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Sun X, Ni S, Zhou Q, Zou D. Exogenous NT-3 Promotes Phenotype Switch of Resident Macrophages and Improves Sciatic Nerve Injury through AMPK/NF-κB Signaling Pathway. Neurochem Res 2024:10.1007/s11064-024-04198-6. [PMID: 38904909 DOI: 10.1007/s11064-024-04198-6] [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: 04/30/2024] [Revised: 05/29/2024] [Accepted: 06/14/2024] [Indexed: 06/22/2024]
Abstract
Neurotrophin-3 (NT-3) is an important family of neurotrophic factors with extensive neurotrophic activity, which can maintain the survival and regeneration of nerve cells. However, the mechanism of NT-3 on macrophage phenotype transformation after sciatic nerve injury is not clear. In this study, we constructed a scientific nerve compression injury animal model and administered different doses of NT-3 treatment through osmotic minipump. 7 days after surgery, we collected sciatic nerve tissue and observed the distribution of macrophage phenotype through iNOS and CD206 immunofluorescence. During the experiment, regular postoperative observations were conducted on rats. After the experiment, sciatic nerve tissue was collected for HE staining, myelin staining, immunofluorescence staining, and Western blot analysis. To verify the role of the AMPK/NF-κB pathway, we applied the AMPK inhibitor Compound C and the NF-κB inhibitor BAY11-7082 to repeat the above experiment. Our experimental results reveal that NT-3 promotes sciatic nerve injury repair and polarization of M2 macrophage phenotype, promotes AMPK activation, and inhibits NF-κB activation. The repair effect of high concentration NT-3 on sciatic nerve injury is significantly enhanced compared to low concentration. Compound C administration can weaken the effect of NT-3, while BAY 11-7082 can enhance the effect of NT-3. In short, NT-3 significantly improves sciatic nerve injury in rats, promotes sciatic nerve function repair, accelerates M2 macrophage phenotype polarization, and improves neuroinflammatory response. The protective effects of NT-3 mentioned above are partially related to the AMPK/NF-κB signal axis.
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Affiliation(s)
- Xuri Sun
- Department of Spine Surgery, Yantaishan Hospital, No.10087, Science and Technology Avenue, Laishan District, Yantai, Shandong, China
| | - Shuqin Ni
- Department of Spine Surgery, Yantaishan Hospital, No.10087, Science and Technology Avenue, Laishan District, Yantai, Shandong, China
| | - Qingsheng Zhou
- Department of Spine Surgery, Yantaishan Hospital, No.10087, Science and Technology Avenue, Laishan District, Yantai, Shandong, China
| | - Dexin Zou
- Department of Spine Surgery, Yantaishan Hospital, No.10087, Science and Technology Avenue, Laishan District, Yantai, Shandong, China.
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Zhang S, Sun S, He J, Shen L. NT-3 promotes osteogenic differentiation of mouse bone marrow mesenchymal stem cells by regulating the Akt pathway. JOURNAL OF MUSCULOSKELETAL & NEURONAL INTERACTIONS 2020; 20:591-599. [PMID: 33265088 PMCID: PMC7716693 DOI: pmid/33265088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Accepted: 08/31/2020] [Indexed: 02/05/2023]
Abstract
OBJECTIVES To investigate the effect of neurotrophin-3 (NT-3) on osteogenic/adipogenic differentiation of bone marrow mesenchymal stem cells (BMSCs). METHODS Osteogenic differentiation was detected by alkaline phosphatase (ALP) staining and alizarin red staining (ARS). Adipogenic differentiation was detected by oil red O (ORO) staining. The expression of bone-related genes (Runx2, Osterix, OCN, ALP) and lipogenic genes (FABP4, PPAR, CEBP, LPL) was detected by real-time quantitative polymerase chain reaction (real-time qPCR). The expression of p-Akt and Akt protein was detected by Western blot assay. RESULTS ALP staining and ARS staining showed that the overexpression of NT-3 could promote the differentiation into osteoblasts, while knockdown of NT-3 could inhibit that. Real-time qPCR showed that the overexpression of NT-3 could increase the expression of osteoblast genes, while knockdown of NT-3 could inhibit that. ORO staining showed that the overexpression of NT-3 could inhibit the differentiation into adipogenesis, while knockdown of NT-3 can promote that. Real-time qPCR showed that the overexpression of NT-3 could reduce the expression of lipogenic genes. while knockdown NT-3 could increase that. In addition, the overexpression of NT-3 increased p-Akt/Akt levels significantly, while knockdown NT-3 reduced that significantly. CONCLUSION NT-3 could promote the differentiation of mouse BMSCs into osteoblasts and inhibit their differentiation into adipogenesis.
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Affiliation(s)
- Shanqiang Zhang
- Medical Research Center, Yue Bei People’s Hospital Affiliated to Shantou University Medical College, P.R. China
- Department of Anatomy, Qiqihar Medical University, P.R. China
| | - Shizhu Sun
- Department of Anatomy, Qiqihar Medical University, P.R. China
| | - Jun He
- Department of Anatomy, Qiqihar Medical University, P.R. China
| | - Lei Shen
- Department of Anatomy, Qiqihar Medical University, P.R. China
- Corresponding author: Lei Shen, Department of Anatomy, Qiqihar Medical University, No. 333 Bukui North Street, Jianhua District, Qiqihar City, Heilongjiang 161006, P.R. China E-mail:
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Uesaka T, Young HM, Pachnis V, Enomoto H. Development of the intrinsic and extrinsic innervation of the gut. Dev Biol 2016; 417:158-67. [PMID: 27112528 DOI: 10.1016/j.ydbio.2016.04.016] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Revised: 04/09/2016] [Accepted: 04/21/2016] [Indexed: 12/16/2022]
Abstract
The gastrointestinal (GI) tract is innervated by intrinsic enteric neurons and by extrinsic efferent and afferent nerves. The enteric (intrinsic) nervous system (ENS) in most regions of the gut consists of two main ganglionated layers; myenteric and submucosal ganglia, containing numerous types of enteric neurons and glial cells. Axons arising from the ENS and from extrinsic neurons innervate most layers of the gut wall and regulate many gut functions. The majority of ENS cells are derived from vagal neural crest cells (NCCs), which proliferate, colonize the entire gut, and first populate the myenteric region. After gut colonization by vagal NCCs, the extrinsic nerve fibers reach the GI tract, and Schwann cell precursors (SCPs) enter the gut along the extrinsic nerves. Furthermore, a subpopulation of cells in myenteric ganglia undergoes a radial (inward) migration to form the submucosal plexus, and the intrinsic and extrinsic innervation to the mucosal region develops. Here, we focus on recent progress in understanding the developmental processes that occur after the gut is colonized by vagal ENS precursors, and provide an up-to-date overview of molecular mechanisms regulating the development of the intrinsic and extrinsic innervation of the GI tract.
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Affiliation(s)
- Toshihiro Uesaka
- Division of Neural Differentiation and Regeneration, Department of Physiology and Cell Biology, Graduate School of Medicine, Kobe University, Kobe 650-0017, Japan; Laboratory for Neuronal Differentiation and Regeneration, RIKEN Center for Developmental Biology, Kobe 650-0047, Japan; Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Saitama 332-0012, Japan.
| | - Heather M Young
- Department of Anatomy and Neuroscience, University of Melbourne, 3010 VIC, Australia
| | - Vassilis Pachnis
- Division of Molecular Neurobiology, MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
| | - Hideki Enomoto
- Division of Neural Differentiation and Regeneration, Department of Physiology and Cell Biology, Graduate School of Medicine, Kobe University, Kobe 650-0017, Japan; Laboratory for Neuronal Differentiation and Regeneration, RIKEN Center for Developmental Biology, Kobe 650-0047, Japan; Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Saitama 332-0012, Japan
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Zhu T, Yu D, Feng J, Wu X, Xiang L, Gao H, Zhang X, Wei M. GDNF and NT-3 induce progenitor bone mesenchymal stem cell differentiation into neurons in fetal gut culture medium. Cell Mol Neurobiol 2014; 35:255-64. [PMID: 25301495 DOI: 10.1007/s10571-014-0120-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2014] [Accepted: 09/27/2014] [Indexed: 12/20/2022]
Abstract
With the increasing use of bone marrow mesenchymal stem cells (BMSCs) in cell therapies, factors regulating BMSC differentiation have become the interest of current research. In this study, we investigated the effects of glial cell-derived neurotrophic factor (GDNF) and neurotrophin-3 (NT-3) on the course of BMSC differentiation. BMSCs were isolated from rat bone marrow and transfected with GDNF and NT-3 genes. Compared to mock-transfected BMSCs, GDNF and NT-3 induced BMSC differentiation to reveal neuron-like characteristics, i.e., the positive expression of neuronal marker MAP-2 and astrocyte marker GFAP, as detected by immunofluorescence assays. Semi-quantitative polymerase chain reaction (PCR) and western blot analyses showed that the increase of expression of GDNF and NT-3 in BMSCs also simultaneously elevated the mRNA expression of NSE, nestin, and MAP-2. Furthermore, the cell patch-clamp test demonstrated that the overexpression of GDNF and NT-3 in BMSCs enhanced voltage-activated potassium currents, implying that BMSCs possess great potential as a cell-based therapeutic candidate to treat neurological diseases.
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Affiliation(s)
- Tianqi Zhu
- Department of Pediatric Surgery, Tongji Hospital, Huazhong University of Science and Technology, 1095 Jiefang Avenue, Hankou, Wuhan, China
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Fox EA, Biddinger JE, Baquet ZC, Jones KR, McAdams J. Loss of neurotrophin-3 from smooth muscle disrupts vagal gastrointestinal afferent signaling and satiation. Am J Physiol Regul Integr Comp Physiol 2013; 305:R1307-22. [PMID: 24068045 PMCID: PMC3882559 DOI: 10.1152/ajpregu.00337.2013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A large proportion of vagal afferents are dependent on neurotrophin-3 (NT-3) for survival. NT-3 is expressed in developing gastrointestinal (GI) smooth muscle, a tissue densely innervated by vagal mechanoreceptors, and thus could regulate their survival. We genetically ablated NT-3 from developing GI smooth muscle and examined the pattern of loss of NT-3 expression in the GI tract and whether this loss altered vagal afferent signaling or feeding behavior. Meal-induced c-Fos activation was reduced in the solitary tract nucleus and area postrema in mice with a smooth muscle-specific NT-3 knockout (SM-NT-3(KO)) compared with controls, suggesting a decrease in vagal afferent signaling. Daily food intake and body weight of SM-NT-3(KO) mice and controls were similar. Meal pattern analysis revealed that mutants, however, had increases in average and total daily meal duration compared with controls. Mutants maintained normal meal size by decreasing eating rate compared with controls. Although microstructural analysis did not reveal a decrease in the rate of decay of eating in SM-NT-3(KO) mice, they ate continuously during the 30-min meal, whereas controls terminated feeding after 22 min. This led to a 74% increase in first daily meal size of SM-NT-3(KO) mice compared with controls. The increases in meal duration and first meal size of SM-NT-3(KO) mice are consistent with reduced satiation signaling by vagal afferents. This is the first demonstration of a role for GI NT-3 in short-term controls of feeding, most likely involving effects on development of vagal GI afferents that regulate satiation.
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Affiliation(s)
- Edward A Fox
- Behavioral Neurogenetics Laboratory, Department of Psychological Sciences, Purdue University, West Lafayette, Indiana; and
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Saruta J, Iida M, Kondo Y, To M, Hayashi T, Hori M, Sato S, Tsukinoki K. Chronic stress induces neurotrophin-3 in rat submandibular gland. Yonsei Med J 2012; 53:1085-92. [PMID: 23074106 PMCID: PMC3481377 DOI: 10.3349/ymj.2012.53.6.1085] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
PURPOSE Plasma neurotrophin-3 (NT-3) levels are associated with several neural disorders. We previously reported that neurotrophins were released from salivary glands following acute immobilization stress. While the salivary glands were the source of plasma neurotrophins in that situation, the association between the expression of neurotrophins and the salivary gland under chronic stress conditions is not well understood. In the present study, we investigated whether NT-3 levels in the salivary gland and plasma were influenced by chronic stress. MATERIALS AND METHODS Expressions of NT-3 mRNA and protein were characterized, using real-time polymerase chain reactions, enzyme-linked immunosorbent assay, and immunohistochemistry, in the submandibular glands of male rats exposed to chronic stress (12 h daily for 22 days). RESULTS Plasma NT-3 levels were significantly increased by chronic stress (p<0.05), and remained elevated in bilaterally sialoadenectomized rats under the same condition. Since chronic stress increases plasma NT-3 levels in the sialoadenectomized rat model, plasma NT-3 levels were not exclusively dependent on salivary glands. CONCLUSION While the salivary gland was identified in our previous study as the source of plasma neurotrophins during acute stress, the exposure to long-term stress likely affects a variety of organs capable of releasing NT-3 into the bloodstream. In addition, the elevation of plasma NT-3 levels may play important roles in homeostasis under stress conditions.
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Affiliation(s)
- Juri Saruta
- Division of Pathology, Department of Maxillofacial Diagnostic Science, Kanagawa Dental College, Kanagawa, Japan
- Research Institute of Salivary Gland and Health Medicine, Kanagawa Dental College, Kanagawa, Japan
| | - Michitaro Iida
- Research Institute of Salivary Gland and Health Medicine, Kanagawa Dental College, Kanagawa, Japan
- Department of Oral Pathology, Kanagawa Dental College Postgraduate School, Kanagawa, Japan
| | - Yusuke Kondo
- Division of Pathology, Department of Maxillofacial Diagnostic Science, Kanagawa Dental College, Kanagawa, Japan
- Research Institute of Salivary Gland and Health Medicine, Kanagawa Dental College, Kanagawa, Japan
| | - Masahiro To
- Division of Pathology, Department of Maxillofacial Diagnostic Science, Kanagawa Dental College, Kanagawa, Japan
- Research Institute of Salivary Gland and Health Medicine, Kanagawa Dental College, Kanagawa, Japan
| | - Takashi Hayashi
- Division of Pathology, Department of Maxillofacial Diagnostic Science, Kanagawa Dental College, Kanagawa, Japan
- Research Institute of Salivary Gland and Health Medicine, Kanagawa Dental College, Kanagawa, Japan
| | - Mayumi Hori
- Division of Pathology, Department of Maxillofacial Diagnostic Science, Kanagawa Dental College, Kanagawa, Japan
- Deparment of Pathology, Yokosuka Kyousai Hospital, Kanagawa, Japan
| | - Sadao Sato
- Division of Orthodontics, Department of Craniofacial Growth and Development Dentistry, Kanagawa Dental College, Kanagawa, Japan
| | - Keiichi Tsukinoki
- Division of Pathology, Department of Maxillofacial Diagnostic Science, Kanagawa Dental College, Kanagawa, Japan
- Research Institute of Salivary Gland and Health Medicine, Kanagawa Dental College, Kanagawa, Japan
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Fox EA, Biddinger JE, Jones KR, McAdams J, Worman A. Mechanism of hyperphagia contributing to obesity in brain-derived neurotrophic factor knockout mice. Neuroscience 2012; 229:176-99. [PMID: 23069761 DOI: 10.1016/j.neuroscience.2012.09.078] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Revised: 09/28/2012] [Accepted: 09/28/2012] [Indexed: 10/27/2022]
Abstract
Global-heterozygous and brain-specific homozygous knockouts (KOs) of brain-derived neurotrophic factor (BDNF) cause late- and early-onset obesity, respectively, both involving hyperphagia. Little is known about the mechanism underlying this hyperphagia or whether BDNF loss from peripheral tissues could contribute to overeating. Since global-homozygous BDNF-KO is perinatal lethal, a BDNF-KO that spared sufficient brainstem BDNF to support normal health was utilized to begin to address these issues. Meal pattern and microstructure analyses suggested overeating of BDNF-KO mice was mediated by deficits in both satiation and satiety that resulted in increased meal size and frequency and implicated a reduction of vagal signaling from the gut to the brain. Meal-induced c-Fos activation in the nucleus of the solitary tract, a more direct measure of vagal afferent signaling, however, was not decreased in BDNF-KO mice, and thus was not consistent with a vagal afferent role. Interestingly though, meal-induced c-Fos activation was increased in the dorsal motor nucleus of the vagus nerve (DMV) of BDNF-KO mice. This could imply that augmentation of vago-vagal digestive reflexes occurred (e.g., accommodation), which would support increased meal size and possibly increased meal number by reducing the increase in intragastric pressure produced by a given amount of ingesta. Additionally, vagal sensory neuron number in BDNF-KO mice was altered in a manner consistent with the increased meal-induced activation of the DMV. These results suggest reduced BDNF causes satiety and satiation deficits that support hyperphagia, possibly involving augmentation of vago-vagal reflexes mediated by central pathways or vagal afferents regulated by BDNF levels.
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Affiliation(s)
- E A Fox
- Behavioral Neurogenetics Laboratory, Department of Psychological Sciences, Purdue University, West Lafayette, IN 47907, USA.
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Vagal afferent controls of feeding: a possible role for gastrointestinal BDNF. Clin Auton Res 2012; 23:15-31. [PMID: 22717678 DOI: 10.1007/s10286-012-0170-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2012] [Accepted: 05/24/2012] [Indexed: 01/08/2023]
Abstract
INTRODUCTION Vagal gastrointestinal (GI) afferents do not appear to contribute to long-term controls of feeding, despite downstream connections that could support such a role. This view is largely attributable to a lack of evidence for long-term effects, especially the failure of vagal afferent lesions to produce hyperphagia or obesity. AIMS Here, the possibility is evaluated that "side effects" of vagal lesion methods resulting largely from complexities of vagal organization would probably suppress long-term effects. Criteria based on knowledge of vagal organization were utilized to critique and compare vagal lesion methods and to interpret their effects on GI function, feeding and body weight. RESULTS AND CONCLUSIONS This analysis suggested that it was premature to eliminate a long-term vagal GI afferent role based on the effects of these lesions and highlighted aspects of vagal organization that must be addressed to reduce the problematic side effects of vagal lesions. The potential of "genetic" lesions that alter vagal sensory development to address these aspects, examination of the feasibility of this approach, and the properties of brain-derived neurotrophic factor (BDNF) that made it an attractive candidate for application of this approach are described. BDNF knockout from GI smooth muscle unexpectedly demonstrated substantial overeating and weight gain associated with increased meal size and frequency. The decay of eating rate during a scheduled meal was also reduced. However, meal-induced c-Fos activation was increased in the dorsal motor nucleus of the vagus, suggesting that the effect on eating rate was due to augmentation of GI reflexes by vagal afferents or other neural systems.
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Gao H, Wei M, Wang Y, Wu X, Zhu T. Differentiation of GDNF and NT-3 dual gene-modified rat bone marrow mesenchymal stem cells into enteric neuron-like cells. ACTA ACUST UNITED AC 2012; 32:87-91. [DOI: 10.1007/s11596-012-0015-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2011] [Indexed: 12/27/2022]
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Abstract
BACKGROUND The vagus nerve is the major neural connection between the gastrointestinal tract and the central nervous system. During fetal development, axons from the cell bodies of the nodose ganglia and the dorsal motor nucleus grow into the gut to find their enteric targets, providing the vagal sensory and motor innervations respectively. Vagal sensory and motor axons innervate selective targets, suggesting a role for guidance cues in the establishment of the normal pattern of enteric vagal innervation. PURPOSE This review explores known molecular mechanisms that guide vagal innervation in the gastrointestinal tract. Guidance and growth factors, such as netrin-1 and its receptor, deleted in colorectal cancer, extracellular matrix molecules, such as laminin-111, and members of the neurotrophin family of molecules, such as brain-derived neurotrophic factor have been identified as mediating the guidance of vagal axons to the fetal mouse gut. In addition to increasing our understanding of the development of enteric innervation, studies of vagal development may also reveal clinically relevant insights into the underlying mechanisms of vago-vagal communication with the gastrointestinal tract.
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Affiliation(s)
- E M Ratcliffe
- Division of Gastroenterology and Nutrition, Department of Pediatrics, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada.
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