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G Hoffmann-Fezer

Publications and source records attributed to G Hoffmann-Fezer.

At least 73 records · Page 4Linked to original sources
PubMed1978

Patterns of cutaneous lymphomas. Histological, enzyme cytochemical, and immunological typing of lymphoreticular proliferations in the skin.

During recent years there has been much progress in interpreting the histo- and cytomorphology of lymphoreticular proliferations by means of enzyme cytochemical (cell typing by hydrolytic enzymes) and immunological (B- and T-cell differentiation using surface markers and functional tests) methods. Applying these methods in skin biopsies from 101 patients clinically suspected of having cutaneous lymphomas, patterns of lymphoreticular infiltrations in the skin have been elaborated. Based primarily on the 'Kiel' classification, low-grade and high-grade malignant lymphomas, pseudolymphomas and 'histiocytic lymphomas' can be differentiated in the skin; however, there still remain some hitherto unclassifiable lymphoreticular proliferations. In the low-grade malignant lymphomas of the skin, mycosis fungoides, Sézary's syndrome and Pagetoid reticulosis histologically display a pattern which is typical for T-cell infiltrations in the skin, whereas most of the 'malignant reticuloses', including immunocytoma, show a B-cell pattern. Erythrocyte antibody complement rosette fixation on cryostat sections is positive only in cutaneous pseudolymphomas whereas no fixation is seen in malignant B-cell lymphomas of the skin.

B-Lymphocytes↗
PubMed1977

Immunohistochemical identification of T-and B-lymphocytes delineated by the unlabeled antibody enzyme method. II. Anatomical distribution of T- and B-cells in lymphoid organs of nude mice.

Tissue sections of the spleen, lymph nodes, and Peyer's patches were examined using an immunohistochemical demonstration of T- and B-lymphocytes in athymic homozygous nude mice possessing a known 1-5% of T-lymphocytes. Some of the few lymphocytes in the tyhmus-dependent periarteriolar zone of the spleen white pulp, the paracortex of lymph nodes and interfollicular area of Peyer's patches, were identified as T-lymphocytes. Also, singular T-lymphocytes occur in the thymus-independent marginal zone of the spleen white pulp, cortex and medulla of lymph nodes, as well as the follicular and subepithelial zones of Peyer's patches. These results indicate that the decreased numbers of T-cells in nude mice are found preferably in thymus-dependent regions, and to a smaller degree may recirculate in a similar way as in normal mice.

Animals↗
PubMed1977

Recovery of the bursa of Fabricius in chickens after cyclophosphamide treatment: a histological study.

Chickens were injected posthatching with cyclophosphamide in three different doses (total 8, 10, 11 mg). Histomorphological analysis of bursal tissue was performed up to 11 weeks of age. A probable biphasic recovery was observed in the majority of the chickens. The first phase of recovery is characterized by the appearance of solitary thioninophilic cells in reticuloepithelial follicles, followed in a few follicles by a redevelopment similar to embryonal follicular genesis. The late phase of recovery starts from week 7 on by infiltration of reticuloepithelial follicles with mature plasma cells in the manner of a peripheral lymphoid organ followed by thioninophilic lymphoid cells. The latter cells populate the follicles successively. Different transitions to normal follicles then take place. These investigations confirm observations of a reconstitution of bursal compartments starting some weeks later than the recovery of thymus, which takes place 2 weeks after cyclophosphamide treatment.

Animals↗
PubMed1977

Anatomical distribution of T and B lymphocytes identified by immunohistochemistry in the chicken spleen.

Antisera against chicken bursal and thymic lymphocytes were raised in rabbits. They were made specific for the target T or B cells by appropriat absorption and then used for immunohistochemical identification of T and B lymphocytes in tissue sections of chicken spleen, applying the unlabeled antibody enzyme method. Lymphocyte reacting with anti-chicken-thymus globulin predominated in the periarteriolar lymphatic sheaths and in the red-pulp cords. A few of these lymphocytes were localized between the periellipsoid lymphatic tissue and in germinal centers. The periellipsoid lymphocytes around the Schweigger-Seidel sheaths consisted of lymphocytes positive with anti-chicken-bursa-cell globulin. The majority of lymphocytes in the germinal centers were labeled also by anti-chicken bursa-cell globulin. Age-dependent changes in the anatomical localization of T and B lymphocytes are described between late embryonic development and an age of 2 years. The different conditions of avian and mammalian T and B cell distribution in the spleen were considered.

Aging↗
PubMed1977

Myeloid membrane markers. I. Expression of marker antigens specific for murine granulocytes and their precursor cells.

Bone marrow cells were investigated by immunoelectromicroscopy and by quantitative photometric immunoradioautography with a rabbit antiserum against murine bone marrow cells. The serum was absorbed with murine spleen, liver and thymus cells until it no longer reacted with thymocytes and lymph node cells in a quantitative complement fixation test. The antiserum stained granulopoietic but not erythropoietic or lymphopoietic cells. The density of the myeloid antigen on single cells increased with the differentiation from immature to mature granulopoietic cells. While the increase of label was statistically not significant at the level of differentiation from promyelocyte to myelocyte and metamyelocyte to band neutrophil, there was a remarkable gain of label from myeloblast to promyelocyte and from band neutrophil to segmented neutrophil. This was evident under the electron microscopy using peroxidase-labeled antibodies and could be measured quantitatively with photometric immunoradioautography using 125I-labeled antibodies.

Absorption↗
PubMed1976

Immunohistochemical identification of T- and B-lymphocytes delineated by the unlabeled antibody enzyme method. I. Anatomical distribution of theta-positive and Ig-positive cells in lymphoid organs of mice.

The unlabeled antibody enzyme method was used to delineate the anatomical distribution of lymphocytes positive with a MBtheta and a-MIg in tissue sections of thymus, spleen, lymph nodes and Peyer's patches of mice. The known T- and B-cell areas were established. Moreover, individual B-cells are detected in T-cell regions, especially in the thymus medulla, and in the periarteriolar section of spleen white pulp. Similarly, individual T-cells occur in B-cell areas, namely in the marginal zone of spleen white pulp, in the medullar cores of lymph nodes, and in germinal centers.

Animals↗
PubMed1975

[Pathogenesis of neural lesions in Marek's disease. I. Allergic skin reaction against myelin of the peripheral nerves (author's transl)].

23 chickens affected with Marek's disease were tested by the allergic skin reaction for delayed hypersensitivity against myelin and myelin preparations of peripheral nerves. 19 animals proofed to be positive in the skin test, yet there was no correlation with the intensity of the nerve affections. 4 animals with severe mononuclear neural infiltrations didn't show any allergic skin reaction. It could be demonstrated that in Marek's disease lymphocytes are sensitized against components of the peripheral myelin. Thereafter, Marek's disease stands in analogy to the Guillain-Barré syndrome of man, as well as to experimental allergic neuritis.

Animals↗
PubMed1975

[Pathogenesis of neural lesions in Marek's disease. II. Transmission of neural lesions by spleen cells from ill donors (author's transl) ].

Viable spleen lymphocytes of 13 chickens with clinical and histological signs of Marek's disease were transferred by intravenous injection to 46 chickens 4-10 days old, X-rayed 24 hours before inoculation. Histologically Marek-like neural lesions were almost regularly observed in the chickens after 6-14 days. Chickens having received destroyed spleen lymphocytes of Marek-donors were free of nerve infiltrations. There were also no neural lesions detectable within 14 days after application of pathogenic Marek's disease virus alone, or in combination with viable spleen cells from healthy donors immunized against Marek's disease. These results exclude that the formation of neural lesions 6-14 days following the spleen cell transfer is solely induced by the virus.

Animals↗