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AKAP350 modulates microtubule dynamics

M Cecilia Larocca1, Min Jin, James R Goldenring

  • 1Department of Surgery, Epithelial Biology Program, Vanderbilt University School of Medicine, 4160A MRB III, 465 21st Street S., Nashville, TN 37232-2733, USA.

European Journal of Cell Biology
|December 17, 2005
PubMed

Insights

A kinase-anchoring protein 350 (AKAP350) is crucial for microtubule cytoskeleton remodeling. Depleting AKAP350 delays microtubule regrowth and increases cdc42 activity, impacting cellular structure.

Area of Science:

  • Cell Biology
  • Cytoskeleton Dynamics
  • Molecular Cell Biology

Background:

  • A kinase-anchoring protein 350 (AKAP350) localizes to centrosomes and the Golgi apparatus.
  • AKAP350 is implicated in microtubule nucleation and Golgi integrity maintenance.
  • Previous research suggests AKAP350's role in cytoskeletal interactions with the Golgi.

Purpose of the Study:

  • To investigate the relationship between AKAP350 and the microtubule cytoskeleton.
  • To determine the effect of AKAP350 depletion on microtubule regrowth dynamics.

Main Methods:

  • Utilized short interfering RNA (siRNA) to deplete AKAP350 expression in HeLa cells.
  • Analyzed microtubule regrowth following nocodazole treatment.
  • Assessed microtubule aster formation and elongation.
  • Measured cdc42 activity during microtubule regrowth.

Main Results:

  • AKAP350 depletion delayed microtubule elongation but did not affect aster formation.
  • Overexpression of the AKAP350 centrosomal targeting domain altered aster formation without affecting elongation.
  • RNA interference for AKAP350 led to increased cdc42 activity during microtubule regrowth.

Conclusions:

  • AKAP350 plays a significant role in the remodeling of the microtubule cytoskeleton.
  • AKAP350 influences microtubule dynamics, potentially through interactions with cdc42.
  • The findings provide new insights into AKAP350's function beyond microtubule nucleation.

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