RESUMEN
INTRODUCTION: The aim was to produce a multidisciplinary consensus to determine the current position on the nomenclature, definition, diagnosis, imaging modalities and management of Sportsman's groin (SG). METHODS: Experts in the diagnosis and management of SG were invited to participate in a consensus conference held by the British Hernia Society in Manchester, U.K. on 11-12 October 2012. Experts included a physiotherapist, a musculoskeletal radiologist and surgeons with a proven track record of expertise in this field. Presentations detailing scientific as well as outcome data from their own experiences were given. Records were made of the presentations with specific areas debated openly. RESULTS: The term 'inguinal disruption' (ID) was agreed as the preferred nomenclature with the term 'Sportsman's hernia' or 'groin' rejected, as no true hernia exists. There was an overwhelming agreement of opinion that there was abnormal tension in the groin, particularly around the inguinal ligament attachment. Other common findings included the possibility of external oblique disruption with consequent small tears noted as well as some oedema of the tissues. A multidisciplinary approach with tailored physiotherapy as the initial treatment was recommended with any surgery involving releasing the tension in the inguinal canal by various techniques and reinforcing it with a mesh or suture repair. A national registry should be developed for all athletes undergoing surgery. CONCLUSIONS: ID is a common condition where no true hernia exists. It should be managed through a multidisciplinary approach to ensure consistent standards and outcomes are achieved.
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Dolor Abdominal/etiología , Medicina Deportiva , Dolor Abdominal/rehabilitación , Dolor Abdominal/cirugía , Dolor Crónico , Consenso , Diagnóstico Diferencial , Diagnóstico Precoz , Terapia por Ejercicio/métodos , Ingle , Hernia Inguinal/diagnóstico , Humanos , Conducto Inguinal , Imagen por Resonancia Magnética , Grupo de Atención al Paciente , Dolor de Cintura Pélvica/complicaciones , Dolor de Cintura Pélvica/diagnóstico por imagen , Modalidades de Fisioterapia , Radiografía Intervencional , Terminología como Asunto , UltrasonografíaRESUMEN
Insertional tendinopathy of the adductor longus is a common and problematic condition in elite athletes and may lead to rupture. Previous literature has reported good outcomes in these patients when these ruptures are treated with both surgical and non-operative management. This paper will discuss the available literature on management of adductor tears and describe two case reports of deep infection following surgical repair of ruptures in soccer players and the effects this had on their profession. We conclude that, given the overall evidence of conservative management of adductor tears and possible complications associated with the surgery that these cases highlight, acute adductor tears in the majority should be treated conservatively.
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Fútbol Americano , Rotura/diagnóstico , Tendinopatía/diagnóstico , Humanos , Masculino , Rotura/cirugía , Tendinopatía/cirugía , Tomografía Computarizada por Rayos XRESUMEN
The use of the antegrade continence enema (ACE) is becoming more widespread. Preliminary studies have been promising, but the procedure is not universally successful. A colonoscopic insertion of a caecostomy button is a relatively minor procedure. This allows the ACE to be used for a trial period to assess whether a permanent procedure would be beneficial. If successful, enemas can be continued by the caecostomy, or a formal ACE can be performed. We report a series of five patients who underwent staged endoscopic insertion of a MIC-KEY caecostomy button, and we discuss the technical aspects of the procedure.
Asunto(s)
Estreñimiento/cirugía , Enema/instrumentación , Laparoscopía , Adulto , Femenino , Humanos , Persona de Mediana Edad , Complicaciones Posoperatorias , Resultado del TratamientoRESUMEN
OBJECTIVE: The aim of this study was to evaluate the long-term results of the Antegrade Continent Enema (ACE) procedure for treating severe constipation in adults. METHODS: Over 10 years 37 ACE conduits were created in 32 patients (median age 35 years, 26 women) with constipation caused by slow transit, obstructed defaecation or both. Conduits were created from the appendix (n = 20, 54%), ileum (n = 10, 27%), neoappendix caecostomy (n = 5, 14%) or colon (n = 2, 5%). Clinical records were retrospectively reviewed to determine outcome. RESULTS: After a median follow up of 36 (range 13-140) months, 28 (88%) required at least one further procedure on a primary conduit, including reversal in 19 (59%). Five patients had a second conduit fashioned, two successfully. Conduit type and constipation cause did not significantly influence the rates of ACE reversal or major revision. Ileal conduits were associated with fewer minor revision procedures for stenosis (1 in 7 patients) than appendix conduits (21 in 20 patients). There was one (3%) serious complication. Satisfactory ACE function was ultimately achieved in 47% of patients, at last follow up. After ACE reversal, 9 (28%) patients underwent formation of an end stoma and 3 patients had a colectomy. CONCLUSIONS: Revision procedures are common, but approximately half of patients can expect satisfactory long-term ACE function. ACE conduit reversal does not preclude subsequent alternative surgical strategies to treat this difficult condition.
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Estreñimiento/diagnóstico , Estreñimiento/cirugía , Enema/métodos , Estomas Quirúrgicos , Adolescente , Adulto , Anciano , Apéndice/cirugía , Cecostomía/métodos , Estudios de Cohortes , Defecación/fisiología , Femenino , Estudios de Seguimiento , Humanos , Laparoscopía/métodos , Masculino , Persona de Mediana Edad , Satisfacción del Paciente , Probabilidad , Estudios Retrospectivos , Medición de Riesgo , Índice de Severidad de la Enfermedad , Estadísticas no Paramétricas , Resultado del TratamientoRESUMEN
BACKGROUND: Violence involving the use of firearms has increased in the UK over the past decade. This study assesses the implications of such injuries for service provision and training by reviewing the experience at one hospital. METHODS: Accident and emergency triage data were searched for patients presenting with gunshot wounds over a 54-month period. Case notes were reviewed and patterns of care established. The resources required for clinical management were ascertained, and the financial consequences determined at contemporary full cost. RESULTS: There were 187 attendances with 247 wounds. Mean age was 21 years (range, 8-63 years). Of the attendances, 69% were out of normal working hours. Of the 187 cases, 97 patients were admitted to one hospital (83 of whom required surgery) and 10 patients were transferred to other hospitals (6 for plastic surgery not available at the Manchester Royal Infirmary and 4 due to lack of beds). Of the 80 patients who were not admitted, 4 died in accident and emergency, the rest were either air gun wounds or relatively simple higher calibre injuries. A wide range of surgical specialties was involved (limb injury, 53; thoraco-abdominal and vascular, 28; head and neck, 5; and orbit, 2), and combinations of injuries transgressed specialty and sub-specialty boundaries. The total cost of patient care was pound 267,000. CONCLUSIONS: Gunshot wounds present a heavy demand on the clinical and financial resources of the receiving hospital, and surgeons responsible for unselected acute admissions in "general surgery" should be capable of dealing with these indiscriminate injuries. Current training and service trends towards increasing sub-specialisation may mitigate against them achieving or retaining this capability.
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Hospitalización/estadística & datos numéricos , Heridas por Arma de Fuego/epidemiología , Adolescente , Adulto , Niño , Costos y Análisis de Costo , Inglaterra/epidemiología , Femenino , Hospitales de Enseñanza/estadística & datos numéricos , Humanos , Imagen por Resonancia Magnética , Masculino , Persona de Mediana Edad , Heridas por Arma de Fuego/economíaRESUMEN
OBJECTIVE: To assess the outcome of preperitoneal mesh repair of complex incisional herniae incorporating a stoma and large parastomal hernia. METHODS: From 1994 to 1998, symptomatic patients who had repair of combined incisional hernia and parastomal hernia were reviewed. Body mass index, co-morbidity, length of hospital stay, patient satisfaction and outcomes were recorded. RESULTS: Ten patients (seven females and three males), mean age 62 (range 48-80) years underwent primary repair. All had significant comorbidities (ASA grade 3) and mean body mass index was 31.1 (range 20-49). Median hospital stay was 15 (range 8-150) days. Complications were of varying clinical significance (seroma, superficial infection, major respiratory tract infection and stomal necrosis). There were no recurrences after a mean follow up of 54 (range 22-69) months. CONCLUSION: The combination of a parastomal hernia and generalised wound dehiscence is an uncommon but difficult problem. The application of the principles of low-tension mesh repair can provide a satisfactory outcome and low recurrence rate. This must be tempered by recognition of the potential for significant major postoperative complication.
RESUMEN
Oral clodronate (1600 mg/d) has been shown to significantly reduce the incidence of skeletal complications in multiple myeloma. Preliminary analysis of a double-blind placebo-controlled trial of this treatment indicated that clodronate might prolong survival in patients without vertebral fractures at presentation. This issue was re-examined after further follow-up of the patients recruited into the Medical Research Council (MRC) VIth Myeloma Study. The trial examined the effects of clodronate on the natural history of skeletal disease in multiple myeloma; 619 patients were randomized between June 1986 and May 1992 commencing 15 d after the start of ABCM [adriamycin, BCNU (carmustine), cyclophosphamide, melphalan] chemotherapy or 43 d after ABCMP (ABCM + prenisolone); 535 patients who received clodronate or placebo were included in the analysis. The presence or absence of spinal fractures was assessed centrally from spinal X-rays; long-bone fractures were assessed locally. With a median follow-up of 8.6 years, there was no overall significant difference in survival between the two treatment groups (O/E, chi2 = 0.78, P = 0.38). Among the subgroup of 153 patients with no skeletal fractures at presentation there was a significant survival advantage (O/E, chi2 = 7.52, P = 0.006) in favour of the 73 patients receiving clodronate, with median survivals being, respectively, 59 months (95% CI 43-71 months) and 37 months (95% CI 31-52 months), and 5-year survivals being 46% and 35%. The original analysis of this study shows that there is a benefit in taking 1600 mg clodronate daily for patients with myelomatosis to prevent the development of new skeletal disease. Bearing in mind the limitations of subgroup analysis, the present study indicates that treatment may prolong survival in patients without overt skeletal disease at diagnosis. These observations, however, require confirmation in prospective clinical trials.
Asunto(s)
Analgésicos no Narcóticos/uso terapéutico , Ácido Clodrónico/uso terapéutico , Mieloma Múltiple/tratamiento farmacológico , Anciano , Distribución de Chi-Cuadrado , Método Doble Ciego , Femenino , Estudios de Seguimiento , Humanos , Masculino , Persona de Mediana Edad , Mieloma Múltiple/complicaciones , Mieloma Múltiple/mortalidad , Pronóstico , Estudios Prospectivos , Análisis de Regresión , Fracturas de la Columna Vertebral/complicaciones , Fracturas de la Columna Vertebral/tratamiento farmacológico , Fracturas de la Columna Vertebral/mortalidad , Análisis de SupervivenciaRESUMEN
X-linked immunodeficient (Xid) mice carry a Bruton's tyrosine kinase (Btk) mutation and exhibit a selective failure to produce antibodies against bacterial capsular polysaccharides. Studies in vitro point to a fundamental survival defect of Xid B cells after receptor cross-linking by thymus-independent type-2 (TI-2) antigen because B cells undergo apoptosis without proliferating. We describe results from a novel model, which we have used to investigate the impact of the Xid mutation on migration, proliferation and differentiation of B cells after polysaccharide immunization in vivo. Immunoglobulin knock-in mice, in which a large proportion of B cells express transgene-encoded receptors specific for (4-hydroxy-3-nitrophenyl)-acetyl (NP), were crossed with CBA/N mice. The male progeny contain NP-specific Xid B cells, while the female progeny contain NP-specific B cells with normal Btk. After immunization with the TI-2 antigen NP-Ficoll, NP-specific Xid B cells migrate to the T zones and proliferate. Despite transient up-regulation of blimp-1 and survival beyond the time when terminal differentiation is normally underway, Btk-defective B cells fail to differentiate to plasmablasts or germinal center cells. CD40 ligation partially restores their ability to form plasma cells in response to TI-2 antigen.
Asunto(s)
Antígenos T-Independientes/inmunología , Linfocitos B/citología , Linfocitos B/inmunología , Diferenciación Celular , Quimiotaxis de Leucocito , Síndromes de Inmunodeficiencia/inmunología , Proteínas Tirosina Quinasas/genética , Proteínas Represoras , Agammaglobulinemia Tirosina Quinasa , Animales , Anticuerpos/inmunología , Apoptosis , Linfocitos B/enzimología , Linfocitos B/metabolismo , Antígenos CD40/inmunología , Antígenos CD40/metabolismo , División Celular , Células Cultivadas , Femenino , Eliminación de Gen , Ligamiento Genético/genética , Síndromes de Inmunodeficiencia/enzimología , Síndromes de Inmunodeficiencia/genética , Activación de Linfocitos , Masculino , Ratones , Ratones Transgénicos , Nitrofenoles/inmunología , Fenotipo , Factor 1 de Unión al Dominio 1 de Regulación Positiva , Proteínas Tirosina Quinasas/metabolismo , ARN Mensajero/genética , ARN Mensajero/metabolismo , Factores de Transcripción/metabolismo , Regulación hacia Arriba , Cromosoma X/genéticaRESUMEN
During T cell-dependent antibody responses lymph node B cells differentiate either to plasmablasts that grow in the medullary cords, or to blasts that proliferate in follicles forming germinal centers. Many plasmablasts differentiate to plasma cells locally, but some leave the medullary cords and migrate to downstream lymph nodes. To assess the basis for this migration, changes in the responsiveness of B cells to a range of chemokines have been studied as they differentiate. Naive B cells express high levels of CCR6, CCR7, CXCR4 and CXCR5. When activated B cells grow in follicles the expression of these chemokine receptors and the responsiveness to the respective chemokines is retained. During the extrafollicular response, plasmablast expression of CXCR5 and responsiveness to B-lymphocyte chemoattractant (CXCR5) as well as to secondary lymphoid tissue chemokine (CCR7) and stromal cell-derived factor (SDF)-1 (CXCR4) are lost while a weak response towards the CCR6 chemokine LARC is maintained. Despite losing responsiveness to SDF-1, extrafollicular plasmablasts still express high levels of CXCR4 on the cell surface. These results suggest that the combined loss of chemokine receptor expression and of chemokine responsiveness may be a necessary prerequisite for cells to migrate to the medullary cords and subsequently enter the efferent lymph.
Asunto(s)
Linfocitos B/fisiología , Quimiocinas/fisiología , Células Madre Hematopoyéticas/fisiología , Ganglios Linfáticos/citología , Células Plasmáticas/fisiología , Animales , Diferenciación Celular , Movimiento Celular , Pollos , Femenino , Virus del Tumor Mamario del Ratón/inmunología , Ratones , Ratones Endogámicos BALB C , Receptores de Quimiocina/análisis , Receptores de Quimiocina/fisiología , gammaglobulinas/inmunologíaRESUMEN
B cells recruited into splenic antibody responses grow exponentially, either in extrafollicular foci as plasmablasts, or in follicles where they form germinal centers. Both responses yield plasma cells. Although many splenic plasma cells survive <3 d, some live much longer. This study shows that early plasma cell death relates to a finite capacity of the spleen to sustain plasma cells rather than a life span endowed by the cell's origin or the quality of antibody it produces. Antibody responses were compared where the peak numbers of plasma cells in spleen sections varied between 100 and 5,000 cells/mm(2). In each response, plasmablast clones divided some five times, with the peak numbers of plasma cells produced relating directly to the number of B cells recruited into the response. The spleen seems to have the capacity to sustain between 20 and 100 plasma cells/mm(2). When this number is exceeded, there is a loss of excess cells. Immunoglobulin variable region gene sequencing, and 5-bromo-2'-deoxyuridine pulse-chase studies indicate that long-lived splenic plasma cells are a mixture of cells derived from the extrafollicular and germinal center responses and cells derived from virgin and memory B cells. Only a proportion has switched immunoglobulin class.
Asunto(s)
Supervivencia Celular/fisiología , Células Plasmáticas/citología , Células Plasmáticas/inmunología , Bazo/inmunología , Animales , Formación de Anticuerpos , Linfocitos B/citología , Linfocitos B/inmunología , Pollos , Femenino , Regulación de la Expresión Génica/inmunología , Genes de Inmunoglobulinas , Haptenos , Región Variable de Inmunoglobulina/genética , Ratones , Ratones Endogámicos C57BL , Ratones Endogámicos , Bazo/citología , Factores de Tiempo , gammaglobulinas/inmunologíaRESUMEN
Antigens such as viral envelope proteins and bacterial exotoxins induce responses which result in the production of neutralizing antibody. These responses persist for years and provide highly efficient defence against reinfection. During these antibody responses a proportion of participating B cells mutate the genes that encode their immunoglobulin variable regions. This can increase the affinity of the antibody, but can also induce autoreactive B cells. Selection mechanisms operate which allow the cells with high affinity for the provoking antigen to persist, while other B cells recruited into the response die.
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Anticuerpos Antibacterianos/inmunología , Anticuerpos Antivirales/inmunología , Linfocitos B/inmunología , Memoria Inmunológica/inmunología , Animales , Afinidad de Anticuerpos/inmunología , Humanos , InmunofenotipificaciónRESUMEN
Germinal centers are critical for affinity maturation of antibody (Ab) responses. This process allows the production of high-efficiency neutralizing Ab that protects against virus infection and bacterial exotoxins. In germinal centers, responding B cells selectively mutate the genes that encode their receptors for antigen. This process can change Ab affinity and specificity. The mutated cells that produce high-affinity Ab are selected to become Ab-forming or memory B cells, whereas cells that have lost affinity or acquired autoreactivity are eliminated. Normally, T cells are critical for germinal center formation and subsequent B cell selection. Both processes involve engagement of CD40 on B cells by T cells. This report describes how high-affinity B cells can be induced to form large germinal centers in response to (4-hydroxy-3-nitrophenyl) acetyl (NP)-Ficoll in the absence of T cells or signaling through CD40 or CD28. This requires extensive cross-linking of the B cell receptors, and a frequency of antigen-specific B cells of at least 1 in 1,000. These germinal centers abort dramatically at the time when mutated high-affinity B cells are normally selected by T cells. Thus, there is a fail-safe mechanism against autoreactivity, even in the event of thymus-independent germinal center formation.
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Linfocitos B/fisiología , Centro Germinal/fisiología , Linfocitos T/fisiología , Animales , Antígenos CD/análisis , Antígeno B7-1/análisis , Antígeno B7-2 , Antígenos CD40/análisis , Ficoll , Haptenos , Glicoproteínas de Membrana/análisis , Ratones , Ratones Desnudos , Ratones Transgénicos , Nitrofenoles , Aglutinina de Mani , Fenilacetatos , Transducción de Señal , Bazo/efectos de los fármacosRESUMEN
A subset of myeloid dendritic cells is described which is associated with the ability of splenic and lymph node plasmablasts to survive and differentiate into plasma cells. Plasmablast-associated dendritic cells (PDC) are CD11c(high), DEC-205(-) and unlike conventional dendritic cells do not associate with T cells. The following findings suggest a requirement for PDC if plasmablasts are to differentiate to plasma cells. First, when large numbers of B cells are recruited into antibody responses and plasmablasts outgrow the PDC stroma, only those associated with PDC survive and differentiate into plasma cells. Conversely, if the number of PDC is increased by ligating their CD40, more plasmablasts survive on the expanded PDC stroma and differentiate into plasma cells. Finally, in T cell-deficient mice, the plasma cells that develop atypically in the T zones in response to thymus-independent antigens are associated with ectopic PDC.
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Apoptosis/inmunología , Células Dendríticas/inmunología , Bazo/citología , Animales , Diferenciación Celular , División Celular , Supervivencia Celular , Integrina alfaXbeta2/inmunología , Ganglios Linfáticos/inmunología , Masculino , Ratones , Ratones Endogámicos C57BLRESUMEN
Protection against infection with encapsulated bacteria is mediated by IgG antibodies against the capsular polysaccharides. Production of such antibodies is impaired during infancy, when susceptibility to bacterial meningitis is greatest. Recent studies have proposed the use of anti-CD40 antibody to increase responsivenesses to polysaccharide antigens. We show here that the IgG response to a model polysaccharide antigen is greatly increased, but retains thymus-independent characteristics--switching continues to be mainly to IgG3 and neither germinal centers nor memory B cells are formed. Furthermore, anti-CD40 causes striking splenomegaly in mice, which is accompanied by dramatic cellular redistribution and proliferation of dendritic cells, macrophages, T cells and endothelium, as well as B cells. These findings raise the possibility that the anti-CD40 effect is due mainly to increased activity of accessory cells that affect plasmablast growth and differentiation rather than mimicry of T cell help.
Asunto(s)
Anticuerpos/inmunología , Antígenos CD40/inmunología , Ficoll/inmunología , Linfocitos T Colaboradores-Inductores/inmunología , Animales , Antígenos T-Independientes/inmunología , Centro Germinal/inmunología , Inmunidad Mucosa/inmunología , Cambio de Clase de Inmunoglobulina/inmunología , Inmunoglobulina G/inmunología , Memoria Inmunológica/inmunología , Masculino , Ratones , Ratones Endogámicos C57BL , Ratones Endogámicos CBA , Nitrofenoles/inmunología , Fenilacetatos , Factores de TiempoRESUMEN
Mouse mammary tumor virus has developed strategies to exploit the immune response. It requires vigorous immune stimulation to achieve efficient infection. The infected antigen-presenting cells present a viral superantigen on the cell surface which stimulates strong CD4-mediated T-cell help but CD8 T-cell responses are undetectable. Despite the high frequency of superantigen-reactive T cells, the superantigen-induced immune response is comparable to classical antigen responses in terms of T-cell priming, T-cell-B-cell collaboration as well as follicular and extra-follicular B-cell differentiation. Induction of systemic anergy is observed, similar to classical antigen responses where antigen is administered systemically but does not influence the role of the superantigen-reactive T cells in the maintenance of the chronic germinal center reaction. So far we have been unable to detect a cytotoxic T-cell response to mouse mammary tumor virus peptide antigens or to the superantigen. This might yet represent another step in the viral infection strategy.
Asunto(s)
Formación de Anticuerpos , Inmunidad Celular , Virus del Tumor Mamario del Ratón/inmunología , Infecciones por Retroviridae/inmunología , Infecciones Tumorales por Virus/inmunología , Secuencia de Aminoácidos , Animales , Células Presentadoras de Antígenos/inmunología , Antígenos Virales/inmunología , Humanos , Ratones , Datos de Secuencia Molecular , Superantígenos/inmunología , Linfocitos T/inmunología , Linfocitos T Citotóxicos/inmunología , Virosis/inmunologíaRESUMEN
Sickle cell trait patients rarely have crises. A case of co-morbidity with acute intermittent porphyria is described in which trans-mural infarction of the distal ileum secondary to red cell sickling resulted in a fatal outcome.
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Anemia de Células Falciformes/complicaciones , Infarto , Intestino Delgado/irrigación sanguínea , Porfiria Intermitente Aguda/complicaciones , Adulto , Diagnóstico Diferencial , Resultado Fatal , Humanos , Infarto/diagnóstico , Infarto/cirugía , MasculinoRESUMEN
During the primary splenic response to the T-independent type 2 (TI-2) antigen (4-hydroxy-3-nitrophenyl) acetyl (NP)-Ficoll, small numbers of antigen-specific B cells have entered S phase of the cell cycle 24 h after intraperitoneal immunization. These are distributed in all splenic compartments (T zones, marginal zones, follicles, and red pulp), indicating early proliferation induced by NP-Ficoll does not require accessory signals delivered in a particular splenic microenvironment. Subsequently B blasts accumulate selectively in the outer T zone areas, but exponential growth leading to plasma cell production occurs only in extrafollicular foci. This growth peaks after 5 days, but 20% of peak numbers of antibody-containing cells are still present 3 months after immunization and 9% of these cells are proliferating. It is unclear if these late plasmablasts are sustained by self-renewal or continued recruitment of virgin cells into the response. Unlike TD and TI-1 responses NP-specific memory cells do not accumulate in the splenic marginal zones. The level of Cgamma3 switch transcripts increases during the first 24 h of the response, but does not increase further during exponential plasmablast growth.
Asunto(s)
Antígenos T-Independientes/inmunología , Linfocitos B/inmunología , Activación de Linfocitos , Bazo/inmunología , Animales , Diferenciación Celular , Inmunización , Inmunoglobulina G/sangre , Inmunoglobulina G/clasificación , Inmunoglobulina M/sangre , Masculino , Ratones , Ratones Endogámicos C57BL , Ratas , Bazo/citologíaRESUMEN
Vav, a guanine nucleotide exchange factor for members of the Rho family of small GTPases, is activated through engagement of B and T lymphocyte antigen receptors. It is important for establishing the signaling threshold of the TCR, as mice lacking Vav display defective thymocyte selection. Here, conventional B cells are shown to develop normally in Vav-deficient mice but these mice have few B-1 B cells. The threshold for inducing B cell proliferation through BCR engagement in vitro is greater in Vav-deficient B cells. Nevertheless, in vivo the mutant mice have normal antibody responses to haptenated Ficoll. In contrast, Vav-/- mice show defective class switching to IgG and germinal center formation when immunized with haptenated protein. Interestingly, this defect is reversed in chimeras where normal T cells are present. Antigen-specific proliferation of T cells in the T zone was found to be similar in wild-type and Vav-/- mice but the induction of IL-4 mRNA and switch transcripts was specifically impaired. These results suggest that defective immunoglobulin class switching in Vav-deficient mice is attributable to compromised T cell help.
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Linfocitos B/inmunología , Proteínas de Ciclo Celular , Regulación de la Expresión Génica/inmunología , Cambio de Clase de Inmunoglobulina/genética , Cooperación Linfocítica/genética , Proteínas Proto-Oncogénicas/genética , Linfocitos T/inmunología , Animales , Activación de Linfocitos/genética , Cooperación Linfocítica/inmunología , Ratones , Ratones Noqueados , Proteínas Proto-Oncogénicas/inmunología , Proteínas Proto-Oncogénicas c-vavRESUMEN
We report 3 cases of postirradiation sarcoma that arose in the pelvis 8, 15, and 16 years after completion of external beam radiation therapy (RT) for localized adenocarcinoma of the prostate. Although such cases must be regarded as extremely rare, postirradiation sarcoma should be considered as a potential cause of pelvic pain developing after RT.
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Adenocarcinoma/radioterapia , Neoplasias Primarias Secundarias/etiología , Neoplasias Pélvicas/etiología , Neoplasias de la Próstata/radioterapia , Sarcoma/etiología , Anciano , Humanos , Masculino , Persona de Mediana Edad , Neoplasias Inducidas por Radiación/etiología , Radioterapia de Alta Energía/efectos adversosRESUMEN
By analysis with a panel of CD21 MoAbs it is shown that a large part of the soluble CD21 in human blood plasma is of the long isoform (CD21L), as judged by comparison with antigen produced by mouse L cells transfected with CD21L-cDNA and reactivity with the restricted CD21 MoAb R4/23. This is compatible with the hypothesis that soluble CD21 in the blood is mainly derived from follicular dendritic cells (FDC). Cells from a human keratinocyte cell line transfected with cDNA from the Burkitt lymphoma cell line Raji also produced soluble CD21L (sCD21L), whereas the short form of sCD21 (sCD21S) was the major component of sCD21 produced by the B lymphoblastoid cell line LICR-LON-HMy and the T cell line Jurkat. Confocal studies of FDC isolated from human tonsil revealed that CD21 was present in the cytoplasm. On gel filtration sCD21 from untreated serum has an apparent size considerably greater than the 130kD found by SDS-PAGE analysis. This may be partly accounted for by the non-globular shape of the molecule, but may also indicate, as reported by others, that in its native state sCD21 is complexed with other proteins. However, no evidence of complexing with sCD23 or C3d could be found.