Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 458
Filtrar
1.
AIDS Behav ; 19(5): 821-31, 2015 May.
Artículo en Inglés | MEDLINE | ID: mdl-25432878

RESUMEN

The use of antiretroviral therapy to prevent HIV transmission is now advocated in many settings, yet little research has documented the views of people with HIV. Semi-structured interviews were conducted in Australia between 2012 and 2014 with 27 HIV-positive people not using treatment at the time of interview. Thematic analysis of views on treatment-as-prevention found that while many participants recognised potential prevention benefits, only a minority was in support of initiating treatment solely to achieve those benefits. A range of uncertain or critical views were expressed regarding who would benefit, risk reduction, and changing treatment norms. Participants resisted responsibility narratives that implied treatment should be used for the public good, in favour of making considered decisions about their preferred approach to managing HIV. Engaging communities in dialogue and debate regarding the risks and benefits of treatment will be critical if this new prevention strategy is to engender public trust.


Asunto(s)
Fármacos Anti-VIH/uso terapéutico , Terapia Antirretroviral Altamente Activa , Infecciones por VIH/prevención & control , Conducta de Reducción del Riesgo , Adulto , Anciano , Australia , Femenino , Humanos , Entrevistas como Asunto , Masculino , Persona de Mediana Edad , Análisis Multivariante , Embarazo , Investigación Cualitativa , Análisis de Regresión
2.
Curr Mol Med ; 13(6): 1010-22, 2013 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-23590815

RESUMEN

Human Bone Marrow Mesenchymal Stem cells (hMSC) are a promising candidate for cytotherapy. However, the therapeutic potential is limited since the therapy requires ex-vivo cell culturing in which deterioration in cellular viability and aging is observed with time.Telomerase ribonucleoprotein complex re-elongates telomeres and therefore promotes genomic integrity, proliferation and lifespan. Recently we showed that increasing telomerase reverse transcriptase (TERT) expression by novel compound confers resistance from apoptosis induced by oxidative stress. Here we investigated the possibility that a controlled induction of human TERT (hTERT) levels by chemical compounds (AGS-499 and AGS-500) might improve the functionality of hMSC derived from healthy and neurodegenerative diseased individuals. We demonstrate that AGS treatments of hMSC increased telomerase activity and hTERT levels in a time and dose dependent manner. Prolonged treatments with the compounds increased the average telomeres length, without altering population doublings (PD) or inducing chromosomal aberrations. AGS treatments of hMSC protected the cells from apoptosis and DNA damages induced by H2O2, and from the toxicity induced by long term exposure to DMSO. These AGS effects were shown to be mediated by telomerase since they were not observed when TERT was depleted from hMSC or in mouse embryonic stem cells derived from TERT knockout mice. Furthermore, AGS compounds did not alter the functionality of hMSC as examined by their ability to differentiate into various lineages in the presence of the compounds. These results suggest that pharmaceutical increase of telomerase may confer a beneficial therapeutic advantage in regenerative medicine when hMSC therapy is applied.


Asunto(s)
Citoprotección/efectos de los fármacos , Activadores de Enzimas/farmacología , Salud , Células Madre Mesenquimatosas/citología , Células Madre Mesenquimatosas/enzimología , Estrés Oxidativo/efectos de los fármacos , Telomerasa/metabolismo , Adulto , Anciano , Animales , Muerte Celular/efectos de los fármacos , Diferenciación Celular/efectos de los fármacos , Linaje de la Célula/efectos de los fármacos , Proliferación Celular/efectos de los fármacos , Supervivencia Celular/efectos de los fármacos , Niño , Aberraciones Cromosómicas , Daño del ADN , Activadores de Enzimas/química , Femenino , Humanos , Peróxido de Hidrógeno/toxicidad , Masculino , Células Madre Mesenquimatosas/efectos de los fármacos , Ratones , Persona de Mediana Edad , Fenoles/química , Fenoles/farmacología , Sustancias Protectoras/farmacología , Telomerasa/genética , Homeostasis del Telómero/efectos de los fármacos , Compuestos de Tritilo/química , Compuestos de Tritilo/farmacología
3.
Bone Marrow Transplant ; 47(11): 1455-8, 2012 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-22465977

RESUMEN

Desmoplastic small round cell tumor of the peritoneum (DSRCTP) is a rare, frequently fatal tumor. This retrospective study, based on CIBMTR registry data, describes the largest reported cohort of DSRCTP patients who have undergone Auto-SCT. The probabilities of disease-free survival (DFS) at 1 year for patients in CR and not in CR were 75% (95% confidence interval: 48-94%) and 35% (15-59%), respectively. The probability of OS at 3 years was 57% (29-83%) and 28% (9-51%) for patients in CR and not in CR, respectively. Median survival for the entire cohort was 31 months (36 months and 21 months for those in CR and not in CR, respectively). Engraftment at 42 days was 97% (88-100%). Treatment-related mortality was low, with only one death in the first 100 days. Auto-SCT is a tolerable approach in patients with DSRCTP, with the greatest benefit seen in those patients who obtain CR. For those not in CR, the median OS in this series is greater than previously reported (21 months vs 17 months), suggesting Auto-SCT is useful in prolonging DFS and OS, even in patients with residual or persistent disease pre-transplant.


Asunto(s)
Tumor Desmoplásico de Células Pequeñas Redondas/cirugía , Trasplante de Células Madre Hematopoyéticas/métodos , Neoplasias Peritoneales/cirugía , Adolescente , Adulto , Niño , Estudios de Cohortes , Tumor Desmoplásico de Células Pequeñas Redondas/patología , Supervivencia sin Enfermedad , Femenino , Trasplante de Células Madre Hematopoyéticas/efectos adversos , Humanos , Masculino , Neoplasias Peritoneales/patología , Estudios Retrospectivos , Resultado del Tratamiento , Adulto Joven
4.
Bone Marrow Transplant ; 47(6): 838-45, 2012 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-22020024

RESUMEN

Selective elimination of alloreactive cells was carried out in the set-up of T-cell-mediated immunotherapy in an effort to gain the benefits of hematopoietic allogeneic transplantation while reducing the risk of GVHD. Low MW chemical compounds were screened for their effect on T-cell-mediated immune responses of murine- and human-derived lymphocytes. Selected compounds were further tested in secondary MLR assays in which sensitization to alloantigens was carried out in vitro, in the presence or absence of a given compound, followed by exposure to related and unrelated alloantigens or T-cell mitogenic stimulation. At a low concentration of <1 µM, a quinazoline derivative named AO#349 [2-(3,4,5-trimethoxyphenyl)-N-p-tolylquinazolin-4-amine], was able to induce 78-90% inhibition of a selective allogeneic response while retaining >92% immune reactivity to unrelated alloantigens and mitogenic stimuli in vitro. Following allogeneic sensitization in the presence of AO#349, elimination of alloreactivity to the priming alloantigens was also proved in a murine model of GVHD: 10 out of 15 sub-lethally irradiated mice inoculated with these sensitized cells were GVHD-free for >200 days. AO#349 was efficient in induction of a selective elimination of alloreactivity and should be considered for clinical application in allogeneic cell-mediated immunotherapy.


Asunto(s)
Enfermedad Injerto contra Huésped/inmunología , Enfermedad Injerto contra Huésped/prevención & control , Trasplante de Células Madre Hematopoyéticas , Inmunidad Celular , Inmunoterapia , Linfocitos T/inmunología , Animales , Modelos Animales de Enfermedad , Femenino , Humanos , Isoantígenos/inmunología , Ratones , Ratones Endogámicos BALB C , Quinazolinas/farmacología , Trasplante Homólogo
5.
Bone Marrow Transplant ; 45(7): 1189-96, 2010 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-19946341

RESUMEN

The influence of graft composition on the outcome of reduced-intensity (RIC) allogeneic PBSC transplantation (allo-PBSC) remains controversial. In this study, we analyzed the impact of CD34+ cell dose on the incidence of GVHD, and on the outcome after allo-PBSC, in 103 patients with hematological malignancies, using a uniform RIC regimen. The following variables were included in statistical analysis: (1) number of C34+ cells, (2) high-risk vs low-risk disease status, (3) matched related vs matched unrelated donor, (4) female donor to male recipient vs any other combination, (5) age of recipient (above vs below the median). Univariate and multivariate analysis did not reveal any association between CD34+ cell dose and acute grade-2 to grade-4, cGVHD, non-relapse mortality (NRM), relapse rate (RR) and OS. High-risk disease status was the only variable independently associated with increased NRM (P=0.001), increased RR (P=0.012) and decreased OS (P<0.001). The same results were obtained when analysis was restricted to a subgroup of 55 patients with myeloid neoplasms. The influence of graft composition on the outcome of RIC allo-PBSC should be further investigated via well-controlled randomized prospective studies.


Asunto(s)
Antígenos CD34 , Trasplante de Células Madre de Sangre Periférica/métodos , Adolescente , Adulto , Factores de Edad , Anciano , Suero Antilinfocítico/uso terapéutico , Recuento de Células , Femenino , Enfermedad Injerto contra Huésped , Humanos , Incidencia , Masculino , Persona de Mediana Edad , Factores Sexuales , Acondicionamiento Pretrasplante/métodos , Trasplante Homólogo , Resultado del Tratamiento , Adulto Joven
6.
Folia Biol (Praha) ; 55(1): 27-34, 2009.
Artículo en Inglés | MEDLINE | ID: mdl-19445844

RESUMEN

Marrow cavities in all bones of newborn mammals contain haematopoietic tissue and stromal microenvironment that support haematopoiesis (haematopoietic microenvironment), known as red bone marrow (BM). From the early postnatal period onwards, the haematopoietic microenvironment, mainly in tubular bones of the extremities, is replaced by mesenchymal cells that accumulate lipid drops, known as yellow BM, whereas haematopoietic tissue gradually disappears. We analysed the ability of mesenchymal cell progenitors in red and yellow BM to produce bone and haematopoietic microenvironment in vivo after transplantation into normal or haematopoietically deficient (irradiated and old) recipients. We found that (1) normal substitution of red with yellow BM results from a gradual loss of mesenchymal stem cells (MSCs) capable of developing bone and haematopoietic microenvironment; (2) the mesenchymal cell population in tubular bones still containing active haematopoietic tissue gradually becomes depleted of MSCs, starting from a young age; (3) haematopoietic microenvironment is incapable of self-maintenance and its renewal depends on the presence of precursor cells; (4) the mesenchymal cell population remaining in areas with yellow BM contains cells able to develop functionally active haematopoietic microenvironment in conditions of haematopoietic insufficiency. Our data also indicate the possible existence of bi-potential stromal precursor cells producing either bone in normal, or bone together with active haematopoietic microenvironment in irradiated or old recipients. This study opens a spectrum of opportunities for the extension of haematopoietic territories by substituting the fat contents of BM cavities with haematopoietic tissue, thereby improving haematopoiesis compromised by cytotoxic treatments, irradiation, ageing, etc.


Asunto(s)
Células de la Médula Ósea/citología , Médula Ósea/metabolismo , Células Madre Mesenquimatosas/citología , Células Madre Mesenquimatosas/fisiología , Animales , Médula Ósea/fisiología , Células de la Médula Ósea/metabolismo , Células de la Médula Ósea/fisiología , Femenino , Células Madre Hematopoyéticas/citología , Células Madre Hematopoyéticas/metabolismo , Células Madre Hematopoyéticas/fisiología , Masculino , Trasplante de Células Madre Mesenquimatosas , Células Madre Mesenquimatosas/metabolismo , Ratas
7.
Bone Marrow Transplant ; 43(4): 339-43, 2009 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-18850020

RESUMEN

Alefacept (Amevive) is an immunosuppressive dimeric fusion protein that is used for psoriasis control. We recently showed its effect in acute steroid-resistant/dependent GVHD. In this study, we describe the effect of alefacept treatment on chronic extensive GVHD (cGVHD). Twelve patients were included in this study; of these 8 (9 of 13 episodes) showed response. The median time to initial response was 2.25 weeks and the response was marked (n=3), moderate (n=2) or minimal (n=4). In two responding patients, the response was only temporary. Complications that appeared during treatment included infection, pericarditis and squamous cell carcinoma of the lip. All these events may be related to other drugs given simultaneously. With a 30-month median follow-up, 6 of 12 patients are alive, with all but one with stable or improved cGVHD. Six patients died because of GVHD progression, whereas none of the patients experienced relapse of the disease for which the transplantation was done. As reported earlier in psoriatic patients treated with alefacept, we found a consistent increase in the percentage of naive T cells as a consequence of treatment. In conclusion, alefacept is effective for the treatment of cGVHD, and dose and time intervals of treatment should be explored further.


Asunto(s)
Enfermedad Injerto contra Huésped/tratamiento farmacológico , Inmunosupresores/uso terapéutico , Proteínas Recombinantes de Fusión/uso terapéutico , Adolescente , Adulto , Alefacept , Preescolar , Enfermedad Crónica , Estudios de Cohortes , Femenino , Enfermedad Injerto contra Huésped/inmunología , Humanos , Memoria Inmunológica/efectos de los fármacos , Inmunosupresores/efectos adversos , Masculino , Persona de Mediana Edad , Proteínas Recombinantes de Fusión/efectos adversos , Trasplante de Células Madre/efectos adversos , Linfocitos T/efectos de los fármacos , Linfocitos T/inmunología , Adulto Joven
8.
Leuk Res ; 33(4): 525-38, 2009 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-18834631

RESUMEN

The breaking of peripheral T-cell tolerance toward self-antigens expressed by tumor cells and the subsequent establishment of an effective tumor protective immune response remains a major challenge for cancer immunotherapy. We report that both protective and therapeutic anti-tumor immune responses can be achieved in a mouse leukemia/lymphoma tumor model through the strong adjuvant effects provided by allogeneic CD3/CD28 cross-linked Th1 memory cells. The adjuvant effect of these cells is mediated by their ability to produce a variety of 'danger signals' which serve to deviate native non-protective Th2 anti-leukemia immune responses to effective Th1 immune responses.


Asunto(s)
Inmunoterapia Activa/métodos , Leucemia/terapia , Linfoma/terapia , Células TH1/trasplante , Trasplante Homólogo/inmunología , Animales , Antígenos de Neoplasias/inmunología , Antígenos CD28/inmunología , Complejo CD3/inmunología , Vacunas contra el Cáncer/inmunología , Diferenciación Celular/inmunología , Ciclina D1/inmunología , Femenino , Memoria Inmunológica , Leucemia/inmunología , Linfoma/inmunología , Masculino , Ratones , Células TH1/citología , Células TH1/inmunología
9.
Bone Marrow Transplant ; 42(11): 739-42, 2008 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-18724394

RESUMEN

Autologous hematopoietic stem cells (HSCs) harvested as back-up prior to allogeneic hematopoietic SCT (HSCT) may potentially be useful in the treatment of graft failure or in cases with severe GVHD. Here, we studied the general policies and indications for autologous back-up harvest among the European Group for Blood and Marrow Transplantation centers in the year 2003. The outcome of patients receiving autologous back-up transfusion between 1998 and 2002 was evaluated retrospectively. The responses from 94 centers showed that 48 centers had a general policy with variable indications for autologous back-up harvest. Thirty-five patients with graft failure (25), GVHD (8) or relapse (2) retransplanted with autologous back-ups were reported. Autologous back-up transfusion was performed at a median of 35 days (patients with graft failure) or 90 days (patients with GVHD) after allogeneic HSCT. Within 100 days after autologous HSCT, 21 patients died from treatment-related complications (19) or relapse (2). Estimated overall survival at 1 year was 16% (95% CI 0-32%) for patients treated for graft failure and 13% (95% CI 0-37%) for GVHD patients. In conclusion, our data demonstrate that the indication for autologous back-up harvests is limited and that general storage and use cannot be recommended unless in selected prospective studies.


Asunto(s)
Enfermedad Injerto contra Huésped/terapia , Trasplante de Células Madre Hematopoyéticas/métodos , Trasplante Homólogo/métodos , Adolescente , Adulto , Transfusión Sanguínea , Niño , Preescolar , Europa (Continente) , Femenino , Humanos , Masculino , Persona de Mediana Edad , Recurrencia , Factores de Tiempo , Resultado del Tratamiento
10.
Leuk Res ; 32(12): 1903-13, 2008 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-18565579

RESUMEN

Fully allogeneic CD3/CD28 cross-linked Th1 cells were found to elicit host-mediated anti-leukemia effects without GVHD toxicity. Mice inoculated with a lethal dose of BCL1 leukemia demonstrated significantly enhanced survival after allogeneic Th1 treatment. Cure rates of 12.5% with a single allogeneic cell infusion and 31.25% with multiple infusions were demonstrated. Cured mice were able to reject rechallenge with a lethal dose of tumor without further treatment. These results suggest that use of intentionally mis-matched, Th1 memory cells infused with cross-linked CD3/CD28 could represent a novel clinical approach to eliciting potent anti-tumor effects in patients without conditioning and without GVHD toxicity.


Asunto(s)
Enfermedad Injerto contra Huésped/prevención & control , Efecto Injerto vs Leucemia/inmunología , Memoria Inmunológica , Leucemia Linfocítica Crónica de Células B/inmunología , Células TH1/trasplante , Animales , Trasplante de Médula Ósea/efectos adversos , Antígenos CD28/inmunología , Complejo CD3/inmunología , Reactivos de Enlaces Cruzados/farmacología , Modelos Animales de Enfermedad , Femenino , Prueba de Histocompatibilidad , Humanos , Leucemia Linfocítica Crónica de Células B/terapia , Masculino , Ratones , Ratones Endogámicos BALB C , Ratones Endogámicos C57BL , Análisis de Supervivencia , Células TH1/efectos de los fármacos , Trasplante Homólogo
11.
Med Hypotheses ; 70(6): 1186-92, 2008.
Artículo en Inglés | MEDLINE | ID: mdl-18054441

RESUMEN

The anti-tumor immune response that occurs in allogeneic bone marrow/stem cell transplant (BMT) settings is capable of eradicating tumors that are resistant to chemotherapy/radiation treatment. This anti-tumor immune response, known as the graft vs. tumor (GVT) effect, is the most effective immunotherapy treatment ever discovered. Unfortunately, the clinical application of GVT is severely limited due to the intimate association of GVT with the extremely toxic and often lethal side-effect known as graft vs. host disease (GVHD). It is a major research focus in the field of BMT to develop methods to separate the beneficial GVT effect from the detrimental GVHD toxicity. However, due to the intimate association of these effects, attempts to limit GVHD also have a tendency to limit the GVT effect. We propose a new concept for harnessing the power of the GVT effect without the toxicity of GVHD. Rather than trying to separate GVT from GVHD, we propose that these naturally coupled effects can 'mirrored' onto the host immune system and maintain their intimate association. The 'mirror' of GVHD is a host rejection of a graft (HVG). As rejection of an allograft would not be toxic, an HVG effect coupled to a host vs. tumor (HVT) effect, the 'mirror' of the GVT effect, would provide the anti-tumor effect of BMT without GVHD toxicity. In the 'mirror' setting, the HVT effect must occur against syngeneic tumors, while in the BMT setting the GVT effect occurs in the allogeneic setting. Previous attempts to elicit syngeneic anti-tumor immunity using therapeutic tumor vaccines have had disappointing results in the clinic due to the influence of tumor immunoavoidance mechanisms. We propose that the 'danger' signals that are released as a result of GVHD in the allogeneic BMT setting serve as an adjuvant to the GVT effect disabling tumor immunoavoidance. The chemotherapy/radiation conditioning prior to transplant is a required initiating event to the coupled GVT/GVHD effects. The conditioning releases 'danger' signals that mediate this adjuvant effect. To imitate this immunological event in immunocompetent, non-conditioned patients we propose that infusion of freshly activated, polyclonal CD4+ memory Th1 cells which express CD40L on the cell surface will stimulate a HVT/HVG 'mirror' effect, providing a non-toxic means to elicit the effective immune-mediated anti-tumor effect of BMT without the GVHD toxicity and without the requirement for a matched donor.


Asunto(s)
Trasplante de Médula Ósea/inmunología , Modelos Inmunológicos , Neoplasias/inmunología , Neoplasias/terapia , Trasplante de Células Madre , Inmunología del Trasplante/inmunología , Ligando de CD40/inmunología , Enfermedad Injerto contra Huésped/inmunología , Humanos , Células TH1/inmunología , Trasplante Homólogo
12.
Bone Marrow Transplant ; 41(1): 69-78, 2008 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-17994125

RESUMEN

Patients with myelodysplastic syndrome (MDS) commonly present with pancytopenia, suggesting that the marrow stroma fails to support the growth of both malignant and normal stem cells. We therefore retrospectively analyzed the duration to engraftment of neutrophils (> or =0.5 x 10(9)/l and > or =1.0 x 10(9)/l) and platelets (> or =20 and > or =50 x 10(9)/l) in 37 MDS patients and 42 patients suffering from primary AML, following allogeneic SCT. A significantly shorter time to engraftment was documented in AML as compared to MDS patients in all four parameters. These results held true even when we subgrouped the patients according to gender, age (50 years being the cutoff age between young and elderly patients), patient-donor relationship, donor match and intensity of conditioning. To the best of our knowledge, this is the first time that such a comparison has been made. We suggest that the longer duration of post transplant pancytopenia that is frequently observed in MDS patients may also influence post transplant outcome.


Asunto(s)
Trasplante de Células Madre Hematopoyéticas , Leucemia Mieloide Aguda/terapia , Síndromes Mielodisplásicos/terapia , Adolescente , Adulto , Anciano , Niño , Femenino , Humanos , Masculino , Persona de Mediana Edad , Análisis Multivariante , Factores de Tiempo , Acondicionamiento Pretrasplante , Trasplante Homólogo
13.
Haematologica ; 92(11): e106-10, 2007 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-18024386

RESUMEN

Androgens widely used in the treatment of bone marrow failure syndromes can in rare cases cause hepatic peliosis, a pathological entity characterized by multiple blood-filled cavities in the liver parenchyma. Bone marrow failure syndromes per se are associated with a low coagulation status, which is further magnified by bone marrow transplantation for aplastic anaemia due to deep thrombocytopenia. Both these conditions can cause bleeding; their combination is especially dangerous. We describe two cases of aplastic anaemia due to paroxysmal nocturnal hemoglobinuria and Fanconi syndrome, in which patients developed peliosis hepatis after prolonged treatment with androgens. One patient developed severe subcapsular bleeding, successfully treated with catheterization of the right hepatic artery and embolization of the bleeding site. The second patient bridged over deep post-transplant aplasia with high frequency platelet transfusions, and demonstrated an uncomplicated post-BMT course. We suggest avoiding or interrupting treatment with androgens in patients preparing for BMT.


Asunto(s)
Andrógenos/efectos adversos , Enfermedades de la Médula Ósea/complicaciones , Peliosis Hepática/inducido químicamente , Adulto , Andrógenos/uso terapéutico , Enfermedades de la Médula Ósea/tratamiento farmacológico , Niño , Contraindicaciones , Síndrome de Fanconi/complicaciones , Síndrome de Fanconi/tratamiento farmacológico , Femenino , Hemoglobinuria Paroxística/complicaciones , Hemoglobinuria Paroxística/tratamiento farmacológico , Humanos , Masculino , Peliosis Hepática/etiología , Esteroides/efectos adversos , Esteroides/uso terapéutico
14.
Bone Marrow Transplant ; 40(10): 957-64, 2007 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-17846604

RESUMEN

The only radical cure for thalassemia major patients today is the replacement of the defective hematopoietic system by allogeneic stem cell transplantation (allo-SCT). The major obstacles for the application of allo-SCT even from matched family members have been the transplant-related morbidity and mortality and graft failure that is usually associated with the recurrence of the thalassemia hematopoiesis. The outcome of allo-SCT from HLA-identical family donors is largely dependent on the age of the recipient as well as on pretransplant parameters reflecting the degree of organ damage from iron overload. In this study we report our experience of allo-SCT from matched related and unrelated donors, using a reduced toxicity conditioning consisting of fludarabine, busulfan or more recently busulfex and antithymocyte globulin, in a cohort of 20 patients with thalassemia major. The regimen-related toxicity was minimal, while the incidence of acute grade II-IV and chronic GVHD was 25 and 25%, respectively. With a median follow-up period of 39 months (range: 5-112 months) the overall survival was 100%, while thalassemia-free survival was 80%. Although the results of our study look promising, larger cohorts of patients and prospective clinical trials are required to confirm the benefits of our approach as a possible better alternative to the existing protocols.


Asunto(s)
Trasplante de Células Madre , Acondicionamiento Pretrasplante/métodos , Vidarabina/análogos & derivados , Talasemia beta/terapia , Adolescente , Adulto , Suero Antilinfocítico/uso terapéutico , Busulfano/uso terapéutico , Niño , Preescolar , Femenino , Rechazo de Injerto/etiología , Rechazo de Injerto/inmunología , Enfermedad Injerto contra Huésped/prevención & control , Humanos , Masculino , Persona de Mediana Edad , Trasplante de Células Madre/efectos adversos , Quimera por Trasplante/inmunología , Trasplante Homólogo , Vidarabina/uso terapéutico
15.
Bone Marrow Transplant ; 40(9): 891-6, 2007 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-17768389

RESUMEN

The use of thiotepa (TH) is increasing, especially in stem cell transplantation, mainly due to its safety and blood-brain barrier penetration. We evaluated the use of TH in a murine model simulating autologous stem cell transplantation, with or without additional agents. Between 1 and 11 days following inoculation of BALB/c mice with 10(5)-10(8) B-cell leukemia (BCL1) cells (simulating pre-transplant leukemia loads), each group received an 'induction-like' irradiation and/or cytotoxic regimen. Animals were either followed without treatment, or an adoptive transfer (AT) was performed to untreated BALB/c mice. Administered alone without AT, high-dose TH did not change the time to appearance of leukemia. Nevertheless, in the AT experiments, TH as a single agent showed better antileukemic activity than busulfan (BU). Cyclophosphamide (CY)-containing regimens were the most effective, and the TH-CY combination was as effective as the commonly used BU-CY combination, and more effective than the BU-TH combination. Moreover, a synergistic effect was seen in the TH-CY combination (none of the animals developed leukemia, whereas 4/10 animals in the CY-TBI group developed leukemia (P=0.029)). In conclusion, although TH produced only a moderate effect against BCL1 leukemia when used alone, its combination with CY is promising and should be tested further in allogeneic murine models and clinical studies.


Asunto(s)
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Trasplante de Células Madre Hematopoyéticas/métodos , Leucemia de Células B/tratamiento farmacológico , Tiotepa/uso terapéutico , Animales , Busulfano/uso terapéutico , Ciclofosfamida/uso terapéutico , Modelos Animales de Enfermedad , Sinergismo Farmacológico , Ratones , Ratones Endogámicos BALB C , Trasplante Autólogo , Resultado del Tratamiento
16.
Bone Marrow Transplant ; 40(9): 881-9, 2007 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-17704792

RESUMEN

Interleukin-7 (IL-7) plays a key role in maturation and function of both T and B cells. We investigate the potential use of recombinant human IL-7 for facilitation of graft-versus-leukemia (GVL) effects mediated by T cells following transplantation in a murine model. Administration of IL-7 in vivo to allogeneic-transplanted mice improved disease-free survival: 67% of mice treated with IL-7 remained alive and disease free for more than 60 days, in comparison to 17% of the controls (P<0.05). Similar results were obtained when C57BL/6 spleen cells sensitized against irradiated B-cell leukemia (BCL(1)) cells in the presence of IL-7 were transplanted to F(1) mice, followed by IL-7 treatment in vivo. Of the BALB/c mice that received spleen cells from F(1) mice treated with IL-7 following transplantation of C57BL/6 spleen cells sensitized with irradiated BCL(1) in the presence of IL-7, only 29% developed leukemia, as compared to 79% in the control group (P<0.05). Mice treated with IL-7 showed increased splenic and thymic cellularity and improved T cell-dependent proliferative responses compared to the controls (P<0.05). IL-7 may provide a novel tool to enhance immune reconstitution following transplantation of mismatched stem cells and for enhancement of GVL effects mediated by alloreactive lymphocytes.


Asunto(s)
Trasplante de Células/métodos , Sistema Inmunológico/fisiología , Interleucina-7/uso terapéutico , Leucemia de Células B/terapia , Linfoma de Células B/terapia , Bazo/citología , Traslado Adoptivo , Animales , Modelos Animales de Enfermedad , Supervivencia sin Enfermedad , Efecto Injerto vs Leucemia/efectos de los fármacos , Humanos , Interleucina-7/farmacología , Ratones , Ratones Endogámicos , Regeneración/efectos de los fármacos , Trasplante Homólogo
17.
Leukemia ; 21(11): 2324-31, 2007 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-17637813

RESUMEN

To evaluate the outcome of a large series of patients who received high-dose treatment (HDT) for follicular lymphoma (FL), 693 patients undergoing HDT (total-body irradiation (TBI)-containing regimen: 58%; autologous bone marrow (BM)/peripheral blood progenitor cells (PBPCs): 378/285 patients) were included in the study. A total of 375 patients (54%) developed recurrent lymphoma, 10-year progression-free survival (PFS) being 31%. On multivariate analysis, younger age (P=0.003) and HDT in first complete remission (CR1) (P<0.001) correlated with longer PFS. With a median follow-up of 10.3 years, 330 patients died. Ten-year overall survival (OS) from HDT was 52%. Shorter OS was associated on multivariate analysis with older age (P<0.001), chemoresistant disease (P<0.001), BM+PBPC as source of stem cells (P=0.007) and TBI-containing regimens (P=0.004). Thirty-nine patients developed secondary myelodysplastic syndrome/acute myeloid leukaemia (MDS/AML), in 34 cases having received TBI as the conditioning regimen. The 5-year non-relapse mortality (NRM) was 9%. On multivariate analysis, older age (P<0.001), refractory disease (P<0.001) and TBI (P=0.04) were associated with a higher NRM. This long follow-up study shows a plateau in the PFS curve, suggesting that a selected group of patients might be cured with HDT. On the downside, TBI-containing regimens are associated with a negative impact on survival.


Asunto(s)
Células Madre Hematopoyéticas/citología , Linfoma Folicular/terapia , Adolescente , Adulto , Células de la Médula Ósea/citología , Trasplante de Médula Ósea , Supervivencia sin Enfermedad , Femenino , Humanos , Masculino , Persona de Mediana Edad , Sistema de Registros , Inducción de Remisión , Células Madre/citología , Trasplante Autólogo , Resultado del Tratamiento
18.
Transplant Proc ; 39(3): 678-84, 2007 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-17445572

RESUMEN

Progress in the development of less toxic conditioning for bone marrow transplantation (BMT) came with the understanding that acceptance of mismatched BM does not require myeloablation of recipients. Lymphocyte deletion by a cocktail of immunosuppressive drugs is generally sufficient to ensure engraftment of compatible BM cells. However, reduced intensity conditioning (RIC) protocols available today do not provide robust tolerance to mismatched allogeneic BM. Herein we discuss 2 new experimental approaches to RIC protocols with the aim of facilitating allogeneic BM engraftment. Both conditioning regimens are based on selective deletion/inactivation of donor-reactive cells before BMT. Our data show that the first conditioning protocol, comprising priming of recipients by a donor-specific lymphocyte transfusion (DST) on day -2 and a single injection of cyclophosphamide, a drug that is predominantly toxic for proliferating cells, on day -1, consistently improves engraftment of allogeneic BM (day 0) in all experimental models tested. The second engraftment enhancing approach is based on the blockade by antagonistic reagents of the signaling pathways that govern the antigen-induced immune response. Combining the signaling blockade with the deletion of activated donor-reactive cells by cytoreductive agents provides additional benefits for transplantation across major histocompatibility barriers.


Asunto(s)
Trasplante de Médula Ósea/inmunología , Depleción Linfocítica/métodos , Acondicionamiento Pretrasplante/métodos , Animales , Trasplante de Médula Ósea/mortalidad , Prueba de Histocompatibilidad , Humanos , Isoanticuerpos/inmunología , Ratones , Análisis de Supervivencia , Donantes de Tejidos , Quimera por Trasplante , Trasplante Homólogo , Irradiación Corporal Total
19.
Crit Rev Oncol Hematol ; 64(1): 49-63, 2007 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-17303434

RESUMEN

The development of reduced intensity or non-myeloablative conditioning (NST) in preparation for allogeneic stem cell transplantation (SCT) revolutionized the field and led to reconsideration of the dogma of upper age limit that was set up by the transplant centers as an eligibility parameter. Analysis of the literature data showed that NST regimens are associated with decreased transplant related mortality, and graft-versus-host disease, in comparison with standard myeloablative conditioning, in patients above the age of 50-55 years, or in younger patients with significant comorbidities. However we have to mention, that our considerations are based on the retrospective analysis of the literature data, and that well controlled prospective randomized studies are needed in order to definitely assess the role of NST. Comorbidity indices might be proved as the most important parameters for the choice of the most proper regimen for each patient in need and should be included in future trials.


Asunto(s)
Trasplante de Células Madre Hematopoyéticas/métodos , Anciano , Anciano de 80 o más Años , Comorbilidad , Neoplasias Hematológicas/terapia , Trasplante de Células Madre Hematopoyéticas/efectos adversos , Trasplante de Células Madre Hematopoyéticas/mortalidad , Humanos , Persona de Mediana Edad , Pronóstico , Acondicionamiento Pretrasplante/efectos adversos , Acondicionamiento Pretrasplante/métodos , Acondicionamiento Pretrasplante/mortalidad , Resultado del Tratamiento
20.
AIDS Care ; 19(1): 130-7, 2007 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-17129868

RESUMEN

Recent rises in the incidence of HIV infections among gay men in Australia have produced widespread discussion about appropriate health promotion responses. This has sometimes included calls for a return to fear-based campaigns, exemplified by the Grim Reaper advertisements in HIV. This paper discusses results from four focus groups that tested mock campaign material based on an appeal to fear. Five different poster images were tested among groups distinguished by age and HIV serostatus. Three posters used side-effects from treatments as the fear trigger and two used death from AIDS. A number of themes arose in response to the material including 'othering', shame and scepticism about HIV treatments. The meanings of these themes are explored in the light of current health-promotion theory. This data demonstrates that fear is an ineffective tool for HIV health promotion. It further demonstrates that feelings of shame and stigma are likely to be exacerbated in gay men, leading to poorer health outcomes in various ways.


Asunto(s)
Publicidad/métodos , Miedo/psicología , Infecciones por VIH/prevención & control , Promoción de la Salud/métodos , Homosexualidad Masculina/psicología , Adulto , Antirretrovirales/efectos adversos , Grupos Focales , Infecciones por VIH/psicología , Humanos , Masculino , Nueva Gales del Sur/epidemiología
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA