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Differentiation in the murine B cell lymphoma I.29: individual mu + clones may be induced by lipopolysaccharide to both IgM secretion and isotype switching.

Abstract：

:Cells from the monoclonal B cell lymphoma I.29 expressing surface IgM (mu +) are capable of differentiating in vitro to IgM secretion and of switching to IgA or IgE production in response to lipopolysaccharide (LPS) stimulation. To determine whether a single mu + B cell is capable of undertaking both differentiative pathways (isotype switch and plasma cell differentiation) I.29 mu + cells were cloned by limiting dilution and a panel of clones were analyzed by immunofluorescence, endogenous labeling and Northern blotting. While 100% of the clones could differentiate toward IgM secretion, only a proportion of them (greater than 70%) also switched to IgA and/or IgE production. Certain clones switched preferentially to a specific isotype. Taken together with the observation that C gamma genes were never the target of switching in our experiments, these data suggest that individual mu + clones from the I.29 lymphoma are "precommitted" as for their switching potentials. The subclones that showed a high frequency of switching to IgA transcribed the germ line C alpha gene(s), suggesting a role for chromatin structure in determining the isotype switch specificity. Switch variant clones expressing either IgA or IgE on the cell surface were isolated and found capable of further differentiating toward Ig secretion in response to LPS. On the contrary, we could not induce switch to IgA in IgE-producing cells. Unlike mu + and alpha + cells, all the switch variant clones expressing IgE tested by endogenous labeling constitutively secreted large amounts of IgE in the supernatants even in the absence of LPS stimulation.

journal_name

Eur J Immunol

journal_title

European journal of immunology

authors

Alberini C,Biassoni R,DeAmbrosis S,Vismara D,Sitia R

doi

10.1002/eji.1830170419

subject

Has Abstract

pub_date

1987-04-01 00:00:00

pages

555-62

issue

4

eissn

0014-2980

issn

1521-4141

journal_volume

17

pub_type

杂志文章

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