Mice with myocyte deletion of vitamin D receptor have sarcopenia and impaired muscle function

Background It has long been recognized that vitamin D deficiency is associated with muscle weakness and falls. Vitamin D receptor (VDR) is present at very low levels in normal muscle. Whether vitamin D plays a direct role in muscle function is unknown and is a subject of hot debate. Myocyte‐specific...

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Published inJournal of cachexia, sarcopenia and muscle Vol. 10; no. 6; pp. 1228 - 1240
Main Authors Girgis, Christian M., Cha, Kuan Minn, So, Benjamin, Tsang, Michael, Chen, Jennifer, Houweling, Peter J., Schindeler, Aaron, Stokes, Rebecca, Swarbrick, Michael M., Evesson, Frances J., Cooper, Sandra T., Gunton, Jenny E.
Format Journal Article
LanguageEnglish
Published Germany John Wiley & Sons, Inc 01.12.2019
John Wiley and Sons Inc
Wiley
Subjects
Online AccessGet full text
ISSN2190-5991
2190-6009
2190-6009
DOI10.1002/jcsm.12460

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Abstract Background It has long been recognized that vitamin D deficiency is associated with muscle weakness and falls. Vitamin D receptor (VDR) is present at very low levels in normal muscle. Whether vitamin D plays a direct role in muscle function is unknown and is a subject of hot debate. Myocyte‐specific deletion of VDR would provide a strategy to answer this question. Methods Myocyte‐specific vitamin D receptor (mVDR) null mice were generated by crossing human skeletal actin‐Cre mice with floxed VDR mice. The effects of gene deletion on the muscle phenotype were studied in terms of body tissue composition, muscle tissue histology, and gene expression by real‐time PCR. Results Unlike whole‐body VDR knockout mice, mVDR mice showed a normal body size. The mVDR showed a distinct muscle phenotype featuring reduced proportional lean mass (70% vs. 78% of lean mass), reduced voluntary wheel‐running distance (22% decrease, P = 0.009), reduced average running speed, and reduced grip strength (7–16% reduction depending on age at testing). With their decreased voluntary exercise, and decreased lean mass, mVDR have increased proportional fat mass at 20% compared with 13%. Surprisingly, their muscle fibres showed slightly increased diameter, as well as the presence of angular fibres and central nuclei suggesting ongoing remodelling. There were, however, no clear changes in fibre type and there was no increase in muscle fibrosis. VDR is a transcriptional regulator, and changes in the expression of candidate genes was examined in RNA extracted from skeletal muscle. Alterations were seen in myogenic gene expression, and there was decreased expression of cell cycle genes cyclin D1, D2, and D3 and cyclin‐dependent kinases Cdk‐2 and Cdk‐4. Expression of calcium handling genes sarcoplasmic/endoplasmic reticulum calcium ATPases (SERCA) Serca2b and Serca3 was decreased and Calbindin mRNA was lower in mVDR muscle. Conclusions This study demonstrates that vitamin D signalling is needed for myocyte function. Despite the low level of VDR protein normally found muscle, deleting myocyte VDR had important effects on muscle size and strength. Maintenance of normal vitamin D signalling is a useful strategy to prevent loss of muscle function and size.
AbstractList BackgroundIt has long been recognized that vitamin D deficiency is associated with muscle weakness and falls. Vitamin D receptor (VDR) is present at very low levels in normal muscle. Whether vitamin D plays a direct role in muscle function is unknown and is a subject of hot debate. Myocyte‐specific deletion of VDR would provide a strategy to answer this question.MethodsMyocyte‐specific vitamin D receptor (mVDR) null mice were generated by crossing human skeletal actin‐Cre mice with floxed VDR mice. The effects of gene deletion on the muscle phenotype were studied in terms of body tissue composition, muscle tissue histology, and gene expression by real‐time PCR.ResultsUnlike whole‐body VDR knockout mice, mVDR mice showed a normal body size. The mVDR showed a distinct muscle phenotype featuring reduced proportional lean mass (70% vs. 78% of lean mass), reduced voluntary wheel‐running distance (22% decrease, P = 0.009), reduced average running speed, and reduced grip strength (7–16% reduction depending on age at testing). With their decreased voluntary exercise, and decreased lean mass, mVDR have increased proportional fat mass at 20% compared with 13%.Surprisingly, their muscle fibres showed slightly increased diameter, as well as the presence of angular fibres and central nuclei suggesting ongoing remodelling. There were, however, no clear changes in fibre type and there was no increase in muscle fibrosis. VDR is a transcriptional regulator, and changes in the expression of candidate genes was examined in RNA extracted from skeletal muscle. Alterations were seen in myogenic gene expression, and there was decreased expression of cell cycle genes cyclin D1, D2, and D3 and cyclin‐dependent kinases Cdk‐2 and Cdk‐4. Expression of calcium handling genes sarcoplasmic/endoplasmic reticulum calcium ATPases (SERCA) Serca2b and Serca3 was decreased and Calbindin mRNA was lower in mVDR muscle.ConclusionsThis study demonstrates that vitamin D signalling is needed for myocyte function. Despite the low level of VDR protein normally found muscle, deleting myocyte VDR had important effects on muscle size and strength. Maintenance of normal vitamin D signalling is a useful strategy to prevent loss of muscle function and size.
It has long been recognized that vitamin D deficiency is associated with muscle weakness and falls. Vitamin D receptor (VDR) is present at very low levels in normal muscle. Whether vitamin D plays a direct role in muscle function is unknown and is a subject of hot debate. Myocyte-specific deletion of VDR would provide a strategy to answer this question.BACKGROUNDIt has long been recognized that vitamin D deficiency is associated with muscle weakness and falls. Vitamin D receptor (VDR) is present at very low levels in normal muscle. Whether vitamin D plays a direct role in muscle function is unknown and is a subject of hot debate. Myocyte-specific deletion of VDR would provide a strategy to answer this question.Myocyte-specific vitamin D receptor (mVDR) null mice were generated by crossing human skeletal actin-Cre mice with floxed VDR mice. The effects of gene deletion on the muscle phenotype were studied in terms of body tissue composition, muscle tissue histology, and gene expression by real-time PCR.METHODSMyocyte-specific vitamin D receptor (mVDR) null mice were generated by crossing human skeletal actin-Cre mice with floxed VDR mice. The effects of gene deletion on the muscle phenotype were studied in terms of body tissue composition, muscle tissue histology, and gene expression by real-time PCR.Unlike whole-body VDR knockout mice, mVDR mice showed a normal body size. The mVDR showed a distinct muscle phenotype featuring reduced proportional lean mass (70% vs. 78% of lean mass), reduced voluntary wheel-running distance (22% decrease, P = 0.009), reduced average running speed, and reduced grip strength (7-16% reduction depending on age at testing). With their decreased voluntary exercise, and decreased lean mass, mVDR have increased proportional fat mass at 20% compared with 13%. Surprisingly, their muscle fibres showed slightly increased diameter, as well as the presence of angular fibres and central nuclei suggesting ongoing remodelling. There were, however, no clear changes in fibre type and there was no increase in muscle fibrosis. VDR is a transcriptional regulator, and changes in the expression of candidate genes was examined in RNA extracted from skeletal muscle. Alterations were seen in myogenic gene expression, and there was decreased expression of cell cycle genes cyclin D1, D2, and D3 and cyclin-dependent kinases Cdk-2 and Cdk-4. Expression of calcium handling genes sarcoplasmic/endoplasmic reticulum calcium ATPases (SERCA) Serca2b and Serca3 was decreased and Calbindin mRNA was lower in mVDR muscle.RESULTSUnlike whole-body VDR knockout mice, mVDR mice showed a normal body size. The mVDR showed a distinct muscle phenotype featuring reduced proportional lean mass (70% vs. 78% of lean mass), reduced voluntary wheel-running distance (22% decrease, P = 0.009), reduced average running speed, and reduced grip strength (7-16% reduction depending on age at testing). With their decreased voluntary exercise, and decreased lean mass, mVDR have increased proportional fat mass at 20% compared with 13%. Surprisingly, their muscle fibres showed slightly increased diameter, as well as the presence of angular fibres and central nuclei suggesting ongoing remodelling. There were, however, no clear changes in fibre type and there was no increase in muscle fibrosis. VDR is a transcriptional regulator, and changes in the expression of candidate genes was examined in RNA extracted from skeletal muscle. Alterations were seen in myogenic gene expression, and there was decreased expression of cell cycle genes cyclin D1, D2, and D3 and cyclin-dependent kinases Cdk-2 and Cdk-4. Expression of calcium handling genes sarcoplasmic/endoplasmic reticulum calcium ATPases (SERCA) Serca2b and Serca3 was decreased and Calbindin mRNA was lower in mVDR muscle.This study demonstrates that vitamin D signalling is needed for myocyte function. Despite the low level of VDR protein normally found muscle, deleting myocyte VDR had important effects on muscle size and strength. Maintenance of normal vitamin D signalling is a useful strategy to prevent loss of muscle function and size.CONCLUSIONSThis study demonstrates that vitamin D signalling is needed for myocyte function. Despite the low level of VDR protein normally found muscle, deleting myocyte VDR had important effects on muscle size and strength. Maintenance of normal vitamin D signalling is a useful strategy to prevent loss of muscle function and size.
Abstract Background It has long been recognized that vitamin D deficiency is associated with muscle weakness and falls. Vitamin D receptor (VDR) is present at very low levels in normal muscle. Whether vitamin D plays a direct role in muscle function is unknown and is a subject of hot debate. Myocyte‐specific deletion of VDR would provide a strategy to answer this question. Methods Myocyte‐specific vitamin D receptor (mVDR) null mice were generated by crossing human skeletal actin‐Cre mice with floxed VDR mice. The effects of gene deletion on the muscle phenotype were studied in terms of body tissue composition, muscle tissue histology, and gene expression by real‐time PCR. Results Unlike whole‐body VDR knockout mice, mVDR mice showed a normal body size. The mVDR showed a distinct muscle phenotype featuring reduced proportional lean mass (70% vs. 78% of lean mass), reduced voluntary wheel‐running distance (22% decrease, P = 0.009), reduced average running speed, and reduced grip strength (7–16% reduction depending on age at testing). With their decreased voluntary exercise, and decreased lean mass, mVDR have increased proportional fat mass at 20% compared with 13%. Surprisingly, their muscle fibres showed slightly increased diameter, as well as the presence of angular fibres and central nuclei suggesting ongoing remodelling. There were, however, no clear changes in fibre type and there was no increase in muscle fibrosis. VDR is a transcriptional regulator, and changes in the expression of candidate genes was examined in RNA extracted from skeletal muscle. Alterations were seen in myogenic gene expression, and there was decreased expression of cell cycle genes cyclin D1, D2, and D3 and cyclin‐dependent kinases Cdk‐2 and Cdk‐4. Expression of calcium handling genes sarcoplasmic/endoplasmic reticulum calcium ATPases (SERCA) Serca2b and Serca3 was decreased and Calbindin mRNA was lower in mVDR muscle. Conclusions This study demonstrates that vitamin D signalling is needed for myocyte function. Despite the low level of VDR protein normally found muscle, deleting myocyte VDR had important effects on muscle size and strength. Maintenance of normal vitamin D signalling is a useful strategy to prevent loss of muscle function and size.
Background It has long been recognized that vitamin D deficiency is associated with muscle weakness and falls. Vitamin D receptor (VDR) is present at very low levels in normal muscle. Whether vitamin D plays a direct role in muscle function is unknown and is a subject of hot debate. Myocyte‐specific deletion of VDR would provide a strategy to answer this question. Methods Myocyte‐specific vitamin D receptor (mVDR) null mice were generated by crossing human skeletal actin‐Cre mice with floxed VDR mice. The effects of gene deletion on the muscle phenotype were studied in terms of body tissue composition, muscle tissue histology, and gene expression by real‐time PCR. Results Unlike whole‐body VDR knockout mice, mVDR mice showed a normal body size. The mVDR showed a distinct muscle phenotype featuring reduced proportional lean mass (70% vs. 78% of lean mass), reduced voluntary wheel‐running distance (22% decrease, P = 0.009), reduced average running speed, and reduced grip strength (7–16% reduction depending on age at testing). With their decreased voluntary exercise, and decreased lean mass, mVDR have increased proportional fat mass at 20% compared with 13%. Surprisingly, their muscle fibres showed slightly increased diameter, as well as the presence of angular fibres and central nuclei suggesting ongoing remodelling. There were, however, no clear changes in fibre type and there was no increase in muscle fibrosis. VDR is a transcriptional regulator, and changes in the expression of candidate genes was examined in RNA extracted from skeletal muscle. Alterations were seen in myogenic gene expression, and there was decreased expression of cell cycle genes cyclin D1, D2, and D3 and cyclin‐dependent kinases Cdk‐2 and Cdk‐4. Expression of calcium handling genes sarcoplasmic/endoplasmic reticulum calcium ATPases (SERCA) Serca2b and Serca3 was decreased and Calbindin mRNA was lower in mVDR muscle. Conclusions This study demonstrates that vitamin D signalling is needed for myocyte function. Despite the low level of VDR protein normally found muscle, deleting myocyte VDR had important effects on muscle size and strength. Maintenance of normal vitamin D signalling is a useful strategy to prevent loss of muscle function and size.
It has long been recognized that vitamin D deficiency is associated with muscle weakness and falls. Vitamin D receptor (VDR) is present at very low levels in normal muscle. Whether vitamin D plays a direct role in muscle function is unknown and is a subject of hot debate. Myocyte-specific deletion of VDR would provide a strategy to answer this question. Myocyte-specific vitamin D receptor (mVDR) null mice were generated by crossing human skeletal actin-Cre mice with floxed VDR mice. The effects of gene deletion on the muscle phenotype were studied in terms of body tissue composition, muscle tissue histology, and gene expression by real-time PCR. Unlike whole-body VDR knockout mice, mVDR mice showed a normal body size. The mVDR showed a distinct muscle phenotype featuring reduced proportional lean mass (70% vs. 78% of lean mass), reduced voluntary wheel-running distance (22% decrease, P = 0.009), reduced average running speed, and reduced grip strength (7-16% reduction depending on age at testing). With their decreased voluntary exercise, and decreased lean mass, mVDR have increased proportional fat mass at 20% compared with 13%. Surprisingly, their muscle fibres showed slightly increased diameter, as well as the presence of angular fibres and central nuclei suggesting ongoing remodelling. There were, however, no clear changes in fibre type and there was no increase in muscle fibrosis. VDR is a transcriptional regulator, and changes in the expression of candidate genes was examined in RNA extracted from skeletal muscle. Alterations were seen in myogenic gene expression, and there was decreased expression of cell cycle genes cyclin D1, D2, and D3 and cyclin-dependent kinases Cdk-2 and Cdk-4. Expression of calcium handling genes sarcoplasmic/endoplasmic reticulum calcium ATPases (SERCA) Serca2b and Serca3 was decreased and Calbindin mRNA was lower in mVDR muscle. This study demonstrates that vitamin D signalling is needed for myocyte function. Despite the low level of VDR protein normally found muscle, deleting myocyte VDR had important effects on muscle size and strength. Maintenance of normal vitamin D signalling is a useful strategy to prevent loss of muscle function and size.
Author Schindeler, Aaron
Houweling, Peter J.
Tsang, Michael
Gunton, Jenny E.
Cha, Kuan Minn
Chen, Jennifer
Girgis, Christian M.
Cooper, Sandra T.
So, Benjamin
Stokes, Rebecca
Evesson, Frances J.
Swarbrick, Michael M.
AuthorAffiliation 4 Department of Diabetes and Endocrinology Royal North Shore Hospital St Leonards New South Wales Australia
6 Murdoch Children's Research Institute Royal Children's Hospital Melbourne Victoria Australia
7 Department of Paediatrics University of Melbourne Melbourne Victoria Australia
8 Orthopaedic Research and Biotechnology Unit The Children's Hospital at Westmead Sydney Westmead Australia
5 Faculty of Medicine University of New South Wales Sydney New South Wales Australia
10 Division of Immunology Garvan Institute of Medical Research Sydney New South Wales Australia
1 Department of Diabetes and Endocrinology Westmead Hospital Sydney New South Wales Australia
9 Kids Neuroscience Centre, The Children's Hospital at Westmead, The Discipline of Child and Adolescent Health, Children's Medical Research Institute The University of Sydney Sydney New South Wales Australia
2 Faculty of Health and Medicine The University of Sydney Sydney New South Wales Australia
3 The Westmead Institute for Medical Resear
AuthorAffiliation_xml – name: 6 Murdoch Children's Research Institute Royal Children's Hospital Melbourne Victoria Australia
– name: 2 Faculty of Health and Medicine The University of Sydney Sydney New South Wales Australia
– name: 3 The Westmead Institute for Medical Research The University of Sydney Sydney New South Wales Australia
– name: 5 Faculty of Medicine University of New South Wales Sydney New South Wales Australia
– name: 7 Department of Paediatrics University of Melbourne Melbourne Victoria Australia
– name: 4 Department of Diabetes and Endocrinology Royal North Shore Hospital St Leonards New South Wales Australia
– name: 8 Orthopaedic Research and Biotechnology Unit The Children's Hospital at Westmead Sydney Westmead Australia
– name: 10 Division of Immunology Garvan Institute of Medical Research Sydney New South Wales Australia
– name: 1 Department of Diabetes and Endocrinology Westmead Hospital Sydney New South Wales Australia
– name: 9 Kids Neuroscience Centre, The Children's Hospital at Westmead, The Discipline of Child and Adolescent Health, Children's Medical Research Institute The University of Sydney Sydney New South Wales Australia
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  surname: Girgis
  fullname: Girgis, Christian M.
  organization: Royal North Shore Hospital
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  givenname: Kuan Minn
  surname: Cha
  fullname: Cha, Kuan Minn
  organization: The University of Sydney
– sequence: 3
  givenname: Benjamin
  surname: So
  fullname: So, Benjamin
  organization: University of New South Wales
– sequence: 4
  givenname: Michael
  surname: Tsang
  fullname: Tsang, Michael
  organization: The University of Sydney
– sequence: 5
  givenname: Jennifer
  surname: Chen
  fullname: Chen, Jennifer
  organization: The University of Sydney
– sequence: 6
  givenname: Peter J.
  surname: Houweling
  fullname: Houweling, Peter J.
  organization: University of Melbourne
– sequence: 7
  givenname: Aaron
  surname: Schindeler
  fullname: Schindeler, Aaron
  organization: The Children's Hospital at Westmead
– sequence: 8
  givenname: Rebecca
  surname: Stokes
  fullname: Stokes, Rebecca
  organization: The University of Sydney
– sequence: 9
  givenname: Michael M.
  surname: Swarbrick
  fullname: Swarbrick, Michael M.
  organization: The University of Sydney
– sequence: 10
  givenname: Frances J.
  surname: Evesson
  fullname: Evesson, Frances J.
  organization: The University of Sydney
– sequence: 11
  givenname: Sandra T.
  surname: Cooper
  fullname: Cooper, Sandra T.
  organization: The University of Sydney
– sequence: 12
  givenname: Jenny E.
  orcidid: 0000-0002-8127-9773
  surname: Gunton
  fullname: Gunton, Jenny E.
  email: jenny.gunton@sydney.edu.au
  organization: Garvan Institute of Medical Research
BackLink https://www.ncbi.nlm.nih.gov/pubmed/31225722$$D View this record in MEDLINE/PubMed
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ContentType Journal Article
Copyright 2019 The Authors. Journal of Cachexia, Sarcopenia and Muscle published by John Wiley & Sons Ltd on behalf of the Society on Sarcopenia, Cachexia and Wasting Disorders
2019 The Authors. Journal of Cachexia, Sarcopenia and Muscle published by John Wiley & Sons Ltd on behalf of the Society on Sarcopenia, Cachexia and Wasting Disorders.
2019. This work is published under http://creativecommons.org/licenses/by-nc-nd/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.
Copyright_xml – notice: 2019 The Authors. Journal of Cachexia, Sarcopenia and Muscle published by John Wiley & Sons Ltd on behalf of the Society on Sarcopenia, Cachexia and Wasting Disorders
– notice: 2019 The Authors. Journal of Cachexia, Sarcopenia and Muscle published by John Wiley & Sons Ltd on behalf of the Society on Sarcopenia, Cachexia and Wasting Disorders.
– notice: 2019. This work is published under http://creativecommons.org/licenses/by-nc-nd/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.
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Issue 6
Keywords Sarcopenia
Muscle
Vitamin D
Vitamin D receptor
Weakness
Language English
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2019 The Authors. Journal of Cachexia, Sarcopenia and Muscle published by John Wiley & Sons Ltd on behalf of the Society on Sarcopenia, Cachexia and Wasting Disorders.
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  doi: 10.1210/en.2014-1016
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Snippet Background It has long been recognized that vitamin D deficiency is associated with muscle weakness and falls. Vitamin D receptor (VDR) is present at very low...
It has long been recognized that vitamin D deficiency is associated with muscle weakness and falls. Vitamin D receptor (VDR) is present at very low levels in...
BackgroundIt has long been recognized that vitamin D deficiency is associated with muscle weakness and falls. Vitamin D receptor (VDR) is present at very low...
Abstract Background It has long been recognized that vitamin D deficiency is associated with muscle weakness and falls. Vitamin D receptor (VDR) is present at...
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StartPage 1228
SubjectTerms Actins - genetics
Animals
Body composition
Cell cycle
Cell Cycle Proteins - genetics
Down-Regulation
Gene expression
Gene Knockout Techniques
Histology
Homeostasis
Humans
Male
Mice
Muscle
Muscle function
Muscle, Skeletal - metabolism
Muscle, Skeletal - pathology
Musculoskeletal system
Organ Size
Organ Specificity
Original
Receptors, Calcitriol - deficiency
Sarcopenia
Sarcopenia - etiology
Sarcopenia - genetics
Sarcopenia - metabolism
Sarcopenia - physiopathology
Vitamin D
Vitamin D Deficiency - complications
Vitamin D receptor
Vitamin deficiency
Weakness
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Title Mice with myocyte deletion of vitamin D receptor have sarcopenia and impaired muscle function
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