title: Increased centrosome amplification in aged stem cells of the Drosophila midgut.
abstract: Age-related changes in long-lived tissue-resident stem cells may be tightly linked to aging and age-related diseases such as cancer. Centrosomes play key roles in cell proliferation, differentiation and migration. Supernumerary centrosomes are known to be an early event in tumorigenesis and senescence. However, the age-related changes of centrosome duplication in tissue-resident stem cells in vivo remain unknown. Here, using anti-γ-tubulin and anti-PH3, we analyzed mitotic intestinal stem cells with supernumerary centrosomes in the adult Drosophila midgut, which may be a versatile model system for stem cell biology. The results showed increased centrosome amplification in intestinal stem cells of aged and oxidatively stressed Drosophila midguts. Increased centrosome amplification was detected by overexpression of PVR, EGFR, and AKT in intestinal stem cells/enteroblasts, known to mimic age-related changes including hyperproliferation of intestinal stem cells and hyperplasia in the midgut. Our data show the first direct evidence for the age-related increase of centrosome amplification in intestinal stem cells and suggest that the Drosophila midgut is an excellent model for studying molecular mechanisms underlying centrosome amplification in aging adult stem cells in vivo.
authors: Department of Molecular Biology, Pusan National University, Busan 609-735, Republic of Korea.
authors: Joung-Sun
authors: JS
authors: Park
authors: Department of Molecular Biology, Pusan National University, Busan 609-735, Republic of Korea.
authors: Jung-Hoon
authors: JH
authors: Pyo
authors: Department of Molecular Biology, Pusan National University, Busan 609-735, Republic of Korea.
authors: Hyun-Jin
authors: HJ
authors: Na
authors: Department of Molecular Biology, Pusan National University, Busan 609-735, Republic of Korea.
authors: Ho-Jun
authors: HJ
authors: Jeon
authors: Department of Molecular Biology, Pusan National University, Busan 609-735, Republic of Korea.
authors: Young-Shin
authors: YS
authors: Kim
authors: Department of Biological Sciences, Wayne State University, Detroit, MI 48202, USA. Electronic address: aa2210@wayne.edu.
authors: Robert
authors: R
authors: Arking
authors: Department of Molecular Biology, Pusan National University, Busan 609-735, Republic of Korea. Electronic address: mayoo@pusan.ac.kr.
authors: Mi-Ae
authors: MA
authors: Yoo
mesh_terms: D000818:Animals; D016922:Cellular Senescence; D018385:Centrosome / Q000648:ultrastructure*; D004330:Drosophila / Q000166:cytology* / Q000378:metabolism; D029721:Drosophila Proteins / Q000378:metabolism; D066246:ErbB Receptors / Q000378:metabolism; D007422:Intestines / Q000166:cytology; D008938:Mitosis; D018384:Oxidative Stress; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D020794:Receptor Protein-Tyrosine Kinases / Q000378:metabolism; D018010:Receptors, Invertebrate Peptide / Q000378:metabolism; D013234:Stem Cells / Q000648:ultrastructure*
chemical_list: D029721:Drosophila Proteins; D018010:Receptors, Invertebrate Peptide; C066532:Egfr protein, Drosophila; D066246:ErbB Receptors; C438368:Pvr protein, Drosophila; D020794:Receptor Protein-Tyrosine Kinases; D051057:Proto-Oncogene Proteins c-akt
keywords: Adult stem cell; Aging; Centrosome; Drosophila midgut; EGFR; PVR