Eight children with various diseases, who has frequent infections were examined for abnormalities of serum proteins and leucocyte function. Inborn or secondary defects could be recognized by the tests for chemotaxis, the intracellular killing of bacteria as well as yeast and the oxydative metabolism of the granulocytes. The defects were serum- or cell-dependent and they could be detected alone or in combination with other dysfunctions. Three children showed a reduced stimulation of the lymphocytes in addition to the impairment of chemotactic activity or fungicidal cavity.

Adolescent↗

PubMed1975

[Significance of the bone marrow stroma for regeneration after aplasia].

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Bone Marrow↗

PubMed1975

[Diagnosis and therapy of primary defects of immunity (author's transl)].

Immunological responses are divided into those mediated by humoral antibody (B-Cells) and those by cells (T-Cells). Both depend upon the activity of small lymphocytes which become thymus or bursa analogue dependent during embryonic development. Primary immundeficiencies are therefor defects of lymphocytes attributed in most cases to gene defects. Early diagnosis is the necessary prerequisit for possible treatment. Tests for assessing the cellular immune status are: skin testes and in vitro tests. Clinical syndroms are: lymphocytopenia, hypoplasia, deficiency of lymphocytes in lymphatic tissues normal cortical germinal centres. Recurrent infections with viruses, candida or pneumocystis carinii are common. Tests for assesing the humoral immune status are: measurement of immunglobulin levels in serum, isohaemagglutinins, tests for antibody formation following active immunization, in vitro tests. Clinical syndroms are: no germinal centres in lymphnodes, no plasma cells. Recurrent bacterial infections. Treatment of B-cell deficiencies: immunglobulin replacement therapy. Treatment of T-cell deficiencies by grafting of thymus transplants. Combined immune deficiencies are treated with bone marrow transplants from matched donors. For bone marrow transplantation germfree state seems to be the ideal situation to protect the patient against infection before the therapeutic maneuver and for prevention of graft versus host reaction in the posttransplantation period.

B-Lymphocytes↗

PubMed1975

Evidence for stem cell function of resting bone marrow lymphocytes identified by the complete 3H-thymidine labelling method.

Resting bone marrow lymphocytes, recongised as small lymphocytes by light microscopy, were labelled by the complete 3H-thymidine labelling technique, enriched by fractionation on a discontinuous albumin gradient and investigated for their stem cell properties by culture in diffusion chambers. Fraction 3, with the highest enrichment of labelled small lymphocytes and slight enrichment of other labelled cells (reticulum and endothelial cells), produced substantial growth, in contrast to fraction 4, with no enrichment of these cells. The number of labelled small lymphocytes per chamber in fraction 3 remained constant or tended to increase. This is assumed to be an indication of some degree of self-replication in the small lymphocyte population. Since, however, their labelling intensity decreased only slowly, it must be further concluded that part of the labelled small lymphocyte population probably remained resting. Some labelled transitional and blast cells appeared before the development of recognisable myelopoietic and erythropoietic precursors and of megakaryocytes, in agreement with the concept that small lymphocytes transfrom to transitional cells during the developmetn of normal haempopiesis.

Animals↗

PubMed1974