Restricted accumulation of phosphatidylinositol 3-kinase products in a plasmalemmal subdomain during Fcγ receptor-mediated phagocytosis

被引:225
作者
Marshall, JG
Booth, JW
Stambolic, V
Mak, T
Balla, T
Schreiber, AD
Meyer, T
Grinstein, S
机构
[1] Hosp Sick Children, Div Cell Biol, Toronto, ON M5G 1X8, Canada
[2] Amgen Inst, Toronto, ON M5G 2C1, Canada
[3] NICHHD, Endocrinol & Reprod Res Branch, NIH, Bethesda, MD 20892 USA
[4] Univ Penn, Sch Med, Dept Med, Philadelphia, PA 19104 USA
[5] Stanford Univ, Dept Mol Pharmacol, Stanford, CA 94305 USA
关键词
Fc gamma receptors; PH domain; phosphoinositide; lipid mobility; FRAP;
D O I
10.1083/jcb.153.7.1369
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Phagocytosis is a highly localized and rapid event, requiring the generation of spatially and temporally restricted signals. Because phosphatidylinositol 3-kinase (PI3K) plays an important role in the innate immune response, we studied the generation and distribution of 3' phosphoinositides (3'PIs) in macrophages during the course of phagocytosis, The presence of 3'PI was monitored noninvasively in cells transfected with chimeras of green fluorescent protein and the pleckstrin homology domain of either Akt, Btk, or Gab1, Although virtually undetectable in unstimulated cells, 3'PI rapidly accumulated at sites: of phagocytosis. This accumulation was sharply restricted to the phagosomal cup, with little 3'PI detectable in the immediately adjacent areas of the plasmalemma. Measurements of fluorescence recovery after photobleaching were made to estimate the mobility of lipids in the cytosolic monolayer of the phagosomal membrane. Stimulation of phagocytic receptors induced a marked reduction of lipid mobility that likely contributes to the restricted distribution of 3'PI at the cup. 3'PI accumulation during phagocytosis was transient, terminating shortly after sealing of the phagosomal vacuole. Two factors contribute to the rapid disappearance of 3'PI: the dissociation of the type I PI3K from the phagosomal membrane and the persistent accumulation of phosphoinositide phosphatases.
引用
收藏
页码:1369 / 1380
页数:12
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