首页> 外文期刊>Clinical immunology: The official journal of the Clinical Immunology Society >Spontaneous secretion of immunoglobulins and anti-HIV-1 antibodies by in vivo activated B lymphocytes from HIV-1-infected subjects: monocyte and natural killer cell requirement for in vitro terminal differentiation into plasma cells.
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Spontaneous secretion of immunoglobulins and anti-HIV-1 antibodies by in vivo activated B lymphocytes from HIV-1-infected subjects: monocyte and natural killer cell requirement for in vitro terminal differentiation into plasma cells.

机译:感染HIV-1的受试者体内激活的B淋巴细胞自发分泌免疫球蛋白和抗HIV-1抗体:单核细胞和自然杀伤细胞对体外最终分化为浆细胞的需求。

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摘要

Peripheral blood mononuclear cells from HIV-1-infected subjects secrete spontaneously in vitro immunoglobulins (Ig) and anti-HIV-1 antibodies (Ab). Purified B lymphocytes secrete only minute amounts of Ig and anti-HIV-1 Ab compared with unfractionated cells. Monocytes and natural killer cells enhanced both secretions by cell-to-cell contacts, involving adhesion and CD27, CD80 costimulatory molecules and IL-6. Cell interactions prolonged the survival and allowed the terminal maturation of in vivo activated B cells. The secreting cell precursors were highly differentiated B cells expressing a broad diversity of maturation markers (CD27(+), CD38(+), CD20(+/-), CD37(+/-), CD71(+/-), HLA-DQ(+/-), sIg(+/-)) but not sIgD, CD28, or CD40. This phenotype and the cytologic aspect of purified B cells suggest that these cells are early plasma cells originated from germinal center. Ex vivo secreting peripheral B cells had probably gone beyond the CD40/CD40 ligand interaction; then following CD28/CD80 and CD27/CD27 ligand (CD70) interactions in the presence of IL-6, they achieved in vitro their differentiation into plasma cells.
机译:来自感染HIV-1的受试者的外周血单核细胞在体外自发分泌免疫球蛋白(Ig)和抗HIV-1抗体(Ab)。与未分级分离的细胞相比,纯化的B淋巴细胞仅分泌微量的Ig和抗HIV-1 Ab。单核细胞和自然杀伤细胞通过细胞间接触增强粘附力,涉及粘附和CD27,CD80共刺激分子和IL-6。细胞相互作用延长了存活时间,并使体内活化的B细胞最终成熟。分泌细胞的前体是高度分化的B细胞,表达广泛的成熟标记(CD27(+),CD38(+),CD20(+/-),CD37(+/-),CD71(+/-),HLA- DQ(+/-),sIg(+/-)),但不是sIgD,CD28或CD40。纯化的B细胞的这种表型和细胞学方面表明,这些细胞是起源于生发中心的早期浆细胞。离体分泌的外周血B细胞可能已经超出了CD40 / CD40配体的相互作用。然后在存在IL-6的情况下跟随CD28 / CD80和CD27 / CD27配体(CD70)相互作用,他们在体外实现了向浆细胞的分化。

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