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Amoebic PI3K and PKC Is Required for Jurkat T Cell Death Induced by Entamoeba histolytica

 Young Ah Lee  ;  Kyeong Ah Kim  ;  Arim Min  ;  Myeong Heon Shin 
 KOREAN JOURNAL OF PARASITOLOGY, Vol.52(4) : 355-365, 2014 
Journal Title
Issue Date
Apoptosis* ; Caspases/metabolism ; Entamoeba histolytica/enzymology* ; Entamoeba histolytica/growth & development* ; Humans ; Hydrolysis ; Jurkat Cells ; Phosphatidylinositol 3-Kinases/metabolism* ; Protein Kinase C/metabolism* ; T-Lymphocytes/parasitology* ; T-Lymphocytes/physiology*
Entamoeba histolytica ; adhesion ; caspase ; host cell death ; phosphorylinositol 3-kinase (PI3K) ; protein kinase C (PKC)
The enteric protozoan parasite Entamoeba histolytica is the causative agent of human amebiasis. During infection, adherence of E. histolytica through Gal/GalNAc lectin on the surface of the amoeba can induce caspase-3-dependent or -independent host cell death. Phosphorylinositol 3-kinase (PI3K) and protein kinase C (PKC) in E. histolytica play an important function in the adhesion, killing, or phagocytosis of target cells. In this study, we examined the role of amoebic PI3K and PKC in amoeba-induced apoptotic cell death in Jurkat T cells. When Jurkat T cells were incubated with E. histolytica trophozoites, phosphatidylserine (PS) externalization and DNA fragmentation in Jurkat cells were markedly increased compared to those of cells incubated with medium alone. However, when amoebae were pretreated with a PI3K inhibitor, wortmannin before being incubated with E. histolytica, E. histolytica-induced PS externalization and DNA fragmentation in Jurkat cells were significantly reduced compared to results for amoebae pretreated with DMSO. In addition, pretreatment of amoebae with a PKC inhibitor, staurosporine strongly inhibited Jurkat T cell death. However, E. histolytica-induced cleavage of caspase-3, -6, and -7 were not inhibited by pretreatment of amoebae with wortmannin or staurosporin. In addition, we found that amoebic PI3K and PKC have an important role on amoeba adhesion to host compartment. These results suggest that amebic PI3K and PKC activation may play an important role in caspase-independent cell death in Entamoeba-induced apoptosis.
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1. College of Medicine (의과대학) > Dept. of Environmental Medical Biology (환경의생물학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kyung Ah(김경아)
Min, A Rim(민아림) ORCID logo https://orcid.org/0000-0003-2938-9630
Shin, Myeong Heon(신명헌) ORCID logo https://orcid.org/0000-0001-8207-6110
Lee, Young Ah(이영아) ORCID logo https://orcid.org/0000-0002-0414-842X
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