Increased levels of the cell cycle inhibitor protein, dacapo, accompany 20-hydroxyecdysone-induced G1 arrest in a mosquito cell line.

Autor(es): Gerenday Anna; Fallon Ann M

Resumo: When treated with the steroid hormone 20-hydroxyecdysone (20E), C7-10 cells from the mosquito, Aedes albopictus, arrest in the G1 phase of the cell cycle. To explore whether 20E-mediated cell cycle arrest proceeds through increased levels of cell cycle inhibitor (CKI) proteins, we cloned the Ae. albopictus homolog of dacapo, the single member of the Cip/Kip family of CKI proteins known from Drosophila melanogaster. The Ae. albopictus dacapo cDNA encoded a 261-amino acid homolog of the Aedes aegypti protein XP_001651102.1, which is encoded by an ?23 kb gene containing three exons. Like dacapo from D. melanogaster, the ?27 kDa protein from Aedes and Culex mosquitoes contained several S/TXXE/D motifs corresponding to potential protein kinase CK2 phosphorylation sites, and a binding site for proliferating cell nuclear antigen (PCNA). When extracts from cells treated with 20E were analyzed by western blotting, using a primary antibody to synthetic peptides from the mosquito dacapo protein, up-regulation of an ?27 kDa protein was observed within 24 h, and the abundance of the protein further increased by 48 h after hormone treatment. This is the first investigation of a cell cycle inhibitory protein in mosquitoes. The results reinforce growing evidence that 20E affects expression of proteins that regulate cell cycle progression.

Imprenta: Archives of Insect Biochemistry and Physiology, v. 78, n. 2, p. 61-73, 2011

Identificador do objeto digital: 10.1002/arch.20440.

Descritores: Aedes aegypti - Cell ; Aedes aegypti - DNA ; Aedes aegypti - Molecular Structure ; Aedes aegypti - Pathogenesis ; Aedes aegypti - Proteins

Data de publicação: 2011