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Azevedo MDCS, Fonseca AC, Colavite PM, Melchiades JL, Tabanez AP, Codo AC, de Medeiros AI, Trombone APF, Garlet GP. Macrophage Polarization and Alveolar Bone Healing Outcome: Despite a Significant M2 Polarizing Effect, VIP and PACAP Treatments Present a Minor Impact in Alveolar Bone Healing in Homeostatic Conditions. Front Immunol 2021; 12:782566. [PMID: 34992601 PMCID: PMC8724033 DOI: 10.3389/fimmu.2021.782566] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 11/29/2021] [Indexed: 12/20/2022] Open
Abstract
Host inflammatory immune response comprises an essential element of the bone healing process, where M2 polarization allegedly contributes to a favorable healing outcome. In this context, immunoregulatory molecules that modulate host response, including macrophage polarization, are considered potential targets for improving bone healing. This study aims to evaluate the role of the immunoregulatory molecules VIP (Vasoactive intestinal peptide) and PACAP (Pituitary adenylate cyclase activating polypeptide), which was previously described to favor the development of the M2 phenotype, in the process of alveolar bone healing in C57Bl/6 (WT) mice. Experimental groups were submitted to tooth extraction and maintained under control conditions or treated with VIP or PACAP were evaluated by microtomographic (µCT), histomorphometric, immunohistochemical, and molecular analysis at 0, 3, 7, and 14 days to quantify tissue healing and host response indicators at the healing site. Gene expression analysis demonstrates the effectiveness of VIP or PACAP in modulating host response, evidenced by the early dominance of an M2-type response, which was paralleled by a significant increase in M2 (CD206+) in treated groups. However, despite the marked effect of M1/M2 balance in the healing sites, the histomorphometric analysis does not reveal an equivalent/corresponding modulation of the healing process. µCT reveals a slight increase in bone matrix volume and the trabecular thickness number in the PACAP group, while histomorphometric analyzes reveal a slight increase in the VIP group, both at a 14-d time-point; despite the increased expression of osteogenic factors, osteoblastic differentiation, activity, and maturation markers in both VIP and PACAP groups. Interestingly, a lower number of VIP and PACAP immunolabeled cells were observed in the treated groups, suggesting a reduction in endogenous production. In conclusion, while both VIP and PACAP treatments presented a significant immunomodulatory effect with potential for increased healing, no major changes were observed in bone healing outcome, suggesting that the signals required for bone healing under homeostatic conditions are already optimal, and additional signals do not improve an already optimal process. Further studies are required to elucidate the role of macrophage polarization in the bone healing process.
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Affiliation(s)
| | - Angélica Cristina Fonseca
- Bauru School of Dentistry, Department of Biological Sciences, University of São Paulo, Bauru, Brazil
| | - Priscila Maria Colavite
- Bauru School of Dentistry, Department of Biological Sciences, University of São Paulo, Bauru, Brazil
| | - Jéssica Lima Melchiades
- Bauru School of Dentistry, Department of Biological Sciences, University of São Paulo, Bauru, Brazil
| | - André Petenuci Tabanez
- Bauru School of Dentistry, Department of Biological Sciences, University of São Paulo, Bauru, Brazil
| | - Ana Campos Codo
- School of Pharmaceutical Sciences, Department of Immunology, São Paulo State University, Araraquara, Brazil
| | - Alexandra Ivo de Medeiros
- School of Pharmaceutical Sciences, Department of Immunology, São Paulo State University, Araraquara, Brazil
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Xiao Q, Guo T, Li J, Li L, Chen K, Zhou L, Wu W, So KF, Ramakrishna S, Liu B, Rong L, Chen G, Xing X, He L. Macrophage polarization induced by sustained release of 7,8-DHF from aligned PLLA fibers potentially for neural stem cell neurogenesis. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 118:111415. [PMID: 33255017 DOI: 10.1016/j.msec.2020.111415] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 08/17/2020] [Accepted: 08/19/2020] [Indexed: 01/06/2023]
Abstract
Neural stem cells (NSCs)-based regenerative medicine provides unprecedented therapeutic potential in neural insults. However, NSC-based neurogenesis is strongly influenced by the inflammatory environment after injury, which is mainly modulated by macrophages' secretion effects. In this study, we adopted poly L-lactic acid (PLLA) aligned fibers to guide macrophages elongating along the fiber directions and polarizing phenotypically toward anti-inflammatory M2 type. 7,8-DHF was loaded within the fibers with a sustained and controlled release pattern to promote the polarization of the macrophages and secretion of various anti-inflammatory factors. NSCs showed enhanced neuronal differentiation in the presence of the conditioned medium (CM) from M2 macrophages cultured on the 7,8-DHF-loaded PLLA aligned fibers. Moreover, M2-CM promoted neurogenesis by enhancing neurite outgrowth of NSC-derived neurons. In summary, we provided a novel therapeutic strategy for NSC neurogenesis by manipulating macrophage classification into anti-inflammatory M2 phenotypes with the 7,8-DHF-loaded PLLA aligned fibers, existing potential applications in treating neural injuries.
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Affiliation(s)
- Qiao Xiao
- MOE Joint International Research Laboratory of CNS Regeneration, Guangdong-Hong Kong-Macau Institute of CNS Regeneration (GHMICR), Jinan University, Guangzhou 510632, China
| | - Ting Guo
- MOE Joint International Research Laboratory of CNS Regeneration, Guangdong-Hong Kong-Macau Institute of CNS Regeneration (GHMICR), Jinan University, Guangzhou 510632, China
| | - Jun Li
- MOE Joint International Research Laboratory of CNS Regeneration, Guangdong-Hong Kong-Macau Institute of CNS Regeneration (GHMICR), Jinan University, Guangzhou 510632, China
| | - Liming Li
- MOE Joint International Research Laboratory of CNS Regeneration, Guangdong-Hong Kong-Macau Institute of CNS Regeneration (GHMICR), Jinan University, Guangzhou 510632, China
| | - Kaixin Chen
- MOE Joint International Research Laboratory of CNS Regeneration, Guangdong-Hong Kong-Macau Institute of CNS Regeneration (GHMICR), Jinan University, Guangzhou 510632, China
| | - Libing Zhou
- MOE Joint International Research Laboratory of CNS Regeneration, Guangdong-Hong Kong-Macau Institute of CNS Regeneration (GHMICR), Jinan University, Guangzhou 510632, China
| | - Wutian Wu
- MOE Joint International Research Laboratory of CNS Regeneration, Guangdong-Hong Kong-Macau Institute of CNS Regeneration (GHMICR), Jinan University, Guangzhou 510632, China; Department of Biotechnology, Key Laboratory of Virology of Guangzhou, College of Life Science and Technology, Jinan University, Guangzhou 510630, China
| | - Kwok-Fai So
- MOE Joint International Research Laboratory of CNS Regeneration, Guangdong-Hong Kong-Macau Institute of CNS Regeneration (GHMICR), Jinan University, Guangzhou 510632, China
| | - Seeram Ramakrishna
- MOE Joint International Research Laboratory of CNS Regeneration, Guangdong-Hong Kong-Macau Institute of CNS Regeneration (GHMICR), Jinan University, Guangzhou 510632, China; Department of Mechanical Engineering, Faculty of Engineering, National University of Singapore, Singapore 117576, Singapore
| | - Bin Liu
- Department of Spine Surgery, The 3rd Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510630, China
| | - Limin Rong
- Department of Spine Surgery, The 3rd Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510630, China
| | - Guoqiang Chen
- The First People's Hospital of Foshan, Foshan 528000, Guangdong, China
| | - Xiwen Xing
- Department of Biotechnology, Key Laboratory of Virology of Guangzhou, College of Life Science and Technology, Jinan University, Guangzhou 510630, China.
| | - Liumin He
- MOE Joint International Research Laboratory of CNS Regeneration, Guangdong-Hong Kong-Macau Institute of CNS Regeneration (GHMICR), Jinan University, Guangzhou 510632, China; Department of Spine Surgery, The 3rd Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510630, China.
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Ma Y, Deng M, Liu M. Effect of Differently Polarized Macrophages on Proliferation and Differentiation of Ependymal Cells from Adult Spinal Cord. J Neurotrauma 2019; 36:2337-2347. [PMID: 30638124 DOI: 10.1089/neu.2018.6133] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Affiliation(s)
- Yonggang Ma
- 1Department of Orthopedics, Renmin Hospital, School of Basic Medical Sciences, Wuhan University, Wuhan City, China
| | - Ming Deng
- 1Department of Orthopedics, Renmin Hospital, School of Basic Medical Sciences, Wuhan University, Wuhan City, China
| | - Min Liu
- 2Department of Immunology, School of Basic Medical Sciences, Wuhan University, Wuhan City, China
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Do Neuroendocrine Peptides and Their Receptors Qualify as Novel Therapeutic Targets in Osteoarthritis? Int J Mol Sci 2018; 19:ijms19020367. [PMID: 29373492 PMCID: PMC5855589 DOI: 10.3390/ijms19020367] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 01/22/2018] [Accepted: 01/23/2018] [Indexed: 01/15/2023] Open
Abstract
Joint tissues like synovium, articular cartilage, meniscus and subchondral bone, are targets for neuropeptides. Resident cells of these tissues express receptors for various neuroendocrine-derived peptides including proopiomelanocortin (POMC)-derived peptides, i.e., α-melanocyte-stimulating hormone (α-MSH), adrenocorticotropin (ACTH) and β-endorphin (β-ED), and sympathetic neuropeptides like vasoactive intestinal peptide (VIP) and neuropeptide y (NPY). Melanocortins attained particular attention due to their immunomodulatory and anti-inflammatory effects in several tissues and organs. In particular, α-MSH, ACTH and specific melanocortin-receptor (MCR) agonists appear to have promising anti-inflammatory actions demonstrated in animal models of experimentally induced arthritis and osteoarthritis (OA). Sympathetic neuropeptides have obtained increasing attention as they have crucial trophic effects that are critical for joint tissue and bone homeostasis. VIP and NPY are implicated in direct and indirect activation of several anabolic signaling pathways in bone and synovial cells. Additionally, pituitary adenylate cyclase-activating polypeptide (PACAP) proved to be chondroprotective and, thus, might be a novel target in OA. Taken together, it appears more and more likely that the anabolic effects of these neuroendocrine peptides or their respective receptor agonists/antagonists may be exploited for the treatment of patients with inflammatory and degenerative joint diseases in the future.
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