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- W2359571009 abstract "Abstract Normal human B cell proliferation is controlled by various immunoregulatory signals including the T cell-derived lymphokine B cell growth factor (BCGF). The role of BCGF in the regulation of malignant B cell proliferation is unclear. Therefore, we studied the proliferative response of purified chronic lymphocytic leukemia (CLL) B cells to BCGF. For all CLL patients studied, CLL B cells showed a decreased proliferative response as compared with control B cells for BCGF- induced B cell proliferation (patient 291 +/- 59 cpm v control 3,942 +/- 622, mean +/- SEM). This impaired proliferative response appeared to be intrinsic to CLL B cells since it was not corrected by incubation with increasing concentrations of BCGF. Attainment of normal B cell responsiveness to BCGF requires the processing of an initial activation signal which results in the expression of cell surface receptors for BCGF. Increasing concentrations of the B cell activation signal (the F(ab')2 fragment of goat anti-human mu chain) did not improve CLL B cell responsiveness to BCGF. Three-day activated CLL B cells compared with activated control B cells demonstrated a marked impairment in their ability to absorb out the BCGF activity present in the BCGF preparation (BCGF activity absorbed out, patient 12.8% v control 53%). Pretreatment of CLL B cells with neuraminidase failed to improve either the proliferative response to BCGF or the expression of cell surface receptors for BCGF by the CLL B cells. This study suggests that the impaired responsiveness to BCGF by CLL B cells is the result of impaired expression of cell surface receptors for BCGF when CLL B cells are exposed to activation signals." @default.
- W2359571009 created "2016-06-24" @default.
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- W2359571009 date "1986-04-01" @default.
- W2359571009 modified "2023-09-27" @default.
- W2359571009 title "Impaired expression of cell surface receptors for B cell growth factor by chronic lymphocytic leukemia B cells" @default.
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- W2359571009 doi "https://doi.org/10.1182/blood.v67.4.943.943" @default.
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