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Blank K, Ekanayake D, Cooke M, Bragdon B, Hussein A, Gerstenfeld L. Relationships between matrix mineralization, oxidative metabolism, and mitochondrial structure during ATDC5 murine chondroprogenitor cell line differentiation. J Cell Physiol 2024. [PMID: 38860464 DOI: 10.1002/jcp.31285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 03/19/2024] [Accepted: 04/12/2024] [Indexed: 06/12/2024]
Abstract
The mechanistic relationships between the progression of growth chondrocyte differentiation, matrix mineralization, oxidative metabolism, and mitochondria content and structure were examined in the ATDC5 murine chondroprogenitor cell line. The progression of chondrocyte differentiation was associated with a statistically significant (p ≤ 0.05) ~2-fold increase in oxidative phosphorylation. However, as matrix mineralization progressed, oxidative metabolism decreased. In the absence of mineralization, cartilage extracellular matrix mRNA expression for Col2a1, Aggrecan, and Col10a1 were statistically (p ≤ 0.05) ~2-3-fold greater than observed in mineralizing cultures. In contrast, BSP and Phex that are associated with promoting matrix mineralization showed statistically (p ≤ 0.05) higher ~2-4 expression, while FGF23 phosphate regulatory factor was significantly lower (~50%) in mineralizing cultures. Cultures induced to differentiate under both nonmineralizing and mineralizing media conditions showed statistically greater basal oxidative metabolism and ATP production. Maximal respiration and spare oxidative capacity were significantly elevated (p ≤ 0.05) in differentiated nonmineralizing cultures compared to those that mineralized. Increased oxidative metabolism was associated with both an increase in mitochondria volume per cell and mitochondria fusion, while mineralization diminished mitochondrial volume and appeared to be associated with fission. Undifferentiated and mineralized cells showed increased mitochondrial co-localization with the actin cytoskeletal. Examination of proteins associated with mitochondria fission and apoptosis and mitophagy, respectively, showed levels of immunological expression consistent with the increasing fission and apoptosis in mineralizing cultures. These results suggest that chondrocyte differentiation is associated with intracellular structural reorganization, promoting increased mitochondria content and fusion that enables increased oxidative metabolism. Mineralization, however, does not need energy derived from oxidative metabolism; rather, during mineralization, mitochondria appear to undergo fission and mitophagy. In summary, these studies show that as chondrocytes underwent hypertrophic differentiation, they increased oxidative metabolism, but as mineralization proceeds, metabolism decreased. Mitochondria structure also underwent a structural reorganization that was further supportive of their oxidative capacity as the chondrocytes progressed through their differentiation. Thus, the mitochondria first underwent fusion to support increased oxidative metabolism, then underwent fission during mineralization, facilitating their programed death.
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Affiliation(s)
- Kevin Blank
- Department of Orthopaedic Surgery, Boston School of Medicine, Boston, Massachusetts, USA
| | - Derrick Ekanayake
- Department of Orthopaedic Surgery, Boston School of Medicine, Boston, Massachusetts, USA
| | - Margaret Cooke
- Department of Orthopaedic Surgery, Boston School of Medicine, Boston, Massachusetts, USA
- Department of Orthopaedic Surgery, Stanford University School of Medicine, Redwood City, California
| | - Beth Bragdon
- Department of Orthopaedic Surgery, Boston School of Medicine, Boston, Massachusetts, USA
| | - Amira Hussein
- Department of Orthopaedic Surgery, Boston School of Medicine, Boston, Massachusetts, USA
| | - Louis Gerstenfeld
- Department of Orthopaedic Surgery, Boston School of Medicine, Boston, Massachusetts, USA
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Yuan J, Guo L, Wang J, Zhou Z, Wu C. α-parvin controls chondrocyte column formation and regulates long bone development. Bone Res 2023; 11:46. [PMID: 37607905 PMCID: PMC10444880 DOI: 10.1038/s41413-023-00284-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 07/09/2023] [Accepted: 07/19/2023] [Indexed: 08/24/2023] Open
Abstract
Endochondral ossification requires proper control of chondrocyte proliferation, differentiation, survival, and organization. Here we show that knockout of α-parvin, an integrin-associated focal adhesion protein, from murine limbs causes defects in endochondral ossification and dwarfism. The mutant long bones were shorter but wider, and the growth plates became disorganized, especially in the proliferative zone. With two-photon time-lapse imaging of bone explant culture, we provide direct evidence showing that α-parvin regulates chondrocyte rotation, a process essential for chondrocytes to form columnar structure. Furthermore, loss of α-parvin increased binucleation, elevated cell death, and caused dilation of the resting zones of mature growth plates. Single-cell RNA-seq analyses revealed alterations of transcriptome in all three zones (i.e., resting, proliferative, and hypertrophic zones) of the growth plates. Our results demonstrate a crucial role of α-parvin in long bone development and shed light on the cellular mechanism through which α-parvin regulates the longitudinal growth of long bones.
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Affiliation(s)
- Jifan Yuan
- Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Department of Biology, School of Life Sciences, Southern University of Science and Technology, Shenzhen, 518055, China
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, 999077, China
| | - Ling Guo
- Shenzhen Key Laboratory of Epigenetics and Precision Medicine for Cancers, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital & Shenzhen Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Shenzhen, China
| | - Jiaxin Wang
- Shenzhen Key Laboratory of Epigenetics and Precision Medicine for Cancers, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital & Shenzhen Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Shenzhen, China
| | - Zhongjun Zhou
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, 999077, China.
| | - Chuanyue Wu
- Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Department of Biology, School of Life Sciences, Southern University of Science and Technology, Shenzhen, 518055, China.
- Department of Pathology, School of Medicine, University of Pittsburgh, Pittsburgh, PA, 15261, USA.
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Solidum JGN, Jeong Y, Heralde F, Park D. Differential regulation of skeletal stem/progenitor cells in distinct skeletal compartments. Front Physiol 2023; 14:1137063. [PMID: 36926193 PMCID: PMC10013690 DOI: 10.3389/fphys.2023.1137063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Accepted: 02/16/2023] [Indexed: 03/06/2023] Open
Abstract
Skeletal stem/progenitor cells (SSPCs), characterized by self-renewal and multipotency, are essential for skeletal development, bone remodeling, and bone repair. These cells have traditionally been known to reside within the bone marrow, but recent studies have identified the presence of distinct SSPC populations in other skeletal compartments such as the growth plate, periosteum, and calvarial sutures. Differences in the cellular and matrix environment of distinct SSPC populations are believed to regulate their stemness and to direct their roles at different stages of development, homeostasis, and regeneration; differences in embryonic origin and adjacent tissue structures also affect SSPC regulation. As these SSPC niches are dynamic and highly specialized, changes under stress conditions and with aging can alter the cellular composition and molecular mechanisms in place, contributing to the dysregulation of local SSPCs and their activity in bone regeneration. Therefore, a better understanding of the different regulatory mechanisms for the distinct SSPCs in each skeletal compartment, and in different conditions, could provide answers to the existing knowledge gap and the impetus for realizing their potential in this biological and medical space. Here, we summarize the current scientific advances made in the study of the differential regulation pathways for distinct SSPCs in different bone compartments. We also discuss the physical, biological, and molecular factors that affect each skeletal compartment niche. Lastly, we look into how aging influences the regenerative capacity of SSPCs. Understanding these regulatory differences can open new avenues for the discovery of novel treatment approaches for calvarial or long bone repair.
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Affiliation(s)
- Jea Giezl Niedo Solidum
- Department of Biochemistry and Molecular Biology, College of Medicine, University of the Philippines Manila, Manila, Philippines
- Department of Molecular and Human Genetics, Houston, TX, United States
| | - Youngjae Jeong
- Department of Molecular and Human Genetics, Houston, TX, United States
| | - Francisco Heralde
- Department of Biochemistry and Molecular Biology, College of Medicine, University of the Philippines Manila, Manila, Philippines
| | - Dongsu Park
- Department of Molecular and Human Genetics, Houston, TX, United States
- Center for Skeletal Biology, Baylor College of Medicine, Houston, TX, United States
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Heterozygous LRP1 deficiency causes developmental dysplasia of the hip by impairing triradiate chondrocytes differentiation due to inhibition of autophagy. Proc Natl Acad Sci U S A 2022; 119:e2203557119. [PMID: 36067312 PMCID: PMC9477389 DOI: 10.1073/pnas.2203557119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Developmental dysplasia of the hip (DDH) is one of the most common congenital skeletal malformations; however, its etiology remains unclear. Here, we conducted whole-exome sequencing and identified likely pathogenic variants in the LRP1 (low-density lipoprotein receptor-related protein 1) gene in two families and seven unrelated patients. We found that the timing of triradiate cartilage development was brought forward 1 or 2 wk earlier in the LRP-deficient mice, which leads to malformation of the acetabulum and femoral head. Furthermore, Lrp1 deficiency caused a significant decrease of chondrogenic ability in vitro. Our study reveals a critical role of LRP1 in the etiology and pathogenesis of DDH, opening an avenue for its treatment. Developmental dysplasia of the hip (DDH) is one of the most common congenital skeletal malformations; however, its etiology remains unclear. Here, we conducted whole-exome sequencing in eight DDH families followed by targeted sequencing of 68 sporadic DDH patients. We identified likely pathogenic variants in the LRP1 (low-density lipoprotein receptor-related protein 1) gene in two families and seven unrelated patients. All patients harboring the LRP1 variants presented a typical DDH phenotype. The heterozygous Lrp1 knockout (KO) mouse (Lrp1+/−) showed phenotypes recapitulating the human DDH phenotypes, indicating Lrp1 loss of function causes DDH. Lrp1 knockin mice with a missense variant corresponding to a human variant identified in DDH (Lrp1R1783W) also presented DDH phenotypes, which were milder in heterozygotes and severer in homozygotes than those of the Lrp1 KO mouse. The timing of triradiate cartilage development was brought forward 1 or 2 wk earlier in the LRP-deficient mice, which leads to malformation of the acetabulum and femoral head. Furthermore, Lrp1 deficiency caused a significant decrease of chondrogenic ability in vitro. During the chondrogenic induction of mice bone marrow stem cells and ATDC5 (an inducible chondrogenic cell line), Lrp1 deficiency caused decreased autophagy levels with significant β-catenin up-regulation and suppression of chondrocyte marker genes. The expression of chondrocyte markers was rescued by PNU-74654 (a β-catenin antagonist) in an shRNA-Lrp1–expressed ATDC5 cell. Our study reveals a critical role of LRP1 in the etiology and pathogenesis of DDH, opening an avenue for its treatment.
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Abubakar AA, Ali AK, Ibrahim SM, Handool KO, Khan MS, Mustapha NM, Ibrahim TAT, Kaka U, Yusof LM. Roles of Sodium Hydrogen Exchanger (NHE1) and Anion Exchanger (AE2) across Chondrocytes Plasma Membrane during Longitudinal Bone Growth. MEMBRANES 2022; 12:membranes12070707. [PMID: 35877910 PMCID: PMC9321928 DOI: 10.3390/membranes12070707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Revised: 06/27/2022] [Accepted: 06/30/2022] [Indexed: 12/10/2022]
Abstract
Mammalian long bone growth occurs through endochondral ossification, majorly regulated by the controlled enlargement of chondrocytes at the growth plate (GP). This study aimed to investigate the roles of Na+/H+ (sodium hydrogen exchanger (NHE1)) and HCO3− (anion exchanger [AE2]) during longitudinal bone growth in mammals. Bones from P10 SpragueDawley rat pups were cultured exvivo in the presence or absence of NHE1 and AE2 inhibitors to determine their effect on long bone growth. Gross morphometry, histomorphometry, and immunohistochemistry were used to assess the bone growth. The results revealed that the culture of the bones in the presence of NHE1 and AE2 inhibitors reduces bone growth significantly (p < 0.05) by approximately 11%. The inhibitor significantly (p < 0.05) reduces bone growth velocity and the length of the hypertrophic chondrocyte zone without any effect on the total GP length. The total GP chondrocyte density was significantly (p < 0.05) reduced, but hypertrophic chondrocyte densities remained constant. NHE1 fluorescence signaling across the GP length was higher than AE2, and their localization was significantly (p < 0.05) inhibited at the hypertrophic chondrocytes zone. The GP lengthening was majorly driven by an increase in the overall GP chondrocyte and hypertrophic chondrocyte densities apart from the regulatory volume phenomenon. This may suggest that NHE1 and AE2 could have a regulatory role in long bone growth.
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Affiliation(s)
- Adamu Abdul Abubakar
- Department of Companion Animal Medicine and Surgery, Universiti Putra Malaysia, Serdang 43400, Malaysia; (A.A.A.); (A.K.A.); (S.M.I.); (K.O.H.); (M.S.K.); (U.K.)
- Department of Veterinary Surgery and Radiology, Usmanu Danfodiyo University, Sokoto PMB 2346, Nigeria
| | - Ahmed Khalaf Ali
- Department of Companion Animal Medicine and Surgery, Universiti Putra Malaysia, Serdang 43400, Malaysia; (A.A.A.); (A.K.A.); (S.M.I.); (K.O.H.); (M.S.K.); (U.K.)
- Department of Surgery and Theriogenology, College of Veterinary Medicine, University of Mosul, Mosul 00964, Iraq
| | - Sahar Mohammed Ibrahim
- Department of Companion Animal Medicine and Surgery, Universiti Putra Malaysia, Serdang 43400, Malaysia; (A.A.A.); (A.K.A.); (S.M.I.); (K.O.H.); (M.S.K.); (U.K.)
- Department of Surgery and Theriogenology, College of Veterinary Medicine, University of Mosul, Mosul 00964, Iraq
| | - Kareem Obayes Handool
- Department of Companion Animal Medicine and Surgery, Universiti Putra Malaysia, Serdang 43400, Malaysia; (A.A.A.); (A.K.A.); (S.M.I.); (K.O.H.); (M.S.K.); (U.K.)
| | - Mohammad Shuaib Khan
- Department of Companion Animal Medicine and Surgery, Universiti Putra Malaysia, Serdang 43400, Malaysia; (A.A.A.); (A.K.A.); (S.M.I.); (K.O.H.); (M.S.K.); (U.K.)
- Faculty of Veterinary and Animal Science, Gomal University, Dera Ismail Khan 29050, Pakistan
| | - Noordin Mohamed Mustapha
- Department of Veterinary Pathology and Microbiology, Universiti Putra Malaysia, Serdang 43400, Malaysia;
| | | | - Ubedullah Kaka
- Department of Companion Animal Medicine and Surgery, Universiti Putra Malaysia, Serdang 43400, Malaysia; (A.A.A.); (A.K.A.); (S.M.I.); (K.O.H.); (M.S.K.); (U.K.)
| | - Loqman Mohamad Yusof
- Department of Companion Animal Medicine and Surgery, Universiti Putra Malaysia, Serdang 43400, Malaysia; (A.A.A.); (A.K.A.); (S.M.I.); (K.O.H.); (M.S.K.); (U.K.)
- Correspondence: ; Tel.: +60-192-590-571; Fax: +60-386-093-959
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Septoclasts expressing epidermal fatty acid-binding protein (E-FABP, FABP5) in endochondral ossification. J Oral Biosci 2021; 64:18-25. [PMID: 34915120 DOI: 10.1016/j.job.2021.12.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/06/2021] [Accepted: 12/07/2021] [Indexed: 01/11/2023]
Abstract
BACKGROUND Long-chain fatty acids (LCFAs) and retinoic acid (RA) are abundant in the growth plates (GPs) of long bones; however, their roles have not been elucidated. We observed that epidermal fatty acid-binding protein (E-FABP/FABP5) with a high affinity for both LCFAs and RA is exclusively expressed in the septoclasts located at the chondro-osseous junction (COJ) of the GP. HIGHLIGHTS E-FABP expressed in septoclasts is involved in both LCFA metabolism and RA signaling as an intracellular transporter of both LCFAs and RA. Septoclasts with shortened cytoplasmic processes are associated with cartilage resorptive activity downregulation because of E-FABP deficiency or excess or deficiency of RA. In ontogeny, the septoclasts are differentiated from the pericytes and involved in the resorption of the uncalcified matrix of the cartilage templates in endochondral ossification. CONCLUSION Septoclasts originate from pericytes and express E-FABP to play crucial roles in uncalcified matrix resorption by LCFA metabolism and RA signaling during endochondral ossification.
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Nakamura M, Yang MC, Ashida K, Mayanagi M, Sasano Y. Calcification and resorption of mouse Meckel's cartilage analyzed by von Kossa and tartrate-resistant acid phosphatase histochemistry and scanning electron microscopy/energy-dispersive X-ray spectrometry. Anat Sci Int 2021; 97:213-220. [PMID: 34859366 DOI: 10.1007/s12565-021-00643-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 11/24/2021] [Indexed: 11/30/2022]
Abstract
Meckel's cartilage is essential for the normal development of the mandible. The fate of the intermediate portion of Meckel's cartilage is unique as most of it disappears soon after birth except for the part that forms the sphenomandibular ligament. The mechanism of the disappearance of Meckel's cartilage is unknown; therefore, this study was designed to investigate the process of Meckel's cartilage degradation, focusing on cartilage matrix calcification and the appearance of chondroclasts. Developing mouse mandibles at embryonic days 15, 16, 17, and 18, and postnatal day 2 were processed for whole-mount staining with alcian blue and alizarin red. The mandibles on embryonic days 15, 16, 17, and 18 were fixed and embedded in paraffin. Adjacent sections were processed for von Kossa and tartrate-resistant acid phosphatase (TRAP) histochemistry and scanning electron microscopy/energy-dispersive X-ray spectrometry (SEM/EDS). Calcification and the element concentrations of calcium, phosphorus, and carbon were examined with von Kossa histochemistry and SEM/EDS. The involvement of chondroclasts was investigated using TRAP histochemistry. The results demonstrated that the intermediate portion of Meckel's cartilage is resorbed by chondroclasts after chondrocyte hypertrophy and cartilage matrix calcification and that the mineral concentration of calcified Meckel's cartilage is comparable to that of the surrounding bone. This study contributes to the understanding of the mechanism of Meckel's cartilage resorption and provides useful insights into the development of the mandible.
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Affiliation(s)
- Megumi Nakamura
- Division of Craniofacial Development and Tissue Biology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan.
| | - Mu-Chen Yang
- Division of Craniofacial Development and Tissue Biology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan
| | - Keijyu Ashida
- Division of Craniofacial Development and Tissue Biology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan
| | - Miyuki Mayanagi
- Division of Craniofacial Development and Tissue Biology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan
| | - Yasuyuki Sasano
- Division of Craniofacial Development and Tissue Biology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan
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Kazemi M, Williams JL. Properties of Cartilage-Subchondral Bone Junctions: A Narrative Review with Specific Focus on the Growth Plate. Cartilage 2021; 13:16S-33S. [PMID: 32458695 PMCID: PMC8804776 DOI: 10.1177/1947603520924776] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVE The purpose of this narrative review is to summarize what is currently known about the structural, chemical, and mechanical properties of cartilage-bone interfaces, which provide tissue integrity across a bimaterial interface of 2 very different structural materials. Maintaining these mechanical interfaces is a key factor for normal bone growth and articular cartilage function and maintenance. MATERIALS AND METHODS A comprehensive search was conducted using Google Scholar and PubMed/Medline with a specific focus on the growth plate cartilage-subchondral bone interface. All original articles, reviews in journals, and book chapters were considered. Following a review of the overall structural and functional characteristics of the physis, the literature on histological studies of both articular and growth plate chondro-osseous junctions is briefly reviewed. Next the literature on biochemical properties of these interfaces is reviewed, specifically the literature on elemental analyses across the cartilage-subchondral bone junctions. The literature on biomechanical studies of these junctions at the articular and physeal interfaces is also reviewed and compared. RESULTS Unlike the interface between articular cartilage and bone, growth plate cartilage has 2 chondro-osseous junctions. The reserve zone of the mature growth plate is intimately connected to a plate of subchondral bone on the epiphyseal side. This interface resembles that between the subchondral bone and articular cartilage, although much less is known about its makeup and formation. CONCLUSION There is a notably paucity of information available on the structural and mechanical properties of reserve zone-subchondral epiphyseal bone interface. This review reveals that further studies are needed on the microstructural and mechanical properties of chondro-osseous junction with the reserve zone.
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Affiliation(s)
- Masumeh Kazemi
- Biomedical Engineering Department,
University of Memphis, Memphis, TN, USA,Masumeh Kazemi, Biomedical Engineering
Department, University of Memphis, 3796 Norriswood Avenue, Memphis, TN 38152,
USA.
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Wong SA, Hu DP, Slocum J, Lam C, Nguyen M, Miclau T, Marcucio RS, Bahney CS. Chondrocyte-to-osteoblast transformation in mandibular fracture repair. J Orthop Res 2021; 39:1622-1632. [PMID: 33140859 PMCID: PMC8451921 DOI: 10.1002/jor.24904] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Revised: 10/01/2020] [Accepted: 10/31/2020] [Indexed: 02/04/2023]
Abstract
The majority of fracture research has been conducted using long bone fracture models, with significantly less research into the mechanisms driving craniofacial repair. However, craniofacial bones differ from long bones in both their developmental mechanism and embryonic origin. Thus, it is possible that their healing mechanisms could differ. In this study we utilize stabilized and unstabilized mandible fracture models to investigate the pathways regulating repair. Whereas fully stable trephine defects in the ramus form bone directly, mechanical motion within a transverse fracture across the same anatomical location promoted robust cartilage formation before boney remodeling. Literature investigating long bone fractures show chondrocytes are a direct precursor of osteoblasts during endochondral repair. Lineage tracing with Aggrecan-CreERT2 ::Ai9 tdTomato mice demonstrated that mandibular callus chondrocytes also directly contribute to the formation of new bone. Furthermore, immunohistochemistry revealed that chondrocytes located at the chondro-osseous junction expressed Sox2, suggesting that plasticity of these chondrocytes may facilitate this chondrocyte-to-osteoblast transformation. Based on the direct role chondrocytes play in bone repair, we tested the efficacy of cartilage grafts in healing critical-sized mandibular defects. Whereas empty defects remained unbridged and filled with fibrous tissue, cartilage engraftment produced bony-bridging and robust marrow cavity formation, indicating healthy vascularization of the newly formed bone. Engrafted cartilage directly contributed to new bone formation since a significant portion of the newly formed bone was graft/donor-derived. Taken together these data demonstrate the important role of chondrocyte-to-osteoblast transformation during mandibular endochondral repair and the therapeutic promise of using cartilage as a tissue graft to heal craniofacial defects.
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Affiliation(s)
- Sarah A. Wong
- Department of Orthopaedic Surgery, Orthopaedic Trauma InstituteUniversity of California2550 23rd Street Building 9, 3rd FloorSan FranciscoCalifornia94110USA,Oral and Craniofacial Sciences Program, School of DentistryUniversity of CaliforniaSan FranciscoCaliforniaUSA
| | - Diane P. Hu
- Department of Orthopaedic Surgery, Orthopaedic Trauma InstituteUniversity of California2550 23rd Street Building 9, 3rd FloorSan FranciscoCalifornia94110USA
| | - Joshua Slocum
- Department of Orthopaedic Surgery, Orthopaedic Trauma InstituteUniversity of California2550 23rd Street Building 9, 3rd FloorSan FranciscoCalifornia94110USA
| | - Charles Lam
- Department of Orthopaedic Surgery, Orthopaedic Trauma InstituteUniversity of California2550 23rd Street Building 9, 3rd FloorSan FranciscoCalifornia94110USA
| | - Michael Nguyen
- Department of Orthopaedic Surgery, Orthopaedic Trauma InstituteUniversity of California2550 23rd Street Building 9, 3rd FloorSan FranciscoCalifornia94110USA,Oral and Craniofacial Sciences Program, School of DentistryUniversity of CaliforniaSan FranciscoCaliforniaUSA
| | - Theodore Miclau
- Department of Orthopaedic Surgery, Orthopaedic Trauma InstituteUniversity of California2550 23rd Street Building 9, 3rd FloorSan FranciscoCalifornia94110USA
| | - Ralph S. Marcucio
- Department of Orthopaedic Surgery, Orthopaedic Trauma InstituteUniversity of California2550 23rd Street Building 9, 3rd FloorSan FranciscoCalifornia94110USA,Oral and Craniofacial Sciences Program, School of DentistryUniversity of CaliforniaSan FranciscoCaliforniaUSA
| | - Chelsea S. Bahney
- Department of Orthopaedic Surgery, Orthopaedic Trauma InstituteUniversity of California2550 23rd Street Building 9, 3rd FloorSan FranciscoCalifornia94110USA,Steadman Philippon Research InstituteCenter for Regenerative Sports Medicine181 W Meadows DriveVailColorado81657USA
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Mizoguchi T, Ono N. The diverse origin of bone-forming osteoblasts. J Bone Miner Res 2021; 36:1432-1447. [PMID: 34213032 PMCID: PMC8338797 DOI: 10.1002/jbmr.4410] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 06/29/2021] [Accepted: 06/29/2021] [Indexed: 12/17/2022]
Abstract
Osteoblasts are the only cells that can give rise to bones in vertebrates. Thus, one of the most important functions of these metabolically active cells is mineralized matrix production. Because osteoblasts have a limited lifespan, they must be constantly replenished by preosteoblasts, their immediate precursors. Because disruption of the regulation of bone-forming osteoblasts results in a variety of bone diseases, a better understanding of the origin of these cells by defining the mechanisms of bone development, remodeling, and regeneration is central to the development of novel therapeutic approaches. In recent years, substantial new insights into the origin of osteoblasts-largely owing to rapid technological advances in murine lineage-tracing approaches and other single-cell technologies-have been obtained. Collectively, these findings indicate that osteoblasts involved in bone formation under various physiological, pathological, and therapeutic conditions can be obtained from numerous sources. The origins of osteoblasts include, but are not limited to, chondrocytes in the growth plate, stromal cells in the bone marrow, quiescent bone-lining cells on the bone surface, and specialized fibroblasts in the craniofacial structures, such as sutures and periodontal ligaments. Because osteoblasts can be generated from local cellular sources, bones can flexibly respond to regenerative and anabolic cues. However, whether osteoblasts derived from different cellular sources have distinct functions remains to be investigated. Currently, we are at the initial stage to aptly unravel the incredible diversity of the origins of bone-forming osteoblasts. © 2021 American Society for Bone and Mineral Research (ASBMR).
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Affiliation(s)
| | - Noriaki Ono
- University of Texas Health Science Center at Houston School of Dentistry, Houston, TX, USA
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Abstract
Transforming growth factor-beta2 (TGF-β2) is recognized as a versatile cytokine that plays a vital role in regulation of joint development, homeostasis, and diseases, but its role as a biological mechanism is understood far less than that of its counterpart, TGF-β1. Cartilage as a load-resisting structure in vertebrates however displays a fragile performance when any tissue disturbance occurs, due to its lack of blood vessels, nerves, and lymphatics. Recent reports have indicated that TGF-β2 is involved in the physiological processes of chondrocytes such as proliferation, differentiation, migration, and apoptosis, and the pathological progress of cartilage such as osteoarthritis (OA) and rheumatoid arthritis (RA). TGF-β2 also shows its potent capacity in the repair of cartilage defects by recruiting autologous mesenchymal stem cells and promoting secretion of other growth factor clusters. In addition, some pioneering studies have already considered it as a potential target in the treatment of OA and RA. This article aims to summarize the current progress of TGF-β2 in cartilage development and diseases, which might provide new cues for remodelling of cartilage defect and intervention of cartilage diseases.
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Affiliation(s)
- Mengmeng Duan
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Qingxuan Wang
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Yang Liu
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Jing Xie
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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12
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Li G, Rao H, Xu W. Puerarin plays a protective role in chondrocytes by activating Beclin1-dependent autophagy. Biosci Biotechnol Biochem 2021; 85:621-625. [PMID: 33624774 DOI: 10.1093/bbb/zbaa078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 11/05/2020] [Indexed: 11/14/2022]
Abstract
Puerarin can protect chondrocytes, whereby ameliorating osteoarthritis. Puerarin also promotes autophagy. Autophagy maintains chondrocyte homeostasis. The role of autophagy in puerarin-protected chondrocytes is unknown. Puerarin promoted chondrocyte autophagy. Puerarin-protected chondrocytes were reversed by autophagy inhibitors and Beclin1 inhibitor. 3-MA or Beclin1 inhibitor in vivo reversed puerarin-ameliorated cartilage damage of osteoarthritis mice. Thus, puerarin can protect chondrocytes through Beclin1-dependent autophagy activation.
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Affiliation(s)
- Guishuang Li
- Department of orthopedics, The First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian, China
| | - Hongming Rao
- Department of orthopedics, The First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian, China
| | - Weihong Xu
- Department of orthopedics, The First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian, China
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13
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Blumer MJF. Bone tissue and histological and molecular events during development of the long bones. Ann Anat 2021; 235:151704. [PMID: 33600952 DOI: 10.1016/j.aanat.2021.151704] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Revised: 01/07/2021] [Accepted: 01/27/2021] [Indexed: 12/20/2022]
Abstract
The bones are of mesenchymal or ectomesenchymal origin, form the skeleton of most vertebrates, and are essential for locomotion and organ protection. As a living tissue they are highly vascularized and remodelled throughout life to maintain intact. Bones consist of osteocytes entrapped in a mineralized extracellular matrix, and via their elaborated network of cytoplasmic processes they do not only communicate with each other but also with the cells on the bone surface (bone lining cells). Bone tissue develops through a series of fine-tuned processes, and there are two modes of bone formation, referred to either as intramembranous or endochondral ossification. In intramembranous ossification, bones develop directly from condensations of mesenchymal cells, and the flat bones of the skull, the clavicles and the perichondral bone cuff develop via this process. The bones of the axial (ribs and vertebrae) and the appendicular skeleton (e.g. upper and lower limbs) form through endochondral ossification where mesenchyme turns into a cartilaginous intermediate with the shape of the future skeletal element that is gradually replaced by bone. Endochondral ossification occurs in all vertebrate taxa and its onset involves differentiation of the chondrocytes, mineralization of the extracellular cartilage matrix and vascularization of the intermediate, followed by disintegration and resorption of the cartilage, bone formation, and finally - after complete ossification of the cartilage model - the establishment of an avascular articular cartilage. The epiphyseal growth plate regulates the longitudinal growth of the bones, achieved by a balanced proliferation and elimination of chondrocytes, and the question whether the late hypertrophic chondrocytes die or transform into osteogenic cells is still being hotly debated. The complex processes leading to endochondral ossification have been studied for over a century, and this review aims to give an overview of the histological and molecular events, arising from the long bones' (e.g. femur, tibia) development. The fate of the hypertrophic chondrocytes will be discussed in the light of new findings obtained from cell tracking studies.
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Affiliation(s)
- Michael J F Blumer
- Department of Anatomy, Histology and Embryology, Institute of Clinical and Functional Anatomy, Medical University Innsbruck, Müllerstrasse 59, A-6010 Innsbruck, Austria.
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14
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Fernández-Iglesias Á, Fuente R, Gil-Peña H, Alonso-Durán L, Santos F, López JM. The Formation of the Epiphyseal Bone Plate Occurs via Combined Endochondral and Intramembranous-Like Ossification. Int J Mol Sci 2021; 22:ijms22020900. [PMID: 33477458 PMCID: PMC7830543 DOI: 10.3390/ijms22020900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 01/08/2021] [Accepted: 01/15/2021] [Indexed: 11/24/2022] Open
Abstract
The formation of the epiphyseal bone plate, the flat bony structure that provides strength and firmness to the growth plate cartilage, was studied in the present study by using light, confocal, and scanning electron microscopy. Results obtained evidenced that this bone tissue is generated by the replacement of the lower portion of the epiphyseal cartilage. However, this process differs considerably from the usual bone tissue formation through endochondral ossification. Osteoblasts deposit bone matrix on remnants of mineralized cartilage matrix that serve as a scaffold, but also on non-mineralized cartilage surfaces and as well as within the perivascular space. These processes occur simultaneously at sites located close to each other, so that, a core of the sheet of bone is established very quickly. Subsequently, thickening and reshaping occurs by appositional growth to generate a dense parallel-fibered bone structurally intermediate between woven and lamellar bone. All these processes occur in close relationship with a cartilage but most of the bone tissue is generated in a manner that may be considered as intramembranous-like. Overall, the findings here reported provide for the first time an accurate description of the tissues and events involved in the formation of the epiphyseal bone plate and gives insight into the complex cellular events underlying bone formation at different sites on the skeleton.
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Affiliation(s)
- Ángela Fernández-Iglesias
- Division of Pediatrics, Department of Medicine, Faculty of Medicine, University of Oviedo, 33006 Oviedo, Asturias, Spain; (Á.F.-I.); (R.F.); (H.G.-P.); (L.A.-D.); (F.S.)
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33011 Oviedo, Asturias, Spain
| | - Rocío Fuente
- Division of Pediatrics, Department of Medicine, Faculty of Medicine, University of Oviedo, 33006 Oviedo, Asturias, Spain; (Á.F.-I.); (R.F.); (H.G.-P.); (L.A.-D.); (F.S.)
| | - Helena Gil-Peña
- Division of Pediatrics, Department of Medicine, Faculty of Medicine, University of Oviedo, 33006 Oviedo, Asturias, Spain; (Á.F.-I.); (R.F.); (H.G.-P.); (L.A.-D.); (F.S.)
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33011 Oviedo, Asturias, Spain
- Department of Pediatrics, Hospital Universitario Central de Asturias (HUCA), 33011 Oviedo, Asturias, Spain
| | - Laura Alonso-Durán
- Division of Pediatrics, Department of Medicine, Faculty of Medicine, University of Oviedo, 33006 Oviedo, Asturias, Spain; (Á.F.-I.); (R.F.); (H.G.-P.); (L.A.-D.); (F.S.)
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33011 Oviedo, Asturias, Spain
| | - Fernando Santos
- Division of Pediatrics, Department of Medicine, Faculty of Medicine, University of Oviedo, 33006 Oviedo, Asturias, Spain; (Á.F.-I.); (R.F.); (H.G.-P.); (L.A.-D.); (F.S.)
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33011 Oviedo, Asturias, Spain
- Department of Pediatrics, Hospital Universitario Central de Asturias (HUCA), 33011 Oviedo, Asturias, Spain
| | - José Manuel López
- Division of Pediatrics, Department of Medicine, Faculty of Medicine, University of Oviedo, 33006 Oviedo, Asturias, Spain; (Á.F.-I.); (R.F.); (H.G.-P.); (L.A.-D.); (F.S.)
- Department of Morphology and Cellular Biology, Faculty of Medicine, University of Oviedo, 33006 Oviedo, Asturias, Spain
- Correspondence:
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15
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Boraldi F, Lofaro FD, Quaglino D. Apoptosis in the Extraosseous Calcification Process. Cells 2021; 10:cells10010131. [PMID: 33445441 PMCID: PMC7827519 DOI: 10.3390/cells10010131] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 01/07/2021] [Accepted: 01/10/2021] [Indexed: 12/13/2022] Open
Abstract
Extraosseous calcification is a pathologic mineralization process occurring in soft connective tissues (e.g., skin, vessels, tendons, and cartilage). It can take place on a genetic basis or as a consequence of acquired chronic diseases. In this last case, the etiology is multifactorial, including both extra- and intracellular mechanisms, such as the formation of membrane vesicles (e.g., matrix vesicles and apoptotic bodies), mitochondrial alterations, and oxidative stress. This review is an overview of extraosseous calcification mechanisms focusing on the relationships between apoptosis and mineralization in cartilage and vascular tissues, as these are the two tissues mostly affected by a number of age-related diseases having a progressively increased impact in Western Countries.
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Affiliation(s)
- Federica Boraldi
- Department of Life Sciences, University of Modena and Reggio Emilia, 41125 Modena, Italy; (F.D.L.); (D.Q.)
- Correspondence:
| | - Francesco Demetrio Lofaro
- Department of Life Sciences, University of Modena and Reggio Emilia, 41125 Modena, Italy; (F.D.L.); (D.Q.)
| | - Daniela Quaglino
- Department of Life Sciences, University of Modena and Reggio Emilia, 41125 Modena, Italy; (F.D.L.); (D.Q.)
- Interuniversity Consortium for Biotechnologies (CIB), Italy
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16
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Shah HN, Jones RE, Borrelli MR, Robertson K, Salhotra A, Wan DC, Longaker MT. Craniofacial and Long Bone Development in the Context of Distraction Osteogenesis. Plast Reconstr Surg 2021; 147:54e-65e. [PMID: 33370054 PMCID: PMC7773036 DOI: 10.1097/prs.0000000000007451] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Bone retains regenerative potential into adulthood, and surgeons harness this plasticity during distraction osteogenesis. The underlying biology governing bone development, repair, and regeneration is divergent between the craniofacial and appendicular skeleton. Each type of bone formation is characterized by unique molecular signaling and cellular behavior. Recent discoveries have elucidated the cellular and genetic processes underlying skeletal development and regeneration, providing an opportunity to couple biological and clinical knowledge to improve patient care. METHODS A comprehensive literature review of basic and clinical literature regarding craniofacial and long bone development, regeneration, and distraction osteogenesis was performed. RESULTS The current understanding in craniofacial and long bone development and regeneration is discussed, and clinical considerations for the respective distraction osteogenesis procedures are presented. CONCLUSIONS Distraction osteogenesis is a powerful tool to regenerate bone and thus address a number of craniofacial and appendicular skeletal deficiencies. The molecular mechanisms underlying bone regeneration, however, remain elusive. Recent work has determined that embryologic morphogen gradients constitute important signals during regeneration. In addition, striking discoveries have illuminated the cellular processes underlying mandibular regeneration during distraction osteogenesis, showing that skeletal stem cells reactivate embryologic neural crest transcriptomic processes to carry out bone formation during regeneration. Furthermore, innovative adjuvant therapies to complement distraction osteogenesis use biological processes active in embryogenesis and regeneration. Additional research is needed to further characterize the underlying cellular mechanisms responsible for improved bone formation through adjuvant therapies and the role skeletal stem cells play during regeneration.
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Affiliation(s)
- Harsh N. Shah
- Department of Surgery, Division of Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Ruth E. Jones
- Department of Surgery, Division of Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA
| | - Mimi R. Borrelli
- Department of Surgery, Division of Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA
| | - Kiana Robertson
- Department of Surgery, Division of Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA
| | - Ankit Salhotra
- Department of Surgery, Division of Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Derrick C. Wan
- Department of Surgery, Division of Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA
| | - Michael T. Longaker
- Department of Surgery, Division of Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, CA, USA
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, USA
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17
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Kegelman CD, Collins JM, Nijsure MP, Eastburn EA, Boerckel JD. Gone Caving: Roles of the Transcriptional Regulators YAP and TAZ in Skeletal Development. Curr Osteoporos Rep 2020; 18:526-540. [PMID: 32712794 PMCID: PMC8040027 DOI: 10.1007/s11914-020-00605-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
PURPOSE OF REVIEW The development of the skeleton is controlled by cellular decisions determined by the coordinated activation of multiple transcription factors. Recent evidence suggests that the transcriptional regulator proteins, Yes-associated protein (YAP) and transcriptional co-activator with PDZ-binding motif (TAZ), could have important roles in directing the activity of these transcriptional programs. However, in vitro evidence for the roles of YAP and TAZ in skeletal cells has been hopelessly contradictory. The goals of this review are to provide a cross-sectional view on the state of the field and to synthesize the available data toward a unified perspective. RECENT FINDINGS YAP and TAZ are regulated by diverse upstream signals and interact downstream with multiple transcription factors involved in skeletal development, positioning YAP and TAZ as important signal integration nodes in an hourglass-shaped signaling pathway. Here, we provide a survey of putative transcriptional co-effectors for YAP and TAZ in skeletal cells. Synthesizing the in vitro data, we conclude that TAZ is consistently pro-osteogenic in function, while YAP can exhibit either pro- or anti-osteogenic activity depending on cell type and context. Synthesizing the in vivo data, we conclude that YAP and TAZ combinatorially promote developmental bone formation, bone matrix homeostasis, and endochondral fracture repair by regulating a variety of transcriptional programs depending on developmental stage. Here, we discuss the current understanding of the roles of the transcriptional regulators YAP and TAZ in skeletal development, and provide recommendations for continued study of molecular mechanisms, mechanotransduction, and therapeutic implications for skeletal disease.
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Affiliation(s)
- Christopher D Kegelman
- McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania, 376A Stemmler Hall, Philadelphia, PA, USA
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, USA
| | - Joseph M Collins
- McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania, 376A Stemmler Hall, Philadelphia, PA, USA
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, USA
| | - Madhura P Nijsure
- McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania, 376A Stemmler Hall, Philadelphia, PA, USA
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, USA
| | - Emily A Eastburn
- McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania, 376A Stemmler Hall, Philadelphia, PA, USA
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, USA
| | - Joel D Boerckel
- McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania, 376A Stemmler Hall, Philadelphia, PA, USA.
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, USA.
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18
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Li X, Xu J, Dai B, Wang X, Guo Q, Qin L. Targeting autophagy in osteoporosis: From pathophysiology to potential therapy. Ageing Res Rev 2020; 62:101098. [PMID: 32535273 DOI: 10.1016/j.arr.2020.101098] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 05/26/2020] [Accepted: 06/03/2020] [Indexed: 12/19/2022]
Abstract
Osteoporosis is a highly prevalent disorder characterized by the loss of bone mass and microarchitecture deterioration of bone tissue, attributed to various factors, including menopause (primary), aging (primary) and adverse effects of relevant medications (secondary). In recent decades, knowledge regarding the etiological mechanisms underpinning osteoporosis emphasizes that bone cellular homeostasis, including the maintenance of cell functions, differentiation, and the response to stress, is tightly regulated by autophagy, which is a cell survival mechanism for eliminating and recycling damaged proteins and organelles. With the important roles in the maintenance of cellular homeostasis and organ function, autophagy has emerged as a potential target for the prevention and treatment of osteoporosis. In this review, we update and discuss the pathophysiology of autophagy in normal bone cell life cycle and metabolism. Then, the alternations of autophagy in primary and secondary osteoporosis, and the accompanied pathological process are discussed. Finally, we discuss current strategies, limitations, and challenges involved in targeting relevant pathways and propose strategies by which such hurdles may be circumvented in the future for their translation into clinical validations and applications for the prevention and treatment of osteoporosis.
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19
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Oichi T, Otsuru S, Usami Y, Enomoto-Iwamoto M, Iwamoto M. Wnt signaling in chondroprogenitors during long bone development and growth. Bone 2020; 137:115368. [PMID: 32380258 PMCID: PMC7354209 DOI: 10.1016/j.bone.2020.115368] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 04/14/2020] [Accepted: 04/16/2020] [Indexed: 02/08/2023]
Abstract
Wnt signaling together with other signaling pathways governs cartilage development and the growth plate function during long bone formation and growth. β-catenin-dependent Wnt signaling is a specific lineage determinant of skeletal mesenchymal cells toward chondrogenic or osteogenic direction. Once cartilage forms and the growth plate organize, Wnt signaling continues to regulate proliferation and differentiation of the growth plate chondrocytes. Although chondrocytes in the growth plate have a high capacity to proliferate, new cells must be supplied to the growth plate from chondroprogenitor population. Advances in in vivo cell tracking techniques have demonstrated the importance of Wnt signaling in driving tissue renewal. The Wnt-responsive cells, genetically marked by the Wnt-reporter system, are found as stem cells in various tissues. Similarly, Wnt-responsive cells are found in the periphery of the growth plate and expanded to constitute entire column structure, indicating that Wnt signaling participates in the regulation of chondroprogenitors in the growth plate. This review will discuss advancements in research of progenitors in the growth plate, specifically focusing on Wnt/β-catenin signaling.
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Affiliation(s)
- Takeshi Oichi
- Department of Orthopaedics, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Satoru Otsuru
- Department of Orthopaedics, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Yu Usami
- Department of Oral Pathology, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Motomi Enomoto-Iwamoto
- Department of Orthopaedics, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Masahiro Iwamoto
- Department of Orthopaedics, School of Medicine, University of Maryland, Baltimore, MD, USA.
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20
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Matsushita Y, Ono W, Ono N. Growth plate skeletal stem cells and their transition from cartilage to bone. Bone 2020; 136:115359. [PMID: 32276155 PMCID: PMC7246136 DOI: 10.1016/j.bone.2020.115359] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 03/31/2020] [Accepted: 04/06/2020] [Indexed: 12/15/2022]
Abstract
The growth plate is an essential component of endochondral bone development. Not surprisingly, the growth plate and its surrounding structure, the perichondrium, contain a wealth of skeletal stem cells (SSCs) and progenitor cells that robustly contribute to bone development. Recent in vivo lineage-tracing studies using mouse genetic models provide substantial insight into the diversity and versatility of these skeletal stem and progenitor cell populations, particularly shedding light on the importance of the transition from cartilage to bone. Chondrocytes and perichondrial cells are inseparable twins that develop from condensing undifferentiated mesenchymal cells during the fetal stage; although morphologically and functionally distinct, these cells ultimately serve for the same goal, that is, to make bone bigger and stronger. Even in the postnatal stage, a small subset of growth plate chondrocytes can transform into osteoblasts and marrow stromal cells; this is in part fueled by a unique type of SSCs maintained in the resting zone of the growth plate, which continue to self-renew for the long term. Here, we discuss diverse skeletal stem and progenitor cell populations in the growth plate and the perichondrium and their transition from cartilage to bone.
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Affiliation(s)
- Yuki Matsushita
- University of Michigan School of Dentistry, Ann Arbor, MI 48109, USA
| | - Wanida Ono
- University of Michigan School of Dentistry, Ann Arbor, MI 48109, USA
| | - Noriaki Ono
- University of Michigan School of Dentistry, Ann Arbor, MI 48109, USA.
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21
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Jing Y, Wang Z, Li H, Ma C, Feng J. Chondrogenesis Defines Future Skeletal Patterns Via Cell Transdifferentiation from Chondrocytes to Bone Cells. Curr Osteoporos Rep 2020; 18:199-209. [PMID: 32219639 PMCID: PMC7717675 DOI: 10.1007/s11914-020-00586-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
PURPOSE OF REVIEW The goal of this review is to obtain a better understanding of how chondrogenesis defines skeletal development via cell transdifferentiation from chondrocytes to bone cells. RECENT FINDINGS A breakthrough in cell lineage tracing allows bone biologists to trace the cell fate and demonstrate that hypertrophic chondrocytes can directly transdifferentiate into bone cells during endochondral bone formation. However, there is a knowledge gap for the biological significance of this lineage extension and the mechanisms controlling this process. This review first introduces the history of the debate on the cell fate of chondrocytes in endochondral bone formation; then summarizes key findings obtained in recent years, which strongly support a new theory: the direct cell transdifferentiation from chondrocytes to bone cells precisely connects chondrogenesis (for providing a template of the future skeleton, classified as phase I) and osteogenesis (for finishing skeletal construction, or phase II) in a continuous lineage-linked process of endochondral bone formation and limb elongation; and finally outlines nutrition factors and molecules that regulate the cell transdifferentiation process during the relay from chondrogenesis to osteogenesis.
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Affiliation(s)
- Yan Jing
- Department of Orthodontics, Texas A&M University College of Dentistry, 3302 Gaston ave, Dallas, TX, 75246, USA.
| | - Zheng Wang
- Department of Biomedical Sciences, Texas A&M University College of Dentistry, Dallas, TX, USA
| | - Hui Li
- Department of Biomedical Sciences, Texas A&M University College of Dentistry, Dallas, TX, USA
- State Key Laboratory of Oral Diseases, Department of Traumatic and Plastic Surgery, , West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, 610041, China
| | - Chi Ma
- Department of Research, Texas Scottish Rite Hospital for Children, Dallas, TX, USA
| | - Jian Feng
- Department of Orthodontics, Texas A&M University College of Dentistry, 3302 Gaston ave, Dallas, TX, 75246, USA.
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22
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Abstract
PURPOSE OF REVIEW Bone elongation is a complex process driven by multiple intrinsic (hormones, growth factors) and extrinsic (nutrition, environment) variables. Bones grow in length by endochondral ossification in cartilaginous growth plates at ends of developing long bones. This review provides an updated overview of the important factors that influence this process. RECENT FINDINGS Insulin-like growth factor-1 (IGF-1) is the major hormone required for growth and a drug for treating pediatric skeletal disorders. Temperature is an underrecognized environmental variable that also impacts linear growth. This paper reviews the current state of knowledge regarding the interaction of IGF-1 and environmental factors on bone elongation. Understanding how internal and external variables regulate bone lengthening is essential for developing and improving treatments for an array of bone elongation disorders. Future studies may benefit from understanding how these unique relationships could offer realistic new approaches for increasing bone length in different growth-limiting conditions.
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Affiliation(s)
- Holly L Racine
- Department of Natural Sciences and Mathematics, West Liberty University, West Liberty, WV, 26074, USA
| | - Maria A Serrat
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, 1 John Marshall Drive, Huntington, WV, 25755, USA.
- Department of Clinical and Translational Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, 25755, USA.
- Department of Orthopaedics, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, 25755, USA.
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23
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Fonseca PAS, Suárez-Vega A, Cánovas A. Weighted Gene Correlation Network Meta-Analysis Reveals Functional Candidate Genes Associated with High- and Sub-Fertile Reproductive Performance in Beef Cattle. Genes (Basel) 2020; 11:genes11050543. [PMID: 32408659 PMCID: PMC7290847 DOI: 10.3390/genes11050543] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 05/04/2020] [Accepted: 05/06/2020] [Indexed: 12/13/2022] Open
Abstract
Improved reproductive efficiency could lead to economic benefits for the beef industry, once the intensive selection pressure has led to a decreased fertility. However, several factors limit our understanding of fertility traits, including genetic differences between populations and statistical limitations. In the present study, the RNA-sequencing data from uterine samples of high-fertile (HF) and sub-fertile (SF) animals was integrated using co-expression network meta-analysis, weighted gene correlation network analysis, identification of upstream regulators, variant calling, and network topology approaches. Using this pipeline, top hub-genes harboring fixed variants (HF × SF) were identified in differentially co-expressed gene modules (DcoExp). The functional prioritization analysis identified the genes with highest potential to be key-regulators of the DcoExp modules between HF and SF animals. Consequently, 32 functional candidate genes (10 upstream regulators and 22 top hub-genes of DcoExp modules) were identified. These genes were associated with the regulation of relevant biological processes for fertility, such as embryonic development, germ cell proliferation, and ovarian hormone regulation. Additionally, 100 candidate variants (single nucleotide polymorphisms (SNPs) and insertions and deletions (INDELs)) were identified within those genes. In the long-term, the results obtained here may help to reduce the frequency of subfertility in beef herds, reducing the associated economic losses caused by this condition.
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Affiliation(s)
- Pablo A. S. Fonseca
- Correspondence: (P.A.S.F.); (A.C.); Tel.: +1-519-824-4120 (ext. 56295) (A.C.)
| | | | - Angela Cánovas
- Correspondence: (P.A.S.F.); (A.C.); Tel.: +1-519-824-4120 (ext. 56295) (A.C.)
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24
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Xiao Z, Wang J, Chen S, Feng Y. Autophagy promotion enhances the protective effect of Morroniside on human OA chondrocyte. Biosci Biotechnol Biochem 2020; 84:989-996. [PMID: 31983285 DOI: 10.1080/09168451.2020.1717925] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Accepted: 01/07/2020] [Indexed: 02/06/2023]
Abstract
Morroniside plays a therapeutic role in knee osteoarthritis (OA) by protecting chondrocytes. PI3K/AKT signaling is involved in the regulation of chondrocytes by Morroniside. PI3K/AKT suppresses autophagy through downstream signaling. However, the regulation of chondrocyte autophagy by Morroniside and the significance of the above effect on protecting chondrocytes aren't clear. The results showed that Morroniside inhibited the autophagiy of human OA chondrocytes. Besides, both PI3K inhibitors and mTOR inhibitors significantly reversed the autophagy reduced by Morroniside, but had no effect on the protective effect of Morroniside on chondrocytes. However, the enhanced autophagy caused by overexpression of autophagic genes enhanced the protective effect of Morroniside on chondrocytes. In conclusion, Morroniside represses the autophagy of human OA chondrocyte, which is related to PI3K/mTOR pathway. Moreover, the upregulation of autophagy further promoted the role of Morroniside in treating chondrocytes. Our data present a potential clue for the therapeutic strategies of Morroniside in treating OA.
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Affiliation(s)
- Zhanhao Xiao
- Department of Orthopedics, Fuzhou Second Hospital Affiliated Xiamen University Fuzhou, Fuzhou, Fujian, China
| | - Jiankun Wang
- Department of Orthopedics, Fuzhou Second Hospital Affiliated Xiamen University Fuzhou, Fuzhou, Fujian, China
| | - Sunyu Chen
- Department of Orthopedics, Fuzhou Second Hospital Affiliated Xiamen University Fuzhou, Fuzhou, Fujian, China
| | - Yang Feng
- Department of Orthopedics, Fuzhou Second Hospital Affiliated Xiamen University Fuzhou, Fuzhou, Fujian, China
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Pathomechanisms of Posttraumatic Osteoarthritis: Chondrocyte Behavior and Fate in a Precarious Environment. Int J Mol Sci 2020; 21:ijms21051560. [PMID: 32106481 PMCID: PMC7084733 DOI: 10.3390/ijms21051560] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 02/18/2020] [Accepted: 02/21/2020] [Indexed: 02/07/2023] Open
Abstract
Traumatic injuries of the knee joint result in a wide variety of pathomechanisms, which contribute to the development of so-called posttraumatic osteoarthritis (PTOA). These pathogenetic processes include oxidative stress, excessive expression of catabolic enzymes, release of damage-associated molecular patterns (DAMPs), and synovial inflammation. The present review focuses on the underlying pathomechanisms of PTOA and in particular the behavior and fate of the surviving chondrocytes, comprising chondrocyte metabolism, regulated cell death, and phenotypical changes comprising hypertrophy and senescence. Moreover, possible therapeutic strategies, such as chondroanabolic stimulation, anti-oxidative and anti-inflammatory treatment, as well as novel therapeutic targets are discussed.
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Mackie EJ. Growth Plate Borderline Chondrocytes: A New Source of Metaphyseal Mesenchymal Precursors. J Bone Miner Res 2019; 34:1385-1386. [PMID: 31329317 DOI: 10.1002/jbmr.3758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Eleanor J Mackie
- Department of Veterinary Biosciences, Melbourne Veterinary School, University of Melbourne, Parkville, Victoria, Australia
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27
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Sheehy E, Kelly D, O'Brien F. Biomaterial-based endochondral bone regeneration: a shift from traditional tissue engineering paradigms to developmentally inspired strategies. Mater Today Bio 2019; 3:100009. [PMID: 32159148 PMCID: PMC7061547 DOI: 10.1016/j.mtbio.2019.100009] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 05/23/2019] [Accepted: 05/24/2019] [Indexed: 02/06/2023] Open
Abstract
There is an urgent, clinical need for an alternative to the use of autologous grafts for the ever increasing number of bone grafting procedures performed annually. Herein, we describe a developmentally inspired approach to bone tissue engineering, which focuses on leveraging biomaterials as platforms for recapitulating the process of endochondral ossification. To begin, we describe the traditional biomaterial-based approaches to tissue engineering that have been investigated as methods to promote in vivo bone regeneration, including the use of three-dimensional biomimetic scaffolds, the delivery of growth factors and recombinant proteins, and the in vitro engineering of mineralized bone-like tissue. Thereafter, we suggest that some of the hurdles encountered by these traditional tissue engineering approaches may be circumvented by modulating the endochondral route to bone repair and, to that end, we assess various biomaterials that can be used in combination with cells and signaling factors to engineer hypertrophic cartilaginous grafts capable of promoting endochondral bone formation. Finally, we examine the emerging trends in biomaterial-based approaches to endochondral bone regeneration, such as the engineering of anatomically shaped templates for bone and osteochondral tissue engineering, the fabrication of mechanically reinforced constructs using emerging three-dimensional bioprinting techniques, and the generation of gene-activated scaffolds, which may accelerate the field towards its ultimate goal of clinically successful bone organ regeneration.
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Affiliation(s)
- E.J. Sheehy
- Tissue Engineering Research Group (TERG), Department of Anatomy and Regenerative Medicine, Royal College of Surgeons in Ireland, Dublin, Ireland
- Trinity Centre for Biomedical Engineering, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
- Advanced Materials and Bioengineering Research Centre (AMBER), Royal College of Surgeons in Ireland and Trinity College Dublin, Dublin, Ireland
| | - D.J. Kelly
- Tissue Engineering Research Group (TERG), Department of Anatomy and Regenerative Medicine, Royal College of Surgeons in Ireland, Dublin, Ireland
- Trinity Centre for Biomedical Engineering, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
- Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Dublin, Ireland
- Advanced Materials and Bioengineering Research Centre (AMBER), Royal College of Surgeons in Ireland and Trinity College Dublin, Dublin, Ireland
| | - F.J. O'Brien
- Tissue Engineering Research Group (TERG), Department of Anatomy and Regenerative Medicine, Royal College of Surgeons in Ireland, Dublin, Ireland
- Trinity Centre for Biomedical Engineering, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
- Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Dublin, Ireland
- Advanced Materials and Bioengineering Research Centre (AMBER), Royal College of Surgeons in Ireland and Trinity College Dublin, Dublin, Ireland
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28
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Abubakar AA, Ibrahim SM, Ali AK, Handool KO, Khan MS, Noordin Mustapha M, Azmi Ibrahim T, Kaka U, Mohamad Yusof L. Postnatal ex vivo rat model for longitudinal bone growth investigations. Animal Model Exp Med 2019; 2:34-43. [PMID: 31016285 PMCID: PMC6431117 DOI: 10.1002/ame2.12051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Revised: 11/20/2018] [Accepted: 12/05/2018] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Chondrocytes in the growth plate (GP) undergo increases in volume during different cascades of cell differentiation during longitudinal bone growth. The volume increase is reported to be the most significant variable in understanding the mechanism of long bone growth. METHODS Forty-five postnatal Sprague-Dawley rat pups, 7-15 days old were divided into nine age groups (P7-P15). Five pups were allocated to each group. The rats were sacrificed and tibia and metatarsal bones were harvested. Bone lengths were measured after 0, 24, 48, and 72 hours of ex vivo incubation. Histology of bones was carried out, and GP lengths and chondrocyte densities were determined. RESULTS There were significant differences in bone length among the age groups after 0 and 72 hours of incubation. Histological sectioning was possible in metatarsal bone from all age groups, and in tibia from 7- to 13-day-old rats. No significant differences in tibia and metatarsal GP lengths were seen among different age groups at 0 and 72 hours of incubation. Significant differences in chondrocyte densities along the epiphyseal GP of the bones between 0 and 72 hours of incubation were observed in most of the age groups. CONCLUSION Ex vivo growth of tibia and metatarsal bones of rats aged 7-15 days old is possible, with percentage growth rates of 23.87 ± 0.80% and 40.38 ± 0.95% measured in tibia and metatarsal bone, respectively. Histological sectioning of bones was carried out without the need for decalcification in P7-P13 tibia and P7-P15 metatarsal bone. Increases in chondrocyte density along the GP influence overall bone elongation.
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Affiliation(s)
- Adamu Abdul Abubakar
- Department of Companion Animal Medicine and SurgeryUniversiti Putra MalaysiaSerdangMalaysia
- Department of Veterinary Surgery and RadiologyUsmanu Danfodiyo UniversitySokotoNigeria
| | - Sahar Mohammed Ibrahim
- Department of Companion Animal Medicine and SurgeryUniversiti Putra MalaysiaSerdangMalaysia
- Department of Surgery and TheriogenologyCollege of Veterinary MedicineUniversity of MosulMosulIraq
| | - Ahmed Khalaf Ali
- Department of Companion Animal Medicine and SurgeryUniversiti Putra MalaysiaSerdangMalaysia
- Department of Surgery and TheriogenologyCollege of Veterinary MedicineUniversity of MosulMosulIraq
| | - Kareem Obayes Handool
- Department of Companion Animal Medicine and SurgeryUniversiti Putra MalaysiaSerdangMalaysia
| | - Mohammad Shuaib Khan
- Department of Companion Animal Medicine and SurgeryUniversiti Putra MalaysiaSerdangMalaysia
- Faculty of Veterinary and Animal ScienceGomal UniversityDera Ismail KhanPakistan
| | | | - Tengku Azmi Ibrahim
- Department of Pre‐Clinical Veterinary SciencesUniversiti Putra MalaysiaSerdangMalaysia
| | - Ubedullah Kaka
- Laboratory of Sustainable Animal Production and BiodiversityInstitute of Tropical Agriculture and Food SecurityUniversiti Putra MalaysiaSerdangMalaysia
| | - Loqman Mohamad Yusof
- Department of Companion Animal Medicine and SurgeryUniversiti Putra MalaysiaSerdangMalaysia
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29
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Allas L, Boumédiene K, Baugé C. Epigenetic dynamic during endochondral ossification and articular cartilage development. Bone 2019; 120:523-532. [PMID: 30296494 DOI: 10.1016/j.bone.2018.10.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 10/03/2018] [Accepted: 10/04/2018] [Indexed: 12/23/2022]
Abstract
Within the last decade epigenetics has emerged as fundamental regulator of numerous cellular processes, including those orchestrating embryonic and fetal development. As such, epigenetic factors play especially crucial roles in endochondral ossification, the process by which bone tissue is created, as well during articular cartilage formation. In this review, we summarize the recent discoveries that characterize how DNA methylation, histone post-translational modifications and non-coding RNA (e.g., miRNA and lcnRNA) epigenetically regulate endochondral ossification and chondrogenesis.
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Affiliation(s)
- Lyess Allas
- Normandie Univ, UNICAEN, EA7451 BioConnecT, Caen, France
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30
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Trachana V, Mourmoura E, Papathanasiou I, Tsezou A. Understanding the role of chondrocytes in osteoarthritis: utilizing proteomics. Expert Rev Proteomics 2019; 16:201-213. [DOI: 10.1080/14789450.2019.1571918] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Varvara Trachana
- Laboratory of Biology, Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - Evanthia Mourmoura
- Laboratory of Cytogenetics and Molecular Genetics, Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - Ioanna Papathanasiou
- Laboratory of Cytogenetics and Molecular Genetics, Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - Aspasia Tsezou
- Laboratory of Biology, Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
- Laboratory of Cytogenetics and Molecular Genetics, Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
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31
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Longoni A, Knežević L, Schepers K, Weinans H, Rosenberg AJWP, Gawlitta D. The impact of immune response on endochondral bone regeneration. NPJ Regen Med 2018; 3:22. [PMID: 30510772 PMCID: PMC6265275 DOI: 10.1038/s41536-018-0060-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 10/26/2018] [Indexed: 12/29/2022] Open
Abstract
Tissue engineered cartilage substitutes, which induce the process of endochondral ossification, represent a regenerative strategy for bone defect healing. Such constructs typically consist of multipotent mesenchymal stromal cells (MSCs) forming a cartilage template in vitro, which can be implanted to stimulate bone formation in vivo. The use of MSCs of allogeneic origin could potentially improve the clinical utility of the tissue engineered cartilage constructs in three ways. First, ready-to-use construct availability can speed up the treatment process. Second, MSCs derived and expanded from a single donor could be applied to treat several patients and thus the costs of the medical interventions would decrease. Finally, it would allow more control over the quality of the MSC chondrogenic differentiation. However, even though the envisaged clinical use of allogeneic cell sources for bone regeneration is advantageous, their immunogenicity poses a significant obstacle to their clinical application. The aim of this review is to increase the awareness of the role played by immune cells during endochondral ossification, and in particular during regenerative strategies when the immune response is altered by the presence of implanted biomaterials and/or cells. More specifically, we focus on how this balance between immune response and bone regeneration is affected by the implantation of a cartilaginous tissue engineered construct of allogeneic origin.
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Affiliation(s)
- A Longoni
- 1Department of Oral and Maxillofacial Surgery & Special Dental Care, University Medical Center Utrecht, Utrecht University, Utrecht, G05.222, PO Box 85500, 3508 GA The Netherlands.,Regenerative Medicine Center Utrecht, 3584 CT Utrecht, The Netherlands
| | - L Knežević
- 1Department of Oral and Maxillofacial Surgery & Special Dental Care, University Medical Center Utrecht, Utrecht University, Utrecht, G05.222, PO Box 85500, 3508 GA The Netherlands.,3Faculty of Health Sciences, University of Bristol, Biomedical Sciences Building, Bristol, BS8 1TD UK
| | - K Schepers
- 4Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, 2300RC Leiden, The Netherlands
| | - H Weinans
- 5Department of Orthopaedics, University Medical Center Utrecht, Utrecht University, 3508 GA Utrecht, The Netherlands.,6Department of Rheumatology, University Medical Center Utrecht, Utrecht University, 3584CX Utrecht, The Netherlands.,7Department of Biomechanical Engineering, Delft University of Technology, 2628CD Delft, The Netherlands
| | - A J W P Rosenberg
- 1Department of Oral and Maxillofacial Surgery & Special Dental Care, University Medical Center Utrecht, Utrecht University, Utrecht, G05.222, PO Box 85500, 3508 GA The Netherlands
| | - D Gawlitta
- 1Department of Oral and Maxillofacial Surgery & Special Dental Care, University Medical Center Utrecht, Utrecht University, Utrecht, G05.222, PO Box 85500, 3508 GA The Netherlands.,Regenerative Medicine Center Utrecht, 3584 CT Utrecht, The Netherlands
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32
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Lenas P. The Thermodynamics of Development in Bioartificial Tissue Design. Trends Biotechnol 2018; 36:1116-1126. [PMID: 30297153 DOI: 10.1016/j.tibtech.2018.06.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 06/13/2018] [Accepted: 06/18/2018] [Indexed: 12/30/2022]
Abstract
The fabrication of bioartificial tissues with authentic structures that could assure their clinical efficacy remains a challenging problem. A new paradigm has emerged that designs bioartificial tissues as intermediate in development tissue forms, which can inherently progress autonomously on developmental pathways, self-organizing their cells into tissue structures as in their in vivo development. Biological processes involved in energy exchange between co-developing tissues are responsible for cell organization into the thermodynamically robust cellular patterns of tissue structures. Bioartificial tissue design rules that aim towards in vitro recapitulation of these processes can ensure the thermodynamic operation of developing tissues, leading to formation of the cellular patterns of tissue structures.
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Affiliation(s)
- Petros Lenas
- College of Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China.
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33
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Abstract
PURPOSE OF REVIEW The identity and functional roles of stem cell population(s) that contribute to fracture repair remains unclear. This review provides a brief history of mesenchymal stem cell (MSCs) and provides an updated view of the many stem/progenitor cell populations contributing to fracture repair. RECENT FINDINGS Functional studies show MSCs are not the multipotential stem cell population that form cartilage and bone during fracture repair. Rather, multiple studies have confirmed the periosteum is the primary source of stem/progenitor cells for fracture repair. Newer work is also identifying other stem/progenitor cells that may also contribute to healing. Although the heterogenous periosteal cells migrate to the fracture site and contribute directly to callus formation, other cell populations are involved. Pericytes and bone marrow stromal cells are now thought of as key secretory centers that mostly coordinate the repair process. Other populations of stem/progenitor cells from the muscle and transdifferentiated chondroctyes may also contribute to repair, and their functional role is an area of active research.
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Affiliation(s)
- Beth C Bragdon
- Department of Orthopaedic Surgery, Boston University School of Medicine, 72 East Concord St, Evans 243, Boston, MA, 02118, USA.
| | - Chelsea S Bahney
- Orthopaedic Trauma Institute, Department of Orthopaedic Surgery, University of California, San Francisco (UCSF), San Francisco, CA, USA
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34
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The art of building bone: emerging role of chondrocyte-to-osteoblast transdifferentiation in endochondral ossification. Bone Res 2018. [PMID: 29928541 DOI: 10.1038/s41413‐018‐0021‐z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
There is a worldwide epidemic of skeletal diseases causing not only a public health issue but also accounting for a sizable portion of healthcare expenditures. The vertebrate skeleton is known to be formed by mesenchymal cells condensing into tissue elements (patterning phase) followed by their differentiation into cartilage (chondrocytes) or bone (osteoblasts) cells within the condensations. During the growth and remodeling phase, bone is formed directly via intramembranous ossification or through a cartilage to bone conversion via endochondral ossification routes. The canonical pathway of the endochondral bone formation process involves apoptosis of hypertrophic chondrocytes followed by vascular invasion that brings in osteoclast precursors to remove cartilage and osteoblast precursors to form bone. However, there is now an emerging role for chondrocyte-to-osteoblast transdifferentiation in the endochondral ossification process. Although the concept of "transdifferentiation" per se is not recent, new data using a variety of techniques to follow the fate of chondrocytes in different bones during embryonic and post-natal growth as well as during fracture repair in adults have identified three different models for chondrocyte-to-osteoblast transdifferentiation (direct transdifferentiation, dedifferentiation to redifferentiation, and chondrocyte to osteogenic precursor). This review focuses on the emerging models of chondrocyte-to-osteoblast transdifferentiation and their implications for the treatment of skeletal diseases as well as the possible signaling pathways that contribute to chondrocyte-to-osteoblast transdifferentiation processes.
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35
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Aghajanian P, Mohan S. The art of building bone: emerging role of chondrocyte-to-osteoblast transdifferentiation in endochondral ossification. Bone Res 2018; 6:19. [PMID: 29928541 PMCID: PMC6002476 DOI: 10.1038/s41413-018-0021-z] [Citation(s) in RCA: 147] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 04/26/2018] [Accepted: 05/02/2018] [Indexed: 12/21/2022] Open
Abstract
There is a worldwide epidemic of skeletal diseases causing not only a public health issue but also accounting for a sizable portion of healthcare expenditures. The vertebrate skeleton is known to be formed by mesenchymal cells condensing into tissue elements (patterning phase) followed by their differentiation into cartilage (chondrocytes) or bone (osteoblasts) cells within the condensations. During the growth and remodeling phase, bone is formed directly via intramembranous ossification or through a cartilage to bone conversion via endochondral ossification routes. The canonical pathway of the endochondral bone formation process involves apoptosis of hypertrophic chondrocytes followed by vascular invasion that brings in osteoclast precursors to remove cartilage and osteoblast precursors to form bone. However, there is now an emerging role for chondrocyte-to-osteoblast transdifferentiation in the endochondral ossification process. Although the concept of "transdifferentiation" per se is not recent, new data using a variety of techniques to follow the fate of chondrocytes in different bones during embryonic and post-natal growth as well as during fracture repair in adults have identified three different models for chondrocyte-to-osteoblast transdifferentiation (direct transdifferentiation, dedifferentiation to redifferentiation, and chondrocyte to osteogenic precursor). This review focuses on the emerging models of chondrocyte-to-osteoblast transdifferentiation and their implications for the treatment of skeletal diseases as well as the possible signaling pathways that contribute to chondrocyte-to-osteoblast transdifferentiation processes.
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Affiliation(s)
- Patrick Aghajanian
- Musculoskeletal Disease Center, Veterans Affairs Loma Linda Healthcare System, Loma Linda, California USA
| | - Subburaman Mohan
- Musculoskeletal Disease Center, Veterans Affairs Loma Linda Healthcare System, Loma Linda, California USA
- Department of Medicine, Loma Linda University, Loma Linda, California USA
- Department of Orthopedics, Loma Linda University, Loma Linda, California USA
- Department of Biochemistry, Loma Linda University, Loma Linda, California USA
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36
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Javaheri B, Caetano-Silva SP, Kanakis I, Bou-Gharios G, Pitsillides AA. The Chondro-Osseous Continuum: Is It Possible to Unlock the Potential Assigned Within? Front Bioeng Biotechnol 2018; 6:28. [PMID: 29619368 PMCID: PMC5871702 DOI: 10.3389/fbioe.2018.00028] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 03/08/2018] [Indexed: 01/08/2023] Open
Abstract
Endochondral ossification (EO), by which long bones of the axial skeleton form, is a tightly regulated process involving chondrocyte maturation with successive stages of proliferation, maturation, and hypertrophy, accompanied by cartilage matrix synthesis, calcification, and angiogenesis, followed by osteoblast-mediated ossification. This developmental sequence reappears during fracture repair and in osteoarthritic etiopathology. These similarities suggest that EO, and the cells involved, are of great clinical importance for bone regeneration as it could provide novel targeted approaches to increase specific signaling to promote fracture healing, and if regulated appropriately in the treatment of osteoarthritis. The long-held accepted dogma states that hypertrophic chondrocytes are terminally differentiated and will eventually undergo apoptosis. In this mini review, we will explore recent evidence from experiments that revisit the idea that hypertrophic chondrocytes have pluripotent capacity and may instead transdifferentiate into a specific sub-population of osteoblast cells. There are multiple lines of evidence, including our own, showing that local, selective alterations in cartilage extracellular matrix (ECM) remodeling also indelibly alter bone quality. This would be consistent with the hypothesis that osteoblast behavior in long bones is regulated by a combination of their lineage origins and the epigenetic effects of chondrocyte-derived ECM which they encounter during their recruitment. Further exploration of these processes could help to unlock potential novel targets for bone repair and regeneration and in the treatment of osteoarthritis.
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Affiliation(s)
- Behzad Javaheri
- Skeletal Biology Group, Comparative Biomedical Sciences, The Royal Veterinary College, London, United Kingdom
| | - Soraia P Caetano-Silva
- Skeletal Biology Group, Comparative Biomedical Sciences, The Royal Veterinary College, London, United Kingdom
| | - Ioannis Kanakis
- Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool, United Kingdom
| | - George Bou-Gharios
- Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool, United Kingdom
| | - Andrew A Pitsillides
- Skeletal Biology Group, Comparative Biomedical Sciences, The Royal Veterinary College, London, United Kingdom
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Kennedy RC, Marmor M, Marcucio R, Hunt CA. Simulation enabled search for explanatory mechanisms of the fracture healing process. PLoS Comput Biol 2018; 14:e1005980. [PMID: 29394245 PMCID: PMC5812655 DOI: 10.1371/journal.pcbi.1005980] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2017] [Revised: 02/14/2018] [Accepted: 01/11/2018] [Indexed: 12/25/2022] Open
Abstract
A significant portion of bone fractures fail to heal properly, increasing healthcare costs. Advances in fracture management have slowed because translation barriers have limited generation of mechanism-based explanations for the healing process. When uncertainties are numerous, analogical modeling can be an effective strategy for developing plausible explanations of complex phenomena. We demonstrate the feasibility of engineering analogical models in software to facilitate discovery of biomimetic explanations for how fracture healing may progress. Concrete analogical models—Callus Analogs—were created using the MASON simulation toolkit. We designated a Target Region initial state within a characteristic tissue section of mouse tibia fracture at day-7 and posited a corresponding day-10 Target Region final state. The goal was to discover a coarse-grain analog mechanism that would enable the discretized initial state to transform itself into the corresponding Target Region final state, thereby providing an alternative way to study the healing process. One of nine quasi-autonomous Tissue Unit types is assigned to each grid space, which maps to an 80×80 μm region of the tissue section. All Tissue Units have an opportunity each time step to act based on individualized logic, probabilities, and information about adjacent neighbors. Action causes transition from one Tissue Unit type to another, and simulation through several thousand time steps generates a coarse-grain analog—a theory—of the healing process. We prespecified a minimum measure of success: simulated and actual Target Region states achieve ≥ 70% Similarity. We used an iterative refinement protocol to explore many combinations of Tissue Unit logic and action constraints. Workflows progressed through four stages of analog mechanisms. Similarities of 73–90% were achieved for Mechanisms 2–4. The range of Upper-Level similarities increased to 83–94% when we allowed for uncertainty about two Tissue Unit designations. We have demonstrated how Callus Analog experiments provide domain experts with a fresh medium and tools for thinking about and understanding the fracture healing process. Translation barriers have limited the generation of mechanism-based explanations of fracture healing processes. Those barriers help explain why, to date, biological therapeutics have had only a minor impact on fracture management. Alternative approaches are needed, and we present one that is intended to help develop incrementally better mechanism-based explanations of fracture healing phenomena. We created virtual Callus Analogs to simulate how the histologic appearance of a mouse fracture callus may transition from day-7 to day-10. Callus Analogs use software-based model mechanisms, and simulation experiments enable challenging and improving those model mechanisms. During execution, model mechanism operation provides a coarse-grain explanation (a theory) of a four-day portion of the healing process. Simulated day-10 callus histologic images achieved 73–94% Similarity to a corresponding day-10 fracture callus image, thus demonstrating feasibility. Simulated healing provides an alternative perspective on the actual healing process and an alternative way of thinking about plausible fracture healing mechanisms. Our working hypothesis is that the approach can be extended to cover more of the healing process while making features of simulated and actual fracture healing increasingly analogous. The methods presented are intended to be extensible to other research areas that use histologic analysis to investigate and explain tissue level phenomena.
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Affiliation(s)
- Ryan C. Kennedy
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, California, United States of America
| | - Meir Marmor
- Department of Orthopaedic Surgery, San Francisco General Hospital Orthopaedic Trauma Institute, University of California, San Francisco, California, United States of America
| | - Ralph Marcucio
- Department of Orthopaedic Surgery, San Francisco General Hospital Orthopaedic Trauma Institute, University of California, San Francisco, California, United States of America
| | - C. Anthony Hunt
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, California, United States of America
- * E-mail:
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38
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Bonyadi Rad E, Musumeci G, Pichler K, Heidary M, Szychlinska MA, Castrogiovanni P, Marth E, Böhm C, Srinivasaiah S, Krönke G, Weinberg A, Schäfer U. Runx2 mediated Induction of Novel Targets ST2 and Runx3 Leads to Cooperative Regulation of Hypertrophic Differentiation in ATDC5 Chondrocytes. Sci Rep 2017; 7:17947. [PMID: 29263341 PMCID: PMC5738421 DOI: 10.1038/s41598-017-18044-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 12/04/2017] [Indexed: 11/17/2022] Open
Abstract
Knowledge concerning expression and function of Suppression of Tumorigenicity 2 (ST2) in chondrocytes is at present, limited. Analysis of murine growth plates and ATDC5 chondrocytes indicated peak expression of the ST2 transmembrane receptor (ST2L) and soluble (sST2) isoforms during the hypertrophic differentiation concomitant with the expression of the hypertrophic markers Collagen X (Col X), Runx2 and MMP-13. Gain- and loss-of-function experiments in ATDC5 and primary human growth plate chondrocytes (PHCs), confirmed regulation of ST2 by the key transcription factor Runx2, indicating ST2 to be a novel Runx2 target. ST2 knock-out mice (ST2−/−) exhibited noticeable hypertrophic zone (HZ) reduction in murine growth plates, accompanied by lower expression of Col X and Osteocalcin (OSC) compared to wild-type (WT) mice. Likewise, ST2 knockdown resulted in decreased Col X expression and downregulation of OSC and Vascular Endothelial Growth Factor (VEGF) in ATDC5 cells. The ST2 suppression was also associated with upregulation of the proliferative stage markers Sox9 and Collagen II (Col II), indicating ST2 to be a new regulator of ATDC5 chondrocyte differentiation. Runx3 was, furthermore, identified as a novel Runx2 target in chondrocytes. This study suggests that Runx2 mediates ST2 and Runx3 induction to cooperatively regulate hypertrophic differentiation of ATDC5 chondrocytes.
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Affiliation(s)
- Ehsan Bonyadi Rad
- Department of Orthopedics and Trauma Surgery, Medical University Graz, Graz, Austria.
| | - Giuseppe Musumeci
- Department of Biomedical and Biotechnological Sciences, Human Anatomy and Histology Section, School of Medicine, University of Catania, Catania, Italy
| | - Karin Pichler
- Department of Children and Adolescent Medicine, Pediatrics I, Medical University of Innsbruck, Innsbruck, Austria.,Division of Neonatology, Pediatric Intensive Care and Neuropediatrics, Department of Pediatrics, Medical University of Vienna, Vienna, Austria
| | - Maryam Heidary
- Translational Research Department, Institute Curie, Paris, France
| | - Marta Anna Szychlinska
- Department of Biomedical and Biotechnological Sciences, Human Anatomy and Histology Section, School of Medicine, University of Catania, Catania, Italy
| | - Paola Castrogiovanni
- Department of Biomedical and Biotechnological Sciences, Human Anatomy and Histology Section, School of Medicine, University of Catania, Catania, Italy
| | - Egon Marth
- Institute of Hygiene, Microbiology and Environmental Medicine, Medical University Graz, Graz, Austria
| | - Christina Böhm
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3 - Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
| | - Sriveena Srinivasaiah
- Department of Orthopedics and Trauma Surgery, Medical University Graz, Graz, Austria
| | - Gerhard Krönke
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3 - Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
| | - Annelie Weinberg
- Department of Orthopedics and Trauma Surgery, Medical University Graz, Graz, Austria
| | - Ute Schäfer
- Department of Neurosurgery, Medical University Graz, Graz, Austria
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39
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Wang L, Huang J, Moore DC, Zuo C, Wu Q, Xie L, von der Mark K, Yuan X, Chen D, Warman ML, Ehrlich MG, Yang W. SHP2 Regulates the Osteogenic Fate of Growth Plate Hypertrophic Chondrocytes. Sci Rep 2017; 7:12699. [PMID: 28983104 PMCID: PMC5629218 DOI: 10.1038/s41598-017-12767-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 09/14/2017] [Indexed: 02/07/2023] Open
Abstract
Transdifferentiation of hypertrophic chondrocytes into bone-forming osteoblasts has been reported, yet the underlying molecular mechanism remains incompletely understood. SHP2 is an ubiquitously expressed cytoplasmic protein tyrosine phosphatase. SHP2 loss-of-function mutations in chondroid cells are linked to metachondromatosis in humans and mice, suggesting a crucial role for SHP2 in the skeleton. However, the specific role of SHP2 in skeletal cells has not been elucidated. To approach this question, we ablated SHP2 in collagen 2α1(Col2α1)-Cre- and collagen 10α1(Col10α1)-Cre-expressing cells, predominantly proliferating and hypertrophic chondrocytes, using "Cre-loxP"-mediated gene excision. Mice lacking SHP2 in Col2α1-Cre-expressing cells die at mid-gestation. Postnatal SHP2 ablation in the same cell population caused dwarfism, chondrodysplasia and exostoses. In contrast, mice in which SHP2 was ablated in the Col10α1-Cre-expressing cells appeared normal but were osteopenic. Further mechanistic studies revealed that SHP2 exerted its influence partly by regulating the abundance of SOX9 in chondrocytes. Elevated and sustained SOX9 in SHP2-deficient hypertrophic chondrocytes impaired their differentiation to osteoblasts and impaired endochondral ossification. Our study uncovered an important role of SHP2 in bone development and cartilage homeostasis by influencing the osteogenic differentiation of hypertrophic chondrocytes and provided insight into the pathogenesis and potential treatment of skeletal diseases, such as osteopenia and osteoporosis.
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Affiliation(s)
- Lijun Wang
- Department of Orthopaedic Surgery, Brown University Alpert Medical School, Providence, RI, 02903, USA
| | - Jiahui Huang
- Department of Orthopaedic Surgery, Brown University Alpert Medical School, Providence, RI, 02903, USA
| | - Douglas C Moore
- Department of Orthopaedic Surgery, Brown University Alpert Medical School, Providence, RI, 02903, USA
| | - Chunlin Zuo
- Department of Orthopaedic Surgery, Brown University Alpert Medical School, Providence, RI, 02903, USA
- Department of Endocrinology, the First Affiliated Hospital of Anhui Medical University, Hefei, 230022, P.R. China
| | - Qian Wu
- Department of Pathology and Laboratory Medicine, University of Connecticut Health Center, Farmington, CT, 06030, USA
| | - Liqin Xie
- Regeneron Pharmaceuticals, Tarrytown, NY, 10591, USA
| | - Klaus von der Mark
- Department of Experimental Medicine, University of Erlangen-Nürnberg, Gluckstrasse 6, 91054, Erlangen, Germany
| | - Xin Yuan
- Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, 02115, USA
| | - Di Chen
- Department of Biochemistry, Rush University, 600 S. Paulina St., Chicago, IL, 60612, USA
| | - Matthew L Warman
- Orthopaedic Research Laboratories and Howard Hughes Medical Institute, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Michael G Ehrlich
- Department of Orthopaedic Surgery, Brown University Alpert Medical School, Providence, RI, 02903, USA
| | - Wentian Yang
- Department of Orthopaedic Surgery, Brown University Alpert Medical School, Providence, RI, 02903, USA.
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40
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Suzuki D, Bush JR, Bryce DM, Kamijo R, Beier F. Rac1 Dosage Is Crucial for Normal Endochondral Bone Growth. Endocrinology 2017; 158:3386-3398. [PMID: 28977598 DOI: 10.1210/en.2016-1691] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 07/14/2017] [Indexed: 01/28/2023]
Abstract
Rac1, a member of the small Rho GTPase family, plays multiple cellular roles. Studies of mice conditionally lacking Rac1 have revealed essential roles for Rac1 in various tissues, including cartilage and limb mesenchyme, where Rac1 loss produces dwarfism and long bone shortening. To gain further insight into the role of Rac1 in skeletal development, we have used transgenic mouse lines to express a constitutively active (ca) Rac1 mutant protein in a Cre recombinase-dependent manner. Overexpression of caRac1 in limb bud mesenchyme or chondrocytes leads to reduced body weight and shorter bones compared with control mice. Histological analysis of growth plates showed that caRac1;Col2-Cre mice displayed ectopic hypertrophic chondrocytes in the proliferative zone and enlarged hypertrophic zones. These mice also displayed a reduced proportion of proliferating cell nuclear antigen-positive cells in the proliferative zone and nuclear β-catenin localization in the ectopic hypertrophic chondrocytes. Importantly, overexpression of caRac1 partially rescued the phenotypes of Rac1fl/fl;Col2-Cre and Rac1fl/fl;Prx1-Cre conditional knockout mice, including body weight, bone length, and growth plate disorganization. These results suggest that tight regulation of Rac1 activity is necessary for normal cartilage development.
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Affiliation(s)
- Dai Suzuki
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario N6A 5C1, Canada
- Department of Biochemistry, School of Dentistry, Showa University, Shinagawa, Tokyo 142-8555, Japan
| | - Jason R Bush
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario N6A 5C1, Canada
| | - Dawn-Marie Bryce
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario N6A 5C1, Canada
| | - Ryutaro Kamijo
- Department of Biochemistry, School of Dentistry, Showa University, Shinagawa, Tokyo 142-8555, Japan
| | - Frank Beier
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario N6A 5C1, Canada
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41
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Hu DP, Ferro F, Yang F, Taylor AJ, Chang W, Miclau T, Marcucio RS, Bahney CS. Cartilage to bone transformation during fracture healing is coordinated by the invading vasculature and induction of the core pluripotency genes. Development 2017; 144:221-234. [PMID: 28096214 DOI: 10.1242/dev.130807] [Citation(s) in RCA: 146] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 11/29/2016] [Indexed: 01/01/2023]
Abstract
Fractures heal predominantly through the process of endochondral ossification. The classic model of endochondral ossification holds that chondrocytes mature to hypertrophy, undergo apoptosis and new bone forms by invading osteoprogenitors. However, recent data demonstrate that chondrocytes transdifferentiate to osteoblasts in the growth plate and during regeneration, yet the mechanism(s) regulating this process remain unknown. Here, we show a spatially-dependent phenotypic overlap between hypertrophic chondrocytes and osteoblasts at the chondro-osseous border in the fracture callus, in a region we define as the transition zone (TZ). Hypertrophic chondrocytes in the TZ activate expression of the pluripotency factors [Sox2, Oct4 (Pou5f1), Nanog], and conditional knock-out of Sox2 during fracture healing results in reduction of the fracture callus and a delay in conversion of cartilage to bone. The signal(s) triggering expression of the pluripotency genes are unknown, but we demonstrate that endothelial cell conditioned medium upregulates these genes in ex vivo fracture cultures, supporting histological evidence that transdifferentiation occurs adjacent to the vasculature. Elucidating the cellular and molecular mechanisms underlying fracture repair is important for understanding why some fractures fail to heal and for developing novel therapeutic interventions.
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Affiliation(s)
- Diane P Hu
- University of California, San Francisco (UCSF) & San Francisco General Hospital (SFGH), Department of Orthopaedic Surgery, Orthopaedic Trauma Institute, 2550 23rd Street, Building 9, 3rd Floor, San Francisco, CA 94110, USA
| | - Federico Ferro
- University of California, San Francisco (UCSF) & San Francisco General Hospital (SFGH), Department of Orthopaedic Surgery, Orthopaedic Trauma Institute, 2550 23rd Street, Building 9, 3rd Floor, San Francisco, CA 94110, USA
| | - Frank Yang
- University of California, San Francisco (UCSF) & San Francisco General Hospital (SFGH), Department of Orthopaedic Surgery, Orthopaedic Trauma Institute, 2550 23rd Street, Building 9, 3rd Floor, San Francisco, CA 94110, USA
| | - Aaron J Taylor
- University of California, San Francisco (UCSF) & San Francisco General Hospital (SFGH), Department of Orthopaedic Surgery, Orthopaedic Trauma Institute, 2550 23rd Street, Building 9, 3rd Floor, San Francisco, CA 94110, USA
| | - Wenhan Chang
- University of California, San Francisco (UCSF) & San Francisco Veterans Affairs Medical Center (VAMC), Department of Medicine, 1700 Owens Street, 4th Floor, San Francisco, CA 94158, USA
| | - Theodore Miclau
- University of California, San Francisco (UCSF) & San Francisco General Hospital (SFGH), Department of Orthopaedic Surgery, Orthopaedic Trauma Institute, 2550 23rd Street, Building 9, 3rd Floor, San Francisco, CA 94110, USA
| | - Ralph S Marcucio
- University of California, San Francisco (UCSF) & San Francisco General Hospital (SFGH), Department of Orthopaedic Surgery, Orthopaedic Trauma Institute, 2550 23rd Street, Building 9, 3rd Floor, San Francisco, CA 94110, USA
| | - Chelsea S Bahney
- University of California, San Francisco (UCSF) & San Francisco General Hospital (SFGH), Department of Orthopaedic Surgery, Orthopaedic Trauma Institute, 2550 23rd Street, Building 9, 3rd Floor, San Francisco, CA 94110, USA
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42
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Chondrogenesis and osteogenesis are one continuous developmental and lineage defined biological process. Sci Rep 2017. [PMID: 28855706 DOI: 10.1038/s41598‐017‐10048‐z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Although chondrogenesis and osteogenesis are considered as two separate processes during endochondral bone formation after birth, recent studies have demonstrated the direct cell transformation from chondrocytes into bone cells in postnatal bone growth. Here we use cell lineage tracing and multiple in vivo approaches to study the role of Bmpr1a in endochondrogenesis. Our data showed profound changes in skeletal shape, size and structure when Bmpr1a was deleted using Aggrecan-Cre ERT2 in early cartilage cells with a one-time tamoxifen injection. We observed the absence of lineage progression of chondrocyte-derived bone cells to form osteoblasts and osteocytes in metaphyses. Furthermore, we demonstrated the key contribution of growth plate chondrocytes and articular chondrocytes, not only for long bone growth, but also for bone remodeling. In contrast, deleting Bmpr1a in early osteoblasts with 3.6 Col 1-Cre had little impact on skeletal shape and size except for a sharp increase in osteoblasts and osteocytes, leading to a profound increase in bone volume. We conclude that chondrogenesis and osteogenesis are one continuous developmental and lineage-defined biological process, in which Bmpr1a signaling in chondrocytes is necessary for the formation of a pool or niche of osteoprogenitors that then contributes in a major way to overall bone formation and growth.
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43
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Jing Y, Jing J, Ye L, Liu X, Harris SE, Hinton RJ, Feng JQ. Chondrogenesis and osteogenesis are one continuous developmental and lineage defined biological process. Sci Rep 2017; 7:10020. [PMID: 28855706 PMCID: PMC5577112 DOI: 10.1038/s41598-017-10048-z] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 08/02/2017] [Indexed: 02/05/2023] Open
Abstract
Although chondrogenesis and osteogenesis are considered as two separate processes during endochondral bone formation after birth, recent studies have demonstrated the direct cell transformation from chondrocytes into bone cells in postnatal bone growth. Here we use cell lineage tracing and multiple in vivo approaches to study the role of Bmpr1a in endochondrogenesis. Our data showed profound changes in skeletal shape, size and structure when Bmpr1a was deleted using Aggrecan-CreERT2 in early cartilage cells with a one-time tamoxifen injection. We observed the absence of lineage progression of chondrocyte-derived bone cells to form osteoblasts and osteocytes in metaphyses. Furthermore, we demonstrated the key contribution of growth plate chondrocytes and articular chondrocytes, not only for long bone growth, but also for bone remodeling. In contrast, deleting Bmpr1a in early osteoblasts with 3.6 Col 1-Cre had little impact on skeletal shape and size except for a sharp increase in osteoblasts and osteocytes, leading to a profound increase in bone volume. We conclude that chondrogenesis and osteogenesis are one continuous developmental and lineage-defined biological process, in which Bmpr1a signaling in chondrocytes is necessary for the formation of a pool or niche of osteoprogenitors that then contributes in a major way to overall bone formation and growth.
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Affiliation(s)
- Yan Jing
- Department of Orthodontics, Texas A&M University College of Dentistry, Dallas, TX, 75246, USA.
| | - Junjun Jing
- Department of Biomedical Sciences, Texas A&M University College of Dentistry, Dallas, TX, 75246, USA.,State Key Laboratory of Oral diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China
| | - Ling Ye
- Department of Biomedical Sciences, Texas A&M University College of Dentistry, Dallas, TX, 75246, USA.,Department of Dental Research, Naval Post-Graduate Dental School, Navy Medicine Professional Development Center Walter Reed National Military Medical Center; Postgraduate Dental College Uniformed Services, University of the Health Sciences, 8955 Wood Road Bethesda, MD, 20889, USA
| | - Xiaohua Liu
- Department of Biomedical Sciences, Texas A&M University College of Dentistry, Dallas, TX, 75246, USA
| | - Stephen E Harris
- Department of Periodontics, University of Texas Health Science Center at San Antonio, San Antonio, TX, 78229, USA
| | - Robert J Hinton
- Department of Biomedical Sciences, Texas A&M University College of Dentistry, Dallas, TX, 75246, USA
| | - Jian Q Feng
- Department of Biomedical Sciences, Texas A&M University College of Dentistry, Dallas, TX, 75246, USA.
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44
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Low molecular weight xanthan gum suppresses oxidative stress-induced apoptosis in rabbit chondrocytes. Carbohydr Polym 2017; 169:255-263. [DOI: 10.1016/j.carbpol.2017.04.018] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 04/06/2017] [Accepted: 04/10/2017] [Indexed: 01/07/2023]
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45
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Su YW, Zhou XF, Foster BK, Grills BL, Xu J, Xian CJ. Roles of neurotrophins in skeletal tissue formation and healing. J Cell Physiol 2017; 233:2133-2145. [PMID: 28370021 DOI: 10.1002/jcp.25936] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2017] [Accepted: 03/27/2017] [Indexed: 12/21/2022]
Abstract
Neurotrophins and their receptors are key molecules that are known to be critical in regulating nervous system development and maintenance and have been recognized to be also involved in regulating tissue formation and healing in skeletal tissues. Studies have shown that neurotrophins and their receptors are widely expressed in skeletal tissues, implicated in chondrogenesis, osteoblastogenesis, and osteoclastogenesis, and are also involved in regulating tissue formation and healing events in skeletal tissue. Increased mRNA expression for neurotrophins NGF, BDNF, NT-3, and NT-4, and their Trk receptors has been observed in injured bone tissues, and NT-3 and its receptor, TrkC, have been identified to have the highest induction at the injury site in a drill-hole injury repair model in both bone and the growth plate. In addition, NT-3 has also recently been shown to be both an osteogenic and angiogenic factor, and this neurotrophin can also enhance expression of the key osteogenic factor, BMP-2, as well as the major angiogenic factor, VEGF, to promote bone formation, vascularization, and healing of the injury site. Further studies, however, are needed to investigate if different neurotrophins have differential roles in skeletal repair, and if NT-3 can be a potential target of intervention for promoting bone fracture healing.
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Affiliation(s)
- Yu-Wen Su
- Sansom Institute for Health Research and School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, South Australia, Australia
| | - Xin-Fu Zhou
- Sansom Institute for Health Research and School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, South Australia, Australia
| | - Bruce K Foster
- Department of Orthopaedic Surgery, Women's and Children's Hospital, North Adelaide, South Australia, Australia
| | - Brian L Grills
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Bundoora, Victoria, Australia
| | - Jiake Xu
- School of Biomedical Sciences, University of Western Australia, Nedlands, Western Australia, Australia
| | - Cory J Xian
- Sansom Institute for Health Research and School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, South Australia, Australia
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46
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Taking the endochondral route to craniomaxillofacial bone regeneration: A logical approach? J Craniomaxillofac Surg 2017; 45:1099-1106. [PMID: 28479032 DOI: 10.1016/j.jcms.2017.03.025] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 03/24/2017] [Accepted: 03/30/2017] [Indexed: 01/09/2023] Open
Abstract
The current golden standard for treatment of craniomaxillofacial critical size bone defects, autologous bone grafting, is associated with several disadvantages which have prompted an increased demand for alternatives. New solutions are emerging in the form of bone tissue engineering. This involves harvesting of multipotent mesenchymal stromal cells (MSCs), after which they can be differentiated towards the osteogenic lineage mimicking intramembranous bone formation. However, translating this approach from laboratory to clinic has met with limited success. Consequently, attention has shifted towards investigation of the alternative endochondral route of bone regeneration. At a first glance, this approach may not appear logical for maxillofacial bone regeneration as most bones in the face originate from intramembranous mechanisms. Therefore, the goal of this review is to discuss the sense and non-sense of exploring endochondral bone regeneration as a novel reconstructive option for craniomaxillofacial bone defects. The embryological origin of craniomaxillofacial bone structures and their repair mechanisms are introduced. Also, the potential of MSC-like cells, the neural crest-derived stem cells from craniomaxillofacial sources, are discussed with a focus on regeneration of bone defects. Further, the current status of endochondral bone regeneration from MSCs is highlighted. Together, these aspects contribute in answering whether endochondral bone regeneration can be a logical approach to restore craniomaxillofacial bone defects.
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47
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Jing Y, Hinton RJ, Chan KS, Feng JQ. Co-localization of Cell Lineage Markers and the Tomato Signal. J Vis Exp 2016. [PMID: 28060349 DOI: 10.3791/54982] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
The cell lineage tracing system has been used predominantly in developmental biology studies. The use of Cre recombinase allows for the activation of the reporter in a specific cell line and all progeny. Here, we used the cell lineage tracing technique to demonstrate that chondrocytes directly transform into osteoblasts and osteocytes during long bone and mandibular condyle development using two kinds of Cre, Col10a1-Cre and Aggrecan-CreERT2 (Agg-CreERT2), crossed with Rosa26tdTomato. Both Col10 and aggrecan are well-recognized markers for chondrocytes. On this basis, we developed a new method-cell lineage tracing in conjunction with fluorescent immunohistochemistry-to define cell fate by analyzing the expression of specific cell markers. Runx2 (a marker for early-stage osteogenic cells) and Dentin matrix protein1 (DMP1; a marker for late-stage osteogenic cells) were used to identify chondrocyte-derived bone cells and their differentiation status. This combination not only broadens the application of cell lineage tracing, but also simplifies the generation of compound mice. More importantly, the number, location, and differentiation statuses of parent cell progeny are displayed simultaneously, providing more information than cell lineage tracing alone. In conclusion, the co-application of cell lineage tracing techniques and immunofluorescence is a powerful tool for investigating cell biology in vivo.
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Affiliation(s)
- Yan Jing
- Department of Biomedical Sciences, Texas A&M University College of Dentistry;
| | - Robert J Hinton
- Department of Biomedical Sciences, Texas A&M University College of Dentistry
| | - Kevin S Chan
- Department of Biomedical Sciences, Texas A&M University College of Dentistry
| | - Jian Q Feng
- Department of Biomedical Sciences, Texas A&M University College of Dentistry;
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48
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Houben A, Kostanova-Poliakova D, Weissenböck M, Graf J, Teufel S, von der Mark K, Hartmann C. β-catenin activity in late hypertrophic chondrocytes locally orchestrates osteoblastogenesis and osteoclastogenesis. Development 2016; 143:3826-3838. [PMID: 27621061 PMCID: PMC5087647 DOI: 10.1242/dev.137489] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 08/24/2016] [Indexed: 12/21/2022]
Abstract
Trabecular bone formation is the last step in endochondral ossification. This remodeling process of cartilage into bone involves blood vessel invasion and removal of hypertrophic chondrocytes (HTCs) by chondroclasts and osteoclasts. Periosteal- and chondrocyte-derived osteoprogenitors utilize the leftover mineralized HTC matrix as a scaffold for primary spongiosa formation. Here, we show genetically that β-catenin (encoded by Ctnnb1), a key component of the canonical Wnt pathway, orchestrates this remodeling process at multiple levels. Conditional inactivation or stabilization of β-catenin in HTCs by a Col10a1-Cre line locally modulated osteoclastogenesis by altering the Rankl:Opg ratio in HTCs. Lack of β-catenin resulted in a severe decrease of trabecular bone in the embryonic long bones. Gain of β-catenin activity interfered with removal of late HTCs and bone marrow formation, leading to a continuous mineralized hypertrophic core in the embryo and resulting in an osteopetrotic-like phenotype in adult mice. Furthermore, β-catenin activity in late HTCs is required for chondrocyte-derived osteoblastogenesis at the chondro-osseous junction. The latter contributes to the severe trabecular bone phenotype in mutants lacking β-catenin activity in HTCs. Summary: The conditional modulation of β-catenin activity in late hypertrophic chondrocytes locally regulates osteoclast differentiation and the transdifferentiation of chondrocytes into osteoblasts.
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Affiliation(s)
- Astrid Houben
- Institute of Experimental Musculoskeletal Medicine, Medical Faculty of the University of Münster, Domagkstrasse 3, 48149 Münster, Germany
| | | | - Martina Weissenböck
- Research Institute of Molecular Pathology, Dr. Bohr-Gasse 7, A-1030 Vienna, Austria
| | - Julian Graf
- Institute of Experimental Musculoskeletal Medicine, Medical Faculty of the University of Münster, Domagkstrasse 3, 48149 Münster, Germany
| | - Stefan Teufel
- Institute of Experimental Musculoskeletal Medicine, Medical Faculty of the University of Münster, Domagkstrasse 3, 48149 Münster, Germany
| | - Klaus von der Mark
- Dept. of Experimental Medicine I, University of Erlangen-Nürnberg, Glückstrasse 6, 91054 Erlangen, Germany
| | - Christine Hartmann
- Institute of Experimental Musculoskeletal Medicine, Medical Faculty of the University of Münster, Domagkstrasse 3, 48149 Münster, Germany
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49
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Samsa WE, Zhou X, Zhou G. Signaling pathways regulating cartilage growth plate formation and activity. Semin Cell Dev Biol 2016; 62:3-15. [PMID: 27418125 DOI: 10.1016/j.semcdb.2016.07.008] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 07/08/2016] [Indexed: 12/17/2022]
Abstract
The growth plate is a highly specialized and dynamic cartilage structure that serves many essential functions in skeleton patterning, growth and endochondral ossification in developing vertebrates. Major signaling pathways initiated by classical morphogens and by other systemic and tissue-specific factors are intimately involved in key aspects of growth plate development. As a corollary of these essential functions, disturbances in these pathways due to mutations or environmental factors lead to severe skeleton disorders. Here, we review these pathways and the most recent progress made in understanding their roles in chondrocyte differentiation in growth plate development and activity. Furthermore, we discuss newly uncovered pathways involved in growth plate formation, including mTOR, the circadian clock, and the COP9 signalosome.
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Affiliation(s)
- William E Samsa
- Department of Orthopaedics, Case Western Reserve University, Cleveland, OH, USA
| | - Xin Zhou
- Department of Genetics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Guang Zhou
- Department of Orthopaedics, Case Western Reserve University, Cleveland, OH, USA; Department of Genetics and Genome Sciences, Case Western Reserve University, Cleveland, OH, USA; Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, OH, USA.
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50
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Le HTN, Phi LT, Dao TTT, Phan NK, Van Pham P, Vu NB. A mouse model of osteonecrotic femoral head induced by methylprednisolone and liposaccharide. BIOMEDICAL RESEARCH AND THERAPY 2016. [DOI: 10.7603/s40730-016-0012-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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