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Biomedical subjects

L B Vogler

Publications and source records attributed to L B Vogler.

33 records · Page 2Linked to original sources
PubMed1979

Studies on the clonal origin of multiple myeloma. Use of individually specific (idiotype) antibodies to trace the oncogenic event to its earliest point of expression in B-cell differentiation.

IgA myeloma proteins of kappa- and lambda-types were isolated from two patients. These were used to produce and purify anti-idiotype antibodies of both broad (myeloma-related) and narrow (individual myeloma) specificities. The anti-idiotype antibodies were conjugated with fluorochromes and used as immunofluorescent probes to trace in the patients clonal expansion at different levels of B-cell differentiation. Our results (a) confirm that B lymphocyte precursors in IgA plasma-cell myelomas are involved in the malignant process, (b) show that B lymphocytes of the malignant clone include those expressing each of the major heavy-chain isotypes, mu, delta, gamma, and alpha, and (c) provide strong circumstantial evidence that pre-B-cell members of the malignant clone are also increased in frequency. T cells expressing idiotypic determinants were not detected. These findings argue that the initial oncogenic event may occur in a B-stem cell and is not influenced through stimulation by antigen. An interesting association was the increased frequency of related clones of B lymphocytes as detected by their reactivity with anti-idiotype antibodies of broad specificity. Neither plasma cell nor pre-B-cell members of these related clones were increased in frequency. Anti-idiotype antibodies or helper T cells reactive with myeloma-related idiotypes could be responsible for this phenomenon. We discuss other implications of these findings and speculate that all of the various phenotypes of B-lineage malignancies may result from oncogenic processes affecting stem cell targets.

Antibodies, Neoplasm↗
PubMed1979

Philadelphia-chromosome-positive pre-B-cell leukemia presenting as blast crisis of chronic myelogenous leukemia.

Cytogenetic studies of chronic myelogenous leukemia (CML) have shown that the majority of hemopoietic cells originate from pluripotential stem cells affected in this disease. Evidence that lymphocytes are also progeny of these stem cells, however, has been indirect. Philadelphia-chromosome-positive leukemic blasts from a 4 10/12-yr-old boy with CML in blast crisis had features characteristic of pre-B leukemic cells, including expression of cytoplasmic IgM and absence of surface immunoglobulin. Additional immunologic, enzymatic, and pharmacologic characterization of these cells supported their pre-B-cell phenotype. Together, these features provide direct evidence for CML stem cell ancestry to lymphocytes of the B-cell lineage.

B-Lymphocytes↗
PubMed1979

Recurrent meningococcal meningitis with absence of the sixth component of complement: an evaluation of underlying immunologic mechanisms.

A 51/2-year-old black girl with recurrent meningococcal meningitis and absence of the sixth component of complement (C6) is reported. To explore the pathogenesis of recurrent neisserial infections in C6 deficiency, a detailed analysis of her immune competence was conducted. Her serum had normal chemotactic, opsonic, alternative complement pathway, and specific antibody activity, but lacked complement-mediated bacteriolytic activity. In addition, her C6-deficient serum was indistinguishable from normal serum in a complement-dependent assay of phagocyte bactericidal activity. Absent bacteriolysis remains the only consistent defect associated with recurrent neisserial infections and absence of one of the late-acting complement components.

Blood Bactericidal Activity↗
PubMed1978

Pre-B-cell leukemia. A new phenotype of childhood lymphoblastic leukemia.

Large lymphoid cells containing small amounts of cytoplasmic IgM (clgM) but undetectable surface immunoglobulin (slg) have recently been recognized as precursors of B lymphocytes. They are a small, rapidly dividing pool of normal marrow lymphoblasts. Since lymphoblasts in most childhood acute lymphoblastic leukemias lack slg and other conventional B-lymphocyte and T-lymphocyte markers, we examined the possibility that some leukemias represent "pre-B"-cell neoplasms. In four of 22 consecutive patients, leukemic cells had the clgM+.slg- phenotype of pre-B cells. These patients' cells shared "common acute-lymphoblastic-leukemia" antigens and "B-cell" alloantigens, but differed in expression of several developmental features characteristic of the B-cell line. Pre-B-cell leukemias were readily responsive to chemotherapy. We conclude that a distinct subpopulation of previously unclassified leukemias reflects oncogenic transformation at the earliest recognizable stage in differentiation along the B-cell axis.

Adolescent↗
PubMed1978

A new B cell differentiation antigen (BDA) on normal and leukemic human B lymphocytes that is distinct from known DR (Ia-like) antigens.

A newly defined human B cell differentiation antigen, designated as BDA, has been defined and partially characterized. BDA is expressed on normal human B cells and lymphocytic leukemia cells at all stages of known differentiation (pre-B cells to plasma cells). It is distinct from DR (Ia-like) determinants and other known B cell surface constituents.

Animals↗
PubMed1978

B lymphocyte precursors in human bone marrow: an analysis of normal individuals and patients with antibody-deficiency states.

Lymphoid cells containing cytoplasmic IgM but lacking stable surface IgM are believed to be the direct precursors of B lymphocytes. We have characterized these pre-B cells in the bone marrow of normal individuals and patients with a variety of immunoglobulin deficiencies or hematologic disorders by using immunofluorescence and autoradiography. Pre-B cells comprised 5.8 +/- 5.7% of lymphoid cells in normal bone marrow. Eleven patients with infantile X-linked agammaglobulinemia (X-LA) lacked B lymphocytes but had a normal frequency (3.8 +/- 3.6%) of bone marrow pre-B cells. A smaller proportion of marrow pre-B cells from patients with X-LA were engaged in spontaneous DNA synthesis than was found for normal controls. In individuals other than the group with X-LA, the number of circulating B cells was positively correlated with the frequency of marrow pre-B cells. These results indicate that patients with X-LA have a defect in maturation of pre-B cells, and suggest that some patients with acquired B lymphocyte deficiency may have lost the capacity to generate pre-B cells from stem cells.

B-Lymphocytes↗
PubMed1976

Reye's syndrome in a neonate.

This case substantiates the fact that Reye's syndrome can occur in newborns. The clinical features appear to be slightly different in the neonate, in that respiratory distress was the presenting sign in this case and in the one other reported case in a newborn, with no mild preceding illness or vomiting. Thus, Reye's syndrome must be considered when a newborn presents with respiratory distress and evidence of central nervous system and hepatic involvement.

Female↗
PubMedDate not supplied

Spontaneous and interferon resistant natural killer cell anergy in AIDS.

The acquired immunodeficiency syndrome (AIDS) is characterized by severe unrelenting opportunistic infections and/or Kaposi's sarcoma associated with a dysfunction of cell mediated immune responses. In addition to cutaneous anergy and inversion of T-helper/inducer to T-suppressor cell ratios usually observed in AIDS, we have observed in three AIDS cases with multiple opportunistic infections that spontaneous and interferon (IFN) stimulated natural killer (NK) cell activity against K-562 cells is absent or severely depressed as compared to controls. Spontaneous and IFN stimulated NK cell activity in promiscuous male homosexual controls was similar to that observed in heterosexual controls. The control subjects had T-helper:T-suppressor ratios ranging from 1.1 to 2.4 in contrast to the AIDS subjects who had typical inverted ratios of T-cells ranging from 0.17 to 0.54. HNK-1, a monoclonal antibody that identifies NK and antibody-dependent cytotoxic cells, marked 3-22% of peripheral blood lymphocytes from AIDS patients in comparison to 8-38% of lymphocytes from controls. A larger series will be required in order to ascertain the true incidence of NK cell anergy in AIDS and whether or not subgroups exist based on the association of Kaposi's sarcoma in the disease process.

Acquired Immunodeficiency Syndrome↗