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S J Hausman

Publications and source records attributed to S J Hausman.

6 recordsLinked to original sources
PubMed1977

Serological distinciton of heavy chain variable regions (VH subgroups) of mouse immunoglobulins. I. Common VH determinants on the heavy chains of mouse myeloma proteins having different binding sites.

16 of more than 100 mouse myeloma proteins, including 3 proteins of the IgG2a class and 13 of the IgA class, were shown to have a similar heavy chain variable region (VH) antigen(s) (U10-173). The proteins bearing these antigenic determinants (U10-173+ proteins) represented at least five different ligand-binding specificities. These findings, taken togeter with available sequence data for VH regions of U10-173+ proteins, have led us to conclude that U10-173 defines a small number of related VH subgroups. The ability to detect VH subgroups in mice by serological means, as has been done in humans also, promises new and useful kinds of VH markers for immunologic study.

Animals↗
PubMed1975

Alteration of immunoglobulin phenotype in cell culture-adapted lines of two mouse plasmacytomas.

Murine plasmacytomas can be adapted to continuous in vitro culture by alternate passage between culture and animal. We have found that the kinetics of adaptation reflect a selection for the growth of variant plasmacytoma cells. The inclusion of an altered immunoglobulin phenotype in such variant cells could explain the Ig-producing variants that we observed in two of six transplantable lines of plasmacytomas that were adapted to culture. The first variant, an IgM-producing cell line (104-76), was adapted from a transplanted line of MOPC 104E that had stopped producing IgM with binding specificity for alpha1-3 Dextran. Unlike MOPC 104E, the IgM of 104-76 contains kappa- instead of lambda-light chains and probably contains an altered or different mu-heavy chain. A second variant (352-57) was found in an IgG2b-producing tumor (MOPC 352) which was induced in a BALB/c mouse strain (CB-6) that carried Ig genes of the C57BL/Ka allotype. This cell line apparently switched from producing IgG2b molecules of the C57BL allotype (H9) and of a known idiotype to IgG1 molecules of the BALB/c allotype (F19) without the idiotype marker. The propagation of a biclonal plasmacytoma from the time of original tumor induction does not appear as a likely explanation for these results. Rather, we seem to be dealing with plasmacytoma variants or with the possible induction of secondary tumors of host origin.

Animals↗
PubMed1971

The dependence of cecropia yolk formation in vitro on specific blood proteins.

The capacity of cecropia vitellogenic follicles to form yolk during short-term in vitro incubation in female blood was analyzed by labeling with fluorescein-conjugated serum globulin, tritiated cecropia blood proteins, or tritiated amino acid. As judged by fluorescence microscopy or autoradiography, yolk formation during 3-8 hr in vitro was similar in rate and in protein uptake specificity to that observed in vivo. When follicles were incubated in cecropia male blood, 6% gamma globulin, or cecropia saline, the yolk produced was markedly inferior in quality and quantity to that generated in female blood. Purified preparations of vitellogenin, the primary female blood protein deposited in the yolk, were equivalent to whole female blood in supporting yolk formation; this protein seems, therefore, to have a specific stimulatory role. An enhancement of the rate of pinocytosis at the oocyte surface by vitellogenin is postulated.

Amino Acids↗