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

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-de...

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Veröffentlicht in:Journal of cell science 2003-04, Vol.116 (Pt 7), p.1339-1348
Hauptverfasser: Rudolf, Rüdiger, Kögel, Tanja, Kuznetsov, Sergei A, Salm, Thorsten, Schlicker, Oliver, Hellwig, Andrea, Hammer, 3rd, John A, Gerdes, Hans-Hermann
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Sprache:eng
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Zusammenfassung: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.
ISSN:0021-9533
1477-9137
DOI:10.1242/jcs.00317