Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 64
Filtrar
Mais filtros

Base de dados
Tipo de documento
Intervalo de ano de publicação
1.
Pneumologie ; 76(12): 855-907, 2022 Dec.
Artigo em Alemão | MEDLINE | ID: mdl-36479679

RESUMO

The German Society of Pneumology initiated 2021 the AWMF S1 guideline Long COVID/Post-COVID. In a broad interdisciplinary approach, this S1 guideline was designed based on the current state of knowledge.The clinical recommendations describe current Long COVID/Post-COVID symptoms, diagnostic approaches, and therapies.In addition to the general and consensus introduction, a subject-specific approach was taken to summarize the current state of knowledge.The guideline has an explicit practical claim and will be developed and adapted by the author team based on the current increase in knowledge.


Assuntos
COVID-19 , Síndrome de COVID-19 Pós-Aguda , Humanos
2.
Basic Res Cardiol ; 109(3): 408, 2014 May.
Artigo em Inglês | MEDLINE | ID: mdl-24691762

RESUMO

Adiponectin (APN) is an immunomodulatory adipocytokine that improves outcome in patients with virus-negative inflammatory cardiomyopathy and mice with autoimmune myocarditis. Here, we investigated whether APN modulates cardiac inflammation and injury in coxsackievirus B3 (CVB3) myocarditis. Myocarditis was induced by CVB3 infection of APN-KO and WT mice. APN reconstitution was performed by adenoviral gene transfer. Expression analyses were performed by qRT-PCR and immunoblot. Cardiac histology was analyzed by H&E-stain and immunohistochemistry. APN-KO mice exhibited diminished subacute myocarditis with reduced viral load, attenuated inflammatory infiltrates determined by NKp46, F4/80 and CD3/CD4/CD8 expression and reduced IFNß, IFNγ, TNFα, IL-1ß and IL-12 levels. Moreover, myocardial injury assessed by necrotic lesions and troponin I release was attenuated resulting in preserved left ventricular function. Those changes were reversed by APN reconstitution. APN had no influence on adhesion, uptake or replication of CVB3 in cardiac myocytes. In acute CVB3 myocarditis, cardiac viral load did not differ between APN-KO and WT mice. However, APN-KO mice displayed an enhanced acute immune response, i.e. increased expression of myocardial CD14, IFNß, IFNγ, IL-12, and TNFα resulting in increased cardiac infiltration with pro-inflammatory M1 macrophages and activated NK cells. Up-regulation of cardiac CD14 expression, type I and II IFNs and inflammatory cell accumulation in APN-KO mice was inhibited by APN reconstitution. Our observations indicate that APN promotes CVB3 myocarditis by suppression of toll-like receptor-dependent innate immune responses, polarization of anti-inflammatory M2 macrophages and reduction of number and activation of NK cells resulting in attenuated acute anti-viral immune responses.


Assuntos
Adiponectina/metabolismo , Infecções por Coxsackievirus/metabolismo , Enterovirus Humano B/imunologia , Miocardite/metabolismo , Miocárdio/metabolismo , Adiponectina/deficiência , Adiponectina/genética , Animais , Animais Recém-Nascidos , Células Cultivadas , Infecções por Coxsackievirus/genética , Infecções por Coxsackievirus/imunologia , Infecções por Coxsackievirus/patologia , Infecções por Coxsackievirus/fisiopatologia , Infecções por Coxsackievirus/virologia , Modelos Animais de Doenças , Enterovirus Humano B/genética , Enterovirus Humano B/patogenicidade , Imunidade Inata , Mediadores da Inflamação/metabolismo , Células Matadoras Naturais/imunologia , Células Matadoras Naturais/metabolismo , Células Matadoras Naturais/virologia , Macrófagos/imunologia , Macrófagos/metabolismo , Macrófagos/virologia , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Miocardite/genética , Miocardite/imunologia , Miocardite/patologia , Miocardite/fisiopatologia , Miocardite/virologia , Miocárdio/imunologia , Miocárdio/patologia , Necrose , Ratos , Ratos Wistar , Receptores Toll-Like/metabolismo , Função Ventricular Esquerda , Carga Viral
3.
Leukemia ; 19(5): 835-40, 2005 May.
Artigo em Inglês | MEDLINE | ID: mdl-15744340

RESUMO

The activation of natural killer (NK) cells leads to degranulation and secretion of cytotoxic granula. During this process, the lytic granule membrane protein CD107a becomes detectable at the cell surface. Based on this phenomenon, we have analyzed by a novel flow cytometry-based assay, the number and phenotype of NK cells responding to tumor targets. Using human leukemia and lymphoma cell lines, we observed a close correlation between CD107a surface expression and target cell lysis, indicating that NK cell cytotoxicity can be assessed by this method. The number of degranulating NK cells was closely related to the ratio of effector and target cells and showed a maximum at a ratio of 1:1. Moreover, we were able to show that the population of CD56(dim)/CD16(neg) NK cells is primarily responsible for the cytotoxic activity against tumor targets whereas neither CD56(dim)/CD16(pos) nor CD56(bright) NK cells degranulated in response to the cell lines. Our results indicate that the CD107a assay represents a promising new method for the quantification and characterization of cells exhibiting natural cytotoxicity.


Assuntos
Antígeno CD56/metabolismo , Citotoxicidade Imunológica , Imunidade Inata , Células Matadoras Naturais/imunologia , Leucemia/imunologia , Antígenos CD/análise , Antígenos CD/biossíntese , Antígenos CD/genética , Antígeno CD56/análise , Degranulação Celular/imunologia , Linhagem Celular Tumoral , Citometria de Fluxo , Humanos , Células Matadoras Naturais/metabolismo , Proteína 1 de Membrana Associada ao Lisossomo , Proteínas de Membrana Lisossomal , Fenótipo
4.
Leukemia ; 19(8): 1318-23, 2005 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-15920488

RESUMO

The transcription factor Wilms' tumour gene 1 (WT1) is important as a prognostic marker as well as in the detection and monitoring of minimal residual disease in leukaemia and myelodysplastic syndromes. Evidence has accumulated over the past decade to show that WT1 is a key molecule for tumour proliferation in a large number of human neoplasms most prominent in acute leukaemias, making it a suitable target for therapeutic strategies. Based on animal results, showing safety and efficacy of immunization with WT1 peptides and protein, early clinical trials in leukaemia have recently been initiated. The First International Conference on WT1 in Human Neoplasia was held in Berlin, March 11--12, 2004. This report reviews the current knowledge on the role of WT1 in tumour promotion and as a diagnostic and therapeutic target, and summarizes the data presented and discussed in this meeting.


Assuntos
Neoplasias/etiologia , Proteínas WT1/fisiologia , Animais , Genes do Tumor de Wilms , Humanos , Imunoterapia , Leucemia/diagnóstico , Leucemia/etiologia , Leucemia/terapia , Neoplasias/diagnóstico , Neoplasias/terapia
5.
Cancer Res ; 55(18): 4065-8, 1995 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-7664281

RESUMO

Malignant melanoma cells can be detected with high sensitivity in peripheral blood of patients using reverse transcription-PCR. The detection of tyrosinase mRNA that is actively expressed only in melanocytes and melanoma cells indicates the presence of melanoma cells in peripheral blood. As shown previously, tyrosinase transcripts can be found in a variety of patients with metastatic malignant melanoma. For semiquantitative analysis of these cells in peripheral blood and evaluation of possible influence of immunotherapy on the amount of circulating cells, we describe an assay combining reverse transcription-PCR and Southern blotting. In this system, the amount of circulating tumor cells was determined by interpolating the amplified tyrosinase signal strength of patient samples to an equivalent tyrosinase signal of diluted SK-mel 28 cells. We found that the amount of circulating tumor cells correlates with the tumor burden. Furthermore, in patients with regression of melanoma metastases after immunotherapy, a decrease of the amount of tumor cells in the peripheral blood was observed. Quantitative estimates of residual disease may be an accurate and sensitive predictor for the clinical course.


Assuntos
Melanoma/patologia , Células Neoplásicas Circulantes , Reação em Cadeia da Polimerase , Sequência de Bases , Humanos , Imunoterapia , Melanoma/terapia , Dados de Sequência Molecular , Monofenol Mono-Oxigenase/genética , RNA Mensageiro/análise , Células Tumorais Cultivadas
6.
Cancer Res ; 60(17): 4850-4, 2000 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-10987297

RESUMO

The antigens epithelial cell adhesion molecule (Ep-CAM), her-2/neu, and carcinoembryonic antigen (CEA) are potential T-cell targets in antigen-specific vaccination-based cancer therapy. We performed this study to evaluate whether a natural specific T-cell response against these tumor-associated antigens (TAAs) already exists in patients with colorectal carcinoma (CRC). We used the IFN-gamma ELISPOT assay to detect circulating TAA-reactive T cells directly ex vivo in unstimulated peripheral blood mononuclear cells. We analyzed the T-cell response in peripheral blood mononuclear cells of 22 HLA-A2-positive patients with CRC and 8 HLA-A2-positive healthy subjects against 3 HLA A2-restricted peptide epitopes of the TAAs Ep-CAM (GLKAGVIAV), her-2/neu (IISAVVGIL), and CEA (YLSGANLNL). Seven of 22 patients but none of the 8 healthy subjects had T cells specifically secreting IFN-gamma in response to one to three of these antigens (n = 4, Ep-CAM; n = 5, her-2/neu; n = 6, CEA). In three of the seven responding patients, TAA-reactive T cells were further characterized by flow cytometry. In all three patients, the majority of these T cells have a CD3+CD8+IFN-gamma+CD69+CD45RA+ phenotype, resembling activated effector-type T cells. T-cell responses occurred only in patients with metastatic disease (Dukes' stages C and D). The results of this study indicate that natural T-cell responses against TAAs occur in approximately one-half of CRC patients with involvement of lymph nodes or distant metastases, but not in CRC patients with disease confined to the intestinum.


Assuntos
Antígenos de Neoplasias/imunologia , Neoplasias Colorretais/imunologia , Ativação Linfocitária/imunologia , Linfócitos T/imunologia , Anticorpos Monoclonais/imunologia , Anticorpos Monoclonais/farmacologia , Antígeno Carcinoembrionário/imunologia , Moléculas de Adesão Celular/imunologia , Neoplasias Colorretais/sangue , Neoplasias Colorretais/patologia , Ensaio de Imunoadsorção Enzimática/métodos , Molécula de Adesão da Célula Epitelial , Epitopos de Linfócito T/imunologia , Feminino , Citometria de Fluxo , Antígeno HLA-A2/imunologia , Humanos , Masculino , Estadiamento de Neoplasias , Fragmentos de Peptídeos/imunologia , Fragmentos de Peptídeos/farmacologia , Receptor ErbB-2/imunologia
7.
Cancer Res ; 50(23): 7450-6, 1990 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-1701343

RESUMO

Cells of the macrophage lineage are considered to be of special importance in the defense of the host against tumor development and spread. Immunotherapeutic strategies to stimulate macrophage (MAC) tumor cytotoxicity make use of activating compounds such as gamma-interferon which are given systemically. However, there are several lines of evidence that in malignant disease the generation of cytotoxic effector MACs is impaired. Both defective cell maturation and loss of responsiveness to activation are described. Here, a first clinical phase I trial of adoptive immunotherapy in cancer patients using autologous MACs generated in vitro from blood monocytes (MOs) is reported. Mononuclear cells were isolated by cytapheresis and density centrifugation and cultured in hydrophobic Teflon bags for 7 days with 2% autologous serum and recombinant human gamma-interferon being present for the last 18 h. Cytotoxic MO-derived MACs were then purified by countercurrent elutriation and reinfused into the patient. A total of 72 therapies have been performed with patients being treated i.v. (n = 8) and i.p. (n = 7). In vitro generated MACs proved to be mature as judged by the expression of maturation-associated surface molecules (MAX antigens, CD16, CD51, CD71), were cytotoxic to U937 tumor cells, and were efficient secretory cells. Cell dose escalation was performed in the first patients beginning with 10(8) MACs to finally infuse the total number of cells recovered from one single cycle of isolation and culture. MAC yield varied from 1 to 17 x 10(8) representing 13-79% of MOs initially seeded. Adoptive MAc transfer was well tolerated. Side effects observed were low-grade fever (less than 38.5 degrees C), induction of the coagulation cascade, and abdominal discomfort after i.p. application. The procoagulant activity of MAC autografts was cell dose dependent and demonstrated by detection of circulating fibrin monomers and thrombin-antithrombin complexes. Biological responses observed included elevated serum neopterin levels and the appearance of interleukin-6 in sera and ascitic fluids. Indication of a possible therapeutic effect was only observed in i.p.-treated patients and consisted of disappearance of malignant ascites in 2 of 7 patients.


Assuntos
Imunoterapia Adotiva , Macrófagos/imunologia , Neoplasias/terapia , Adulto , Idoso , Biopterinas/análogos & derivados , Biopterinas/metabolismo , Transfusão de Sangue , Carcinoma/terapia , Diferenciação Celular , Centrifugação com Gradiente de Concentração , Relação Dose-Resposta a Droga , Fibronectinas/metabolismo , Fator Estimulador de Colônias de Granulócitos e Macrófagos/metabolismo , Humanos , Imunoterapia Adotiva/efeitos adversos , Injeções Intraperitoneais , Injeções Intravenosas , Interferon gama/farmacologia , Interleucina-6/metabolismo , Macrófagos/metabolismo , Macrófagos/transplante , Masculino , Melanoma/terapia , Pessoa de Meia-Idade , Monócitos/efeitos dos fármacos , Neopterina , Proteínas Recombinantes , Transplante Autólogo , Fator de Necrose Tumoral alfa/metabolismo , alfa-Macroglobulinas/metabolismo
8.
J Clin Oncol ; 15(7): 2579-88, 1997 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-9215828

RESUMO

PURPOSE: The combination of interferon alfa-2a (IFN alpha) and high-dose interleukin-2 (IL-2) is active in metastatic melanoma. The addition of cisplatin (CDDP) has resulted in response rates greater than 50%. This study was performed to determine whether the addition of CDDP to a cytokine treatment regimen with IFN alpha and high-dose IL-2 influences survival of patients with metastatic melanoma. PATIENTS AND METHODS: Patients with advanced metastatic melanoma were randomly assigned to receive treatment with IFN alpha 10 x 10(6) U/m2 subcutaneously on days 1 through 5 and a high-dose intravenous decrescendo regimen of IL-2 on days 3 through 8 (18 mIU/ m2/6 hours, 18 mIU/m2/12 hours, 18 mIU/m2/24 hours, and 4.5 mIU/m2/24 hours x 3) without (arm A) or with (arm B) CDDP 100 mg/m2 on day 1. Treatment cycles were repeated every 28 days to a maximum of four cycles. RESULTS: One hundred thirty-eight patients with advanced metastatic melanoma, of whom 87% had visceral metastases, were accrued for the trial. Both regimens were feasible in a multicenter setting. The objective response rate was 18% without and 33% with CDDP (P = .04). The progression-free survival was 53 days without and 92 days with CDDP (P = .02, Wilcoxon; P = .09, log-rank). There was no statistically significant difference in survival between treatment arms, with a median overall survival duration for all patients of 9 months. CONCLUSION: The addition of CDDP to cytokine treatment with IFN alpha and IL-2 does not influence survival of patients with advanced metastatic melanoma, despite a significant increase in response rate and progression-free survival.


Assuntos
Antineoplásicos/uso terapêutico , Melanoma/tratamento farmacológico , Melanoma/secundário , Neoplasias Cutâneas/tratamento farmacológico , Neoplasias Cutâneas/parasitologia , Antineoplásicos/efeitos adversos , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Cisplatino/administração & dosagem , Intervalo Livre de Doença , Esquema de Medicação , Europa (Continente) , Humanos , Interferon alfa-2 , Interferon-alfa/administração & dosagem , Metástase Linfática , Proteínas Recombinantes , Análise de Sobrevida , Resultado do Tratamento
9.
J Clin Oncol ; 16(9): 2921-9, 1998 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-9738559

RESUMO

PURPOSE: In patients with stage IV melanoma, durable responses have been reported with treatment regimens that involve high-dose interleukin-2 (IL-2). We analyze long-term results of 631 melanoma patients from 12 institutions who had received IL-2 alone, in combination with interferon alfa 2a or 2b (IFNalpha), or with cytotoxic drugs. METHODS: Case records that contained pretreatment parameters, response data, and updated survival information were collected. After univariate analysis, the multivariate evaluation of the impact of pretreatment parameters on response and survival was performed by logistic regression and Cox's regression, respectively. RESULTS: Patients were divided into four groups according to treatment: IL-2 alone (n=117), IL-2 and chemotherapy (n=49), IL-2 and IFNalpha (n=153), and IL-2, chemotherapy, and IFNalpha (n=312). The median survival of all patients was 10.5 months and the 2- and 5-year survival rates were 19.9% and 10.4%, respectively. Independent prognostic factors for response and survival were entirely different, treatment group being the only significant factor for response, and serum lactate dehydrogenase (LDH), metastatic site, and performance predicting survival. The addition of IFNalpha to IL-2 was associated with prolonged survival, but the effect of additional chemotherapy was less obvious. CONCLUSION: Serum LDH, metastatic site, and performance status are useful stratification factors for randomized trials in metastatic melanoma. The improved long-term survival rates observed in melanoma patients treated with IL-2/IFNalpha-containing regimens are notable in contrast to the reported 5-year survival rates of 2% to 6% achieved with chemotherapy, but because selection bias cannot be ruled out, the impact of IL-2, as well as all other components of the treatment regimens, on survival needs to be confirmed in prospective randomized trials.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Interleucina-2/uso terapêutico , Melanoma/tratamento farmacológico , Adulto , Ensaios Clínicos Fase I como Assunto , Ensaios Clínicos Fase II como Assunto , Feminino , Humanos , Interferon alfa-2 , Interferon-alfa/administração & dosagem , Interleucina-2/administração & dosagem , L-Lactato Desidrogenase/sangue , Masculino , Melanoma/secundário , Pessoa de Meia-Idade , Análise Multivariada , Estadiamento de Neoplasias , Prognóstico , Proteínas Recombinantes , Análise de Regressão , Análise de Sobrevida
10.
Clin Cancer Res ; 2(4): 767-72, 1996 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-9816229

RESUMO

Limited T-cell receptor (TCR) repertoire of tumor-infiltrating lymphocytes has been found in melanoma metastases and spontaneously regressing melanoma. Immunotherapy with INF-alpha/interleukin 2 can induce tumor regression in a proportion of patients with metastatic melanoma. We analyzed the gene expression of the TCR-beta variable (Vbeta) region of tumor-infiltrating lymphocytes from 16 melanoma metastases by subgroup-specific semiquantitative RNA PCR to investigate the influence of immunotherapy on the TCR pattern. In five progressing metastases before or after immunotherapy, no overexpression of Vbeta gene families was detectable, whereas in seven of seven metastases responding to IFN-alpha/interleukin 2 one to four Vbeta gene families were overexpressed. Preferential usage of certain Vbeta gene subgroups in patients sharing the same HLA class I molecules suggests a T-cell response to dominant public epitopes. Analysis of multiple specimens from the same patients gives evidence that this strong oligoclonal T-cell selection is induced or at least augmented by immunotherapy, supporting the functional relevance of this finding.


Assuntos
Interleucina-2/uso terapêutico , Melanoma/imunologia , Melanoma/secundário , Receptores de Antígenos de Linfócitos T alfa-beta/genética , Humanos , Imunoterapia , Células Matadoras Ativadas por Linfocina/imunologia , Linfócitos do Interstício Tumoral/imunologia , Melanoma/terapia , Reprodutibilidade dos Testes
11.
Clin Cancer Res ; 3(2): 221-6, 1997 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-9815676

RESUMO

An enzyme-linked immunospot (ELISPOT) assay was adapted to detect peptide-specific CD8+ T lymphocytes in peripheral blood mononuclear cells (PBMCs). In HLA-A1-, HLA-A2-, and/or HLA-A3-positive individuals, we determined the release of IFN-gamma on a single cell level in response to three different peptide epitopes derived from the influenza matrix protein and nuclear protein containing the HLA-A2.1- and HLA-A1- or HLA-A3-binding motif, respectively. Comparison of the ELISPOT assay with the standard chromium release assay revealed a close correlation between the number of peptide-specific IFN-gamma-releasing T cells in PBMCs and the level of specific cytotoxicity after 14 days of in vitro expansion. The ELISPOT assay detected T cells with specificity for the HLA-A2. 1-binding epitope derived from the matrix protein in 76% of HLA-A2-positive healthy individuals (n = 25); the median frequency was 41 in 10(6) PBMCs. We also detected peptide-specific T cells in 10 of 12 HLA-A2-positive patients with metastatic melanoma with a median frequency of 20.5 in 10(6) PBMCs. In 10 of 24 HLA-A3-positive individuals and in 2 of 14 HLA-A1-positive individuals, peptide-specific T cells for a HLA-A3- and a HLA-A1-binding epitope derived from the nucleoprotein, respectively, were present. In conclusion, the ELISPOT assay may be suitable to monitor a peptide-specific T-cell response in vaccination protocols using peptides derived from tumor or viral antigens.


Assuntos
Linfócitos T CD8-Positivos/imunologia , Antígenos de Histocompatibilidade Classe I/imunologia , Imunoensaio/métodos , Melanoma/imunologia , Orthomyxoviridae/imunologia , Proteínas Virais/imunologia , Linfócitos T CD8-Positivos/metabolismo , Separação Celular/métodos , Epitopos de Linfócito T/imunologia , Antígeno HLA-A1/metabolismo , Antígeno HLA-A3/metabolismo , Antígenos de Histocompatibilidade Classe I/metabolismo , Humanos , Interferon gama/metabolismo , Melanoma/sangue , Nucleoproteínas/sangue , Nucleoproteínas/imunologia , Orthomyxoviridae/metabolismo , Peptídeos/imunologia , Peptídeos/metabolismo , Subpopulações de Linfócitos T/imunologia , Subpopulações de Linfócitos T/metabolismo
12.
J Leukoc Biol ; 50(1): 35-42, 1991 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-2056245

RESUMO

We were interested in the dependence of constitutive and stimulated cytokine secretion on the stage of macrophage (MAC) differentiation in vitro. Elutriation-purified blood MO were cultured up to 28 days and their secretory repertoire was analyzed under adherence conditions at various culture stages. For each of the cytokines tested, interleukin (IL)-1 beta, IL-6, tumor necrosis factor (TNF)-alpha, and macrophage colony-stimulating factor (M-CSF), a different pattern of regulation was observed. During the initial phase of maturation (up to day 7 in culture) within which the characteristics of normal MO to MAC transformation are achieved, M-CSF was the only cytokine to be secreted constitutively. From the LPS-dependent cytokines, IL-1 beta and IL-6 were downregulated whereas TNF-alpha levels increased severalfold. For the release of IL-1 beta, IL-6, and TNF-alpha a synergistic effect of interferon-gamma (IFN-g) and lipopolysaccharide (LPS) was observed. M-CSF release increased until day 7 in culture with LPS being stimulatory for this particular cytokine only during the first days of differentiation. Upon further cultivation of MAC up to 28 days, LPS-induced IL-1 beta levels remained very low, but IL-6 levels increased again reaching that of blood MO, and TNF-alpha continued to rise reaching levels up to 30-fold higher than in blood MO. M-CSF secretion stayed high with LPS even suppressing constitutive secretion. Long-term cultured MAC started to release IL-6 and TNF-alpha also in the absence of a stimulus and, furthermore, became responsive to IFN-g alone. Our data show that the release of each cytokine investigated is differently regulated during maturation. These results document the functional plasticity of human MAC and emphasize the impact that MO to MAC differentiation may have in vivo.


Assuntos
Interleucina-1/metabolismo , Interleucina-6/metabolismo , Fator Estimulador de Colônias de Macrófagos/metabolismo , Macrófagos/fisiologia , Fator de Necrose Tumoral alfa/metabolismo , Diferenciação Celular , Células Cultivadas , Humanos , Lipopolissacarídeos/farmacologia , Monócitos/citologia
13.
J Leukoc Biol ; 47(6): 490-7, 1990 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-1693647

RESUMO

Cells of the mononuclear phagocyte system arise from circulating blood monocytes. Upon emigration from the vasculature, monocytes differentiate into macrophages, a process that monocytes similarly undergo in vitro. We have established primary cultures from elutriated or adherence-purified blood monocytes and analyzed the antigenic modulation during monocyte to macrophage transformation, which could be followed by the expression of specific antigens and which required as yet unknown inducer signals present in the serum. It is shown that in the absence of serum monocytes only survive in vitro when cultured adherent to plastic but rapidly die in suspension culture. Starting at 0.5%, serum induced maturation dose-dependently, with the optimal concentration being 2 to 5%. Of those antigens not present on monocyte, the low-affinity Fc receptor (CD16), the alpha-chain of the vitronectin receptor (CD51), gp65-MAX.1, and gp68-MAX.3 were expressed only upon serum-induced macrophage differentiation, whereas the transferrin receptor (CD71), MAX.26, and to some degree also gp65-MAX.11 appeared to be independent of maturation and were also found on primary cultures of adherent monocytes under serum-free conditions. In addition, the rapid induction of HLA class II antigens (within 24 hr) was similar with and without serum, as was the continued high-density expression in long-term culture. The monocyte-specific CD14 antigen was down-regulated in the absence of serum but kept its level of expression on differentiated macrophages. In comparison, alveolar and peritoneal macrophages, respectively, differed in their antigenic phenotype: Alveolar macrophages expressed high HLA class II antigens but low CD14, whereas for peritoneal macrophages the opposite was found. Both interferon-gamma and -alpha suppressed macrophage maturation in vitro but had contrary effects on HLA class II and CD16 expression: Interferon-gamma up-regulated the two types of antigens, which, in contrast, were down-regulated by interferon-alpha.


Assuntos
Antígenos de Superfície/genética , Macrófagos/fisiologia , Monócitos/imunologia , Líquido da Lavagem Broncoalveolar/citologia , Diferenciação Celular/efeitos dos fármacos , Células Cultivadas , Regulação para Baixo/efeitos dos fármacos , Crescimento , Humanos , Interferons/farmacologia , Macrófagos/citologia , Monócitos/citologia , Fenótipo
14.
J Invest Dermatol ; 101(6): 887-9, 1993 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-8245518

RESUMO

Patients with malignant melanoma and distant metastases generally have an unfavorable prognosis, with a median survival of about 6 months. The mechanisms of hematogenous spread and implantation of melanoma cells are, however, poorly understood, because the standard diagnostic methods are not sensitive enough to detect oligocellular micrometastases. Recently a method using reverse transcription and polymerase chain reaction to determine tyrosinase mRNA in peripheral blood, which indicates the presence of circulating melanoma cells, has been developed. We utilized this assay to examine blood samples of 56 patients with malignant melanoma in different stages of disease. In one of 10 patients in stage I (localized disease) and in six of 17 patients with regional lymph nodes metastases (stage II) tyrosinase mRNA was detected. Tyrosinase transcripts were found in all 29 patients with distant metastases (stage III). Interestingly, tyrosinase mRNA was also detected in six patients with metastatic amelanotic malignant melanoma. In contrast, tyrosinase mRNA was not detectable in any of 39 healthy subjects or 17 patients with other malignancies. These findings may be helpful to define a patient group at high risk for systemic spread of disease.


Assuntos
Melanoma/genética , Melanoma/patologia , Sequência de Bases , Humanos , Metástase Linfática/diagnóstico , Melanoma/sangue , Métodos , Dados de Sequência Molecular , Monofenol Mono-Oxigenase/genética , Estadiamento de Neoplasias , Reação em Cadeia da Polimerase/métodos , RNA Mensageiro/sangue , Sensibilidade e Especificidade , Transcrição Gênica , Células Tumorais Cultivadas
15.
Eur J Cancer ; 32A(9): 1530-3, 1996 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-8911113

RESUMO

Melanoma patients with very advanced disease have usually not been included in chemo-immunotherapy trials. We report on 22 melanoma patients, including 5 with reduced performance status (Karnofsky PS < 70), 8 with metastatic ocular melanoma, 6 with brain metastases, and 4 who had pretreatment with interleukin-2. These were treated with a combination regimen of dacarbazine (250 mg/m2, days 1-3), cisplatin (30 mg/m2, days 1-3), interferon-alpha 2a (IFN-alpha, 10 Mio IU/m2 s.c., days 1-5) and IL-2 (i.v., 18 Mio IU/m2 for 6, 12, 24 h, followed by 13.5 Mio IU/m2 in 72 h). In the case of brain metastases radiotherapy was added. No grade IV toxicity occurred and no dose reductions were necessary. 21 patients were evaluable for response. 6 (29%) had disease progression, 5 (24%) had partial response and 10 (48%), had stable disease. Sites of response included skin, lymph nodes, muscle, lung, pleura, liver, pancreas, adrenal gland and brain. The described treatment schedule is safe and active even in patients with metastatic melanoma and poor prognosis.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Interferon-alfa/uso terapêutico , Interleucina-2/uso terapêutico , Melanoma/terapia , Adulto , Idoso , Protocolos de Quimioterapia Combinada Antineoplásica/efeitos adversos , Cisplatino/administração & dosagem , Estudos de Coortes , Terapia Combinada/efeitos adversos , Dacarbazina/administração & dosagem , Humanos , Melanoma/secundário , Pessoa de Meia-Idade , Receptores de Interleucina-2/análise , Indução de Remissão , Análise de Sobrevida , Fator de Necrose Tumoral alfa/análise
16.
Eur J Cancer ; 30A(7): 955-8, 1994.
Artigo em Inglês | MEDLINE | ID: mdl-7946591

RESUMO

This evaluation was performed in melanoma patients after successful immunotherapy to describe the pattern of relapse. 63 patients received interferon (IFN)-alpha and high-dose interleukin (IL)-2, resulting in three complete responses (CR), 13 partial responses (PR), three mixed responses (MR) and 17 stable diseases (SD). Median duration of response was 7 months (range 3-28) without surgery. Most relapses occurred at pre-existing sites. Duration of CR was 14-37+ months. In 11 patients, residual tumour lesions were resected. Interestingly, histology revealed almost complete tumour regression in 6 patients, including 2 of 4 with SD. 5 of these 11 patients have relapsed so far, 6 patients are still free of disease with a median of 17 months (range 8-34). Following relapse, 4 of 6 patients responded to retreatment with the identical IFN alpha/IL-2 protocol. The authors conclude that initial disease progression is mostly at previous sites of disease. Resection of residual lesions may offer a chance for extended disease-free survival similar to patients with CR to immunotherapy. Retreatment of relapsing patients is favourable.


Assuntos
Imunoterapia , Interferon-alfa/uso terapêutico , Interleucina-2/uso terapêutico , Melanoma/terapia , Estudos de Coortes , Progressão da Doença , Intervalo Livre de Doença , Seguimentos , Humanos , Melanoma/secundário , Melanoma/cirurgia , Recidiva Local de Neoplasia
17.
Eur J Cancer ; 39(4): 476-80, 2003 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-12751378

RESUMO

This study analyses the frequency and therapy of brain metastases in 94 stage IV melanoma patients after treatment with high-dose interleukin-2 (IL-2) and interferon-alpha (IFN-alpha) within three subsequent trials between 1990 and 1995. Central nervous system (CNS) metastases occurred in 28 patients (30%) during the potential follow-up period of 6 years. Time to occurrence of brain metastases varied between 1 and 53 months, with a median of 10 months. Of 28 patients, 19 had < 5 metastases, which were treated with stereotactic radiosurgery (SR) in 9 patients. In 2 patients, SR was followed by resection. 9 patients had multiple metastases, of which 4 received whole brain irradiation (WBI). Median survival after the detection of CNS metastases was 6 months (95% Confidence Interval (CI) 1-11 months). SR plus resection was associated with a prolonged survival of 34 and 35 months in 2 patients, 1 patient survived for 41 months after WBI, demonstrating the efficacy of these therapeutic strategies.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Neoplasias Encefálicas/secundário , Melanoma/tratamento farmacológico , Melanoma/secundário , Neoplasias Cutâneas/tratamento farmacológico , Neoplasias Encefálicas/terapia , Seguimentos , Humanos , Interferon alfa-2 , Interferon-alfa/administração & dosagem , Interleucina-2/administração & dosagem , Ensaios Clínicos Controlados Aleatórios como Assunto , Proteínas Recombinantes , Neoplasias Cutâneas/patologia , Análise de Sobrevida
18.
Eur J Cancer ; 30A(1): 103-5, 1994.
Artigo em Inglês | MEDLINE | ID: mdl-8142149

RESUMO

A phase lb trial of a novel regional approach to adoptive immunotherapy is reported. Patients with liver metastases received continuous high-dose infusion of interleukin-2 (IL-2) into the splenic artery or intravenous infusion with subsequent transfer of lymphokine-activated killer (LAK) cells into the portal vein or the hepatic artery. Trafficking studies revealed homogeneous distribution of the LAK cells within the liver. The usual side-effects of IL-2 and LAK cells occurred without limiting liver toxicity. One partial (7+ months) and two complete responses (36 and 26+ months) were observed in 9 patients with metastases from cutaneous melanoma. None of 6 patients with metastases from ocular melanoma responded.


Assuntos
Imunoterapia Adotiva/métodos , Interleucina-2/uso terapêutico , Células Matadoras Ativadas por Linfocina/transplante , Neoplasias Hepáticas/secundário , Neoplasias Hepáticas/terapia , Melanoma/patologia , Neoplasias Oculares/patologia , Humanos , Imunoterapia Adotiva/efeitos adversos , Leucaférese , Fígado/imunologia , Neoplasias Cutâneas/patologia
19.
Eur J Cancer ; 39(1): 70-7, 2003 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-12504661

RESUMO

Fifty-seven patients with MAGE-3-positive measurable metastatic cancer, most of them with melanoma, were vaccinated with escalating doses of a recombinant MAGE-3 protein combined with a fixed dose of the immunological adjuvant SBAS-2, which contained MPL and QS21. The immunisation schedule included 4 intramuscular (i.m.) injections at 3-week intervals. Patients whose tumour stabilised or regressed after 4 vaccinations received 2 additional vaccinations at 6-week intervals. The vaccine was generally well tolerated. Among the 33 melanoma patients who were evaluable for tumour response, we observed 2 partial responses, 2 mixed responses and 1 stabilisation. Time to progression in these 5 patients varied from 4 to 29 months. In addition, a partial response lasting 10 months was observed in 1 of the 3 metastatic bladder cancer patients included. None of the tumour responses described above involved visceral metastases. Immunological responses to the vaccine will be reported separately.


Assuntos
Adjuvantes Imunológicos/administração & dosagem , Antígenos de Neoplasias/administração & dosagem , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Proteínas de Neoplasias/administração & dosagem , Neoplasias/terapia , Adulto , Idoso , Vacinas Anticâncer/administração & dosagem , Carcinoma Pulmonar de Células não Pequenas/terapia , Carcinoma de Células de Transição/terapia , Feminino , Humanos , Imunização , Lipídeo A/administração & dosagem , Lipídeo A/análogos & derivados , Neoplasias Pulmonares/terapia , Masculino , Melanoma/terapia , Pessoa de Meia-Idade , Metástase Neoplásica , Neoplasias/patologia , Proteínas Recombinantes/administração & dosagem , Saponinas/administração & dosagem , Neoplasias Cutâneas/terapia , Análise de Sobrevida , Resultado do Tratamento , Neoplasias da Bexiga Urinária/terapia
20.
J Immunol Methods ; 210(2): 167-74, 1997 Dec 29.
Artigo em Inglês | MEDLINE | ID: mdl-9520299

RESUMO

ELISPOT assays for detection of antigen specific HLA class I restricted T lymphocytes have recently been developed. Reliable quantitation of T cell frequencies is crucial for the monitoring of specific cancer vaccines. We have evaluated the accuracy of quantitative results obtained with the IFN-gamma ELISPOT assay and both sensitivity and specificity obtained with several pairs of antibodies was compared. The detection system was tested with IFN-gamma coupled latex beads and the quantitation of influenza specific T cells with several sets of dilution experiments. The reproducibility of the quantitative results was established. Only one pair of monoclonal antibodies had an acceptable specificity. In a serial dilution, almost 100% of IFN-gamma-coated beads could be detected. Furthermore, the number of influenza-peptide specific spots correlated closely with (a) the number of antigen specific T cells derived from an influenza-peptide specific T cell line diluted in PBMC, and (b) the number of CD8+ T cells diluted in autologous CD8-depleted PBMC. In three healthy individuals and three cohorts of healthy volunteers, the number of influenza-peptide specific spots was highly reproducible. The data presented here demonstrate that the frequency of peptide specific CD8+ T cells can be reliably determined from peripheral blood with the IFN-gamma ELISPOT assay.


Assuntos
Ensaio de Imunoadsorção Enzimática/métodos , Interferon gama/metabolismo , Linfócitos T/imunologia , Linhagem Celular , Humanos , Interferon gama/análise , Orthomyxoviridae/imunologia , Reprodutibilidade dos Testes , Sensibilidade e Especificidade
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA