RESUMO
In all, 78 peripheral hematopoietic progenitor cell collections from 52 patients were evaluated using our previously published validated post-thaw assays at the time of collection and following transplantation by assessment of viable CD34(+) cells, and granulocyte-macrophage colony-forming units (CFU-GM) cryopreserved in quality control vials. The median (range) post-thaw recovery of viable CD34(+) cells and CFU-GM was 66.4% (36.1-93.6%) and 63.0% (28.6-85.7%), respectively, which did not show significant correlation with the engraftment of either neutrophils (P=0.136 and 0.417, respectively) or platelets (P=0.88 and 0.126, respectively). However, the reinfused viable CD34(+) cells/kg of patient weight pre- or post-cryopreservation showed significant correlation to engraftment of neutrophils (P=0.0001 and 0.001, respectively) and platelets (P=0.023 and 0.010, respectively), whereas CFU-GM pre- or post-cryopreservation was significantly correlated to neutrophils (P=0.011 and 0.007, respectively) but not to platelets (P=0.112 and 0.100, respectively). The results show that post-cryopreservation assessment of viable CD34(+) cells or CFU-GM is as reliable a predictor of rapid engraftment as that of pre-cryopreservation measures. Therefore, the post-cryopreservation number of viable CD34(+) cells or CFU-GM should be used to eliminate the risks of unforeseen cell loss that could occur during cryopreservation or long-term storage.
Assuntos
Antígenos CD34 , Criopreservação , Sobrevivência de Enxerto , Células Precursoras de Granulócitos , Transplante de Células-Tronco de Sangue Periférico , Adulto , Idoso , Antígenos CD34/sangue , Sobrevivência Celular , Criopreservação/métodos , Feminino , Células Precursoras de Granulócitos/citologia , Humanos , Masculino , Pessoa de Meia-Idade , Transplante AutólogoRESUMO
PURPOSE: To evaluate a policy of immunosuppression with antithymocyte globulin (ATG) as primary therapy for adults with severe aplastic anemia (SAA) regardless of the availability of an HLA-identical bone marrow donor. PATIENTS AND METHODS: Thirty-one consecutive adults with SAA who satisfied the age criteria for allogeneic bone marrow transplantation (BMT) (age less than 51 years) were treated with ATG 20 mg/kg/day for 10 days along with high-dose corticosteroids. Patients with an HLA-identical donor received a transplant if they did not respond to ATG or if they developed life-threatening complications during or soon after ATG administration. Eight patients with no response to ATG were also treated with oral cyclosporine 12.5 mg/kg/day. RESULTS: Eleven patients had a complete and five a partial response to ATG; two patients improved with cyclosporine treatment, resulting in an overall response rate of 58% to immunosuppression. Nine of 14 patients with donors received a BMT: seven because they did not respond to ATG and two because of serious infections. Seven grafts were obtained from related and two from unrelated donors. There was no significant difference in survival between those with and without a related HLA-identical donor (log-rank p value = 0.969). At a median follow-up of 58 months, 26 of 31 are alive with an actuarial survival of 80% at 5 years. Two patients died of infection, two died from complications of BMT, and one remains transfusion-dependent. One patient died of refractory leukemia at 30 months; one patient relapsed with hypoplasia 95 months after initial therapy with ATG. He showed a complete response to treatment with cyclosporine. No other late hematologic events have occurred. CONCLUSIONS: This treatment approach resulted in the restoration of hematopoiesis and independence from transfusion in 80% of patients with SAA entered into the study. The efficacy of allogeneic BMT in salvaging cases in which ATG failed does not appear to be compromised. Follow-up for the development of clonal hematologic disorders remains an important part of this treatment policy.
Assuntos
Anemia Aplástica/terapia , Soro Antilinfocitário/uso terapêutico , Terapia de Imunossupressão/normas , Linfócitos T , Adolescente , Corticosteroides/administração & dosagem , Corticosteroides/uso terapêutico , Adulto , Anemia Aplástica/sangue , Anemia Aplástica/mortalidade , Soro Antilinfocitário/administração & dosagem , Soro Antilinfocitário/fisiologia , Transfusão de Sangue/normas , Transplante de Medula Óssea/efeitos adversos , Transplante de Medula Óssea/normas , Institutos de Câncer , Protocolos Clínicos/normas , Terapia Combinada , Ciclosporina/administração & dosagem , Ciclosporina/uso terapêutico , Feminino , Seguimentos , Hematopoese/efeitos dos fármacos , Hemoglobinas/análise , Teste de Histocompatibilidade , Humanos , Terapia de Imunossupressão/métodos , Contagem de Leucócitos , Pessoa de Meia-Idade , Ontário/epidemiologia , Prognóstico , Terapia de Salvação/efeitos adversos , Terapia de Salvação/normas , Índice de Gravidade de Doença , Taxa de Sobrevida , Linfócitos T/imunologia , Resultado do TratamentoRESUMO
The authors report an unusual case of peripheral T-cell lymphoma in a 16-year-old boy who presented initially with jaundice, splenomegaly, anemia, and thrombocytopenia. A lymphoma was found subsequently in the spleen, which was infiltrated extensively in the red pulp by medium-sized, blastic-appearing lymphoma cells. Immunologic characterization of these cells revealed positivity for CD3, CD5, CD45RO, CD56, and T-cell intracellular antigen (TIA), and negativity for CD2, CD3, CD4, CD8, CD57, CD34, and terminal deoxynucleotidyl transferase (TdT). Conventional cytogenetic studies revealed the presence of isochromosome 7q. On follow up, this patient deteriorated rapidly, with evidence of liver and bone marrow involvement. Although the overall clinical and pathologic features of this disease were characteristic of hepatosplenic gammadelta T-cell lymphoma, the T-cell receptor of this tumor showed an immunophenotype of alphabeta not gammadelta lineage. Using the Southern blot technique, the authors demonstrated monoclonal gene rearrangement of the T-cell receptor beta-chain. Thus, they confirmed the existence of hepatosplenic alphabeta T-cell lymphoma. In view of its overall similarity to hepatosplenic gammadelta T-cell lymphoma, this unusual entity probably represents a slight biologic variation of the same disease.
Assuntos
Anemia Hemolítica/etiologia , Neoplasias Hepáticas/complicações , Linfoma de Células T/complicações , Neoplasias Esplênicas/complicações , Trombocitopenia/etiologia , Adolescente , Humanos , Neoplasias Hepáticas/patologia , Linfoma de Células T/patologia , Masculino , Neoplasias Esplênicas/patologiaRESUMO
Myasthenia gravis (MG) is a rare complication of allogeneic bone marrow transplantation (BMT). We present the 11th case in the medical literature, a 23-year-old female 100 months post-allogeneic bone marrow transplantation for acute myelogenous leukemia (AML). After discontinuation of immunosuppression for chronic graft-versus-host disease (GVHD) involving skin, gastrointestinal tract and lacrimal glands, the patient developed severe, progressive dysphagia initially attributed to esophageal candidiasis. With the development of muscle weakness, ptosis, and dysphonia the diagnosis of generalized myasthenia gravis was suspected, and confirmed by elevated anti-acetylcholine receptor antibody titer and a positive edrophonium challenge. Prednisone and pyridostigmine produced improvement, and thymectomy was performed without pathologic evidence of thymoma. Recurrent post-operative respiratory distress required transient mechanical ventilation. Twenty-seven months after diagnosis, the patient requires maintenance prednisone to control symptoms of myasthenia gravis. The clinical features of all reported cases of MG post-allogeneic BMT are reviewed, and universal features include an association with decreasing immunosuppression, the presence of other manifestations of chronic GVHD, anti-acetylcholine receptor antibodies, and the absence of an associated thymoma. HLA Cw1, Cw7 and DR2 were identified at frequencies significantly above that expected from HLA antigen prevalance studies, and may be markers for increased risk of developing MG post-allogeneic BMT. No statistically significant associations with HLA A2, B7, B35 or donor-recipient sex mismatch were present. Reinstitution of immunosuppression and standard therapies for myasthenia gravis were effective in the majority of cases. The role of thymectomy in this population remains unclear.
Assuntos
Transplante de Medula Óssea/efeitos adversos , Leucemia Mieloide Aguda/terapia , Miastenia Gravis , Adolescente , Adulto , Criança , Feminino , Humanos , Masculino , Miastenia Gravis/etiologia , Miastenia Gravis/fisiopatologia , Miastenia Gravis/terapiaRESUMO
There is increasing interest in blood cell transplants (BCT) from normal donors as an alternative to BMT. Ten patients with relapsed or persistent leukemia after BMT received intensive cytotoxic conditioning followed by allogeneic BCT. Three BCT were from single-antigen mismatched donors; two of the corresponding recipients had rejected a BMT from the same donor. Two patients received BCT from a different donor (one matched, one single-antigen mismatched). The other six BCT were from the same, fully matched, bone marrow donors. Donors were given G-CSF to mobilize progenitor cells which were collected by a single 2-4 h leukapheresis. Methotrexate, CsA and folinic acid were used for GVHD prophylaxis for all transplants but CsA was discontinued sooner after BCT than after BMT. One patient died without engraftment having rejected a BMT from the same single-antigen mismatched donor 4 years previously. Nine patients had granulocyte recovery at a median of 14 days, up to 6 days faster than with their previous BMT. Platelet recovery was also 2-6 days faster than with BMT in four previously engrafting patients. Four patients died without platelet recovery after BCT within a year of BMT, three of treatment-related toxicity and one of relapse. Two patients developed grade II acute GVHD. Of six patients given BCT more than a year from BMT, four, all with acute leukemia, survive 7, 14, 29 and 29 months after BCT and one relapsed at 7 months. All four survivors developed chronic GVHD. These results indicate that BCT may be useful therapy for relapse occurring more than a year after BMT.
Assuntos
Transplante de Células-Tronco Hematopoéticas , Leucemia/terapia , Adolescente , Adulto , Feminino , Doença Enxerto-Hospedeiro/etiologia , Humanos , Masculino , Pessoa de Meia-Idade , Transplante HomólogoRESUMO
Twenty-six patients with haematological malignancy received cryopreserved but otherwise unmanipulated blood cell transplants (BCT) from five- or six-antigen matched siblings in whom progenitor cells had been mobilized by G-CSF. Outcomes were compared with a historical control group of 26 BMT patients matched for age and disease status. Granulocyte counts recovered to 0.5 x 10(9)/l in a median of 16 days after BCT compared with 21.5 days after BMT (P = 0.0002). Platelet counts, unsupported for 3 days, reached 20 x 10(9)/l in a median of 14 days vs 20.5 days (P = 0.0003) after BCT compared with BMT in those patients who engrafted. In the BCT and BMT groups, respectively, the risk of grade II-IV acute GVHD was 37 vs 21% (P = 0.16) and of chronic GVHD at 1 year 53 vs 48% (P = 0.9). There was no significant difference in red cell transfusions but BCT patients required fewer platelet transfusions (median 3 vs 5, P = 0.015) and fewer days in hospital (20.5 vs 25, P = 0.02). These results indicate that allogeneic BCT from matched and partially mismatched family donors result in faster engraftment than BMT without a significant increase in GVHD. Allogeneic BCT may prove to be a more tolerable procedure than BMT for both donor and recipient and there are indications of improved cost-effectiveness.
Assuntos
Transplante de Medula Óssea , Neoplasias Hematológicas/terapia , Transplante de Células-Tronco Hematopoéticas , Adolescente , Adulto , Contagem de Células Sanguíneas , Transplante de Medula Óssea/efeitos adversos , Criança , Pré-Escolar , Família , Feminino , Sobrevivência de Enxerto , Doença Enxerto-Hospedeiro/etiologia , Neoplasias Hematológicas/sangue , Transplante de Células-Tronco Hematopoéticas/efeitos adversos , Humanos , Lactente , Leucaférese , Doadores Vivos , Masculino , Pessoa de Meia-Idade , Transplante HomólogoRESUMO
Eleven patients with high-risk hematologic malignancy received cryopreserved but otherwise unmanipulated blood cell transplants (BCT) from partially mismatched family members in whom progenitor cells had been mobilized by G-CSF. Donors were mismatched by up to one antigen in the GVH direction and up to three antigens in the rejection direction. Outcomes were compared with those of 22 patients receiving BCT from fully matched donors. Two mismatched patients died without engraftment on day 21 and 32. One had rejected bone marrow from the same donor, the other was mismatched by two antigens in the rejection direction and received the lowest dose of CD34+ cells. Median time to granulocyte engraftment was 21.5 (range 16-33) days for the mismatched group compared with 16 (11-28) days for the matched group (P = 0.01). No correlation was found between CD34+ cell dose and time to granulocyte or platelet recovery. In the mismatched and matched BCT groups respectively, the risk of grade II-IV acute graft-versus-host disease (GVHD) was 73% vs 28% (P = 0.001) and of chronic GVHD 100% vs 78% at 18 months (P = 0.01). The relationship of T cell dose to acute GVHD could only be evaluated in the matched group and no correlation was found. One of 11 mismatched patients and eight of 22 matched patients had relapse or persistent disease. Disease-free survival at 1 year was similar at 55% for mismatched and 50% for matched BCT. These results indicate that allogeneic BCT from partially mismatched family members is accompanied by a high incidence of GVHD but may result in comparable survival to BCT from fully matched donors.
Assuntos
Neoplasias Hematológicas/terapia , Transplante de Células-Tronco Hematopoéticas , Adolescente , Adulto , Tipagem e Reações Cruzadas Sanguíneas , Criança , Pré-Escolar , Feminino , Sobrevivência de Enxerto , Humanos , Masculino , Pessoa de Meia-Idade , Transplante Homólogo , Resultado do TratamentoRESUMO
Fifty-seven patients receiving unrelated donor (UD) BMT were matched for disease and stage with 57 recipients of genotypically matched related donor (MRD) BMT. All UD recipients were matched serologically for A and B and by high resolution for DR and DQ antigens. All patients received CsA and 'short course' methotrexate with folinic acid. Unrelated donor BMT patients also received thymoglobulin 4.5 mg/kg (6 mg/kg if <30 kg) in divided doses over 3 days pretransplant. For UD and RD BMT, respectively, incidence of acute GVHD grade II-IV was 19 +/- 6% vs 36 +/- 8%, grade III-IV 10 +/- 6% vs 18 +/- 7%, chronic GVHD 44 +/- 8% vs 51 +/- 8%, non-relapse mortality 15 +/- 5% vs 8 +/- 4% at 100 days, 28 +/- 8% vs 36 +/- 7% at 3 years. At 3 years, relapse was 45 +/- 7% vs 42 +/- 7%, and disease-free survival 39 +/- 7% vs 37 +/- 7%. None of these differences are significant. Three-year overall survival was identical at 42 +/- 7%. For 29 patients with low/intermediate risk leukemia, disease-free survival was 68 +/- 10% after UD BMT vs 59 +/- 9% for RD BMT recipients (P = NS). Corresponding figures for high risk patients were 14 +/- 7% and 21 +/- 8%, respectively. We conclude that UD BMT recipients matched as above and given pretransplant ATG have similar outcomes to recipients of MRD BMT using conventional drug prophylaxis. Unrelated donor BMT should be considered in any circumstance where MRD BMT is routine.
Assuntos
Soro Antilinfocitário/administração & dosagem , Transplante de Medula Óssea/métodos , Transplante de Medula Óssea/imunologia , Transplante de Medula Óssea/mortalidade , Intervalo Livre de Doença , Feminino , Genótipo , Doença Enxerto-Hospedeiro/prevenção & controle , Teste de Histocompatibilidade/métodos , Humanos , Masculino , Análise por Pareamento , Prognóstico , Recidiva , Taxa de Sobrevida , Doadores de Tecidos , Transplante Homólogo , Transplante Isogênico , Resultado do TratamentoRESUMO
We have compared the outcomes of 87 patients with acute myelogenous leukemia (AML) and myelodysplasia (MDS) receiving matched sibling transplants with stem cells from peripheral blood (blood cell transplant, BCT) or bone marrow (BMT). In good risk patients (AML in CR1) granulocytes recovered to 0.5 x 10(9)/l a median of 14 days after BCT compared with 19 days after BMT (P < 0.0001). For patients with poor risk disease (AML beyond CR1 and MDS) corresponding figures were 16 vs 26 days (P < 0.0001). Platelet recovery to 20 x 10(9)/l was also faster after BCT (good risk 12 vs 20 days, P < 0.0001; poor risk 17 vs 22 days, P = 0.04). Red cell transfusions were unaffected by cell source, but BCT recipients required less platelet transfusions (good risk 1 vs 5, P = 0.002; poor risk 5 vs 11, P = 0.004). Blood cell transplants resulted in more chronic GVHD (86% vs 48%, P = 0.005) and a significantly higher proportion of recipients with KPS of 80% or less (48% vs 5%, P = 0.004). Disease-free survival at 4 years was 23% for both groups of poor risk patients but outcome in good risk patients was better after BCT (93% vs 62%, P = 0.047) related mainly to less relapse. While disease-free survival may be better after BCT than BMT for AML in CR1, quality of life may be relatively impaired.
Assuntos
Transplante de Medula Óssea/métodos , Transplante de Células-Tronco Hematopoéticas/métodos , Leucemia Mieloide Aguda/terapia , Síndromes Mielodisplásicas/terapia , Adolescente , Adulto , Transfusão de Componentes Sanguíneos , Doadores de Sangue , Criança , Pré-Escolar , Sobrevivência de Enxerto , Doença Enxerto-Hospedeiro , Fator Estimulador de Colônias de Granulócitos/uso terapêutico , Humanos , Pessoa de Meia-Idade , Qualidade de Vida , Recidiva , Relações entre Irmãos , Taxa de Sobrevida , Transplante HomólogoRESUMO
Nucleoside analogs are important components of treatment regimens for acute leukemia in adults. Plasma membrane permeation of the nucleoside analog molecules, the initial event in the cellular conversion of nucleosides to active agents, is mediated by nucleoside-specific membrane transporters. The widely-expressed es nucleoside transporter accepts as substrates diverse nucleoside analogs, including cytarabine (araC), 2-chlorodeoxyadenosine, and fludarabine. The cellular content of es transporter sites has been measured in blasts from patients with acute lymphoblastic leukemia and acute myelogenous leukemia, by a sensitive, quantitative flow cytometry assay that employs the tightly-bound es ligand, SAENTA fluorescein. Values for es transporter expression varied ten-fold among samples from patients with acute myelogenous leukemia. In this article, we review current findings that document, in confocal fluorescence microscopy images and in flow cytometry assays of SAENTA fluorescein-stained cells, the patient-to-patient variance of es transporter expression in leukemic blasts from patients. Our data show a correlation between the expression of es transporters and the in vitro sensitivity to nucleoside drugs of blasts from acute leukemia patients. These findings show that the flow cytometry assay of es expression provides a facile means of predicting resistance of leukemia cells to the cytotoxicity of araC and other nucleosides.
Assuntos
Proteínas de Transporte/biossíntese , Citarabina/farmacocinética , Leucemia Mieloide Aguda/metabolismo , Proteínas de Membrana/biossíntese , Leucemia-Linfoma Linfoblástico de Células Precursoras/metabolismo , Doença Aguda , Antimetabólitos Antineoplásicos/farmacocinética , Proteínas de Transporte/antagonistas & inibidores , Resistencia a Medicamentos Antineoplásicos , Citometria de Fluxo , Fluoresceínas/metabolismo , Expressão Gênica , Humanos , Leucemia Mieloide Aguda/tratamento farmacológico , Linfócitos/metabolismo , Proteínas de Membrana/antagonistas & inibidores , Microscopia Confocal , Proteínas de Transporte de Nucleosídeos , Leucemia-Linfoma Linfoblástico de Células Precursoras/tratamento farmacológico , Nucleosídeos de Purina/metabolismoRESUMO
Non-myeloablative (MA) and reduced intensity allo-SCT regimens are offered to older patients and/or those with comorbidities because the morbidity and mortality attributable to fully MA conditioning is thought to be unacceptably high. A total of 207 patients aged 50-66 years were treated between 1999 and 2008 with SCT after MA conditioning with fludarabine 50 mg/m(2) daily × 5 and i.v. BU 3.2 mg/kg daily × 4.90 (43%) had additional TBI 200 cGy × 2. GVHD prophylaxis was CsA, MTX and thymoglobulin (4.5 mg/kg total dose). As defined by the hematopoietic cell transplantation co-morbidity index (HCT-CI) scoring system 117 (57%) pts scored 0 and 90 (43%) 1. At 5 years OS was 39 vs 54% (P=0.008), disease-free survival 38 vs 49% (P=0.03), TRM 39 vs 19% (P=0.003) and relapse 36 vs 39% (P=ns) in those with scores of 0 and 1, respectively. Multivariate analysis confirmed the influence of HCT-CI scores on TRM (subhazard ratios=2.29; 95% confidence interval=1.29-4.08; P=0.005). We conclude that comorbidities as assessed by the HCT-CI do influence TRM with this regimen but that age alone should not be an indication to prefer a less intense protocol.
Assuntos
Soro Antilinfocitário/uso terapêutico , Bussulfano/uso terapêutico , Neoplasias Hematológicas/terapia , Transplante de Células-Tronco Hematopoéticas/métodos , Condicionamento Pré-Transplante/métodos , Vidarabina/análogos & derivados , Fatores Etários , Idoso , Comorbidade , Intervalo Livre de Doença , Feminino , Doença Enxerto-Hospedeiro/etiologia , Neoplasias Hematológicas/tratamento farmacológico , Neoplasias Hematológicas/cirurgia , Transplante de Células-Tronco Hematopoéticas/efeitos adversos , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Taxa de Sobrevida , Condicionamento Pré-Transplante/efeitos adversos , Transplante Homólogo , Vidarabina/uso terapêuticoAssuntos
Antineoplásicos/uso terapêutico , Leucemia Linfocítica Crônica de Células B/tratamento farmacológico , Vidarabina/análogos & derivados , Administração Oral , Intervalo Livre de Doença , Humanos , Cadeias Pesadas de Imunoglobulinas/genética , Região Variável de Imunoglobulina/genética , Leucemia Linfocítica Crônica de Células B/genética , Leucemia Linfocítica Crônica de Células B/mortalidade , Mutação , Vidarabina/uso terapêutico , Proteína-Tirosina Quinase ZAP-70/genéticaRESUMO
An Epstein-Barr virus (EBV)-seronegative 31-year-old male underwent cardiac transplantation in 1991 for congenital cardiomyopathy. He presented with a protracted course of waxing and waning lymphadenopathy beginning four years after transplantation with eventual progression to a fulminant EBV-positive large cell lymphoma eight years after transplantation. Risk factors for the development of post-transplant lymphoproliferative disease in this patient, the importance of a standardized approach to pathology in assessing therapeutic options, and the management strategies used are discussed.
Assuntos
Infecções por Vírus Epstein-Barr/complicações , Transplante de Coração/efeitos adversos , Linfoma Difuso de Grandes Células B/patologia , Plasmócitos/patologia , Adulto , Humanos , Hiperplasia , Masculino , RecidivaRESUMO
Some patients with thrombotic thrombocytopenic purpura (TTP) remain plasma-exchange-dependent for prolonged periods of time. This exposes patients to risk, uses substantial resources, and requires prolonged hospitalization. We have splenectomized 7 such patients following 25-42 plasma exchanges while patients were in partial remission only and were clinically stable. In 6 patients, including 1 with TTP secondary to mitomycin C, thrombocytopenia promptly resolved. Relapse has not occurred during 18 or more months of observation. The seventh patient did not respond. We conclude that splenectomy should be considered as an alternative to continued plasma-exchange therapy in such patients.
Assuntos
Troca Plasmática , Púrpura Trombocitopênica Trombótica/terapia , Esplenectomia , Corticosteroides/uso terapêutico , Antineoplásicos/efeitos adversos , Aspirina/uso terapêutico , Terapia Combinada , Transfusão de Eritrócitos , Humanos , Mitomicina/efeitos adversos , Inibidores da Agregação Plaquetária/uso terapêutico , Contagem de Plaquetas , Púrpura Trombocitopênica Trombótica/tratamento farmacológico , Púrpura Trombocitopênica Trombótica/cirurgia , Indução de Remissão , Resultado do TratamentoRESUMO
Cytarabine (araC) is converted to araC 5'-triphosphate after entering leukemia cells as a substrate for nucleoside transport processes. This study tested the relationship between araC cytotoxicity, measured in an in vitro tetrazolium dye reduction assay of cell viability, and the cellular abundance of es nucleoside transport elements, assayed by a flow cytometric method that used the es-specific stain, 5-(SAENTA-x8)-fluorescein (5-(Sx8)-F), in cultured leukemia cells and in myeloblasts and lymphoblasts (blasts) from leukemia patients. Cellular es site abundance (B(max) value for 5-(Sx8)-F binding) varied sixfold among nine leukemic myeloblast samples from patients. In cultured OCI/AML-2 myeloblasts and CCRF-CEM T-lymphoblasts, and in fresh leukemic blasts, es sites were fractionally blocked by treatment with graded concentrations of nitrobenzylthioinosine (NBMPR), an inhibitory es site ligand, to simulate the variation in es expression found in leukemic blasts from patients with acute myeloid leukemia. When the cytotoxicity of a single concentration of araC was determined in NBMPR-treated leukemia cells, cell kill correlated closely with the intensity of 5-(Sx8)-F fluorescence (r = .92 to .99), a measure of the cell surface abundance of functional es nucleoside transporter sites. Concentrations of NBMPR that achieved half-maximal reduction (4.3 to 12 nmol/L) of cellular 5-(Sx8)-F fluorescence (measured by flow cytometry) approximated IC50 values (1 to 10 nmol/L) previously found for inhibition by NBMPR of es-mediated nucleoside fluxes in several cell types, supporting the view that 5-(Sx8)-F interacted with the estransporter. The correlation of araC cytotoxicity and the B(max) for 5-(Sx8)-F binding to es sites in cultured leukemia cells and in leukemic blasts from acute leukemia patients (r = .95) suggests that the flow cytometry assay of es capacity may be useful in predicting clinical response to araC.
Assuntos
Antimetabólitos Antineoplásicos/toxicidade , Proteínas de Transporte/metabolismo , Citarabina/toxicidade , Leucemia/metabolismo , Nucleosídeos/metabolismo , Doença Aguda , Adenosina/análogos & derivados , Marcadores de Afinidade , Morte Celular/efeitos dos fármacos , Citometria de Fluxo , Fluoresceína , Fluoresceínas , Humanos , Leucemia/tratamento farmacológico , Leucemia/patologia , Tionucleosídeos , Células Tumorais CultivadasRESUMO
The hepatic morphological findings in 3 patients treated with amiodarone, a potent and effective antiarrhythmic drug, are reported. An enlarged liver and mild elevation of hepatic enzymes were the most important clinical findings. Fibrosis, cholangitis, mixed inflammatory infiltrate, and cytoplasmic granularity of the hepatocytes were the main histologic changes common to all cases. In 2 of the cases the presence of Mallory bodies was confirmed by electron microscopy. In 1 of these 2 cases, Mallory bodies were also confirmed by immunostaining. Ultrastructurally, numerous cytoplasmic inclusions with a membranous or lamellar structure identical to those described in phospholipidosis were the most striking features seen in hepatocytes, biliary epithelial cells, Kupffer cells, and endothelial cells.
Assuntos
Amiodarona/efeitos adversos , Benzofuranos/efeitos adversos , Hepatopatias/patologia , Fígado/ultraestrutura , Biópsia , Doença Hepática Induzida por Substâncias e Drogas , Colangite/induzido quimicamente , Colangite/patologia , Feminino , Humanos , Hepatopatias/imunologia , Masculino , Pessoa de Meia-Idade , Fosfolipídeos/metabolismoRESUMO
We compared the expression of matrix metalloproteinases (MMP-2 and MMP-9) and tissue inhibitors of metalloproteinases (TIMP-1 and TIMP-2) in bone marrow acute myelogenous leukaemia (AML) blasts and leukaemic cell lines (HEL, HL-60, K-562 and KG-1) with their expression in normal bone marrow cells. All AML samples and leukaemic cell lines tested expressed MMP-9 and/or MMP-2 mRNA and, accordingly, these gelatinases were secreted into media. Moreover, TIMP-1 and TIMP-2 mRNA and secreted proteins were demonstrated in all the AML samples. Although all the leukaemic cell lines expressed TIMP-1, the HL-60 cells also expressed TIMP-2. In contrast, normal steady-state bone marrow immature progenitor cells (CD34+ cells) did not express or secrete either MMP-2 or MMP-9, but more mature mononuclear cells from normal bone marrow expressed and secreted MMP-9. Also, normal bone marrow CD34+ cells and mononuclear cells expressed TIMP-1 and TIMP-2 mRNA, but these proteins were not detectable by reverse zymography. Furthermore, whereas bone marrow fibroblasts and endothelial cells secreted only latent MMP-2, the activated form of this enzyme was found in media conditioned by cells obtained from long-term cultures of normal and AML bone marrow adherent layers. Our finding of up-regulated production of gelatinases, TIMP-1 and TIMP-2 by leukaemic cells suggests that these proteins may be implicated in the invasive phenotype of AML.
Assuntos
Células da Medula Óssea/metabolismo , Colagenases/metabolismo , Gelatinases/metabolismo , Leucemia Mieloide Aguda/metabolismo , Metaloendopeptidases/metabolismo , Inibidor Tecidual de Metaloproteinase-1/metabolismo , Inibidor Tecidual de Metaloproteinase-2/metabolismo , Adolescente , Adulto , Idoso , Feminino , Células-Tronco Hematopoéticas/metabolismo , Humanos , Masculino , Metaloproteinase 2 da Matriz , Metaloproteinase 9 da Matriz , Pessoa de Meia-Idade , Reação em Cadeia da Polimerase Via Transcriptase Reversa/métodos , Células Tumorais CultivadasRESUMO
Between June 1, 1976 and Apr. 30, 1981, 157 patients were treated for inoperable cancer of the liver by intermittent percutaneous infusion of chemotherapeutic agents into the hepatic artery. The majority of these patients had metastatic colorectal cancer. The regimen of chemotherapeutic infusion evolved during the study and is described. The survival of the total group of patients is analysed according to type of cancer, extent of disease, dosage and combination of drugs. This therapeutic modality appears to benefit patients with metastases from colorectal cancer confined to the liver. The complication rate for this procedure is relatively low. The results from this study suggest that intermittent percutaneous infusion of cytotoxic agents into the hepatic artery is worthwhile for selected patients and should be studied further in combination with other forms of therapy.