RESUMO
By microscopical observation and using an original morphometric method, we analyzed on histological sections the rate of lung colony formation after the intravenous injection into the mouse of B16 melanoma cells previously cultivated in vitro as aggregates. After the injection of B16 pure spheroids, superficial lung colonies were more numerous than internal lung colonies. After the injection of mixed spheroids (B16 + 3T3 fibroblasts), the size of colony sections was increased. Addition of laminin to pure or mixed spheroids decreased the size of colony sections but increased the number of internal lung colonies.
Assuntos
Células 3T3/fisiologia , Laminina/farmacologia , Neoplasias Pulmonares/secundário , Melanoma Experimental/secundário , Animais , Comunicação Celular , Divisão Celular , Técnicas de Cultura/métodos , Neoplasias Pulmonares/irrigação sanguínea , Neoplasias Pulmonares/patologia , Melanoma Experimental/irrigação sanguínea , Melanoma Experimental/patologia , Camundongos , Invasividade Neoplásica , Transplante de Neoplasias , Neovascularização Patológica , Células Tumorais Cultivadas/efeitos dos fármacos , Células Tumorais Cultivadas/patologia , Células Tumorais Cultivadas/transplanteRESUMO
Receptors for the Fc part of IgG on polymorphonuclear cells (FcR) of patients with rheumatoid arthritis (RA), Felty's syndrome (FS) and healthy controls (HC) were studied by means of a rosetting technique with rabbit IgG coated ox erythrocytes. When cold isolated polymorphonuclear cells (PMN) were incubated at room temperature the percentage of rosette forming PMN (RF-PMN) from HC was more than twice that measured directly after isolation at 4 degrees C. The same phenomenon was observed for PMN from patients with RA although the RF-PMN increased by only 1/3. In contrast warming of PMN from patients with FS did not influence the RF-PMN. The presence of surface bound immunoglobulins and intracytoplasmic immunoglobulins was measured by immunofluorescence and appeared to be inversely related to the RF-PMN. A good correlation between the results of the C1q binding assay (C1qBA) and the immunofluorescence score was observed but no correlation existed between the C1qBA and the RF-PMN. These results indicate that the number of PMN expressing FcR in patients with RA and FS is decreased presumably because of the phagocytosis of immune complex like material. The decrease in the availability of FcR may influence the functions of the PMN.
