1
|
Al-Omari FA, Kuroshima S, Uto Y, Uchida Y, Sawase T. Effect of intraoral administration of parathyroid hormone on osseous and soft tissue healing around implants in ovariectomized rat maxillae. Clin Oral Implants Res 2024; 35:305-320. [PMID: 38124678 DOI: 10.1111/clr.14227] [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: 08/09/2023] [Revised: 11/11/2023] [Accepted: 12/06/2023] [Indexed: 12/23/2023]
Abstract
OBJECTIVES Intermittent administration of parathyroid hormone (PTH) increases systemic bone mass. However, the effect of PTH on osseous and soft tissue healing around implants in osteoporosis patients remains unclear. This study aimed to investigate the effects of PTH on tissue healing around implants in ovariectomized rats and to compare systemic and intraoral administration routes. MATERIAL AND METHODS Implants were placed at the healed sites of ovariectomized rats 3 weeks after maxillary first molar extraction. Rats were randomly divided into two groups that received either daily systemic subcutaneous or local intraoral PTH administration. Maxillae were dissected to examine bone architectures with micro-computed tomography images. Histomorphometric and immunohistochemical analyses were performed to evaluate osseous and soft tissue healing around the implants. RESULTS Regardless of the administration route, PTH significantly increased bone area and the numbers of osteoblasts, osteoclasts, and osteocytes in the first and second inside and outside areas of implant threads, in addition to decreasing the number of sclerostin+ osteocytes. However, the intraoral PTH administration route was superior to the systemic route by significantly improving bone quality and promoting collagen production in the connective tissue around implants. CONCLUSIONS Parathyroid hormone administration promoted both osseous and soft tissue healing around implants, irrespective of administration route. Interestingly, intraoral administration improved the evaluated parameters more than systemic administration. Thus, the intraoral route could become a useful treatment strategy for implant treatment in osteoporosis patients.
Collapse
Affiliation(s)
- Farah A Al-Omari
- Department of Applied Prosthodontics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Shinichiro Kuroshima
- Department of Applied Prosthodontics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Yusuke Uto
- Department of Applied Prosthodontics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Yusuke Uchida
- Department of Applied Prosthodontics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Takashi Sawase
- Department of Applied Prosthodontics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| |
Collapse
|
2
|
Liu H, Liu L, Rosen CJ. PTH and the Regulation of Mesenchymal Cells within the Bone Marrow Niche. Cells 2024; 13:406. [PMID: 38474370 PMCID: PMC10930661 DOI: 10.3390/cells13050406] [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: 12/05/2023] [Revised: 02/05/2024] [Accepted: 02/20/2024] [Indexed: 03/14/2024] Open
Abstract
Parathyroid hormone (PTH) plays a pivotal role in maintaining calcium homeostasis, largely by modulating bone remodeling processes. Its effects on bone are notably dependent on the duration and frequency of exposure. Specifically, PTH can initiate both bone formation and resorption, with the outcome being influenced by the manner of PTH administration: continuous or intermittent. In continuous administration, PTH tends to promote bone resorption, possibly by regulating certain genes within bone cells. Conversely, intermittent exposure generally favors bone formation, possibly through transient gene activation. PTH's role extends to various aspects of bone cell activity. It directly influences skeletal stem cells, osteoblastic lineage cells, osteocytes, and T cells, playing a critical role in bone generation. Simultaneously, it indirectly affects osteoclast precursor cells and osteoclasts, and has a direct impact on T cells, contributing to its role in bone resorption. Despite these insights, the intricate mechanisms through which PTH acts within the bone marrow niche are not entirely understood. This article reviews the dual roles of PTH-catabolic and anabolic-on bone cells, highlighting the cellular and molecular pathways involved in these processes. The complex interplay of these factors in bone remodeling underscores the need for further investigation to fully comprehend PTH's multifaceted influence on bone health.
Collapse
Affiliation(s)
- Hanghang Liu
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China;
- Maine Medical Center, MaineHealth Institute for Research, 81 Research Drive, Scarborough, ME 04074, USA;
| | - Linyi Liu
- Maine Medical Center, MaineHealth Institute for Research, 81 Research Drive, Scarborough, ME 04074, USA;
| | - Clifford J. Rosen
- Maine Medical Center, MaineHealth Institute for Research, 81 Research Drive, Scarborough, ME 04074, USA;
| |
Collapse
|
3
|
Bone Marrow Adipose Tissue: Regulation of Osteoblastic Niche, Hematopoiesis and Hematological Malignancies. Stem Cell Rev Rep 2023:10.1007/s12015-023-10531-3. [PMID: 36930385 DOI: 10.1007/s12015-023-10531-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/10/2023] [Indexed: 03/18/2023]
Abstract
Bone marrow adipose tissue (BMAT) creates a specific microniche within multifunctional bone marrow (BM) ecosystem which imposes changes in surrounding cells and at systemic level. Moreover, BMAT contributes to spatial and temporal separation and metabolic compartmentalization of BM, thus regulating BM homeostasis and diseases. Recent findings have identified novel progenitor subsets of bone marrow adipocytes (BMAd)s recruited during the BM adipogenesis within different skeletal and hematopoietic stem cell niches. Potential of certain mesenchymal BM cells to differentiate into both osteogenic and adipogenic lineages, contributes to the complex interplay of BMAT with endosteal (osteoblastic) niche compartments as an important cellular player in bone tissue homeostasis. Targeting and ablation of BMAT cells at certain states might be an optional and promising strategy for improvement of bone health. Additionally, recent findings demonstrated spatial distribution of BMAds related to hematopoietic cells and pointed out important functional roles in the vital processes such as long-term hematopoiesis. BM adipogenesis appears to be an emergency phenomenon that follows the production of hematopoietic stem and progenitor cell niche factors, thus regulating physiological, stressed, and malignant hematopoiesis. Lipolytic and secretory activity of BMAds can influence survival and proliferation of hematopoietic cells at different maturation stages. Due to their different lipid status, constitutive and regulated BMAds are important determinants of normal and malignant hematopoietic cells. Further elucidation of cellular and molecular players involved in BMAT expansion and crosstalk with malignant cells is of paramount importance for conceiving the new therapies for improvement of BM health.
Collapse
|
4
|
Chen L, Xiong L, Yao L, Pan J, Arzola E, Zhu X, Mei L, Xiong WC. Attenuation of Alzheimer's brain pathology in 5XFAD mice by PTH 1-34, a peptide of parathyroid hormone. Alzheimers Res Ther 2023; 15:53. [PMID: 36918976 PMCID: PMC10012528 DOI: 10.1186/s13195-023-01202-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 03/06/2023] [Indexed: 03/16/2023]
Abstract
BACKGROUND Alzheimer's disease (AD) and osteoporosis are two distinct diseases but often occur in the same patient. Their relationship remains poorly understood. Studies using Tg2576 AD animal model demonstrate bone deficits, which precede the brain phenotypes by several months, arguing for the independence of bone deficits on brain degeneration and raising a question if the bone deficits contribute to the AD development. To address this question, we investigated the effects of PTH1-34, a peptide of parathyroid hormone analog and a well-recognized effective anabolic therapy drug for patients with osteoporosis, on 5XFAD animal model. METHODS 5XFAD mice, an early onset β-amyloid (Aβ)-based AD mouse model, were treated with PTH1-34 intermittently [once daily injection of hPTH1-34 (50 μg/Kg), 5 days/week, starting at 2-month old (MO) for 2-3 month]. Wild type mice (C57BL/6) were used as control. The bone phenotypes were examined by microCT and evaluated by measuring serum bone formation and resorption markers. The AD relevant brain pathology (e.g., Aβ and glial activation) and behaviors were assessed by a combination of immunohistochemical staining analysis, western blots, and behavior tests. Additionally, systemic and brain inflammation were evaluated by serum cytokine array, real-time PCR (qPCR), and RNAscope. RESULTS A reduced trabecular, but not cortical, bone mass, accompanied with a decrease in bone formation and an increase in bone resorption, was detected in 5XFAD mice at age of 5/6-month old (MO). Upon PTH1-34 treatments, not only these bone deficits but also Aβ-associated brain pathologies, including Aβ and Aβ deposition levels, dystrophic neurites, glial cell activation, and brain inflammatory cytokines, were all diminished; and the cognitive function was improved. Further studies suggest that PTH1-34 acts on not only osteoblasts in the bone but also astrocytes in the brain, suppressing astrocyte senescence and expression of inflammatory cytokines in 5XFAD mice. CONCLUSIONS These results suggest that PTH1-34 may act as a senolytic-like drug, reducing systemic and brain inflammation and improving cognitive function, and implicate PTH1-34's therapeutic potential for patients with not only osteoporosis but also AD.
Collapse
Affiliation(s)
- Li Chen
- Department of Neurosciences, School of Medicine, Case Western Reserve University, 2210 Circle Dr, Cleveland, OH, 44106, USA.,Institute of Cytology and Genetics, Northeast Normal University, Changchun, Jilin, China
| | - Lei Xiong
- Department of Neurosciences, School of Medicine, Case Western Reserve University, 2210 Circle Dr, Cleveland, OH, 44106, USA.,Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH, USA
| | - Lingling Yao
- Department of Neurosciences, School of Medicine, Case Western Reserve University, 2210 Circle Dr, Cleveland, OH, 44106, USA
| | - Jinxiu Pan
- Department of Neurosciences, School of Medicine, Case Western Reserve University, 2210 Circle Dr, Cleveland, OH, 44106, USA.,Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH, USA
| | - Emily Arzola
- Department of Neurosciences, School of Medicine, Case Western Reserve University, 2210 Circle Dr, Cleveland, OH, 44106, USA
| | - Xiaojuan Zhu
- Institute of Cytology and Genetics, Northeast Normal University, Changchun, Jilin, China
| | - Lin Mei
- Department of Neurosciences, School of Medicine, Case Western Reserve University, 2210 Circle Dr, Cleveland, OH, 44106, USA.,Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH, USA
| | - Wen-Cheng Xiong
- Department of Neurosciences, School of Medicine, Case Western Reserve University, 2210 Circle Dr, Cleveland, OH, 44106, USA. .,Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH, USA.
| |
Collapse
|
5
|
Zhu L, Zhou C, Chen S, Huang D, Jiang Y, Lan Y, Zou S, Li Y. Osteoporosis and Alveolar Bone Health in Periodontitis Niche: A Predisposing Factors-Centered Review. Cells 2022; 11:3380. [PMID: 36359775 PMCID: PMC9657655 DOI: 10.3390/cells11213380] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 10/19/2022] [Accepted: 10/19/2022] [Indexed: 11/26/2023] Open
Abstract
Periodontitis is a periodontal inflammatory condition that results from disrupted periodontal host-microbe homeostasis, manifested by the destruction of tooth-supporting structures, especially inflammatory alveolar bone loss. Osteoporosis is characterized by systemic deterioration of bone mass and microarchitecture. The roles of many systemic factors have been identified in the pathogenesis of osteoporosis, including endocrine change, metabolic disorders, health-impaired behaviors and mental stress. The prevalence rate of osteoporotic fracture is in sustained elevation in the past decades. Recent studies suggest that individuals with concomitant osteoporosis are more vulnerable to periodontal impairment. Current reviews of worse periodontal status in the context of osteoporosis are limited, mainly centering on the impacts of menopausal and diabetic osteoporosis on periodontitis. Herein, this review article makes an effort to provide a comprehensive view of the relationship between osteoporosis and periodontitis, with a focus on clarifying how those risk factors in osteoporotic populations modify the alveolar bone homeostasis in the periodontitis niche.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | - Yuyu Li
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| |
Collapse
|
6
|
Song MK, Sun HJ, Cho SW. Conditioned medium of amniotic fluid-derived stromal cells exerts a bone anabolic effect by enhancing progenitor population and angiogenesis. J Tissue Eng Regen Med 2022; 16:923-933. [PMID: 35819750 DOI: 10.1002/term.3340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 06/14/2022] [Accepted: 06/29/2022] [Indexed: 11/10/2022]
Abstract
A cell-free approach utilizing the paracrine effects of mesenchymal stromal cells is receiving attention in regenerative medicine. In the present study, we evaluated the effects of a conditioned medium of amniotic fluid-derived stromal cells (AFSC-CM) on bone metabolism. In mice, intraperitoneal injections of AFSC-CM increased bone mass and enhanced bone turnover. The precursor populations of myeloid and mesenchymal lineages, as well as endothelial cells in bone marrow, were also augmented by AFSC-CM administration. In an in vitro culture experiment, AFSC-CM increased osteoclast differentiation of bone marrow-derived macrophages, but had no significant effect on the osteogenic differentiation of preosteoblasts. However, AFSC-CM administration dramatically accelerated the migration and tube formation of endothelial cells, and a cytokine array showed that AFSC-CM contained many angiogenic factors. These results indicate that AFSC-CM exerts a bone anabolic effect by changing the bone marrow microenvironment, including angiogenesis and precursor expansion. Therefore, ameliorating marrow angiogenesis is a potential therapeutic strategy for bone regeneration, for which AFSCs can be a good cellular source.
Collapse
Affiliation(s)
- Min-Kyoung Song
- Department of Internal Medicine, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, Korea.,Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, and College of Medicine, Seoul National University, Daehak-ro, Jongno-gu, Seoul, Korea
| | - Hyun Jin Sun
- Department of Internal Medicine, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, Korea
| | - Sun Wook Cho
- Department of Internal Medicine, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, Korea.,Department of Internal Medicine, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, Seoul, Korea
| |
Collapse
|
7
|
Prediction of Rhizoma Drynariae Targets in the Treatment of Osteoarthritis Based on Network Pharmacology and Experimental Verification. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2021; 2021:5233462. [PMID: 34840589 PMCID: PMC8616695 DOI: 10.1155/2021/5233462] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 10/05/2021] [Accepted: 10/25/2021] [Indexed: 12/18/2022]
Abstract
Rhizoma Drynariae has been widely used for the treatment of osteoarthritis (OA), but its potential targets and molecular mechanisms remain to be further explored. Targets of Rhizoma Drynariae and OA were predicted by relevant databases, and a protein-protein interaction (PPI) network was constructed to identify key targets. The Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis was performed to obtain related pathways and then select significant pathways associated with OA. The OA chondrocyte model was established by inflammatory factor-induced SW1353 chondrocytes, and molecular docking was conducted to verify the above theoretical prediction. The results showed that a total of 86 Rhizoma Drynariae-OA interaction targets were identified, among which IL-6 and AKT1 were the key targets in the PPI network. Luteolin was the most critical component of Rhizoma Drynariae. KEGG results indicated that the effects of Rhizoma Drynariae on OA are associated with the PI3K/AKT, TNF, IL-17, apoptosis, and HIF-1 signaling pathway. The PI3K/AKT pathway can activate the downstream NF-κB pathway and further regulate the transcription and expression of downstream IL-6, IL-17, HIF-1α, Bax, and TNF, suggesting that the PI3K/AKT/NF-κB pathway is the critical pathway in the treatment of OA with Rhizoma Drynariae. Active components of Rhizoma Drynariae and key proteins of the PI3K/AKT/NF-κB signaling pathway were subjected to molecular docking, whose results showed that luteolin and IKK-α played a critical role. In vitro experiments indicated that both aqueous extracts of Rhizoma Drynariae (AERD) and luteolin inhibited the expression of IL-6 and HIF-1α and suppressed the activation of PI3K/AKT/NF-κB, IL-17, and TNF pathways. The measurement of mitochondrial membrane potential (Δψm) indicated that AERD and luteolin can decrease the LPS-induced early apoptotic cells. Luteolin had a more prominent inhibitory effect than AERD in the abovementioned in vitro experiments. In conclusion, the therapeutic mechanism of Rhizoma Drynariae against OA may be closely related to the inhibition of the PI3K/AKT/NF-κB pathway and downstream pathways, and luteolin plays a vital role in the treatment.
Collapse
|
8
|
Zweifler LE, Koh AJ, Daignault-Newton S, McCauley LK. Anabolic actions of PTH in murine models: two decades of insights. J Bone Miner Res 2021; 36:1979-1998. [PMID: 34101904 PMCID: PMC8596798 DOI: 10.1002/jbmr.4389] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 05/26/2021] [Accepted: 06/02/2021] [Indexed: 01/19/2023]
Abstract
Parathyroid hormone (PTH) is produced by the parathyroid glands in response to low serum calcium concentrations where it targets bones, kidneys, and indirectly, intestines. The N-terminus of PTH has been investigated for decades for its ability to stimulate bone formation when administered intermittently (iPTH) and is used clinically as an effective anabolic agent for the treatment of osteoporosis. Despite great interest in iPTH and its clinical use, the mechanisms of PTH action remain complicated and not fully defined. More than 70 gene targets in more than 90 murine models have been utilized to better understand PTH anabolic actions. Because murine studies utilized wild-type mice as positive controls, a variety of variables were analyzed to better understand the optimal conditions under which iPTH functions. The greatest responses to iPTH were in male mice, with treatment starting later than 12 weeks of age, a treatment duration lasting 5-6 weeks, and a PTH dose of 30-60 μg/kg/day. This comprehensive study also evaluated these genetic models relative to the bone formative actions with a primary focus on the trabecular compartment revealing trends in critical genes and gene families relevant for PTH anabolic actions. The summation of these data revealed the gene deletions with the greatest increase in trabecular bone volume in response to iPTH. These included PTH and 1-α-hydroxylase (Pth;1α(OH)ase, 62-fold), amphiregulin (Areg, 15.8-fold), and PTH related protein (Pthrp, 10.2-fold). The deletions with the greatest inhibition of the anabolic response include deletions of: proteoglycan 4 (Prg4, -9.7-fold), low-density lipoprotein receptor-related protein 6 (Lrp6, 1.3-fold), and low-density lipoprotein receptor-related protein 5 (Lrp5, -1.0-fold). Anabolic actions of iPTH were broadly affected via multiple and diverse genes. This data provides critical insight for future research and development, as well as application to human therapeutics. © 2021 The Authors. Journal of Bone and Mineral Research published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research (ASBMR).
Collapse
Affiliation(s)
- Laura E Zweifler
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA
| | - Amy J Koh
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA
| | | | - Laurie K McCauley
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA.,Department of Pathology, Medical School, University of Michigan, Ann Arbor, Michigan, USA
| |
Collapse
|
9
|
Zhang C, Li T, Zhou C, Huang L, Li Y, Wang H, Duan P, Zou S, Mei L. Parathyroid hormone increases alveolar bone homoeostasis during orthodontic tooth movement in rats with periodontitis via crosstalk between STAT3 and β-catenin. Int J Oral Sci 2020; 12:38. [PMID: 33380723 PMCID: PMC7773736 DOI: 10.1038/s41368-020-00104-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 11/23/2020] [Accepted: 11/26/2020] [Indexed: 02/05/2023] Open
Abstract
Periodontitis patients are at risk of alveolar bone loss during orthodontic treatment. The aim of this study was to investigate whether intermittent parathyroid hormone (1–34) treatment (iPTH) could reduce alveolar bone loss during orthodontic tooth movement (OTM) in individuals with periodontitis and the underlying mechanism. A rat model of OTM in the context of periodontitis was established and alveolar bone loss was observed. The control, iPTH and iPTH + stattic groups received injections of vehicle, PTH and vehicle, or PTH and the signal transducer and activator of transcription 3 (STAT3) inhibitor stattic, respectively. iPTH prevented alveolar bone loss by enhancing osteogenesis and suppressing bone resorption in the alveolar bone during OTM in rats with periodontitis. This effect of iPTH was along with STAT3 activation and reduced by a local injection of stattic. iPTH promoted osteoblastic differentiation and might further regulate the Wnt/β-catenin pathway in a STAT3-dependent manner. The findings of this study suggest that iPTH might reduce alveolar bone loss during OTM in rats with periodontitis through STAT3/β-catenin crosstalk.
Collapse
Affiliation(s)
- Cheng Zhang
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Tiancheng Li
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Chenchen Zhou
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Li Huang
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Yuyu Li
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Han Wang
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Peipei Duan
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
| | - Shujuan Zou
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
| | - Li Mei
- Discipline of Orthodontics, Faculty of Dentistry, Department of Oral Sciences, Sir John Walsh Research Institute, University of Otago, Otago, New Zealand
| |
Collapse
|
10
|
Hozain S, Cottrell J. CDllb+ targeted depletion of macrophages negatively affects bone fracture healing. Bone 2020; 138:115479. [PMID: 32535290 DOI: 10.1016/j.bone.2020.115479] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 06/06/2020] [Accepted: 06/09/2020] [Indexed: 01/13/2023]
Abstract
Inflammation is an important part of the fracture repair process which requires osteogenic cells to interact with innate immune cells such as macrophages. All murine macrophages express the F4/80 cell surface marker but they may be further subdivided into two main phenotypes: M1 (proinflammatory) or M2 (anti-inflammatory) based on surface marker expression and function. Macrophages polarize between these two main classes in response to inflammation while differentially regulating the healing process. Studies have shown that F4/80+ cell ablation impairs fracture healing, however, the distinct phenotypes that participate in the early healing process is unclear. We hypothesized that the M1 subtype is essential for the early steps of fracture healing and their depletion would impair fracture repair. To test this hypothesis, M1 (F4/80+/MHCII+/CD86+/CDllb+) macrophages were depleted using a saporin conjugated Mac-1 antibody (Mac1SAP) in vitro using primary macrophages and in vivo using a mouse femur fracture model. Primary macrophages isolated from mice femoral bone marrow were either left undifferentiated (+PBS), differentiated into M1 macrophages (+LPS), or differentiated to M2 macrophages (+IL-4), and then treated with either vehicle or 10 pM Mac1SAP. Samples were collected at day 2 and 5 post Mac1SAP treatment. Macrophage subtypes were identified by flow cytometry and cytokine secretion profiles were quantified using xMAP. For the in vivo model, mice were treated with Mac1SAP 24 h prior to fracture. Femur bone marrow samples were collected and analyzed by flow cytometry, xMAP, immunohistochemistry, MicroCT, and histology. The results demonstrated that Mac1SAP significantly depleted M1 macrophages both in vivo and in vitro. Mac1SAP treatment altered expression of 75% of cytokines in vitro and 30% of cytokines in vivo including IL-6, TNF-a, and IP-10. In both the in vitro and in vivo models, the M1 subtype correlated highly with cytokines G-CSF, IL-1α, IL-6, IL-10, LIX, KC, MCP-1, IP-10, MIP1α, MIP1β, RANTES, IL-9, IL-2 and TNFα. M1 depletion was also found to reduced callus properties at day 14 via microCT analysis. Overall, the data suggests that depletion of M1 macrophages by Mac1SAP treatment alters the cytokine expression profiles during early bone repair which ultimately impairs bone healing.
Collapse
Affiliation(s)
- Sarah Hozain
- Seton Hall University, South Orange, NJ 07079, United States of America
| | - Jessica Cottrell
- Seton Hall University, South Orange, NJ 07079, United States of America.
| |
Collapse
|
11
|
Robinson R, Srinivasan M, Shanmugam A, Ward A, Ganapathy V, Bloom J, Sharma A, Sharma S. Interleukin-6 trans-signaling inhibition prevents oxidative stress in a mouse model of early diabetic retinopathy. Redox Biol 2020; 34:101574. [PMID: 32422539 PMCID: PMC7231846 DOI: 10.1016/j.redox.2020.101574] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 03/09/2020] [Accepted: 05/10/2020] [Indexed: 02/07/2023] Open
Abstract
Purpose Diabetic retinopathy (DR), a microvascular complication of diabetes, is the leading cause of visual disability and blindness in diabetic patients. Chronic hyperglycemia leads to increased oxidative stress and inflammation in the retina, resulting in microvascular damage. Our recent in vitro studies have demonstrated that inhibition of interleukin-6 (IL-6) trans-signaling significantly reduces oxidative stress in retinal endothelial cells. The purpose of this study was to further explore the relationship between IL-6 trans-signaling and oxidative stress using a streptozotocin (STZ) induced mouse model of early diabetic retinopathy. Methods Diabetes was induced in eight week-old male C57BL/6J mice using STZ injections. sgp130Fc (mouse sgp130Fc protein) treatment was used for inhibition of IL-6 trans-signaling. Studies were conducted to evaluate the effects of IL-6 trans-signaling on oxidative balance at the systemic and retinal level. Results Decreased antioxidant capacity and increased oxidative stress was observed in diabetic mice, which returned to near-normal levels with sgp130Fc treatment. Similarly, superoxide levels, lipid peroxidation, and markers of oxidative DNA damage were increased in the diabetic retina, and these effects were abrogated by sgp130Fc treatment. Inhibition of IL-6 trans-signaling also restored normal expression of catalase and endothelial nitric oxide synthase in mouse retinas. Conclusions Inhibition of IL-6 trans-signaling significantly reduces diabetes-induced oxidative damage at the systemic level and in the retina. These findings provide further evidence for the role of IL-6 trans-signaling in diabetes-mediated oxidative stress. Decreased antioxidant capacity and increased oxidative stress in mice with DR. Inhibition of L-6 trans-signaling restores catalase and eNOS in the retina. Inhibition of IL-6 trans-signaling reduces retinal oxidative damage.
Collapse
Affiliation(s)
- Rebekah Robinson
- Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Mukund Srinivasan
- Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Arul Shanmugam
- Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Alexander Ward
- Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Veena Ganapathy
- Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Justin Bloom
- Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Ashok Sharma
- Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA; Culver Vision Discovery Institute, Medical College of Georgia, Augusta University, Augusta, GA, USA; Department of Population Health Sciences, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Shruti Sharma
- Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA; Culver Vision Discovery Institute, Medical College of Georgia, Augusta University, Augusta, GA, USA; Department of Ophthalmology, Medical College of Georgia, Augusta University, Augusta, GA, USA.
| |
Collapse
|
12
|
Lv Y, Bing Q, Lv Z, Xue J, Li S, Han B, Yang Q, Wang X, Zhang Z. Imidacloprid-induced liver fibrosis in quails via activation of the TGF-β1/Smad pathway. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 705:135915. [PMID: 31835194 DOI: 10.1016/j.scitotenv.2019.135915] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 11/26/2019] [Accepted: 12/01/2019] [Indexed: 06/10/2023]
Abstract
Imidacloprid (IMI) is one of the most frequently used neonicotinoid insecticide, and its potential toxicity and environmental hazards have gradually attracted people's attention. Liver fibrosis caused by long-term inflammation or oxidative stress can lead to cirrhosis and liver failure, even death. However, the mechanism of liver fibrosis induced by neonicotinoid insecticide remains unclear. This study investigates whether IMI could induce liver fibrosis in quails and a potential mechanism. Our study used a quail 90-day IMI-induced liver fibrosis model. The results showed that IMI induced histopathological lesions, oxidative stress, inflammation, fibrosis, and changes in nuclear factor-kappa B (NF-κB), nuclear factor-E2-related factor-2 (Nrf2), and transforming growth factor (TGF-β1) levels. Furthermore, IMI enhanced the expression of liver fibrosis marker proteins, including collagen I, α-smooth muscle actin (α-SMA), and fibronectin 1 (FN-1), by activating the TGF-β1/Smad signaling pathway. In conclusion, our study demonstrated that IMI exposure induces liver fibrosis via activation of the TGF-β1/Smad signaling pathway in quails.
Collapse
Affiliation(s)
- Yueying Lv
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, China; Heilongjiang Key Laboratory for Laboratory Animals and Comparative Medicine, Harbin 150030, China
| | - Qizheng Bing
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, China; Heilongjiang Key Laboratory for Laboratory Animals and Comparative Medicine, Harbin 150030, China
| | - Zhanjun Lv
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, China
| | - Jiangdong Xue
- College of Animal Science and Technology, Inner Mongolia University for Nationalities, Tongliao 028000, China
| | - Siyu Li
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, China; Heilongjiang Key Laboratory for Laboratory Animals and Comparative Medicine, Harbin 150030, China
| | - Bing Han
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, China; Heilongjiang Key Laboratory for Laboratory Animals and Comparative Medicine, Harbin 150030, China
| | - Qingyue Yang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, China; Heilongjiang Key Laboratory for Laboratory Animals and Comparative Medicine, Harbin 150030, China
| | - Xiaoqiao Wang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, China; Heilongjiang Key Laboratory for Laboratory Animals and Comparative Medicine, Harbin 150030, China
| | - Zhigang Zhang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, China; Heilongjiang Key Laboratory for Laboratory Animals and Comparative Medicine, Harbin 150030, China.
| |
Collapse
|
13
|
Liu F, Wang Z, Li W, Zhou L, Du Y, Zhang M, Wei Y. The mechanisms for the radioprotective effect of beta-d-glucan on high linear-energy-transfer carbon ion irradiated mice. Int J Biol Macromol 2019; 131:282-292. [DOI: 10.1016/j.ijbiomac.2019.03.073] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 03/09/2019] [Accepted: 03/11/2019] [Indexed: 12/15/2022]
|
14
|
Michalski MN, Seydel AL, Siismets EM, Zweifler LE, Koh AJ, Sinder BP, Aguirre JI, Atabai K, Roca H, McCauley LK. Inflammatory bone loss associated with MFG-E8 deficiency is rescued by teriparatide. FASEB J 2018; 32:3730-3741. [PMID: 29475373 DOI: 10.1096/fj.201701238r] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A prolonged increase in proinflammatory cytokines is associated with osteoporotic and autoimmune bone loss and, conversely, anti-inflammatory pathways are associated with protection against bone loss. Milk fat globule-epidermal growth factor (MFG-E)-8 is a glycoprotein that is proresolving, regulates apoptotic cell clearance, and has been linked to autoimmune disease and skeletal homeostasis. The role of MFG-E8 in the young vs. adult skeleton was determined in mice deficient in MFG-E8 (KO). In vivo, trabecular bone was similar in MFG-E8KO and wild-type (WT) mice at 6 and 16 wk, whereas 22 wk adult MFG-E8KO mice displayed significantly reduced trabecular BV/TV. The number of osteoclasts per bone surface was increased in 22-wk MFG-E8 KO vs. WT mice, and recombinant murine MFG-E8 decreased the number and size of osteoclasts in vitro. Adult MFG-E8KO spleen weight:body weight was increased compared with WT, and flow cytometric analysis showed significantly increased myeloid-derived suppressor cells (CD11bhiGR-1+) and neutrophils (CD11bhiLy6G+) in MFG-E8KO bone marrow, suggesting an inflammatory phenotype. PTH-treated MFG-E8KO mice showed a greater anabolic response (+124% BV/TV) than observed in PTH-treated WT mice (+64% BV/TV). These data give insight into the role of MFG-E8 in the adult skeleton and suggest that anabolic PTH may be a valuable therapeutic approach for autoimmune-associated skeletal disease.-Michalski, M. N., Seydel, A. L., Siismets, E. M., Zweifler, L. E., Koh, A. J., Sinder, B. P., Aguirre, J. I., Atabai, K., Roca, H., McCauley, L. K. Inflammatory bone loss associated with MFG-E8 deficiency is rescued by teriparatide.
Collapse
Affiliation(s)
- Megan N Michalski
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA
| | - Anna L Seydel
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA
| | - Erica M Siismets
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA
| | - Laura E Zweifler
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA
| | - Amy J Koh
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA
| | - Benjamin P Sinder
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA
| | - J Ignacio Aguirre
- Department of Physiological Sciences, College of Veterinary Medicine, University of Florida, Gainesville, Florida, USA
| | - Kamran Atabai
- Department of Medicine, Cardiovascular Research Institute, University of California, San Francisco, San Francisco, California, USA; and
| | - Hernan Roca
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA
| | - Laurie K McCauley
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA.,Department of Pathology, University of Michigan Medical School, University of Michigan, Ann Arbor, Michigan, USA
| |
Collapse
|
15
|
Vimort JB, Ruellas A, Prothero J, Marron JS, McCormick M, Cevidanes L, Benavides E, Paniagua B. Detection of bone loss via subchondral bone analysis. PROCEEDINGS OF SPIE--THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING 2018; 10578:105780Q. [PMID: 29769754 PMCID: PMC5950720 DOI: 10.1117/12.2293654] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
To date, there is no single sign, symptom, or test that can clearly diagnose early stages of Temporomandibular Joint Osteoarthritis (TMJ OA). However, it has been observed that changes in the bone occur in early stages of this disease, involving structural changes both in the texture and morphometry of the bone marrow and the subchondral cortical plate. In this paper we present a tool to detect and highlight subtle variations in subchondral bone structure obtained from high resolution Cone Beam Computed Tomography (hr-CBCT) in order to help with detecting early TMJ OA. The proposed tool was developed in ITK and 3DSlicer and it has been disseminated as open-source software tools. We have validated both our texture analysis and morphometry analysis biomarkers for detection of TMJ OA comparing hr-CBCT to μCT. Our initial statistical results using the multidimensional features computed with our tool indicate that it is possible to classify areas of demonstrated loss of trabecular bone in both μCT and hr-CBCT. This paper describes the first steps to alleviate the current inability of radiological changes to diagnose TMJ OA before morphological changes are too advanced by quantifying subchondral bone biomarkers. This paper indicates that texture based and morphometry based biomarkers have the potential to identify OA patients at risk for further bone destruction.
Collapse
Affiliation(s)
| | - Antonio Ruellas
- Dept. of Orthodontics and Pediatric Dentistry, University of Michigan, 1011 N University Ave, Ann Arbor, MI, USA 48109
| | - Jack Prothero
- Dept. of Statistics and Operations Research, University of North Carolina at Chapel Hill, Hanes Hall, Campus Box 3260, Chapel Hill, NC, USA 27599
| | - J S Marron
- Dept. of Statistics and Operations Research, University of North Carolina at Chapel Hill, Hanes Hall, Campus Box 3260, Chapel Hill, NC, USA 27599
| | | | - Lucia Cevidanes
- Dept. of Orthodontics and Pediatric Dentistry, University of Michigan, 1011 N University Ave, Ann Arbor, MI, USA 48109
| | - Erika Benavides
- Dept. of Orthodontics and Pediatric Dentistry, University of Michigan, 1011 N University Ave, Ann Arbor, MI, USA 48109
| | | |
Collapse
|
16
|
Yu M, D'Amelio P, Tyagi AM, Vaccaro C, Li JY, Hsu E, Buondonno I, Sassi F, Adams J, Weitzmann MN, DiPaolo R, Pacifici R. Regulatory T cells are expanded by Teriparatide treatment in humans and mediate intermittent PTH-induced bone anabolism in mice. EMBO Rep 2017; 19:156-171. [PMID: 29158349 DOI: 10.15252/embr.201744421] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 10/03/2017] [Accepted: 10/17/2017] [Indexed: 12/16/2022] Open
Abstract
Teriparatide is a bone anabolic treatment for osteoporosis, modeled in animals by intermittent PTH (iPTH) administration, but the cellular and molecular mechanisms of action of iPTH are largely unknown. Here, we show that Teriparatide and iPTH cause a ~two-threefold increase in the number of regulatory T cells (Tregs) in humans and mice. Attesting in vivo relevance, blockade of the Treg increase in mice prevents the increase in bone formation and trabecular bone volume and structure induced by iPTH Therefore, increasing the number of Tregs is a pivotal mechanism by which iPTH exerts its bone anabolic activity. Increasing Tregs pharmacologically may represent a novel bone anabolic therapy, while iPTH-induced Treg increase may find applications in inflammatory conditions and transplant medicine.
Collapse
Affiliation(s)
- Mingcan Yu
- Division of Endocrinology, Metabolism and Lipids, Department of Medicine, Emory University, Atlanta, GA, USA
| | - Patrizia D'Amelio
- Gerontology Section, Department of Medical Sciences, University of Torino, Torino, Italy
| | - Abdul Malik Tyagi
- Division of Endocrinology, Metabolism and Lipids, Department of Medicine, Emory University, Atlanta, GA, USA
| | - Chiara Vaccaro
- Division of Endocrinology, Metabolism and Lipids, Department of Medicine, Emory University, Atlanta, GA, USA
| | - Jau-Yi Li
- Division of Endocrinology, Metabolism and Lipids, Department of Medicine, Emory University, Atlanta, GA, USA
| | - Emory Hsu
- Division of Endocrinology, Metabolism and Lipids, Department of Medicine, Emory University, Atlanta, GA, USA
| | - Ilaria Buondonno
- Gerontology Section, Department of Medical Sciences, University of Torino, Torino, Italy
| | - Francesca Sassi
- Gerontology Section, Department of Medical Sciences, University of Torino, Torino, Italy
| | - Jonathan Adams
- Division of Endocrinology, Metabolism and Lipids, Department of Medicine, Emory University, Atlanta, GA, USA
| | - M Neale Weitzmann
- Division of Endocrinology, Metabolism and Lipids, Department of Medicine, Emory University, Atlanta, GA, USA.,Atlanta Department of Veterans Affairs Medical Center, Decatur, GA, USA
| | - Richard DiPaolo
- Department of Molecular Microbiology & Immunology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Roberto Pacifici
- Division of Endocrinology, Metabolism and Lipids, Department of Medicine, Emory University, Atlanta, GA, USA .,Immunology and Molecular Pathogenesis Program, Emory University, Atlanta, GA, USA
| |
Collapse
|
17
|
Carter CJ. Genetic, Transcriptome, Proteomic, and Epidemiological Evidence for Blood-Brain Barrier Disruption and Polymicrobial Brain Invasion as Determinant Factors in Alzheimer's Disease. J Alzheimers Dis Rep 2017; 1:125-157. [PMID: 30480234 PMCID: PMC6159731 DOI: 10.3233/adr-170017] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Diverse pathogens are detected in Alzheimer's disease (AD) brains. A bioinformatics survey showed that AD genome-wide association study (GWAS) genes (localized in bone marrow, immune locations and microglia) relate to multiple host/pathogen interactomes (Candida albicans, Cryptococcus neoformans, Bornavirus, Borrelia burgdorferri, cytomegalovirus, Ebola virus, HSV-1, HERV-W, HIV-1, Epstein-Barr, hepatitis C, influenza, Chlamydia pneumoniae, Porphyrymonas gingivalis, Helicobacter pylori, Toxoplasma gondii, Trypanosoma cruzi). These interactomes also relate to the AD hippocampal transcriptome and to plaque or tangle proteins. Upregulated AD hippocampal genes match those upregulated by multiple bacteria, viruses, fungi, or protozoa in immunocompetent cells. AD genes are enriched in GWAS datasets reflecting pathogen diversity, suggesting selection for pathogen resistance, as supported by the old age of AD patients, implying resistance to earlier infections. APOE4 is concentrated in regions of high parasitic burden and protects against childhood tropical infections and hepatitis C. Immune/inflammatory gain of function applies to APOE4, CR1, and TREM2 variants. AD genes are also expressed in the blood-brain barrier (BBB), which is disrupted by AD risk factors (age, alcohol, aluminum, concussion, cerebral hypoperfusion, diabetes, homocysteine, hypercholesterolemia, hypertension, obesity, pesticides, pollution, physical inactivity, sleep disruption, smoking) and by pathogens, directly or via olfactory routes to basal-forebrain BBB control centers. The BBB benefits from statins, NSAIDs, estrogen, melatonin, memantine, and the Mediterranean diet. Polymicrobial involvement is supported by upregulation of bacterial, viral, and fungal sensors/defenders in the AD brain, blood, or cerebrospinal fluid. AD serum amyloid-β autoantibodies may attenuate its antimicrobial effects favoring microbial survival and cerebral invasion leading to activation of neurodestructive immune/inflammatory processes, which may also be augmented by age-related immunosenescence. AD may thus respond to antibiotic, antifungal, or antiviral therapy.
Collapse
|
18
|
Koh AJ, Sinder BP, Entezami P, Nilsson L, McCauley LK. The skeletal impact of the chemotherapeutic agent etoposide. Osteoporos Int 2017; 28:2321-2333. [PMID: 28429052 PMCID: PMC5527337 DOI: 10.1007/s00198-017-4032-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 03/29/2017] [Indexed: 12/13/2022]
Abstract
Effects of the chemotherapeutic agent etoposide on the skeleton were determined in mice. Numbers of bone marrow cells were reduced and myeloid cells were increased. Bone volume was significantly decreased with signs of inhibition of bone formation. Etoposide after pre-treatment with zoledronic acid still reduced bone but overall bone volume was higher than with etoposide alone. INTRODUCTION Chemotherapeutics target rapidly dividing tumor cells yet also impact hematopoietic and immune cells in an off target manner. A wide array of therapies have negative side effects on the skeleton rendering patients osteopenic and prone to fracture. This study focused on the pro-apoptotic chemotherapeutic agent etoposide and its short- and long-term treatment effects in the bone marrow and skeleton. METHODS Six- to 16-week-old mice were treated with etoposide (20-25 mg/kg) or vehicle control in short-term (daily for 5-9 days) or long-term (3×/week for 17 days or 6 weeks) regimens. Bone marrow cell populations and their phagocytic/efferocytic functions were analyzed by flow cytometry. Blood cell populations were assessed by CBC analysis. Bone volume and area compartments and osteoclast numbers were measured by microCT, histomorphometry, and TRAP staining. Biomarkers of bone formation (P1NP) and resorption (TRAcP5b) were assayed from serum. Gene expression in bone marrow was assessed using qPCR. RESULTS Flow cytometric analysis of the bone marrow revealed short-term etoposide reduced overall cell numbers and B220+ cells, with increased marrow apoptotic (AnnexinV+PI-) cells, mesenchymal stem-like cells, and CD68+, CD45+, and CD11b+ monocyte/myeloid cells (as a percent of the total marrow). After 6 weeks, the CD68+, Gr1+, CD11b+, and CD45+ cell populations were still relatively increased in etoposide-treated bone marrow. Skeletal phenotyping revealed etoposide decreased bone volume, trabecular thickness, and cortical bone volume. Gene expression in the marrow for the leptin receptor and CXCL12 were reduced with short-term etoposide, and an increased ratio of RANKL/OPG mRNA was observed. In whole bone, Runx2 and osteocalcin gene expressions were reduced, and in serum, P1NP was significantly reduced with etoposide. Treatment with the antiresorptive agent zoledronic acid prior to etoposide increased bone volume and improved the etoposide-induced decrease in skeletal parameters. CONCLUSIONS These data suggest that etoposide induces apoptosis in the bone marrow and significantly reduces parameters of bone formation with rapid reduction in bone volume. Pre-treatment with an antiresorptive agent results in a preservation of bone mass. Preventive approaches to preserving the skeleton should be considered in human clinical studies.
Collapse
Affiliation(s)
- A J Koh
- Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, 48109-1078, USA
| | - B P Sinder
- Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, 48109-1078, USA
| | - P Entezami
- Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, 48109-1078, USA
| | - L Nilsson
- Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, 48109-1078, USA
| | - L K McCauley
- Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, 48109-1078, USA.
- Department of Pathology, School of Medicine, University of Michigan, Ann Arbor, MI, 48109, USA.
- School of Dentistry, University of Michigan, 1011 N. University Ave., Ann Arbor, MI, 48109-1078, USA.
| |
Collapse
|
19
|
Dong PY, Huang LF, Sun HY. [Research progress of bone marrow microenvironment abnormalities in myelodysplastic syndrome]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 2017; 38:643-646. [PMID: 28810341 DOI: 10.3760/cma.j.issn.0253-2727.2017.07.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
| | | | - H Y Sun
- Department of Hematology, Tongji Hospital, Tongji Medical Collega, Huazhong University of Science Technology, Wuhan 430030, China
| |
Collapse
|
20
|
Sabbieti MG, Marchetti L, Censi R, Lacava G, Agas D. Role of PTH in Bone Marrow Niche and HSC Regulation. CURRENT STEM CELL REPORTS 2017. [DOI: 10.1007/s40778-017-0091-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
21
|
[Research progress of bone marrow microenvironment abnormalities in myelodysplastic syndrome]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 2017; 34:643-6. [PMID: 28810341 PMCID: PMC7342279 DOI: 10.3760/cma.j.issn.0253-2727.2013.07.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
22
|
Abstract
Bone is in a constant state of remodeling, a process which was once attributed solely to osteoblasts and osteoclasts. Decades of research has identified many other populations of cells in the bone that participate and mediate skeletal homeostasis. Recently, osteal macrophages emerged as vital participants in skeletal remodeling and osseous repair. The exact mechanistic roles of these tissue-resident macrophages are currently under investigation. Macrophages are highly plastic in response to their micro-environment and are typically classified as being pro- or anti-inflammatory (pro-resolving) in nature. Given that inflammatory states result in decreased bone mass, proinflammatory macrophages may be negative regulators of bone turnover. Pro-resolving macrophages have been shown to release anabolic factors and may present a target for therapeutic intervention in inflammation-induced bone loss and fracture healing. The process of apoptotic cell clearance, termed efferocytosis, is mediated by pro-resolving macrophages and may contribute to steady-state bone turnover as well as fracture healing and anabolic effects of osteoporosis therapies. Parathyroid hormone is an anabolic agent in bone that is more effective in the presence of mature phagocytic macrophages, further supporting the hypothesis that efferocytic macrophages are positive contributors to bone turnover. Therapies which alter macrophage plasticity in tissues other than bone should be explored for their potential to treat bone loss either alone or in conjunction with current bone therapeutics. A better understanding of the exact mechanisms by which macrophages mediate bone homeostasis will lead to an expansion of pharmacologic targets for the treatment of osteoporosis and inflammation-induced bone loss.
Collapse
Affiliation(s)
- Megan N Michalski
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI 48109, United States
| | - Laurie K McCauley
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI 48109, United States; Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109, United States.
| |
Collapse
|
23
|
Dang M, Koh AJ, Danciu T, McCauley LK, Ma PX. Preprogrammed Long-Term Systemic Pulsatile Delivery of Parathyroid Hormone to Strengthen Bone. Adv Healthc Mater 2017; 6:10.1002/adhm.201600901. [PMID: 27930873 PMCID: PMC5299037 DOI: 10.1002/adhm.201600901] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 11/01/2016] [Indexed: 12/21/2022]
Abstract
Parathyroid hormone (PTH) is the only US Food and Drug Administration (FDA)-approved anabolic agent for the treatment of osteoporosis. The anabolic action of PTH depends on the mode of PTH administration. Pulsatile administration promotes bone formation, however continuous PTH exposure results in bone resorption. In addition, the therapeutic effect of PTH is optimal when the dose and duration fit the therapeutic window. Current PTH treatment requires daily injection, which is neither a convenient nor a favorable choice of patients. Here, an implantable and biodegradable device capable of long-term pulsatile delivery of PTH is developed as a patient-friendly alternative. The advanced materials and fabrication techniques developed in this work enable us to preprogram a pulsatile delivery device to systemically deliver 21 daily pulses of PTH that build bone in vivo. In addition, the device is biodegradable and absorbable in vivo so that no retraction procedure is needed. Therefore, this implantable and biodegradable pulsatile device holds promise to promote bone growth and treat various conditions of bone loss without the burden of daily injections or secondary surgeries.
Collapse
Affiliation(s)
- Ming Dang
- Macromolecular Science and Engineering Center, University of Michigan, Ann Arbor, MI 48109, USA
| | - Amy J. Koh
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI 48109, USA
| | - Theodora Danciu
- Department of Periodontics & Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI 48109, USA
| | - Laurie K. McCauley
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI 48109, USA
- Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Peter X. Ma
- Macromolecular Science and Engineering Center, University of Michigan, Ann Arbor, MI 48109, USA
| |
Collapse
|
24
|
Rossnagl S, Altrock E, Sens C, Kraft S, Rau K, Milsom MD, Giese T, Samstag Y, Nakchbandi IA. EDA-Fibronectin Originating from Osteoblasts Inhibits the Immune Response against Cancer. PLoS Biol 2016; 14:e1002562. [PMID: 27653627 PMCID: PMC5031442 DOI: 10.1371/journal.pbio.1002562] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 08/25/2016] [Indexed: 01/29/2023] Open
Abstract
Osteoblasts lining the inner surface of bone support hematopoietic stem cell differentiation by virtue of proximity to the bone marrow. The osteoblasts also modify their own differentiation by producing various isoforms of fibronectin (FN). Despite evidence for immune regulation by osteoblasts, there is limited knowledge of how osteoblasts modulate cells of the immune system. Here, we show that extra domain A (EDA)-FN produced by osteoblasts increases arginase production in myeloid-derived cells, and we identify α5β1 as the mediating receptor. In different mouse models of cancer, osteoblasts or EDA-FN was found to up-regulate arginase-1 expression in myeloid-derived cells, resulting in increased cancer growth. This harmful effect can be reduced by interfering with the integrin α5β1 receptor or inhibiting arginase. Conversely, in tissue injury, the expression of arginase-1 is normally beneficial as it dampens the immune response to allow wound healing. We show that EDA-FN protects against excessive fibrotic tissue formation in a liver fibrosis model. Our results establish an immune regulatory function for EDA-FN originating from the osteoblasts and identify new avenues for enhancing the immune reaction against cancer. Osteoblasts produce an isoform of fibronectin (EDA-fibronectin) that acts on myeloid cells to increase arginase-1 expression and protect against fibrosis. However, it can also enhance cancer growth; interfering with the interaction between EDA-fibronectin and its receptor diminishes this effect. Osteoblasts, which are the cells that produce bone, line the inner surface of the bone and are adjacent to the marrow that generates all the different blood cells. Osteoblasts have a close relationship with hematopoiesis, and it has been shown that a transient elimination of osteoblasts leads to the decrease of hematopoietic stem cells and progenitor cells. Fibronectin (FN) is an extracellular matrix protein with a known role in hematopoiesis in vitro that is secreted by osteoblasts. Here, we analyze the role of FN in hematopoiesis and find that an isoform that contains the extra domain A (EDA) and is produced by the osteoblasts affects both the number and future behavior of a subset of immune cells. EDA-FN protects against excessive fibrotic tissue formation in a liver fibrosis model. The same process, however, is detrimental in cancer, because it prevents the organism from mounting a potent immune response against the cancer and induces an increase of cancer growth. Mechanistically, we find that the EDA domain binds to the cell surface receptor α5β1 integrin and enhances the production of the anti-inflammatory and immunosuppressive factor arginase-1. We conclude that EDA-FN production by osteoblasts modulates immune cell behavior, and that interfering with this mechanism opens up new possibilities for enhancing an immune reaction against cancer.
Collapse
Affiliation(s)
- Stephanie Rossnagl
- Max-Planck Institute of Biochemistry, Martinsried, Germany
- Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Eva Altrock
- Max-Planck Institute of Biochemistry, Martinsried, Germany
- Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Carla Sens
- Max-Planck Institute of Biochemistry, Martinsried, Germany
- Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Sabrina Kraft
- Max-Planck Institute of Biochemistry, Martinsried, Germany
- Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Katrin Rau
- Max-Planck Institute of Biochemistry, Martinsried, Germany
- Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Michael D. Milsom
- German Cancer Research Center (DKFZ), Division of Stem Cells and Cancer, Experimental Hematology Group, and Heidelberg Institute for Stem Cell Technology and Experimental Medicine, gGmbH (HI-STEM), Heidelberg, Germany
| | - Thomas Giese
- Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Yvonne Samstag
- Institute of Immunology, University of Heidelberg, Heidelberg, Germany
| | - Inaam A. Nakchbandi
- Max-Planck Institute of Biochemistry, Martinsried, Germany
- Institute of Immunology, University of Heidelberg, Heidelberg, Germany
- * E-mail:
| |
Collapse
|
25
|
Pacifici R. The Role of IL-17 and TH17 Cells in the Bone Catabolic Activity of PTH. Front Immunol 2016; 7:57. [PMID: 26925062 PMCID: PMC4756106 DOI: 10.3389/fimmu.2016.00057] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 02/05/2016] [Indexed: 12/22/2022] Open
Abstract
Osteoimmunology is field of research dedicated to the study of the interactions between the immune system and bone. Among the cells of the immune system that regulate the skeleton in health and disease are T lymphocytes, T cells secrete inflammatory/osteoclastogenic cytokines such as RANKL, TNF, and IL-17, as well as factors that stimulate bone formation, including Wnt ligands. In addition, T cells regulate the differentiation and life span of stromal cells via CD40L and other costimulatory molecules expressed on their surface. Consensus exists that parathyroid hormone (PTH) induces bone loss by increasing the production of RANKL by osteocytes and osteoblast. However, new evidence suggests that PTH expands Th17 cells and increases IL-17 levels in mice and humans. Studies in the mouse of further shown that Th17 cell produced IL-17 acts as an “upstream cytokine” that increases the sensitivity of osteoblasts and osteocytes to PTH. As a result, PTH stimulates osteocytic and osteoblastic release of RANKL. Therefore, PTH cause bone loss only in the presence of IL-17 signaling. This article reviews the evidence that the effects of PTH are mediated not only by osteoblasts and osteocytes, but also T cells and IL-17.
Collapse
Affiliation(s)
- Roberto Pacifici
- Division of Endocrinology, Metabolism and Lipids, Department of Medicine, Emory University, Atlanta, GA, USA; Immunology and Molecular Pathogenesis Program, Emory University, Atlanta, GA, USA
| |
Collapse
|
26
|
Pacifici R. T cells, osteoblasts, and osteocytes: interacting lineages key for the bone anabolic and catabolic activities of parathyroid hormone. Ann N Y Acad Sci 2015; 1364:11-24. [PMID: 26662934 DOI: 10.1111/nyas.12969] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Osteoimmunology is a field of research dedicated to the study of the interactions between the immune system and bone. Among the cells of the immune system that regulate bone turnover and the responsiveness of bone cells to calciothropic hormones are bone marrow T lymphocytes. T cells secrete osteoclastogenic cytokines such as RANKL and TNF-α, as well as factors that stimulate bone formation, one of which is Wnt10b. In addition, T cells regulate the differentiation and life span of stromal cells (SCs) and their responsiveness to parathyroid hormone (PTH) via costimulatory molecules expressed on their surface. The conditioning effect of T cells on SCs is inherited by the osteoblastic and osteocytic progeny of SCs. As a result, osteoblastic cells of T cell-deficient mice have functional characteristics different from corresponding cells of T cell-replete mice. These differences include the ratio of RANKL/OPG produced in response to continuous PTH treatment, and the osteoblastogenic response to intermittent PTH treatment. This article reviews the evidence indicating that the effects of PTH are mediated not only by osteoblasts and osteocytes but also by T cells.
Collapse
Affiliation(s)
- Roberto Pacifici
- Division of Endocrinology, Metabolism and Lipids, Department of Medicine, and Immunology and Molecular Pathogenesis Program, Emory University, Atlanta, Georgia
| |
Collapse
|
27
|
Sinder BP, Pettit AR, McCauley LK. Macrophages: Their Emerging Roles in Bone. J Bone Miner Res 2015; 30:2140-9. [PMID: 26531055 PMCID: PMC4876707 DOI: 10.1002/jbmr.2735] [Citation(s) in RCA: 202] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 10/30/2015] [Accepted: 11/03/2015] [Indexed: 12/14/2022]
Abstract
Macrophages are present in nearly all tissues and are critical for development, homeostasis, and regeneration. Resident tissue macrophages of bone, termed osteal macrophages, are recently classified myeloid cells that are distinct from osteoclasts. Osteal macrophages are located immediately adjacent to osteoblasts, regulate bone formation, and play diverse roles in skeletal homeostasis. Genetic or pharmacological modulation of macrophages in vivo results in significant bone phenotypes, and these phenotypes depend on which macrophage subsets are altered. Macrophages are also key mediators of osseous wound healing and fracture repair, with distinct roles at various stages of the repair process. A central function of macrophages is their phagocytic ability. Each day, billions of cells die in the body and efferocytosis (phagocytosis of apoptotic cells) is a critical process in both clearing dead cells and recruitment of replacement progenitor cells to maintain homeostasis. Recent data suggest a role for efferocytosis in bone biology and these new mechanisms are outlined. Finally, although macrophages have an established role in primary tumors, emerging evidence suggests that macrophages in bone support cancers which preferentially metastasize to the skeleton. Collectively, this developing area of osteoimmunology raises new questions and promises to provide novel insights into pathophysiologic conditions as well as therapeutic and regenerative approaches vital for skeletal health.
Collapse
Affiliation(s)
- Benjamin P Sinder
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - Allison R Pettit
- Blood and Bone Diseases Program, Mater Research Institute–The University of Queensland, Translational Research Institute, Woolloongabba, Australia
| | - Laurie K McCauley
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
- Department of Pathology, University of Michigan, Medical School, Ann Arbor, MI, USA
| |
Collapse
|
28
|
Chang J, Koh AJ, Roca H, McCauley LK. Juxtacrine interaction of macrophages and bone marrow stromal cells induce interleukin-6 signals and promote cell migration. Bone Res 2015; 3:15014. [PMID: 26558138 PMCID: PMC4637844 DOI: 10.1038/boneres.2015.14] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 04/22/2015] [Accepted: 04/23/2015] [Indexed: 01/08/2023] Open
Abstract
The bone marrow contains a heterogeneous milieu of cells, including macrophages, which are key cellular mediators for resolving infection and inflammation. Macrophages are most well known for their ability to phagocytose foreign bodies or apoptotic cells to maintain homeostasis; however, little is known about their function in the bone microenvironment. In the current study, we investigated the in vitro interaction of murine macrophages and bone marrow stromal cells (BMSCs), with focus on the juxtacrine induction of IL-6 signaling and the resultant effect on BMSC migration and growth. The juxtacrine interaction of primary mouse macrophages and BMSCs activated IL-6 signaling in the co-cultures, which subsequently enhanced BMSC migration and increased BMSC numbers. BMSCs and macrophages harvested from IL-6 knockout mice revealed that IL-6 signaling was essential for enhancement of BMSC migration and increased BMSC numbers via juxtacrine interactions. BMSCs were the main contributor of IL-6 signaling, and hence activation of the IL-6/gp130/STAT3 pathway. Meanwhile, macrophage derived IL-6 remained important for the overall production of IL-6 protein in the co-cultures. Taken together, these findings show the function of macrophages as co-inducers of migration and growth of BMSCs, which could directly influence bone formation and turnover.
Collapse
Affiliation(s)
- Jia Chang
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry , Ann Arbor, MI 48109, USA ; Department of Periodontology, University of Florida College of Dentistry , Gainesville, FL 32610, USA
| | - Amy J Koh
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry , Ann Arbor, MI 48109, USA
| | - Hernan Roca
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry , Ann Arbor, MI 48109, USA
| | - Laurie K McCauley
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry , Ann Arbor, MI 48109, USA ; Department of Pathology, University of Michigan Medical School , Ann Arbor, MI 48109, USA
| |
Collapse
|
29
|
Roca H, McCauley LK. Inflammation and skeletal metastasis. BONEKEY REPORTS 2015; 4:706. [PMID: 26131358 DOI: 10.1038/bonekey.2015.75] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Accepted: 04/24/2015] [Indexed: 02/07/2023]
Abstract
On the road to metastasis a cancer cell has to overcome two major obstacles: the physical escape from the primary tumor to a distant tissue and the adaptation to the new microenvironment via colonization and the formation of a secondary tumor. Accumulated scientific findings support the hypothesis that inflammation is a critical component of the tumor microenvironment and develops as a result of tumor-induced recruitment of inflammatory cells and their reciprocal interaction with other cells from the tumor network. These interactions modulate immune responses to suppress antitumor immunity and activate feedback amplification signaling loops that link nearly all the cells in the cancer inflammatory milieu. The coordinated regulation of cytokines/chemokines, receptors and other inflammatory mediators enables the different steps of the metastatic cascade. As a target organ for colonization, the bone is rich in inflammatory mediators that are critical for successful cancer growth. In this review, we focus on the inflammatory cells, molecules and mechanisms that facilitate the expansion of cancer cells from the primary tumor to their new 'home' in the skeleton.
Collapse
Affiliation(s)
- Hernan Roca
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry , Ann Arbor, MI, USA
| | - Laurie K McCauley
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry , Ann Arbor, MI, USA ; Department of Pathology, University of Michigan Medical School , Ann Arbor, MI, USA
| |
Collapse
|
30
|
Bulycheva E, Rauner M, Medyouf H, Theurl I, Bornhäuser M, Hofbauer LC, Platzbecker U. Myelodysplasia is in the niche: novel concepts and emerging therapies. Leukemia 2014; 29:259-68. [PMID: 25394715 PMCID: PMC4320287 DOI: 10.1038/leu.2014.325] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 09/25/2014] [Indexed: 12/28/2022]
Abstract
Myelodysplastic syndromes (MDSs) represent clonal disorders mainly of the elderly that are characterized by ineffective hematopoiesis and an increased risk of transformation into acute myeloid leukemia. The pathogenesis of MDS is thought to evolve from accumulation and selection of specific genetic or epigenetic events. Emerging evidence indicates that MDS is not solely a hematopoietic disease but rather affects the entire bone marrow microenvironment, including bone metabolism. Many of these cells, in particular mesenchymal stem and progenitor cells (MSPCs) and osteoblasts, express a number of adhesion molecules and secreted factors that regulate blood regeneration throughout life by contributing to hematopoietic stem and progenitor cell (HSPC) maintenance, self-renewal and differentiation. Several endocrine factors, such as erythropoietin, parathyroid hormone and estrogens, as well as deranged iron metabolism modulate these processes. Thus, interactions between MSPC and HSPC contribute to the pathogenesis of MDS and associated pathologies. A detailed understanding of these mechanisms may help to define novel targets for diagnosis and possibly therapy. In this review, we will discuss the scientific rationale of ‘osteohematology' as an emerging research field in MDS and outline clinical implications.
Collapse
Affiliation(s)
- E Bulycheva
- Medizinische Klinik und Poliklinik I, Universitätsklinikum Carl-Gustav-Carus, Technische Universität, Dresden, Germany
| | - M Rauner
- Medizinische Klinik und Poliklinik III, Universitätsklinikum Carl-Gustav-Carus, Technische Universität, Dresden, Germany
| | - H Medyouf
- Georg-Speyer-Haus, Institut for Tumor Biology and Experimental Therapy, 60596, Frankfurt am Main, Germany
| | - I Theurl
- Department of Internal Medicine VI, Medical University of Innsbruck, Innsbruck, Austria
| | - M Bornhäuser
- 1] Medizinische Klinik und Poliklinik I, Universitätsklinikum Carl-Gustav-Carus, Technische Universität, Dresden, Germany [2] Center for Regenerative Therapies Dresden, Technical University, Dresden, Germany
| | - L C Hofbauer
- 1] Medizinische Klinik und Poliklinik III, Universitätsklinikum Carl-Gustav-Carus, Technische Universität, Dresden, Germany [2] Center for Regenerative Therapies Dresden, Technical University, Dresden, Germany
| | - U Platzbecker
- Medizinische Klinik und Poliklinik I, Universitätsklinikum Carl-Gustav-Carus, Technische Universität, Dresden, Germany
| |
Collapse
|
31
|
Soki FN, Koh AJ, Jones JD, Kim YW, Dai J, Keller ET, Pienta KJ, Atabai K, Roca H, McCauley LK. Polarization of prostate cancer-associated macrophages is induced by milk fat globule-EGF factor 8 (MFG-E8)-mediated efferocytosis. J Biol Chem 2014; 289:24560-72. [PMID: 25006249 DOI: 10.1074/jbc.m114.571620] [Citation(s) in RCA: 133] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Tumor cells secrete factors that modulate macrophage activation and polarization into M2 type tumor-associated macrophages, which promote tumor growth, progression, and metastasis. The mechanisms that mediate this polarization are not clear. Macrophages are phagocytic cells that participate in the clearance of apoptotic cells, a process known as efferocytosis. Milk fat globule- EGF factor 8 (MFG-E8) is a bridge protein that facilitates efferocytosis and is associated with suppression of proinflammatory responses. This study investigated the hypothesis that MFG-E8-mediated efferocytosis promotes M2 polarization. Tissue and serum exosomes from prostate cancer patients presented higher levels of MFG-E8 compared with controls, a novel finding in human prostate cancer. Coculture of macrophages with apoptotic cancer cells increased efferocytosis, elevated MFG-E8 protein expression levels, and induced macrophage polarization into an alternatively activated M2 phenotype. Administration of antibody against MFG-E8 significantly attenuated the increase in M2 polarization. Inhibition of STAT3 phosphorylation using the inhibitor Stattic decreased efferocytosis and M2 macrophage polarization in vitro, with a correlating increase in SOCS3 protein expression. Moreover, MFG-E8 knockdown tumor cells cultured with wild-type or MFG-E8-deficient macrophages resulted in increased SOCS3 expression with decreased STAT3 activation. This suggests that SOCS3 and phospho-STAT3 act in an inversely dependent manner when stimulated by MFG-E8 and efferocytosis. These results uncover a unique role of efferocytosis via MFG-E8 as a mechanism for macrophage polarization into tumor-promoting M2 cells.
Collapse
Affiliation(s)
- Fabiana N Soki
- From the Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan 48109
| | - Amy J Koh
- From the Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan 48109
| | - Jacqueline D Jones
- From the Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan 48109
| | - Yeo Won Kim
- From the Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan 48109
| | - Jinlu Dai
- the Department of Urology, Department of Pathology, University of Michigan Medical School, Ann Arbor, Michigan 48109
| | - Evan T Keller
- the Department of Urology, Department of Pathology, University of Michigan Medical School, Ann Arbor, Michigan 48109
| | - Kenneth J Pienta
- the James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, and
| | - Kamran Atabai
- the Department of Medicine and Cardiovascular Research Institute, University of California, San Francisco, California 94158
| | - Hernan Roca
- From the Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan 48109
| | - Laurie K McCauley
- From the Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, Michigan 48109, Department of Pathology, University of Michigan Medical School, Ann Arbor, Michigan 48109,
| |
Collapse
|
32
|
McCauley LK, Dalli J, Koh AJ, Chiang N, Serhan CN. Cutting edge: Parathyroid hormone facilitates macrophage efferocytosis in bone marrow via proresolving mediators resolvin D1 and resolvin D2. THE JOURNAL OF IMMUNOLOGY 2014; 193:26-9. [PMID: 24890726 DOI: 10.4049/jimmunol.1301945] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Bone marrow macrophages stimulate skeletal wound repair and osteoblastic bone formation by poorly defined mechanisms. Specialized proresolving mediators of inflammation drive macrophage efferocytosis (phagocytosis of apoptotic cells) and resolution, but little is known regarding this process in the bone marrow. In this study, metabololipidomic profiling via liquid chromatography mass spectrometry revealed higher levels of specialized proresolving mediators in the bone marrow relative to the spleen. The endocrine and bone anabolic agent parathyroid hormone increased specialized proresolving mediator levels, including resolvins (Rvs), in bone marrow. Human and murine primary macrophages efferocytosed apoptotic osteoblasts in vitro, and RvD1 and RvD2 (10 pM-10 nM) enhanced this process. These findings support a unique profile of specialized lipid mediators in bone marrow that contribute to a feedback system for resolution of inflammation and maintenance of skeletal homeostasis.
Collapse
Affiliation(s)
- Laurie K McCauley
- School of Dentistry, University of Michigan, Ann Arbor, MI 48109; Department of Pathology, Medical School, University of Michigan, Ann Arbor, MI 48109; and
| | - Jesmond Dalli
- Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital, Harvard Institutes of Medicine, Boston, MA 02115
| | - Amy J Koh
- School of Dentistry, University of Michigan, Ann Arbor, MI 48109
| | - Nan Chiang
- Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital, Harvard Institutes of Medicine, Boston, MA 02115
| | - Charles N Serhan
- Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital, Harvard Institutes of Medicine, Boston, MA 02115
| |
Collapse
|
33
|
Osteal macrophages support physiologic skeletal remodeling and anabolic actions of parathyroid hormone in bone. Proc Natl Acad Sci U S A 2014; 111:1545-50. [PMID: 24406853 DOI: 10.1073/pnas.1315153111] [Citation(s) in RCA: 136] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Cellular subpopulations in the bone marrow play distinct and unexplored functions in skeletal homeostasis. This study delineated a unique role of osteal macrophages in bone and parathyroid hormone (PTH)-dependent bone anabolism using murine models of targeted myeloid-lineage cell ablation. Depletion of c-fms(+) myeloid lineage cells [via administration of AP20187 in the macrophage Fas-induced apoptosis (MAFIA) mouse model] reduced cortical and trabecular bone mass and attenuated PTH-induced trabecular bone anabolism, supporting the positive function of macrophages in bone homeostasis. Interestingly, using a clodronate liposome model with targeted depletion of mature phagocytic macrophages an opposite effect was found with increased trabecular bone mass and increased PTH-induced anabolism. Apoptotic cells were more numerous in MAFIA versus clodronate-treated mice and flow cytometric analyses of myeloid lineage cells in the bone marrow showed that MAFIA mice had reduced CD68(+) cells, whereas clodronate liposome-treated mice had increased CD68(+) and CD163(+) cells. Clodronate liposomes increased efferocytosis (clearance of apoptotic cells) and gene expression associated with alternatively activated M2 macrophages as well as expression of genes associated with bone formation including Wnt3a, Wnt10b, and Tgfb1. Taken together, depletion of early lineage macrophages resulted in osteopenia with blunted effects of PTH anabolic actions, whereas depletion of differentiated macrophages promoted apoptotic cell clearance and transformed the bone marrow to an osteogenic environment with enhanced PTH anabolism. These data highlight a unique function for osteal macrophages in skeletal homeostasis.
Collapse
|
34
|
Abstract
PURPOSE OF REVIEW Dipeptidyl peptidase 4 (DPP4, CD26) is a protease that cleaves selected amino acids at the N-terminal penultimate position and has the potential to alter the protein function. The regulation and roles of DPP4 activity are not well understood; therefore, the purpose of this review is to discuss the recent literature regarding DPP4 regulation, as well as the variety of molecules it may affect, and their potential clinical applications. RECENT FINDINGS Recent insight into the number of proteins that have DPP4 sites, and how DPP4 truncation may alter hematopoiesis based on the protein full length vs. truncated state, has shown that DPP4 truncation of colony-stimulating factors (CSFs) alters their function and that the activity of these CSFs can be enhanced when DPP4 activity is inhibited. DPP4 inhibition has recently been used in a clinical trial to attempt to enhance the engraftment of cord blood cells, and an endogenous DPP4 inhibitor tissue factor pathway inhibitor has been discovered, increasing our understanding of the potential importance of DPP4. SUMMARY DPP4 plays a role in regulating the activity of CSFs and other cytokines involved in hematopoiesis. This information may be useful for enhancing hematopoietic cell transplantation, blood cell recovery after stress, and for understanding the physiology and pathophysiology of blood and other cell systems.
Collapse
|
35
|
Park SI, Lee C, Sadler WD, Koh AJ, Jones J, Seo JW, Soki FN, Cho SW, Daignault SD, McCauley LK. Parathyroid hormone-related protein drives a CD11b+Gr1+ cell-mediated positive feedback loop to support prostate cancer growth. Cancer Res 2013; 73:6574-83. [PMID: 24072746 DOI: 10.1158/0008-5472.can-12-4692] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In the tumor microenvironment, CD11b(+)Gr1(+) bone marrow-derived cells are a predominant source of protumorigenic factors such as matrix metalloproteinases (MMP), but how distal tumors regulate these cells in the bone marrow is unclear. Here we addressed the hypothesis that the parathyroid hormone-related protein (PTHrP) potentiates CD11b(+)Gr1(+) cells in the bone marrow of prostate tumor hosts. In two xenograft models of prostate cancer, levels of tumor-derived PTHrP correlated with CD11b(+)Gr1(+) cell recruitment and microvessel density in the tumor tissue, with evidence for mediation of CD11b(+)Gr1(+) cell-derived MMP-9 but not tumor-derived VEGF-A. CD11b(+)Gr1(+) cells isolated from mice with PTHrP-overexpressing tumors exhibited relatively increased proangiogenic potential, suggesting that prostate tumor-derived PTHrP potentiates this activity of CD11b(+)Gr1(+) cells. Administration of neutralizing PTHrP monoclonal antibody reduced CD11b(+)Gr1(+) cells and MMP-9 in the tumors. Mechanistic investigations in vivo revealed that PTHrP elevated Y418 phosphorylation levels in Src family kinases in CD11b(+)Gr1(+) cells via osteoblast-derived interleukin-6 and VEGF-A, thereby upregulating MMP-9. Taken together, our results showed that prostate cancer-derived PTHrP acts in the bone marrow to potentiate CD11b(+)Gr1(+) cells, which are recruited to tumor tissue where they contribute to tumor angiogenesis and growth.
Collapse
Affiliation(s)
- Serk In Park
- Authors' Affiliations: Departments of Medicine and Cancer Biology; Center for Bone Biology; Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, Tennessee; Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry; Comprehensive Cancer Center Biostatistics Core; and Department of Pathology, University of Michigan Medical School, Ann Arbor, Michigan
| | | | | | | | | | | | | | | | | | | |
Collapse
|