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Biomedical subjects

C Dowding

Publications and source records attributed to C Dowding.

23 records · Page 2Linked to original sources
PubMed1985

Separation of human blast progenitors from granulocytic, erythroid, megakaryocytic, and mixed colony-forming cells by "panning" on cultured marrow-derived stromal layers.

Primitive myeloid progenitor cells will adhere to stromal feeder layers of human bone-marrow-derived adherent cells grown in the presence of methylprednisolone (MP+ layers). These progenitors form colonies of blast cells on the MP+ stromal layers, but not on stromal layers grown in the absence of MP (MP- layers). The present study was designed to determine whether this failure of colony formation was caused by inability of the progenitors to adhere to the MP- layers or inability to proliferate in their presence. We also compared the capacities of the blast progenitors to adhere to MP+ and MP- stromal cells with those of mixed (GEMM-CFC), erythroid (BFU-E), megakaryocytic (Mk-CFC), and granulocyte-macrophage (GM-CFC) colony-forming cells. Incubation of bone marrow mononuclear cells with MP+ stromal layers removed 90% of the blast progenitors, but did not remove the majority of the GEMM-CFC, BFU-E, Mk-CFC, and GM-CFC; incubation of bone marrow mononuclear cells with MP- stromal layers did not remove the blast progenitors or the GEMM-CFC, BFU-E, Mk-CFC, and GM-CFC. Thus, the blast progenitors adhere to MP+ stromal feeder layers, but not to MP- stromal layers. In this respect they differ from the other more mature colony-forming cells that do not show any marked tendency to adhere to either type of stromal layer.

Bone Marrow Cells↗
PubMed1984

Chemotherapy and autografting for chronic granulocytic leukaemia in transformation: probable prolongation of survival for some patients.

Between June 1977 and July 1983 51 patients with Ph1-positive chronic granulocytic leukaemia (CGL) in transformation were treated either by chemotherapy or by chemoradiotherapy followed by autografting with haemopoietic stem cells collected from their peripheral blood at the time of diagnosis. Forty-eight patients were restored to a second chronic phase. The median duration of survival after autografting was 26 weeks (range 2-152 weeks). Twenty-one patients with relatively long durations of second chronic phase were treated again by autografting as consolidation or when transformation recurred; this selected group of patients survived longer than the 30 patients treated by autografting only once (medians 52 v. 13 weeks respectively, P less than 0.01). There was no significant influence of the patients' age, splenectomy status, type of transformation, treatment pre-autograft or number of nucleated cells autografted on the duration of survival. Three patients treated in myeloid blastic transformation were restored to partially Ph1-negative haemopoiesis. We conclude that this approach to the management of CGL in transformation can offer benefit for a minority of patients and that further chemotherapy and autografting for patients still in second chronic phase may be valuable.

Adolescent↗
PubMed1984

Increased T-lymphocyte numbers in chronic granulocytic leukemia before treatment.

We measured the numbers of B- and T-lymphocytes in the peripheral blood of 40 patients with chronic granulocytic leukemia (CGL) at different stages in the chronic or stable phase of the disease. In untreated patients and in treated patients with relatively high leukocyte counts, T-cell numbers were increased: in the majority of cases this increase involved both "helper" (OKT4+) and "suppressor" (OKT8+) cells. B-cell numbers were normal. Patients whose leukocyte counts had been restored to normal by treatment with cytotoxic drugs had normal T-cell numbers, but B-cell numbers were reduced in comparison with normal persons. We conclude that untreated CGL is usually associated with a T-cell lymphocytosis that can be reversed by chemotherapy. The excess of T-lymphocytes in the blood before treatment is probably an immunological response to the neoplastic proliferation, but the possibility that some T-lymphocytes might be involved in the malignant clone cannot be excluded.

Adolescent↗