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2017 ; 7
(1
): 14888
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A model integrating tonic and antigen-triggered BCR signals to predict the
survival of primary B cells
#MMPMID29097663
Yasuda S
; Zhou Y
; Wang Y
; Yamamura M
; Wang JY
Sci Rep
2017[Nov]; 7
(1
): 14888
PMID29097663
show ga
The BCR constitutively transmits a "tonic" survival signal in the absence of
exogenous antigen-binding. However, the strength of tonic BCR signal and its
relationship with antigen-triggered survival signal are poorly understood. We
found that primary B cells expressing high levels of BCR had elevated BCR tonic
signal and increased survival compared with those expressing low levels of BCR.
In addition, we found that crosslinking BCR with low doses of F(ab')(2) ?-IgM
antibodies did not enhance, but rather decreased, B cell survival and that only
when most of the BCR were occupied by F(ab')(2) ?-IgM antibodies was B cell
survival enhanced. Based on these experimental results, we present a mathematical
model integrating tonic and antigen-triggered BCR signals. Our model indicates
that the signal generated from crosslinked BCR is 4.3 times as strong as the
tonic signal generated from free BCR and that the threshold of B cell activation
corresponds to the signal generated by crosslinking 61% of the surface BCR. This
model also allows the prediction of the survival probability of a B cell based on
its initial BCR level and the strength and duration of antigen stimulation, and
fits with the mechanism of B cell tolerance.