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Gu H, Ru Y, Wang W, Cai G, Gu L, Ye J, Zhang WB, Wang L. Orexin-A Reverse Bone Mass Loss Induced by Chronic Intermittent Hypoxia Through OX1R-Nrf2/HIF-1α Pathway. Drug Des Devel Ther 2022; 16:2145-2160. [PMID: 35818538 PMCID: PMC9270907 DOI: 10.2147/dddt.s363286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Accepted: 05/24/2022] [Indexed: 11/28/2022] Open
Abstract
Background Recent studies suggest that there is a potential connection between obstructive sleep apnea (OSA) and osteoporosis through dysregulation of bone metabolism. Orexin-A, a neuroprotective peptide secreted by the hypothalamus, is at a lower level in the plasma of OSA patients, which regulates appetite, energy expenditure and sleep-wake states. However, the protective effect of orexin-A on bone metabolism in OSA is unclear. Purpose To investigate whether the activation of OX1R by orexin-A can reverse bone mass loss induced by chronic intermittent hypoxia (CIH). Methods Mice were randomly divided into the normoxia group and CIH group. Within the CIH or normoxia groups, treatment groups were given a subcutaneous injection of either orexin-A or saline vehicle once every day for 4 weeks and then femurs were removed for micro-CT scans. Histology and immunohistochemical staining were performed to observe and calculate the changes in femurs as a result of hypoxia. Cell immunofluorescence and immunohistochemical staining were used to detect the expression of orexin receptors in MC3T3-E1 cells or in bones. CCK-8 assay, ALP assay kit and alizarin red staining were used to detect the viability, alkaline phosphatase (ALP) activity, and capacity of mineralization, respectively. The effect of orexin-A on osteogenic differentiation of MC3T3-E1 cells was evaluated using qRT-PCR, Western blot and cell staining. Results CIH led to a decrease in the amount and density of trabecular bone, downregulated OCN expression while increasing osteoclast numbers in femurs and inhibited the expression of RUNX2, OSX, OPN and Nrf2 in MC3T3-E1 cells. Orexin-A treatment alleviated these CIH-induced effects by combining to OX1R. The level of HIF-1α was elevated both in CIH and orexin-A treatment groups. Conclusion CIH environment inhibits osteogenesis and orexin-A can reverse bone mass loss induced by CIH through OX1R-Nrf2/HIF-1α pathway.
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Affiliation(s)
- Hong Gu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, People′s Republic of China
| | - Yiwen Ru
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, People′s Republic of China
| | - Wei Wang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, People′s Republic of China
- Department of Orthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, People′s Republic of China
| | - Guanhui Cai
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, People′s Republic of China
| | - Lanxin Gu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, People′s Republic of China
| | - Junjie Ye
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, People′s Republic of China
| | - Wei-Bing Zhang
- Department of Stomatology, Dushu Lake Hospital Affiliated to Soochow University, Suzhou, People′s Republic of China
- Department of Stomatology, Medical Center of Soochow University, Suzhou, People′s Republic of China
- Correspondence: Wei-Bing Zhang, Department of Stomatology, Dushu Lake Hospital Affiliated to Soochow University, 9 Chongwen Road, Suzhou, 215000, People′s Republic of China, Tel +86-512-67505200, Email
| | - Lin Wang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, People′s Republic of China
- Department of Orthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, People′s Republic of China
- Lin Wang, Department of Orthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, People′s Republic of China, Tel +86-025-69593060, Email
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2
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Daniel S, Cohen-Freud Y, Shelef I, Tarasiuk A. Bone mineral density alteration in obstructive sleep apnea by derived computed tomography screening. Sci Rep 2022; 12:6462. [PMID: 35440678 PMCID: PMC9018731 DOI: 10.1038/s41598-022-10313-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 04/05/2022] [Indexed: 01/07/2023] Open
Abstract
The association between obstructive sleep apnea (OSA) and bone mineral density (BMD) is poorly elucidated and has contradictory findings. Abdominal computed tomography (CT) for other indications can provide a valuable opportunity for osteoporosis screening. Thus, we retrospectively explored the association between OSA and BMD by examining abdominal CT vertebrae images for a multitude of conditions and indications. We included 315 subjects (174 with OSA and 141 without OSA) who performed at least two CT scans (under similar settings). Both groups had a similar duration between the first and second CT scans of 3.6 years. BMD decreased in those with OSA and increased age. A multivariate linear regression indicated that OSA is associated with BMD alterations after controlling for age, gender, and cardiovascular diseases. Here, we report that OSA is associated with BMD alterations. Further studies are required to untangle the complex affect of OSA on BMD and the possible clinical implications of vertebra-depressed or femoral neck fractures.
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Affiliation(s)
- Sharon Daniel
- Sleep-Wake Disorders Unit, Soroka Medical Center, Beer-Sheva, Israel.,Department of Public Health and Pediatrics, Faculty of Health Sciences, Ben-Gurion University of the Negev and Clalit Health Services, Southern District, Beer-Sheva, Israel
| | - Yafit Cohen-Freud
- Radiology Department, Soroka University Medical Center, Beer-Sheva, Israel
| | - Ilan Shelef
- Radiology Department, Soroka University Medical Center, Beer-Sheva, Israel.,Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Ariel Tarasiuk
- Sleep-Wake Disorders Unit, Soroka Medical Center, Beer-Sheva, Israel. .,Department of Physiology and Cell Biology, Ben-Gurion University of the Negev, Beer-Sheva, Israel. .,Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel. .,Sleep-Wake Disorders Unit & Department of Physiology, Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O. Box 105, 84105, Beer-Sheva, Israel.
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3
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Biological Deciphering of the “Kidney Governing Bones” Theory in Traditional Chinese Medicine. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2022; 2022:1685052. [PMID: 35392645 PMCID: PMC8983196 DOI: 10.1155/2022/1685052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 02/22/2022] [Accepted: 02/23/2022] [Indexed: 11/17/2022]
Abstract
The description of the “kidney” was entirely different from modern medicine. In traditional Chinese medicine (TCM), the kidney was a functional concept regulating water metabolism, which was closely related to the urinary system, reproductive system, nervous system, endocrine, skeleton, hearing, metabolism, immunity, etc. In particular, the kidney in TCM plays an important regulatory role in the processes of growth, development, prime, aging, and reproduction. Hence, “Kidney Governing Bone” (KGB) was a classical theory in TCM, which hypothesized that the function of the kidney was responsible for bone health. However, the related modern physiological mechanisms of this TCM theory are unclear. This present paper proposed a new understanding and explored the biological basis of the KGB theory. After searching through plenty of reported literature, we discovered that the functions of the kidney in TCM were closely associated with the hypothalamic-pituitary-gonadal (HPG) axis in modern science. The physiological mechanism of the KGB was regulated by sex hormones and their receptors. This review deciphered the connotation of the KGB theory in modern medicine and further verified the scientificity of the basic TCM theory.
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4
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Boushra AF, Mahmoud RH, Ayoub SE, Mohammed RA, Shamardl HA, El Amin Ali AM. The Potential Therapeutic Effect of Orexin-Treated versus Orexin-Untreated Adipose Tissue-Derived Mesenchymal Stem Cell Therapy on Insulin Resistance in Type 2 Diabetic Rats. J Diabetes Res 2022; 2022:9832212. [PMID: 35083338 PMCID: PMC8786498 DOI: 10.1155/2022/9832212] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Revised: 12/05/2021] [Accepted: 12/20/2021] [Indexed: 11/18/2022] Open
Abstract
Type 2 diabetes mellitus is a chronic metabolic disease characterized by resistance to peripheral insulin actions. Mesenchymal stem cells have been studied for years in T2DM therapy, including adipose tissue-derived mesenchymal stem cells (AD-MSCs). Orexin neuropeptides (A and B) are well-known regulators of appetite and physical activity. The aim of this work was to elucidate the possible therapeutic effect of AD-MSC preconditioning with orexin A (OXA) on insulin resistance in rats. Twenty-eight adult male albino rats were divided into 4 equal groups: a normal control group and 3 diabetic groups (a control T2DM group, diabetic rats treated by an AD-MSCs group, and diabetic rats treated by AD-MSCs preconditioned with OXA). We noticed that the treated groups showed a significant alleviation of insulin resistance parameters as shown in lowering the serum levels of glucose, insulin, total cholesterol, inflammatory markers, and HOMA-IR as compared to the control diabetic group with more significant reduction observed in the OXA-pretreated AD-MSCs-administrated group. More improvement was also noted in the glucose uptake and GLUT-4 gene expression in the skeletal muscle and adipose tissue in the OXA-pretreated AD-MSCs-administrated group compared to the untreated diabetic group. Conclusion. Preconditioning of AD-MSCs with OXA can significantly increase their potential to reduce the insulin resistance in the rat model of T2DM.
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Affiliation(s)
- Amy F. Boushra
- Department of Medical Physiology, Faculty of Medicine, Fayoum University, Egypt
| | - Rania H. Mahmoud
- Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Fayoum University, Egypt
| | - Shymaa E. Ayoub
- Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Fayoum University, Egypt
| | - Rehab A. Mohammed
- Department of Medical Physiology, Faculty of Medicine, Fayoum University, Egypt
| | - Hanan A. Shamardl
- Department of Medical Pharmacology Faculty of Medicine, Fayoum University, Egypt
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5
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Han D, Shi Y, Han F. The effects of orexin-A and orexin receptors on anxiety- and depression-related behaviors in a male rat model of post-traumatic stress disorder. J Comp Neurol 2021; 530:592-606. [PMID: 34387361 DOI: 10.1002/cne.25231] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Revised: 08/08/2021] [Accepted: 08/09/2021] [Indexed: 12/14/2022]
Abstract
Orexin neurons play an important role in stress-related mental disorders including post-traumatic stress disorder (PTSD). Anxiety- and depression-related symptoms commonly occur in combination with PTSD. However, the role of the orexin system in mediating alterations in these affective symptoms remains unclear. The medial prefrontal cortex (mPFC) is implicated in both cognitive and emotional processing. In the present study, we investigated anxiety- and depression-related behavioral changes using the elevated plus maze, the sucrose preference test, and the open field test in male rats with single prolonged stress (SPS) induced-PTSD. The expression of orexin-A in the hypothalamus and orexin receptors (OX1R and OX2R) in the mPFC was detected and quantified by immunohistochemistry, western blotting, and real-time polymerase chain reaction. We found that the SPS rats exhibited enhanced levels of anxiety, reduced exploratory activities, and anhedonia. Furthermore, SPS resulted in reductions in the expression of orexin-A in the hypothalamus and the increased the expression of OX1R in the mPFC. The intracerebroventricular administration of orexin-A alleviated behavioral changes in SPS rats and partly restored the increased levels of OX1R in the mPFC. These results suggest that the orexin system plays a role in the anxiety- and depression-related symptoms observed in PTSD.
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Affiliation(s)
- Dan Han
- PTSD Laboratory, Department of Histology and Embryology, Basic Medical Sciences College, China Medical University, Shenyang, China.,Department of Neonatology, The First Hospital of China Medical University, Shenyang, China
| | - Yuxiu Shi
- PTSD Laboratory, Department of Histology and Embryology, Basic Medical Sciences College, China Medical University, Shenyang, China
| | - Fang Han
- PTSD Laboratory, Department of Histology and Embryology, Basic Medical Sciences College, China Medical University, Shenyang, China
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6
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Yang F, Liu Y, Chen S, Dai Z, Yang D, Gao D, Shao J, Wang Y, Wang T, Zhang Z, Zhang L, Lu WW, Li Y, Wang L. A GABAergic neural circuit in the ventromedial hypothalamus mediates chronic stress-induced bone loss. J Clin Invest 2021; 130:6539-6554. [PMID: 32910804 DOI: 10.1172/jci136105] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Accepted: 08/26/2020] [Indexed: 12/25/2022] Open
Abstract
Homeostasis of bone metabolism is regulated by the central nervous system, and mood disorders such as anxiety are associated with bone metabolism abnormalities, yet our understanding of the central neural circuits regulating bone metabolism is limited. Here, we demonstrate that chronic stress in crewmembers resulted in decreased bone density and elevated anxiety in an isolated habitat mimicking a space station. We then used a mouse model to demonstrate that GABAergic neural circuitry in the ventromedial hypothalamus (VMH) mediates chronic stress-induced bone loss. We show that GABAergic inputs in the dorsomedial VMH arise from a specific group of somatostatin neurons in the posterior region of the bed nucleus of the stria terminalis, which is indispensable for stress-induced bone loss and is able to trigger bone loss in the absence of stressors. In addition, the sympathetic system and glutamatergic neurons in the nucleus tractus solitarius were employed to regulate stress-induced bone loss. Our study has therefore identified the central neural mechanism by which chronic stress-induced mood disorders, such as anxiety, influence bone metabolism.
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Affiliation(s)
- Fan Yang
- Brain Cognition and Brain Disease Institute, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences (CAS).,CAS Key Laboratory of Brain Connectome and Manipulation.,Guangdong Provincial Key Laboratory of Brain Connectome and Behavior.,Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Yunhui Liu
- Brain Cognition and Brain Disease Institute, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences (CAS).,CAS Key Laboratory of Brain Connectome and Manipulation.,Guangdong Provincial Key Laboratory of Brain Connectome and Behavior.,Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Shanping Chen
- Brain Cognition and Brain Disease Institute, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences (CAS).,CAS Key Laboratory of Brain Connectome and Manipulation.,Guangdong Provincial Key Laboratory of Brain Connectome and Behavior.,Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Zhongquan Dai
- State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China
| | - Dazhi Yang
- Department of Orthopedics, Union Shenzhen Hospital, Huazhong University of Science and Technology, Shenzhen, China
| | - Dashuang Gao
- Brain Cognition and Brain Disease Institute, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences (CAS).,CAS Key Laboratory of Brain Connectome and Manipulation.,Guangdong Provincial Key Laboratory of Brain Connectome and Behavior.,Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Jie Shao
- Brain Cognition and Brain Disease Institute, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences (CAS).,CAS Key Laboratory of Brain Connectome and Manipulation.,Guangdong Provincial Key Laboratory of Brain Connectome and Behavior.,Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Yuyao Wang
- Brain Cognition and Brain Disease Institute, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences (CAS).,CAS Key Laboratory of Brain Connectome and Manipulation.,Guangdong Provincial Key Laboratory of Brain Connectome and Behavior.,Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen, China
| | - Ting Wang
- Brain Cognition and Brain Disease Institute, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences (CAS).,CAS Key Laboratory of Brain Connectome and Manipulation.,Guangdong Provincial Key Laboratory of Brain Connectome and Behavior.,Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen, China
| | - Zhijian Zhang
- Center for Brain Science, Key Laboratory of Magnetic Resonance in Biological Systems and State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, CAS, Wuhan, China.,Center for Excellence in Brain Science and Intelligence Technology, CAS, Shanghai, China
| | - Lu Zhang
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, China
| | - William W Lu
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, China
| | - Yinghui Li
- State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China
| | - Liping Wang
- Brain Cognition and Brain Disease Institute, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences (CAS).,CAS Key Laboratory of Brain Connectome and Manipulation.,Guangdong Provincial Key Laboratory of Brain Connectome and Behavior.,Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen, China.,University of Chinese Academy of Sciences, Beijing, China
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7
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Dunietz GL, Vanini G, Shannon C, O'Brien LM, Chervin RD. Associations of plasma hypocretin-1 with metabolic and reproductive health: Two systematic reviews of clinical studies. Sleep Med Rev 2020; 52:101307. [PMID: 32259696 PMCID: PMC7351596 DOI: 10.1016/j.smrv.2020.101307] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 01/30/2020] [Accepted: 01/31/2020] [Indexed: 12/11/2022]
Abstract
The hypocretin system consists of two peptides hypocretin-1 and hypocretin-2 (HCRT1 and HCRT2). Hypocretin-containing neurons are located in the posterior and lateral hypothalamus, and have widespread projections throughout the brain and spinal cord. In addition to its presence in the cerebrospinal fluid (CSF), peripheral HCRT1 has been detected in plasma. Robust experimental evidence demonstrates functions of hypothalamic-originated HCRT1 in regulation of multiple biological systems related to sleep-wake states, energy homeostasis and endocrine function. In contrast, HCRT1 studies with human participants are limited by the necessarily invasive assessment of CSF HCRT1 to patients with underlying morbidity. Regulation by HCRT1 of energy homeostasis and reproduction in animals suggests similar regulation in humans and prompts these two systematic reviews. These reviews translate prior experimental findings from animal studies to humans and examine associations between HCRT1 and: 1) metabolic risk factors; 2) reproductive function in men, women and children. A total of 21 studies and six studies met the inclusion criteria for the two searches, respectively. Research question, study design, study population, assessments of HCRT1, reproductive, cardiometabolic data and main findings were extracted. Associations between HCRT1, metabolic and reproductive function are inconsistent. Limitations of studies and future research directions are outlined.
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Affiliation(s)
- Galit L Dunietz
- Division of Sleep Medicine, Department of Neurology, University of Michigan, Ann Arbor, MI, 48109, USA.
| | - Giancarlo Vanini
- Department of Anesthesiology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Carol Shannon
- Taubman Health Sciences Library, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Louise M O'Brien
- Division of Sleep Medicine, Department of Neurology, University of Michigan, Ann Arbor, MI, 48109, USA; Department of Obstetrics & Gynecology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Ronald D Chervin
- Division of Sleep Medicine, Department of Neurology, University of Michigan, Ann Arbor, MI, 48109, USA
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8
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Li W, Zhou X, Jiang T, He H, Wen T. Positive Effect of Gushukang on Type-H Vessel and Bone Formation. Front Cell Dev Biol 2020; 8:265. [PMID: 32671056 PMCID: PMC7326058 DOI: 10.3389/fcell.2020.00265] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Accepted: 03/30/2020] [Indexed: 12/26/2022] Open
Abstract
Gushukang (GSK) is a traditional herbal compound used in Chinese medicine for the treatment of osteoporosis. Numerous studies have been conducted to elucidate the effects of GSK, but the mechanisms underlying these effects remain unclear. In the present study, we cultured osteoblasts and osteoclasts with low and high doses of GSK, and also administered 3-month-old mice with 4 and 8 g/kg/day of GSK solution. Gushukang was found to promote osteoblast differentiation and inhibit osteoclast differentiation in vitro. In vivo, mice in the GSK treatment groups showed an increase in bone mass, as measured by micro-computed tomography (Micro-CT). Tartrate resistant acid phosphatase (TRAP) staining and osteocalcin (OCN) staining experiments revealed decreased bone resorption and increased bone formation in the GSK treatment groups. In addition, we found a novel effect of GSK—it could induce type-H vessel formation in mice. The underlying mechanisms of these actions were further explored at the molecular level to investigate whether these effects were due to an overexpression of the hypoxia inducible factor-1 (HIF-1α). Our findings indicate the utility of GSK as a therapeutic for the prevention of osteoporosis.
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Affiliation(s)
- Wantao Li
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, China
| | - Xiaoqing Zhou
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, China
| | - Tiejian Jiang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, China
| | - Hongbo He
- Department of Orthopedic, Xiangya Hospital of Central South University, Changsha, China
| | - Ting Wen
- Department of Orthopedic, Xiangya Hospital of Central South University, Changsha, China
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9
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Chang ET, Lin CL, Chen SF, Hsu CY, Shen YC. Risk of bone fractures in patients with narcolepsy: a nationwide population-based cohort study. Sleep Med 2020; 70:55-59. [PMID: 32197225 DOI: 10.1016/j.sleep.2020.02.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Revised: 02/05/2020] [Accepted: 02/14/2020] [Indexed: 12/18/2022]
Abstract
OBJECTIVES Narcolepsy symptoms, such as excessive daytime sleepiness or cataplexy, can pose a risk to safety. Stimulants or antidepressants have been used to treat these symptoms. The study investigated the risk of bone fractures in narcolepsy patients. Also, the exposure pattern of stimulants and antidepressants to the risk of bone fractures was examined. METHODS In all, 493 narcolepsy patients and 490 controls matched by gender, age, index year, and comorbidity severity were enrolled between 1998 and 2012, then followed until the end of 2013 using Taiwan's National Health Insurance Research Database. During the follow-up period, participants who developed bone fractures were identified. Cox regression analysis was used to calculate the hazard ratio (HR) with 95% confidence interval (CI) for the incidence rates of bone fractures between narcolepsy patients and unaffected controls. RESULTS Narcolepsy patients had a significantly increased risk of bone fractures compared with unaffected controls (19.6 versus 12.3 per 1000 person-years, HR: 1.74, 95% CI: 1.29-2.35). In addition, the use of stimulants in narcolepsy patients showed lower incidence rates of bone fractures compared to non-users (incidence rates were 14.2, 11.9, and 20.0 per 1000 person-years, respectively, among frequent users, infrequent users, and non-users), but the risk estimate was not statistically significant. The evidence for associations between antidepressant use in narcolepsy patients and bone fractures was contradictory. CONCLUSION This study highlights the need to pay attention to the risk of bone fractures in narcolepsy patients, and the importance of adequate stimulants use might reduce the risk of bone fractures.
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Affiliation(s)
- En-Ting Chang
- Department of Chest Medicine, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Hualien, Taiwan; School of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Cheng-Li Lin
- Management Office for Health Data, China Medical University Hospital, and College of Medicine, China Medical University, Taichung, Taiwan
| | - Shih-Fen Chen
- Center of Medical Genetics, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Hualien, Taiwan
| | - Chung-Y Hsu
- Graduate Institute of Clinical Medical Science, China Medical University, Taichung, Taiwan
| | - Yu-Chih Shen
- Department of Psychiatry, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Hualien, Taiwan; School of Medicine, Tzu Chi University, Hualien, Taiwan.
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10
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Xiong Y, Chen L, Yan C, Endo Y, Mi B, Liu G. The lncRNA Rhno1/miR-6979-5p/BMP2 Axis Modulates Osteoblast Differentiation. Int J Biol Sci 2020; 16:1604-1615. [PMID: 32226305 PMCID: PMC7097916 DOI: 10.7150/ijbs.38930] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 02/26/2020] [Indexed: 12/13/2022] Open
Abstract
The roles of long non-coding RNAs (lncRNAs) and micro RNAs (miRNAs) as regulators of mRNA expression in various diseases have recently been reported. Osteoblast differentiation is the vital process which mediates bone formation and fracture healing. In present study, we found microRNA-6979-5p (miR-6979-5p) to be the most differentially expressed miRNA between normal bone and calluses of mice, and overexpression of miR-6979-5p was negatively associated with osteoblast differentiation. Through luciferase assays, we found evidence that bone morphogenetic protein 2 (BMP2) is a miR-6979-5p target gene that positively regulates osteoblast differentiation. We further identified the lncRNA Rhno1 as a competing endogenous RNA (ceRNA) of miR-6979-5p, and we verified that it was able to influence osteoblast differentiation both in vitro and in vivo. In summary, our data indicates that the lncRNA Rhno1/miR-6979-5p/BMP2 axis is a significant regulatory mechanism controlling osteoblast differentiation, and it may thus offer a novel therapeutic strategy for fracture healing.
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Affiliation(s)
- Yuan Xiong
- Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Lang Chen
- Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Chenchen Yan
- Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Yori Endo
- Division of Plastic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, 02215, USA
| | - Bobin Mi
- Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Guohui Liu
- Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
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11
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Assadi MH, Segev Y, Tarasiuk A. Upper Airway Obstruction Elicited Energy Imbalance Leads to Growth Retardation that Persists after the Obstruction Removal. Sci Rep 2020; 10:3206. [PMID: 32081973 PMCID: PMC7035324 DOI: 10.1038/s41598-020-60226-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Accepted: 01/08/2020] [Indexed: 12/28/2022] Open
Abstract
Upper airway obstruction can lead to growth retardation by unclear mechanisms. We explored the effect of upper airway obstruction in juvenile rats on whole-body energy balance, growth plate metabolism, and growth. We show that after seven weeks, obstructed animals’ ventilation during room air breathing increased, and animals grew less due to abnormal growth plate metabolism. Increased caloric intake in upper airway-obstructed animals did not meet increased energy expenditure associated with increased work of breathing. Decreased whole-body energy balance induced hindrance of bone elongation following obstruction removal, and array pathways regulating growth plate development and marrow adiposity. This is the first study to show that rapidly growing animals cannot consume enough calories to maintain their energy homeostasis, leading to an impediment in growth in the effort to save energy.
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Affiliation(s)
- Mohammad H Assadi
- Sleep-Wake Disorders Unit, Soroka University Medical Center, P.O. Box 151, Beer-Sheva, 84105, Israel.,Shraga Segal Department of Microbiology and Immunology, Ben-Gurion University of the Negev, P.O. Box 105, Beer-Sheva, 84105, Israel
| | - Yael Segev
- Shraga Segal Department of Microbiology and Immunology, Ben-Gurion University of the Negev, P.O. Box 105, Beer-Sheva, 84105, Israel
| | - Ariel Tarasiuk
- Sleep-Wake Disorders Unit, Soroka University Medical Center, P.O. Box 151, Beer-Sheva, 84105, Israel. .,Department of Physiology, Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O. Box 105, Beer-Sheva, 84105, Israel.
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12
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Kakizaki M, Tsuneoka Y, Takase K, Kim SJ, Choi J, Ikkyu A, Abe M, Sakimura K, Yanagisawa M, Funato H. Differential Roles of Each Orexin Receptor Signaling in Obesity. iScience 2019; 20:1-13. [PMID: 31546102 PMCID: PMC6817686 DOI: 10.1016/j.isci.2019.09.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 08/04/2019] [Accepted: 09/03/2019] [Indexed: 02/04/2023] Open
Abstract
Orexins are hypothalamic neuropeptides that regulate feeding, energy expenditure, and sleep. Although orexin-deficient mice are susceptible to obesity, little is known about the roles of the orexin receptors in long-term energy metabolism. Here, we performed the metabolic characterization of orexin receptor-deficient mice. Ox1r-deficient mice were resistant to diet-induced obesity, and their food intake was similar between chow and high-fat food. Ox2r-deficient mice exhibited less energy expenditure than wild-type mice when fed a high-fat diet. Neither Ox1r-deficient nor Ox2r-deficient mice showed body weight gain similar to orexin-deficient mice. Although the presence of a running wheel suppressed diet-induced obesity in wild-type mice, the effect was weaker in orexin neuron-ablated mice. Finally, we did not detect abnormalities in brown adipose tissues of orexin-deficient mice. Thus, each orexin receptor signaling has a unique role in energy metabolism, and orexin neurons are involved in the interactive effect of diet and exercise on body weight gain. Food intakes of Ox1r-deficient mice are similar between chow and high-fat food Ox2r-deficient mice exhibit less energy expenditure when fed a high-fat diet Orexin neurons are involved in the interactive effect of diet and exercise Orexin-deficient mice have normal brown adipose tissue
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Affiliation(s)
- Miyo Kakizaki
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Yousuke Tsuneoka
- Department of Anatomy, Faculty of Medicine, Toho University, Ota-ku, Tokyo 143-8540, Japan
| | - Kenkichi Takase
- Department of Anatomy, Faculty of Medicine, Toho University, Ota-ku, Tokyo 143-8540, Japan; Laboratory of Psychology, Jichi Medical University, Shimotsuke, Tochigi 329-0498, Japan
| | - Staci J Kim
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Jinhwan Choi
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Aya Ikkyu
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Manabu Abe
- Department of Cellular Neurobiology, Brain Research Institute, Niigata University, Niigata 951-8585, Japan; Department of Animal Model Development, Brain Research Institute, Niigata University, Niigata 951-8585, Japan
| | - Kenji Sakimura
- Department of Cellular Neurobiology, Brain Research Institute, Niigata University, Niigata 951-8585, Japan; Department of Animal Model Development, Brain Research Institute, Niigata University, Niigata 951-8585, Japan
| | - Masashi Yanagisawa
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan; Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, Tsukuba, 305-8575 Ibaraki, Japan; Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
| | - Hiromasa Funato
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan; Department of Anatomy, Faculty of Medicine, Toho University, Ota-ku, Tokyo 143-8540, Japan.
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13
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Wee NKY, Lorenz MR, Bekirov Y, Jacquin MF, Scheller EL. Shared Autonomic Pathways Connect Bone Marrow and Peripheral Adipose Tissues Across the Central Neuraxis. Front Endocrinol (Lausanne) 2019; 10:668. [PMID: 31611846 PMCID: PMC6776593 DOI: 10.3389/fendo.2019.00668] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 09/16/2019] [Indexed: 12/31/2022] Open
Abstract
Bone marrow adipose tissue (BMAT) is increased in both obesity and anorexia. This is unique relative to white adipose tissue (WAT), which is generally more attuned to metabolic demand. It suggests that there may be regulatory pathways that are common to both BMAT and WAT and also those that are specific to BMAT alone. The central nervous system (CNS) is a key mediator of adipose tissue function through sympathetic adrenergic neurons. Thus, we hypothesized that central autonomic pathways may be involved in BMAT regulation. To test this, we first quantified the innervation of BMAT by tyrosine hydroxylase (TH) positive nerves within the metaphysis and diaphysis of the tibia of B6 and C3H mice. We found that many of the TH+ axons were concentrated around central blood vessels in the bone marrow. However, there were also areas of free nerve endings which terminated in regions of BMAT adipocytes. Overall, the proportion of nerve-associated BMAT adipocytes increased from proximal to distal along the length of the tibia (from ~3-5 to ~14-24%), regardless of mouse strain. To identify the central pathways involved in BMAT innervation and compare to peripheral WAT, we then performed retrograde viral tract tracing with an attenuated pseudorabies virus (PRV) to infect efferent nerves from the tibial metaphysis (inclusive of BMAT) and inguinal WAT (iWAT) of C3H mice. PRV positive neurons were identified consistently from both injection sites in the intermediolateral horn of the spinal cord, reticular formation, rostroventral medulla, solitary tract, periaqueductal gray, locus coeruleus, subcoeruleus, Barrington's nucleus, and hypothalamus. We also observed dual-PRV infected neurons within the majority of these regions. Similar tracings were observed in pons, midbrain, and hypothalamic regions from B6 femur and tibia, demonstrating that these results persist across mouse strains and between skeletal sites. Altogether, this is the first quantitative report of BMAT autonomic innervation and reveals common central neuroanatomic pathways, including putative "command" neurons, involved in coordinating multiple aspects of sympathetic output and facilitation of parallel processing between bone marrow/BMAT and peripheral adipose tissue.
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Affiliation(s)
- Natalie K. Y. Wee
- Division of Bone and Mineral Diseases, Department of Medicine, Washington University School of Medicine, St. Louis, MO, United States
- Department of Reconstructive Sciences, UConn Health, Farmington, CT, United States
| | - Madelyn R. Lorenz
- Division of Bone and Mineral Diseases, Department of Medicine, Washington University School of Medicine, St. Louis, MO, United States
| | - Yusuf Bekirov
- Division of Bone and Mineral Diseases, Department of Medicine, Washington University School of Medicine, St. Louis, MO, United States
| | - Mark F. Jacquin
- Department of Neurology, Washington University School of Medicine, St. Louis, MO, United States
| | - Erica L. Scheller
- Division of Bone and Mineral Diseases, Department of Medicine, Washington University School of Medicine, St. Louis, MO, United States
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO, United States
- *Correspondence: Erica L. Scheller
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Yi SS, Chung SH, Kim PS. Sharing Pathological Mechanisms of Insomnia and Osteoporosis, and a New Perspective on Safe Drug Choice. J Menopausal Med 2018; 24:143-149. [PMID: 30671405 PMCID: PMC6336562 DOI: 10.6118/jmm.2018.24.3.143] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Revised: 11/08/2018] [Accepted: 11/16/2018] [Indexed: 12/27/2022] Open
Abstract
Lack of adequate sleep has become increasingly common in our 24/7 modern society. Reduced sleep has significant health consequences including metabolic and cardiovascular disorders, and mental problems including depression. In addition, although the increase in life expectancy has provided a dream of longevity to humans, the occurrence of osteoporosis is a big obstacle to this dream for both male and female. It is known that insomnia and bone health problems, which are very critical conditions in human life, interestingly, share a lot of pathogenesis in recent decades. Nevertheless, due to another side effects of the synthetic drugs being taken for the treatment of insomnia and osteoporosis, patients have substantial anxiety for the safety of drugs with therapeutic expectation. This review examines the pathogenesis shared by sleep and osteoporosis together and herbal medicine, which has recently been shown to be safe and efficacious in the treatment of both diseases other than synthetic drugs. We suggestions for how to treat osteoporosis. These efforts will be the first step toward enabling patients to have comfortable and safe prescriptions through a wide selection of therapeutic agents in the future.
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Affiliation(s)
- Sun Shin Yi
- Department of Biomedical Laboratory Science, College of Medical Sciences, Soonchunhyang University, Asan, Korea
| | - Soo-Ho Chung
- Department of Obstetrics and Gynecology, Soonchunhyang University College of Medicine, Bucheon, Korea
| | - Pan Soo Kim
- Bio-Center, Gyeonggido Business and Science Accelerator, Suwon, Korea
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Mera P, Ferron M, Mosialou I. Regulation of Energy Metabolism by Bone-Derived Hormones. Cold Spring Harb Perspect Med 2018; 8:cshperspect.a031666. [PMID: 28778968 DOI: 10.1101/cshperspect.a031666] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Like many other organs, bone can act as an endocrine organ through the secretion of bone-specific hormones or "osteokines." At least two osteokines are implicated in the control of glucose and energy metabolism: osteocalcin (OCN) and lipocalin-2 (LCN2). OCN stimulates the production and secretion of insulin by the pancreatic β-cells, but also favors adaptation to exercise by stimulating glucose and fatty acid (FA) utilization by the muscle. Both of these OCN functions are mediated by the G-protein-coupled receptor GPRC6A. In contrast, LCN2 influences energy metabolism by activating appetite-suppressing signaling in the brain. This action of LCN2 occurs through its binding to the melanocortin 4 receptor (MC4R) in the paraventricular nucleus of the hypothalamus (PVN) and ventromedial neurons of the hypothalamus.
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Affiliation(s)
- Paula Mera
- Columbia University Medical Center, New York, New York 10032
| | - Mathieu Ferron
- Institut de Recherches Cliniques de Montréal, Montréal, Quebec H2W 1R7, Canada
| | - Ioanna Mosialou
- Columbia University Medical Center, New York, New York 10032
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16
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Huynh H, Wan Y. mTORC1 impedes osteoclast differentiation via calcineurin and NFATc1. Commun Biol 2018; 1:29. [PMID: 30271915 PMCID: PMC6123628 DOI: 10.1038/s42003-018-0028-4] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 03/06/2018] [Indexed: 12/26/2022] Open
Abstract
Rapamycins are immunosuppressant and anti-cancer drugs that inhibit the kinase mTOR. Clinically, they often cause bone pain, bone necrosis, and high bone turnover, yet the mechanisms are unclear. Here we show that mTORC1 activity is high in osteoclast precursors but downregulated upon RANKL treatment. Loss-of-function genetic models reveal that while early Raptor deletion in hematopoietic stem cells blunts osteoclastogenesis due to compromised proliferation/survival, late Raptor deletion in osteoclast precursors instead augments osteoclastogenesis. Gain-of-function genetic models by TSC1 deletion in HSCs or osteoclast precursors cause constitutive mTORC1 activation, impairing osteoclastogenesis. Pharmacologically, rapamycin treatment at low but clinically relevant doses exacerbates osteoclast differentiation and bone resorption, leading to bone loss. Mechanistically, RANKL inactivates mTORC1 via calcineurin-mediated mTORC1 dephosphorylation, consequently activating NFATc1 by reducing mTORC1-mediated NFATc1 phosphorylation. These findings uncover biphasic roles of mTORC1 in osteoclastogenesis, dosage-dependent effects of rapamycin on bone, and a previously unrecognized calcineurin-mTORC1-NFATc1 phosphorylation-regulatory signaling cascade.
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Affiliation(s)
- HoangDinh Huynh
- Department of Pharmacology, The University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA
| | - Yihong Wan
- Department of Pharmacology, The University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA.
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17
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Liu DM, Zhao HY, Zhao L, Zhang MJ, Liu TT, Tao B, Sun LH, Liu JM. The relationship among serum lipocalin 2, bone turnover markers, and bone mineral density in outpatient women. Endocrine 2018; 59:304-310. [PMID: 29294226 DOI: 10.1007/s12020-017-1504-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 12/14/2017] [Indexed: 11/28/2022]
Abstract
PURPOSE We aimed to investigate associations among serum levels of LCN2, bone resorption marker carboxy-terminal cross-linking telopeptide of type-1 collagen (CTx), bone formation marker osteocalcin (OCN), and bone mineral densities (BMDs) in ambulatory healthy women. METHODS This cross-sectional study analyzed 1012 previously enrolled outpatient Han Chinese women. BMDs of the lumbar spine and femoral neck were measured using dual energy X-ray absorptiometry. Serum levels of LCN2, CTx, OCN, and creatinine (Scr) were measured. RESULTS Circulating LCN2 was inversely correlated with BMDs at the lumbar spine and femoral neck (Spearman's r = -0.08, P = 0.010 and r = -0.14, P < 0.001; respectively). A significant positive correlation between LCN2 and CTx (r = 0.11, P < 0.001), OCN (r = 0.06, P = 0.047), age (r = 0.21, P < 0.001), and Scr (r = 0.24, P < 0.001) was also observed. After adjusting for age and Scr, the correlation among LCN2, BMDs and OCN disappeared, but LCN2 was still positively associated with CTx (r = 0.08, P = 0.010). The circulating concentration of LCN2 showed no significant difference between subjects with and without osteoporotic fractures (43.63 (35.29, 53.66) vs. 42.25 (34.43, 51.46) ng/ml, respectively, P = 0.111). Serum CTx concentrations rose with serum LCN2 increasing from the lowest to the highest quartile (P for trend = 0.005), even after adjusting for age and Scr (P for trend = 0.040). In multivariate regression analysis, LCN2 was one of the main determinants for changes in serum CTx (standard β = 0.061, P = 0.005). CONCLUSIONS In ambulatory healthy women, the relationships among serum LCN2 level, BMDs, and OCN were confounded by age and Scr. Although LCN2 was positively related with CTx, the correlation was very weak and may not be physiologically relevant.
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Affiliation(s)
- Dong-Mei Liu
- Department of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Rui-jin Hospital, Shanghai Jiao-tong University School of Medicine, Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai, 200025, China
- Department of Rheumatology, ZhongShan Hospital, FuDan University, Shanghai, China
| | - Hong-Yan Zhao
- Department of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Rui-jin Hospital, Shanghai Jiao-tong University School of Medicine, Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai, 200025, China
| | - Lin Zhao
- Department of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Rui-jin Hospital, Shanghai Jiao-tong University School of Medicine, Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai, 200025, China
| | - Min-Jia Zhang
- Department of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Rui-jin Hospital, Shanghai Jiao-tong University School of Medicine, Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai, 200025, China
| | - Ting-Ting Liu
- Department of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Rui-jin Hospital, Shanghai Jiao-tong University School of Medicine, Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai, 200025, China
| | - Bei Tao
- Department of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Rui-jin Hospital, Shanghai Jiao-tong University School of Medicine, Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai, 200025, China
| | - Li-Hao Sun
- Department of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Rui-jin Hospital, Shanghai Jiao-tong University School of Medicine, Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai, 200025, China
| | - Jian-Min Liu
- Department of Endocrine and Metabolic Diseases, Shanghai Clinical Center for Endocrine and Metabolic Diseases, Rui-jin Hospital, Shanghai Jiao-tong University School of Medicine, Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai, 200025, China.
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Tarasiuk A, Segev Y. Abnormal Growth and Feeding Behavior in Upper Airway Obstruction in Rats. Front Endocrinol (Lausanne) 2018; 9:298. [PMID: 29915561 PMCID: PMC5994397 DOI: 10.3389/fendo.2018.00298] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 05/18/2018] [Indexed: 12/18/2022] Open
Abstract
Pediatric obstructive sleep apnea (OSA) is a syndrome manifesting with snoring and increased respiratory effort due to increased upper airway resistance. In addition to cause the abnormal sleep, this syndrome has been shown to elicit either growth retardation or metabolic syndrome and obesity. Treating OSA by adenotonsillectomy is usually associated with increased risk for obesity, despite near complete restoration of breathing and sleep. However, the underlying mechanism linking upper airways obstruction (AO) to persistent change in food intake, metabolism, and growth remains unclear. Rodent models have examined the impact of intermittent hypoxia on metabolism. However, an additional defining feature of OSA that is not related to intermittent hypoxia is enhanced respiratory loading leading to increased respiratory effort and abnormal sleep. The focus of this mini review is on recent evidence indicating the persistent abnormalities in endocrine regulation of feeding and growth that are not fully restored by the chronic upper AO removal in rats. Here, we highlight important aspects related to abnormal regulation of metabolism that are not related to intermittent hypoxia per se, in an animal model that mimics many of the clinical features of pediatric OSA. Our evidence from the AO model indicates that obstruction removal may not be sufficient to prevent the post-removal tendency for abnormal growth.
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Affiliation(s)
- Ariel Tarasiuk
- Sleep-Wake Disorders Unit, Soroka University Medical Center, Beer-Sheva, Israel
- Department of Physiology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- *Correspondence: Ariel Tarasiuk,
| | - Yael Segev
- Shraga Segal Department of Microbiology and Immunology, Ben-Gurion University of the Negev, Beer-Sheva, Israel
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Tarasiuk A, Levi A, Assadi MH, Troib A, Segev Y. Orexin Plays a Role in Growth Impediment Induced by Obstructive Sleep Breathing in Rats. Sleep 2016; 39:887-97. [PMID: 26943473 DOI: 10.5665/sleep.5648] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Accepted: 12/16/2015] [Indexed: 01/17/2023] Open
Abstract
STUDY OBJECTIVES The mechanisms linking sleep disordered breathing with impairment of sleep and bone metabolism/architecture are poorly understood. Here, we explored the role of the neuropeptide orexin, a respiratory homeostasis modulator, in growth retardation induced in an upper airway obstructed (AO) rat model. METHODS The tracheae of 22-day-old rats were narrowed; AO and sham-control animals were monitored for 5 to 7 w. Growth parameters, food intake, sleep/wake activity, and serum hormones were measured. After euthanasia, growth plate (GP) histology, morphometry, orexin receptors (OXR), and related mediators were analyzed. The effect of dual orexin receptor antagonist (almorexant 300 mg/kg) on sleep and GP histology were also investigated. RESULTS The AO group slept 32% less; the time spent in slow wave and paradoxical sleep during light period and slow wave activity was reduced. The AO group gained 46% less body weight compared to the control group, despite elevated food intake; plasma ghrelin increased by 275% and leptin level decreased by 44%. The impediment of bone elongation and bone mass was followed by a 200% increase in OX1R and 38% reduction of local GP ghrelin proteins and growth hormone secretagogue receptor 1a. Sry-related transcription factor nine (Sox9), a molecule mediating cartilage ossification, was downregulated and the level of transcription factor peroxisome proliferator-activated receptor gamma was upregulated, explaining the bone architecture abnormalities. Administration of almorexant restored sleep and improved GP width in AO animals. CONCLUSIONS In AO animals, enhanced expression of orexin and OX1R plays a role in respiratory induced sleep and growth abnormalities.
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Affiliation(s)
- Ariel Tarasiuk
- Shraga Segal Department of Microbiology and Immunology, Ben-Gurion University of the Negev, Beer-Sheva, Israel.,Sleep-Wake Disorders Unit, Soroka University Medical Center, Beer-Sheva, Israel.,Department of Physiology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Avishag Levi
- Shraga Segal Department of Microbiology and Immunology, Ben-Gurion University of the Negev, Beer-Sheva, Israel.,Department of Physiology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Mohammad H Assadi
- Shraga Segal Department of Microbiology and Immunology, Ben-Gurion University of the Negev, Beer-Sheva, Israel.,Department of Physiology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Ariel Troib
- Shraga Segal Department of Microbiology and Immunology, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Yael Segev
- Shraga Segal Department of Microbiology and Immunology, Ben-Gurion University of the Negev, Beer-Sheva, Israel
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20
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Amso Z, Cornish J, Brimble MA. Short Anabolic Peptides for Bone Growth. Med Res Rev 2016; 36:579-640. [DOI: 10.1002/med.21388] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2015] [Revised: 01/24/2016] [Accepted: 02/15/2016] [Indexed: 12/11/2022]
Affiliation(s)
- Zaid Amso
- School of Chemical Sciences; The University of Auckland, 23 Symonds St; Auckland 1142 New Zealand
| | - Jillian Cornish
- Department of Medicine; The University of Auckland; Auckland 1010 New Zealand
| | - Margaret A. Brimble
- School of Chemical Sciences; The University of Auckland, 23 Symonds St; Auckland 1142 New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, School of Biological Sciences; The University of Auckland; Auckland 1142 New Zealand
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21
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Li X, Wei W, Huynh H, Zuo H, Wang X, Wan Y. Nur77 prevents excessive osteoclastogenesis by inducing ubiquitin ligase Cbl-b to mediate NFATc1 self-limitation. eLife 2015; 4:e07217. [PMID: 26173181 PMCID: PMC4518709 DOI: 10.7554/elife.07217] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Accepted: 07/13/2015] [Indexed: 01/18/2023] Open
Abstract
Osteoclasts are bone-resorbing cells essential for skeletal remodeling. However, over-active osteoclasts can cause bone-degenerative disorders. Therefore, the level of NFATc1, the master transcription factor of osteoclast, must be tightly controlled. Although the activation and amplification of NFATc1 have been extensively studied, how NFATc1 signaling is eventually resolved is unclear. Here, we uncover a novel and critical role of the orphan nuclear receptor Nur77 in mediating an NFATc1 self-limiting regulatory loop to prevent excessive osteoclastogenesis. Nur77 deletion leads to low bone mass owing to augmented osteoclast differentiation and bone resorption. Mechanistically, NFATc1 induces Nur77 expression at late stage of osteoclast differentiation; in turn, Nur77 transcriptionally up-regulates E3 ubiquitin ligase Cbl-b, which triggers NFATc1 protein degradation. These findings not only identify Nur77 as a key player in osteoprotection and a new therapeutic target for bone diseases, but also elucidate a previously unrecognized NFATc1→Nur77→Cblb—•NFATc1 feedback mechanism that confers NFATc1 signaling autoresolution. DOI:http://dx.doi.org/10.7554/eLife.07217.001 Bones are constantly remodeled in response to the stresses of everyday life. Cells called osteoclasts break down old or damaged bone and cells called osteoblasts make new bone. In healthy bones, the work of these two types of cells is well balanced. But in bone-weakening diseases like osteoporosis and certain bone cancers this balance is disturbed and the osteoclasts become overly active, leading to weak and thin bones. Some drugs can help block the development of osteoclasts and help reduce bone loss in these diseases, but they may cause unwanted side effects. A better understanding of the processes that maintain a healthy balance of osteoblasts and osteoclasts could help scientists develop better treatments with fewer side effects. Scientists have already learned that a protein called NFATc1 turns on the production of osteoclasts. But no one knew how NFATc1 is turned off in healthy bone to prevent the excessive growth of osteoclasts and too much bone turnover. Now, Li et al. have identified a protein called Nur77 as an important regulator of NFATc1 by examining genetically engineered mice that lack Nur77. These modified mice had more osteoclasts and thinner bones than normal mice. Further experiments used radiation to wipe out the bone marrow of normal mice, who then received bone marrow transplants from mice that lacked Nur77. After the transplant, the normal mice showed bone loss. When the experiment was reversed, and Nur77-lacking mice received bone marrow from normal mice, their bone loss was alleviated. This indicates that Nur77 acts in the bone marrow cells to control osteoclasts and skeletal health. Li et al. found that Nur77 cannot control the expression of the gene that encodes NFATc1 or directly bind to the NFATc1 protein. Instead, Nur77 increases the production of an enzyme that breaks down the NFATc1 protein. Unexpectedly, the experiments also found that NFATc1 turns on the expression of Nur77. This means that NFATc1 essentially regulates itself by increasing its own breakdown when NFATc1 levels increase. This helps to explain how osteoclast production is normally kept in check, and may suggest new strategies for treating bone diseases. DOI:http://dx.doi.org/10.7554/eLife.07217.002
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Affiliation(s)
- Xiaoxiao Li
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, United States
| | - Wei Wei
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, United States
| | - HoangDinh Huynh
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, United States
| | - Hao Zuo
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, United States
| | - Xueqian Wang
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, United States
| | - Yihong Wan
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, United States
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22
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Lemus MB, Bayliss JA, Lockie SH, Santos VV, Reichenbach A, Stark R, Andrews ZB. A stereological analysis of NPY, POMC, Orexin, GFAP astrocyte, and Iba1 microglia cell number and volume in diet-induced obese male mice. Endocrinology 2015; 156:1701-13. [PMID: 25742051 DOI: 10.1210/en.2014-1961] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The hypothalamic arcuate nucleus (ARC) contains 2 key neural populations, neuropeptide Y (NPY) and proopiomelanocortin (POMC), and, together with orexin neurons in the lateral hypothalamus, plays an integral role in energy homeostasis. However, no studies have examined total neuronal number and volume after high-fat diet (HFD) exposure using sophisticated stereology. We used design-based stereology to estimate NPY and POMC neuronal number and volume, as well as glial fibrillary acidic protein (astrocyte marker) and ionized calcium-binding adapter molecule 1 (microglia marker) cell number in the ARC; as well as orexin neurons in the lateral hypothalamus. Stereological analysis indicated approximately 8000 NPY and approximately 9000 POMC neurons in the ARC, and approximately 7500 orexin neurons in the lateral hypothalamus. HFD exposure did not affect total neuronal number in any population. However, HFD significantly increased average NPY cell volume and affected NPY and POMC cell volume distribution. HFD reduced orexin cell volume but had a bimodal effect on volume distribution with increased cells at relatively small volumes and decreased cells with relatively large volumes. ARC glial fibrillary acidic protein cells increased after 2 months on a HFD, although no significant difference after 6 months on chow diet or HFD was observed. No differences in ARC ionized calcium-binding adapter molecule 1 cell number were observed in any group. Thus, HFD affects ARC NPY or POMC neuronal cell volume number not cell number. Our results demonstrate the importance of stereology to perform robust unbiased analysis of cell number and volume. These data should be an empirical baseline reference to which future studies are compared.
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Affiliation(s)
- Moyra B Lemus
- Department of Physiology, Monash University, Clayton, Victoria 3800, Australia
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23
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Abstract
Single-minded 1 (Sim1) is a basic helix-loop-helix Per-Arnt-Sim transcription factor that is important for neuronal development in the hypothalamus. Loss-of-function mutation of Sim1 causes early-onset obesity. However, it is unknown whether and how Sim1 regulates bone remodeling. In this study, we found that adult-onset Sim1 deletion increases bone formation, leading to high bone mass. In contrast, Sim1-overexpressing transgenic mice exhibit decreased bone formation and low bone mass. Sim1 does not directly regulate osteoblastogenesis, because bone marrow mesenchymal stem cells from Sim1 mutant mice display a normal capacity for osteoblast differentiation. Instead, Sim1 inhibits bone formation via stimulating the sympathetic nervous system, because sympathetic tone is decreased by Sim1 deletion but increased by Sim1 overexpression. Treatment with the β-adrenergic agonist isoproterenol effectively reverses the high bone mass in Sim1-knockout mice. These findings reveal Sim1 as a critical yet previously unrecognized modulator of skeletal homeostasis that functions through a central relay.
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Affiliation(s)
- Xunde Wang
- Departments of Pharmacology (X.W., W.W., Y.W.) and Internal Medicine (A.R.Z.) and Eugene McDermott Center for Human Growth and Development (A.R.Z.), The University of Texas Southwestern Medical Center, Dallas, Texas 75390
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24
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Wang Z, Liu S, Kakizaki M, Hirose Y, Ishikawa Y, Funato H, Yanagisawa M, Yu Y, Liu Q. Orexin/hypocretin activates mTOR complex 1 (mTORC1) via an Erk/Akt-independent and calcium-stimulated lysosome v-ATPase pathway. J Biol Chem 2014; 289:31950-31959. [PMID: 25278019 PMCID: PMC4231673 DOI: 10.1074/jbc.m114.600015] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Revised: 09/30/2014] [Indexed: 02/05/2023] Open
Abstract
The lack of the neuropeptide orexin, also known as hypocretin, results in narcolepsy, a chronic sleep disorder characterized by frequent sleep/cataplexy attacks and rapid eye movement sleep abnormalities. However, the downstream pathways of orexin signaling are not clearly understood. Here, we show that orexin activates the mTOR pathway, a central regulator of cell growth and metabolism, in the mouse brain and multiple recombinant cell lines that express the G protein-coupled receptors (GPCRs), orexin 1 receptor (OX1R) or orexin 2 receptor (OX2R). This orexin/GPCR-stimulated mTOR activation is sensitive to rapamycin, an inhibitor of mTOR complex 1 (mTORC1) but is independent of two well known mTORC1 activators, Erk and Akt. Rather, our studies indicate that orexin activates mTORC1 via extracellular calcium influx and the lysosome pathway involving v-ATPase and Rag GTPases. Moreover, a cytoplasmic calcium transient is sufficient to mimic orexin/GPCR signaling to mTORC1 activation in a v-ATPase-dependent manner. Together, our studies suggest that the mTORC1 pathway functions downstream of orexin/GPCR signaling, which plays a crucial role in many physiological and metabolic processes.
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Affiliation(s)
- Zhiqiang Wang
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - Shimeng Liu
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75390,; College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Miyo Kakizaki
- International Institute of Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Ibaraki 305-8575, Japan, and
| | - Yuuki Hirose
- International Institute of Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Ibaraki 305-8575, Japan, and
| | - Yukiko Ishikawa
- International Institute of Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Ibaraki 305-8575, Japan, and
| | - Hiromasa Funato
- International Institute of Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Ibaraki 305-8575, Japan, and; Department of Anatomy, Toho University School of Medicine, Tokyo 143-8540, Japan
| | - Masashi Yanagisawa
- International Institute of Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Ibaraki 305-8575, Japan, and
| | - Yonghao Yu
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75390,.
| | - Qinghua Liu
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75390,; International Institute of Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Ibaraki 305-8575, Japan, and.
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