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Cai X, Hu S, Liu W, Yin Y, Jiang Y, Wang Y, Lu B, Wang Y, Wang D, Chen J. Apelin Receptor Homodimerisation Inhibits Hippocampal Neuronal Autophagy via G Protein-Dependent Signalling in Vascular Dementia. Mol Neurobiol 2024:10.1007/s12035-024-04383-2. [PMID: 39042220 DOI: 10.1007/s12035-024-04383-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Accepted: 07/18/2024] [Indexed: 07/24/2024]
Abstract
Vascular dementia (VD), a progressive vascular cognitive impairment, is characterised by the presence of cerebral hypoperfusion, increased blood-brain barrier permeability, and white matter lesions. Although current treatment strategies primarily focus on risk factors such as hypertension, diabetes, and heart disease, efficient and targeted therapies are lacking and the underlying mechanisms of VD remain unclear. We previously discovered that Apelin receptors (APJ), which are G protein-coupled receptors (GPCRs), can homodimerize and generate signals that are distinct from those of APJ monomers in VD rats. Apelin-13 reduces the level of APJ homodimers and leads to the proliferation of endogenous neural stem cells in the hippocampal dentate gyrus area, suggesting that it has a neuroprotective role. In this study, we established a rat and cellular oxygen-glucose deprivation/reoxygenation VD model to investigate the impact of APJ homodimerisation on autophagy. We found that APJ homodimers protect against VD by inhibiting autophagy through the Gαq and PI3K/Akt/mTOR pathways upon Gαi signalling, both in vivo and in vitro. This discovery provides a promising therapeutic target for chronic cerebral ischaemia-reperfusion diseases and an experimental foundation for the development of drugs that target APJ homodimers.
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Affiliation(s)
- Xin Cai
- School of Basic Medical Sciences, Shandong Second Medical University, Weifang, Shandong, 261042, P.R. China
| | - Shujuan Hu
- School of Basic Medical Sciences, Shandong Second Medical University, Weifang, Shandong, 261042, P.R. China
| | - Wenkai Liu
- School of Basic Medical Sciences, Shandong Second Medical University, Weifang, Shandong, 261042, P.R. China
| | - Yue Yin
- School of Basic Medical Sciences, Shandong Second Medical University, Weifang, Shandong, 261042, P.R. China
| | - Yunlu Jiang
- Neurobiology Institute, Jining Medical University, Jining, Shandong, 272067, P.R. China
| | - Yixiang Wang
- School of Clinical Medicine, Shandong Second Medical University, Weifang, Shandong, 261042, P.R. China
| | - Bowen Lu
- School of Clinical Medicine, Shandong Second Medical University, Weifang, Shandong, 261042, P.R. China
| | - Yuliang Wang
- School of Basic Medical Sciences, Shandong Second Medical University, Weifang, Shandong, 261042, P.R. China
| | - Dexiu Wang
- School of Basic Medical Sciences, Shandong Second Medical University, Weifang, Shandong, 261042, P.R. China.
| | - Jing Chen
- Neurobiology Institute, Jining Medical University, Jining, Shandong, 272067, P.R. China.
- Division of Biomedical Sciences, Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK.
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Yang Y, Chen M, Qiu Y, Li X, Huang Y, Zhang W. The Apelin/APLNR system modulates tumor immune response by reshaping the tumor microenvironment. Gene X 2022; 834:146564. [PMID: 35598689 DOI: 10.1016/j.gene.2022.146564] [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: 03/08/2022] [Revised: 04/12/2022] [Accepted: 05/06/2022] [Indexed: 11/04/2022] Open
Abstract
Apelin is an endogenous ligand of the Apelin receptor (APLNR), a seven-transmembrane G protein-coupled receptor, which is widely distributed in human tissue. The Apelin/APLNR system is involved in regulating several physiological and pathological processes. The Apelin expression is increased in a variety of cancer and the Apelin/APLNR system could regulate the development of tumors through mediating autophagy, apoptosis, pyroptosis, and other biological processes to regulate tumor cell proliferation, migration, and invasion. The Apelin/APLNR system also participates in immune response and immune regulation through PI3K-Akt, ERK-MAPK, and other signal pathways. The latest research points out that there is a negative regulatory relationship between APLNR and immune checkpoint PD-L1. In this review, we outline the significance of the Apelin/APLNR signaling pathway in tumorigenesis and its immune regulation. These endeavors provide new insights into the translational application of Apelin/APLNR in cancer and may contribute to the promotion of more effective treatments for cancers.
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Affiliation(s)
- Yuqin Yang
- Department of Medical Laboratory Science, The Third Xiangya Hospital, Central South University, Changsha, Hunan Province 410013, PR China
| | - Meilin Chen
- Department of Medical Laboratory Science, The Third Xiangya Hospital, Central South University, Changsha, Hunan Province 410013, PR China
| | - Yanbing Qiu
- Department of Medical Laboratory Science, The Third Xiangya Hospital, Central South University, Changsha, Hunan Province 410013, PR China
| | - Xiaoxu Li
- Department of Medical Laboratory Science, The Third Xiangya Hospital, Central South University, Changsha, Hunan Province 410013, PR China
| | - Yumei Huang
- Department of Medical Laboratory Science, The Third Xiangya Hospital, Central South University, Changsha, Hunan Province 410013, PR China
| | - Wenling Zhang
- Department of Medical Laboratory Science, The Third Xiangya Hospital, Central South University, Changsha, Hunan Province 410013, PR China.
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Szczepanska-Sadowska E, Wsol A, Cudnoch-Jedrzejewska A, Żera T. Complementary Role of Oxytocin and Vasopressin in Cardiovascular Regulation. Int J Mol Sci 2021; 22:11465. [PMID: 34768894 PMCID: PMC8584236 DOI: 10.3390/ijms222111465] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 10/21/2021] [Accepted: 10/22/2021] [Indexed: 12/17/2022] Open
Abstract
The neurons secreting oxytocin (OXY) and vasopressin (AVP) are located mainly in the supraoptic, paraventricular, and suprachiasmatic nucleus of the brain. Oxytocinergic and vasopressinergic projections reach several regions of the brain and the spinal cord. Both peptides are released from axons, soma, and dendrites and modulate the excitability of other neuroregulatory pathways. The synthesis and action of OXY and AVP in the peripheral organs (eye, heart, gastrointestinal system) is being investigated. The secretion of OXY and AVP is influenced by changes in body fluid osmolality, blood volume, blood pressure, hypoxia, and stress. Vasopressin interacts with three subtypes of receptors: V1aR, V1bR, and V2R whereas oxytocin activates its own OXTR and V1aR receptors. AVP and OXY receptors are present in several regions of the brain (cortex, hypothalamus, pons, medulla, and cerebellum) and in the peripheral organs (heart, lungs, carotid bodies, kidneys, adrenal glands, pancreas, gastrointestinal tract, ovaries, uterus, thymus). Hypertension, myocardial infarction, and coexisting factors, such as pain and stress, have a significant impact on the secretion of oxytocin and vasopressin and on the expression of their receptors. The inappropriate regulation of oxytocin and vasopressin secretion during ischemia, hypoxia/hypercapnia, inflammation, pain, and stress may play a significant role in the pathogenesis of cardiovascular diseases.
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Affiliation(s)
- Ewa Szczepanska-Sadowska
- Laboratory of Centre for Preclinical Research, Chair and Department of Experimental and Clinical Physiology, Medical University of Warsaw, 02-091 Warsaw, Poland; (A.W.); (A.C.-J.); (T.Ż.)
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Wang D, Wang Y, Shan M, Chen J, Wang H, Sun B, Jin C, Li X, Yin Y, Song C, Xiao C, Li J, Wang T, Cai X. Apelin receptor homodimer inhibits apoptosis in vascular dementia. Exp Cell Res 2021; 407:112739. [PMID: 34343559 DOI: 10.1016/j.yexcr.2021.112739] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 07/09/2021] [Accepted: 07/13/2021] [Indexed: 11/30/2022]
Abstract
Apelin receptor (APJ), a member of family A of the G protein-coupled receptors (GPCRs), is a potential pharmaceutical target for diseases of the nervous system. Our previous work revealed that human APJ can form a homodimer that has different functional characteristics than the monomer. To investigate the effects of APJ homodimers on neuroprotection in vascular dementia (VD), we established VD model in rats and treated the animals by injecting apelin-13 into the lateral ventricle. In addition, we established an oxygen-glucose deprivation/reoxygenation (OGD/R) model in SH-SY5Y cells treated with apelin-13. After apelin-13 stimulation in the VD rat, the level of APJ and APJ homodimer were elevated. Furthermore, APJ homodimer decreased the level of cleaved caspase-3 and cleaved caspase-9 via the Gαi3 and Gαq signaling pathway, thereby increasing the number of neurons and inhibiting apoptosis. Consequently, APJ homodimers may serve as a unique mechanism for neuroprotection against VD and provide new pharmaceutical targets for VD.
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Affiliation(s)
- Dexiu Wang
- School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China
| | - Yuliang Wang
- School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China
| | - Meiyan Shan
- Department of Psychiatry, Shouguang Mental Health Center, Weifang, 261053, China
| | - Jing Chen
- Institute of Neurobiology, Jining Medical University, Rizhao, 276800, China; Division of Biomedical Sciences, Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK
| | - Huannan Wang
- Institute of Neurobiology, Jining Medical University, Rizhao, 276800, China
| | - Baoqi Sun
- Ophthalmology Department, Affiliated Hospital of Weifang Medical University, Weifang, 261053, China
| | - Chengwen Jin
- School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China
| | - Xin Li
- School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China
| | - Yue Yin
- School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China
| | - Chao Song
- School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China
| | - Changhao Xiao
- School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China
| | - Jianshe Li
- School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China
| | - Taiqian Wang
- School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China
| | - Xin Cai
- School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China.
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Zhou JX, Shuai NN, Wang B, Jin X, Kuang X, Tian SW. Neuroprotective gain of Apelin/APJ system. Neuropeptides 2021; 87:102131. [PMID: 33640616 DOI: 10.1016/j.npep.2021.102131] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 02/04/2021] [Accepted: 02/11/2021] [Indexed: 12/12/2022]
Abstract
Apelin is an endogenous ligand of G protein-coupled receptor APJ. In recent years, many studies have shown that the apelin/APJ system has neuroprotective properties, such as anti-inflammatory, anti-oxidative stress, anti-apoptosis, and regulating autophagy, blocking excitatory toxicity. Apelin/APJ system has been proven to play a role in various neurological diseases and may be a promising therapeutic target for nervous system diseases. In this paper, the neuroprotective properties of the apelin/APJ system and its role in neurologic disorders are reviewed. Further understanding of the pathophysiological effect and mechanism of the apelin/APJ system in the nervous system will help develop new therapeutic interventions for various neurological diseases.
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Affiliation(s)
- Jia-Xiu Zhou
- Department of Anesthesiology, Affiliated Longhua People's Hospital, Southern Medical University, Shenzhen, Guangdong 518109, PR China; Guangxi Key Laboratory of Brain and Cognitive Neuroscience, Faculty of Basic Medical Sciences, Faculty of Basic Medical Sciences, Guilin Medical University, Guilin, Guangxi 541199, PR China
| | - Nian-Nian Shuai
- Department of Anesthesiology, The First Affiliated Hospital, University of South China, Hengyang, Hunan 421001, PR China
| | - Bo Wang
- Department of Anesthesiology, The First Affiliated Hospital, University of South China, Hengyang, Hunan 421001, PR China
| | - Xin Jin
- Department of Anesthesiology, Nanhua Affiliated Hospital, University of South China, Hengyang, Hunan 421001, PR China
| | - Xin Kuang
- Department of Anesthesiology, Affiliated Longhua People's Hospital, Southern Medical University, Shenzhen, Guangdong 518109, PR China.
| | - Shao-Wen Tian
- Guangxi Key Laboratory of Brain and Cognitive Neuroscience, Faculty of Basic Medical Sciences, Faculty of Basic Medical Sciences, Guilin Medical University, Guilin, Guangxi 541199, PR China.
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Bhatt LK, Selokar I, Raut D, Hussain T. Novel Targets for Hypertension Drug Discovery. Curr Hypertens Rep 2021; 23:19. [PMID: 33783647 DOI: 10.1007/s11906-021-01137-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/18/2021] [Indexed: 01/21/2023]
Abstract
PURPOSE OF REVIEW Despite the availability of various medications and prescribing combination therapies, uncontrolled blood pressure and resistance are observed in more than 40% of patients. The purpose of this review is to discuss emerging novel approaches for the treatment of hypertension and propose future research and clinical directions. RECENT FINDINGS Hypertension is a common disease of the cardiovascular system which may arise solely or as a comorbidity of other disorders. It is a crucial risk factor for cardiovascular diseases such as coronary artery disease, myocardial infarction, congestive heart failure, renal failure, and stroke. The results from current literature regarding the novel approaches showed several targets that could be explored as potential therapeutic options. These include toll-like receptor 4, a critical regulator of angiotensin II-induced hypertension; protease-activated receptor 2, which promotes collagen deposition and inflammatory responses; chemerin, which causes metabolic and obesity-associated hypertension; apelin receptor; transient receptor potential melastatin; urotensin-II; and Tie2 receptor. This review discusses various targets and pathways that could be emerging pharmacological therapies for hypertension.
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Affiliation(s)
- Lokesh Kumar Bhatt
- Department of Pharmacology, SVKM's DR. Bhanuben Nanavati College of Pharmacy, Vile Parle (W), Mumbai, India.
| | - Ishant Selokar
- Department of Pharmacology, SVKM's DR. Bhanuben Nanavati College of Pharmacy, Vile Parle (W), Mumbai, India
| | - Dezaree Raut
- Department of Pharmacology, SVKM's DR. Bhanuben Nanavati College of Pharmacy, Vile Parle (W), Mumbai, India
| | - Tahir Hussain
- College of Pharmacy, University of Houston, Houston, TX, USA
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Li Y, Lu H, Xu W, Shang Y, Zhao C, Wang Y, Yang R, Jin S, Wu Y, Wang X, Teng X. Apelin ameliorated acute heart failure via inhibiting endoplasmic reticulum stress in rabbits. Amino Acids 2021; 53:417-427. [PMID: 33609179 DOI: 10.1007/s00726-021-02955-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 02/04/2021] [Indexed: 12/12/2022]
Abstract
This study aimed to investigate whether inhibition of endoplasmic reticulum stress (ERS) mediated the ameliorative effect of apelin on acute heart failure (AHF). Rabbit model of AHF was induced by sodium pentobarbital. Cardiac dysfunction and injury were detected in the rabbit models of AHF, including impaired hemodynamic parameters and increased levels of CK-MB and cTnI. Apelin treatment dramatically improved cardiac impairment caused by AHF. ERS, indexed by increased GRP78, CHOP, and cleaved-caspase12 protein levels, was simultaneously attenuated by apelin. Apelin also could ameliorate increased protein levels of cleaved-caspase3 and Bax, and improved decreased protein levels of Bcl-2. Two common ERS stimulators, tunicamycin (Tm) and dithiothreitol (DTT) blocked the ameliorative effect of apelin on AHF. Phosphorylated Akt levels increased after apelin treatment in the rabbit models of AHF. The Akt signaling inhibitors wortmannin and LY294002 could block the cardioprotective effect of apelin, which could be relieved by ERS inhibitor 4-phenyl butyric acid (4-PBA). The aforementioned beneficial effects of apelin could all be blocked by APJ receptor antagonist F13A. 4-PBA and SC79, an Akt activator, can restore the ameliorative effect of apelin on AHF blocked by F13A. Apelin treatment dramatically ameliorated cardiac impairment caused by AHF, which might be mediated by APJ/Akt/ERS signaling pathway. These results will shed new light on AHF therapy.
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Affiliation(s)
- Yanqing Li
- Hebei Provincial Hospital of Chinese Medicine, Hebei University of Chines Medicine, Shijiazhuang, 050011, China
| | - Haohan Lu
- Department of Physiology, Hebei Medical University, Zhongshan East Road No. 361, Shijiazhuang, 050017, China
| | - Wenyuan Xu
- Department of Physiology, Hebei Medical University, Zhongshan East Road No. 361, Shijiazhuang, 050017, China
| | - Yuxuan Shang
- Department of Physiology, Hebei Medical University, Zhongshan East Road No. 361, Shijiazhuang, 050017, China
| | - Cece Zhao
- Department of Physiology, Hebei Medical University, Zhongshan East Road No. 361, Shijiazhuang, 050017, China
| | - Yipu Wang
- Department of Physiology, Hebei Medical University, Zhongshan East Road No. 361, Shijiazhuang, 050017, China
| | - Rui Yang
- Department of Physiology, Hebei Medical University, Zhongshan East Road No. 361, Shijiazhuang, 050017, China
| | - Sheng Jin
- Department of Physiology, Hebei Medical University, Zhongshan East Road No. 361, Shijiazhuang, 050017, China
| | - Yuming Wu
- Department of Physiology, Hebei Medical University, Zhongshan East Road No. 361, Shijiazhuang, 050017, China
- Hebei Collaborative Innovation Center for Cardio-cerebrovascular Disease, Shijiazhuang, 050017, China
| | - Xiaoning Wang
- The Second Hospital, Hebei Medical University, Heping West Road No. 215, Shijiazhuang, 050000, China.
| | - Xu Teng
- Department of Physiology, Hebei Medical University, Zhongshan East Road No. 361, Shijiazhuang, 050017, China.
- Hebei Key Laboratory of Laboratory Animal Science, Shijiazhuang, 050017, China.
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Wojno O, Czarzasta K, Puchalska L, Kowalczyk M, Cudnoch-Jedrzejewska A. Central interaction between the apelinergic and vasopressinergic systems in the regulation of the haemodynamic parameters in rats maintained on a high-fat diet. Clin Exp Pharmacol Physiol 2020; 47:1902-1911. [PMID: 32687615 DOI: 10.1111/1440-1681.13381] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 07/09/2020] [Accepted: 07/10/2020] [Indexed: 11/29/2022]
Abstract
A high-fat diet can affect the central activity of the apelinergic and vasopressinergic systems, which can have a significant impact on cardiovascular regulation. The aim of the study was to investigate the role of the central interaction between apelin and vasopressin in the regulation of the cardiovascular system in Sprague Dawley rats maintained on a normal-fat diet (NFD) or on a high-fat diet (HFD). The animals were instrumented with a cannula implanted into the left cerebral ventricle for intracerebroventricular (ICV) infusions of saline (0.9% NaCl), apelin-13 (APLN-13), V1a receptor antagonist (V1aRANT) APJ receptor antagonist (F13A), vasopressin (AVP); and with a catheter placed within the femoral artery for mean arterial blood pressure and heart rate monitoring. Blood, the hypothalamus and the medulla oblongata were collected for biochemical analysis. The hypertensive effect of APLN-13 was blocked by a prior ICV infusion of V1aRANT, only in the NFD rats. However, the hypertensive effect of AVP was blocked by the prior ICV infusion of F13A in both the NFD and HFD rats. A HFD caused an increase in the protein level of APJ and V1a receptors, both in the hypothalamus and the medulla oblongata. This study confirms the presence of an interaction between both peptides in the central regulation of the cardiovascular system in rats on a NFD or a HFD.
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Affiliation(s)
- Olena Wojno
- Department of Experimental and Clinical Physiology, Laboratory of Centre for Preclinical Research, Medical University of Warsaw, Warsaw, Poland
| | - Katarzyna Czarzasta
- Department of Experimental and Clinical Physiology, Laboratory of Centre for Preclinical Research, Medical University of Warsaw, Warsaw, Poland
| | - Liana Puchalska
- Department of Experimental and Clinical Physiology, Laboratory of Centre for Preclinical Research, Medical University of Warsaw, Warsaw, Poland
| | - Malgorzata Kowalczyk
- Department of Experimental and Clinical Physiology, Laboratory of Centre for Preclinical Research, Medical University of Warsaw, Warsaw, Poland
| | - Agnieszka Cudnoch-Jedrzejewska
- Department of Experimental and Clinical Physiology, Laboratory of Centre for Preclinical Research, Medical University of Warsaw, Warsaw, Poland
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The Elabela in hypertension, cardiovascular disease, renal disease, and preeclampsia: an update. J Hypertens 2020; 39:12-22. [PMID: 32740407 DOI: 10.1097/hjh.0000000000002591] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
: Although considerable success has been shown for antihypertensive medications, the resistant hypertension and hypertension-related organ damages are still the important clinical issues and pose as high health and economic pressure. Therefore, novel therapeutic techniques and antihypertensive drugs are needed to advance more effective therapy of hypertension and hypertension-related disease to ameliorate mortality and healthcare costs worldwide. In this review, we highlight the latest progress in supporting the therapeutic potential of Elabela (ELA), a recently discovered early endogenous ligand for G-protein-coupled receptor apelin peptide jejunum, apelin receptor. Systemic administration of ELA exerts vasodilatory, antihypertensive, cardioprotective, and renoprotective effects, whereas central application of ELA increases blood pressure and causes cardiovascular remodeling primarily secondary to the hypertension. In addition, ELA drives extravillous trophoblast differentiation and prevents the pathogenesis of preeclampsia (a gestational hypertensive syndrome) by promoting placental angiogenesis. These findings strongly suggest peripheral ELA's therapeutic potential in preventing and treating hypertension and hypertension-related diseases including cardiovascular disease, kidney disease, and preeclampsia. Since therapeutic use of ELA is mainly limited by its short half-life and parenteral administration, it may be a clinical application candidate for the therapy of hypertension and its complications when fused with a large inert chemicals (e.g. polyethylene glycol, termed polyethylene glycol-ELA-21) or other proteins (e.g. the Fc fragment of IgG and albumin, termed Fc-ELA-21 or albumin-ELA-21), and new delivery methods are encouraged to develop to improve the efficacy of ELA fragments on apelin peptide jejunum or alternative unknown receptors.
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Griffiths PR, Lolait SJ, Bijabhai A, O’Carroll-Lolait A, Paton JFR, O’Carroll AM. Increased apelin receptor gene expression in the subfornical organ of spontaneously hypertensive rats. PLoS One 2020; 15:e0231844. [PMID: 32315363 PMCID: PMC7173921 DOI: 10.1371/journal.pone.0231844] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 04/01/2020] [Indexed: 02/06/2023] Open
Abstract
The vascular organ of the lamina terminalis, subfornical organ (SFO), and area postrema comprise the sensory circumventricular organs (CVO) which are central structures that lie outside the blood brain barrier and are thought to provide an interface between peripherally circulating signals and the brain through their projections to central autonomic structures. The SFO expresses mRNA for the G protein-coupled apelin receptor (APJ, gene name aplnr) and exogenous microinjection of the neuropeptide apelin (apln) to the SFO elicits a depressor effect. Here we investigated the expression and cellular distribution of aplnr, apln and the recently described ligand apela (apela) in the CVOs and investigated whether differences in the levels of expression of apelinergic gene transcripts in these regions might underlie the chronic elevated blood pressure seen in hypertension. We carried out multiplex in situ hybridization histochemistry on CVO tissue sections from spontaneously hypertensive rats (SHR) and normotensive Wistar Kyoto (WKY) controls. Confocal immunofluorescent images indicated strong aplnr expression, with lower levels of apln and modest apela expression, in the CVOs of both WKY rats and SHRs, in both neurons and glia. The expression level of aplnr transcripts was increased in the SFO of SHRs compared to WKY rats. Our data may highlight a potential dysfunction in the communication between CVOs and downstream signalling pathways in SHRs, which may contribute to its different phenotype/s.
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Affiliation(s)
- Philip R. Griffiths
- Bristol Medical School, Faculty of Health Sciences, University of Bristol, Bristol, United Kingdom
| | - Stephen J. Lolait
- Bristol Medical School, Faculty of Health Sciences, University of Bristol, Bristol, United Kingdom
| | - Aarifah Bijabhai
- Bristol Medical School, Faculty of Health Sciences, University of Bristol, Bristol, United Kingdom
| | - Aoife O’Carroll-Lolait
- School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - Julian F. R. Paton
- Department of Physiology, Faculty of Medical & Health Sciences, University of Auckland, Auckland, New Zealand
- School of Physiology, Pharmacology and Neuroscience, Biomedical Sciences, University of Bristol, Bristol, United Kingdom
| | - Anne-Marie O’Carroll
- Bristol Medical School, Faculty of Health Sciences, University of Bristol, Bristol, United Kingdom
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Czarzasta K, Wojno O, Zera T, Puchalska L, Dobruch J, Cudnoch-Jedrzejewska A. The influence of post-infarct heart failure and high fat diet on the expression of apelin APJ and vasopressin V1a and V1b receptors. Neuropeptides 2019; 78:101975. [PMID: 31645268 DOI: 10.1016/j.npep.2019.101975] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 10/04/2019] [Accepted: 10/07/2019] [Indexed: 12/12/2022]
Abstract
Vasopressin and apelin are reciprocally regulated hormones which are implicated in the pathophysiology of heart failure and the regulation of metabolism; however, little is known about their interactions under pathological conditions. In this study, we determined how post-infarct heart failure (HF) and a high fat diet (HFD) affect expression of the apelin APJ receptor (APJR) and the V1a (V1aR) and V1b (V1bR) vasopressin receptors in the hypothalamus, the heart, and the retroperitoneal adipose tissue. We performed experiments in male 4-week-old Sprague Dawley rats. The animals received either a normal fat diet (NFD) or a HFD for 8 weeks, then they underwent left coronary artery ligation to induce HF or sham surgery (SO), followed by 4 weeks of NFD or HFD. The HF rats showed higher plasma concentration of NT-proBNP and copeptin. The HF reduced the APJR mRNA expression in the hypothalamus. The APJR and V1aR protein levels in the hypothalamus were regulated both by HF and HFD, while the V1bR protein level in the hypothalamus was mainly influenced by HF. APJR mRNA expression in the heart was significantly higher in rats on HFD, and HFD affected the reduction of the APJR protein level in the right ventricle. The regulation of APJR, V1aR and V1bR expression in the heart and the retroperitoneal adipose tissue were affected by both HF and HFD. Our study demonstrates that HF and HFD cause significant changes in the expression of APJR, V1aR and V1bR, which may have an important influence on the cardiovascular system and metabolism.
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Affiliation(s)
- Katarzyna Czarzasta
- Department of Experimental and Clinical Physiology, Laboratory of Centre for Preclinical Research, Medical University of Warsaw, Warsaw, Poland
| | - Olena Wojno
- Department of Experimental and Clinical Physiology, Laboratory of Centre for Preclinical Research, Medical University of Warsaw, Warsaw, Poland
| | - Tymoteusz Zera
- Department of Experimental and Clinical Physiology, Laboratory of Centre for Preclinical Research, Medical University of Warsaw, Warsaw, Poland
| | - Liana Puchalska
- Department of Experimental and Clinical Physiology, Laboratory of Centre for Preclinical Research, Medical University of Warsaw, Warsaw, Poland
| | - Jakub Dobruch
- Department of Urology, Centre of Postgraduate Medical Education, Warsaw, Poland
| | - Agnieszka Cudnoch-Jedrzejewska
- Department of Experimental and Clinical Physiology, Laboratory of Centre for Preclinical Research, Medical University of Warsaw, Warsaw, Poland.
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12
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Zhao Y, Li Y, Li Z, Xu B, Chen P, Yang X. Superoxide anions modulate the performance of apelin in the paraventricular nucleus on sympathetic activity and blood pressure in spontaneously hypertensive rats. Peptides 2019; 121:170051. [PMID: 30582943 DOI: 10.1016/j.peptides.2018.12.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 12/17/2018] [Accepted: 12/18/2018] [Indexed: 01/24/2023]
Abstract
The present study was designed to determine how apelin in paraventricular nucleus (PVN) modulates the renal sympathetic nerve activity (RSNA), arterial blood pressure (ABP), mean arterial pressure (MAP), and heart rate (HR), and whether superoxide anions regulate the performance of PVN apelin in spontaneously hypertensive rats (SHRs). Acute experiment was carried out with 13-week-old male Wistar-Kyoto rats (WKY) and SHRs under anaesthesia. RSNA, ABP, MAP and HR after PVN microinjection were measured. Apelin microinjection into PVN increased RSNA, ABP, MAP and HR in WKY rats and SHRs, more obviously in SHRs. APJ antagonist F13A decreased the RSNA, ABP, MAP and HR in SHRs, and inhibited the effects of apelin. Apelin and APJ mRNA levels were higher in the PVN in SHRs. PVN microinjection of superoxide anion scavengers tempol and tiron, or NAD(P)H oxidase inhibitor apocynin, decreased the RSNA, ABP, MAP and HR in SHRs, and inhibited the effects of apelin, but the superoxide dismutase (SOD) inhibitor diethyldithiocarbamic acid (DETC) potentiated the effects of apelin. NAD(P)H oxidase activity and superoxide anion levels in PVN were increased by apelin, but decreased by APJ antagonist F13A. The apelin-induced increases in NAD(P)H oxidase activity and superoxide anion level were abolished by pre-treatment with F13A. These results indicate that apelin in PVN increases the sympathetic outflow and blood pressure via activating APJ receptor. The enhanced activity of endogenous apelin and APJ receptor in PVN contributes to sympathetic activation in hypertension, and the superoxide anion is involved in these apelin-mediated processes in PVN.
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Affiliation(s)
- Yuewu Zhao
- Department of Cardiology, The First Affiliated Hospital of Soochow University, Suzhou, China; Department of Cardiology, Xuzhou No. 1 People's Hospital, Xuzhou, China
| | - Yong Li
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Zhengzhang Li
- Department of Cardiology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Bing Xu
- Department of Cardiology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Peng Chen
- Department of Cardiology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Xiangjun Yang
- Department of Cardiology, The First Affiliated Hospital of Soochow University, Suzhou, China.
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13
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Luo H, Han L, Xu J. Apelin/APJ system: A novel promising target for neurodegenerative diseases. J Cell Physiol 2019; 235:638-657. [DOI: 10.1002/jcp.29001] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Accepted: 06/06/2019] [Indexed: 12/17/2022]
Affiliation(s)
- Huaiqing Luo
- Department of Physiology Changsha Medical University Changsha Hunan China
- Department of Physiology, School of Basic Medical Science Central South University Changsha Hunan China
| | - Li Han
- Department of Physiology Changsha Medical University Changsha Hunan China
| | - Jin Xu
- School of Pharmaceutical Sciences Changsha Medical University Changsha Hunan China
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14
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Griffiths PR, Lolait SJ, Pearce LE, McBryde FD, Paton JFR, O'Carroll AM. Blockade of Rostral Ventrolateral Medulla Apelin Receptors Does Not Attenuate Arterial Pressure in SHR and L-NAME-Induced Hypertensive Rats. Front Physiol 2018; 9:1488. [PMID: 30459635 PMCID: PMC6232890 DOI: 10.3389/fphys.2018.01488] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Accepted: 10/02/2018] [Indexed: 01/02/2023] Open
Abstract
Dysfunction of the apelinergic system, comprised of the neuropeptide apelin mediating its effects via the G protein-coupled apelin receptor (APJ), may underlie the onset of cardiovascular disease such as hypertension. Apelin expression is increased in the rostral ventrolateral medulla (RVLM) in spontaneously hypertensive rats (SHRs) compared to Wistar-Kyoto (WKY) normotensive rats, however, evidence that the apelinergic system chronically influences mean arterial blood pressure (MABP) under pathophysiological conditions remains to be established. In this study we investigated, in conscious unrestrained rats, whether APJ contributes to MABP and sympathetic vasomotor tone in the progression of two models of hypertension - SHR and L-NAME-treated rats - and whether APJ contributes to the development of hypertension in pre-hypertensive SHR. In SHR we showed that APJ gene (aplnr) expression was elevated in the RVLM, and there was a greater MABP increase following microinjection of [Pyr1]apelin-13 to the RVLM of SHR compared to WKY rats. Bilateral microinjection of a lentiviral APJ-specific-shRNA construct into the RVLM of WKY, SHR, and L-NAME-treated rats, chronically implanted with radiotelemeters to measure MABP, decreased aplnr expression in the RVLM and abolished acute [Pyr1]apelin-13-induced increases in MABP. However, chronic knockdown of aplnr in the RVLM did not affect MABP in either SHR or L-NAME-treated rats. Moreover, knockdown of aplnr in the RVLM of prehypertensive SHR did not protect against the development of hypertension. These results show that endogenous apelin, acting via APJ, is not involved in the genesis or maintenance of hypertension in either animal model used in this study.
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Affiliation(s)
- Philip R Griffiths
- Laboratories for Integrative Neuroscience and Endocrinology, Bristol Medical School, University of Bristol, Bristol, United Kingdom
| | - Stephen J Lolait
- Laboratories for Integrative Neuroscience and Endocrinology, Bristol Medical School, University of Bristol, Bristol, United Kingdom
| | - Louise E Pearce
- Laboratories for Integrative Neuroscience and Endocrinology, Bristol Medical School, University of Bristol, Bristol, United Kingdom
| | - Fiona D McBryde
- Department of Physiology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| | - Julian F R Paton
- Department of Physiology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand.,School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, United Kingdom
| | - Anne-Marie O'Carroll
- Laboratories for Integrative Neuroscience and Endocrinology, Bristol Medical School, University of Bristol, Bristol, United Kingdom
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15
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Roy RK, Augustine RA, Brown CH, Schwenke DO. Activation of oxytocin neurons in the paraventricular nucleus drives cardiac sympathetic nerve activation following myocardial infarction in rats. Commun Biol 2018; 1:160. [PMID: 30320228 PMCID: PMC6172223 DOI: 10.1038/s42003-018-0169-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 09/10/2018] [Indexed: 01/16/2023] Open
Abstract
Myocardial infarction (MI) initiates an increase in cardiac sympathetic nerve activity (SNA) that facilitates potentially fatal arrhythmias. The mechanism(s) underpinning sympathetic activation remain unclear. Some neuronal populations within the hypothalamic paraventricular nucleus (PVN) have been implicated in SNA. This study elucidated the role of the PVN in triggering cardiac SNA following MI (left anterior descending coronary artery ligation). By means of c-Fos, oxytocin, and vasopressin immunohistochemistry accompanied by retrograde tracing we showed that MI activates parvocellular oxytocin neurons projecting to the rostral ventral lateral medulla. Central inhibition of oxytocin receptors using atosiban (4.5 µg in 5 µl, i.c.v.), or retosiban (3 mg/kg, i.v.), prevented the MI-induced increase in SNA and reduced the incidence of ventricular arrhythmias and mortality. In conclusion, pre-autonomic oxytocin neurons can drive the increase in cardiac SNA following MI and peripheral administration of an oxytocin receptor blocker could be a plausible therapeutic strategy to improve outcomes for MI patients. Roy et al. showed that activation of parvocellular pre-autonomic oxytocin neurons increased sympathetic nerve activity following myocardial infarction. This and other aberrant physiological changes induced by acute myocardial infarction were decreased by oxytocin receptor antagonists, hinting to their potential therapeutic role.
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Affiliation(s)
- Ranjan K Roy
- Department of Physiology-HeartOtago, University of Otago, Dunedin, 9054, New Zealand
| | - Rachael A Augustine
- Department of Physiology-HeartOtago, University of Otago, Dunedin, 9054, New Zealand.,Brain Health Research Centre, University of Otago, Dunedin, 9054, New Zealand.,Centre for Neuroendocrinology, University of Otago, Dunedin, 9054, New Zealand
| | - Colin H Brown
- Department of Physiology-HeartOtago, University of Otago, Dunedin, 9054, New Zealand.,Brain Health Research Centre, University of Otago, Dunedin, 9054, New Zealand.,Centre for Neuroendocrinology, University of Otago, Dunedin, 9054, New Zealand
| | - Daryl O Schwenke
- Department of Physiology-HeartOtago, University of Otago, Dunedin, 9054, New Zealand.
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16
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Abstract
Apelin is a vasoactive peptide and is an endogenous ligand for APJ receptors, which are widely expressed in blood vessels, heart, and cardiovascular regulatory regions of the brain. A growing body of evidence now demonstrates a regulatory role for the apelin/APJ receptor system in cardiovascular physiology and pathophysiology, thus making it a potential target for cardiovascular drug discovery and development. Indeed, ongoing studies are investigating the potential benefits of apelin and apelin-mimetics for disorders such as heart failure and pulmonary arterial hypertension. Apelin causes relaxation of isolated arteries, and systemic administration of apelin typically results in a reduction in systolic and diastolic blood pressure and an increase in blood flow. Nonetheless, vasopressor responses and contraction of vascular smooth muscle in response to apelin have also been observed under certain conditions. The goal of the current review is to summarize major findings regarding the apelin/APJ receptor system in blood vessels, with an emphasis on regulation of vascular tone, and to identify areas of investigation that may provide guidance for the development of novel therapeutic agents that target this system.
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Affiliation(s)
- Amreen Mughal
- Department of Pharmaceutical Sciences, North Dakota State University Fargo, ND, USA
| | - Stephen T O'Rourke
- Department of Pharmaceutical Sciences, North Dakota State University Fargo, ND, USA.
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17
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Lozić M, Šarenac O, Murphy D, Japundžić-Žigon N. Vasopressin, Central Autonomic Control and Blood Pressure Regulation. Curr Hypertens Rep 2018; 20:11. [DOI: 10.1007/s11906-018-0811-0] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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18
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Abstract
Apelin and apela (ELABELA/ELA/Toddler) are two peptide ligands for a class A G-protein-coupled receptor named the apelin receptor (AR/APJ/APLNR). Ligand-AR interactions have been implicated in regulation of the adipoinsular axis, cardiovascular system, and central nervous system alongside pathological processes. Each ligand may be processed into a variety of bioactive isoforms endogenously, with apelin ranging from 13 to 55 amino acids and apela from 11 to 32, typically being cleaved C-terminal to dibasic proprotein convertase cleavage sites. The C-terminal region of the respective precursor protein is retained and is responsible for receptor binding and subsequent activation. Interestingly, both apelin and apela exhibit isoform-dependent variability in potency and efficacy under various physiological and pathological conditions, but most studies focus on a single isoform. Biophysical behavior and structural properties of apelin and apela isoforms show strong correlations with functional studies, with key motifs now well determined for apelin. Unlike its ligands, the AR has been relatively difficult to characterize by biophysical techniques, with most characterization to date being focused on effects of mutagenesis. This situation may improve following a recently reported AR crystal structure, but there are still barriers to overcome in terms of comprehensive biophysical study. In this review, we summarize the three components of the apelinergic system in terms of structure-function correlation, with a particular focus on isoform-dependent properties, underlining the potential for regulation of the system through multiple endogenous ligands and isoforms, isoform-dependent pharmacological properties, and biological membrane-mediated receptor interaction. © 2018 American Physiological Society. Compr Physiol 8:407-450, 2018.
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Affiliation(s)
- Kyungsoo Shin
- Department of Biochemistry & Molecular Biology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Calem Kenward
- Department of Biochemistry & Molecular Biology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Jan K Rainey
- Department of Biochemistry & Molecular Biology, Dalhousie University, Halifax, Nova Scotia, Canada
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada
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