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Li T, Liu B, Chen K, Lou Y, Jiang Y, Zhang D. Small molecule compounds promote the proliferation of chondrocytes and chondrogenic differentiation of stem cells in cartilage tissue engineering. Biomed Pharmacother 2020; 131:110652. [PMID: 32942151 DOI: 10.1016/j.biopha.2020.110652] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 08/15/2020] [Accepted: 08/17/2020] [Indexed: 02/09/2023] Open
Abstract
The application of tissue engineering to generate cartilage is limited because of low proliferative ability and unstable phenotype of chondrocytes. The sources of cartilage seed cells are mainly chondrocytes and stem cells. A variety of methods have been used to obtain large numbers of chondrocytes, including increasing chondrocyte proliferation and stem cell chondrogenic differentiation via cytokines, genes, and proteins. Natural or synthetic small molecule compounds can provide a simple and effective method to promote chondrocyte proliferation, maintain a stable chondrocyte phenotype, and promote stem cell chondrogenic differentiation. Therefore, the study of small molecule compounds is of great importance for cartilage tissue engineering. Herein, we review a series of small molecule compounds and their mechanisms that can promote chondrocyte proliferation, maintain chondrocyte phenotype, or induce stem cell chondrogenesis. The studies in this field represent significant contributions to the research in cartilage tissue engineering and regenerative medicine.
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Affiliation(s)
- Tian Li
- Department of Plastic and Reconstructive Surgery, The First Bethune Hospital of Jilin University, Changchun, Jilin, People's Republic of China
| | - Bingzhang Liu
- Department of Plastic and Reconstructive Surgery, The First Bethune Hospital of Jilin University, Changchun, Jilin, People's Republic of China
| | - Kang Chen
- Department of Plastic and Reconstructive Surgery, The First Bethune Hospital of Jilin University, Changchun, Jilin, People's Republic of China
| | - Yingyue Lou
- Department of Plastic and Reconstructive Surgery, The First Bethune Hospital of Jilin University, Changchun, Jilin, People's Republic of China
| | - Yuhan Jiang
- Department of Plastic and Reconstructive Surgery, The First Bethune Hospital of Jilin University, Changchun, Jilin, People's Republic of China
| | - Duo Zhang
- Department of Plastic and Reconstructive Surgery, The First Bethune Hospital of Jilin University, Changchun, Jilin, People's Republic of China.
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Braun S, Weichhardt H, Uhlmann D. Chondroma of the Sternum Growing in a Pregnant Patient: A Case Report. Ann Thorac Cardiovasc Surg 2017; 23:262-264. [PMID: 28592723 DOI: 10.5761/atcs.cr.17-00009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
PURPOSE Benign tumors are known to grow or develop sometimes during pregnancy. We present a case report about a young woman with a growing sternal tumor. METHODS After her second pregnancy, a 32-year-old female presented with a rapid growing sternal tumor. Computed tomography (CT) scan revealed a tumor measuring 10 × 8 × 7 cm with an intrathoracic bulk, compressing the heart and the upper margin of the liver. RESULTS Resection of the tumor was performed uneventfully. Histologic examination of the resected mass revealed a chondroma. CONCLUSION To the best of our knowledge, this is the first report of a huge sternal chondroma growing in a pregnant patient. There is not often a need to treat these patients before delivery, however, thereafter surgical treatment of growing tumors is recommended.
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Affiliation(s)
| | | | - Dirk Uhlmann
- Department of Surgery, Klinikum Döbeln, Döbeln, Germany
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Takahashi T, Ogasawara T, Kishimoto J, Liu G, Asato H, Nakatsuka T, Uchinuma E, Nakamura K, Kawaguchi H, Takato T, Hoshi K. Synergistic Effects of FGF-2 with Insulin or IGF-I on the Proliferation of Human Auricular Chondrocytes. Cell Transplant 2017; 14:683-693. [DOI: 10.3727/000000005783982675] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Chondrocyte preparation with the safety and efficiency is the first step in cartilage regenerative medicine. To prepare a chondrocyte proliferation medium that does not contain fetal bovine serum (FBS) and that provides more than a 1000-fold increase in cell numbers within approximately 1 month, we attempted to use the medium containing 5% human serum (HS), but it exerted no more than twofold increase in 2 weeks. To compensate for the limited proliferation ability in HS, we investigated the combinational effects of 12 factors [i.e., fibroblast growth factor(FGF)-2, insulin-like growth factor(IGF)-I, insulin, bone morphogenetic protein-2, parathyroid hormone, growth hormone, dexamethasone, 1α25-dihydroxy vitamin D3, L-3,3′,5′-triodothyronine, interleukine-1 receptor antagonist, 17β-estradiol, and testosterone] on the proliferation of human auricular chondrocytes by analysis of variance in fractional factorial design. As a result, FGF-2, dexamethasone, insulin, and IGF-I possessed promotional effects on proliferation, while the combination of FGF-2 with insulin or IGF-I synergistically enhanced the proliferation. Actually, the chondrocytes increased 7.5-fold in number in 2 weeks in a medium containing 5% HS with 10 ng/ml FGF-2, while the cell number synergistically gained a 10–12-fold increase with 5 μg/ml insulin or 100 ng/ml IGF-I in the same period. The proliferation effects were more enhanced at a concentration of 100 ng/ml for FGF-2, and especially for the combination of 100 ng/ml FGF-2 and 5 μg/ml insulin (approximately 16-fold within 2 weeks). In the long-term culture with repeated passaging, this combination provided more than 10,000-fold within 8 weeks (i.e., passage 4). Thus, we concluded that such a combination of FGF-2 with insulin or IGF-I may be useful for promotion of auricular chondrocyte proliferation in a clinical application for cartilage regeneration.
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Affiliation(s)
- Tsuguharu Takahashi
- Department of MENICON Cartilage & Bone Regeneration, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7–3–1, Bunkyo-Ku, Tokyo 113–0033, Japan
- Division of Tissue Engineering, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7–3–1, Bunkyo-Ku, Tokyo 113–0033, Japan
| | - Toru Ogasawara
- Department of MENICON Cartilage & Bone Regeneration, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7–3–1, Bunkyo-Ku, Tokyo 113–0033, Japan
- Department of Oral & Maxillofacial Surgery, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7–3–1, Bunkyo-Ku, Tokyo 113–0033, Japan
| | - Junji Kishimoto
- Department of Clinical Bioinformatics, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7–3–1, Bunkyo-Ku, Tokyo 113–0033, Japan
| | - Guangyao Liu
- Department of MENICON Cartilage & Bone Regeneration, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7–3–1, Bunkyo-Ku, Tokyo 113–0033, Japan
- Department of Orthopaedics Surgery, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7–3–1, Bunkyo-Ku, Tokyo 113–0033, Japan
| | - Hirotaka Asato
- Department of Plastic & Reconstructive Surgery, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7–3–1, Bunkyo-Ku, Tokyo 113–0033, Japan
| | - Takashi Nakatsuka
- Department of Plastic & Reconstructive Surgery, Saitama Medical School, Kerohongo 38, keroyama-cho, Iruma, Saitama 350–0495, Japan
| | - Eijyu Uchinuma
- Department of Plastic & Reconstructive Surgery, Kitasato University, Kitasato 1–15–1, Sagamihara, Kanagawa 228–8555, Japan
| | - Kozo Nakamura
- Department of Clinical Bioinformatics, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7–3–1, Bunkyo-Ku, Tokyo 113–0033, Japan
| | - Hiroshi Kawaguchi
- Department of Clinical Bioinformatics, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7–3–1, Bunkyo-Ku, Tokyo 113–0033, Japan
| | - Tsuyoshi Takato
- Division of Tissue Engineering, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7–3–1, Bunkyo-Ku, Tokyo 113–0033, Japan
- Department of Oral & Maxillofacial Surgery, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7–3–1, Bunkyo-Ku, Tokyo 113–0033, Japan
| | - Kazuto Hoshi
- Department of MENICON Cartilage & Bone Regeneration, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7–3–1, Bunkyo-Ku, Tokyo 113–0033, Japan
- Division of Tissue Engineering, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7–3–1, Bunkyo-Ku, Tokyo 113–0033, Japan
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Shi S, Zheng S, Li XF, Liu ZD. The Effect of Estradiol on the Growth Plate Chondrocytes of Limb and Spine from Postnatal Mice in vitro: The Role of Estrogen-Receptor and Estradiol Concentration. Int J Biol Sci 2017; 13:100-109. [PMID: 28123350 PMCID: PMC5264265 DOI: 10.7150/ijbs.17696] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2016] [Accepted: 11/08/2016] [Indexed: 01/04/2023] Open
Abstract
Objectives: Skeletal development is a complex process. Little is known about the different response of limb or spine growth plate chondrocytes (LGP or SGP) to the estrogen level and the role of estrogen receptor (ER) during postnatal stage. Methods: LGP and SGP chondrocytes were isolated from 50 one-week mice and treated with different concentrations of 17β-estradiol. Cell viability was measured by cell counting kit-8 (CCK-8). The expression of collagen II and X were evaluated by real-time PCR and Western blotting. Then, the response of LGP or SGP chondrocyte after with or without estradiol and specific ER antagonists to block the effect of ERs were also measured by Western blotting and immunofluorescence. Results: Estradiol promoted the chondrogensis of the chondrocytes in vitro and achieved the maximal expression of type II collagen at the dose of 10-7 M. Additionally, the regulatory effect of estradiol on the chondrogenesis can be mainly relied on ERα. The LGP chondrocytes were more sensitive to the estradiol treatment than SGP in the expression of type II collagen. Conclusions: Estrogen at a pharmacological concentration (10-7 M) could stimulate the maximal production of type II collagen in the growth plate chondrocytes in vitro, which exerts its activity mainly through ERα in the chondrogenesis. Furthermore, the LGP chondrocytes were more sensitive to the estradiol treatment than SGP in the chondrogenesis.
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Affiliation(s)
- Sheng Shi
- Department of Orthopaedic Surgery, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200127, P.R.China
| | - Shuang Zheng
- Department of Endocrinology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200127, P.R.China
| | - Xin-Feng Li
- Department of Orthopaedic Surgery, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200127, P.R.China
| | - Zu-De Liu
- Department of Orthopaedic Surgery, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200127, P.R.China
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Continuous infusion of angiotensin II modulates hypertrophic differentiation and apoptosis of chondrocytes in cartilage formation in a fracture model mouse. Hypertens Res 2015; 38:382-93. [PMID: 25693858 DOI: 10.1038/hr.2015.18] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 12/08/2014] [Accepted: 12/15/2014] [Indexed: 12/16/2022]
Abstract
Although components of the renin-angiotensin system (RAS) are reported to be expressed in cultured chondrocytes and cartilage, little is known about the precise function of Angiotensin II (Ang II) in chondrocytes. In this study, we employed a rib fracture model mouse to investigate the effect of Ang II on chondrocytes. Ang II type 1 receptor (AT1R) was expressed in chondrocytes in the growth plate of mouse tibia. Continuous infusion of Ang II to rib-fractured mice resulted in a significant increase in the volume of cartilage, suggesting Ang II-induced hypertrophic differentiation of chondrocytes. It was also confirmed by a significant increase in the mRNA expression of Sox9 and runt-related transcription factor 2 (Runx2), which are genes related to chondrocyte differentiation, and type X collagen, matrix metalloproteinase (MMP)-13 and Indian hedgehog (Ihh), which are hypertrophic chondrocyte-specific molecular markers. Chondrocyte hypertrophy with upregulation of these genes was attenuated by administration of olmesartan, an AT1R blocker, but not by hydralazine. Moreover, Ang II infusion significantly suppressed apoptosis of chondrocytes, accompanied by significant induction of mRNA expression of bcl-2 and bcl-xL. Olmesartan, but not hydralazine, significantly attenuated the reduction of apoptotic cells and the increase in anti-apoptotic genes induced by Ang II infusion. Overall, the present study demonstrated that Ang II promoted hypertrophic differentiation of chondrocytes and reduced apoptosis of hypertrophic chondrocytes independently of high blood pressure. The present data indicate the role of Ang II in cartilage, and might provide a new concept for treatment of cartilage diseases.
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Elbaradie KB, Wang Y, Boyan BD, Schwartz Z. Sex-specific response of rat costochondral cartilage growth plate chondrocytes to 17β-estradiol involves differential regulation of plasma membrane associated estrogen receptors. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2013; 1833:1165-72. [DOI: 10.1016/j.bbamcr.2012.12.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Revised: 12/29/2012] [Accepted: 12/30/2012] [Indexed: 12/17/2022]
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7
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Li XF, Wang SJ, Jiang LS, Dai LY. Stage specific effect of leptin on the expressions of estrogen receptor and extracellular matrix in a model of chondrocyte differentiation. Cytokine 2013; 61:876-84. [PMID: 23357303 DOI: 10.1016/j.cyto.2012.12.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2012] [Revised: 11/20/2012] [Accepted: 12/19/2012] [Indexed: 01/01/2023]
Abstract
Endochondral ossification is a dynamic process. The interaction between leptin and estrogen in this process is complicated. Whether there is a stage specific crosstalk between leptin and estrogen in the differentiation process of the chondrocytes in the growth plate remains unknown. The aim of our study was to investigate the effect of leptin on the expression of estrogen receptors and extracellular matrix in ATDC5 cells, an in vitro model of endochondral ossification. First, we quantified the physiological expressions of estrogen receptors α, β (ERα, ERβ), leptin receptor (Ob-Rb), type II and type X collagens in definite stages of endochondral ossification in ATDC5 cells using real-time PCR. Dynamic and stage specific expression characteristics of these target genes were observed. Simultaneous expressions of Ob-Rb with ERα or ERβ in ATDC5 cells were also found with dual-label confocal immunofluorescency. Then using Western blotting analysis and/or real-time PCR, we detected that, leptin treatment up-regulated the expressions of ERα, ERβ and type II collagen, but down-regulated type X collagen expression and the ERα/ERβ ratio in the chondrogenic differentiation stage. Meanwhile, leptin down-regulated the expressions of ERα, type II and type X collagens, and the ERα/ERβ ratio, but up-regulated the expression of ERβ in the hypertrophic differentiation stage. Significant positive correlation existed between ERα and type II collagen expression, and between the ratio of ERα/ERβ and type X collagen production. In summary, the crosstalk between leptin and estrogen receptor might be differentiation stage specific in ATDC5 cells.
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Affiliation(s)
- Xin-Feng Li
- Department of Orthopaedic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China
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Yonenaga K, Nishizawa S, Fujihara Y, Asawa Y, Kanazawa S, Nagata S, Takato T, Hoshi K. Application of floating cells for improved harvest in human chondrocyte culture. Biomed Res 2012; 33:281-9. [PMID: 23124248 DOI: 10.2220/biomedres.33.281] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Cell culture medium, which must be discarded during medium change, may contain many cells that do not attach to culture plates. In the present study, we focused on these floating cells and attempted to determine their usefulness for cartilage regeneration. We counted the number of floating cells discarded during medium change and compared the proliferation and differentiation between floating cells and their adherent counterparts. Chondrocyte monolayer culture at a density of 5 × 103 cells/cm(2) produced viable floating cells at a rate of 2.7-3.2 × 10(3) cells/cm(2) per primary culture. When only the floating cells from one dish were harvested and replated in another dish, the number of cells was 2.8 × 10(4) cells/cm(2) (approximately half confluency) on culture day 7. The number of cells was half of that obtained by culturing only adherent cells (5 × 10(4) cells/cm(2)). The floating and adherent cells showed similar proliferation and differentiation properties. The recovery of floating cells from the culture medium could provide an approximately 1.5-fold increase in cell number over conventional monolayer culture. Thus, the collection of floating cells may be regarded as a simple, easy, and reliable method to increase the cell harvest for chondrocytes.
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Affiliation(s)
- Kazumichi Yonenaga
- Department of 1 Cartilage & Bone Regeneration (Fujisoft), The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, Japan
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Ikeda K, Tsukui T, Imazawa Y, Horie-Inoue K, Inoue S. Conditional expression of constitutively active estrogen receptor α in chondrocytes impairs longitudinal bone growth in mice. Biochem Biophys Res Commun 2012; 425:912-7. [PMID: 22902633 DOI: 10.1016/j.bbrc.2012.07.170] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Accepted: 07/28/2012] [Indexed: 12/17/2022]
Abstract
Estrogen plays important roles in the regulation of chondrocyte proliferation and differentiation, which are essential steps for longitudinal bone growth; however, the mechanisms of estrogen action on chondrocytes have not been fully elucidated. In the present study, we generated conditional transgenic mice, designated as caERα(ColII), expressing constitutively active mutant estrogen receptor (ER) α in chondrocytes, using the chondrocyte-specific type II collagen promoter-driven Cre transgenic mice. caERα(ColII) mice showed retardation in longitudinal growth, with short bone lengths. BrdU labeling showed reduced proliferation of hypertrophic chondrocytes in the proliferating layer of the growth plate of tibia in caERα(ColII) mice. In situ hybridization analysis of type X collagen revealed that the maturation of hypertrophic chondrocytes was impaired in caERα(ColII) mice. These results suggest that ERα is a critical regulator of chondrocyte proliferation and maturation during skeletal development, mediating longitudinal bone growth in vivo.
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Affiliation(s)
- Kazuhiro Ikeda
- Division of Gene Regulation and Signal Transduction, Research Center for Genomic Medicine, Saitama Medical University, Saitama, Japan
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10
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Wang SJ, Li XF, Jiang LS, Dai LY. Estrogen stimulates leptin receptor expression in ATDC5 cells via the estrogen receptor and extracellular signal-regulated kinase pathways. J Endocrinol 2012; 213:163-72. [PMID: 22396455 DOI: 10.1530/joe-11-0353] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Regulation of the physiological processes of endochondral bone formation during long bone growth is controlled by various factors including the hormones estrogen and leptin. The effects of estrogen are mediated not only through the direct activity of estrogen receptors (ERs) but also through cross talk with other signaling systems implicated in chondrogenesis. The receptors of both estrogen and leptin (OBR (LEPR)) are detectable in growth plate chondrocytes of all zones. In this study, the expression of mRNA and protein of OBR in chondrogenic ATDC5 cells and the effect of 17β-estradiol (E(2)) stimulation were assessed using quantitative PCR and western blotting. We have found that the mRNA of Obr was dynamically expressed during the differentiation of ATDC5 cells over 21 days. Application of E(2) (10(-7) M) at day 14 for 48 h significantly upregulated OBR mRNA and protein levels (P<0.05). The upregulation of Obr mRNA by E(2) was shown to take place in a concentration-dependent manner, with a concentration of 10(-7) M E(2) having the greatest effect. Furthermore, we have confirmed that E(2) affected the phosphorylation of ERK1/2 (MAPK1/MAPK3) in a time-dependent manner where a maximal fourfold change was observed at 10 min following application of E(2). Finally, pretreatment of the cells with either U0126 (ERK1/2 inhibitor) or ICI 182 780 (ER antagonist) blocked the upregulation of OBR by E(2) and prevented the E(2)-induced phosphorylation of ERK. These data demonstrate, for the first time, the existence of cross talk between estrogen and OBR in the regulation of bone growth whereby estrogen regulates the expression of Obr in growth plate chondrocytes via ERs and the activation of ERK1/2 signaling pathways.
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Affiliation(s)
- Shan-Jin Wang
- Department of Orthopedic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, 1665 Kongjiang Road, Shanghai 200092, China
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11
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Age-Period-Cohort Analysis of Primary Bone Cancer Incidence Rates in the United States (1976–2005). Cancer Epidemiol Biomarkers Prev 2011; 20:1770-7. [DOI: 10.1158/1055-9965.epi-11-0136] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Zhong M, Carney DH, Boyan BD, Schwartz Z. 17β-Estradiol regulates rat growth plate chondrocyte apoptosis through a mitochondrial pathway not involving nitric oxide or MAPKs. Endocrinology 2011; 152:82-92. [PMID: 21068162 DOI: 10.1210/en.2010-0509] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Estrogens cause growth plate closure in both males and females, by decreasing proliferation and inducing apoptosis of postproliferative growth plate chondrocytes. In vitro studies using 17β-estradiol (E(2)) conjugated to bovine serum albumin (E(2)-BSA) show that rat costochondral growth plate resting zone chondrocytes also respond to E(2). Moreover, they are regulated by E(2)-BSA via a protein kinase C and ERK MAPK signaling pathway that is functional only in female cells. To better understand how E(2) regulates apoptosis of growth plate chondrocytes, rat resting zone chondrocytes cells were treated with E(2) or E(2)-BSA. E(2) caused apoptosis in male and female resting zone and growth zone chondrocytes in a dose-dependent manner, based on elevated DNA fragmentation, terminal deoxynucleotidyl transferase dUTP nick end labeling staining and caspase-3 activation. E(2) also up-regulated p53 and Bax protein (Bcl-2-associated X protein) levels and induced release of cytochrome C from the mitochondria, indicating a mitochondrial apoptotic pathway. The apoptotic effect of E(2) did not involve elevated nitric oxide production or MAPKs. It was reduced by ICI 182780, which is an estrogen receptor (ER) antagonist and blocked by antibodies to Erα36, a membrane-associated ER. E(2)-BSA reduced cell viability and increased caspase-3 activity; ICI 182780 had no effect, but anti-ERα36 antibodies blocked the effect. The results indicate that estrogen is able to directly affect the cell population kinetics of growth plate chondrocytes by regulating apoptosis, as well as proliferation and differentiation in both resting zone and growth zone cells. They also have provided further information about the physiological functions of estrogen on longitudinal bone growth.
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Affiliation(s)
- M Zhong
- Department of Biomedical Engineering, Georgia Institute of Technology, 315 Ferst Drive NW, Atlanta, Georgia 30332-0363, USA
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13
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Börjesson AE, Lagerquist MK, Liu C, Shao R, Windahl SH, Karlsson C, Sjögren K, Movérare-Skrtic S, Antal MC, Krust A, Mohan S, Chambon P, Sävendahl L, Ohlsson C. The role of estrogen receptor α in growth plate cartilage for longitudinal bone growth. J Bone Miner Res 2010; 25:2690-700. [PMID: 20564247 DOI: 10.1002/jbmr.156] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Revised: 05/07/2010] [Accepted: 06/04/2010] [Indexed: 11/06/2022]
Abstract
Estrogens enhance skeletal growth during early sexual maturation, whereas high estradiol levels during late puberty result in growth plate fusion in humans. Although the growth plates do not fuse directly after sexual maturation in rodents, a reduction in growth plate height is seen by treatment with a high dose of estradiol. It is unknown whether the effects of estrogens on skeletal growth are mediated directly via estrogen receptors (ERs) in growth plate cartilage and/or indirectly via other mechanisms such as the growth hormone/insulin-like growth factor 1 (GH/IGF-1) axis. To determine the role of ERα in growth plate cartilage for skeletal growth, we developed a mouse model with cartilage-specific inactivation of ERα. Although mice with total ERα inactivation displayed affected longitudinal bone growth associated with alterations in the GH/IGF-1 axis, the skeletal growth was normal during sexual maturation in mice with cartilage-specific ERα inactivation. High-dose estradiol treatment of adult mice reduced the growth plate height as a consequence of attenuated proliferation of growth plate chondrocytes in control mice but not in cartilage-specific ERα(-/-) mice. Adult cartilage-specific ERα(-/-) mice continued to grow after 4 months of age, whereas growth was limited in control mice, resulting in increased femur length in 1-year-old cartilage-specific ERα(-/-) mice compared with control mice. We conclude that during early sexual maturation, ERα in growth plate cartilage is not important for skeletal growth. In contrast, it is essential for high-dose estradiol to reduce the growth plate height in adult mice and for reduction of longitudinal bone growth in elderly mice.
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Affiliation(s)
- Anna E Börjesson
- Centre for Bone and Arthritis Research, Institute of Medicine, University of Gothenburg, Sahlgrenska Academy, Göteborg, Sweden
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Abstract
Human aromatase deficiency is a very rare syndrome characterized by congenital estrogen deprivation that is caused by loss-of-function mutations in CYP19A1, which encodes aromatase. Here, we review the presentation, diagnosis and treatment of aromatase deficiency in men to provide useful advice for clinical management of the condition. At presentation, all men with aromatase deficiency have tall stature, delayed bone maturation, osteopenia or osteoporosis and eunuchoid skeletal proportions. Diagnosis of the condition is supported by the presence of unfused epiphyses and undetectable serum estradiol levels; the condition can be further substantiated by genetic sequencing of CYP19A1. Transdermal estradiol treatment at a daily dose of about 25 microg might be adequate for lifelong replacement therapy. BMD and levels of serum estradiol, luteinizing hormone and testosterone should be monitored carefully and considered powerful biochemical markers of adequate estrogen substitution in clinical practice. Early diagnosis is important to initiate estrogen therapy as soon after puberty as possible to avoid the skeletal complications that are associated with this condition.
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Affiliation(s)
- Vincenzo Rochira
- Department of Medicine, Endocrinology and Metabolism and Geriatrics, University of Modena and Reggio Emilia, Modena, Italy.
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Grifone TJ, Haupt HM, Podolski V, Brooks JJ. Immunohistochemical expression of estrogen receptors in chondrosarcomas and enchondromas. Int J Surg Pathol 2008; 16:31-7. [PMID: 18203781 DOI: 10.1177/1066896907306774] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Immunohistochemical expression of estrogen receptors alpha and beta was studied in chondrosarcomas and enchondromas and was correlated with chondrosarcoma grade, type, and dedifferentiation. Estrogen receptor alpha was studied in 37 chondrosarcomas, 10 enchondromas, and 2 extraskeletal myxoid chondrosarcomas. Estrogen receptor beta was studied in 23 chondrosarcomas, 6 enchondromas, and 2 extraskeletal myxoid chondrosarcomas. Ventana prediluted monoclonal anti-ER alpha (clone 6F11) and Biogenex prediluted polyclonal anti-ER beta were used on the Ventana ES autostainer and BenchMark XT IHC/ISH, respectively. Percent of cell staining and intensity (+, ++, or +++) was evaluated. Overall, 61% of conventional chondrosarcoma and 60% of enchondroma were positive for estrogen receptor alpha. Low-grade chondrosarcoma expressed estrogen receptor alpha more frequently than high-grade chondrosarcoma (P<or=.001). Extraskeletal myxoid chondrosarcomas expressed estrogen receptor alpha; it was not expressed in dedifferentiated chondrosarcoma. Overall, 89% of conventional chondrosarcomas and 83% of enchondromas were positive for estrogen receptor beta. Low-grade chondrosarcomas expressed estrogen receptor beta more frequently than high-grade chondrosarcomas (P<or=.05). Extraskeletal myxoid chondrosarcomas expressed estrogen receptor beta; it was frequently lost in dedifferentiated chondrosarcoma.
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Affiliation(s)
- Thomas J Grifone
- Department of Pathology, Pennsylvania Hospital of the University of Pennsylvania Health System, Philadelphia 19107, USA
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16
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Takano H, Aizawa T, Irie T, Itoi E, Kokubun S, Roach HI. Normal Bone Growth Requires Optimal Estrogen Levels: Negative Effects of Both High and Low Dose Estrogen on the Number of Growth Plate Chondrocytes. TOHOKU J EXP MED 2008; 214:269-80. [DOI: 10.1620/tjem.214.269] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Hiroyuki Takano
- Department of Orthopaedic Surgery, Tohoku University School of Medicine
| | - Toshimi Aizawa
- Department of Orthopaedic Surgery, Tohoku University School of Medicine
| | - Taichi Irie
- Department of Orthopaedic Surgery, Tohoku University School of Medicine
| | - Eiji Itoi
- Department of Orthopaedic Surgery, Tohoku University School of Medicine
| | - Shoichi Kokubun
- Department of Orthopaedic Surgery, Tohoku University School of Medicine
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17
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Abstract
Longitudinal growth, which is primarily due to chondrocytic activity at the level of the epiphyseal growth plate, is influenced by many hormones and growth factors in an endocrine and paracrine manner. Their influence is even more complex during the accelerated growth period of puberty that accounts for about 20% of final adult height. Although abnormalities of growth during puberty are very common, the underlying mechanisms that govern the beginning and cessation of pubertal growth at the level of the growth plate are poorly understood. Sex steroids play a crucial role in pubertal growth both at the systemic level via the GH/IGF-1 axis and at the local level of the epiphyseal growth plate. In both sexes it is now accepted that oestrogen is the critical hormone in controlling growth plate acceleration and fusion. This paper reviews the mechanisms that influence pubertal growth and the problems that are associated with disorders of gonadal function.
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Affiliation(s)
- R J Perry
- Bone & Endocrine Research Group, Royal Hospital for Sick Children, Glasgow, UK.
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18
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Liu G, Kawaguchi H, Ogasawara T, Asawa Y, Kishimoto J, Takahashi T, Chung UI, Yamaoka H, Asato H, Nakamura K, Takato T, Hoshi K. Optimal Combination of Soluble Factors for Tissue Engineering of Permanent Cartilage from Cultured Human Chondrocytes. J Biol Chem 2007; 282:20407-15. [PMID: 17493933 DOI: 10.1074/jbc.m608383200] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Since permanent cartilage has poor self-regenerative capacity, its regeneration from autologous human chondrocytes using a tissue engineering technique may greatly benefit the treatment of various skeletal disorders. However, the conventional autologous chondrocyte implantation is insufficient both in quantity and in quality due to two major limitations: dedifferentiation during a long term culture for multiplication and hypertrophic differentiation by stimulation for the redifferentiation. To overcome the limitations, this study attempted to determine the optimal combination in primary human chondrocyte cultures under a serum-free condition, from among 12 putative chondrocyte regulators. From the exhaustive 2(12) = 4,096 combinations, 256 were selected by fractional factorial design, and bone morphogenetic protein-2 and insulin (BI) were statistically determined to be the most effective combination causing redifferentiation of the dedifferentiated cells after repeated passaging. We further found that the addition of triiodothyronine (T3) prevented the BI-induced hypertrophic differentiation of redifferentiated chondrocytes via the suppression of Akt signaling. The implant formed by the human chondrocytes cultured in atelocollagen and poly(l-latic acid) scaffold under the BI + T3 stimulation consisted of sufficient hyaline cartilage with mechanical properties comparable with native cartilage after transplantation in nude mice, indicating that BI + T3 is the optimal combination to regenerate a clinically practical permanent cartilage from autologous chondrocytes.
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Affiliation(s)
- Guangyao Liu
- Departments of Cartilage and Bone Regeneration (Fujisoft), and Sensory and Motor System Medicine, Faculty of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan
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19
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Takano H, Aizawa T, Irie T, Kokubun S, Itoi E. Estrogen deficiency leads to decrease in chondrocyte numbers in the rabbit growth plate. J Orthop Sci 2007; 12:366-74. [PMID: 17657557 DOI: 10.1007/s00776-007-1145-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2006] [Accepted: 04/24/2007] [Indexed: 02/09/2023]
Abstract
BACKGROUND In the pubertal growth plate, sex hormones play important roles in regulating the proliferation, differentiation, maturation, and programmed death of chondrocytes. Although many studies have been reported on the regulation of estrogen in long-bone growth, some of the mechanisms have remained unclear, including its role in cell kinetics in growth plate chondrocytes. The aim of this study was to clarify the effect of a deficiency of estrogen on growth plate chondrocytes. METHODS We obtained growth plates of the femoral head from normal and ovariectomized Japanese white rabbits at 10, 15, 20, and 25 weeks of age. The effects of estrogen deficiency on the cell kinetics of growth plate chondrocytes were investigated immunohistochemically using antibodies for an apoptotic marker, caspase-3, and for proliferating cell nuclear antigen (PCNA). RESULTS Both the length of the femur and the height of the growth plate in the ovariectomized rabbits tended to be larger than those in the normal rabbits. There were fewer chondrocytes in the ovariectomized rabbits than in the normal ones. Caspase-3-positive cells were detected mainly in the hypertrophic zone, whereas PCNA-positive cells were found in the proliferating to upper hypertrophic zones. The ovariectomized rabbits showed a higher caspase-3-positive rate at 20 weeks of age and a lower PCNA-positive ratio in all age groups than the normal rabbits. CONCLUSIONS This study indicated that ovariectomy led to a decreased number of growth plate chondrocytes, which resulted from decreased cell-proliferating ability and probably acceleration of the number of chondrocytes undergoing apoptosis.
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Affiliation(s)
- Hiroyuki Takano
- Department of Orthopaedic Surgery, Tohoku University School of Medicine, 1-1 Seiryo-machi, Sendai, Japan
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20
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Serrat MA, Lovejoy CO, King D. Age- and site-specific decline in insulin-like growth factor-I receptor expression is correlated with differential growth plate activity in the mouse hindlimb. Anat Rec (Hoboken) 2007; 290:375-81. [PMID: 17514762 DOI: 10.1002/ar.20480] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The proximal and distal growth plates of the principal long bones do not contribute equally to longitudinal growth. Most forelimb elongation occurs at the shoulder and wrist, while most hindlimb growth occurs at the knee. This study examined whether insulin-like growth factor-I (IGF-I), a potent growth regulator, could underlie this variation via differential receptor expression. The spatiotemporal distribution of the IGF-I receptor (IGF-IR) was mapped in hindlimb growth plates (overall and within regional zones) from immature mice using immunohistochemistry. Growth activity was assessed by size/morphology of the growth plate and proliferating cell nuclear antigen (PCNA) expression. Both IGF-IR and PCNA staining declined considerably with age in the proximal femur and distal tibia (hip and ankle), but expression remained high in the more active distal femur and proximal tibia (knee) throughout growth. Growth plate size decreased with age in all sites, but the absolute and relative decline in IGF-IR in the hips and ankles of older mice indicated a site-specific loss of IGF-I sensitivity in these less active regions. These results suggest that regulation of the IGF-IR may at least partially mediate differential long bone growth, thereby providing a local mechanism for altering skeletal proportions absent modification of systemic hormone levels.
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Affiliation(s)
- Maria A Serrat
- Department of Anthropology and School of Biomedical Sciences, Kent State University, Kent, Ohio 44242, USA.
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21
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Baldock PA, Allison S, McDonald MM, Sainsbury A, Enriquez RF, Little DG, Eisman JA, Gardiner EM, Herzog H. Hypothalamic regulation of cortical bone mass: opposing activity of Y2 receptor and leptin pathways. J Bone Miner Res 2006; 21:1600-7. [PMID: 16995815 DOI: 10.1359/jbmr.060705] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
UNLABELLED NeuropeptideY-, Y2 receptor (Y2)-, and leptin-deficient mice show similar anabolic action in cancellous bone but have not been assessed in cortical bone. Cortical bone mass is elevated in Y2(-/-) mice through greater osteoblast activity. In contrast, leptin deficiency results in reduced bone mass. We show opposing central regulation of cortical bone. INTRODUCTION Treatment of osteoporosis is confounded by a lack of agents capable of stimulating the formation of bone by osteoblasts. Recently, the brain has been identified as a potent anabolic regulator of bone formation. Hypothalamic leptin or Y2 receptor signaling are known to regulate osteoblast activity in cancellous bone. However, assessment of these pathways in the structural cortical bone is critical to understanding their role in skeletal health and their potential clinical relevance to osteoporosis and its treatment. MATERIALS AND METHODS Long bones of 16-week male ob/ob and germline and hypothalamic Y2(-/-) mice were assessed by QCT. Cortical osteoblast activity was assessed histologically. RESULTS The femora of skeletally mature Y2(-/-) mice and of leptin-deficient ob/ob and Y2(-/-)ob/ob mice were assessed for changes in cortical osteoblast activity and bone mass. Ablation of Y2 receptors increased osteoblast activity on both endosteal and periosteal surfaces, independent of leptin, resulting in increased cortical bone mass and density in Y2(-/-) mice along the entire femur. Importantly, these changes were evident after deletion of hypothalamic Y2 receptors in adult mice, with a 5-fold elevation in periosteal bone formation. This is in marked contrast to leptin-deficient models that displayed reduced cortical mass and density. These changes were associated with substantial differences in calculated strength between the Y2(-/-) and leptin-deficient mice. CONCLUSIONS These results indicate that the Y2-mediated anabolic pathway stimulates cortical and cancellous bone formation, whereas the leptin-mediated pathway has opposing effects in cortical and cancellous bone, diminishing the production of cortical bone. The findings from conditional hypothalamic Y2 knockout show a novel, inducible control mechanism for cortical bone formation and a potential new pathway for anabolic treatment of osteoporosis.
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Affiliation(s)
- Paul A Baldock
- Bone and Mineral Program, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, Sydney, New South Wales, Australia.
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22
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Cleton-Jansen AM, van Beerendonk HM, Baelde HJ, Bovée JVGM, Karperien M, Hogendoorn PCW. Estrogen Signaling Is Active in Cartilaginous Tumors: Implications for Antiestrogen Therapy as Treatment Option of Metastasized or Irresectable Chondrosarcoma. Clin Cancer Res 2005; 11:8028-35. [PMID: 16299232 DOI: 10.1158/1078-0432.ccr-05-1253] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Chondrosarcoma is a malignant cartilaginous matrix-producing tumor that can be lethal in 10% to 50% of the patients. Surgery is the only effective treatment known as these tumors are notorious refractory to all types of conventional chemotherapy or radiotherapy. To identify a target for therapy, we want to determine whether estrogen signaling is active in chondrosarcoma because estrogen is important in the regulation of longitudinal growth that is initiated by chondrocyte proliferation and differentiation in the epiphyseal growth plate of long bones. EXPERIMENTAL DESIGN We studied protein expression of the estrogen receptor in 35 cartilaginous tumors as well as mRNA levels for the estrogen receptor and for aromatase, an enzyme for estrogen synthesis and another potential therapeutic target. Furthermore, the activity of aromatase was determined in vitro by the tritiated water release assay. Dose-response experiments with chondrosarcoma cultured cells were done with estrogen, androstenedione, and exemestane. RESULTS All chondrosarcomas tested showed mRNA and nuclear protein expression of the estrogen receptor. Also, aromatase mRNA was detected. The aromatase activity assay showed a functional aromatase enzyme in primary chondrosarcoma cultures and in a cell line. Growth of chondrosarcoma cell cultures can be stimulated by adding estrogen or androstenedione, which can be inhibited by exemestane. CONCLUSIONS These results show, on the RNA, protein, and cell biological levels, that the ligand and the receptor are active in estrogen-mediated signal transduction. This observation implicates potential use of targeted drugs that interfere with estrogen signaling, such as those applied for treating breast cancer.
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