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Mlck1a is expressed in zebrafish thrombocytes and is an essential component of thrombus formation

Tournoij, E. and Weber, G. J. and Akkerman, J. W. and Groot de, P. G. and Zon, L. and Moll, F. L. and Schulte-Merker, S. (2010) Mlck1a is expressed in zebrafish thrombocytes and is an essential component of thrombus formation. Journal of Thrombosis and Haemostasis, 8, 588-95. ISSN 1538-7933.

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BACKGROUND: We have used the advantages of the zebrafish model system to demonstrate which of the vertebrate myosin light chain kinase (MLCK) genes is expressed in thrombocytes and important for thrombus formation. METHODS AND RESULTS: Here we report that Mlck1a is an essential component of thrombus formation. Phylogenetic data revealed four zebrafish orthologous for three human MLCK genes. To investigate expression of the zebrafish mlck genes in thrombocytes we compared GFP-tagged platelets with other cells by microarray analysis, and showed that mlck1a expression was 4.5-fold enriched in platelets. Furthermore, mlck1a mRNA and mRNA for the platelet-specific cd41 co-localized in thrombi. Expression of other mlck subtypes was lower in GFP-tagged platelets (mlck1b; 0.77-fold enriched) and absent in thrombi (mlck1b, -2, -3). To investigate the role of Mlck1a in thrombus formation, we knocked down mlck1a using two morpholinos. This resulted in impaired morphology changes of platelets adhering on fibrinogen. In a thrombosis model, in which thrombocytes adhere to the vessel wall damaged by laser irradiation, thrombus formation was slowed down in mlck1a-deficient embryos. CONCLUSION: We conclude that Mlck1a is the subtype of MLCK that contributes to platelet shape change and thrombus formation.

Item Type:Article
Institutes:Hubrecht Instituut
ID Code:9475
Deposited On:04 Jan 2011 01:00
Last Modified:07 Sep 2011 17:01

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