused by actinomyctes which usually lives as a saprophyte in the oral cavity. A trauma is often found in the previous history. Diagnosis with tumors and abscess may be difficult. The histopathological examination shows typical aspects of the granuloma (gram+ and Grocott+) and the bacteriological isolation of the germ is difficult to obtain. Penicillin associated with surgical excision is the best therapy, but high doses must be used for a long time. The literature is reviewed without finding such a case.
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Actinomicosis Cervicofacial/microbiología , Cavidad Nasal , Enfermedades Otorrinolaringológicas/microbiología , Actinomicosis Cervicofacial/diagnóstico , Actinomicosis Cervicofacial/terapia , Diagnóstico Diferencial , Femenino , Humanos , Persona de Mediana Edad , Cavidad Nasal/microbiología , Tabique Nasal/cirugía , Enfermedades Nasales/diagnóstico , Enfermedades Nasales/microbiología , Enfermedades Nasales/terapia , Enfermedades Otorrinolaringológicas/diagnóstico , Enfermedades Otorrinolaringológicas/terapia , Complicaciones PosoperatoriasRESUMEN
Patients who are cured from head and neck carcinomas remain at high risk for developing a second primary in the head and neck area. It is now clear that retinoids exert a prophylactic action on the development of epithelial cancers when tested on laboratory animals and on human premalignant lesions. They are now used in the chemoprevention of epithelial cancers in randomised trials evaluating their efficacy. We prospectively studied 316 patients who developed squamous cell carcinoma of the head and neck, classified as T1/T2, N0/N1 < or 3 cm, M0 according to the UICC TNM classification. Patients were randomly assigned to receive orally, either etretinate (a loading dose of 50 mg/day for the first month, followed by a dose of 25 mg/day in the following months) or a placebo for 24 months. Adjuvant treatment began no later than 15 days after surgery and/or the initiation of radiotherapy. The 5-year survival rate and disease-free survival rate are similar in the two groups. There are no significant differences regarding either local, regional and distant relapses. After a median follow-up of 41 months (range 0-81), 28 patients in the etretinate group and 29 in the placebo group developed a second cancer with, respectively, 12 and 13 in the head and neck region. Adjuvant treatment was definitively discontinued mainly due to toxicity in 33% of patients in the etretinate group versus 23% in the placebo group (P < 0.05). Etretinate, a second-generation retinoid, does not prevent second primary tumours in patients who have been treated for squamous cell carcinoma of the oral cavity and oropharynx.