RESUMEN
No abstract available.
Asunto(s)
Citocinas/farmacología , Regulación de la Expresión Génica , Genes MHC Clase I , Antígenos de Histocompatibilidad Clase I/biosíntesis , Interferones/farmacología , Linfotoxina-alfa/farmacología , Modelos Genéticos , Transducción de Señal , Factor de Necrosis Tumoral alfa/farmacologíaRESUMEN
A soluble factor which augments the expression of major histocompatibility complex class I (MHC I) antigens on a number of murine tumor cell lines, has been isolated from the culture supernatants of mixed lymphocyte reaction of spleen cells derived from C57B1/6, Balb/c and Swiss mice. The factor, termed MHC-augmenting factor (MHC-AF) has been partially purified by Sephadex G-100 column chromatography and reverse phase HPLC. MHC-AF activity is associated with an 18 kDa molecule. MHC-AF activity was resistant to pH 2.0 treatment and partially purified MHC-AF preparations did not have any activity in L929 cell/vesicular stomatitis virus (VSV) interferon bioassay system. Antibodies to IFN-gamma did not block the activity of MHC-AF. These results indicate that a MHC-AF distinct from IFN-gamma, is produced by mouse spleen cells undergoing a mixed lymphocyte reaction.
Asunto(s)
Ratones , Animales , Anticuerpos/farmacología , Quimotripsina/metabolismo , Quimotripsina/química , Estudio Comparativo , Concanavalina A/farmacología , Calor , Antígenos de Histocompatibilidad Clase I/metabolismo , Antígenos de Histocompatibilidad Clase I/efectos de los fármacos , Interferón gamma/farmacología , Interferón gamma/metabolismo , Interferón gamma/inmunología , Linfocitos/fisiología , Ratones Endogámicos BALB C , Ratones Endogámicos C57BL , Proteínas/farmacología , Proteínas/metabolismo , Proteínas/aislamiento & purificación , Bazo/citología , Tripsina/metabolismo , Tripsina/química , Células Tumorales Cultivadas/inmunología , Células Tumorales Cultivadas/efectos de los fármacosRESUMEN
Mouse spleen cells activated in a mixed lymphocyte reaction release a soluble factor, which induces a significant proliferative response in fresh mouse spleen cells. This proliferation inducing factor (PIF) was found to be heat stable (90 degrees C for 45 min) and also resistant to trypsin or chymotrypsin treatment. By using a sizing HPLC column, the molecular weight of PIF appears to be 25 kDa. Mouse spleen cells treated with anti-thy-1 + complement lost Con-A induced proliferative responses but responded well to PIF. B cell depleted spleen cells obtained by negative selection panning, did not respond to PIF. These results indicate that B cells proliferated in response to PIF. Polymixin-B, which blocks the B cell proliferative response to LPS, did not inhibit PIF induced proliferation.
Asunto(s)
Ratones , Animales , Linfocitos B/fisiología , Linfocitos B/efectos de los fármacos , Médula Ósea/metabolismo , División Celular/fisiología , Cromatografía Líquida de Alta Presión , Quimotripsina/farmacología , Relación Dosis-Respuesta a Droga , Sustancias de Crecimiento/farmacología , Sustancias de Crecimiento/química , Calor , Ratones Endogámicos BALB C , Ratones Endogámicos C57BL , Peso Molecular , Polimixina B/farmacología , Desnaturalización Proteica , Bazo/metabolismo , Timo/metabolismo , Tripsina/farmacologíaRESUMEN
A case of leech in the Larynx occupying the glottic space is presented. The literature is reviewed
Asunto(s)
Humanos , Femenino , Enfermedades de la Laringe/parasitologíaRESUMEN
A rare case of bilateral retropharyngeal abscess with bilateral lymphadenitis [Tubercular] is reported along with relevant review of literature