PubMed Health⌕ Search

Biomedical subjects

F Momburg

Publications and source records attributed to F Momburg.

94 records · Page 6Linked to original sources
PubMed1985

Induction of HLA class-II antigen expression on human carcinoma cell lines by IFN-Gamma.

The effects of recombinant interferon gamma (IFN-gamma) on HLA antigen expression were examined in various human carcinoma cell lines: carcinomas of the lung (ChaGo, Oat 75, SK-LC-LL), colon (HT-29, WiDr), larynx (HEp-2), cervix (ME-180) and mammary gland (AlAb). Surface expression of HLA antigens was determined using monoclonal antibodies directed against monomorphic determinants of HLA class II (HD II, 2.06) and HLA class I (W6/32) by several techniques including indirect immunofluorescence, immunoperoxidase assay, radioimmunoassay of cells, and immunoprecipitation of radioiodinated cells. Without previous exposure to IFN-gamma, HLA class-II antigen was surface-expressed on a small subpopulation of HEp-2 only. All cell lines examined, except AlAb, could be induced to cell-surface expression of HLA class-II antigen after 48 hr incubation in the presence of IFN-gamma (10 units/ml). HLA class-I antigen was present on all cell lines even without treatment, and it was increased after IFN-exposure. Incorporation of 3H-thymidine and 3H-leucine and expression of the transferrin receptor were not significantly altered by IFN-gamma application, indicating a specific regulatory effect of IFN-gamma on HLA antigen expression. Our data demonstrate that HLA class-II surface expression is inducible by IFN-gamma in a variety of epithelial tumor lines. This may have implications for the host immune system defense mechanisms against tumors.

Breast Neoplasms↗
PubMed1983

Immunoperoxidase slide assay (IPSA)--a new screening method for hybridoma supernatants directed against cell surface antigens compared to other binding assays.

A modified immunoperoxidase assay on microscope slides (IPSA) was adopted as a screening procedure for hybridoma supernatants with specificity for human lymphocyte subpopulations. The method proved to be suitable for testing a large number of hybridomas with a minimum of cells and reagents. In addition, the slide-technique yields considerable information about the type and morphology of target cells. This allows a first differentiation between cell types in the assayed preparation, e.g. between lymphocytes and monocytes. Compared to indirect immunofluorescence, solid-phase radioimmunoassay (RIA) and enzyme-linked immunosorbent assay (ELISA) with intact cells as antigen, IPSA turned-out to be as sensitive as RIA and superior to indirect immunofluorescence and ELISA. Nevertheless, none of the assays used detected all supernatants binding to cells in the right manner and could, thus, be considered ideal. In our hands, the combination of RIA and IPSA proved to be an excellent system for screening procedures on lymphocytes.

Animals↗