The Beta-Tubulin Isotype TUBB6 Controls Microtubule and Actin Dynamics in Osteoclasts

Osteoclasts are bone resorbing cells that participate in the maintenance of bone health. Pathological increase in osteoclast activity causes bone loss, eventually resulting in osteoporosis. Actin cytoskeleton of osteoclasts organizes into a belt of podosomes, which sustains the bone resorption appar...

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Autores principales:	Justine Maurin, Anne Morel, David Guérit, Julien Cau, Serge Urbach, Anne Blangy, Guillaume Bompard
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	osteoclast tubulin isotype microtubule actin bone resorption GRAF2 Biology (General) QH301-705.5
Acceso en línea:	https://doaj.org/article/0a9f88f193f6499097d2d7155cc4004e
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spelling	oai:doaj.org-article:0a9f88f193f6499097d2d7155cc4004e2021-11-18T09:52:13ZThe Beta-Tubulin Isotype TUBB6 Controls Microtubule and Actin Dynamics in Osteoclasts2296-634X10.3389/fcell.2021.778887https://doaj.org/article/0a9f88f193f6499097d2d7155cc4004e2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fcell.2021.778887/fullhttps://doaj.org/toc/2296-634XOsteoclasts are bone resorbing cells that participate in the maintenance of bone health. Pathological increase in osteoclast activity causes bone loss, eventually resulting in osteoporosis. Actin cytoskeleton of osteoclasts organizes into a belt of podosomes, which sustains the bone resorption apparatus and is maintained by microtubules. Better understanding of the molecular mechanisms regulating osteoclast cytoskeleton is key to understand the mechanisms of bone resorption, in particular to propose new strategies against osteoporosis. We reported recently that β-tubulin isotype TUBB6 is key for cytoskeleton organization in osteoclasts and for bone resorption. Here, using an osteoclast model CRISPR/Cas9 KO for Tubb6, we show that TUBB6 controls both microtubule and actin dynamics in osteoclasts. Osteoclasts KO for Tubb6 have reduced microtubule growth speed with longer growth life time, higher levels of acetylation, and smaller EB1-caps. On the other hand, lack of TUBB6 increases podosome life time while the belt of podosomes is destabilized. Finally, we performed proteomic analyses of osteoclast microtubule-associated protein enriched fractions. This highlighted ARHGAP10 as a new microtubule-associated protein, which binding to microtubules appears to be negatively regulated by TUBB6. ARHGAP10 is a negative regulator of CDC42 activity, which participates in actin organization in osteoclasts. Our results suggest that TUBB6 plays a key role in the control of microtubule and actin cytoskeleton dynamics in osteoclasts. Moreover, by controlling ARHGAP10 association with microtubules, TUBB6 may participate in the local control of CDC42 activity to ensure efficient bone resorption.Justine MaurinAnne MorelDavid GuéritJulien CauSerge UrbachAnne BlangyGuillaume BompardFrontiers Media S.A.articleosteoclasttubulin isotypemicrotubuleactinbone resorptionGRAF2Biology (General)QH301-705.5ENFrontiers in Cell and Developmental Biology, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	osteoclast tubulin isotype microtubule actin bone resorption GRAF2 Biology (General) QH301-705.5
spellingShingle	osteoclast tubulin isotype microtubule actin bone resorption GRAF2 Biology (General) QH301-705.5 Justine Maurin Anne Morel David Guérit Julien Cau Serge Urbach Anne Blangy Guillaume Bompard The Beta-Tubulin Isotype TUBB6 Controls Microtubule and Actin Dynamics in Osteoclasts
description	Osteoclasts are bone resorbing cells that participate in the maintenance of bone health. Pathological increase in osteoclast activity causes bone loss, eventually resulting in osteoporosis. Actin cytoskeleton of osteoclasts organizes into a belt of podosomes, which sustains the bone resorption apparatus and is maintained by microtubules. Better understanding of the molecular mechanisms regulating osteoclast cytoskeleton is key to understand the mechanisms of bone resorption, in particular to propose new strategies against osteoporosis. We reported recently that β-tubulin isotype TUBB6 is key for cytoskeleton organization in osteoclasts and for bone resorption. Here, using an osteoclast model CRISPR/Cas9 KO for Tubb6, we show that TUBB6 controls both microtubule and actin dynamics in osteoclasts. Osteoclasts KO for Tubb6 have reduced microtubule growth speed with longer growth life time, higher levels of acetylation, and smaller EB1-caps. On the other hand, lack of TUBB6 increases podosome life time while the belt of podosomes is destabilized. Finally, we performed proteomic analyses of osteoclast microtubule-associated protein enriched fractions. This highlighted ARHGAP10 as a new microtubule-associated protein, which binding to microtubules appears to be negatively regulated by TUBB6. ARHGAP10 is a negative regulator of CDC42 activity, which participates in actin organization in osteoclasts. Our results suggest that TUBB6 plays a key role in the control of microtubule and actin cytoskeleton dynamics in osteoclasts. Moreover, by controlling ARHGAP10 association with microtubules, TUBB6 may participate in the local control of CDC42 activity to ensure efficient bone resorption.
format	article
author	Justine Maurin Anne Morel David Guérit Julien Cau Serge Urbach Anne Blangy Guillaume Bompard
author_facet	Justine Maurin Anne Morel David Guérit Julien Cau Serge Urbach Anne Blangy Guillaume Bompard
author_sort	Justine Maurin
title	The Beta-Tubulin Isotype TUBB6 Controls Microtubule and Actin Dynamics in Osteoclasts
title_short	The Beta-Tubulin Isotype TUBB6 Controls Microtubule and Actin Dynamics in Osteoclasts
title_full	The Beta-Tubulin Isotype TUBB6 Controls Microtubule and Actin Dynamics in Osteoclasts
title_fullStr	The Beta-Tubulin Isotype TUBB6 Controls Microtubule and Actin Dynamics in Osteoclasts
title_full_unstemmed	The Beta-Tubulin Isotype TUBB6 Controls Microtubule and Actin Dynamics in Osteoclasts
title_sort	beta-tubulin isotype tubb6 controls microtubule and actin dynamics in osteoclasts
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/0a9f88f193f6499097d2d7155cc4004e
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The Beta-Tubulin Isotype TUBB6 Controls Microtubule and Actin Dynamics in Osteoclasts

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