Group V secretory phospholipase A2 translocates to the phagosome after zymosan stimulation of mouse peritoneal macrophages and regulates phagocytosis.
We have previously reported that group V secretory phospholipase A2 (sPLA2) amplifies the action of cytosolic phospholipase A2(cPLA2) alpha in regulating eicosanoid biosynthesis by mouse peritoneal macrophages stimulated with zymosan (Satake, Y., Diaz, B. L., Balestrieri, B., Lam, B. K., Kanaoka, Y., Grusby, M. J., and Arm, J. P. (2004) J. Biol. Chem. 279, 16488-16494). To further understand the role of group V sPLA2, we studied its localization in resting mouse peritoneal macrophages before and after stimulation with zymosan and the effect of deletion of the gene encoding group V sPLA2 on phagocytosis of zymosan. We report that group V sPLA2 is present in the Golgi apparatus and recycling endosome in the juxtanuclear region of resting peritoneal macrophages. Upon ingestion of zymosan by mouse peritoneal macrophages, group V sPLA2 is recruited to the phagosome. There it co-localizes with cPLA2alpha, 5-lipoxygenase, 5-lipoxygenase-activating protein, and leukotriene C4 synthase. Using immunostaining for the cysteinyl leukotrienes in carbodiimide-fixed cells, we show, for the first time, that the phagosome is a site of cysteinyl leukotriene formation. Furthermore, peritoneal macrophages from group V sPLA2-null mice demonstrated a >50% attenuation in phagocytosis of zymosan particles, which was restored by adenoviral expression of group V sPLA2 but IIA not group sPLA2. These data demonstrate that group V sPLA2 contributes to the innate immune response both through regulation of eicosanoid generation in response to a phagocytic stimulus and also as a component of the phagocytic machinery.
Balestrieri
Barbara
B
Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115, USA.
Hsu
Victor W
VW
Gilbert
Huiya
H
Leslie
Christina C
CC
Han
Won K
WK
Bonventre
Joseph V
JV
Arm
Jonathan P
JP
D000818:Animals; D015415:Biomarkers; D002478:Cells, Cultured; D015777:Eicosanoids / Q000096:biosynthesis; D011992:Endosomes / Q000201:enzymology; D006056:Golgi Apparatus / Q000201:enzymology; D054501:Group II Phospholipases A2; D054505:Group V Phospholipases A2; D017737:Macrophages, Peritoneal / Q000187:drug effects / Q000201:enzymology*; D051379:Mice; D018345:Mice, Knockout; D010587:Phagocytosis / Q000187:drug effects / Q000235:genetics; D010588:Phagosomes / Q000201:enzymology; D010741:Phospholipases A / Q000096:biosynthesis / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D054467:Phospholipases A2; D021381:Protein Transport / Q000187:drug effects / Q000235:genetics; D015054:Zymosan / Q000494:pharmacology*
D015415:Biomarkers; D015777:Eicosanoids; D015054:Zymosan; D010741:Phospholipases A; D054501:Group II Phospholipases A2; D054505:Group V Phospholipases A2; D054467:Phospholipases A2; C516300:Pla2g5 protein, mouse