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T Godal

Publications and source records attributed to T Godal.

At least 55 records · Page 3Linked to original sources
PubMed1987

BCG induced CD4+ cytotoxic T cells from BCG vaccinated healthy subjects: relation between cytotoxicity and suppression in vitro.

Mycobacterial antigen specific cytotoxic T cells killing antigen-pulsed antigen presenting cells (APC) were induced from peripheral blood mononuclear cells (PBMC) of BCG-vaccinated healthy subjects after activation in vitro with BCG. CD8+ depleted cells were as effective as PBMC, indicating that CD4+ cells play a dominant role in this phenomenon. CD4+ T cell clones raised against BCG also exhibited mycobacterial antigen specific cytotoxicity and suppressed BCG-driven selfproliferation. However, the same clones could either suppress or enhance the proliferation of other T cell clones from the same subject. The possible function in vivo of the cytotoxicity mediated by CD4+ T cells is discussed.

Antigens, Bacterial↗
PubMed1987

Single cell studies on the immunological marker profile of plasmacytoid T-zone cells.

Plasmacytoid T cells (PTC) are known to home to thymic (T) zones in human lymph nodes and are characterized by their abundant, concentrically layered, rough endoplasmic reticulum. These cells have been found in reactive and neoplastic conditions. Three cases of PTC lymphomas have so far been reported. All of them were complicated by a myelomonocytic leukemia leading to the assumption of a functional relationship between PTC and the myeloid system. The immunologic phenotype of PTC, as revealed on frozen tumor tissue sections, comprised the expression of CD5 (T1), CD4 (T4), and HLA-DR, but not CD8 (T8) and CD2 (T11) and suggested an affiliation to the T cell system. Extending our previous report on one of these cases we here present the first study on the immunological marker profile of suspended PTC. The employment of unfractionated or PTC-enriched tumor cell suspensions rendered possible the application of a panel of monoclonal antibodies (moAbs) on both fixed and unfixed cells and enabled us to allocate various markers either to the intracytoplasmic or surface domain of this cell type. Our results suggest that PTC from our case rest in the G0/G1 phase of the cell cycle. They express the transferrin receptor, but not the Il-2 receptor (CD25) or the nuclear antigen Ki-67. No T cell antigen was demonstrated on the surface of unfixed suspended PTC. Under these conditions only HLA-DR and a predominantly monocytic antigen (CD36/moAb 5F1) were identified. Fixed cells, however, showed a weak cytoplasmic reactivity for CD5 and two myelomonocytic antigens (CD15/moAb 1G10 and CD14/moAb My4). Our findings do not sustain positive evidence for a T cell nature of PTC. Whether their phenotypical pattern indicates terminal differentiation with concomitant loss of T cell antigens or points to a cytogenetic relationship of PTC to the myeloid system, remains speculative. Until the cytogenesis of PTC is clarified we propose the noncommitted term "plasmacytoid T-zone cells" for this elusive cell type.

Antigens, Differentiation, T-Lymphocyte↗
PubMed1987

In vitro proliferation of lymphocytes from human volunteers vaccinated with armadillo-derived, killed M. leprae.

A killed, armadillo-derived Mycobacterium leprae vaccine was examined for its ability to induce cell-mediated responsiveness in purified protein derivative (PPD)-positive volunteers residing in a nonendemic country using the lymphocyte transformation test (LTT). A marked increase in the proliferative responses to a M. leprae-soluble antigen preparation was observed in the two groups which were vaccinated with the highest doses of the vaccine, i.e., 1.5 X 10(8) and 5 X 10(8) bacilli. This increase was observed in both groups 3 months after vaccination, and persisted for the study period of 1 year. The in vitro proliferative responses to whole bacilli, of both armadillo and human origin, showed a similar but smaller increase 3 months after vaccination. Some enhancement of responses to cross-reactive antigens, such as PPD, and to unrelated antigens such as streptokinase-streptodornase, tetanus toxoid and diphtheria toxoid, was also observed. Thus, the LTT revealed that while the killed M. leprae vaccine induced a specific cell-mediated response to M. leprae, it was also responsible for a nonspecific immune-enhancement effect in healthy volunteers.

Adult↗
PubMed1986

Distinct effect of forskolin and interferon-gamma on cell proliferation and regulation of histocompatibility antigen expression in hematopoietic cells.

The adenylate cyclase activator, forskolin, was found to induce expression of class I and class II major histocompatibility complex antigens in a B precursor cell line, Reh, as well as in a B lymphoid cell line, Raji. No such effect was, however, observed when the promyelocytic cells line HL-60 was treated with either forskolin or the cAMP analogue 8-bromoadenosine cyclic monophosphate. As expected, all three cell lines showed reduced proliferation upon forskolin treatment. Forskolin induced expression of class I and class II major histocompatibility complex antigens in cell lines not affected by interferon-gamma and vice versa, indicating that cAMP is not involved in the regulation of histocompatibility antigens by interferon-gamma. We also compared the effect of interferon-gamma and 12-O-tetradecanoylphorbol 13-acetate on major histocompatibility complex class I and class II expression, and despite differences in the response on the tested cell lines, we can not at this point exclude the possibility that protein kinase C is involved in the action of interferon-gamma.

8-Bromo Cyclic Adenosine Monophosphate↗
PubMed1986

Specific chromosome markers involved with chronic T lymphocyte tumors.

In a series of 12 patients with chronic T cell tumors, 9 showed abnormalities of the long arm of chromosome #14. The most common aberration was an inversion with breakpoints in q11 and q32, which was seen in 7 patients. One patient had a translocation between chromosomes #9 and #14, with breaks in 9q34 and 14q11, and in another patient, the two long arms of chromosome #14 were fused together in q32, forming a dicentric chromosome. The results confirm earlier suggestions that rearrangements of band 14q11 are involved with T cell tumors and may be of importance for the development of the disease. Chromosome #8 aberrations were seen in seven patients, six of whom had an extra 8q in common. Abnormalities of chromosome #7 occurred in five patients, but the breaks were localized in different bands. The significance of the karyotypic changes in our present and previous series of patients is discussed, together with data from other laboratories.

Chromosome Aberrations↗
PubMed1986

Internalization and processing of antibodies to surface antigens on human B cells. Monoclonal anti-IgM antibodies are processed differently than monoclonal antibodies towards non-Ig surface receptors.

The internalization and intracellular processing of monoclonal antibody to immunoglobulin mu heavy chain (Mamu) have been investigated in two human Burkitt lymphoma cell lines (Ramos and Raji), in a human B cell lymphoma and in normal human peripheral blood B cells. In addition to the degradation of 125I-labeled Mamu to trichloroacetic acid (TCA) soluble material, a distinct pattern of larger 125I-Mamu fragments was detected in all sources of B cells tested. The particular fragmentation pattern, as revealed by sodium dodecyl sulfate-polyacrylamide gel electrophoretic analysis, involved the cleavage of both peptide bonds and disulfide bridges. This type of antibody fragmentation appeared to be a selective mechanism associated with sIgM, as no other degradation than that leading to TCA-soluble material could be detected after the internalization and degradation of radiolabeled monoclonal antibodies towards a variety of non-Ig B cell surface receptors. Three fragments of 125I-Mamu degradation were also detected in the supernatant of Ramos cells, implying that the recycling and exocytosis of certain 125I-Mamu fragments also took place.

Antibodies, Monoclonal↗
PubMed1986

T-zone lymphoma with predominance of 'plasmacytoid T-cells' associated with myelomonocytic leukaemia--a distinct clinicopathological entity.

In this paper we present a further case of a new clinicopathological entity combining a rare type of non-Hodgkin lymphoma with a myelomonocytic leukaemia. The characteristic feature of the lymphoma is massive infiltration of the T-zones of lymph nodes by plasmacytoid cells originally described by Lennert in non-specific lymphadenitis. Two lymphoma cases of this type have recently been published, by Müller-Hermelink et al. who named the cells 'plasmacytoid T-cells' (PTC), and by Prasthofer et al. These three cases have similar clinical and pathological features and appear to form a distinct clinicopathological entity. In contrast to the two previously published cases the present lymphoma also contained irregular lymphoid cells accompanying the PTC in the lymph node lesion and focally infiltrating the bone marrow. An accumulation of polytypic IgG positive plasma cells was observed in the remaining lymph node follicles. Immunohistological analysis with a range of monoclonal antibodies showed the PTC of our case to be CD5(T1)+, CD4(T4)+, CD3(T3)-, CD8(T8)-, CD2(T11)-, and CD25(TAC)-, but HLA-DR+ and transferrin receptor positive. The nature of this peculiar lymphoid lesion and its relationship to myelomonocytic leukaemia are discussed.

Aged↗
PubMed1986

Mycobacterium bovis BCG-induced human T-cell clones from BCG-vaccinated healthy subjects: antigen specificity and lymphokine production.

A total of 121 human T-cell clones were raised from nine Mycobacterium bovis BCG-vaccinated healthy individuals. Three clones were autoreactive, 74 responded to BCG in the presence of antigen-presenting cells, and the others required in addition exogenous interleukin 2. Only one clone was CD8+ CD4-, and the rest were CD4+ CD8-. Testing with a panel of mycobacteria suggested that the clones were recognizing epitopes of varied specificity. Out of 44 clones tested, 15 were specific to BCG and Mycobacterium tuberculosis, 22 showed limited cross-reactivity, and 8 were broadly cross-reactive. None of the 22 BCG responder clones could differentiate between Danish, French, Prague, and Moreau strains of BCG. BCG and M. tuberculosis H37Rv also paralleled very closely; however, 6 of 18 BCG- and M. tuberculosis H37Rv-responding clones did not proliferate to Mycobacterium africanum. BCG- and M. tuberculosis H37Rv-specific as well as cross-reactive T-cell clones could be induced to produce interleukin 2, gamma interferon, and granulocyte-macrophage colony-stimulating factor activity.

BCG Vaccine↗
PubMed1986

Induction of delayed-type hypersensitivity in human volunteers immunized with a candidate leprosy vaccine consisting of killed Mycobacterium leprae.

A killed armadillo-derived Mycobacterium leprae vaccine was examined for its ability to induce a delayed-type hypersensitivity (DTH) response in purified protein derivative (PPD)-positive human volunteers living in a leprosy non-endemic country. Four groups of individuals aged between 23 and 28 years were given 1.5 x 10(7), 5 x 10(7), 1.5 x 10(8) and 5 x 10(8)M. leprae intradermally. A marked increase in reactivity to the M. leprae-derived skin test antigen (MLSA) was observed in the vaccinated groups receiving the three highest doses of vaccine while there was very little change observed in their PPD reactivity. No unacceptable side-effects attributable to the vaccine were observed. The killed armadillo-derived M. leprae vaccine thus appears to be able to induce a DTH response in man at doses which do not cause unacceptable side-effects.

Adult↗
PubMed1985

Amplification of the c-myc oncogene in human plasma-cell leukemia.

We have examined primary leukemia cells from multiple myeloma and plasma-cell leukemia patients for rearrangement, amplification and expression of c-myc oncogene. No rearrangement or detectable amplification of the c-myc could be found in 21 cases of multiple myeloma. In contrast, 2/3 cases of plasma-cell leukemia showed amplification of the oncogene with concomitant higher level of expression.

Cell Line↗
PubMed1985

Antibodies to surface IgM and IgD increase the expression of various class II antigens on human B cells.

Antibodies to surface IgM and IgD were found to induce increased expression of class II antigens on normal and neoplastic human B cells within 24 h of stimulation. Antigens associated with different class II sub-locus genes (DC, DR and SB) were all found to be increased as determined by monoclonal antibodies (Leu-10 and B 3/4 for DC, D 1/12 for DR and MHM4 for SB-associated antigens). The increased expression of class II antigens was selective as anti-immunoglobulins failed to increase expression of other surface antigens such as B1 and beta 2-microglobulin. The effect of anti-mu and anti-delta could be blocked specifically by corresponding myeloma proteins suggesting that antibodies to surface IgM and IgD, respectively, were responsible for the effect observed. Moreover, antibodies to another surface antigen (B1) failed to induce such changes. Increased class II antigen expression appeared to be dependent on protein synthesis, and early changes in ion fluxes, but could not be elicited by membrane depolarization as reported in murine systems.

Antibodies, Anti-Idiotypic↗
PubMed1985

The role of interleukin-2 (IL-2) in the specific unresponsiveness of lepromatous leprosy to Mycobacterium leprae: studies in vitro and in vivo.

The role of IL-2 in the immunological deficiency of lepromatous leprosy patients towards Mycobacterium leprae have been studied further. After initial stimulation with M. leprae + IL-2, lepromatous lymphocytes could be restimulated with M. leprae alone. The specificity of the responses obtained varied. Some patients gave a stronger response to BCG as compared to M. leprae, while in others a stronger response to M. leprae as compared to BCG was obtained. Studies of the composition of lymphocytes in dermal infiltrates subsequent to injection of killed M. leprae revealed that in both tuberculoid and lepromatous patients, early accumulation of cell staining for both IL-2 receptor and IL-2 were seen. However, with time IL-2 receptor and IL-2 staining lymphocytes diminished in lepromatous infiltrates, while these were maintained in tuberculoid lesions.

Humans↗