» Articles » PMID: 21374596

AKAP350 Is Involved in the Development of Apical "canalicular" Structures in Hepatic Cells HepG2

Overview
Journal J Cell Physiol
Specialties Cell Biology
Physiology
Date 2011 Mar 5
PMID 21374596
Citations 9
Authors
Affiliations
Soon will be listed here.
Abstract

Hepatocytes are epithelial cells whose apical poles constitute the bile canaliculi. The establishment and maintenance of canalicular poles is a finely regulated process that dictates the efficiency of primary bile secretion. Protein kinase A (PKA) modulates this process at different levels. AKAP350 is an A-kinase anchoring protein that scaffolds protein complexes involved in modulating the dynamic structures of the Golgi apparatus and microtubule cytoskeleton, facilitating microtubule nucleation at this organelle. In this study, we evaluated whether AKAP350 is involved in the development of bile canaliculi-like structures in hepatocyte derived HepG2 cells. We found that AKAP350 recruits PKA to the centrosomes and Golgi apparatus in HepG2 cells. De-localization of AKAP350 from these organelles led to reduced apical cell polarization. A decrease in AKAP350 expression inhibited the formation of canalicular structures and impaired F-actin organization at canalicular poles. Furthermore, loss of AKAP350 expression led to diminished polarized expression of the p-glycoprotein (MDR1/ABCB1) at the apical "canalicular" membrane. AKAP350 knock down effects on canalicular structures formation and actin organization could be mimicked by inhibition of Golgi microtubule nucleation by depletion of CLIP associated proteins (CLASPs). Our data reveal that AKAP350 participates in mechanisms which determine the development of canalicular structures as well as accurate canalicular expression of distinct proteins and actin organization, and provide evidence on the involvement of Golgi microtubule nucleation in hepatocyte apical polarization.

Citing Articles

Metformin and glucose starvation decrease the migratory ability of hepatocellular carcinoma cells: targeting AMPK activation to control migration.

Ferretti A, Hidalgo F, Tonucci F, Almada E, Pariani A, Larocca M Sci Rep. 2019; 9(1):2815.

PMID: 30809021 PMC: 6391381. DOI: 10.1038/s41598-019-39556-w.


Akap350 Recruits Eb1 to The Spindle Poles, Ensuring Proper Spindle Orientation and Lumen Formation in 3d Epithelial Cell Cultures.

Almada E, Tonucci F, Hidalgo F, Ferretti A, Ibarra S, Pariani A Sci Rep. 2017; 7(1):14894.

PMID: 29097729 PMC: 5668257. DOI: 10.1038/s41598-017-14241-y.


Microtubules regulate brush border formation.

Tonucci F, Ferretti A, Almada E, Cribb P, Vena R, Hidalgo F J Cell Physiol. 2017; 233(2):1468-1480.

PMID: 28548701 PMC: 5673559. DOI: 10.1002/jcp.26033.


RSK1 protects P-glycoprotein/ABCB1 against ubiquitin-proteasomal degradation by downregulating the ubiquitin-conjugating enzyme E2 R1.

Katayama K, Fujiwara C, Noguchi K, Sugimoto Y Sci Rep. 2016; 6:36134.

PMID: 27786305 PMC: 5081560. DOI: 10.1038/srep36134.


AMPK and PKA interaction in the regulation of survival of liver cancer cells subjected to glucose starvation.

Ferretti A, Tonucci F, Hidalgo F, Almada E, Larocca M, Favre C Oncotarget. 2016; 7(14):17815-28.

PMID: 26894973 PMC: 4951252. DOI: 10.18632/oncotarget.7404.


References
1.
Kipp H, Arias I . Intracellular trafficking and regulation of canalicular ATP-binding cassette transporters. Semin Liver Dis. 2000; 20(3):339-51. DOI: 10.1055/s-2000-9388. View

2.
Kikuchi S, Hata M, Fukumoto K, Yamane Y, Matsui T, Tamura A . Radixin deficiency causes conjugated hyperbilirubinemia with loss of Mrp2 from bile canalicular membranes. Nat Genet. 2002; 31(3):320-5. DOI: 10.1038/ng905. View

3.
Kolobova E, Efimov A, Kaverina I, Rishi A, Schrader J, Ham A . Microtubule-dependent association of AKAP350A and CCAR1 with RNA stress granules. Exp Cell Res. 2008; 315(3):542-55. PMC: 2788823. DOI: 10.1016/j.yexcr.2008.11.011. View

4.
Mimori-Kiyosue Y, Grigoriev I, Lansbergen G, Sasaki H, Matsui C, Severin F . CLASP1 and CLASP2 bind to EB1 and regulate microtubule plus-end dynamics at the cell cortex. J Cell Biol. 2005; 168(1):141-53. PMC: 2171674. DOI: 10.1083/jcb.200405094. View

5.
Grindstaff K, Bacallao R, Nelson W . Apiconuclear organization of microtubules does not specify protein delivery from the trans-Golgi network to different membrane domains in polarized epithelial cells. Mol Biol Cell. 1998; 9(3):685-99. PMC: 25297. DOI: 10.1091/mbc.9.3.685. View