RGD Reference Report - Myosin Va facilitates the distribution of secretory granules in the F-actin rich cortex of PC12 cells. - Rat Genome Database

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Myosin Va facilitates the distribution of secretory granules in the F-actin rich cortex of PC12 cells.

Authors: Rudolf, R  Kogel, T  Kuznetsov, SA  Salm, T  Schlicker, O  Hellwig, A  Hammer JA, 3RD  Gerdes, HH 
Citation: Rudolf R, etal., J Cell Sci 2003 Apr 1;116(Pt 7):1339-48.
RGD ID: 1298991
Pubmed: PMID:12615975   (View Abstract at PubMed)

Neuroendocrine secretory granules, the storage organelles for neuropeptides and hormones, are formed at the trans-Golgi network, stored inside the cell and exocytosed upon stimulation. Previously, we have reported that newly formed secretory granules of PC12 cells are transported in a microtubule-dependent manner from the trans-Golgi network to the F-actin-rich cell cortex, where they undergo short directed movements and exhibit a homogeneous distribution. Here we provide morphological and biochemical evidence that myosin Va is associated with secretory granules. Expression of a dominant-negative tail domain of myosin Va in PC12 cells led to an extensive clustering of secretory granules close to the cell periphery, a loss of their cortical restriction and a strong reduction in their motility in the actin cortex. Based on this data we propose a model that implies a dual transport system for secretory granules: after microtubule-dependent delivery to the cell periphery, secretory granules exhibit a myosin Va-dependent transport leading to their restriction and even dispersal in the F-actin-rich cortex of PC12 cells.



Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Myo5aRatsecretory granule localization  IDA  RGD 

Cellular Component

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Myo5aRatsecretory granule  IDA  RGD 

Objects Annotated

Genes (Rattus norvegicus)
Myo5a  (myosin VA)


Additional Information