RESUMEN
BACKGROUND: Non-anatomical liver resections have become more common in the management of colorectal liver metastases. This study examined survival and patterns of recurrence following surgery for colorectal liver metastases. METHODS: Data were collected prospectively on all patients who had hepatic surgery for colorectal liver metastases at St James' University Hospital, Leeds between 1993 and May 2003, and analysed with respect to type of resection. RESULTS: A total of 96 patients underwent non-anatomical liver resection, 280 patients had an anatomical resection, and 108 patients had a combined procedure. There was no significant difference in overall survival between the anatomical and non-anatomical groups (hazard ratio 1.14 (95 per cent confidence interval 0.60 to 2.17); P = 0.691). Intrahepatic recurrence was significantly less common in the anatomical group, whereas morbidity and mortality rates were lower in the non-anatomical group. On multivariable analysis, multiple metastases and poorer primary T stage predicted poorer overall survival and a positive resection margin predicted poorer disease-free survival. CONCLUSION: Non-anatomical resection can be performed with lower rates of surgical morbidity and mortality than anatomical resection, and does not disadvantage the patient in terms of overall survival.
Asunto(s)
Neoplasias Colorrectales , Hepatectomía/métodos , Neoplasias Hepáticas/secundario , Adulto , Anciano , Anciano de 80 o más Años , Supervivencia sin Enfermedad , Femenino , Hepatectomía/estadística & datos numéricos , Humanos , Tiempo de Internación , Neoplasias Hepáticas/mortalidad , Neoplasias Hepáticas/cirugía , Masculino , Persona de Mediana Edad , Recurrencia Local de Neoplasia/mortalidad , Complicaciones Posoperatorias/etiología , Estudios Prospectivos , Factores de Riesgo , Resultado del TratamientoRESUMEN
BACKGROUND: This study was undertaken to determine the quality of information on the Internet regarding laparoscopy. METHODS: Four popular World Wide Web search engines were used with the key word "laparoscopy." Advertisements, patient- or physician-directed information, and controversial material were noted. RESULTS: A total of 14,030 Web pages were found, but only 104 were unique Web sites. The majority of the sites were duplicate pages, subpages within a main Web page, or dead links. Twenty-eight of the 104 pages had a medical product for sale, 26 were patient-directed, 23 were written by a physician or group of physicians, and six represented corporations. The remaining 21 were "miscellaneous." The 46 pages containing educational material were critically reviewed. At least one of the senior authors found that 32 of the pages contained controversial or misleading statements. All of the three senior authors (LKN, NAO, GAF) independently agreed that 17 of the 46 pages contained controversial information. CONCLUSION: The World Wide Web is not a reliable source for patient or physician information about laparoscopy. Authenticating medical information on the World Wide Web is a difficult task, and no government or surgical society has taken the lead in regulating what is presented as fact on the World Wide Web.
Asunto(s)
Indización y Redacción de Resúmenes , Centros de Información/normas , Internet/normas , Laparoscopía , Indización y Redacción de Resúmenes/métodos , Indización y Redacción de Resúmenes/normas , Indización y Redacción de Resúmenes/tendencias , Bases de Datos como Asunto/normas , Humanos , Educación del Paciente como Asunto , Control de CalidadRESUMEN
Both CD4+ and CD8+ T cells that produce IL-2 in response to Ag recognition have been isolated. However, most effector CD8+ T cells recovered after exposure to Ag do not produce sufficient IL-2 to sustain growth, and depend on CD4+ T helper cells for this obligate growth factor. IL-2 expression in CD4+ T cells is primarily controlled at the level of transcription, but mechanisms restricting IL-2 production in CD8+ T cells have not been elucidated. To evaluate transcriptional regulation of the IL-2 gene in CD8+ T cells, we stably transfected reporter genes into Ag-specific CD8+ T cell clones. CD28+ CD8(+) T cells unable to transcribe the IL-2 gene in response to antigenic stimulation had a block in transactivation of the -150 CD28 response element (CD28RE)/AP-1 site of the IL-2 promoter, but did transactivate the composite NFAT/AP-1 and OCT/AP-1 sites, and a consensus AP-1 motif. Mutation of the nonconsensus -150 AP-1 site to a consensus AP-1 site, or insertion of a CD28RE/AP-1 consensus site upstream of the native -150 CD28RE/AP-1 site restored transactivation of the altered promoter. These results suggest that the defect at the -150 site may reflect the absence or inactivity of a required factor rather than repression of the IL-2 promoter.
Asunto(s)
Regiones no Traducidas 5'/inmunología , Linfocitos T CD8-positivos/metabolismo , Interleucina-2/genética , Regiones Promotoras Genéticas/inmunología , Factor de Transcripción AP-1/genética , Transcripción Genética/inmunología , Regiones no Traducidas 5'/antagonistas & inhibidores , Regiones no Traducidas 5'/metabolismo , Secuencias de Aminoácidos/genética , Animales , Antígenos/inmunología , Sitios de Unión/genética , Sitios de Unión/inmunología , Antígenos CD28/biosíntesis , Antígenos CD28/genética , Complejo CD3/biosíntesis , Antígenos CD8/biosíntesis , Linfocitos T CD8-positivos/inmunología , Línea Celular , Células Clonales , Secuencia de Consenso/genética , Interleucina-2/antagonistas & inhibidores , Interleucina-2/biosíntesis , Ratones , Ratones Endogámicos BALB C , Mutagénesis Sitio-Dirigida , ARN Mensajero/biosíntesis , ARN Mensajero/genética , Elementos de Respuesta/genética , Elementos de Respuesta/inmunología , Factor de Transcripción AP-1/antagonistas & inhibidores , Factor de Transcripción AP-1/biosíntesis , Activación Transcripcional/inmunología , Células Tumorales CultivadasRESUMEN
Using a TCR transgenic mouse bred onto a recombinase-activating gene-2-deficient background, we have examined the influence of B7.1 and B7.2 on activation of naive, CD8+ T cells in vitro. We found that B7.1 was a more potent costimulus than B7.2 for induction of proliferation and IL-2 production by naive CD8+ T cells. This difference appeared to be quantitative in nature, as determined using transfectants expressing various defined levels of B7.1 or B7.2, or using purified B7.1 or B7.2 fusion proteins. In contrast to the quantitative differences seen in stimulation of naive T cells, B7.1 and B7.2 were comparable in their ability to costimulate responses in T cells previously primed in vitro. In addition, primed, but not naive, T cells were capable of proliferating and producing IL-2 in response to a TCR stimulus alone, apparently in the absence of B7 costimulation. Lastly, we found that B7.1 and B7.2 were equivalently capable of driving differentiation of naive CD8+ T cells into an IL-4-producing phenotype when exogenous IL-4 was added to the primary culture or to an IFN-gamma-producing phenotype in the presence of IL-12. These results indicate that signals generated by B7.1 and B7.2 are qualitatively similar, but that B7.1 is quantitatively stronger than B7.2. Further, our results indicate that the activation state of the responding T cell may influence the efficiency with which the T cell can respond to a costimulatory signal provided by either B7.1 or B7.2.
Asunto(s)
Antígenos CD/inmunología , Antígeno B7-1/inmunología , Linfocitos T CD8-positivos/inmunología , Activación de Linfocitos/inmunología , Glicoproteínas de Membrana/inmunología , Receptores de Antígenos de Linfocitos T/genética , Subgrupos de Linfocitos T/inmunología , Animales , Anticuerpos Monoclonales/farmacología , Antígenos CD/biosíntesis , Antígenos CD/genética , Antígeno B7-1/biosíntesis , Antígeno B7-1/genética , Antígeno B7-2 , Complejo CD3/inmunología , Linfocitos T CD8-positivos/metabolismo , Proteínas de Homeodominio/genética , Humanos , Activación de Linfocitos/genética , Sarcoma de Mastocitos , Glicoproteínas de Membrana/biosíntesis , Glicoproteínas de Membrana/genética , Ratones , Ratones Mutantes , Ratones Transgénicos , Proteínas Recombinantes de Fusión/inmunología , Proteínas Recombinantes de Fusión/farmacología , Subgrupos de Linfocitos T/metabolismo , Transfección/inmunología , Células Tumorales CultivadasRESUMEN
In an intensely malarious area in north-east Tanzania, microencapsulated lambdacyhalothrin was used in four villages for treatment of bednets (provided free of charge) and in another four villages the same insecticide was used for house spraying. Another four villages received neither intervention until the end of the trial but were monitored as controls. Bioassays showed prolonged persistence of the insecticidal residues. Light traps and ELISA testing showed reduction of the malaria vector populations and the sporozoite rates, leading to a reduction of about 90% in the entomological inoculation rate as a result of each treatment. Collections of blood fed mosquitoes showed no diversion from biting humans to biting animals. Incidence of re-infection was measured by weekly monitoring of cohorts of 60 children per village, after clearing preexisting infection with chlorproguanil-dapsone. The vector control was associated with a reduction in probability of re-infection per child per week by 54-62%, with no significant difference between the two vector control methods. Cross-sectional surveys for fever, parasitaemia, haemoglobin and weight showed association of high parasitaemia with fever and anaemia and beneficial effects of each intervention in reducing anaemia. However, passive surveillance by resident health assistants showed no evidence for reduced prevalence of fever or parasitaemia. Net treatment consumed only about one sixth as much insecticide as house spraying and it was concluded that the former intervention would work out cheaper and nets were actively demanded by the villagers, whereas spraying was only passively assented to.
Asunto(s)
Ropa de Cama y Ropa Blanca , Vivienda , Insecticidas , Malaria/prevención & control , Malaria/transmisión , Piretrinas , Estudios de Casos y Controles , Niño , Preescolar , Estudios de Cohortes , Estudios Transversales , Femenino , Humanos , Incidencia , Lactante , Masculino , Nitrilos , Recurrencia , Vigilancia de Guardia , Tanzanía , Factores de TiempoAsunto(s)
Traslado Adoptivo , Trasplante de Médula Ósea , Técnicas de Transferencia de Gen , Neoplasias/terapia , Linfocitos T/inmunología , Virosis/terapia , Linfocitos T CD4-Positivos/inmunología , Linfocitos T CD8-positivos/inmunología , Células Clonales , Infecciones por Citomegalovirus/terapia , Infecciones por VIH/terapia , Humanos , Leucemia/terapia , Modelos Biológicos , Neoplasias/inmunología , Virosis/inmunologíaRESUMEN
To examine the effect of self Ag on activation requirements of TCR-alphabeta intestinal intraepithelial lymphocytes (IELs), we utilized the 2C transgenic (Tg) mouse model specific for a peptide self Ag presented by class I MHC, H-2Ld. CD8alpha alpha and CD4-CD8- IELs from syngeneic (H-2b, self Ag-) and self Ag-bearing (H-2b/d, self Ag+) strains were examined for their ability to respond in vitro to P815 (H-2d) cell lines expressing the endogenous antigenic peptide, p2Ca. Proliferation, cytokine production, and CTL activity were elicited in IEL T cells isolated from self Ag- H-2b mice when stimulated with P815 cells expressing basal levels of self Ag. These responses were enhanced following the addition of exogenous p2Ca peptide and ectopic expression of the costimulatory molecule, B7-1. By comparison, IEL from self Ag-bearing mice failed to respond to basal levels of self Ag presented by P815 cells even in the presence of B7-1-mediated costimulation. However, the addition of increasing amounts of exogenous p2Ca peptide induced a response from the in vivo "tolerized" T cells. These results suggest that exposure to self Ag in vivo increased the threshold of TCR activation of Ag-exposed self-reactive IELs. The dependence of increased signal 1 to activate self-reactive IELs suggests a defect in TCR signaling that may maintain self tolerance in vivo. These data suggest that conditions that overcome signal 1 IEL defects may initiate autoreactive responses in the intestine.
Asunto(s)
Células Epiteliales/inmunología , Mucosa Intestinal/inmunología , Activación de Linfocitos , Subgrupos Linfocitarios/inmunología , Receptores de Antígenos de Linfocitos T alfa-beta/fisiología , Animales , Supervivencia Celular/inmunología , Citocinas/biosíntesis , Citotoxicidad Inmunológica , Femenino , Antígenos H-2/fisiología , Subgrupos Linfocitarios/metabolismo , Masculino , Sarcoma de Mastocitos , Ratones , Ratones Endogámicos BALB C , Ratones Endogámicos C57BL , Ratones Transgénicos , Péptidos/inmunología , Transducción de Señal/inmunología , Células Tumorales CultivadasRESUMEN
BACKGROUND: Cytomegalovirus (CMV) disease in immunocompromised patients correlates with a deficiency of CD8+ cytotoxic T lymphocytes specific for CMV. We evaluated the safety and immunologic effects of immunotherapy with clones of these lymphocytes in recipients of allogeneic bone marrow transplants. METHODS: Clones of CD8+ cytotoxic T cells specific for CMV proteins were isolated from the blood of bone marrow donors. Fourteen patients each received four intravenous infusions of these clones from their donors beginning 30 to 40 days after marrow transplantation. The reconstitution of cellular immunity against CMV was monitored before and during the period of infusions and for up to 12 weeks after the final infusion. The rearranged genes encoding the T-cell receptor served as markers in evaluating the persistence of the transferred T cells. RESULTS: No toxic effects related to the infusions were observed. Cytotoxic T cells specific for CMV were reconstituted in all patients. In vitro measurements showed that cytotoxic activity against CMV was significantly increased (P < 0.001) after the infusions in 11 patients who were deficient in such activity before therapy. The level of activity achieved after the infusions was similar to that measured in the donors. Analysis of rearranged T-cell-receptor genes in T cells obtained from two recipients indicated that the transferred clones persisted for at least 12 weeks. Cytotoxic-T-cell activity declined in patients deficient in CD4+ T-helper cells specific for CMV, suggesting that helper-T-cell function is needed for the persistence of transferred CD8+ T cells. Neither CMV viremia nor CMV disease developed in any of the 14 patients. CONCLUSIONS: The transfer of CMV-specific clones of CD8+ T cells derived from the bone marrow donor is a safe and effective way to reconstitute cellular immunity against CMV after allogeneic marrow transplantation.
Asunto(s)
Infecciones por Citomegalovirus/prevención & control , Citomegalovirus/inmunología , Inmunoterapia Adoptiva , Linfocitos T Citotóxicos/trasplante , Adolescente , Adulto , Trasplante de Médula Ósea/efectos adversos , Trasplante de Médula Ósea/inmunología , Células Clonales , Infecciones por Citomegalovirus/etiología , Infecciones por Citomegalovirus/inmunología , Femenino , Humanos , Inmunidad Celular , Terapia de Inmunosupresión/efectos adversos , Inmunoterapia Adoptiva/efectos adversos , Masculino , Persona de Mediana Edad , Linfocitos T Citotóxicos/inmunología , Trasplante Homólogo/inmunología , Resultado del TratamientoRESUMEN
Mouse mammary tumor virus proviral integrants encode superantigens. Developing thymocytes bearing TCRs with particular V beta elements encounter these endogenous viral superantigens as self molecules in the thymus and are consequently clonally eliminated. To study this mechanism of tolerance induction, we have bred B10.BR-Mtv-1 and B10.BR-Mtv-6 mice, which carry either Mtv-1 or Mtv-6 proviruses but are otherwise genetically identical. The protein products of these mouse mammary tumor virus integrants, vSAG1 and vSAG6, both interact with V beta 3+ T cells and have identical amino acid sequences. Interestingly, vSAG6 expression results in the complete deletion of V beta 3+ peripheral T cells, whereas vSAG1 expression results in only partial deletion. Flow cytometric analyses indicate that B10.BR-Mtv-6 mice delete V beta 3+ thymocytes at the immature CD4+8+ stage, whereas B10.BR-Mtv-1 mice delete only mature CD4+ or CD8+ cells. In addition, the two strains exhibit different time courses of thymic deletion: neonatal B10.BR-Mtv-6 mice eliminate V beta 3+ T cells by day 2, in contrast to B10.BR-Mtv-1 mice in which deletion does not occur until day 15. RNase protection assays demonstrate that B10.BR-Mtv-6 mice have significantly greater thymic vSAG6 mRNA expression levels than vSAG1 levels in B10.BR-Mtv-1 animals, correlating with a more complete deletion of reactive thymocytes at an earlier point in the maturational sequence.
Asunto(s)
Virus del Tumor Mamario del Ratón/inmunología , Superantígenos/biosíntesis , Timo/crecimiento & desarrollo , Animales , Secuencia de Bases , Citometría de Flujo , Tolerancia Inmunológica/inmunología , Técnicas para Inmunoenzimas , Activación de Linfocitos , Ratones , Ratones Endogámicos C3H , Ratones Transgénicos , Datos de Secuencia Molecular , Receptores de Antígenos de Linfocitos T alfa-beta/inmunología , Bazo/citología , Superantígenos/genética , Superantígenos/inmunología , Linfocitos T/inmunología , Timo/citología , Timo/inmunologíaRESUMEN
Cultured human myeloma cells of the U266 line and leukemic T cells of the Jurkat line bound synthetic [125I]Tyr10-vasoactive intestinal peptide1-28 ([125I]VIP1-28) specifically and with an affinity similar to that of neuroendocrine cells. Specific binding reached equilibrium after 2 h at 22 degrees C for both myeloma cells and T cells, attained a maximum of 57 to 71% of total binding, and was reversed in 1.5 to 3 h by an excess of non-radioactive VIP1-28. Analyses of the ligand concentration-dependence of binding of the ligand concentration-dependence of binding of [125I]VIP1-28 revealed a mean Kd of 7.6 nM for a mean of 41,207 receptors per myeloma cell and 5.2 nM for 12,266 receptors per T cell. The relative affinity of binding of mast cell-derived VIP10-28 free acid and synthetic analogues suggested differences in specificity between lymphocyte and neuroendocrine receptors. Distinct sets of receptors thus appear to mediate the effects of VIP on functions of both antibody-producing cells and T cells.