Tropomyosin isoform modulation of focal adhesion structure and cell migration
Orderly cell migration is essential for embryonic development, efficient wound healing and a functioning immune system and the dysregulation of this process leads to a number of pathologies. The speed and direction of cell migration is critically dependent on the structural organization of focal adh...
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Published in | Cell adhesion & migration Vol. 4; no. 2; pp. 226 - 234 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
United States
Taylor & Francis
01.04.2010
Landes Bioscience |
Subjects | |
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Abstract | Orderly cell migration is essential for embryonic development, efficient wound healing and a functioning immune system and the dysregulation of this process leads to a number of pathologies. The speed and direction of cell migration is critically dependent on the structural organization of focal adhesions in the cell. While it is well established that contractile forces derived from the acto-myosin filaments control the structure and growth of focal adhesions, how this may be modulated to give different outcomes for speed and persistence is not well understood. The tropomyosin family of actin-associating proteins are emerging as important modulators of the contractile nature of associated actin filaments. The multiple non-muscle tropomyosin isoforms are differentially expressed between tissues and across development and are thought to be major regulators of actin filament functional specialization. In the present study we have investigated the effects of two splice variant isoforms from the same α-tropomyosin gene, TmBr1 and TmBr3, on focal adhesion structure and parameters of cell migration. These isoforms are normally switched on in neuronal cells during differentiation and we find that exogenous expression of the two isoforms in undifferentiated neuronal cells has discrete effects on cell migration parameters. While both isoforms cause reduced focal adhesion size and cell migration speed, they differentially effect actin filament phenotypes and migration persistence. Our data suggests that differential expression of tropomyosin isoforms may coordinate acto-myosin contractility and focal adhesion structure to modulate cell speed and persistence. |
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AbstractList | Orderly cell migration is essential for embryonic development, efficient wound healing and a functioning immune system and the dysregulation of this process leads to a number of pathologies. The speed and direction of cell migration is critically dependent on the structural organization of focal adhesions in the cell. While it is well established that contractile forces derived from the acto-myosin filaments control the structure and growth of focal adhesions, how this may be modulated to give different outcomes for speed and persistence is not well understood. The tropomyosin family of actin-associating proteins are emerging as important modulators of the contractile nature of associated actin filaments. The multiple non-muscle tropomyosin isoforms are differentially expressed between tissues and across development and are thought to be major regulators of actin filament functional specialization. In the present study we have investigated the effects of two splice variant isoforms from the same α-tropomyosin gene, TmBr1 and TmBr3, on focal adhesion structure and parameters of cell migration. These isoforms are normally switched on in neuronal cells during differentiation and we find that exogenous expression of the two isoforms in undifferentiated neuronal cells has discrete effects on cell migration parameters. While both isoforms cause reduced focal adhesion size and cell migration speed, they differentially effect actin filament phenotypes and migration persistence. Our data suggests that differential expression of tropomyosin isoforms may coordinate acto-myosin contractility and focal adhesion structure to modulate cell speed and persistence. Orderly cell migration is essential for embryonic development, efficient wound healing and a functioning immune system and the dysregulation of this process leads to a number of pathologies. The speed and direction of cell migration is critically dependent on the structural organization of focal adhesions in the cell. While it is well established that contractile forces derived from the acto-myosin filaments control the structure and growth of focal adhesions, how this may be modulated to give different outcomes for speed and persistence is not well understood. The tropomyosin family of actin-associating proteins are emerging as important modulators of the contractile nature of associated actin filaments. The multiple non-muscle tropomyosin isoforms are differentially expressed between tissues and across development and are thought to be major regulators of actin filament functional specialization. In the present study we have investigated the effects of two splice variant isoforms from the same alpha-tropomyosin gene, TmBr1 and TmBr3, on focal adhesion structure and parameters of cell migration. These isoforms are normally switched on in neuronal cells during differentiation and we find that exogenous expression of the two isoforms in undifferentiated neuronal cells has discrete effects on cell migration parameters. While both isoforms cause reduced focal adhesion size and cell migration speed, they differentially effect actin filament phenotypes and migration persistence. Our data suggests that differential expression of tropomyosin isoforms may coordinate acto-myosin contractility and focal adhesion structure to modulate cell speed and persistence. |
Author | Schevzov, Galina Gunning, Peter W. Bach, Cuc T.T. O'Neill, Geraldine M. Bryce, Nicole S. |
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Title | Tropomyosin isoform modulation of focal adhesion structure and cell migration |
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