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  • 1
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Peritoneal exudate cells (PEC) of DBA/2 mice, after 7 days ofin vitro preculture and consisting of virtually 100 per cent macrophages, were able to support the replication of Herpes Simplex Virus type 1 strain WAL (HSV). Using a standard medium based on Dulbecco's Modified Eagle Medium (D-MEM), no virus replication was observed in freshly isolated PEC. However a medium based on RPMI1640 consistently yielded higher virus titres in precultured PEC than the D-MEM medium, and also allowed virus replication in freshly isolated PEC. Macrophages derived from the spleens or the bone marrow, and precultured in the same way as PEC represented a highly pure population and were permissive for infection with HSV. Titres of about 106 PFU HSV were observed in PEC 48 hours after infection with 103 or 106 PFU. However, whereas a complete destruction of the cell monolayer was observed 24 hours after infection with 106 PFU, complete cytopathogenicity in PEC infected with 103 PFU required at least twice this time. In the latter situation, plaque formation was observed 24 hours after infection. PEC of different strains of mice were compared. Of these, PEC of all mice that are susceptible to HSV infectionin vivo replicated HSV to the same degree as PEC of DBA/2 mice, whereas PEC of resistant C57 BL/6 and C3H/HeJ mice produced 1000 fold lower titres of viral progeny. Whereas the number of infectious centres were equal in PEC of DBA/2 and C57 BL/6 mice, the plaques observed after infection of confluent PEC with a low MOI were considerable smaller in cells from C57 BL/6 mice. Furthermore, significantly higher titres of interferon were measured in the supernatants of HSV-infected C57BL/6 macrophages than in those of DBA/2 macrophages, and the former were made fully susceptible by thein vitro addition of an anti-interferon serum.
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  • 2
    ISSN: 1432-0584
    Keywords: Acute lymphoblastic leukemia BCR-ABL rearrangment ; Minimal residual diasease Polymerase chain reaction ; Autologous BMT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Residual leukemic cells are detectable at frequencies as low as 1 in 106 normal cells in patients with Philadelphia chromosome/BCR-ABL-positive leukemias in complete remission (CR) using reverse-transcriptase polymerase chain reaction (RT-PCR) with specific nested primers. The level of minimal residual disease (MRD) in the bone marrow (BM) and the peripheral blood (PB) may favor one of the two as the source for an autologous graft. In order to quantify MRD with RT-PCR we analyzed patients ficolled cells after limiting logarithmic dilutions in normal ficolled buffy-coat cells. In six patients with BCR-ABL-pos ALL who were in CR by conventional criteria (5 in CR1 and 1 in CR2), we studied a total of nine paired BM and PB samples prior to scheduled ABMT. A positive RT-PCR signals was detectable in all samples up to dilutions ranging from 1∶101 to 1∶103 in PB, and at higher titers ranging from 1∶103 to 1∶105 in the BM. The BM titers exceeded the corresponding PB titers in all nine sample pairs by at least 1 log. The mean difference was 1.55 log (geometric mean,n=9) and is statistically significant (p〈0.03). We conclude that residual leukemia in BCR-ABL-positive ALL preferentially locates in the BM compartment, and we assume that PB may yield autologous grafts with significantly less leukemic contamination.
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  • 3
    ISSN: 1432-0584
    Keywords: Amifostine ; Myelodysplastic syndrome ; Refractory anemia ; Tumor necrosis factor alpha
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: 2 /day three times per week followed by a 2-week interval. Since tumor necrosis factor (TNF)α is a main suppressive cytokine for hematopoiesis in RA patients, serum samples for analyzing endogenous levels of TNFα were collected prior to the study and after four treatment cycles. In three patients (21%), reduced transfusion requirement with prolongation of the transfusion interval from 4 weeks to 8 weeks (two patients) and 4 weeks to 6 weeks was seen. An increase in ANC from 400/μl to 2600/μl and 200/μl to 3400/μl was observed in two patients. Platelets increased from 129,000/μl to 277,000/μl in an additional patient. In one patient, disease progression from RA to RAEB was observed. Serum TNFα levels were increased in MDS patients compared with normal controls (18.8 pg/ml vs 9.1 pg/ml), and there was no change during the treatment with amifostine (17.5 pg/ml). In conclusion, treatment with amifostine as a single agent was of limited benefit in patients with RA. The serum TNFα levels were unchanged during treatment with amifostine in RA patients.
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