title: Gene expression profiling identifies FKBP39 as an inhibitor of autophagy in larval Drosophila fat body.
abstract: In Drosophila, the fat body undergoes a massive burst of autophagy at the end of larval development in preparation for the pupal transition. To identify genes involved in this process, we carried out a microarray analysis. We found that mRNA levels of the homologs of Atg8, the coat protein of early autophagic structures, and lysosomal hydrolases were upregulated, consistent with previous results. Genes encoding mitochondrial proteins and many chaperones were downregulated, including the inhibitor of eIF2alpha kinases and the peptidyl-prolyl cis-trans isomerase FK506-binding protein of 39 kDa (FKBP39). Genetic manipulation of FKBP39 expression had a significant effect on autophagy, potentially through modulation of the transcription factor Foxo. Accordingly, we found that Foxo mutants cannot properly undergo autophagy in response to starvation, and that overexpression of Foxo induces autophagy.
authors.affiliation: Department of General Zoology, Eötvös Loránd University, Budapest, Hungary. juhas001@umn.edu
authors.forename: G
authors.initials: G
authors.lastname: Juhász
authors.forename: L G
authors.initials: LG
authors.lastname: Puskás
authors.forename: O
authors.initials: O
authors.lastname: Komonyi
authors.forename: B
authors.initials: B
authors.lastname: Erdi
authors.forename: P
authors.initials: P
authors.lastname: Maróy
authors.forename: T P
authors.initials: TP
authors.lastname: Neufeld
authors.forename: M
authors.initials: M
authors.lastname: Sass
mesh_terms: D000818:Animals; D001343:Autophagy / Q000235:genetics* / Q000502:physiology; D004330:Drosophila / Q000235:genetics* / Q000254:growth & development; D029721:Drosophila Proteins / Q000235:genetics* / Q000502:physiology; D005216:Fat Body / Q000378:metabolism*; D051858:Forkhead Transcription Factors / Q000235:genetics / Q000502:physiology; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D007814:Larva / Q000235:genetics; D009154:Mutation; D020411:Oligonucleotide Array Sequence Analysis; D051059:PTEN Phosphohydrolase / Q000235:genetics / Q000502:physiology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D022021:Tacrolimus Binding Proteins / Q000235:genetics* / Q000502:physiology
chemical_list: D029721:Drosophila Proteins; C093658:FKBP39 protein, Drosophila; C477334:FOXO protein, Drosophila; D051858:Forkhead Transcription Factors; D051059:PTEN Phosphohydrolase; C487101:PTEN protein, Drosophila; D022021:Tacrolimus Binding Proteins