By Frank J. Dixon (Ed.)
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Extra info for Advances in Immunology, Vol. 42
1977). Findings similar to these have been obtained by several laboratories using the same or other antiidiotypes specific for T15, as well as antiidiotypes against other dominant CLONOTYPE REPERTOIRE OF B CELL SUBPOPULATIONS v) m z- 53 40 30 20 10 ID c 2 0 60 50 40 30 20 10 50 75 100 125 150165 180 .. 4. Age-dependent expression of T15' clones in anti-PC response of normal (A) and suppressed mice (B). Columns represent the total response in terms of PC-specific clones/106 B cells for individual donor mice.
D. ENVIRONMENTAL DOWN-REGULATION IN CLONOTYPE REPERTOIREEXPRESSION In contrast to the lack of evidence for environmental participation in either repertoire diversification or the up-regulation of the frequency of B cells of predominant clonotypes, there are now several examples wherein the frequency of mature splenic B cells of a given specificity or clonotype subset is significantly lower than anticipated from the normalized frequency of cells of the same specificity or clonotype subset present in the sIg- bone marrow precursor cell pool.
First, the demonstration that B cells are expressed as clones implies that the repertoire of any given mouse would be substantially smaller than the total number of B cells (approximately 2 x 10') present in the reticuloendothelial system of CLONOTYPE REPERTOIRE OF B CELL SUBPOPULATIONS 33 that individual. For example, if the average clone size is lo2,then any mouse would have 2 X lo6different clonotypes within its mature B cell pool. Furthermore, since the estimated number of newly generated B cells per day is approximately 5 x 10' (Osmond, 1986; Osmond and Nossal, 1974) and if B cells are expressed as clones, then it may be anticipated that fewer than loEdifferent clonotypes could be expressed per day in a mouse.