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Cyclin-dependent kinase inhibitor p21 does not impact embryonic endochondral ossification in mice

Endochondral ossification at the growth plate is regulated by a number of factors and hormones. The cyclin-dependent kinase inhibitor p21 has been identified as a cell cycle regulator and its expression has been reported to be essential for endochondral ossification in vitro. However, to the best of...

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Autores principales: CHINZEI, NOBUAKI, HAYASHI, SHINYA, HASHIMOTO, SHINGO, KANZAKI, NORIYUKI, IWASA, KENJIRO, SAKATA, SHUHEI, KIHARA, SHINSUKE, FUJISHIRO, TAKAAKI, KURODA, RYOSUKE, KUROSAKA, MASAHIRO
Formato: Online Artículo Texto
Lenguaje:English
Publicado: D.A. Spandidos 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4270329/
https://www.ncbi.nlm.nih.gov/pubmed/25376471
http://dx.doi.org/10.3892/mmr.2014.2889
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author CHINZEI, NOBUAKI
HAYASHI, SHINYA
HASHIMOTO, SHINGO
KANZAKI, NORIYUKI
IWASA, KENJIRO
SAKATA, SHUHEI
KIHARA, SHINSUKE
FUJISHIRO, TAKAAKI
KURODA, RYOSUKE
KUROSAKA, MASAHIRO
author_facet CHINZEI, NOBUAKI
HAYASHI, SHINYA
HASHIMOTO, SHINGO
KANZAKI, NORIYUKI
IWASA, KENJIRO
SAKATA, SHUHEI
KIHARA, SHINSUKE
FUJISHIRO, TAKAAKI
KURODA, RYOSUKE
KUROSAKA, MASAHIRO
author_sort CHINZEI, NOBUAKI
collection PubMed
description Endochondral ossification at the growth plate is regulated by a number of factors and hormones. The cyclin-dependent kinase inhibitor p21 has been identified as a cell cycle regulator and its expression has been reported to be essential for endochondral ossification in vitro. However, to the best of our knowledge, the function of p21 in endochondral ossification has not been evaluated in vivo. Therefore, the aim of this study was to investigate the function of p21 in embryonic endochondral ossification in vivo. Wild-type (WT) and p21 knockout (KO) pregnant heterozygous mice were sacrificed on embryonic days E13.5, E15.5 and E18.5. Sagittal histological sections of the forearms of the embryos were collected and stained with Safranin O and 5-bromo-2′-deoxyuridine (BrdU). Additionally, the expression levels of cyclin D1, type II collagen, type X collagen, Sox9, and p16 were examined using immunohistochemistry, and the expression levels of p27 were examined using immunofluorescence. Safranin O staining revealed no structural change between the cartilage tissues of the WT and p21KO mice at any time point. Type II collagen was expressed ubiquitously, while type X collagen was only expressed in the hypertrophic zone of the cartilage tissues. No differences in the levels of Sox9 expression were observed between the two groups at any time point. The levels of cyclin D1 expression and BrdU uptake were higher in the E13.5 cartilage tissue compared with those observed in the embryonic cartilage tissue at subsequent time points. Expression of p16 and p27 was ubiquitous throughout the tissue sections. These results indicate that p21 may not be essential for embryonic endochondral ossification in articular cartilage of mice and that other signaling networks may compensate for p21 deletion.
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spelling pubmed-42703292014-12-19 Cyclin-dependent kinase inhibitor p21 does not impact embryonic endochondral ossification in mice CHINZEI, NOBUAKI HAYASHI, SHINYA HASHIMOTO, SHINGO KANZAKI, NORIYUKI IWASA, KENJIRO SAKATA, SHUHEI KIHARA, SHINSUKE FUJISHIRO, TAKAAKI KURODA, RYOSUKE KUROSAKA, MASAHIRO Mol Med Rep Articles Endochondral ossification at the growth plate is regulated by a number of factors and hormones. The cyclin-dependent kinase inhibitor p21 has been identified as a cell cycle regulator and its expression has been reported to be essential for endochondral ossification in vitro. However, to the best of our knowledge, the function of p21 in endochondral ossification has not been evaluated in vivo. Therefore, the aim of this study was to investigate the function of p21 in embryonic endochondral ossification in vivo. Wild-type (WT) and p21 knockout (KO) pregnant heterozygous mice were sacrificed on embryonic days E13.5, E15.5 and E18.5. Sagittal histological sections of the forearms of the embryos were collected and stained with Safranin O and 5-bromo-2′-deoxyuridine (BrdU). Additionally, the expression levels of cyclin D1, type II collagen, type X collagen, Sox9, and p16 were examined using immunohistochemistry, and the expression levels of p27 were examined using immunofluorescence. Safranin O staining revealed no structural change between the cartilage tissues of the WT and p21KO mice at any time point. Type II collagen was expressed ubiquitously, while type X collagen was only expressed in the hypertrophic zone of the cartilage tissues. No differences in the levels of Sox9 expression were observed between the two groups at any time point. The levels of cyclin D1 expression and BrdU uptake were higher in the E13.5 cartilage tissue compared with those observed in the embryonic cartilage tissue at subsequent time points. Expression of p16 and p27 was ubiquitous throughout the tissue sections. These results indicate that p21 may not be essential for embryonic endochondral ossification in articular cartilage of mice and that other signaling networks may compensate for p21 deletion. D.A. Spandidos 2015-03 2014-11-06 /pmc/articles/PMC4270329/ /pubmed/25376471 http://dx.doi.org/10.3892/mmr.2014.2889 Text en Copyright © 2015, Spandidos Publications http://creativecommons.org/licenses/by/3.0 This is an open-access article licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. The article may be redistributed, reproduced, and reused for non-commercial purposes, provided the original source is properly cited.
spellingShingle Articles
CHINZEI, NOBUAKI
HAYASHI, SHINYA
HASHIMOTO, SHINGO
KANZAKI, NORIYUKI
IWASA, KENJIRO
SAKATA, SHUHEI
KIHARA, SHINSUKE
FUJISHIRO, TAKAAKI
KURODA, RYOSUKE
KUROSAKA, MASAHIRO
Cyclin-dependent kinase inhibitor p21 does not impact embryonic endochondral ossification in mice
title Cyclin-dependent kinase inhibitor p21 does not impact embryonic endochondral ossification in mice
title_full Cyclin-dependent kinase inhibitor p21 does not impact embryonic endochondral ossification in mice
title_fullStr Cyclin-dependent kinase inhibitor p21 does not impact embryonic endochondral ossification in mice
title_full_unstemmed Cyclin-dependent kinase inhibitor p21 does not impact embryonic endochondral ossification in mice
title_short Cyclin-dependent kinase inhibitor p21 does not impact embryonic endochondral ossification in mice
title_sort cyclin-dependent kinase inhibitor p21 does not impact embryonic endochondral ossification in mice
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4270329/
https://www.ncbi.nlm.nih.gov/pubmed/25376471
http://dx.doi.org/10.3892/mmr.2014.2889
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