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Zhou C, Cai Z, Guo J, Li C, Qin C, Yan J, Yang D. Injective hydrogel loaded with liposomes-encapsulated MY-1 promotes wound healing and increases tensile strength by accelerating fibroblast migration via the PI3K/AKT-Rac1 signaling pathway. J Nanobiotechnology 2024; 22:396. [PMID: 38965546 PMCID: PMC11225333 DOI: 10.1186/s12951-024-02666-3] [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: 01/31/2024] [Accepted: 06/25/2024] [Indexed: 07/06/2024] Open
Abstract
Failed skin wound healing, through delayed wound healing or wound dehiscence, is a global public health issue that imposes significant burdens on individuals and society. Although the application of growth factor is an effective method to improve the pace and quality of wound healing, the clinically approved factors are limited. Parathyroid hormone (PTH) demonstrates promising results in wound healing by promoting collagen deposition and cell migration, but its application is limited by potentially inhibitory effects when administered continuously and locally. Through partially replacing and repeating the amino acid domains of PTH(1-34), we previously designed a novel PTH analog, PTH(3-34)(29-34) or MY-1, and found that it avoided the inhibitory effects of PTH while retaining its positive functions. To evaluate its role in wound healing, MY-1 was encapsulated in liposomes and incorporated into the methacryloyl gelatin (GelMA) hydrogel, through which an injectable nanocomposite hydrogel (GelMA-MY@Lipo, or GML) was developed. In vitro studies revealed that the GML had similar properties in terms of the appearance, microstructure, functional groups, swelling, and degradation capacities as the GelMA hydrogel. In vitro drug release testing showed a relatively more sustainable release of MY-1, which was still detectable in vivo 9 days post-application. When the GML was topically applied to the wound areas of rat models, wound closure as well as tensile strength were improved. Further studies showed that the effects of GML on wound repair and tensile strength were closely related to the promotion of fibroblast migration to the wound area through the controlled release of MY-1. Mechanically, MY-1 enhanced fibroblast migration by activating PI3K/AKT signaling and its downstream molecule, Rac1, by which it increased fibroblast aggregation in the early stage and resulting in denser collagen deposition at a later time. Overall, these findings demonstrated that the nanocomposite hydrogel system promoted skin wound healing and increased tensile strength, thus offering new potential in the treatment of wound healing.
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Affiliation(s)
- Chunhao Zhou
- Department of Orthopedics - Spinal Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Avenue, Guangzhou, 510515, China
| | - Zhihai Cai
- Department of Orthopedics - Spinal Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Avenue, Guangzhou, 510515, China
| | - Jialiang Guo
- Department of Orthopedics - Spinal Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Avenue, Guangzhou, 510515, China
| | - Chengfu Li
- Department of Orthopedics - Spinal Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Avenue, Guangzhou, 510515, China
| | - Chenghe Qin
- Department of Orthopedics - Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Juanwen Yan
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.
| | - Dehong Yang
- Department of Orthopedics - Spinal Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Avenue, Guangzhou, 510515, China.
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Zhou C, Guan D, Guo J, Niu S, Cai Z, Li C, Qin C, Yan W, Yang D. Human Parathyroid Hormone Analog (3-34/29-34) promotes wound re-epithelialization through inducing keratinocyte migration and epithelial-mesenchymal transition via PTHR1-PI3K/AKT activation. Cell Commun Signal 2023; 21:217. [PMID: 37612710 PMCID: PMC10464420 DOI: 10.1186/s12964-023-01243-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Accepted: 07/22/2023] [Indexed: 08/25/2023] Open
Abstract
BACKGROUND Re-epithelialization is important in the process of wound healing. Various methods have been identified to expedite the process, but their clinical application remains limited. While parathyroid hormone (PTH) has shown promising results in wound healing due to its role in promoting collagen deposition and cell migration, application is limited by its potentially inhibitive effects when being continuously and locally administrated. Herein, we developed a novel PTH analog, Human parathyroid hormone (hPTH) (3-34/29-34) (henceforth MY-1), by partially replacing and repeating the amino acid sequences of hPTH (1-34), and evaluated its effect on skin wound re-epithelialization. METHODS CCK-8, colony formation unit assay, and Ki67 immunofluorescent staining were performed to evaluate the effect of MY-1 on HaCaT cell proliferation. Then, wound scratch assay, Transwell assay and lamellipodia staining were carried out to evaluate the effect of MY-1 on cell migration. Moreover, the epithelial-mesenchymal transition (EMT) markers were measured using qPCR and western blot analysis. For in-vivo drug delivery, gelatin methacryloyl (GelMA) hydrogel was employed to load the MY-1, with the physicochemical characteristics evaluated prior to its application in wound models. Then, MY-1's role in wound healing was determined via acute skin wound models. Finally, the mechanism that MY-1 activated was also detected on HaCaT cells and in-vivo wound models. RESULTS In-vitro, MY-1 accelerated the migration and EMT of HaCaT cells, while having little effect on cell proliferation. GelMA and MY-1-incorporated GelMA hydrogels showed similar physicochemical characteristics and were used in the in-vivo studies, where the results revealed that MY-1 led to a stronger re-epithelialization by inducing basal keratinocyte migration and EMT. Further studies on in-vivo wound models and in-vitro HaCaT cells revealed that MY-1 regulated cell migration and EMT through activating PI3K/AKT signaling. The parathyroid hormone type 1 receptor (PTHR1), the main receptor of PTH, was found to be the upstream of PI3K/AKT signaling, through interfering PTHR1 expression with a small interference RNA following detection of the PI3K/AKT activation. CONCLUSION Collectively, our study demonstrated that MY-1 accelerates skin wound re-epithelialization by inducing keratinocyte migration and EMT via PTHR1-PI3K/AKT axis activation. Video Abstract.
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Affiliation(s)
- Chunhao Zhou
- Department of Orthopaedics, Nanfang Hospital, Division of Spine Surgery, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, P. R. China
| | - Donghua Guan
- Department of Orthopaedics, Nanfang Hospital, Division of Spine Surgery, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, P. R. China
- Department of Emergency, Zengcheng Branch of Nanfang Hospital, Southern Medical University, No. 28 Chuangxin Avenue Yongning Street, Guangzhou, 511340, P. R. China
| | - Jialiang Guo
- Department of Orthopaedics, Nanfang Hospital, Division of Spine Surgery, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, P. R. China
| | - Shangbo Niu
- Department of Orthopaedics, Nanfang Hospital, Division of Spine Surgery, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, P. R. China
| | - Zhihai Cai
- Department of Orthopaedics, Nanfang Hospital, Division of Spine Surgery, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, P. R. China
| | - Chengfu Li
- Department of Orthopaedics, Nanfang Hospital, Division of Spine Surgery, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, P. R. China
| | - Chenghe Qin
- Department of Orthopaedics, Nanfang Hospital, Division of Orthopaedic Trauma, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, P. R. China
| | - Wenjuan Yan
- Department of Stomatology, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, P. R. China.
| | - Dehong Yang
- Department of Orthopaedics, Nanfang Hospital, Division of Spine Surgery, Southern Medical University, 1838 North Guangzhou Ave, Guangzhou, 510515, P. R. China.
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Yanli Z, Jiayao M, Chunqing Z, Yuting Z, Zhiyan Z, Yulin Z, Minghan L, Longquan S, Dehong Y, Wenjuan Y. MY-1-Loaded Nano-Hydroxyapatite Accelerated Bone Regeneration by Increasing Type III Collagen Deposition in Early-Stage ECM via a Hsp47-Dependent Mechanism. Adv Healthc Mater 2023; 12:e2300332. [PMID: 36999955 DOI: 10.1002/adhm.202300332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/13/2023] [Indexed: 04/01/2023]
Abstract
The extracellular matrix (ECM) plays a crucial part in regulating stem cell function through its distinctive mechanical and chemical effect. Therefore, it is worth studying how to activate the driving force of osteoblast cells by dynamic changing of ECM and accelerate the bone regeneration. In this research, a novel peptide MY-1 is designed and synthesized. To achieve its sustained releasing, the nano-hydroxyapatite (nHA) is chosen as the carrier of MY-1 by mixed adsorption. The results reveal that the sustainable releasing of MY-1 regulates the synthesis and secretion of ECM from rat bone marrow mesenchymal stem cells (rBMSCs), which promotes the cell migration and osteogenic differentiation in the early stage of bone regeneration. Further analyses demonstrate that MY-1 increases the expression and nuclear translocation of β-catenin, and then upregulates the level of heat shock protein 47 (Hsp47), thereby accelerating the synthesis and secretion of type III collagen (Col III) at the early stage. Finally, the promoted rapid transformation of Col III to Col I at late stage benefits the bone regeneration. Hence, this study can provide a theoretical basis for the local application of MY-1 in bone regeneration.
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Affiliation(s)
- Zhang Yanli
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, P. R. China
| | - Mo Jiayao
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, P. R. China
| | - Zheng Chunqing
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, P. R. China
| | - Zeng Yuting
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, P. R. China
| | - Zhou Zhiyan
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, P. R. China
| | - Zhang Yulin
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, P. R. China
| | - Li Minghan
- Department of Orthopedics - Spinal Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, P. R. China
| | - Shao Longquan
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, P. R. China
| | - Yang Dehong
- Department of Orthopedics - Spinal Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, P. R. China
| | - Yan Wenjuan
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, P. R. China
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Zheng Z, Wang H, Mo J, Ling Z, Zeng Y, Zhang Y, Wang J, Yan W. Effect of virtual cement space and restorative materials on the adaptation of CAD-CAM endocrowns. BMC Oral Health 2022; 22:580. [PMID: 36494663 PMCID: PMC9733092 DOI: 10.1186/s12903-022-02598-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 11/15/2022] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND This study aimed to evaluate the effect of virtual cement space and restorative materials on the fit of computer-aided design and computer-aided manufacturing (CAD-CAM) endocrowns. METHODS A mandibular first molar tooth model received a butt joint margin endocrown preparation with a 2-mm occlusal thickness. Then, using a 3D-printing system, 120 copies of this prepared die were printed and assigned equally to three groups with different cement space settings (30, 60, and 120 μm) during the chairside CAD design. In the milling process, CAD-based models with a particular space setting were subdivided into four groups (n = 10) and fabricated from different CAD-CAM materials: Vita Suprinity (VS), Celtra Duo (CD), Lava Ultimate (LU), and Grandio blocs (GR). Finally, the endocrowns were stabilized over their corresponding models with siloxane and subjected to micro-computed tomography to measure the fit. RESULTS The cement space that was predesigned at 30 μm generated the largest marginal discrepancy (from 144.68 ± 22.43 μm to 174.36 ± 22.78 μm), which was significantly different from those at 60 μm and 120 μm (p < 0.001). The combination of VS or CD with a pre-setting cement space of 60 μm and the combination of LU or GR with a cement space of 120 μm showed better agreement between the predesigned and actual measured marginal gap widths. For internal adaptation, only the cement space set to 30 μm exceeded the clinically acceptable threshold (200 μm). CONCLUSIONS The setting of the cement space and restorative material significantly affected the marginal adaptation of CAD-CAM endocrown restorations. Considering the discrepancy between design and reality, different virtual cement spaces should be applied to ceramic and resin composite materials.
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Affiliation(s)
- Ziting Zheng
- grid.416466.70000 0004 1757 959XDepartment of Stomatology, Nanfang Hospital, Southern Medical University, 1838 N Guangzhou RD, Guangzhou, Guangdong People’s Republic of China
| | - Hebi Wang
- grid.416466.70000 0004 1757 959XDepartment of Stomatology, Nanfang Hospital, Southern Medical University, 1838 N Guangzhou RD, Guangzhou, Guangdong People’s Republic of China ,grid.411866.c0000 0000 8848 7685Department of Stomatology, The Third Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, Guangdong People’s Republic of China
| | - Jiayao Mo
- grid.416466.70000 0004 1757 959XDepartment of Stomatology, Nanfang Hospital, Southern Medical University, 1838 N Guangzhou RD, Guangzhou, Guangdong People’s Republic of China
| | - Zhiting Ling
- grid.416466.70000 0004 1757 959XDepartment of Stomatology, Nanfang Hospital, Southern Medical University, 1838 N Guangzhou RD, Guangzhou, Guangdong People’s Republic of China
| | - Yuting Zeng
- grid.416466.70000 0004 1757 959XDepartment of Stomatology, Nanfang Hospital, Southern Medical University, 1838 N Guangzhou RD, Guangzhou, Guangdong People’s Republic of China
| | - Yuxin Zhang
- grid.416466.70000 0004 1757 959XDepartment of Stomatology, Nanfang Hospital, Southern Medical University, 1838 N Guangzhou RD, Guangzhou, Guangdong People’s Republic of China
| | - Jilei Wang
- grid.416466.70000 0004 1757 959XDepartment of Stomatology, Nanfang Hospital, Southern Medical University, 1838 N Guangzhou RD, Guangzhou, Guangdong People’s Republic of China
| | - Wenjuan Yan
- grid.416466.70000 0004 1757 959XDepartment of Stomatology, Nanfang Hospital, Southern Medical University, 1838 N Guangzhou RD, Guangzhou, Guangdong People’s Republic of China
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Inactivation of Osteoblast PKC Signaling Reduces Cortical Bone Mass and Density and Aggravates Renal Osteodystrophy in Mice with Chronic Kidney Disease on High Phosphate Diet. Int J Mol Sci 2022; 23:ijms23126404. [PMID: 35742850 PMCID: PMC9223847 DOI: 10.3390/ijms23126404] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 06/01/2022] [Accepted: 06/06/2022] [Indexed: 02/05/2023] Open
Abstract
Chronic kidney disease (CKD) frequently leads to hyperphosphatemia and hyperparathyroidism, mineral bone disorder (CKD-MBD), ectopic calcifications and cardiovascular mortality. PTH activates the osteoanabolic Gαs/PKA and the Gαq/11/PKC pathways in osteoblasts, the specific impact of the latter in CKD-MBD is unknown. We generated osteoblast specific Gαq/11 knockout (KO) mice and established CKD-MBD by subtotal nephrectomy and dietary phosphate load. Bone morphology was assessed by micro-CT, osteoblast function by bone planar scintigraphy at week 10 and 22 and by histomorphometry. Osteoblasts isolated from Gαq/11 KO mice increased cAMP but not IP3 in response to PTH 1-34, demonstrating the specific KO of the PKC signaling pathway. Osteoblast specific Gαq/11 KO mice exhibited increased serum calcium and reduced bone cortical thickness and mineral density at 24 weeks. CKD Gαq/11 KO mice had similar bone morphology compared to WT, while CKD Gαq/11-KO on high phosphate diet developed decreased metaphyseal and diaphyseal cortical thickness and area, as well as a reduction in trabecular number. Gαq/11-KO increased bone scintigraphic tracer uptake at week 10 and mitigated tracer uptake in CKD mice at week 22. Histological bone parameters indicated similar trends. Gαq/11-KO in osteoblast modulates calcium homeostasis, bone formation rate, bone morphometry, and bone mineral density. In CKD and high dietary phosphate intake, osteoblast Gαq/11/PKC KO further aggravates mineral bone disease.
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Song MS, Yu X, Rong PZ, Pang QJ. The Effects of Signaling-Selective Parathyroid Hormone Analogs on Osteoporotic Osteocyte Apoptosis. J BIOMATER TISS ENG 2022. [DOI: 10.1166/jbt.2022.2904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Objectives: To compare the effects of signaling-selective parathyroid hormone analogs [G1, R19]hPTH(1–28) [GR(1–28)] and [G1, R19]hPTH(1–34) [GR(1–34)] on osteoporotic osteocyte apoptosis, and to explore the mechanism of the anti-osteoporotic difference.
Methods: The osteoporosis model was established in eighty adult female C57BL/6 mice aged 12 weeks. The mice were subcutaneously administered with GR(1–28) and GR(1–34) 5 days per week for 8 weeks. Bilateral femur samples were collected at 4 and 8 weeks, and micro-computed
tomography (CT), H&E staining and immunohistochemical staining analyses were performed. Results: From micro-CT analysis, GR(1–34) increased proximal femoral bone mineral density (BMD) and relative bone volume (BV/TV), which was higher than GR(1–28) did. In addition,
more trabecular number (Tb.N), thinner trabecular thickness (Tb.Th) and wider trabecular separation (Tb.Sp) were measured at week 8 using GR(1–34). From H&E and immunohistochemical staining, a stronger apoptosis inhibition was induced by GR(1–34) with more Bcl-2 secretion
but less Bax expression, as opposed to GR(1–28). Conclusions: GR(1–34) shows better anti-osteoporotic effects than GR(1–28), which appears to be attributed to the activation of the PLC-independent PKC signaling pathway triggered by the former, inhibiting osteocyte
apoptosis through up-regulation of Bcl-2 and down-regulation of Bax to increase bone mass and improving trabecular bone microstructure to enhance bone quality by reducing trabecular number, increasing trabecular thickness and trabecular space.
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Affiliation(s)
- Meng-Sheng Song
- Department of Orthopedics, HwaMei Hospital, University of Chinese Academy of Sciences; Ningbo Institute of Life and Health Industry, University of Chinese Academy of Sciences, Ningbo 315000, Zhejiang, China
| | - Xiao Yu
- Department of Orthopedics, HwaMei Hospital, University of Chinese Academy of Sciences; Ningbo Institute of Life and Health Industry, University of Chinese Academy of Sciences, Ningbo 315000, Zhejiang, China
| | - Peng-Ze Rong
- Ningbo University School of Medicine, Ningbo 315211, China
| | - Qing-Jiang Pang
- Department of Orthopedics, HwaMei Hospital, University of Chinese Academy of Sciences; Ningbo Institute of Life and Health Industry, University of Chinese Academy of Sciences, Ningbo 315000, Zhejiang, China
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Parathyroid hormone and its related peptides in bone metabolism. Biochem Pharmacol 2021; 192:114669. [PMID: 34224692 DOI: 10.1016/j.bcp.2021.114669] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 06/29/2021] [Accepted: 06/30/2021] [Indexed: 12/21/2022]
Abstract
Parathyroid hormone (PTH) is an 84-amino-acid peptide hormone that is secreted by the parathyroid gland. It has different administration modes in bone tissue through which it promotes bone formation (intermittent administration) and bone resorption (continuous administration) and has great potential for application in sbone defect repair. PTH regulates bone metabolism by binding to PTH1R. PTH plays an osteogenic role by acting directly on mesenchymal stem cells, cells with an osteoblastic lineage, osteocytes, and T cells. It also participates as an osteoclast by indirectly acting on osteoclast precursor cells and osteoclasts and directly acting on T cells. In these cells, PTH activates the Wnt signaling, cAMP/PKA, cAMP/PKC, and RANKL/RANK/OPG pathways and other signaling pathways. Although PTH(1-34), also known as teriparatide, has been used clinically, it still has some disadvantages. Developing improved PTH-related peptides is a potential solution to teriparatide's shortcomings. The action mechanism of these PTH-related peptides is not exactly the same as that of PTH. Thus, the mechanisms of PTH and PTH-related peptides in bone metabolism were reviewed in this paper.
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Lu W, Li X, Yang Y, Yi J, Xie L, Zhao Z, Li Y. PTH/PTHrP in controlled release hydrogel enhances orthodontic tooth movement by regulating periodontal bone remodaling. J Periodontal Res 2021; 56:885-896. [PMID: 33856055 DOI: 10.1111/jre.12885] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 03/23/2021] [Accepted: 04/02/2021] [Indexed: 02/05/2023]
Abstract
OBJECTIVE This study aimed to evaluate the effects of local application of parathyroid hormone (PTH) or parathyroid hormone-related protein (PTHrP) on osteogenesis and osteoclastogenesis during orthodontic tooth movement (OTM). BACKGROUND Periodontal bone remodeling is the crucial biological process in the OTM that involves both bone resorption and formation, with the former more important as the initiator. PTH or PTHrP both play dual roles in bone remodeling regulation, and the balance may shift to the bone resorption side when they are given continuously, suggesting them as potential candidate medicine for OTM acceleration. METHODS A total of 40 rats underwent orthodontic mesialization of the maxillary first molars and received no micro-perforation (MOP), or MOP followed by injection of temperature-sensitive hydrogel containing PTH, PTHrP, or normal saline. The rats were sacrificed after 2-week OTM, except for the relapse groups, which had one more week of observation after removal of the force appliances. The amount of tooth movement, rate of relapse after OTM, and effects on the bone remodeling were assessed through micro-computed tomography (μCT) analysis, alkaline phosphatase (ALP) assay, alizarin red staining, tartrate-resistant acid phosphatase (TRAP) staining, immunohistochemistry (IHC) analysis, Western blot (WB), and quantitative real-time polymerase chain reaction (qRT-PCR). The effects of PTHrP on the osteogenic differentiation of human periodontal ligament cells (hPDLCs) were explored in vitro. RESULTS The cumulative release of PTH or PTHrP from PECE hydrogels was beyond 75% at 14 days in a sustained manner. After the intervention in vivo, the distance of OTM in the PTH (0.78 ± 0.06 mm) or PTHrP (0.81 ± 0.04 mm) group was significantly larger than that of the MOP only (0.51 ± 0.04 mm) or the no MOP (0.46 ± 0.05 mm) group. Moreover, PTH injection significantly reduced the rate of relapse after OTM (25.7 ± 4.3%) compared to the control (69.6 ± 6.1%). μCT analysis showed decreased BV/TV, BS/BV, and Tb.N, while increased Tb.Sp of alveolar bone in the PTH or PTHrP group. There were also more TRAP-positive osteoclasts in the PTH or PTHrP group with a significantly enhanced ratio of receptor activator of nuclear factor-κB ligand (RANKL)/osteoprotegerin (OPG). The protein expressions of PTH/PTHrP type 1 receptor (PTHR1), alkaline phosphatase (ALP), osteocalcin (OCN), runt-related transcription factor 2 (RUNX2), and β-catenin were significantly increased in the PTH or PTHrP group, as well as the gene expressions of Pth1r, Bglap, and Alpl. There was no significant difference between the effects of PTH and PTHrP. Nevertheless, inhibition of PTHrP on the osteogenic differentiation of hPDLCs was detected in vitro with decreased expression of OCN, RUNX2, COL-1, and ALP. CONCLUSION Local injection of either PTH or PTHrP carried by controlled release PECE hydrogel similarly enhances OTM in rats through regulating periodontal bone remodeling, which deserves further study for potential clinical application.
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Affiliation(s)
- Wenxin Lu
- Department of Orthodontics, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Xue Li
- Department of Stomatology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, China
| | - Yan Yang
- Department of Head and Neck Surgery, Sichuan Cancer Hospital & Institute, Sichuan Cancer Center, School of Medicine, University of Electronic Science and Technology of China, Chengdu, China
| | - Jianru Yi
- Department of Orthodontics, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Liang Xie
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Zhihe Zhao
- Department of Orthodontics, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Yu Li
- Department of Orthodontics, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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Effect of teriparatide on ligamentum flavum mesenchymal stem cells isolated from patients with ossification of the posterior longitudinal ligament. J Pharmacol Sci 2020; 145:23-28. [PMID: 33357776 DOI: 10.1016/j.jphs.2020.10.003] [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: 06/02/2020] [Revised: 09/27/2020] [Accepted: 10/09/2020] [Indexed: 01/16/2023] Open
Abstract
Ossification of the posterior longitudinal ligament (OPLL) within the spinal canal sometimes leads to severe myelopathy. Teriparatide (TPD) is a recombinant human parathyroid hormone (PTH) (1-34), which promotes osteogenesis of mesenchymal stem cells (MSCs) via PTH 1 receptor (PTH1R). Although ligamentum flavum (LF)-MSCs from patients with OPLL have a high osteogenic potency, the effect of TPD on them remains unknown. In this study, we determined PTH1R expression in LF-MSCs from patients with OPLL and investigated whether TPD promotes osteogenic differentiation in them. First, LF-MSCs were isolated from patients with OPLL and cervical spondylotic myelopathy (CSM) (controls). Cultured LF-MSCs were treated with different concentrations of TPD on days 0, 7, and 14. On day 21, osteogenic gene expression was quantified. Mineralization was measured based on optical density after Alizarin Red S staining. LF-MSCs from both groups expressed PTH1R at the same level. TPD did not enhance osteogenic gene expression and mineralization in LF-MSCs from both groups. TPD did not promote the osteogenic differentiation of LF-MSCs from patients with OPLL. Thus, it may be safe for patients with OPLL. However, further confirmation of our results with in vivo studies is necessary.
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