Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 24
Filtrar
Más filtros

Banco de datos
País/Región como asunto
Tipo del documento
Intervalo de año de publicación
1.
Horm Metab Res ; 48(12): 814-821, 2016 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-27813051

RESUMEN

Salivary cortisol has been used to monitor hydrocortisone replacement in patients with Addison's disease (AD). Since salivary cortisol is metabolised to salivary cortisone, it may be an adjunctive analyte to assess adequacy of hydrocortisone replacement in patients with AD. We aimed to characterise the exposure of salivary cortisol and cortisone in patients and healthy controls. We measured salivary cortisol and cortisone by liquid chromatography-tandem mass spectrometry and constructed a day curve (08:00 until 24:00 h) with 16 time points in 25 AD patients taking their usual hydrocortisone dose and in 26 healthy controls. The median (interquartile range) area under the curve (AUC) for cortisol was not different for patients, compared with controls [55.63 (32.91-151.07) nmol*min*l-1 vs. 37.49 (27.41-52.00) nmol*min*l-1; p=0.098, respectively], whereas the peak cortisol Cmax was higher in patients [32.61 (5.75-146.19) nmol/l vs. 8.96 (6.96-12.23) nmol/l; p=0.013], compared with controls. The AUC for cortisone [23.65 (6.10-54.76) nmol*min*l-1 vs. 227.73 (200.10-280.52) nmol*min*l-1; p≤ 0.001, respectively], and peak cortisone Cmax was lower in patients than in controls [11.11 (2.91-35.85) nmol/l vs. 33.12 (25.97-39.95) nmol/l; p=0.002]. The AUC for salivary cortisol and salivary cortisone were not correlated with any measures of hydrocortisone dose. The time-course and AUC of salivary cortisol were similar between Addison's patients and healthy controls. Patients had substantially lower salivary cortisone AUC, compared to healthy controls. Salivary cortisol AUC and pharmacokinetics were not related to hydrocortisone dose and thus are not likely useful markers for the adequacy of hydrocortisone replacement.


Asunto(s)
Enfermedad de Addison/tratamiento farmacológico , Cortisona/metabolismo , Terapia de Reemplazo de Hormonas , Hidrocortisona/metabolismo , Hidrocortisona/uso terapéutico , Saliva/metabolismo , Adulto , Biomarcadores/metabolismo , Estudios de Casos y Controles , Cortisona/farmacocinética , Femenino , Humanos , Masculino , Persona de Mediana Edad , Factores de Tiempo , Adulto Joven
2.
Crit Rev Clin Lab Sci ; 51(1): 46-62, 2014 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-24405372

RESUMEN

Atherosclerosis is strongly associated with dyslipoproteinaemia, and especially with increasing concentrations of low-density lipoprotein and decreasing concentrations of high-density lipoproteins. Its association with increasing concentrations of plasma triglyceride is less clear but, within the mixed hyperlipidaemias, dysbetalipoproteinaemia (Fredrickson type III hyperlipidaemia) has been identified as a very atherogenic entity associated with both premature ischaemic heart disease and peripheral arterial disease. Dysbetalipoproteinaemia is characterized by the accumulation of remnants of chylomicrons and of very low-density lipoproteins. The onset occurs after childhood and usually requires an additional metabolic stressor. In women, onset is typically delayed until menopause. Clinical manifestations may vary from no physical signs to severe cutaneous and tendinous xanthomata, atherosclerosis of coronary and peripheral arteries, and pancreatitis when severe hypertriglyceridaemia is present. Rarely, mutations in apolipoprotein E are associated with lipoprotein glomerulopathy, a condition characterized by progressive proteinuria and renal failure with varying degrees of plasma remnant accumulation. Interestingly, predisposing genetic causes paradoxically result in lower than average cholesterol concentration for most affected persons, but severe dyslipidaemia develops in a minority of patients. The disorder stems from dysfunctional apolipoprotein E in which mutations result in impaired binding to low-density lipoprotein (LDL) receptors and/or heparin sulphate proteoglycans. Apolipoprotein E deficiency may cause a similar phenotype. Making a diagnosis of dysbetalipoproteinaemia aids in assessing cardiovascular risk correctly and allows for genetic counseling. However, the diagnostic work-up may present some challenges. Diagnosis of dysbetalipoproteinaemia should be considered in mixed hyperlipidaemias for which the apolipoprotein B concentration is relatively low in relation to the total cholesterol concentration or when there is significant disparity between the calculated LDL and directly measured LDL cholesterol concentrations. Genetic tests are informative in predicting the risk of developing the disease phenotype and are diagnostic only in the context of hyperlipidaemia. Specialised lipoprotein studies in reference laboratory centres can also assist in diagnosis. Fibrates and statins, or even combination treatment, may be required to control the dyslipidaemia.


Asunto(s)
Apolipoproteínas E/genética , Hiperlipoproteinemia Tipo III , Humanos , Mutación
3.
Horm Metab Res ; 46(10): 691-6, 2014 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-24799025

RESUMEN

Hypogonadism may complicate Addison's disease (primary hypoadrenalism), but prevalence and metabolic sequelae of hypogonadism in Addison's disease are poorly described. We recruited patients from the South African Addison's disease national registry who received stable replacement doses of hydrocortisone and had no acute illness. Male biochemical testosterone deficiency was defined as an early morning basal testosterone<9.9 nmol/l and premature ovarian failure (POF) when menopause occurred before 40 years of age. Cardiometabolic risk variables were measured in males only. Male hypogonadism prevalence was 33% (14/42), and 10 patients had newly diagnosed hypogonadism. Two untreated patients had elevated FSH or LH (>10 or 12 IU/l). Testosterone deficiency did not correlate with age, disease duration or hydrocortisone dose. Untreated male hypogonadal subjects had a higher (mean ± standard deviation) BMI compared to eugonadal subjects 29.2 ± 4.9 kg/m(2) vs. 24.7 ± 3.4 kg/m(2) (p=0.01) and a higher median (interquartile range) high-sensitive-CRP 6.4 (2.5-14.0) mg/l vs. 1.45 (0.6-2.8) mg/l (p=0.002). There were no differences between the 2 groups in lipids, lipoproteins and fasting glucose. The median (interquartile range) DHEAS was lower in the hypogonadal 0.31 (0.27-0.37) µmol/l, compared with the eugonadal group 0.75 (0.50-1.51) µmol/l (p=0.005). POF was documented in 11% of female patients. Male testosterone deficiency was highly prevalent in this cohort and was primarily due to secondary hypogonadism. Only BMI and hs-CRP were increased in untreated male hypogonadal subjects. Male and female hypogonadism appears to be a common complication of Addison's disease and may contribute to its morbidity.


Asunto(s)
Enfermedad de Addison/complicaciones , Hipogonadismo/epidemiología , Hipogonadismo/etiología , Enfermedad de Addison/sangre , Adulto , Anciano , Proteína C-Reactiva/metabolismo , Estudios de Cohortes , Femenino , Hormona Folículo Estimulante/sangre , Humanos , Hipogonadismo/sangre , Hormona Luteinizante/sangre , Masculino , Persona de Mediana Edad , Sudáfrica/epidemiología , Testosterona/sangre
4.
5.
6.
S Afr Med J ; 108(11b): 973-1000, 2018 10 26.
Artículo en Inglés | MEDLINE | ID: mdl-30421699

RESUMEN

South Africa (SA) is home to a heterogeneous population with a wide range of cardiovascular risk factors. Cholesterol reduction in combination with aggressive management of modifiable risk factors, including nutrition, physical activity, blood pressure and smoking, can help to reduce and prevent morbidity and mortality in individuals who are at increased risk of cardiovascular events. This updated consensus guide to management of dyslipidaemia in SA is based on the updated European Society of Cardiology and European Atherosclerosis Society dyslipidaemia guidelines published in 2016. For individuals who are not considered to be at high or very high cardiovascular risk, the decision whether to treat and which interventional strategy to use is based on a cardiovascular risk score calculated using total cholesterol, high-density lipoprotein cholesterol (HDL-C), gender, age and smoking status. The cardiovascular risk score refers to the 10-year risk of any cardiovascular event and includes 4 categories of risk (low, moderate, high and very high). People with established cardiovascular disease, diabetes mellitus, chronic kidney disease and genetic or severe dyslipidaemias are considered to already be at high or very high risk and do not require risk scoring. Therapeutic lifestyle change is the mainstay of management for all patients. The need for and intensity of drug therapy is determined according to baseline low-density lipoprotein (LDL-C) levels and the target LDL-C concentration appropriate to the individual. LDL-C treatment targets are based on pre-treatment risk and are as follows: <3 mmol/L in low- and moderate risk cases; <2.5 mmol/L and a reduction of at least 50% if the baseline concentration is 2.5 - 5.2 mmol/L in high-risk cases; and <1.8 mmol/L and a reduction of at least 50% if the baseline concentration is 1.8 - 3.5 mmol/L in very high-risk cases. A statin is usually recommended first-line; the specific agent is based on the required degree of cholesterol reduction, comorbidities and co-prescribed medication. Special attention should be paid to children with a family history of genetic or severe dyslipidaemia, who should be screened for dyslipidaemia from 8 years of age. In SA, HIV infection is not considered to be a significant cardiovascular risk factor and treatment recommendations for HIV-positive individuals are the same as for the general population, with careful choice of pharmacotherapy to avoid potential adverse drug-drug interactions. The benefit of statins in individuals older than 70 years is uncertain and clinical judgement should be used to guide treatment decisions and to avoid side-effects and overmedication in this group.


Asunto(s)
Enfermedades Cardiovasculares , Dislipidemias , Inhibidores de Hidroximetilglutaril-CoA Reductasas , Tamizaje Masivo/métodos , Manejo de Atención al Paciente , Conducta de Reducción del Riesgo , Enfermedades Cardiovasculares/epidemiología , Enfermedades Cardiovasculares/prevención & control , Enfermedades Cardiovasculares/psicología , HDL-Colesterol/sangre , LDL-Colesterol/sangre , Consenso , Dislipidemias/sangre , Dislipidemias/epidemiología , Dislipidemias/terapia , Humanos , Inhibidores de Hidroximetilglutaril-CoA Reductasas/administración & dosificación , Inhibidores de Hidroximetilglutaril-CoA Reductasas/efectos adversos , Manejo de Atención al Paciente/métodos , Manejo de Atención al Paciente/normas , Medición de Riesgo/métodos , Factores de Riesgo , Sudáfrica
9.
Atherosclerosis ; 240(2): 408-14, 2015 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-25897792

RESUMEN

OBJECTIVE: Lomitapide (a microsomal triglyceride transfer protein inhibitor) is an adjunctive treatment for homozygous familial hypercholesterolaemia (HoFH), a rare genetic condition characterised by elevated low-density lipoprotein-cholesterol (LDL-C), and premature, severe, accelerated atherosclerosis. Standard of care for HoFH includes lipid-lowering drugs and lipoprotein apheresis. We conducted a post-hoc analysis using data from a Phase 3 study to assess whether concomitant apheresis affected the lipid-lowering efficacy of lomitapide. METHODS: Existing lipid-lowering therapy, including apheresis, was to remain stable from Week -6 to Week 26. Lomitapide dose was escalated on the basis of individual safety/tolerability from 5 mg to 60 mg a day (maximum). The primary endpoint was mean percent change in LDL-C from baseline to Week 26 (efficacy phase), after which patients remained on lomitapide through Week 78 for safety assessment and further evaluation of efficacy. During this latter period, apheresis could be adjusted. We analysed the impact of apheresis on LDL-C reductions in patients receiving lomitapide. RESULTS: Of the 29 patients that entered the efficacy phase, 18 (62%) were receiving apheresis at baseline. Twenty-three patients (13 receiving apheresis) completed the Week 26 evaluation. Of the six patients who discontinued in the first 26 weeks, five were receiving apheresis. There were no significant differences in percent change from baseline of LDL-C at Week 26 in patients treated (-48%) and not treated (-55%) with apheresis (p = 0.545). Changes in Lp(a) levels were modest and not different between groups (p = 0.436). CONCLUSION: The LDL-C lowering efficacy of lomitapide is unaffected by lipoprotein apheresis.


Asunto(s)
Anticolesterolemiantes/administración & dosificación , Bencimidazoles/administración & dosificación , Eliminación de Componentes Sanguíneos/métodos , LDL-Colesterol/sangre , Homocigoto , Hiperlipoproteinemia Tipo II/terapia , Adulto , Anticolesterolemiantes/efectos adversos , Bencimidazoles/efectos adversos , Biomarcadores/sangre , Eliminación de Componentes Sanguíneos/efectos adversos , Terapia Combinada , Femenino , Predisposición Genética a la Enfermedad , Humanos , Hiperlipoproteinemia Tipo II/sangre , Hiperlipoproteinemia Tipo II/diagnóstico , Hiperlipoproteinemia Tipo II/genética , Lipoproteína(a)/sangre , Masculino , Fenotipo , Factores de Tiempo , Resultado del Tratamiento , Adulto Joven
10.
J Interferon Cytokine Res ; 17(11): 695-700, 1997 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-9402107

RESUMEN

Tumor cells are protected from antibody-dependent complement-mediated lysis by membrane-bound regulators of complement activation (m-RCA). m-RCA are expressed on uveal melanoma cells. We determined whether cytokine treatment affects expression of m-RCA on these cells in vitro. m-RCA expression on uveal melanoma cell lines was studied by flow cytometry, using monoclonal antibodies directed against CD46, CD55, and CD59. Cytokines studied were interferon-alpha (IFN-alpha), IFN-gamma, interleukin-1B (IL-1B), IL-12, and tumor necrosis factor-alpha (TNF-alpha). All three m-RCA were expressed on the uveal melanoma cell lines (CD59>>CD46>CD55), although in variable amounts. With a few exceptions, the cytokines had no effect on m-RCA expression. CD55 expression was not influenced by any of the cytokines. IFN-gamma downregulated expression of CD46 on one cell line (p < 0.01). TNF-alpha upregulated CD59 expression on two of the five cell lines (p < 0.012 and p < 0.001, respectively), which effect was dose dependent. IFN-alpha, IFN-gamma, IL1-beta, IL12, and TNF-alpha had limited effects on m-RCA expression on uveal melanoma cells in vitro.


Asunto(s)
Antineoplásicos/uso terapéutico , Proteínas del Sistema Complemento/metabolismo , Citocinas/uso terapéutico , Melanoma/tratamiento farmacológico , Proteínas de la Membrana/metabolismo , Neoplasias de la Úvea/tratamiento farmacológico , Ensayos de Selección de Medicamentos Antitumorales , Humanos , Interferones/uso terapéutico , Interleucinas/uso terapéutico , Melanoma/metabolismo , Células Tumorales Cultivadas , Factor de Necrosis Tumoral alfa/uso terapéutico , Neoplasias de la Úvea/metabolismo
11.
Invest Ophthalmol Vis Sci ; 38(9): 1865-72, 1997 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-9286277

RESUMEN

PURPOSE: Because the expression of human leukocyte antigen (HLA) antigens is important for immunologic recognition of tumor cells, we determined expression of locus-specific HLA class I antigens in uveal melanoma and tested whether the level of HLA expression was related to prognosis or associated with known prognostic parameters. METHODS: Expression of HLA-A and -B antigens was determined on 30 formalin-fixed and paraffin-embedded sections of uveal melanoma by immunohistochemistry with locus-specific monoclonal antibodies and scored semiquantitatively. RESULTS: The level of expression of HLA-A and -B varied between uveal melanomas. Expression levels of HLA-A and -B were significantly correlated (P = 0.02). High HLA-B expression was significantly correlated with the presence of epithelioid cells (P = 0.04) in the tumor. Expression levels of HLA-A as well as of HLA-B, cell type, mitotic rate, Mib-1 score, and largest tumor diameter were significant predictive factors for survival. High expression of HLA-A and -B was associated with a decreased survival. Multiple Cox regression analysis with stepwise selection of covariates showed that the contribution of HLA-A expression to survival (P = 0.0003) exceeded that of tumor diameter (P = 0.02) and Mib-1 score (P = 0.04). CONCLUSIONS: Lack of expression of HLA-A as well as of HLA-B antigens on uveal melanoma is correlated with a better patient survival. Our data suggest that shedding of uveal melanoma micrometastases with a low expression of HLA class I into the systemic circulation may facilitate their removal and prevent the development of metastases. These findings support a protective role for natural killer cells in the development of metastatic disease in uveal melanoma.


Asunto(s)
Biomarcadores de Tumor/metabolismo , Antígenos HLA-A/metabolismo , Antígenos HLA-B/metabolismo , Melanoma/metabolismo , Neoplasias de la Úvea/metabolismo , Adolescente , Adulto , Anciano , Femenino , Humanos , Técnicas para Inmunoenzimas , Masculino , Melanoma/mortalidad , Melanoma/patología , Persona de Mediana Edad , Pronóstico , Estudios Retrospectivos , Tasa de Supervivencia , Neoplasias de la Úvea/mortalidad , Neoplasias de la Úvea/patología
12.
Invest Ophthalmol Vis Sci ; 37(9): 1884-91, 1996 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-8759358

RESUMEN

PURPOSE: To identify the presence of membrane-bound regulators of complement activation (m-RCA) on uveal melanomas and uveal melanoma cell lines and to examine their role in the inhibition of complement-mediated lysis in vitro. METHODS: Immunohistochemistry and flow cytometric analysis with monoclonal antibodies directed against m-RCA CD46, CD55, and CD59 were applied to tissue sections of 10 uveal melanomas, three primary uveal melanoma cell lines, and one uveal melanoma metastatic cell line. A microcytotoxicity test was used for measuring antibody-dependent complement-mediated lysis. RESULTS: The tissue sections and all four uveal melanoma cell lines expressed CD46, CD55, and CD59. Complement-mediated lysis in the presence of human complement was increased after partial removal of the m-RCA CD55 and CD59 with phosphatidylinositol-specific phospholipase C from the uveal melanoma cell line 92-1. CONCLUSIONS: These results demonstrate that CD46, CD55, and CD59 are expressed in uveal melanomas and that CD55 or CD59, or both, plays a role in resistance to complement-mediated cytotoxicity. The finding that m-RCA are expressed in uveal melanomas may have implications for the effectiveness of the anti-tumor response and in the therapeutic application of monoclonal antibodies directed against tumor-associated antigens.


Asunto(s)
Antígenos CD/análisis , Antígenos CD55/análisis , Antígenos CD59/análisis , Activación de Complemento , Proteínas Inactivadoras de Complemento/análisis , Melanoma/inmunología , Glicoproteínas de Membrana/análisis , Neoplasias de la Úvea/inmunología , Anciano , Anticuerpos Monoclonales , Citotoxicidad Celular Dependiente de Anticuerpos , Línea Celular , Membrana Celular/inmunología , Membrana Celular/patología , Neoplasias de la Coroides/inmunología , Neoplasias de la Coroides/patología , Femenino , Citometría de Flujo , Antígenos de Histocompatibilidad Clase I/análisis , Humanos , Inmunohistoquímica , Linfocitos/inmunología , Masculino , Melanoma/patología , Proteína Cofactora de Membrana , Persona de Mediana Edad , Neoplasias de la Úvea/patología
13.
Invest Ophthalmol Vis Sci ; 38(12): 2523-30, 1997 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-9375571

RESUMEN

PURPOSE: Metastatic uveal melanoma is strongly resistant to chemotherapy, and multidrug resistance (MDR) may be involved. To investigate the role of MDR, the presence of the MDR-associated proteins P-glycoprotein (Pgp), MRP, and lung resistance protein (LRP) was determined on primary choroidal melanomas and cell lines. METHODS: A panel of primary choroidal melanomas was examined for the presence of MDR-associated proteins by immunohistochemical analysis. In cell lines established from four primary choroidal melanomas and one metastatic choroidal melanoma, the expression of MDR-associated proteins was determined with monoclonal antibodies in cytospin preparations and flow cytometry. In addition, the functional capacities of transporter proteins Pgp and MRP as adenosine triphosphate-driven efflux pumps were determined by measuring the cellular accumulation and efflux of the fluorescent dyes rhodamine 123 and calcein-AM, with and without the presence of specific pump inhibitors PSC833 and probenecid. RESULTS: Low levels of Pgp and MRP were detected in most primary tumors and in some cell lines. Measurable transporter function of Pgp could be determined in cell line OCM-1. Lung-resistance protein was present in all primary tumors and cell lines and showed high expression levels. CONCLUSIONS: This study revealed the involvement of LRP and at least a minor role of Pgp and MRP in chemoresistance of choroidal melanoma. Compared with cutaneous melanomas, uveal melanomas appear to express slightly higher levels of Pgp. These findings provide insights into the drug-resistant phenotype of this disease and can aid in the design of therapeutic protocols.


Asunto(s)
Miembro 1 de la Subfamilia B de Casetes de Unión a ATP/metabolismo , Transportadoras de Casetes de Unión a ATP/metabolismo , Neoplasias de la Coroides/metabolismo , Resistencia a Múltiples Medicamentos , Melanoma/metabolismo , Proteínas de Neoplasias/metabolismo , Partículas Ribonucleoproteicas en Bóveda , Anticuerpos Monoclonales , Antineoplásicos/farmacología , Neoplasias de la Coroides/tratamiento farmacológico , Neoplasias de la Coroides/patología , Citometría de Flujo , Fluoresceínas/metabolismo , Colorantes Fluorescentes/metabolismo , Humanos , Técnicas para Inmunoenzimas , Melanoma/tratamiento farmacológico , Melanoma/patología , Proteínas Asociadas a Resistencia a Múltiples Medicamentos , Rodamina 123 , Rodaminas/metabolismo , Células Tumorales Cultivadas
14.
Cancer Lett ; 112(2): 239-43, 1997 Jan 30.
Artículo en Inglés | MEDLINE | ID: mdl-9066734

RESUMEN

Our objective was to investigate whether photodynamic therapy (PDT) influences the expression of HLA Class I and beta 2-microglobulin molecules on cultured uveal melanoma cells. Uveal melanoma cells were incubated with hematoporphyrin esters (HPE) and illuminated using red light. HLA expression on cells was determined by flowcytometry. PDT treatment induced an immediate reduction in expression of HLA Class I and beta 2-microglobulin, followed by a transient increase in expression after 2 h. Normalization occurred after 6 h. Treatment of ocular melanoma cells with PDT temporally alters the expression of HLA Class I and beta 2-microglobulin, which may affect anti-tumor-immune responses.


Asunto(s)
Antígenos de Neoplasias/biosíntesis , Antígenos de Histocompatibilidad Clase I/biosíntesis , Melanoma/tratamiento farmacológico , Melanoma/metabolismo , Fotoquimioterapia , Neoplasias de la Úvea/tratamiento farmacológico , Neoplasias de la Úvea/metabolismo , Citometría de Flujo , Hematoporfirinas/farmacología , Humanos , Fármacos Fotosensibilizantes/farmacología , Células Tumorales Cultivadas , Microglobulina beta-2/biosíntesis
15.
Br J Ophthalmol ; 81(11): 989-93, 1997 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-9505825

RESUMEN

BACKGROUND: The level of HLA expression on a tumour may influence the immunological response against this tumour, and vice versa. HLA expression was determined in a primary uveal melanoma, its metastases, and on a cell line derived from this melanoma, and the presence and type of infiltrate in tissue sections were also studied. METHODS: Immunohistochemistry with monoclonal antibodies (MAbs) against HLA class I and II, T cells, NK cells, and macrophages. RESULTS: Primary and metastatic lesions, as well as the cell line showed high levels of expression of the monomorphic determinants of HLA class I. Expression of the polymorphic HLA-A2 and HLA-A3 antigens was decreased on metastases to the skin and liver. HLA-Bw4 expression was low on all lesions, as well as expression of HLA class II. Tumour infiltrating cells consisted mainly of CD3, CD4, and CD8 positive cells. Expression on the cell line corresponded to expression on the primary tumour. CONCLUSION: The primary uveal melanoma as well as the cell line showed a high expression of monomorphic and polymorphic HLA-A antigens, while metastases showed a high expression of monomorphic and a lower expression of polymorphic antigens. This variation in expression may support tumour cell escape from NK cells as well as CTL mediated lysis.


Asunto(s)
Antígenos de Neoplasias/análisis , Antígenos de Histocompatibilidad Clase II/análisis , Antígenos de Histocompatibilidad Clase I/análisis , Melanoma/inmunología , Neoplasias de la Úvea/inmunología , Anciano , Antígenos de Neoplasias/genética , Femenino , Expresión Génica , Neoplasias Cardíacas/inmunología , Neoplasias Cardíacas/patología , Antígenos de Histocompatibilidad Clase I/genética , Antígenos de Histocompatibilidad Clase II/genética , Humanos , Inmunohistoquímica , Neoplasias Hepáticas/inmunología , Neoplasias Hepáticas/patología , Melanoma/secundario , Neoplasias Cutáneas/inmunología , Neoplasias Cutáneas/patología , Células Tumorales Cultivadas , Neoplasias de la Úvea/patología
16.
Melanoma Res ; 7(2): 103-9, 1997 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-9167175

RESUMEN

Hyperthermia is used as a new treatment modality for ocular melanoma. We wondered whether this treatment would affect the antigenicity of melanoma cells and studied the effect of hyperthermia on the expression of histocompatibility antigens (HLA), beta 2-microglobulin, as well as heat-shock proteins (HSP-60 and HSP-70) on choroidal melanoma cells. Uveal melanoma cell lines were exposed to different temperatures (39-45 degrees C) in a waterbath. Antigen expression was determined with fluorescence-activated cell sorting analysis, using monoclonal antibodies against HLA and HSP. In a 51Cr-release cytotoxicity assay we studied the effect of heat on natural killer (NK) cell susceptibility. Exposure to 45 degrees C for 30 min reduced expression of HLA class I antigens and beta 2-microglobulin. A greater reduction was observed after longer exposure times. Expression of HSP-70 was increased after exposure to 45 degrees C at all time intervals, while expression of HSP-60 was not induced by heat treatment. We did not find a significant difference in the NK cell susceptibility between heated and unheated cells. Hyperthermia has a time- and temperature-dependent effect on expression of HLA class I and HSP-70 molecules on the cell surface of uveal melanoma cells. Hyperthermia did not alter the susceptibility to NK cell lysis.


Asunto(s)
Chaperonina 60/biosíntesis , Neoplasias del Ojo/metabolismo , Proteínas HSP70 de Choque Térmico/biosíntesis , Antígenos de Histocompatibilidad Clase I/biosíntesis , Células Asesinas Naturales/inmunología , Melanoma/metabolismo , Células Cultivadas , Neoplasias de la Coroides/inmunología , Neoplasias de la Coroides/metabolismo , Citotoxicidad Inmunológica , Neoplasias del Ojo/inmunología , Citometría de Flujo , Regulación Neoplásica de la Expresión Génica , Calor , Humanos , Hipertermia Inducida , Melanoma/inmunología , Factores de Tiempo , Células Tumorales Cultivadas , Neoplasias de la Úvea/inmunología , Neoplasias de la Úvea/metabolismo , Microglobulina beta-2/biosíntesis
17.
Melanoma Res ; 9(3): 297-302, 1999 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-10465586

RESUMEN

Transpupillary thermotherapy (TTT) is a new treatment modality for uveal melanoma. We studied whether application of TTT influences the immunogenicity of the tumour cells in vivo or the expression of molecules related to apoptosis. Immunohistochemistry using monoclonal antibodies directed against HLA molecules, HMB45, P53, Fas ligand (FasL), Fas, Bcl-2 and tumour-infiltrating cells was applied to sections of an enucleated eye containing a uveal melanoma that received TTT 1 week before enucleation. The innermost part of the tumour which had been exposed directly to the laser treatment showed no staining for HLA antigens, nor for Fas or FasL epitopes. The intermediate part of the tumour showed a wet necrosis and HLA expression similar to the expression in the peripheral tumour. A large number of macrophages were observed in the necrotic as well as the intact tumour tissue, especially bordering the wet necrotic area. FasL and Bcl-2 were only expressed in the viable, outer part of the tumour. This immunological evaluation of one case of uveal melanoma treated with TTT revealed that TTT may not only have a direct destructive effect on the primary tumour, but may also influence the immunogenicity of uveal melanoma cells, induce infiltration of macrophages into the tumour, and induce apoptosis. The presence of many macrophages suggests that they play a role in the removal of the TTT-treated tumour tissue by phagocytosis.


Asunto(s)
Apoptosis , Neoplasias de la Coroides/inmunología , Neoplasias de la Coroides/terapia , Hipertermia Inducida , Melanoma/inmunología , Melanoma/terapia , Adulto , Antígenos CD/metabolismo , Antígenos de Diferenciación Mielomonocítica/metabolismo , Neoplasias de la Coroides/patología , Proteína Ligando Fas , Femenino , Antígeno HLA-A2/metabolismo , Antígenos de Histocompatibilidad Clase I/inmunología , Antígenos de Histocompatibilidad Clase II/inmunología , Humanos , Inmunohistoquímica , Células Asesinas Naturales/metabolismo , Melanoma/patología , Glicoproteínas de Membrana/metabolismo , Proteínas Proto-Oncogénicas c-bcl-2/metabolismo , Receptor fas/metabolismo
18.
Ned Tijdschr Geneeskd ; 145(17): 834-9, 2001 Apr 28.
Artículo en Holandés | MEDLINE | ID: mdl-11370431

RESUMEN

In two young patients with an elevated temperature, a girl aged 6 months and a boy aged 10 months, purpura and oedema were noticed on the face, ears, arms and legs. On one occasion the boy lost blood anally. A histopathological examination revealed leucocytoclastic vasculitis with fibrin deposits. The diagnosis was 'acute haemorrhagic oedema of infancy' (AHOI), a relatively unknown variant of palpable purpura due to leucocytoclastic vasculitis affecting infants and young children (up to two years of age). AHOI is characterised clinically by marked oedema and fever as well as large palpable purpuric and ecchymotic skin lesions in a target-like pattern mainly on the face, ears and extremities. The skin lesions heal spontaneously within one to three weeks and internal organs are rarely affected. This is in contrast to Henoch-Schönlein purpura, which was observed in a 5-year old boy suffering from similar skin lesions on the legs as well as painful joints, in whom IgA deposits were found in the vasculitis. Henoch-Schönlein purpura is clinically characterised by palpable purpura on the extensor surfaces of the legs and on the buttocks, whereas in AHOI larger purpura and ecchymoses are found on the face, ankles and wrists, with far more extensive oedema. There are also histological differences: in AHOI there is more extensive vasculitis with fibrin deposits and IgA deposits are seen in a minority of cases. Awareness of this relatively unknown form of leucocytoclastic vasculitis will assist in making an early diagnosis possible, thereby avoiding unnecessary treatment and concern.


Asunto(s)
Vasculitis por IgA/diagnóstico , Piel/patología , Vasculitis Leucocitoclástica Cutánea/diagnóstico , Enfermedad Aguda , Preescolar , Diagnóstico Diferencial , Equimosis/etiología , Edema/etiología , Femenino , Fiebre/etiología , Fibrina/análisis , Humanos , Inmunoglobulina A/análisis , Lactante , Masculino , Púrpura/etiología , Síndrome , Vasculitis Leucocitoclástica Cutánea/complicaciones , Vasculitis Leucocitoclástica Cutánea/patología
19.
Eur J Endocrinol ; 168(3): 403-12, 2013 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-23239757

RESUMEN

BACKGROUND: Uncertainty exists whether glucocorticoid receptor (GCR) polymorphisms play a role in steroid-related side effects in Addison's disease (AD) patients on hydrocortisone. The polymorphisms Bcll and N363S appear to increase sensitivity to cortisol, while the ER22/23EK polymorphism has been associated with resistance to cortisol. METHOD: One hundred and forty seven AD patients, and gender, and ethnicity-matched controls were recruited in South Africa. Three polymorphisms in the GCR were studied, using PCR followed by restriction fragment length analysis. Associations with BMI, lipids, glucose and inflammatory markers were investigated. RESULTS: In both patients and controls, the Bcll polymorphism occurred more frequently in whites than in other ethnic groups studied but was not associated with any of the metabolic parameters tested. The ER22/23EK polymorphism was associated with an increased BMI in both patients (29.4 vs 24.7  kg/m²) and control subjects (26.3 vs 24.2  kg/m²). The ER22/23EK polymorphism was also associated with lower LDL cholesterol in control subjects (3.46 vs 3.93  mmol/l) and in patients (3.52 vs 4.10  mmol/l). N363S was associated with increased BMI in controls 29.9  kg/m² vs wild type 24.8  kg/m². Median hydrocortisone doses were greater in patients heterozygous for either ER22/23EK 30.0  mg or N363S 25.0  mg polymorphisms than in wild type patients 20.0  mg (both comparisons). CONCLUSION: Alterations in lipids, BMI and hydrocortisone dose were associated with two polymorphisms. Further larger studies are warranted to corroborate these findings.


Asunto(s)
Enfermedad de Addison/genética , Enfermedad de Addison/fisiopatología , Resistencia a Medicamentos , Hiperlipidemias/etiología , Sobrepeso/complicaciones , Polimorfismo Genético , Receptores de Glucocorticoides/genética , Enfermedad de Addison/complicaciones , Enfermedad de Addison/tratamiento farmacológico , Adulto , Índice de Masa Corporal , Estudios de Cohortes , Relación Dosis-Respuesta a Droga , Femenino , Estudios de Asociación Genética , Glucocorticoides/administración & dosificación , Glucocorticoides/efectos adversos , Glucocorticoides/uso terapéutico , Terapia de Reemplazo de Hormonas/efectos adversos , Humanos , Hidrocortisona/administración & dosificación , Hidrocortisona/efectos adversos , Hidrocortisona/uso terapéutico , Hiperlipidemias/epidemiología , Masculino , Persona de Mediana Edad , Receptores de Glucocorticoides/metabolismo , Factores de Riesgo , Sudáfrica/epidemiología
20.
S Afr Med J ; 98(2): 105-8, 2008 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-18350203

RESUMEN

Lipoprotein lipase deficiency causes severe hypertriglyceridaemia due to chylomicronaemia, and leads to recurrent and potentially life-threatening pancreatitis. This disorder can only be managed by dietary fat restriction as drugs are ineffective. We review the experience with familial chylomicronaemia in patients who attended the lipid clinics at Groote Schuur Hospital and Red Cross Children's War Memorial Hospital in Cape Town. Criteria for inclusion were an initial plasma triglyceride concentration of >15 mmol/l and a typical type I Fredrickson hyperlipidaemia pattern on plasma lipoprotein electrophoresis. A total of 29 patients were seen over 25 years. The mean age of presentation was 10 years, but ranged from 0 to 43 years. The modes of presentation differed: pancreatitis (N=16), eruptive xanthomata (N=2), coincidental detection of hypertriglyceridaemia (N=2), screening relatives (N=7), and after death from pancreatitis (N=1). Plasma triglycerides responded rapidly and dramatically to dietary fat restriction, and some patients sustained good control of the hyperlipidaemia. The onset of pancreatitis was earlier in patients of Indian ancestry, suggesting a genotype/phenotype interaction within this disorder. Genetic work-up indicated founder effects in the Afrikaner and Indian patients. Lipaemic plasma should be taken seriously at all ages, and necessitates work-up at specialised clinics where the diagnosis of chylomicronaemia or type I hyperlipidaemia facilitates appropriate dietary management that can prevent pancreatitis.


Asunto(s)
Hiperlipoproteinemia Tipo I/complicaciones , Hiperlipoproteinemia Tipo I/epidemiología , Hipertrigliceridemia/epidemiología , Hipertrigliceridemia/etiología , Adolescente , Adulto , Niño , Preescolar , Dieta con Restricción de Grasas , Femenino , Efecto Fundador , Humanos , Hipertrigliceridemia/terapia , Hallazgos Incidentales , Lactante , Recién Nacido , Masculino , Tamizaje Masivo , Mutación , Pancreatitis/epidemiología , Pancreatitis/etiología , Grupos Raciales , Sudáfrica/epidemiología , Xantomatosis/epidemiología , Xantomatosis/etiología
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA