Real-time measurement of F-Actin remodelling during exocytosis using lifeact-EGFP transgenic animals
Jang, Yujin , Soekmadji, Carolina, Mitchell, Justin M. , Thomas, Walter G. , & Thorn, Peter (2012) Real-time measurement of F-Actin remodelling during exocytosis using lifeact-EGFP transgenic animals. PLOS One, 7(7), e39815.
F-actin remodelling is essential for a wide variety of cell processes. It is important in exocytosis, where F-actin coats fusing exocytic granules. The purpose of these F-actin coats is unknown. They may be important in stabilizing the fused granules, they may play a contractile role and promote expulsion of granule content and finally may be important in endocytosis. To elucidate these functions of F-actin remodelling requires a reliable method to visualize F-actin dynamics in living cells. The recent development of Lifeact-EGFP transgenic animals offers such an opportunity. Here, we studied the characteristics of exocytosis in pancreatic acinar cells obtained from the Lifeact-EGFP transgenic mice. We show that the time-course of agonist-evoked exocytic events and the kinetics of each single exocytic event are the same for wild type and Lifeact-EGFP transgenic animals. We conclude that Lifeact-EGFP animals are a good model to study of exocytosis and reveal that F-actin coating is dependent on the de novo synthesis of F-actin and that development of actin polymerization occurs simultaneously in all regions of the granule. Our insights using the Lifeact-EGFP mice demonstrate that F-actin coating occurs after granule fusion and is a granule-wide event.
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|Item Type:||Journal Article|
|Keywords:||Ca2+, exocytosis, actin|
|Subjects:||Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000)|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health|
Current > Institutes > Institute of Health and Biomedical Innovation
|Copyright Owner:||Copyright 2012 The Authors|
|Deposited On:||02 Nov 2012 08:43|
|Last Modified:||21 Mar 2013 07:13|
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