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  1. Article: Deletion of absent in melanoma (AIM) 2 gene alters bone morphology.

    Gong, Zhenwei / Dixit, Manisha / Poudel, Sher Bahadur / Yildirim, Gozde / Yakar, Shoshanna / Muzumdar, Radhika

    bioRxiv : the preprint server for biology

    2024  

    Abstract: Absent in Melanoma (AIM) 2 is a gene that is induced by interferon and acts as a cytosolic sensor for double-stranded (ds) DNA. It forms the AIM2 inflammasome, leading to the production of interleukin (IL)-1β and IL-18. Our previous research demonstrated ...

    Abstract Absent in Melanoma (AIM) 2 is a gene that is induced by interferon and acts as a cytosolic sensor for double-stranded (ds) DNA. It forms the AIM2 inflammasome, leading to the production of interleukin (IL)-1β and IL-18. Our previous research demonstrated that mice lacking AIM2 exhibit spontaneous obesity, insulin resistance, and inflammation in adipose tissue. In this study, we aimed to explore the impact of AIM2 gene deletion on bone structure in adult and aged mice. Utilizing micro-computed tomography (micro-CT), we discovered that female mice lacking AIM2 showed an increase in the total cross-sectional area at 5 months of age, accompanied by an increase in cortical thickness in the mid-diaphysis of the femur at both 5 and 15 months of age. At 15 months of age, the cortical bone mineral density (BMD) significantly decreased in AIM2 null females compared to wild-type (WT) mice. In AIM2 null mice, both trabecular bone volume and BMD at the distal metaphysis of the femur significantly decreased at 5 and 15 months of age. Similarly, micro-CT analysis of the L4 vertebra revealed significant decreases in trabecular bone volume and BMD in aged AIM2 null females compared to WT mice. Histological examination of femurs from aged mice demonstrated increased bone marrow adiposity in AIM2 null mice, accompanied by a significant increase in CD45-/CD31-/Sca1+/Pdgfa+ adipose progenitor cells, and a decrease in the ratio of CD31-/CD31+ osteogenic progenitor cells, as determined by flow cytometry of bone marrow cells. Our findings suggest that AIM2 deficiency affects bone health by promoting adipogenesis in bone marrow cells and inducing a pro-inflammatory environment, potentially contributing to the decreased bone mineral density.
    Language English
    Publishing date 2024-01-06
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2024.01.05.574199
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Biopotentials of Collagen Scaffold Impregnated with Plant-Cell-Derived Epidermal Growth Factor in Defective Bone Healing.

    Poudel, Sher Bahadur / Bhattarai, Govinda / Kwon, Tae-Ho / Lee, Jeong-Chae

    Materials (Basel, Switzerland)

    2023  Volume 16, Issue 9

    Abstract: The combination of scaffolds with recombinant human epidermal growth factor (rhEGF) protein can enhance defective bone healing via synergistic activation to stimulate cellular growth, differentiation, and survival. We examined the biopotentials of an ... ...

    Abstract The combination of scaffolds with recombinant human epidermal growth factor (rhEGF) protein can enhance defective bone healing via synergistic activation to stimulate cellular growth, differentiation, and survival. We examined the biopotentials of an rhEGF-loaded absorbable collagen scaffold (ACS) using a mouse model of calvarial defects, in which the rhEGF was produced from a plant cell suspension culture system because of several systemic advantages. Here, we showed a successful and large-scale production of plant-cell-derived rhEGF protein (p-rhEGF) by introducing an expression vector that cloned with its cDNA under the control of rice α-amylase 3D promoter into rice calli (
    Language English
    Publishing date 2023-04-24
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma16093335
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Effects of GH/IGF axis on bone and cartilage

    Dixit, Manisha / Poudel, Sher Bahadur / Yakar, Shoshana

    Molecular and cellular endocrinology. 2021 Jan. 01, v. 519

    2021  

    Abstract: Growth hormone (GH) and its mediator, the insulin-like growth factor-1 (IGF-1) regulate somatic growth, metabolism and many aspects of aging. As such, actions of GH/IGF have been studied in many tissues and organs over decades. GH and IGF-1 are part of ... ...

    Abstract Growth hormone (GH) and its mediator, the insulin-like growth factor-1 (IGF-1) regulate somatic growth, metabolism and many aspects of aging. As such, actions of GH/IGF have been studied in many tissues and organs over decades. GH and IGF-1 are part of the hypothalamic/pituitary somatotrophic axis that consists of many other regulatory hormones, receptors, binding proteins, and proteases. In humans, GH/IGF actions peak during pubertal growth and regulate skeletal acquisition through stimulation of extracellular matrix production and increases in bone mineral density. During aging the activity of these hormones declines, a state called somatopaguss, which associates with deleterious effects on the musculoskeletal system. In this review, we will focus on GH/IGF-1 action in bone and cartilage. We will cover many studies that have utilized congenital ablation or overexpression of members of this axis, as well as cell-specific gene-targeting approaches used to unravel the nature of the GH/IGF-1 actions in the skeleton in vivo.
    Keywords bone density ; cartilage ; extracellular matrix ; gene targeting ; insulin-like growth factor I ; metabolism ; proteinases ; skeleton ; somatotropin
    Language English
    Dates of publication 2021-0101
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 187438-x
    ISSN 1872-8057 ; 0303-7207
    ISSN (online) 1872-8057
    ISSN 0303-7207
    DOI 10.1016/j.mce.2020.111052
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Development of primary osteoarthritis during aging in genetically diverse UM-HET3 mice.

    Poudel, Sher Bahadur / Ruff, Ryan R / Yildirim, Gozde / Miller, Richard A / Harrison, David E / Strong, Randy / Kirsch, Thorsten / Yakar, Shoshana

    bioRxiv : the preprint server for biology

    2024  

    Abstract: This study investigated the prevalence and progression of primary osteoarthritis (OA) in aged UM-HET3 mice. Using the Osteoarthritis Research Society International (OARSI) scoring system, we assessed articular cartilage (AC) integrity in 182 knee joints ... ...

    Abstract This study investigated the prevalence and progression of primary osteoarthritis (OA) in aged UM-HET3 mice. Using the Osteoarthritis Research Society International (OARSI) scoring system, we assessed articular cartilage (AC) integrity in 182 knee joints of 22-25 months old mice. Aged UM-HET3 mice showed a high prevalence of primary OA in both sexes. Significant positive correlations were found between cumulative AC (cAC) scores and synovitis in both sexes, and osteophyte formation in female mice. Ectopic chondrogenesis did not show significant correlations with cAC scores. Significant direct correlations were found between AC scores and inflammatory markers in chondrocytes, including matrix metalloproteinase-13 (MMP-13), inducible nitric oxide synthase (iNOS), and the NLR family pyrin domain containing-3 (NLRP3) inflammasome in both sexes, indicating a link between OA severity and inflammation. Additionally, markers of cell cycle arrest, such as p16 and β-galactosidase, also correlated with AC scores. Using micro-CT, we examined the correlations between subchondral bone (SCB) morphology traits and AC scores. In male mice, no significant correlations were found between SCB morphology traits and cAC scores, while in female mice, significant correlations were found between cAC scores and tibial SCB plate bone mineral density. Finally, we explored the effects of methylene blue (MB) and mitoquinone (MitoQ), two agents that affect mitochondrial function, on the prevalence and progression of OA during aging. Notably, MB and MitoQ treatments influenced the disease's progression in a sex-specific manner. MB treatment significantly reduced cAC scores at the medial knee joint, while MitoQ treatment reduced cAC scores, but these did not reach significance. In conclusion, our study provides comprehensive insights into the prevalence and progression of primary OA in aged UM-HET3 mice, highlighting the sex-specific effects of MB and MitoQ treatments. The correlations between AC scores and various pathological factors underscore the multifaceted nature of OA and its association with inflammation and subchondral bone changes.
    Language English
    Publishing date 2024-01-14
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2023.12.16.571693
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Development of primary osteoarthritis during aging in genetically diverse UM-HET3 mice.

    Poudel, Sher Bahadur / Ruff, Ryan R / Yildirim, Gozde / Miller, Richard A / Harrison, David E / Strong, Randy / Kirsch, Thorsten / Yakar, Shoshana

    Research square

    2024  

    Abstract: Background: Primary osteoarthritis (OA) occurs without identifiable underlying causes such as previous injuries or specific medical conditions. Age is a major contributing factor to OA, and as one ages, various joint tissues undergo gradual change, ... ...

    Abstract Background: Primary osteoarthritis (OA) occurs without identifiable underlying causes such as previous injuries or specific medical conditions. Age is a major contributing factor to OA, and as one ages, various joint tissues undergo gradual change, including degeneration of the articular cartilage, alterations in subchondral bone (SCB) morphology, and inflammation of the synovium.
    Methods: We investigated the prevalence of primary OA in aged, genetically diverse UM-HET3 mice. Articular cartilage (AC) integrity and SCB morphology were assessed in 182 knee joints of 22-25 months old mice using the Osteoarthritis Research Society International (OARSI) scoring system and micro-CT, respectively. Additionally, we explored the effects of methylene blue (MB) and mitoquinone (MitoQ), two agents that affect mitochondrial function, on the prevalence and progression of OA during aging.
    Results: Aged UM-HET3 mice showed a high prevalence of primary OA in both sexes. Significant positive correlations were found between cumulative AC (cAC) scores and synovitis in both sexes, and osteophyte formation in female mice. Ectopic chondrogenesis did not show significant correlations with cAC scores. Significant direct correlations were found between AC scores and inflammatory markers in chondrocytes, including matrix metalloproteinase-13, inducible nitric oxide synthase, and the NLR family pyrin domain containing-3 inflammasome in both sexes, indicating a link between OA severity and inflammation. Additionally, markers of cell cycle arrest, such as p16 and β-galactosidase, also correlated with AC scores. In male mice, no significant correlations were found between SCB morphology traits and cAC scores, while in female mice, significant correlations were found between cAC scores and tibial SCB plate bone mineral density. Notably, MB and MitoQ treatments influenced the disease's progression in a sex-specific manner. MB treatment significantly reduced cAC scores at the medial knee joint, while MitoQ treatment reduced cAC scores, but these did not reach significance.
    Conclusions: Our study provides comprehensive insights into the prevalence and progression of primary OA in aged UM-HET3 mice, highlighting the sex-specific effects of MB and MitoQ treatments. The correlations between AC scores and various pathological factors underscore the multifaceted nature of OA and its association with inflammation and subchondral bone changes.
    Language English
    Publishing date 2024-01-22
    Publishing country United States
    Document type Preprint
    DOI 10.21203/rs.3.rs-3858256/v1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Effects of GH/IGF axis on bone and cartilage.

    Dixit, Manisha / Poudel, Sher Bahadur / Yakar, Shoshana

    Molecular and cellular endocrinology

    2020  Volume 519, Page(s) 111052

    Abstract: Growth hormone (GH) and its mediator, the insulin-like growth factor-1 (IGF-1) regulate somatic growth, metabolism and many aspects of aging. As such, actions of GH/IGF have been studied in many tissues and organs over decades. GH and IGF-1 are part of ... ...

    Abstract Growth hormone (GH) and its mediator, the insulin-like growth factor-1 (IGF-1) regulate somatic growth, metabolism and many aspects of aging. As such, actions of GH/IGF have been studied in many tissues and organs over decades. GH and IGF-1 are part of the hypothalamic/pituitary somatotrophic axis that consists of many other regulatory hormones, receptors, binding proteins, and proteases. In humans, GH/IGF actions peak during pubertal growth and regulate skeletal acquisition through stimulation of extracellular matrix production and increases in bone mineral density. During aging the activity of these hormones declines, a state called somatopaguss, which associates with deleterious effects on the musculoskeletal system. In this review, we will focus on GH/IGF-1 action in bone and cartilage. We will cover many studies that have utilized congenital ablation or overexpression of members of this axis, as well as cell-specific gene-targeting approaches used to unravel the nature of the GH/IGF-1 actions in the skeleton in vivo.
    MeSH term(s) Animals ; Bone Development ; Bone and Bones/metabolism ; Cartilage/metabolism ; Growth Hormone/metabolism ; Humans ; Insulin-Like Growth Factor I/metabolism ; Osteoarthritis/metabolism ; Osteoarthritis/pathology
    Chemical Substances Insulin-Like Growth Factor I (67763-96-6) ; Growth Hormone (9002-72-6)
    Language English
    Publishing date 2020-10-14
    Publishing country Ireland
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Review
    ZDB-ID 187438-x
    ISSN 1872-8057 ; 0303-7207
    ISSN (online) 1872-8057
    ISSN 0303-7207
    DOI 10.1016/j.mce.2020.111052
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Osteoblastic Wls Ablation Protects Mice from Total Body Irradiation-Induced Impairments in Hematopoiesis and Bone Marrow Microenvironment.

    Sim, Hyun-Jaung / So, Han-Sol / Poudel, Sher Bahadur / Bhattarai, Govinda / Cho, Eui-Sic / Lee, Jeong-Chae / Kook, Sung-Ho

    Aging and disease

    2023  Volume 14, Issue 3, Page(s) 919–936

    Abstract: Ionizing irradiation (IR) causes bone marrow (BM) injury, with senescence and impaired self-renewal of hematopoietic stem cells (HSCs), and inhibiting Wnt signaling could enhance hematopoietic regeneration and survival against IR stress. However, the ... ...

    Abstract Ionizing irradiation (IR) causes bone marrow (BM) injury, with senescence and impaired self-renewal of hematopoietic stem cells (HSCs), and inhibiting Wnt signaling could enhance hematopoietic regeneration and survival against IR stress. However, the underlying mechanisms by which a Wnt signaling blockade modulates IR-mediated damage of BM HSCs and mesenchymal stem cells (MSCs) are not yet completely understood. We investigated the effects of osteoblastic Wntless (Wls) depletion on total body irradiation (TBI, 5 Gy)-induced impairments in hematopoietic development, MSC function, and the BM microenvironment using conditional Wls knockout mutant mice (Col-Cre;Wls
    Language English
    Publishing date 2023-06-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2625789-0
    ISSN 2152-5250
    ISSN 2152-5250
    DOI 10.14336/AD.2022.1026
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Targeting mitochondrial dysfunction using methylene blue or mitoquinone to improve skeletal aging.

    Poudel, Sher Bahadur / Frikha-Benayed, Dorra / Ruff, Ryan R / Yildirim, Gozde / Dixit, Manisha / Korstanje, Ron / Robinson, Laura / Miller, Richard A / Harrison, David E / Strong, John R / Schaffler, Mitchell B / Yakar, Shoshana

    Aging

    2024  Volume 16, Issue 6, Page(s) 4948–4964

    Abstract: Methylene blue (MB) is a well-established antioxidant that has been shown to improve mitochondrial function in ... ...

    Abstract Methylene blue (MB) is a well-established antioxidant that has been shown to improve mitochondrial function in both
    MeSH term(s) Male ; Female ; Mice ; Animals ; Antioxidants/pharmacology ; Methylene Blue/pharmacology ; Mice, Inbred C57BL ; Oxidative Stress ; Aging ; Mitochondrial Diseases ; Organophosphorus Compounds ; Ubiquinone/analogs & derivatives
    Chemical Substances mitoquinone (47BYS17IY0) ; Antioxidants ; Methylene Blue (T42P99266K) ; Organophosphorus Compounds ; Ubiquinone (1339-63-5)
    Language English
    Publishing date 2024-03-25
    Publishing country United States
    Document type Journal Article
    ISSN 1945-4589
    ISSN (online) 1945-4589
    DOI 10.18632/aging.205147
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Local and Systemic Overexpression of COMP-Ang1 Induces Ang1/Tie2-Related Thrombocytopenia and SDF-1/CXCR4-Dependent Anemia.

    Sim, Hyun-Jaung / Bhattarai, Govinda / Kim, Min-Hye / So, Han-Sol / Poudel, Sher Bahadur / Cho, Eui-Sic / Kook, Sung-Ho / Lee, Jeong-Chae

    Stem cells (Dayton, Ohio)

    2022  Volume 41, Issue 1, Page(s) 93–104

    Abstract: While supplemental angiopoietin-1 (Ang1) improves hematopoiesis, excessive Ang1 induces bone marrow (BM) impairment, hematopoietic stem cell (HSC) senescence, and erythropoietic defect. Here, we examined how excessive Ang1 disturbs hematopoiesis and ... ...

    Abstract While supplemental angiopoietin-1 (Ang1) improves hematopoiesis, excessive Ang1 induces bone marrow (BM) impairment, hematopoietic stem cell (HSC) senescence, and erythropoietic defect. Here, we examined how excessive Ang1 disturbs hematopoiesis and explored whether hematopoietic defects were related to its level using K14-Cre;c-Ang1 and Col2.3-Cre;c-Ang1 transgenic mice that systemically and locally overexpress cartilage oligomeric matrix protein-Ang1, respectively. We also investigated the impacts of Tie2 inhibitor and AMD3100 on hematopoietic development. Transgenic mice exhibited excessive angiogenic phenotypes, but K14-Cre;c-Ang1 mice showed more severe defects in growth and life span with higher presence of Ang1 compared with Col2.3-Cre;c-Ang1 mice. Dissimilar to K14-Cre;c-Ang1 mice, Col2.3-Cre;c-Ang1 mice did not show impaired BM retention or senescence of HSCs, erythropoietic defect, or disruption of the stromal cell-derived factor 1 (SDF-1)/CXCR4 axis. However, these mice exhibited a defect in platelet production depending on the expression of Tie2 and globin transcription factor 1 (GATA-1), but not GATA-2, in megakaryocyte progenitor (MP) cells. Treatment with Tie2 inhibitor recovered GATA-1 expression in MP cells and platelet production without changes in circulating RBC in transgenic mice. Consecutive AMD3100 administration not only induced irrecoverable senescence of HSCs but also suppressed formation of RBC, but not platelets, via correlated decreases in number of erythroblasts and their GATA-1 expression in B6 mice. Our results indicate that genetic overexpression of Ang1 impairs hematopoietic development depending on its level, in which megakaryopoiesis is preferentially impaired via activation of Ang1/Tie2 signaling, whereas erythropoietic defect is orchestrated by HSC senescence, inflammation, and disruption of the SDF-1/CXCR4 axis.
    MeSH term(s) Mice ; Animals ; Cartilage Oligomeric Matrix Protein/genetics ; Angiopoietin-1/genetics ; Angiopoietin-1/metabolism ; Chemokine CXCL12/genetics ; Chemokine CXCL12/metabolism ; Mice, Transgenic ; Anemia/genetics ; Thrombocytopenia ; Receptor, TIE-2/genetics ; Receptor, TIE-2/metabolism
    Chemical Substances plerixafor (S915P5499N) ; Cartilage Oligomeric Matrix Protein ; Angiopoietin-1 ; Chemokine CXCL12 ; Receptor, TIE-2 (EC 2.7.10.1)
    Language English
    Publishing date 2022-11-11
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1143556-2
    ISSN 1549-4918 ; 1066-5099
    ISSN (online) 1549-4918
    ISSN 1066-5099
    DOI 10.1093/stmcls/sxac080
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Anti-inflammatory, anti-osteoclastic, and antioxidant activities of genistein protect against alveolar bone loss and periodontal tissue degradation in a mouse model of periodontitis.

    Bhattarai, Govinda / Poudel, Sher Bahadur / Kook, Sung-Ho / Lee, Jeong-Chae

    Journal of biomedical materials research. Part A

    2017  Volume 105, Issue 9, Page(s) 2510–2521

    Abstract: Genistein, a dietary polyphenol primarily found in soy products, has beneficial effects on bone. However, the effect of genistein on inflammatory periodontal destruction has not been investigated in detail. We explored whether genistein protects against ... ...

    Abstract Genistein, a dietary polyphenol primarily found in soy products, has beneficial effects on bone. However, the effect of genistein on inflammatory periodontal destruction has not been investigated in detail. We explored whether genistein protects against lipopolysaccharide (LPS)/ligature-induced periodontitis in mice. We also examined the effect of genistein on LPS-stimulated inflammatory and oxidative stress using RAW 264.7 macrophages and human gingival fibroblasts (hGFs). The results from μCT and histological analyses revealed that intraperitoneal injection of genistein (20 mg/kg body weight) daily for three weeks inhibited LPS-mediated alveolar bone loss and periodontal tissue degradation. The administration of genistein also inhibited osteoclast formation and the expression of inflammation-related molecules in the inflamed region of mice with periodontitis. Treatment with 30-70 μM genistein significantly prevented osteoclast differentiation in receptor activator of nuclear factor κB ligand- or LPS-stimulated macrophages by suppressing the expression of osteoclast-specific molecules. The addition of genistein led to a dose-dependent inhibition of the expression of inflammation-related molecules both in LPS-stimulated macrophages and hGFs. In addition, genistein at 50 μM protected hGFs from LPS-mediated stresses such as mitochondrial impairment and cellular ROS accumulation. However, such protection was significantly diminished by combined treatment with 25 nM bafilomycin A1, a chemical autophagy inhibitor. Collectively, our results indicate that genistein protects against inflammatory periodontal damage by regulating autophagy induction and inhibiting osteoclast activation, the production of inflammation mediators, and mitochondrial oxidative damage. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 2510-2521, 2017.
    Language English
    Publishing date 2017-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2099989-6
    ISSN 1552-4965 ; 1549-3296 ; 0021-9304
    ISSN (online) 1552-4965
    ISSN 1549-3296 ; 0021-9304
    DOI 10.1002/jbm.a.36109
    Database MEDical Literature Analysis and Retrieval System OnLINE

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