γ-Actin plays a key role in endothelial cell motility and neovessel maintenance
Identifieur interne : 002281 ( Ncbi/Curation ); précédent : 002280; suivant : 002282γ-Actin plays a key role in endothelial cell motility and neovessel maintenance
Auteurs : Eddy Pasquier [Australie, France] ; Maria-Pia Tuset [Australie] ; Snega Sinnappan [Australie] ; Michael Carnell [Australie] ; Alexander Macmillan [Australie] ; Maria Kavallaris [Australie]Source :
- Vascular Cell [ 2045-824X ] ; 2015.
Abstract
Angiogenesis plays a crucial role in development, wound healing as well as tumour growth and metastasis. Although the general implication of the cytoskeleton in angiogenesis has been partially unravelled, little is known about the specific role of actin isoforms in this process. Herein, we aimed at deciphering the function of γ-actin in angiogenesis.
Localization of β- and γ-actin in vascular endothelial cells was investigated by co-immunofluorescence staining using monoclonal antibodies, followed by the functional analysis of γ-actin using siRNA. The impact of γ-actin knockdown on the random motility and morphological differentiation of endothelial cells into vascular networks was investigated by timelapse videomicroscopy while the effect on chemotaxis was assessed using modified Boyden chambers. The implication of VE-cadherin, VEGFR-2 and ROCK signalling was then examined by Western blotting and using pharmacological inhibitors.
The two main cytoplasmic isoforms of actin strongly co-localized in vascular endothelial cells, albeit with some degree of spatial preference. While β-actin knockdown was not achievable without major cytotoxicity, γ-actin knockdown did not alter the viability of endothelial cells. Timelapse videomicroscopy experiments revealed that γ-actin knockdown cells were able to initiate morphological differentiation into capillary-like tubes but were unable to maintain these structures, which rapidly regressed. This vascular regression was associated with altered regulation of VE-cadherin expression. Interestingly, knocking down γ-actin expression had no effect on endothelial cell adhesion to various substrates but significantly decreased their motility and migration. This anti-migratory effect was associated with an accumulation of thick actin stress fibres, large focal adhesions and increased phosphorylation of myosin regulatory light chain, suggesting activation of the ROCK signalling pathway. Incubation with ROCK inhibitors, H-1152 and Y-27632, completely rescued the motility phenotype induced by γ-actin knockdown but only partially restored the angiogenic potential of endothelial cells.
Our study thus demonstrates for the first time that β-actin is essential for endothelial cell survival and γ-actin plays a crucial role in angiogenesis, through both ROCK-dependent and -independent mechanisms. This provides new insights into the role of the actin cytoskeleton in angiogenesis and may open new therapeutic avenues for the treatment of angiogenesis-related disorders.
The online version of this article (doi:10.1186/s13221-014-0027-2) contains supplementary material, which is available to authorized users.
Url:
DOI: 10.1186/s13221-014-0027-2
PubMed: 25705373
PubMed Central: 4335457
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Box 81, 2031 Randwick, NSW Australia</nlm:aff><country>Australie</country><placeName><region type="state">Nouvelle-Galles du Sud</region></placeName><wicri:cityArea>Tumour Biology and Targeting Program, Children’s Cancer Institute Australia, Lowy Cancer Research Centre, University of New South Wales, P.O. Box 81, 2031 Randwick</wicri:cityArea></affiliation><affiliation wicri:level="3"><nlm:aff id="Aff2">Metronomics Global Health Initiative, Marseille, France</nlm:aff><country xml:lang="fr">France</country><wicri:regionArea>Metronomics Global Health Initiative, Marseille</wicri:regionArea><placeName><region type="region">Provence-Alpes-Côte d'Azur</region><region type="old region">Provence-Alpes-Côte d'Azur</region><settlement type="city">Marseille</settlement></placeName></affiliation></author><author><name sortKey="Tuset, Maria Pia" sort="Tuset, Maria Pia" uniqKey="Tuset M" first="Maria-Pia" last="Tuset">Maria-Pia Tuset</name><affiliation wicri:level="2"><nlm:aff id="Aff1">Tumour Biology and Targeting Program, Children’s Cancer Institute Australia, Lowy Cancer Research Centre, University of New South Wales, P.O. Box 81, 2031 Randwick, NSW Australia</nlm:aff><country>Australie</country><placeName><region type="state">Nouvelle-Galles du Sud</region></placeName><wicri:cityArea>Tumour Biology and Targeting Program, Children’s Cancer Institute Australia, Lowy Cancer Research Centre, University of New South Wales, P.O. Box 81, 2031 Randwick</wicri:cityArea></affiliation></author><author><name sortKey="Sinnappan, Snega" sort="Sinnappan, Snega" uniqKey="Sinnappan S" first="Snega" last="Sinnappan">Snega Sinnappan</name><affiliation wicri:level="2"><nlm:aff id="Aff1">Tumour Biology and Targeting Program, Children’s Cancer Institute Australia, Lowy Cancer Research Centre, University of New South Wales, P.O. Box 81, 2031 Randwick, NSW Australia</nlm:aff><country>Australie</country><placeName><region type="state">Nouvelle-Galles du Sud</region></placeName><wicri:cityArea>Tumour Biology and Targeting Program, Children’s Cancer Institute Australia, Lowy Cancer Research Centre, University of New South Wales, P.O. Box 81, 2031 Randwick</wicri:cityArea></affiliation><affiliation wicri:level="2"><nlm:aff id="Aff5">Current address: Kolling Institute of Medical Research, Royal North Shore Hospital, 2065 St Leonards, NSW Australia</nlm:aff><country>Australie</country><placeName><region type="state">Nouvelle-Galles du Sud</region></placeName><wicri:cityArea>Current address: Kolling Institute of Medical Research, Royal North Shore Hospital, 2065 St Leonards</wicri:cityArea></affiliation></author><author><name sortKey="Carnell, Michael" sort="Carnell, Michael" uniqKey="Carnell M" first="Michael" last="Carnell">Michael Carnell</name><affiliation wicri:level="3"><nlm:aff id="Aff3">Biomedical Imaging Facility, UNSW, Sydney, Australia</nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea>Biomedical Imaging Facility, UNSW, Sydney</wicri:regionArea><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author><author><name sortKey="Macmillan, Alexander" sort="Macmillan, Alexander" uniqKey="Macmillan A" first="Alexander" last="Macmillan">Alexander Macmillan</name><affiliation wicri:level="3"><nlm:aff id="Aff3">Biomedical Imaging Facility, UNSW, Sydney, Australia</nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea>Biomedical Imaging Facility, UNSW, Sydney</wicri:regionArea><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author><author><name sortKey="Kavallaris, Maria" sort="Kavallaris, Maria" uniqKey="Kavallaris M" first="Maria" last="Kavallaris">Maria Kavallaris</name><affiliation wicri:level="2"><nlm:aff id="Aff1">Tumour Biology and Targeting Program, Children’s Cancer Institute Australia, Lowy Cancer Research Centre, University of New South Wales, P.O. Box 81, 2031 Randwick, NSW Australia</nlm:aff><country>Australie</country><placeName><region type="state">Nouvelle-Galles du Sud</region></placeName><wicri:cityArea>Tumour Biology and Targeting Program, Children’s Cancer Institute Australia, Lowy Cancer Research Centre, University of New South Wales, P.O. Box 81, 2031 Randwick</wicri:cityArea></affiliation><affiliation wicri:level="3"><nlm:aff id="Aff4">Australian Centre for Nanomedicine, UNSW, Sydney, Australia</nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea>Australian Centre for Nanomedicine, UNSW, Sydney</wicri:regionArea><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author></analytic><series><title level="j">Vascular Cell</title><idno type="eISSN">2045-824X</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Background</title><p>Angiogenesis plays a crucial role in development, wound healing as well as tumour growth and metastasis. Although the general implication of the cytoskeleton in angiogenesis has been partially unravelled, little is known about the specific role of actin isoforms in this process. Herein, we aimed at deciphering the function of γ-actin in angiogenesis.</p></sec><sec><title>Methods</title><p>Localization of β- and γ-actin in vascular endothelial cells was investigated by co-immunofluorescence staining using monoclonal antibodies, followed by the functional analysis of γ-actin using siRNA. The impact of γ-actin knockdown on the random motility and morphological differentiation of endothelial cells into vascular networks was investigated by timelapse videomicroscopy while the effect on chemotaxis was assessed using modified Boyden chambers. The implication of VE-cadherin, VEGFR-2 and ROCK signalling was then examined by Western blotting and using pharmacological inhibitors.</p></sec><sec><title>Results</title><p>The two main cytoplasmic isoforms of actin strongly co-localized in vascular endothelial cells, albeit with some degree of spatial preference. While β-actin knockdown was not achievable without major cytotoxicity, γ-actin knockdown did not alter the viability of endothelial cells. Timelapse videomicroscopy experiments revealed that γ-actin knockdown cells were able to initiate morphological differentiation into capillary-like tubes but were unable to maintain these structures, which rapidly regressed. This vascular regression was associated with altered regulation of VE-cadherin expression. Interestingly, knocking down γ-actin expression had no effect on endothelial cell adhesion to various substrates but significantly decreased their motility and migration. This anti-migratory effect was associated with an accumulation of thick actin stress fibres, large focal adhesions and increased phosphorylation of myosin regulatory light chain, suggesting activation of the ROCK signalling pathway. Incubation with ROCK inhibitors, H-1152 and Y-27632, completely rescued the motility phenotype induced by γ-actin knockdown but only partially restored the angiogenic potential of endothelial cells.</p></sec><sec><title>Conclusions</title><p>Our study thus demonstrates for the first time that β-actin is essential for endothelial cell survival and γ-actin plays a crucial role in angiogenesis, through both ROCK-dependent and -independent mechanisms. This provides new insights into the role of the actin cytoskeleton in angiogenesis and may open new therapeutic avenues for the treatment of angiogenesis-related disorders.</p></sec><sec><title>Electronic supplementary material</title><p>The online version of this article (doi:10.1186/s13221-014-0027-2) contains supplementary material, which is available to authorized users.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Carmeliet, P" uniqKey="Carmeliet P">P Carmeliet</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ferrara, N" uniqKey="Ferrara N">N Ferrara</name></author><author><name sortKey="Kerbel, Rs" uniqKey="Kerbel R">RS Kerbel</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Pasquier, E" uniqKey="Pasquier E">E Pasquier</name></author><author><name sortKey="Andre, N" uniqKey="Andre N">N Andre</name></author><author><name sortKey="Braguer, D" 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