Folia haematologica (Leipzig, Germany : 1928)最新文献

The impact of ultraviolet light on uv/vis absorption spectra of selected individual components of the cell breeding medium according to Eagle (MEM) was investigated. The strongest alterations of light absorption were detected in L-phenylalanine, L-tyrosine and L-tryptophan. Thus, the absorption behaviour of the Eagle (MEM) medium changed post radiation may be attributed to spectrophotometric alterations of absorption in aromatic amino acids. The results are discussed with regard to the effect on the surface charge of erythrocytes.

In concentrations from 2.5 x 10(3) to 480 x 10(3) ng/ml AFP is able to increase the phagocytic index and the phagocytizing percentage of human blood platelets in vitro conditions. This effect is dependent on the dose of AFP and time of incubation.

There is reported about the treatment of refractory thrombocytopenia in a 9 years old boy following the autologous bone marrow transplantation for acute lymphoblastic leukaemia. The megakaryocytes were found diminished in the bone marrow smears. Controls of the thrombocyte count and the kinetics with radioactively labeled platelets of a donor spoke in favour of immunothrombocytopenia. Threatening bleeding complications challenged the use of all treatment possibilities. The irradiation of the spleen was without any success. After the splenectomy the thrombocyte count increased slowly, but after a remarkable lag phase, however. A diminished reproduction capacity of the bone marrow graft for special cell sorts has to be taken into account in such cases. The usual cytodynamics after splenectomy cannot be expected at all.

Peripheral blood mononuclear cells of a patient with cyclic neutropenia release a high molecular weight substance (over 300,000) inhibiting normal CFU-GM cells to enter the S-phase of cell cycle. The inhibitor was released predominantly in the neutropenic phase of the disease, while in the period of normal granulocyte count the release was lower or undetectable. Also sensitivity of patient's bone marrow CFU-GM cells to similar high molecular weight inhibitor produced by ML-2 cell liner or to human placental ferritin varied within the disease cycle. CFU-GM in the normal granulocyte count period were sensitive to the inhibitors, but CFU-GM in the neutropenic phase were resistant.

The platelets of haemophilic patients produce after stimulation with thrombin (5 NIH-units) a significantly reduced amount of malondialdehyde in comparison to the platelets of healthy children of the same age. There is a positive correlation between the platelet count in citrated whole blood and malondialdehyde production in the group of healthy children, however the same correlation is negative in adults and strongly negative in haemophiliacs. Because of the 24 hour-intervals between the last substitution and investigation in the majority of haemophilic patients, the reduced MDA-production of their platelets seems to be the result of side effects of the administration of plasma fractions. On the other hand, the reduced capacity for the MDA-production of the platelets of haemophiliacs can be explained as the result of the release reaction of platelets after haemostasis activation following bleedings.

Numbers, proliferative potential, and differentiative capacity of bone marrow granulocyte-macrophage precursor cells were studied in 130 children with acute lymphoblastic leukaemia (ALL), including 77 children in an acute phase of the disease and 53 in remission. Bone marrow samples from 65 children without haematopoietic abnormalities were used as controls. The numbers of clonogenic precursors were found to be below normal in all phases of ALL, particularly during the acute period when the bone marrow was heavily infiltrated with leukaemic cells. It is shown that the decreases in the numbers and proliferative potential of the precursor cells during the acute phases was associated with the effects of leukaemic blast cells, but that in remission the observed reduction in the precursor cell pool was due to the cytostatic effect of therapy. The differentiative capacity of clonogenic granulocyte and macrophage precursors was not altered in children with ALL.

In blood donors the question arises for eventual endangering by iron deficiency. The results of this work show that ferritin determinations for blood donors will indicate a latent, in some cases a manifest iron deficiency. The examination of testing components such as PVC, MCH, Fe i. S., transferrin and transferrin saturation produced no special advantages concerning sensitivity and specificity, in terms of ferritin determination. It is indispensable, however, to know the ferritin value because the control of the Hb value prior to blood donation will usually characterize the blood donor's situation in a sufficient manner. For control purposes it is possible to use capillary or venous blood. It is only in general, but particularly in special clinical situations that you have to be aware of the blood donor's condition concerning his/her Fe-metabolism.

The systemic lupus erythematosus (SLE) and the rheumatoid arthritis (RA) as the classic autoimmune diseases exhibit a great number of autoantibodies. Some of them are anticoagulants. Besides inactivating inhibitors against single coagulation factors interfering anticoagulants are known, belonging to the group of anti-phospholipid antibodies and detected as the lupus anticoagulants or anticardiolipin antibodies. Anti-phospholipid antibodies 184 patients with SLE or RA had been checked for. An enzyme immuno assay was used for detection of the anti-cardiolipin antibodies. The relations between occurrence of the anti-cardiolipin antibodies and vascular processes as well as other immunologic parameters had been tested for clinical relevancy.

In the routine production of a factor VIII concentrate (produced by adsorption of contaminating proteins in cryoprecipitate to controlled-pore silica and concentration of the factor VIII effluent by ultrafiltration) the terminal dry-heat treatment has been replaced by pasteurization in the liquid state. High effectivity of this procedure with respect to virus inactivation was demonstrated using a variety of both lipid- and protein-enveloped model viruses, including HIV. Pair-wise quality control of dry-heated and pasteurized product revealed no significant differences, except in the composition of the formulation buffer. In a clinical study in which 17 patients with haemophilia A participated the pasteurized product was well tolerated and in vivo recovery and half-life of factor VIII were in the same (normal) range as found for the dry-heated counterpart.