Nef induces apoptosis by activating JNK signaling pathway and inhibits NF-kappaB-dependent immune responses in Drosophila.
The human immunodeficiency virus type 1 (HIV-1) nef gene encodes a 27-kDa protein that plays a crucial role during AIDS pathogenesis, but its exact functional mechanism has not been fully elucidated and remains controversial. The present study illuminated the in vivo functions of Nef using Drosophila, in which genetic analyses can be conveniently conducted. Using Drosophila transgenic lines for wild-type Nef, we demonstrated that Nef is not involved in the regulation of cell proliferation but rather specifically induces caspase-dependent apoptosis in wings in a cell-autonomous manner. Interestingly, myristoylation-defective Nef completely failed to induce the apoptotic wing phenotypes, consistent with previous reports demonstrating a crucial role for membrane localization of Nef in vivo. Further genetic and immunohistochemical studies revealed that Nef-dependent JNK activation is responsible for apoptosis. Furthermore, we found that ectopic expression of Nef inhibits Drosophila innate immune responses including Relish NF-kappaB activation with subsequent induction of an antimicrobial peptide, diptericin. The in vivo functions of Nef in Drosophila are highly consistent with those found in mammals and so we propose that Nef regulates evolutionarily highly conserved signaling molecules of the JNK and NF-kappaB signaling pathways at the plasma membrane, and consequently modulates apoptosis and immune responses in HIV target cells.
Lee
Sung Bae
SB
National Creative Research Initiatives Center for Cell Growth Regulation and Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea.
Park
Jeehye
J
Jung
Jae U
JU
Chung
Jongkyeong
J
D000818:Animals; D030801:Animals, Genetically Modified; D017209:Apoptosis; D015152:Blotting, Northern; D001973:Bromodeoxyuridine / Q000494:pharmacology; D020169:Caspases / Q000378:metabolism; D002462:Cell Membrane / Q000378:metabolism; D049109:Cell Proliferation; D003001:Cloning, Molecular; D004330:Drosophila; D015693:Gene Products, nef / Q000378:metabolism*; D015497:HIV-1 / Q000378:metabolism*; D007107:Immune System; D007150:Immunohistochemistry; D020287:In Situ Nick-End Labeling; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism*; D007763:Lac Operon; D048670:MAP Kinase Kinase 4; D020929:Mitogen-Activated Protein Kinase Kinases / Q000378:metabolism*; D008954:Models, Biological; D009227:Myristic Acids / Q000737:chemistry; D016328:NF-kappa B / Q000378:metabolism*; D010641:Phenotype; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D013997:Time Factors; D019076:Transgenes; D054311:nef Gene Products, Human Immunodeficiency Virus
D015693:Gene Products, nef; D009227:Myristic Acids; D016328:NF-kappa B; D054311:nef Gene Products, Human Immunodeficiency Virus; D048031:JNK Mitogen-Activated Protein Kinases; D048670:MAP Kinase Kinase 4; D020929:Mitogen-Activated Protein Kinase Kinases; D020169:Caspases; D001973:Bromodeoxyuridine