RRC ID 46079
著者 Feldman JL, Priess JR.
タイトル A role for the centrosome and PAR-3 in the hand-off of MTOC function during epithelial polarization.
ジャーナル Curr Biol
Abstract BACKGROUND:The centrosome is the major microtubule organizing center (MTOC) in dividing cells and in many postmitotic, differentiated cells. In other cell types, however, MTOC function is reassigned from the centrosome to noncentrosomal sites. Here, we analyze how MTOC function is reassigned to the apical membrane of C. elegans intestinal cells.
RESULTS:After the terminal intestinal cell division, the centrosomes and nuclei move near the future apical membranes, and the postmitotic centrosomes lose all, or nearly all, of their associated microtubules. We show that microtubule-nucleating proteins such as γ-tubulin and CeGrip-1 that are centrosome components in dividing cells become localized to the apical membrane, which becomes highly enriched in microtubules. Our results suggest that centrosomes are critical to specify the apical membrane as the new MTOC. First, γ-tubulin appears to redistribute directly from the migrating centrosome onto the lateral then apical membrane. Second, γ-tubulin fails to accumulate apically in wild-type cells following laser ablation of the centrosome. We show that centrosomes localize apically by first moving toward lateral foci of the conserved polarity proteins PAR-3 and PAR-6 and then move together with these foci toward the future apical surface. Embryos lacking PAR-3 fail to localize their centrosomes apically and have aberrant localization of γ-tubulin and CeGrip-1.
CONCLUSIONS:These data suggest that PAR proteins contribute to apical polarity in part by determining centrosome position and that the reassignment of MTOC function from centrosomes to the apical membrane is associated with a physical hand-off of nucleators of microtubule assembly.
巻・号 22(7)
ページ 575-82
公開日 2012-4-10
DOI 10.1016/j.cub.2012.02.044
PII S0960-9822(12)00195-9
PMID 22425160
PMC PMC3409831
MeSH Animals Caenorhabditis elegans / cytology* Caenorhabditis elegans / embryology* Caenorhabditis elegans / metabolism Caenorhabditis elegans Proteins / metabolism* Cell Differentiation Centromere / metabolism Embryo, Nonmammalian / cytology Embryo, Nonmammalian / metabolism Epithelial Cells / metabolism Intestinal Mucosa / metabolism Intestines / cytology Intestines / embryology Lasers Microscopy, Electron Microtubule Proteins / metabolism* Microtubule-Associated Proteins / metabolism Microtubule-Organizing Center / metabolism* Microtubules / metabolism* Mitosis Mutation Protein Serine-Threonine Kinases Tubulin / metabolism
IF 9.601
引用数 70
WOS 分野 BIOCHEMISTRY & MOLECULAR BIOLOGY CELL BIOLOGY
リソース情報
線虫 tm1425 tm2716 tm2645