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Mançanares ACF, Cabezas J, Manríquez J, de Oliveira VC, Wong Alvaro YS, Rojas D, Navarrete Aguirre F, Rodriguez-Alvarez L, Castro FO. Edition of Prostaglandin E2 Receptors EP2 and EP4 by CRISPR/Cas9 Technology in Equine Adipose Mesenchymal Stem Cells. Animals (Basel) 2020; 10:E1078. [PMID: 32585798 PMCID: PMC7341266 DOI: 10.3390/ani10061078] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 06/10/2020] [Accepted: 06/11/2020] [Indexed: 01/14/2023] Open
Abstract
In mesenchymal stem cells (MSCs), it has been reported that prostaglandin E2 (PGE2) stimulation of EP2 and EP4 receptors triggers processes such as migration, self-renewal, survival, and proliferation, and their activation is involved in homing. The aim of this work was to establish a genetically modified adipose (aMSC) model in which receptor genes EP2 and EP4 were edited separately using the CRISPR/Cas9 system. After edition, the genes were evaluated as to if the expression of MSC surface markers was affected, as well as the migration capacity in vitro of the generated cells. Adipose MSCs were obtained from Chilean breed horses and cultured in DMEM High Glucose with 10% fetal bovine serum (FBS). sgRNA were cloned into a linearized LentiCRISPRv2GFP vector and transfected into HEK293FT cells for producing viral particles that were used to transduce aMSCs. GFP-expressing cells were separated by sorting to obtain individual clones. Genomic DNA was amplified, and the site-directed mutation frequency was assessed by T7E1, followed by Sanger sequencing. We selected 11 clones of EP2 and 10 clones of EP4, and by Sanger sequencing we confirmed 1 clone knock-out to aMSC/EP2 and one heterozygous mutant clone of aMSC/EP4. Both edited cells had decreased expression of EP2 and EP4 receptors when compared to the wild type, and the edition of EP2 and EP4 did not affect the expression of MSC surface markers, showing the same pattern in filling the scratch. We can conclude that the edition of these receptors in aMSCs does not affect their surface marker phenotype and migration ability when compared to wild-type cells.
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Affiliation(s)
- Ana Carolina Furlanetto Mançanares
- Department of Animal Science, Faculty of Veterinary Science, Universidad de Concepción, Campus Chillan, Chillán 3780000, Chile; (J.C.); (J.M.); (Y.S.W.A.); (F.N.A.); (L.R.-A.)
| | - Joel Cabezas
- Department of Animal Science, Faculty of Veterinary Science, Universidad de Concepción, Campus Chillan, Chillán 3780000, Chile; (J.C.); (J.M.); (Y.S.W.A.); (F.N.A.); (L.R.-A.)
| | - José Manríquez
- Department of Animal Science, Faculty of Veterinary Science, Universidad de Concepción, Campus Chillan, Chillán 3780000, Chile; (J.C.); (J.M.); (Y.S.W.A.); (F.N.A.); (L.R.-A.)
| | - Vanessa Cristina de Oliveira
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of São Paulo, Pirassununga, São Paulo 13630-000, Brazil;
| | - Yat Sen Wong Alvaro
- Department of Animal Science, Faculty of Veterinary Science, Universidad de Concepción, Campus Chillan, Chillán 3780000, Chile; (J.C.); (J.M.); (Y.S.W.A.); (F.N.A.); (L.R.-A.)
| | - Daniela Rojas
- Department of Animal Pathology, Faculty of Veterinary Sciences, Universidad de Concepción, Campus Chillan, Chillán 3780000, Chile;
| | - Felipe Navarrete Aguirre
- Department of Animal Science, Faculty of Veterinary Science, Universidad de Concepción, Campus Chillan, Chillán 3780000, Chile; (J.C.); (J.M.); (Y.S.W.A.); (F.N.A.); (L.R.-A.)
| | - Lleretny Rodriguez-Alvarez
- Department of Animal Science, Faculty of Veterinary Science, Universidad de Concepción, Campus Chillan, Chillán 3780000, Chile; (J.C.); (J.M.); (Y.S.W.A.); (F.N.A.); (L.R.-A.)
| | - Fidel Ovidio Castro
- Department of Animal Science, Faculty of Veterinary Science, Universidad de Concepción, Campus Chillan, Chillán 3780000, Chile; (J.C.); (J.M.); (Y.S.W.A.); (F.N.A.); (L.R.-A.)
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Abstract
Prostaglandins (PGs) are highly bioactive fatty acids. PGs, especially prostaglandin E2 (PGE2), are abundantly produced by cells of both the bone-forming (osteoblast) lineage and the bone-resorbing (osteoclast) lineage. The inducible cyclooxygenase, COX-2, is largely responsible for most PGE2 production in bone, and once released, PGE2 is rapidly degraded in vivo. COX-2 is induced by multiple agonists - hormones, growth factors, and proinflammatory factors - and the resulting PGE2 may mediate, amplify, or, as we have recently shown for parathyroid hormone (PTH), inhibit responses to these agonists. In vitro, PGE2 can directly stimulate osteoblast differentiation and, indirectly via stimulation of RANKL in osteoblastic cells, stimulate the differentiation of osteoclasts. The net balance of these two effects of PGE2 in vivo on bone formation and bone resorption has been hard to predict and, as expected for such a widespread local factor, hard to study. Some of the complexity of PGE2 actions on bone can be explained by the fact that there are four receptors for PGE2 (EP1-4). Some of the major actions of PGE2 in vitro occur via EP2 and EP4, both of which can stimulate cAMP signaling, but there are other distinct signaling pathways, important in other tissues, which have not yet been fully elucidated in bone cells. Giving PGE2 or agonists of EP2 and EP4 to accelerate bone repair has been examined with positive results. Further studies to clarify the pathways of PGE2 action in bone may allow us to identify new and more effective ways to deliver the therapeutic benefits of PGE2 in skeletal disorders.
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Affiliation(s)
- Carol Pilbeam
- Department of Medicine and Musculoskeletal Institute, UConn Health, Farmington, CT, USA.
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Wirrig EE, Gomez MV, Hinton RB, Yutzey KE. COX2 inhibition reduces aortic valve calcification in vivo. Arterioscler Thromb Vasc Biol 2015; 35:938-47. [PMID: 25722432 DOI: 10.1161/atvbaha.114.305159] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
OBJECTIVE Calcific aortic valve disease (CAVD) is a significant cause of morbidity and mortality, which affects ≈1% of the US population and is characterized by calcific nodule formation and stenosis of the valve. Klotho-deficient mice were used to study the molecular mechanisms of CAVD as they develop robust aortic valve (AoV) calcification. Through microarray analysis of AoV tissues from klotho-deficient and wild-type mice, increased expression of the gene encoding cyclooxygenase 2 (COX2; Ptgs2) was found. COX2 activity contributes to bone differentiation and homeostasis, thus the contribution of COX2 activity to AoV calcification was assessed. APPROACH AND RESULTS In klotho-deficient mice, COX2 expression is increased throughout regions of valve calcification and is induced in the valvular interstitial cells before calcification formation. Similarly, COX2 expression is increased in human diseased AoVs. Treatment of cultured porcine aortic valvular interstitial cells with osteogenic media induces bone marker gene expression and calcification in vitro, which is blocked by inhibition of COX2 activity. In vivo, genetic loss of function of COX2 cyclooxygenase activity partially rescues AoV calcification in klotho-deficient mice. Moreover, pharmacological inhibition of COX2 activity in klotho-deficient mice via celecoxib-containing diet reduces AoV calcification and blocks osteogenic gene expression. CONCLUSIONS COX2 expression is upregulated in CAVD, and its activity contributes to osteogenic gene induction and valve calcification in vitro and in vivo.
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Affiliation(s)
- Elaine E Wirrig
- From The Heart Institute, Cincinnati Children's Hospital Medical Center, OH
| | - M Victoria Gomez
- From The Heart Institute, Cincinnati Children's Hospital Medical Center, OH
| | - Robert B Hinton
- From The Heart Institute, Cincinnati Children's Hospital Medical Center, OH
| | - Katherine E Yutzey
- From The Heart Institute, Cincinnati Children's Hospital Medical Center, OH.
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Choudhary S, Blackwell K, Voznesensky O, Roy AD, Pilbeam C. Prostaglandin E2 acts via bone marrow macrophages to block PTH-stimulated osteoblast differentiation in vitro. Bone 2013; 56:31-41. [PMID: 23639875 PMCID: PMC4073290 DOI: 10.1016/j.bone.2013.04.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 04/19/2013] [Accepted: 04/20/2013] [Indexed: 12/26/2022]
Abstract
Intermittent PTH is the major anabolic therapy for osteoporosis while continuous PTH causes bone loss. PTH acts on the osteoblast (OB) lineage to regulate bone resorption and formation. PTH also induces cyclooxygenase-2 (COX-2), producing prostaglandin E2 (PGE(2)) that can act on both OBs and osteoclasts (OCs). Because intermittent PTH is more anabolic in Cox-2 knockout (KO) than wild type (WT) mice, we hypothesized COX-2 might contribute to the effects of continuous PTH by suppressing PTH-stimulated differentiation of mesenchymal stem cells into OBs. We compared effects of continuous PTH on bone marrow stromal cells (BMSCs) and primary OBs (POBs) from Cox-2 KO mice, mice with deletion of PGE(2) receptors (Ptger(4) and Ptger(2) KO mice), and WT controls. PTH increased OB differentiation in BMSCs only in the absence of COX-2 expression or activity. In the absence of COX-2, PTH stimulated differentiation if added during the first week of culture. In Cox-2 KO BMSCs, PTH-stimulated differentiation was prevented by adding PGE(2) to cultures. Co-culture of POBs with M-CSF-expanded bone marrow macrophages (BMMs) showed that the inhibition of PTH-stimulated OB differentiation required not only COX-2 or PGE(2) but also BMMs. Sufficient PGE(2) to mediate the inhibitory effect was made by either WT POBs or WT BMMs. The inhibitory effect mediated by COX-2/PGE(2) was transferred by conditioned media from RANKL-treated BMMs and could be blocked by osteoprotegerin, which interferes with RANKL binding to its receptor on OC lineage cells. Deletion of Ptger(4), but not Ptger(2), in BMMs prevented the inhibition of PTH-stimulated OB differentiation. As expected, PGE(2) also stimulated OB differentiation, but when given in combination with PTH, the stimulatory effects of both were abrogated. These data suggest that PGE(2), acting via EP4R on BMMs committed to the OC lineage, stimulated secretion of a factor or factors that acted to suppress PTH-stimulated OB differentiation. This suppression of OB differentiation could contribute to the bone loss seen with continuous PTH in vivo.
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MESH Headings
- Adipogenesis/drug effects
- Adipogenesis/genetics
- Animals
- Bone Marrow Cells/cytology
- Bone Marrow Cells/drug effects
- Bone Marrow Cells/metabolism
- Cattle
- Cell Differentiation/drug effects
- Cell Differentiation/genetics
- Cells, Cultured
- Culture Media, Conditioned/pharmacology
- Cyclooxygenase 2/metabolism
- Dinoprostone/pharmacology
- Gene Expression Regulation/drug effects
- Hematopoietic System/cytology
- Macrophages/cytology
- Macrophages/drug effects
- Macrophages/metabolism
- Mice
- Mice, Knockout
- Osteoblasts/cytology
- Osteoblasts/drug effects
- Osteoblasts/enzymology
- Osteocalcin/genetics
- Osteocalcin/metabolism
- Parathyroid Hormone/pharmacology
- RANK Ligand/pharmacology
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Receptors, Prostaglandin E, EP2 Subtype/deficiency
- Receptors, Prostaglandin E, EP2 Subtype/metabolism
- Receptors, Prostaglandin E, EP4 Subtype/deficiency
- Receptors, Prostaglandin E, EP4 Subtype/metabolism
- Stromal Cells/cytology
- Stromal Cells/drug effects
- Stromal Cells/enzymology
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Affiliation(s)
| | | | | | | | - Carol Pilbeam
- Corresponding author at: University of Connecticut Health Center, 263 Farmington Avenue, MC5456, Farmington, CT 06030, USA. Fax: +1 860 679 1932. (C. Pilbeam)
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Haversath M, Catelas I, Li X, Tassemeier T, Jäger M. PGE2 and BMP-2 in bone and cartilage metabolism: 2 intertwining pathways. Can J Physiol Pharmacol 2012. [DOI: 10.1139/y2012-123] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Osteoarthritis and lesions to cartilage tissue are diseases that frequently result in impaired joint function and patient disability. The treatment of osteoarthritis, along with local bone defects and systemic skeletal diseases, remains a significant clinical challenge for orthopaedic surgeons. Several bone morphogenetic proteins (BMPs) are known to have osteoinductive effects, whereof BMP-2 and BMP-7 are already approved for clinical applications. There is growing evidence that the metabolism of bone as well as the cartilage damage associated with the above disease processes are strongly inter-related with the interactions of the inflammation-related pathways (in particular prostaglandin E2 (PGE2)) and osteogenesis (in particular bone morphogenetic protein-2 (BMP-2)). There is strong evidence that the pathways of prostaglandins and bone morphogenetic proteins are intertwined, and they have recently come into focus in several experimental and clinical studies. This paper focuses on PGE2 and BMP-2 intertwining pathways in bone and cartilage metabolism, and summarizes the recent experimental and clinical data.
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Affiliation(s)
- Marcel Haversath
- Orthopaedic Department, University Hospital, University of Duisburg-Essen, Hufelandstrasse 55, D-45147 Essen, Germany
| | - Isabelle Catelas
- Department of Mechanical Engineering, Department of Surgery, and Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON K1N 6N5, Canada; Department of Mechanical Engineering, University of Ottawa, 161 Louis Pasteur A-206, Ottawa, ON K1N 6N5, Canada
| | - Xinning Li
- Department of Orthopaedic Surgery, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA 01655, USA
| | - Tjark Tassemeier
- Orthopaedic Department, University Hospital, University of Duisburg-Essen, Hufelandstrasse 55, D-45147 Essen, Germany
| | - Marcus Jäger
- Orthopaedic Department, University Hospital, University of Duisburg-Essen, Hufelandstrasse 55, D-45147 Essen, Germany
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Di Francesco S, Castellan P, Manco R, Tenaglia RL. Reciprocal cross-talk between Prostaglandin E2 and bone in prostate cancer: a current review. Cent European J Urol 2011; 64:201-4. [PMID: 24578893 PMCID: PMC3921745 DOI: 10.5173/ceju.2011.04.art2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Revised: 08/10/2011] [Accepted: 08/16/2011] [Indexed: 01/08/2023] Open
Abstract
In this review we analyzed the role of PGE2 as a possible regulator of bone metabolism and bone metastases in prostate cancer. Published studies were identified by searching computerized bibliographic systems from January 1st, 2000 to July 1st, 2011. PGE2 represents a key factor in the modulation of bone metabolism and bone metastatic disease in prostate cancer interacting with bone regulatory signals including the RANK/RANKL/OPG system and Wnt pathways. A high concentration of PGE2 exerts a prevalent stimulatory effect on osteoclastogenesis via OPG/RANK/RANKL axis activation and a inhibitory effect on osteoblastogenesis trough inhibition of Wnt pathway. An inversely low level of PGE2 exerts a stimulatory effect on osteoblastogenesis via activation of the Wnt pathway. Our finding suggests that PGE2 acts as a regulator in maintaining normal bone mass and indicate a mechanism whereby chemical manipulation of PGE2 levels or signaling may be therapeutically beneficial for prostate cancer treatment.
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Affiliation(s)
- Simona Di Francesco
- Department of Medicine and Aging Science, Section of Clinical Urology, ''G. D'Annunzio'' University, Chieti, Italy
| | - Pietro Castellan
- Department of Medicine and Aging Science, Section of Clinical Urology, ''G. D'Annunzio'' University, Chieti, Italy
| | - Rossella Manco
- Department of Medicine and Aging Science, Section of Clinical Urology, ''G. D'Annunzio'' University, Chieti, Italy
| | - Raffaele L Tenaglia
- Department of Medicine and Aging Science, Section of Clinical Urology, ''G. D'Annunzio'' University, Chieti, Italy
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7
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Rego EB, Inubushi T, Kawazoe A, Miyauchi M, Tanaka E, Takata T, Tanne K. Effect of PGE2 induced by compressive and tensile stresses on cementoblast differentiation in vitro. Arch Oral Biol 2011; 56:1238-46. [DOI: 10.1016/j.archoralbio.2011.05.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2011] [Revised: 05/17/2011] [Accepted: 05/17/2011] [Indexed: 12/12/2022]
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Galea GL, Sunters A, Meakin LB, Zaman G, Sugiyama T, Lanyon LE, Price JS. Sost down-regulation by mechanical strain in human osteoblastic cells involves PGE2 signaling via EP4. FEBS Lett 2011; 585:2450-4. [PMID: 21723865 PMCID: PMC3149668 DOI: 10.1016/j.febslet.2011.06.019] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2011] [Revised: 06/02/2011] [Accepted: 06/17/2011] [Indexed: 11/29/2022]
Abstract
Sclerostin is a potent inhibitor of bone formation which is down-regulated by mechanical loading. To investigate the mechanisms involved we subjected Saos2 human osteoblastic cells to short periods of dynamic strain and used quantitative reverse transcriptase polymerase chain reaction to compare their responses to unstrained controls. Strain-induced Sost down-regulation was recapitulated by cyclo-oxygenase-2-mediated PGE2, acting through the EP4 receptor, whereas strain-related up-regulation of osteocalcin was mediated by the EP2 receptor. Strain-related Sost regulation required extracellular signal-regulated kinase signaling, whereas osteocalcin required protein kinase C. These findings indicate early divergence in the signaling pathways stimulated by strain and establish PGE2/EP4 as the pathway used by strain to regulate Sost expression.
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Key Words
- pth, parathyroid hormone
- bmp, bone morphogenetic protein
- cox, cyclo-oxygenase
- pg, prostaglandin
- tcs, tcs2510
- qrt-pcr, quantitative reverse transcriptase polymerase chain reaction
- pka, protein kinase a
- pkc, protein kinase c
- erk, extracellular signal-regulated kinase
- mapk, mitogen activated protein kinase
- sclerostin
- pge2 signaling
- mechanical strain
- osteoporosis
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Affiliation(s)
- Gabriel L Galea
- School of Veterinary Sciences, University of Bristol, Bristol, United Kingdom.
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9
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Maoqiang L, Zhenan Z, Fengxiang L, Gang W, Yuanqing M, Ming L, Xin Z, Tingting T. Enhancement of osteoblast differentiation that is inhibited by titanium particles through inactivation of NFATc1 by VIVIT peptide. J Biomed Mater Res A 2011; 95:727-34. [PMID: 20725976 DOI: 10.1002/jbm.a.32891] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Bone formation, which is inhibited by particulate wear debris, is a pathological factor that contributes to periprosthetic osteolysis. Although the nuclear factor of activated T cells c1 (NFATc1) is known to be involved in osteoblast differentiation, and its effect on osteoblasts in response to wear particles remains unclear. In this study, we investigated the role of NFATc1 in the regulation of osteoblastic differentiation of rat calvaria (RC) cells (a cell-culture model comprising many osteoprogenitors) that were challenged with titanium (Ti) particles. The results showed that the Ti particles inhibited osteoblastic differentiation and mineralization of RC cells. NFATc1 plays a critical role in the Ti-particle inhibition process of the osteoblastic differentiation in RC cells. Inactivation of NFATc1 by the 11R-VIVIT peptide potently enhanced osteoblast differentiation and mineralization inhibition by the Ti particles. The 11R-VIVIT peptide does not have a toxic effect on the RC cells. On the basis of these data, we conclude that inactivation of NFATc1 by the 11R-VIVIT peptide may provide a promising therapeutic target for the treatment of periprosthetic osteolysis by increasing bone formation.
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Affiliation(s)
- Li Maoqiang
- Department of Orthopaedic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, 639 Zhi Zao Ju Road, Shanghai, China
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10
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Styner M, Sen B, Xie Z, Case N, Rubin J. Indomethacin promotes adipogenesis of mesenchymal stem cells through a cyclooxygenase independent mechanism. J Cell Biochem 2011; 111:1042-50. [PMID: 20672310 DOI: 10.1002/jcb.22793] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Regulation of mesenchymal stem cell (MSC) lineage selection is important for the generation of bone mass. Inhibition of cyclooxygenase-2 (COX2) may increase adipogenesis at the cost of decreasing osteoprogenitor output. Here we investigated the role of COX2 and its products during MSC differentiation. Indomethacin stimulated adipogenesis (increased aP2, adiponectin and lipid droplets) of CH310T1/2 stem cells as well as marrow-derived MSCs to a degree similar to the PPARγ2 ligand, rosiglitazone. Unlike rosiglitazone, indomethacin significantly upregulated PPARγ2 expression. Indomethacin and the COX2 specific inhibitor celecoxib suppressed PGE2 production, but celecoxib did not induce adipogenesis. As well, addition of PGE2 failed to reverse indomethacin induced adipogenesis, indicating that indomethacin's effects were prostaglandin independent. In MSCs over-expressing PPARγ2 and RXRα, indomethacin did not increase PPAR-induced transcription, while rosiglitazone and 15d-PGJ2 did (1.7- and 1.3-fold, respectively, P < 0.001). We considered whether indomethacin might directly affect C/EBPβ proximally to PPARγ2 induction. Indomethacin significantly increased C/EBPβ expression and protein within 24 h of addition. These results indicate that indomethacin promotes adipogenesis by increasing C/EBPβ and PPARγ2 expression in a prostaglandin-independent fashion. This effect of indomethacin is pertinent to potential deleterious effects of this commonly used anti-inflammatory drug on bone remodeling and tissue healing.
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Affiliation(s)
- Maya Styner
- Department of Medicine, University of North Carolina, Chapel Hill, North Carolina 27599-7170, USA.
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11
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Rego EB, Inubushi T, Kawazoe A, Tanimoto K, Miyauchi M, Tanaka E, Takata T, Tanne K. Ultrasound stimulation induces PGE(2) synthesis promoting cementoblastic differentiation through EP2/EP4 receptor pathway. ULTRASOUND IN MEDICINE & BIOLOGY 2010; 36:907-915. [PMID: 20447753 DOI: 10.1016/j.ultrasmedbio.2010.03.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2009] [Revised: 02/25/2010] [Accepted: 03/10/2010] [Indexed: 05/29/2023]
Abstract
The present study aims to provide insights into how ultrasound treatment (US) can affect the regenerative response of cementum by evaluating the role of prostaglandin E(2) induced by ultrasound stimulation on cementoblastic differentiation. The mouse cementoblast cell line OCCM-30 was exposed to low-intensity ultrasound and the cyclooxygenase-2 (COX-2) mRNA expression and prostaglandin E(2) (PGE(2)) production were quantified. The role of the US-induced PGE(2) in mineralization was examined using COX-2 inhibitor and prostaglandin receptors (EP-receptors) agonists and antagonists. In addition, gene expression of differentiation markers related to mineral metabolism was evaluated. Ultrasound significantly enhanced COX-2 mRNA expression and PGE(2) production. PGE(2) induced by US mediated mineral nodule formation, whereas COX-2 inhibitor treatment eliminated the enhancement of mineralization induced by US stimulation. Mineral deposition was also inhibited by treatment with EP2 or EP4 antagonist. Moreover, up-regulation of differentiation markers induced by US was suppressed by treatment with COX-2 inhibitor. The present findings provide evidence that US stimulation has a positive effect on mineralization ability of cementoblasts through the activation of EP2/EP4 pathway, suggesting that US can be a promising therapeutic tool for cementum repair.
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Affiliation(s)
- Emanuel Braga Rego
- Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences, Hiroshima, Japan.
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12
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Gao Q, Zhan P, Alander CB, Kream BE, Hao C, Breyer MD, Pilbeam CC, Raisz LG. Effects of global or targeted deletion of the EP4 receptor on the response of osteoblasts to prostaglandin in vitro and on bone histomorphometry in aged mice. Bone 2009; 45:98-103. [PMID: 19344793 DOI: 10.1016/j.bone.2009.03.667] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2008] [Revised: 03/09/2009] [Accepted: 03/24/2009] [Indexed: 11/22/2022]
Abstract
Because global deletion of the prostaglandin EP4 receptor results in neonatal lethality, we generated a mouse with targeted EP4 receptor deletion using Cre-LoxP methodology and a 2.3 kb collagen I a1 promoter driving Cre recombinase that is selective for osteoblastic cells. We compared wild type (WT), global heterozygote (G-HET), targeted heterozygote (T-HET) and knockout (KO) mice. KO mice had one targeted and one global deletion of the EP4 receptor. All mice were in a mixed background of C57BL/6 and CD-1. Although there were one third fewer G-HET or KO mice at weaning compared to WT and T-HET mice, G-HET and KO mice appeared healthy. In cultures of calvarial osteoblasts, prostaglandin E(2) (PGE(2)) increased alkaline phosphatase (ALP) activity in cells from WT mice, and this effect was significantly decreased in cells from either G-HET or T-HET mice and further decreased in cells from KO mice. A selective agonist for EP4 receptor increased ALP activity and osteocalcin mRNA levels in cells from WT but not KO mice. A selective COX-2 inhibitor, NS-398, decreased osteoblast differentiation in WT but not KO cells. At 15 to 18 months of age there were no differences in serum creatinine, calcium, PTH, body weight or bone mineral density among the different genotypes. Static and dynamic histomorphometry showed no consistent changes in bone volume or bone formation. We conclude that expression of the EP4 receptor in osteoblasts is critical for anabolic responses to PGE(2) in cell culture but may not be essential for maintenance of bone remodeling in vivo.
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Affiliation(s)
- Qi Gao
- New England Musculoskeletal Institute, University of Connecticut Health Center, Farmington, CT 06030, USA
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13
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Minamizaki T, Yoshiko Y, Kozai K, Aubin JE, Maeda N. EP2 and EP4 receptors differentially mediate MAPK pathways underlying anabolic actions of prostaglandin E2 on bone formation in rat calvaria cell cultures. Bone 2009; 44:1177-85. [PMID: 19233324 DOI: 10.1016/j.bone.2009.02.010] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2008] [Revised: 11/27/2008] [Accepted: 02/08/2009] [Indexed: 11/16/2022]
Abstract
Of the four prostaglandin (PG) E receptor subtypes (EP1-EP4), EP2 and EP4 have been proposed to mediate the anabolic action of PGE(2) on bone formation but comparative evaluation studies of EPs on bone formation do not necessarily share a common mechanism, implying that their additional features including downstream MAPK pathways may be beneficial to resolve this issue. We systematically assessed the roles of EPs in the rat calvaria (RC) cell culture model by using four selective EP agonists (EPAs). Consistent with relative expression levels of the respective receptors, multiple phenotypic traits of bone formation in vitro, including proliferation of nodule-associated cells, osteoblast marker expression and mineralized nodule formation were upregulated not only by PGE(2) but equally by EP2A and EP4A, but not by EP1A and EP3A. EP2A and EP4A were effective when cells were treated chronically or pulse-treated during nascent nodule formation. EP2A and EP4A equally stimulated the endogenous PGE(2) production, while EP2A caused a greater increase in cAMP production and c-Fos gene expression compared to EP4A. EP2A and EP4A activated predominantly p38 MAPK and ERK respectively, while c-Jun N-terminal kinase (JNK) was equally activated by both agonists. SB203580 (p38 MAPK inhibitor) blocked the PGE(2) effect on mineralized nodule formation, while U0126 (ERK inhibitor) and dicumarol (JNK inhibitor) were less effective. PGE(2)-dependent phosphorylation of the MAPKs was affected not only by protein kinase (PK)A and PKC inhibitors but also by adenylate cyclase and PKC activators. Co-treatment of RC cells with EP2A or EP4A and bone morphogenetic protein (BMP)2, whose effects on bone nodule formation is known to be, in part, mediated through the PKA and p38 MAPK pathways, resulted in an additive effect on mineralized nodule formation. Further, PGE(2), EP2A and EP4A did not increase BMP2/4 mRNA levels in RC cells, and EP2-induced phosphorylation of p38 MAPK was not eliminated by Noggin. These results suggest that, in the RC cell model, the anabolic actions of PGE(2) on mineralized nodule formation are mediated at least in part by activation of the EP2 and EP4 receptor subtype-specific MAPK pathways, independently of BMP signaling, in cells associated with nascent bone nodules.
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MESH Headings
- Animals
- Animals, Newborn
- Blotting, Western
- Cells, Cultured
- Cyclic AMP
- Dinoprostone/pharmacology
- MAP Kinase Signaling System/drug effects
- MAP Kinase Signaling System/physiology
- Osteogenesis/drug effects
- Oxytocics/pharmacology
- Rats
- Rats, Wistar
- Receptors, Prostaglandin E/agonists
- Receptors, Prostaglandin E/genetics
- Receptors, Prostaglandin E/metabolism
- Receptors, Prostaglandin E, EP2 Subtype
- Receptors, Prostaglandin E, EP4 Subtype
- Reverse Transcriptase Polymerase Chain Reaction
- Skull/cytology
- Skull/drug effects
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Affiliation(s)
- Tomoko Minamizaki
- Department of Oral Growth and Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan.
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Gao Q, Xu M, Alander CB, Choudhary S, Pilbeam CC, Raisz LG. Effects of prostaglandin E2 on bone in mice in vivo. Prostaglandins Other Lipid Mediat 2009; 89:20-5. [DOI: 10.1016/j.prostaglandins.2009.03.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2009] [Revised: 03/11/2009] [Accepted: 03/14/2009] [Indexed: 12/01/2022]
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15
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Graham S, Gamie Z, Polyzois I, Narvani AA, Tzafetta K, Tsiridis E, Heliotis M, Mantalaris A, Tsiridis E. Prostaglandin EP2 and EP4 receptor agonists in bone formation and bone healing:In vivoandin vitroevidence. Expert Opin Investig Drugs 2009; 18:746-66. [DOI: 10.1517/13543780902893051] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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