IL-5 induces a Pgp-1 (CD44) bright B cell subpopulation that is highly enriched in proliferative and Ig secretory activity and binds to hyaluronate - PubMed (original) (raw)
. 1990 Dec 1;145(11):3618-27.
Affiliations
- PMID: 2246506
IL-5 induces a Pgp-1 (CD44) bright B cell subpopulation that is highly enriched in proliferative and Ig secretory activity and binds to hyaluronate
S Murakami et al. J Immunol. 1990.
Abstract
Pgp-1 expression was examined in unstimulated B cell populations and in B cells activated with several polyclonal stimuli. Flow cytometry analysis demonstrated that Pgp-1 expression increased when B cells were activated with supernatant of cloned Th2 cells, with LPS, or with IL-5, stimuli that induced polyclonal proliferation and differentiation. IL-5-primed B cells were phenotypically unique and could be divided into two distinct subpopulations based on the brightness of Pgp-1 expression. Furthermore, sterile sorting experiments showed that proliferating and differentiating B cells were highly enriched in a Pgp-1-bright, Ia-dull, B220-dull subpopulation. The possibility that Pgp-1 expressed on activated B cells functions as an adhesion molecule was evaluated by assessing adhesion of activated B cells to defined substrates. It was found that IL-5-activated B cells bound strongly to hyaluronate-coated surface, and this binding was specifically inhibited by anti-Pgp-1 Ab. These findings suggest that Pgp-1 expression is a useful marker which, under defined conditions, identifies the proliferating and differentiating subset of activated B cells. Moreover, the Pgp-1 bright subset of IL-5-primed B cells binds to hyaluronate in a Pgp-1-dependent manner that suggests a potential role of Pgp-1 in the in vivo adherence and trafficking of activated B cells.
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