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Kaposi's Sarcoma Herpesvirus K15 Protein Contributes to Virus-Induced Angiogenesis by Recruiting PLCγ1 and Activating NFAT1-dependent RCAN1 Expression
被引:45
作者:

Bala, Kiran
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Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany

Bosco, Raffaella
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Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany

Gramolelli, Silvia
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Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany

Haas, Darya A.
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Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany

Kati, Semra
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Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany

Pietrek, Marcel
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Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany

Haevemeier, Anika
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Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany

Yakushko, Yuri
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Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany

Singh, Vivek Vikram
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Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany

Dittrich-Breiholz, Oliver
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Hannover Med Sch, Inst Biochem, D-3000 Hannover, Germany Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany

Kracht, Michael
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Univ Giessen, Inst Pharmacol, Giessen, Germany Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany

Schulz, Thomas F.
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Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany
机构:
[1] Hannover Med Sch, Inst Virol, D-3000 Hannover, Germany
[2] Hannover Med Sch, Inst Biochem, D-3000 Hannover, Germany
[3] Univ Giessen, Inst Pharmacol, Giessen, Germany
关键词:
PRIMARY EFFUSION LYMPHOMA;
HUMAN ENDOTHELIAL-CELLS;
NF-KAPPA-B;
COUPLED RECEPTOR;
GENE-EXPRESSION;
DNA-SEQUENCES;
FUNCTIONAL-CHARACTERIZATION;
MEMBRANE-PROTEINS;
PRIMARY INFECTION;
GROWTH;
D O I:
10.1371/journal.ppat.1002927
中图分类号:
Q93 [微生物学];
学科分类号:
071005 ;
100705 ;
摘要:
Kaposi's Sarcoma (KS), caused by Kaposi's Sarcoma Herpesvirus (KSHV), is a highly vascularised angiogenic tumor of endothelial cells, characterized by latently KSHV-infected spindle cells and a pronounced inflammatory infiltrate. Several KSHV proteins, including LANA-1 (ORF73), vCyclin (ORF72), vGPCR (ORF74), vIL6 (ORF-K2), vCCL-1 (ORF-K6), vCCL-2 (ORF-K4) and K1 have been shown to exert effects that can lead to the proliferation and atypical differentiation of endothelial cells and/or the secretion of cytokines with angiogenic and inflammatory properties (VEGF, bFGF, IL6, IL8, GRO alpha, and TNF beta). To investigate a role of the KSHV K15 protein in KSHV-mediated angiogenesis, we carried out a genome wide gene expression analysis on primary endothelial cells infected with KSHV wildtype (KSHVwt) and a KSHV K15 deletion mutant (KSHV Delta K15). We found RCAN1/DSCR1 (Regulator of Calcineurin 1/Down Syndrome critical region 1), a cellular gene involved in angiogenesis, to be differentially expressed in KSHVwt- vs KSHV Delta K15-infected cells. During physiological angiogenesis, expression of RCAN1 in endothelial cells is regulated by VEGF (vascular endothelial growth factor) through a pathway involving the activation of PLC gamma 1, Calcineurin and NFAT1. We found that K15 directly recruits PLC gamma 1, and thereby activates Calcineurin/NFAT1-dependent RCAN1 expression which results in the formation of angiogenic tubes. Primary endothelial cells infected with KSHVwt form angiogenic tubes upon activation of the lytic replication cycle. This effect is abrogated when K15 is deleted (KSHVDK15) or silenced by an siRNA targeting the K15 expression. Our study establishes K15 as one of the KSHV proteins that contribute to KSHV-induced angiogenesis.
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