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Biomedical subjects

C Hammer

Publications and source records attributed to C Hammer.

At least 181 records · Page 10Linked to original sources
PubMed1990

A comparison of class II antigenicity of human tracheal allografts stored in cialit and in merthiolate.

This report deals with some of the immunological aspects of the transplantation and preservation of human tracheal grafts. The immunological behavior of the transplanted graft depends largely on the interaction of the preservatives with the tissue proteins. Using monoclonal antibodies and the immunoperoxidase staining technique we have investigated the effect of Merthiolate, Cialit, formaldehyde/Merthiolate, and formaldehyde/Cialit preservation techniques on monomorphic determinants of class II transplantation antigens in human tracheal allografts. Unpreserved grafts were found to express class II antigens. These antigens were totally destroyed after 7 days in formaldehyde and 42 days in Cialit and Merthiolate. Preservation in Cialit and Merthiolate showed a gradual disintegration of the histological structures. In contrast, buffered formaldehyde did not appear to alter the histological structure of the tracheal graft. Irrespective of the mode of preservation, the cartilaginous tissue appeared to persist virtually unaffected. No essential differences were observed between the immunological staining of tracheal grafts preserved in Cialit and Merthiolate.

Cialit↗
PubMed1990

[Allogenic cartilage transplantation--immunohistochemical investigations on the antigenicity of the perichondrium].

Perichondrium of human nasal, tracheal, costal and conchal cartilage was analysed by an immunohistological staining technique using monoclonal antibodies against different class II antigens. Our morphological study shows clearly the presence of class II antigens on the perichondrium of nasal, tracheal and conchal cartilage. Therefore the transplantation of cartilage allograft free of perichondrium may be preferred.

Cartilage↗
PubMed1990

Proliferation rates of lymphocytes in subcutaneously transposed spleen and peripheral blood after heterotopic heart transplantation in rats.

In a transplantation model using Dark Agouti rats as heart donors and Lewis rats as recipients, mean graft survival time was 7.1 days in GII, receiving no immunosuppression, and 31.4 days in GIII, animals immunosuppressed by DSG. A higher percentage of Lb in the spleen than in the PB in the transplanted groups was detected on certain days. HCT sharply decreased in immunosuppressed animals, thus suggesting a reversible suppression of erythropoesis induced by DSG.

Animals↗
PubMed1989

Effect of thyrotropin-releasing hormone (TRH) on the chemiluminescence (CL) activity of human mononuclear cells.

The effect of the tripeptide TRH on the chemiluminescence activity of human monocytes was tested. TRH significantly (p less than 0.002) inhibited monocytes activity at pharmacological concentrations of 2 x 10(-4) M/L. The effect was not mediated via Ia or C3a-receptors as was proven by the preincubation of monocytes with the monoclonal antibodies OKIa1 and anti-C3a. Heat inactivation abolished the effect of TRH. This study has demonstrated for the first time, that pharmacological doses of TRH which had already been tentatively employed as a therapeutic agent in men can modulate immunocompetent cells.

Hot Temperature↗