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  1. Article ; Online: Reply to Comment on Hardacker, C.T.; Baccellieri, A.; Mueller, E.R.; Brubaker, L.; Hutchins, G.; Zhang, J.L.Y.; Hebert-Beirne, J. Bladder Health Experiences, Perceptions and Knowledge of Sexual and Gender Minorities. Int. J. Environ. Res. Public Health 2019, 16, 3170.

    Hardacker, Cecilia T / Baccellieri, Anna / Mueller, Elizabeth R / Brubaker, Linda / Hutchins, Georgia / Zhang, Jory Luc Yimei / Hebert-Beirne, Jeni

    International journal of environmental research and public health

    2020  Volume 17, Issue 7

    Abstract: We appreciate your comments and concerns about our manuscript in IJERPH on Bladder Health ...

    Abstract We appreciate your comments and concerns about our manuscript in IJERPH on Bladder Health Experiences, Perceptions and Knowledge of Sexual and Gender Minorities [...].
    MeSH term(s) Humans ; Public Health ; Sexual and Gender Minorities ; Urinary Bladder
    Language English
    Publishing date 2020-04-04
    Publishing country Switzerland
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Comment
    ISSN 1660-4601
    ISSN (online) 1660-4601
    DOI 10.3390/ijerph17072458
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Nystagmus Associated With the Absence of MYOD Expression Across the Lifespan in Extraocular and Limb Muscles.

    Johnson, Laura L / Hebert, Sadie / Kueppers, Rachel B / McLoon, Linda K

    Investigative ophthalmology & visual science

    2023  Volume 64, Issue 12, Page(s) 24

    Abstract: Purpose: The extraocular muscles (EOMs) undergo significant levels of continuous myonuclear turnover and myofiber remodeling throughout life, in contrast to limb skeletal muscles. Activation of the myogenic pathway in muscle precursor cells is ... ...

    Abstract Purpose: The extraocular muscles (EOMs) undergo significant levels of continuous myonuclear turnover and myofiber remodeling throughout life, in contrast to limb skeletal muscles. Activation of the myogenic pathway in muscle precursor cells is controlled by myogenic transcription factors, such as MYOD. Limb muscles from MyoD-/- mice develop normally but have a regeneration defect, and these mice develop nystagmus. We examined MyoD-/- mice to determine if they have an aging phenotype.
    Methods: Eye movements of aging MyoD-/- mice and littermate controls (wild type) were examined using optokinetic nystagmus (OKN). We assessed limb muscle function, changes to myofiber number, mean cross-sectional area, and abundance of the PAX7 and PITX2 populations of myogenic precursor cells.
    Results: Aging did not significantly affect limb muscle function despite decreased mean cross-sectional areas at 18+ months. Aging wild type mice had normal OKN responses; all aging MyoD-/- mice had nystagmus. With OKN stimulus present, the MyoD-/- mice at all ages had shorter slow phase durations compared to wild type age matched controls. In the dark, the MyoD-/- mice had a shorter slow phase duration with age. This correlated with significantly decreased fiber numbers and cross-sectional areas. The EOM in MyoD-/- mice had increased numbers of PAX7-positive satellite cells and significantly decreased PITX2-positive myonuclei.
    Conclusions: The absence of MYOD expression in aging mice causes a decrease in on-going myofiber remodeling, EOM fiber size, and number, and is associated with the development of spontaneous nystagmus. These results suggest that muscle-specific mutations can result in nystagmus, with increasing aging-related changes in the MyoD-/- EOM.
    MeSH term(s) Animals ; Mice ; Longevity ; Nystagmus, Pathologic ; Aging ; Nystagmus, Optokinetic ; Muscle, Skeletal
    Language English
    Publishing date 2023-09-19
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 391794-0
    ISSN 1552-5783 ; 0146-0404
    ISSN (online) 1552-5783
    ISSN 0146-0404
    DOI 10.1167/iovs.64.12.24
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Reply to Comment on Hardacker, C.T.; Baccellieri, A.; Mueller, E.R.; Brubaker, L.; Hutchins, G.; Zhang, J.L.Y.; Hebert-Beirne, J. Bladder Health Experiences, Perceptions and Knowledge of Sexual and Gender Minorities. Int. J. Environ. Res. Public Health 2019, 16, 3170

    Cecilia T. Hardacker / Anna Baccellieri / Elizabeth R. Mueller / Linda Brubaker / Georgia Hutchins / Jory Luc Yimei Zhang / Jeni Hebert-Beirne

    International Journal of Environmental Research and Public Health, Vol 17, Iss 2458, p

    2020  Volume 2458

    Abstract: We appreciate your comments and concerns about our manuscript in IJERPH on Bladder Health ...

    Abstract We appreciate your comments and concerns about our manuscript in IJERPH on Bladder Health Experiences, Perceptions and Knowledge of Sexual and Gender Minorities [.]
    Keywords n/a ; Medicine ; R
    Language English
    Publishing date 2020-04-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Protein and energy metabolism in type 1 diabetes.

    Hebert, Sadie L / Nair, K Sreekumaran

    Clinical nutrition (Edinburgh, Scotland)

    2009  Volume 29, Issue 1, Page(s) 13–17

    Abstract: Profound metabolic changes occur in people with type 1 diabetes mellitus during insulin deprivation. These include an increase in basal energy expenditure and reduced mitochondrial function. In addition, protein metabolism is significantly affected ... ...

    Abstract Profound metabolic changes occur in people with type 1 diabetes mellitus during insulin deprivation. These include an increase in basal energy expenditure and reduced mitochondrial function. In addition, protein metabolism is significantly affected during insulin deprivation. A greater increase in whole-body protein breakdown than protein synthesis occurs resulting in a net protein loss. During insulin deprivation the splanchnic bed has a net protein accretion which accounts for the total increase in whole-body protein synthesis while muscle is in a net catabolic state.
    MeSH term(s) Asia ; Basal Metabolism ; Diabetes Mellitus, Type 1/metabolism ; Energy Metabolism ; Humans ; Proteins/metabolism
    Chemical Substances Proteins
    Language English
    Publishing date 2009-09-27
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Review
    ZDB-ID 604812-2
    ISSN 1532-1983 ; 0261-5614
    ISSN (online) 1532-1983
    ISSN 0261-5614
    DOI 10.1016/j.clnu.2009.09.001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Sparing of the extraocular muscles in mdx mice with absent or reduced utrophin expression: A life span analysis.

    McDonald, Abby A / Hebert, Sadie L / McLoon, Linda K

    Neuromuscular disorders : NMD

    2015  Volume 25, Issue 11, Page(s) 873–887

    Abstract: Sparing of the extraocular muscles in muscular dystrophy is controversial. To address the potential role of utrophin in this sparing, mdx:utrophin(+/-) and mdx:utrophin(-/-) mice were examined for changes in myofiber size, central nucleation, and Pax7- ... ...

    Abstract Sparing of the extraocular muscles in muscular dystrophy is controversial. To address the potential role of utrophin in this sparing, mdx:utrophin(+/-) and mdx:utrophin(-/-) mice were examined for changes in myofiber size, central nucleation, and Pax7-positive and MyoD-positive cell density at intervals over their life span. Known to be spared in the mdx mouse, and contrary to previous reports, the extraocular muscles from both the mdx:utrophin(+/-) and mdx:utrophin(-/-) mice were also morphologically spared. In the mdx:utrophin(+/)(-) mice, which have a normal life span compared to the mdx:utrophin(-/-) mice, the myofibers were larger at 3 and 12 months than the wild type age-matched eye muscles. While there was a significant increase in central nucleation in the extraocular muscles from all mdx:utrophin(+/)(-) mice, the levels were still very low compared to age-matched limb skeletal muscles. Pax7- and MyoD-positive myogenic precursor cell populations were retained and were similar to age-matched wild type controls. These results support the hypothesis that utrophin is not involved in extraocular muscle sparing in these genotypes. In addition, it appears that these muscles retain the myogenic precursors that would allow them to maintain their regenerative capacity and normal morphology over a lifetime even in these more severe models of muscular dystrophy.
    MeSH term(s) Aging/metabolism ; Aging/pathology ; Animals ; Collagen/metabolism ; Fibrosis ; Image Processing, Computer-Assisted ; Immunohistochemistry ; Mice, Inbred mdx ; Muscle, Skeletal/growth & development ; Muscle, Skeletal/metabolism ; Muscle, Skeletal/pathology ; MyoD Protein/metabolism ; Oculomotor Muscles/growth & development ; Oculomotor Muscles/metabolism ; Oculomotor Muscles/pathology ; Organ Size ; PAX7 Transcription Factor/metabolism ; Utrophin/genetics ; Utrophin/metabolism
    Chemical Substances MyoD Protein ; MyoD1 myogenic differentiation protein ; PAX7 Transcription Factor ; Pax7 protein, mouse ; Utrophin ; Collagen (9007-34-5)
    Language English
    Publishing date 2015-09-06
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 1077681-3
    ISSN 1873-2364 ; 0960-8966
    ISSN (online) 1873-2364
    ISSN 0960-8966
    DOI 10.1016/j.nmd.2015.09.001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Understanding the Experiences of COVID-19 Public Health Measures and Well-Being: A Qualitative Study Among Older Adults in Quebec, Canada.

    Karmann, Julie / Handlovsky, Ingrid / Moullec, Gregory / Frohlich, Katherine L / Hébert, Réjean / Ferlatte, Olivier

    Qualitative health research

    2024  , Page(s) 10497323241232928

    Abstract: ... thematic analysis. The impacts of health measures on the well-being of participants were framed according ...

    Abstract This interpretative descriptive study explores how public health measures implemented during the first wave of the COVID-19 pandemic in Quebec, Canada, affected the well-being of older adults. Twenty-six participants aged 60-81 took photographs to depict how COVID-19 public health measures affected their well-being and were invited to discuss their photographs in virtual focus groups. Data were analyzed using thematic analysis. The impacts of health measures on the well-being of participants were framed according to three overarching themes. First, participants endured an intensification of ageism, feeling diminished and excluded from their social spheres. Second, they faced a burden of loneliness due to the loss of connections with their communities, particularly for those who were single and without children. Third, participants highlighted navigating a degradation of social cohesion. This manifested through tensions and distrust in both the public and private spheres, as well as acts of resistance in response to rules deemed unjust. While public health measures were essential to prevent onward transmission of COVID-19 and mortality, they negatively impacted older adults' self-image, loneliness, and trust in society. This study argues for a rethinking of public health norms specific to older adults to address potential sources of inequality. In particular, a greater emphasis is needed on social connectedness and addressing the unique needs of older adults during pandemics.
    Language English
    Publishing date 2024-03-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1275716-0
    ISSN 1552-7557 ; 1049-7323
    ISSN (online) 1552-7557
    ISSN 1049-7323
    DOI 10.1177/10497323241232928
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: The role of Pitx2 in maintaining the phenotype of myogenic precursor cells in the extraocular muscles.

    Sadie L Hebert / Mark L Daniel / Linda K McLoon

    PLoS ONE, Vol 8, Iss 3, p e

    2013  Volume 58405

    Abstract: Many differences exist between extraocular muscles (EOM) and non-cranial skeletal muscles. One striking difference is the sparing of EOM in various muscular dystrophies compared to non-cranial skeletal muscles. EOM undergo continuous myonuclear ... ...

    Abstract Many differences exist between extraocular muscles (EOM) and non-cranial skeletal muscles. One striking difference is the sparing of EOM in various muscular dystrophies compared to non-cranial skeletal muscles. EOM undergo continuous myonuclear remodeling in normal, uninjured adults, and distinct transcription factors are required for the early determination, development, and maintenance of EOM compared to limb skeletal muscle. Pitx2, a bicoid-like homeobox transcription factor, is required for the development of EOM and the maintenance of characteristic properties of the adult EOM phenotype, but is not required for the development of limb muscle. We hypothesize that these unique properties of EOM contribute to the constitutive differences between EOM and non-craniofacial skeletal muscles. Using flow cytometry, CD34(+)/Sca1(-/)CD45(-/)CD31(-) cells (EECD34 cells) were isolated from extraocular and limb skeletal muscle and in vitro, EOM EECD34 cells proliferated faster than limb muscle EECD34 cells. To further define these myogenic precursor cells from EOM and limb skeletal muscle, they were analyzed for their expression of Pitx2. Western blotting and immunohistochemical data demonstrated that EOM express higher levels of Pitx2 than limb muscle, and 80% of the EECD34 cells expressed Pitx2. siRNA knockdown of Pitx2 expression in EECD34 cells in vitro decreased proliferation rates and impaired the ability of EECD34 cells to fuse into multinucleated myotubes. High levels of Pitx2 were retained in dystrophic and aging mouse EOM and the EOM EECD34 cells compared to limb muscle. The differential expression of Pitx2 between EOM and limb skeletal muscle along with the functional changes in response to lower levels of Pitx2 expression in the myogenic precursor cells suggest a role for Pitx2 in the maintenance of constitutive differences between EOM and limb skeletal muscle that may contribute to the sparing of EOM in muscular dystrophies.
    Keywords Medicine ; R ; Science ; Q
    Subject code 610
    Language English
    Publishing date 2013-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: The role of Pitx2 in maintaining the phenotype of myogenic precursor cells in the extraocular muscles.

    Hebert, Sadie L / Daniel, Mark L / McLoon, Linda K

    PloS one

    2013  Volume 8, Issue 3, Page(s) e58405

    Abstract: Many differences exist between extraocular muscles (EOM) and non-cranial skeletal muscles. One striking difference is the sparing of EOM in various muscular dystrophies compared to non-cranial skeletal muscles. EOM undergo continuous myonuclear ... ...

    Abstract Many differences exist between extraocular muscles (EOM) and non-cranial skeletal muscles. One striking difference is the sparing of EOM in various muscular dystrophies compared to non-cranial skeletal muscles. EOM undergo continuous myonuclear remodeling in normal, uninjured adults, and distinct transcription factors are required for the early determination, development, and maintenance of EOM compared to limb skeletal muscle. Pitx2, a bicoid-like homeobox transcription factor, is required for the development of EOM and the maintenance of characteristic properties of the adult EOM phenotype, but is not required for the development of limb muscle. We hypothesize that these unique properties of EOM contribute to the constitutive differences between EOM and non-craniofacial skeletal muscles. Using flow cytometry, CD34(+)/Sca1(-/)CD45(-/)CD31(-) cells (EECD34 cells) were isolated from extraocular and limb skeletal muscle and in vitro, EOM EECD34 cells proliferated faster than limb muscle EECD34 cells. To further define these myogenic precursor cells from EOM and limb skeletal muscle, they were analyzed for their expression of Pitx2. Western blotting and immunohistochemical data demonstrated that EOM express higher levels of Pitx2 than limb muscle, and 80% of the EECD34 cells expressed Pitx2. siRNA knockdown of Pitx2 expression in EECD34 cells in vitro decreased proliferation rates and impaired the ability of EECD34 cells to fuse into multinucleated myotubes. High levels of Pitx2 were retained in dystrophic and aging mouse EOM and the EOM EECD34 cells compared to limb muscle. The differential expression of Pitx2 between EOM and limb skeletal muscle along with the functional changes in response to lower levels of Pitx2 expression in the myogenic precursor cells suggest a role for Pitx2 in the maintenance of constitutive differences between EOM and limb skeletal muscle that may contribute to the sparing of EOM in muscular dystrophies.
    MeSH term(s) Adult ; Animals ; Antigens, CD34/metabolism ; Cell Differentiation/genetics ; Cell Proliferation ; Cells, Cultured ; Female ; Gene Expression ; Homeodomain Proteins/genetics ; Homeodomain Proteins/metabolism ; Humans ; Male ; Mice ; Mice, Knockout ; Middle Aged ; Muscle, Skeletal/metabolism ; Muscular Dystrophies/genetics ; Muscular Dystrophies/metabolism ; MyoD Protein/genetics ; MyoD Protein/metabolism ; Myoblasts/cytology ; Myoblasts/metabolism ; PAX7 Transcription Factor/genetics ; PAX7 Transcription Factor/metabolism ; Phenotype ; Protein Transport ; Transcription Factors/genetics ; Transcription Factors/metabolism ; Homeobox Protein PITX2
    Chemical Substances Antigens, CD34 ; Homeodomain Proteins ; MyoD Protein ; PAX7 Transcription Factor ; Transcription Factors
    Language English
    Publishing date 2013-03-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0058405
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Mitochondrial DNA alterations and reduced mitochondrial function in aging.

    Hebert, Sadie L / Lanza, Ian R / Nair, K Sreekumaran

    Mechanisms of ageing and development

    2010  Volume 131, Issue 7-8, Page(s) 451–462

    Abstract: Oxidative damage to mitochondrial DNA increases with aging. This damage has the potential to affect mitochondrial DNA replication and transcription which could alter the abundance or functionality of mitochondrial proteins. This review describes ... ...

    Abstract Oxidative damage to mitochondrial DNA increases with aging. This damage has the potential to affect mitochondrial DNA replication and transcription which could alter the abundance or functionality of mitochondrial proteins. This review describes mitochondrial DNA alterations and changes in mitochondrial function that occur with aging. Age-related alterations in mitochondrial DNA as a possible contributor to the reduction in mitochondrial function are discussed.
    MeSH term(s) Age Factors ; Aging/genetics ; Aging/metabolism ; Animals ; DNA Damage ; DNA, Mitochondrial/metabolism ; Energy Metabolism/genetics ; Gene Expression Regulation ; Humans ; Mice ; Mitochondria/metabolism ; Mutation ; Oxidative Stress ; Reactive Oxygen Species/metabolism
    Chemical Substances DNA, Mitochondrial ; Reactive Oxygen Species
    Language English
    Publishing date 2010-03-20
    Publishing country Ireland
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 183915-9
    ISSN 1872-6216 ; 0047-6374
    ISSN (online) 1872-6216
    ISSN 0047-6374
    DOI 10.1016/j.mad.2010.03.007
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Effects of retinoic acid signaling on extraocular muscle myogenic precursor cells in vitro.

    Hebert, Sadie L / Fitzpatrick, Krysta R / McConnell, Samantha A / Cucak, Anja / Yuan, Ching / McLoon, Linda K

    Experimental cell research

    2017  Volume 361, Issue 1, Page(s) 101–111

    Abstract: One major difference between limb and extraocular muscles (EOM) is the presence of an enriched population of Pitx2-positive myogenic precursor cells in EOM compared to limb muscle. We hypothesize that retinoic acid regulates Pitx2 expression in EOM ... ...

    Abstract One major difference between limb and extraocular muscles (EOM) is the presence of an enriched population of Pitx2-positive myogenic precursor cells in EOM compared to limb muscle. We hypothesize that retinoic acid regulates Pitx2 expression in EOM myogenic precursor cells and that its effects would differ in leg muscle. The two muscle groups expressed differential retinoic acid receptor (RAR) and retinoid X receptor (RXR) levels. RXR co-localized with the Pitx2-positive cells but not with those expressing Pax7. EOM-derived and LEG-derived EECD34 cells were treated with vehicle, retinoic acid, the RXR agonist bexarotene, the RAR inverse agonist BMS493, or the RXR antagonist UVI 3003. In vitro, fewer EOM-derived EECD34 cells expressed desmin and fused, while more LEG-derived cells expressed desmin and fused when treated with retinoic acid compared to vehicle. Both EOM and LEG-derived EECD34 cells exposed to retinoic acid showed a higher percentage of cells expressing Pitx2 compared to vehicle, supporting the hypothesis that retinoic acid plays a role in maintaining Pitx2 expression. We hypothesize that retinoic acid signaling aids in the maintenance of large numbers of undifferentiated myogenic precursor cells in the EOM, which would be required to maintain EOM normalcy throughout a lifetime of myonuclear turnover.
    MeSH term(s) Animals ; Apoptosis/drug effects ; Cell Proliferation/drug effects ; Cells, Cultured ; Homeodomain Proteins/metabolism ; In Vitro Techniques ; Keratolytic Agents/pharmacology ; Mice ; Mice, Inbred C57BL ; Muscle Development/drug effects ; Muscle Development/physiology ; Muscle, Skeletal/cytology ; Muscle, Skeletal/drug effects ; Muscle, Skeletal/metabolism ; Myoblasts/cytology ; Myoblasts/drug effects ; Myoblasts/metabolism ; Oculomotor Muscles/cytology ; Oculomotor Muscles/drug effects ; Oculomotor Muscles/metabolism ; PAX7 Transcription Factor/metabolism ; Retinoid X Receptors/metabolism ; Transcription Factors/metabolism ; Tretinoin/pharmacology ; Homeobox Protein PITX2
    Chemical Substances Homeodomain Proteins ; Keratolytic Agents ; PAX7 Transcription Factor ; Pax7 protein, mouse ; Retinoid X Receptors ; Transcription Factors ; Tretinoin (5688UTC01R)
    Language English
    Publishing date 2017-10-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1493-x
    ISSN 1090-2422 ; 0014-4827
    ISSN (online) 1090-2422
    ISSN 0014-4827
    DOI 10.1016/j.yexcr.2017.10.007
    Database MEDical Literature Analysis and Retrieval System OnLINE

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