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H Moll

Publications and source records attributed to H Moll.

At least 19 recordsLinked to original sources
PubMed1992

Identification of 27-oxo-octacosanoic acid and heptacosane-1,27-dioic acid in Legionella pneumophila.

Two long-chain fatty acids, 27-oxo-octacosanoic acid (28:0(27-oxo)) and heptacosane-1,27-dioic acid (27:0-dioic) were identified for the first time in phenol-chloroform-petroleum ether extracts of Legionella pneumophila, indicating that they are constituents of lipopolysaccharide. The fatty acids were characterised by combined gas-liquid chromatography/mass spectrometry and proton nuclear magnetic resonance spectroscopy. Moreover, minor amounts of 29-oxo-triacontanoic (30:0(29-oxo)) acid and nonacosane-1,29-dioic acid (29:0-dioic) as well as 27-hydroxy-octacosanoic acid (28:0(27-OH)) were present in the phenol-chloroform-petroleum ether extract.

Dicarboxylic Acids↗
PubMed1992

Murine epidermal Langerhans cells are potent stimulators of an antigen-specific T cell response to Leishmania major, the cause of cutaneous leishmaniasis.

Cutaneous leishmaniasis is initiated by the bite of an infected sandfly and inoculation of Leishmania major parasites into the mammalian skin. Macrophages are known to play a central role in the course of infection because they are the prime host cells and function as antigen-presenting cells (APC) for induction of the cell-mediated immune response. However, in addition to macrophages in the dermis, the skin contains epidermal Langerhans cells (LC) which can present antigen (Ag) to T cells. Therefore, using a murine model of cutaneous leishmaniasis, we analyzed the ability of epidermal cells to induce a T cell response to L.major. The results demonstrated that freshly isolated LC, but not cultured LC, are highly active in presenting L.major Ag in vitro to T cells from primed mice and to a L.major-specific T cell clone. Furthermore, freshly isolated LC had the ability to retain L.major Ag in immunogenic form for at least 2 days. Their efficiency was much greater than that of irradiated spleen cells, a standard population of APC. LC stimulated both T cell proliferation and production of the lymphokines interleukin (IL)-2 and IL-4. The response was Ag specific and could be induced by lysate of L.major parasites and by live organisms. The data suggest that epidermal LC are important APC in cutaneous leishmaniasis. They may perform a critical function by capturing L.major Ag in the skin and presenting it either to quiescent T cells circulating through the draining lymph node or locally to T effector cells infiltrating the cutaneous lesion.

Animals↗
PubMed1991

Analysis of primary T cell responses to intact and fractionated microbial pathogens.

Freshly isolated human T lymphocytes were tested for their response to mycobacteria, mycobacterial lysates, 2 dimensional (2D) PAGE separated mycobacterial lysates, leishmania and defined leishmanial antigen preparations. While gamma delta T cells proliferated vigorously in the presence of mycobacteria and mycobacteria derived lysates, a significant stimulation from 2 D gel separated lysates was not detected. In addition gamma delta T cells failed to respond towards leishmania or leishmanial components. In the alpha beta T cell compartment some donors, presumably according to their state of immunity against mycobacteria, responded to mycobacteria, mycobacterial lysates and 2 D gel separated mycobacterial lysates. Neither freshly isolated gamma delta T cells nor alpha beta T cells from naive donors did mount a significant immune response against leishmania.

Animals↗
PubMed1991

Lymphocytes play the music but the macrophage calls the tune.

Researchers interested in immunological aspects of bacterial, fungal, protozoan and helminthic infection are too often kept apart by artificial subject boundaries. These barriers were temporarily breached by a recent workshop* in which the complex interplay between microbes and their mammalian hosts were examined from a global viewpoint. The role of T-cell subsets and their products came under close scrutiny but the most forceful image was that of the macrophage. As host for infective agents, as modulator of specific immune activity and as ultimate mediator of the host response, the macrophage plays a virtuoso's role in the host-parasite drama.

Animals↗
PubMed1991

Expression of T-cell-associated serine proteinase 1 during murine Leishmania major infection correlates with susceptibility to disease.

The expression of T-cell-associated serine proteinase 1 (MTSP-1) in vivo during Leishmania major infection was analyzed in genetically resistant C57BL/6 mice and in genetically susceptible BALB/c mice. Using a monoclonal antibody as well as an RNA probe specific for MTSP-1 to stain tissue sections, we found T cells expressing MTSP-1 in skin lesions and spleens of mice of both strains. In skin lesions, MTSP-1-positive T cells could be detected as early as 3 days after infection. Most importantly, the frequency of T cells expressing MTSP-1 was significantly higher in susceptible BALB/c mice than in resistant C57BL/6 mice. These findings suggest that MTSP-1 is associated with disease-promoting T cells and that it may be an effector molecule involved in the pathogenesis of cutaneous leishmaniasis.

Animals↗
PubMed1991

T-cell reactivity to purified lipophosphoglycan from Leishmania major: a model for analysis of the cellular immune response to microbial carbohydrates.

The major macromolecule on the surface of Leishmania major promastigotes is a lipophosphoglycan (LPG). This glycoconjugate plays a key role in determining infectivity and survival of parasites in the mammalian host cell. In addition, L. major LPG is able to induce a host-protective immune response. In this article, we summarise the evidence for recognition of highly purified LPG by T cells and we discuss the potential mechanisms of T-cell stimulation by this non-protein antigen.

Animals↗
PubMed1990

Tumor necrosis factor-alpha in combination with interferon-gamma, but not with interleukin 4 activates murine macrophages for elimination of Leishmania major amastigotes.

We have previously shown that during an infection with Leishmania major, susceptible BALB/c mice, as opposed to mice of a resistant strain (C57BL/6), are primed by lipopolysaccharide for the production of high levels of tumor necrosis factor-alpha (TNF-alpha) which is known to be a potent macrophage (M phi) stimulator in other parasitic diseases. In the present study we investigated whether TNF-alpha activates M phi for killing of L. major parasites. In the absence of interferon-gamma (IFN-gamma) or lipopolysaccharide, TNF-alpha (0.025-25,000 U/ml) failed to activate peritoneal exudate M phi from BALB/c mice for killing of L. major amastigotes. In the presence of suboptimal doses of IFN-gamma (5 or 10 U/ml), however, TNF-alpha mediated a rapid elimination of intracellular parasites, which was highly significant compared to IFN-gamma alone. The combination of TNF with interleukin 4, in contrast, was inactive in this respect and allowed survival of intracellular parasites. From these data we conclude that the presence of IFN-gamma is crucial for TNF-alpha-mediated killing of L. major parasites by M phi. Disease progression in susceptible mice therefore seems to be a consequence of a deficiency of IFN-gamma and a predominance of interleukin 4 rather than the result of an excess amount of TNF-alpha.

Animals↗
PubMed1990

Resistance to murine cutaneous leishmaniasis is mediated by TH1 cells, but disease-promoting CD4+ cells are different from TH2 cells.

A limiting dilution system has been used for quantitative analysis of antigen-reactive T cells producing interleukin (IL)2, IL4 and interferon (IFN)-gamma in the course of murine infection with Leishmania major. The precursor frequencies of CD4+ cells with the potential for production of IFN-gamma, which has been associated with TH1 cells, are much higher in resistant than in susceptible mice, whereas the reverse is found for CD4+ cells secreting IL4 which have been classified as TH2 cells. Our results allow a better understanding of the relative contribution of these cell types at various stages of disease and can be summarized as follows: (a) secretion of IL4 can be demonstrated in short-term clonal cultures of CD4+ cells from L. major-infected mice, (b) CD4+ cells releasing IL2, suggested to be a characteristic of TH1 cells that predominate in resistant mice, can also be detected in susceptible mice at any time of infection, (c) both IL2 and IL4 are released by the progeny of individual T cells from susceptible mice and (d) the kinetics of precursor frequencies in genetically susceptible mice protected against the disease by prophylactic treatment are different from those of congenitally resistant mice, thus indicating that the development of lymphokine-producing T cells and the establishment of protective immunity may be regulated differently in those mice. The data suggest that resistance to disease is correlated with the presence of IFN-gamma-producing TH1 cells, while susceptibility is associated with CD4+ cells that do not segregate into the TH1 or TH2 subset but display an overlapping pattern of lymphokine activities.

Animals↗
PubMed1990

Production of tumour necrosis factor during murine cutaneous leishmaniasis.

We have assessed the role of tumour necrosis factor-alpha (TNF) during cutaneous leishmaniasis and demonstrated that significant levels of TNF were released by spleen cells from infected mice after in vitro restimulation with Leishmania major promastigotes. Spleen cells from both genetically resistant and genetically susceptible mice were equally capable of producing TNF. After challenge with bacterial endotoxin, TNF activity could also be demonstrated in the serum of L. major-infected mice and the titres correlated with the course of cutaneous disease in susceptible and resistant mice. TNF did not exert a direct leishmanicidal effect in vitro. Furthermore, our study indicated that macrophages are the source of L. major-induced TNF activity and that its elicitation is dependent on the presence of T cells. These findings suggest that TNF acts in concert with other cytokines produced during L. major infection and that its role depends on the composition of T cell subsets and cytokines present.

Animals↗
PubMed1990

A reliable method for simultaneous demonstration of two antigens using a novel combination of immunogold-silver staining and immunoenzymatic labeling.

We have developed a reliable and sensitive immunohistochemical staining technique which allows the simultaneous demonstration of two different antigens expressed in or on the same cell (referred to as mixed labeling), together with the evaluation of the general histopathological appearance of the tissue. The staining procedure combines a three-step (streptavidin-biotin) immunogold-silver staining (IGSS) with a three-step immunoenzymatic labeling. For this purpose, we investigated the compatibility of IGSS with various substrates of peroxidase or alkaline phosphatase (AP). Highly reliable and discernible mixed labeling was achieved only after initial labeling with IGSS followed by AP labeling using the substrates naphthol AS-MX phosphate/Fast Blue or naphthol AS-BI phosphate/New Fuchsin, respectively. To ensure utmost specificity, we applied FITC-conjugated mouse monoclonal antibodies and rabbit anti-FITC immunoglobulins visualized by AP-labeled immunoglobulins and the respective substrate in a final step. This novel approach provides an excellent means for demonstration of immunocompetent cells and unequivocal determination of the percentage of specific cell subsets in infiltrated tissue. The advantages of this method, as compared with double immunofluorescence or double immunoenzymatic labeling, were investigated and are discussed.

Antibodies, Anti-Idiotypic↗
PubMed1989

A phosphodiester bridge between two arabinose residues as a structural element of an extracellular glycoprotein of Volvox carteri.

The sulphated glycoprotein SSG 185 is the monomeric precursor of a highly aggregated structural element in the extracellular matrix of the multicellular green alga Volvox carteri. A phosphodiester of arabinose was isolated from a saccharide fragment of SSG 185. The structure of this phosphodiester was investigated by methylation analysis, 13C-NMR, photometric methods and enzymatic assays and identified as D-Araiota-5-phospho-5-D-Araiota. The function of this phosphodiester bridge as a crosslink of different carbohydrate chains in SSG 185 is discussed.

Arabinose↗
PubMed1989

L3T4+ T cells promoting susceptibility to murine cutaneous leishmaniasis express the surface marker Ly-24 (Pgp-1).

In a murine model of cutaneous leishmaniasis, the importance of T cell-dependent immunity has been documented by the susceptibility to parasite infection of athymic nude mice of both genetically resistant and genetically susceptible strains. T lymphocytes from uninfected mice have the capacity to promote resistance to Leishmania major infection in nude recipients, whereas T cells from mice chronically infected with L. major not only fail to mediate protection, but totally abrogate the host-protective effect of normal mouse lymphocytes. Both these effects are mediated by T cells which have the phenotype L3T4+Ly-2-. To discriminate between the two activities, we have tried to separate the L3T4+ population on the basis of additional cell surface markers and we have found that peripheral L3T4+ lymphocytes could be subdivided according to their expression of the Ly-24 (Pgp-1) surface marker. In adoptive transfer experiments, both the Ly-24+ and the Ly-24- subset of L3T4+ cells from uninfected mice had the capacity to mediate resistance to infection with L. major. However, disease-promoting activity was only found in the L3T4+Ly-24+ and not in the L3T4+Ly-24- subset of cells from mice with chronic cutaneous disease. Moreover, Ly-24 expression was strongly increased in lymphocytes from chronically infected mice and in vitro limiting dilution analysis confirmed that the vast majority of L. major-reactive T cells was L3T4+Ly-24+. In genetically susceptible mice with chronic cutaneous leishmaniasis, Ly-24 therefore appears to be a marker for lymphocytes with the capacity to abrogate resistance to disease, these cells being activated and expanding in the course of progressive L. major infection. Ly-24 expression is a useful tool for phenotypic identification and selective enrichment of antigen-activated and possibly memory T cells. It may facilitate the isolation of L. major-specific T cell clones with defined activities.

Animals↗
PubMed1989

Monoclonal antibodies reacting with Schistosoma japonicum eggs and their target epitopes.

Ten monoclonal antibodies (McAbs) raised to Schistosoma japonicum eggs could be assigned using several serological and immunochemical techniques to 3 groups. The McAbs, termed A, B and C-McAbs, apparently recognize carbohydrate epitopes that can be located on the same antigen molecule. The antibodies, generally of IgM isotype, are idiotypically related. They are distinct from another IgM McAb (Group D-McAb) the carbohydrate target epitope of which can also be associated with the epitopes of A, B and C-McAbs. The McAbs produce large vacuolated bleb reactions in the circumoval precipitin test (COPT) and target epitopes have different representations in various life cycle stages such as immature and mature eggs, male and female worms (including S. mansoni). Antigens affinity purified on columns containing A, B, C and D-McAbs stimulate proliferation of T cells from egg-sensitized mice and elicit DTH reactions in such mice. This raises the possibility that the target antigens of these carbohydrate-reactive monoclonal antibodies are immunopathologic and involved in egg-induced granuloma formation.

Animals↗
PubMed1989

Evidence of T-cell recognition in mice of a purified lipophosphoglycan from Leishmania major.

We have previously reported that a Leishmania major lipophosphoglycan (LPG), given with killed Corynebacterium parvum as an adjuvant, can vaccinate mice against cutaneous leishmaniasis. In order to analyze whether T cells are able to recognize this important parasite antigen, we have studied both humoral and cellular immune responses to L. major LPG that had been isolated from promastigotes by sequential solvent extraction and hydrophobic chromatography. The data show that immunization of mice with highly purified LPG induced an increase in frequency of L. major-reactive T cells and the production of immunoglobulin G antibodies to LPG. Furthermore, genetically resistant mice infected with L. major were able to develop a specific delayed-type hypersensitivity response in the ear to L. major LPG. These findings strongly suggest that T cells can recognize and respond to glycolipid antigens, in this case a host-protective Leishmania LPG, even though such antigens appear not to be potent T-cell stimulators in mice.

Animals↗