1
|
Zhang Z, Xue P, Bendlin BB, Zetterberg H, De Felice F, Tan X, Benedict C. Melatonin: A potential nighttime guardian against Alzheimer's. Mol Psychiatry 2024:10.1038/s41380-024-02691-6. [PMID: 39128995 DOI: 10.1038/s41380-024-02691-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 07/31/2024] [Accepted: 08/01/2024] [Indexed: 08/13/2024]
Abstract
In the context of the escalating global health challenge posed by Alzheimer's disease (AD), this comprehensive review considers the potential of melatonin in both preventive and therapeutic capacities. As a naturally occurring hormone and robust antioxidant, accumulating evidence suggests melatonin is a compelling candidate to consider in the context of AD-related pathologies. The review considers several mechanisms, including potential effects on amyloid-beta and pathologic tau burden, antioxidant defense, immune modulation, and regulation of circadian rhythms. Despite its promise, several gaps need to be addressed prior to clinical translation. These include conducting additional randomized clinical trials in patients with or at risk for AD dementia, determining optimal dosage and timing, and further determining potential side effects, particularly of long-term use. This review consolidates existing knowledge, identifies gaps, and suggests directions for future research to better understand the potential of melatonin for neuroprotection and disease mitigation within the landscape of AD.
Collapse
Affiliation(s)
- Zefan Zhang
- Department of Big Data in Health Science, Zhejiang University School of Public Health and Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- The Key Laboratory of Intelligent Preventive Medicine of Zhejiang Province, Hangzhou, China
| | - Pei Xue
- Department of Pharmaceutical Biosciences, Uppsala University, Uppsala, Sweden
| | - Barbara B Bendlin
- School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA
- Wisconsin Alzheimer's Disease Research Center, Madison, WI, USA
- Wisconsin Alzheimer's Institute, Madison, WI, USA
| | - Henrik Zetterberg
- Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, the Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden
- Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden
- Department of Neurodegenerative Disease, UCL Institute of Neurology, Queen Square, London, UK
- UK Dementia Research Institute at UCL, London, UK
- Hong Kong Center for Neurodegenerative Diseases, Clear Water Bay, Hong Kong, China
- Wisconsin Alzheimer's Disease Research Center, School of Medicine and Public Health, University of Wisconsin, University of Wisconsin-Madison, Madison, WI, USA
| | - Fernanda De Felice
- Centre for Neurosciences Studies, Departments of Biomedical and Molecular Sciences, and Psychiatry, Queen's University, Kingston, ON, K7L 3N6, Canada
- D'Or Institute for Research and Education, Rio de Janeiro RJ, 22281-100, Brazil
- Institute of Medical Biochemistry Leopoldo de Meis, Federal University of Rio de Janeiro, 21941-902, Rio de Janeiro RJ, Brazil
| | - Xiao Tan
- Department of Big Data in Health Science, Zhejiang University School of Public Health and Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.
- The Key Laboratory of Intelligent Preventive Medicine of Zhejiang Province, Hangzhou, China.
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.
| | - Christian Benedict
- Department of Pharmaceutical Biosciences, Uppsala University, Uppsala, Sweden.
| |
Collapse
|
2
|
Feng Y, Jiang X, Liu W, Lu H. The location, physiology, pathology of hippocampus Melatonin MT 2 receptor and MT 2-selective modulators. Eur J Med Chem 2023; 262:115888. [PMID: 37866336 DOI: 10.1016/j.ejmech.2023.115888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 10/06/2023] [Accepted: 10/17/2023] [Indexed: 10/24/2023]
Abstract
Melatonin, a neurohormone secreted by the pineal gland and regulated by the suprachiasmatic nucleus (SCN) of the hypothalamus, is synthesized and directly released into the cerebrospinal fluid (CSF) of the third ventricle (3rdv), where it undergoes rapid absorption by surrounding tissues to exert its physiological function. The hippocampus, a vital structure in the limbic system adjacent to the ventricles, plays a pivotal role in emotional response and memory formation. Melatonin MT1 and MT2 receptors are G protein-coupled receptors (GPCRs) that primarily mediate melatonin's receptor-dependent effects. In comparison to the MT1 receptor, the widely expressed MT2 receptor is crucial for mediating melatonin's biological functions within the hippocampus. Specifically, MT2 receptor is implicated in hippocampal synaptic plasticity and memory processes, as well as neurogenesis and axogenesis. Numerous studies have demonstrated the involvement of MT2 receptors in the pathophysiology and pharmacology of Alzheimer's disease, depression, and epilepsy. This review focuses on the anatomical localization of MT2 receptor in the hippocampus, their physiological function in this region, and their signal transduction and pharmacological roles in neurological disorders. Additionally, we conducted a comprehensive review of MT2 receptor ligands used in psychopharmacology and other MT2-selective ligands over recent years. Ultimately, we provide an outlook on future research for selective MT2 receptor drug candidates.
Collapse
Affiliation(s)
- Yueqin Feng
- Department of Ultrasound, the First Affiliated Hospital of China Medical University, Shenyang, PR China
| | - Xiaowen Jiang
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, PR China
| | - Wenwu Liu
- School of Pharmaceutical Sciences, Tsinghua University, Beijing, PR China
| | - Hongyuan Lu
- Department of Clinical Pharmacology, China Medical University, Shenyang, PR China.
| |
Collapse
|
3
|
Carretero VJ, Ramos E, Segura-Chama P, Hernández A, Baraibar AM, Álvarez-Merz I, Muñoz FL, Egea J, Solís JM, Romero A, Hernández-Guijo JM. Non-Excitatory Amino Acids, Melatonin, and Free Radicals: Examining the Role in Stroke and Aging. Antioxidants (Basel) 2023; 12:1844. [PMID: 37891922 PMCID: PMC10603966 DOI: 10.3390/antiox12101844] [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: 09/05/2023] [Revised: 09/23/2023] [Accepted: 09/26/2023] [Indexed: 10/29/2023] Open
Abstract
The aim of this review is to explore the relationship between melatonin, free radicals, and non-excitatory amino acids, and their role in stroke and aging. Melatonin has garnered significant attention in recent years due to its diverse physiological functions and potential therapeutic benefits by reducing oxidative stress, inflammation, and apoptosis. Melatonin has been found to mitigate ischemic brain damage caused by stroke. By scavenging free radicals and reducing oxidative damage, melatonin may help slow down the aging process and protect against age-related cognitive decline. Additionally, non-excitatory amino acids have been shown to possess neuroprotective properties, including antioxidant and anti-inflammatory in stroke and aging-related conditions. They can attenuate oxidative stress, modulate calcium homeostasis, and inhibit apoptosis, thereby safeguarding neurons against damage induced by stroke and aging processes. The intracellular accumulation of certain non-excitatory amino acids could promote harmful effects during hypoxia-ischemia episodes and thus, the blockade of the amino acid transporters involved in the process could be an alternative therapeutic strategy to reduce ischemic damage. On the other hand, the accumulation of free radicals, specifically mitochondrial reactive oxygen and nitrogen species, accelerates cellular senescence and contributes to age-related decline. Recent research suggests a complex interplay between melatonin, free radicals, and non-excitatory amino acids in stroke and aging. The neuroprotective actions of melatonin and non-excitatory amino acids converge on multiple pathways, including the regulation of calcium homeostasis, modulation of apoptosis, and reduction of inflammation. These mechanisms collectively contribute to the preservation of neuronal integrity and functions, making them promising targets for therapeutic interventions in stroke and age-related disorders.
Collapse
Affiliation(s)
- Victoria Jiménez Carretero
- Department of Pharmacology and Therapeutic, Teófilo Hernando Institute, Faculty of Medicine, Universidad Autónoma de Madrid, Av. Arzobispo Morcillo 4, 28029 Madrid, Spain
| | - Eva Ramos
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Complutense University of Madrid, 28040 Madrid, Spain
| | - Pedro Segura-Chama
- Investigador por México-CONAHCYT, Instituto Nacional de Psiquiatría "Ramón de la Fuente Muñiz", Calzada México-Xochimilco 101, Huipulco, Tlalpan, Mexico City 14370, Mexico
| | - Adan Hernández
- Institute of Neurobiology, Universidad Nacional Autónoma of México, Juriquilla, Santiago de Querétaro 76230, Querétaro, Mexico
| | - Andrés M Baraibar
- Department of Neurosciences, Universidad del País Vasco UPV/EHU, Achucarro Basque Center for Neuroscience, Barrio Sarriena, s/n, 48940 Leioa, Spain
| | - Iris Álvarez-Merz
- Department of Pharmacology and Therapeutic, Teófilo Hernando Institute, Faculty of Medicine, Universidad Autónoma de Madrid, Av. Arzobispo Morcillo 4, 28029 Madrid, Spain
| | - Francisco López Muñoz
- Faculty of Health Sciences, University Camilo José Cela, C/Castillo de Alarcón 49, Villanueva de la Cañada, 28692 Madrid, Spain
- Neuropsychopharmacology Unit, Hospital 12 de Octubre Research Institute (i + 12), Avda. Córdoba, s/n, 28041 Madrid, Spain
| | - Javier Egea
- Molecular Neuroinflammation and Neuronal Plasticity Research Laboratory, Hospital Universitario Santa Cristina, Health Research Institute, Hospital Universitario de la Princesa, 28006 Madrid, Spain
| | - José M Solís
- Neurobiology-Research Service, Hospital Ramón y Cajal, Carretera de Colmenar Viejo, Km. 9, 28029 Madrid, Spain
| | - Alejandro Romero
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Complutense University of Madrid, 28040 Madrid, Spain
| | - Jesús M Hernández-Guijo
- Department of Pharmacology and Therapeutic, Teófilo Hernando Institute, Faculty of Medicine, Universidad Autónoma de Madrid, Av. Arzobispo Morcillo 4, 28029 Madrid, Spain
- Ramón y Cajal Institute for Health Research (IRYCIS), Hospital Ramón y Cajal, Carretera de Colmenar Viejo, Km. 9, 28029 Madrid, Spain
| |
Collapse
|
4
|
Melatonin in ventricular and subarachnoid cerebrospinal fluid: Its function in the neural glymphatic network and biological significance for neurocognitive health. Biochem Biophys Res Commun 2022; 605:70-81. [DOI: 10.1016/j.bbrc.2022.03.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 03/02/2022] [Accepted: 03/04/2022] [Indexed: 12/13/2022]
|
5
|
Feletti A, Fiorindi A, Lavecchia V, Boscolo-Berto R, Marton E, Macchi V, De Caro R, Longatti P, Porzionato A, Pavesi G. A light on the dark side: in vivo endoscopic anatomy of the posterior third ventricle and its variations in hydrocephalus. J Neurosurg 2021; 135:309-317. [PMID: 32619975 DOI: 10.3171/2020.4.jns20493] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Accepted: 04/15/2020] [Indexed: 01/18/2023]
Abstract
OBJECTIVE Despite the technological advancements of neurosurgery, the posterior part of the third ventricle has always been the "dark side" of the ventricle. However, flexible endoscopy offers the opportunity for a direct, in vivo inspection and detailed description of the posterior third ventricle in physiological and pathological conditions. The purposes of this study were to describe the posterior wall of the third ventricle, detailing its normal anatomy and surgical landmarks, and to assess the effect of chronic hydrocephalus on the anatomy of this hidden region. METHODS The authors reviewed the video recordings of 59 in vivo endoscopic explorations of the posterior third ventricle to describe every identifiable anatomical landmark. Patients were divided into 2 groups based on the absence or presence of a chronic dilation of the third ventricle. The first group provided the basis for the description of normal anatomy. RESULTS The following anatomical structures were identified in all cases: adytum of the cerebral aqueduct, posterior commissure, pineal recess, habenular commissure, and suprapineal recess. Comparing the 2 groups of patients, the authors were able to detect significant variations in the shape of the adytum of the cerebral aqueduct and in the thickness of the habenular and posterior commissures. Exploration with sodium fluorescein excluded the presence of any fluorescent area in the posterior third ventricle, other than the subependymal vascular network. CONCLUSIONS The use of a flexible scope allows the complete inspection of the posterior third ventricle. The anatomical variations caused by chronic hydrocephalus might be clinically relevant, in light of the commissure functions.
Collapse
Affiliation(s)
- Alberto Feletti
- 1Department of Neurosciences, Biomedicine, and Movement Sciences, Institute of Neurosurgery, University of Verona
- 2Department of Neurosciences, Neurosurgical Unit, University of Modena
| | - Alessandro Fiorindi
- 3Neurosurgical Department, Spedali Civili, University of Brescia
- 4Neurosurgical Department, Treviso Regional Hospital, University of Padova, Treviso; and
| | | | - Rafael Boscolo-Berto
- 5Department of Neuroscience, Institute of Human Anatomy, University of Padova, Italy
| | - Elisabetta Marton
- 4Neurosurgical Department, Treviso Regional Hospital, University of Padova, Treviso; and
| | - Veronica Macchi
- 5Department of Neuroscience, Institute of Human Anatomy, University of Padova, Italy
| | - Raffaele De Caro
- 5Department of Neuroscience, Institute of Human Anatomy, University of Padova, Italy
| | - Pierluigi Longatti
- 4Neurosurgical Department, Treviso Regional Hospital, University of Padova, Treviso; and
| | - Andrea Porzionato
- 5Department of Neuroscience, Institute of Human Anatomy, University of Padova, Italy
| | - Giacomo Pavesi
- 2Department of Neurosciences, Neurosurgical Unit, University of Modena
| |
Collapse
|
6
|
Manchia M, Squassina A, Pisanu C, Congiu D, Garzilli M, Guiso B, Suprani F, Paribello P, Pulcinelli V, Iaselli MN, Pinna F, Valtorta F, Carpiniello B, Comai S. Investigating the relationship between melatonin levels, melatonin system, microbiota composition and bipolar disorder psychopathology across the different phases of the disease. Int J Bipolar Disord 2019; 7:27. [PMID: 31814040 PMCID: PMC6900376 DOI: 10.1186/s40345-019-0163-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Accepted: 10/24/2019] [Indexed: 01/27/2023] Open
Abstract
Background Bipolar disorder (BD) is characterized by recurrent episodes of depression and mania/hypomania alternating with intervals of well-being. The neurobiological underpinnings of BD are still veiled although there is evidence pointing to a malfunction of the circadian clock system that is regulated by the neuromodulator melatonin (MLT). Small sample size studies in BD patients have shown that changes in the levels of MLT are associated with shifts in illness status. Moreover, mood stabilizers (including lithium and valproic acid) influence the MLT system. Of interest, MLT also modulates intestinal microbiota, and recent work suggests an important role of microbiota alterations in neuropsychiatric disorders, including BD. This study is designed to explore whether the possible patterns of associations between changes in the levels of MLT and its precursors and BD mood phases are modulated by variants within the genes encoding for the elements of the MLT system and/or by the microbiota composition. Methods We will conduct a 2-year follow-up study in 50 BD patients during the three different mood phases of the disease. For each phase, we will perform a blood withdrawal for the analysis of MLT levels and of variants of the genes related to the MLT pathway between 8 and 10 a.m. after an overnight fasting, a stool specimen collection for the analysis of microbiota composition, and a detailed psychometric assessment for depression, mania, impulsivity and cognitive abilities. We will also recruit 50 healthy age-matched controls in whom we will perform a blood withdrawal between 8 and 10 a.m. after an overnight fasting, a stool specimen collection, and a psychometric assessment to exclude the presence of psychiatric disorders. Discussion In this cross sectional (case–control vs. BD comparisons) and longitudinal (24 months) study, we expect to clarify the link between the MLT system, microbiota and BD psychopathology. We expect to identify some typical BD symptomatic clusters that will be more strictly associated with variations in the MLT system. In a personalized medicine perspective, this subgroup of BD patients may benefit from a pharmacological therapy targeting the MLT system. Trial registration This study protocol was approved by the Ethics Committee of the University Hospital Agency of Cagliari (PG/2019/6277)
Collapse
Affiliation(s)
- Mirko Manchia
- Section of Psychiatry, Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy.,Unit of Clinical Psychiatry, University Hospital Agency of Cagliari, Cagliari, Italy.,Department of Pharmacology, Dalhousie University, Halifax, NS, Canada
| | - Alessio Squassina
- Department of Biomedical Science, Section of Neuroscience and Clinical Pharmacology, University of Cagliari, Cagliari, Italy
| | - Claudia Pisanu
- Department of Biomedical Science, Section of Neuroscience and Clinical Pharmacology, University of Cagliari, Cagliari, Italy
| | - Donatella Congiu
- Department of Biomedical Science, Section of Neuroscience and Clinical Pharmacology, University of Cagliari, Cagliari, Italy
| | - Mario Garzilli
- Section of Psychiatry, Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy.,Unit of Clinical Psychiatry, University Hospital Agency of Cagliari, Cagliari, Italy
| | - Beatrice Guiso
- Section of Psychiatry, Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy.,Unit of Clinical Psychiatry, University Hospital Agency of Cagliari, Cagliari, Italy
| | - Federico Suprani
- Section of Psychiatry, Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy.,Unit of Clinical Psychiatry, University Hospital Agency of Cagliari, Cagliari, Italy
| | - Pasquale Paribello
- Section of Psychiatry, Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy.,Unit of Clinical Psychiatry, University Hospital Agency of Cagliari, Cagliari, Italy
| | - Vittoria Pulcinelli
- Section of Psychiatry, Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy.,Unit of Clinical Psychiatry, University Hospital Agency of Cagliari, Cagliari, Italy
| | - Maria Novella Iaselli
- Section of Psychiatry, Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy.,Unit of Clinical Psychiatry, University Hospital Agency of Cagliari, Cagliari, Italy
| | - Federica Pinna
- Section of Psychiatry, Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy.,Unit of Clinical Psychiatry, University Hospital Agency of Cagliari, Cagliari, Italy
| | - Flavia Valtorta
- San Raffaele Scientific Institute and Vita Salute University, Via Olgettina 58, 20132, Milan, Italy
| | - Bernardo Carpiniello
- Section of Psychiatry, Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy.,Unit of Clinical Psychiatry, University Hospital Agency of Cagliari, Cagliari, Italy
| | - Stefano Comai
- San Raffaele Scientific Institute and Vita Salute University, Via Olgettina 58, 20132, Milan, Italy. .,Department of Psychiatry, McGill University, Montreal, QC, Canada.
| |
Collapse
|
7
|
Melatonin MT1 receptor as a novel target in neuropsychopharmacology: MT1 ligands, pathophysiological and therapeutic implications, and perspectives. Pharmacol Res 2019; 144:343-356. [DOI: 10.1016/j.phrs.2019.04.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Revised: 03/06/2019] [Accepted: 04/11/2019] [Indexed: 12/15/2022]
|
8
|
Thomovsky SA, Chen AV, Deavila DM, Kiszonas AM. Serum Melatonin Values in Normal Dogs and Dogs with Seizures. J Am Anim Hosp Assoc 2019; 55:78-82. [DOI: 10.5326/jaaha-ms-6669] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
ABSTRACT
Epilepsy, or recurrent seizures, is reported to be the most common neurologic condition in dogs; 20–30% of epileptic dogs are considered to be pharmacoresistent to one medication. The hormone melatonin has been shown to have significant anticonvulsant effects; epileptic humans have lower serum melatonin levels than unaffected individuals. We hypothesize that serum levels of melatonin will be lower in dogs with seizures as compared with normal dogs. Sixty-two dogs were enrolled in the study: 29 normal dogs (Group 1) and 33 dogs with seizures (Group 2). Blood sampling was done at three separate time points (8:00 a.m., 12:00, and 4:00 p.m.). The majority of dogs in Groups 1 (69%) and 2 (76%) had serum melatonin levels <0.5 pg/mL as measured by radioimmunoassay. There were no significant differences in serum melatonin values between the groups or within groups when time of blood draw, length of sample freezing, time of day/year of sampling, or presence of anticonvulsant therapy were compared. There were no notable differences in daytime serum melatonin values in normal dogs versus dogs with seizures. The majority of daytime serum melatonin levels were <0.5 pg/mL in dogs with and without seizures.
Collapse
Affiliation(s)
- Stephanie Ann Thomovsky
- From the College of Veterinary Medicine, Purdue University, Lafayette, Indiana (S.A.T.); and College of Veterinary Medicine (A.V.C.), Center for Reproductive Biology (D.M.D.), and USDA Agricultural Research Service (A.M.K.), Washington State University, Pullman, Washington
| | - Annie Vivian Chen
- From the College of Veterinary Medicine, Purdue University, Lafayette, Indiana (S.A.T.); and College of Veterinary Medicine (A.V.C.), Center for Reproductive Biology (D.M.D.), and USDA Agricultural Research Service (A.M.K.), Washington State University, Pullman, Washington
| | - David M. Deavila
- From the College of Veterinary Medicine, Purdue University, Lafayette, Indiana (S.A.T.); and College of Veterinary Medicine (A.V.C.), Center for Reproductive Biology (D.M.D.), and USDA Agricultural Research Service (A.M.K.), Washington State University, Pullman, Washington
| | - Alecia M. Kiszonas
- From the College of Veterinary Medicine, Purdue University, Lafayette, Indiana (S.A.T.); and College of Veterinary Medicine (A.V.C.), Center for Reproductive Biology (D.M.D.), and USDA Agricultural Research Service (A.M.K.), Washington State University, Pullman, Washington
| |
Collapse
|
9
|
Cipolla-Neto J, Amaral FGD. Melatonin as a Hormone: New Physiological and Clinical Insights. Endocr Rev 2018; 39:990-1028. [PMID: 30215696 DOI: 10.1210/er.2018-00084] [Citation(s) in RCA: 318] [Impact Index Per Article: 53.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 06/21/2018] [Indexed: 02/07/2023]
Abstract
Melatonin is a ubiquitous molecule present in almost every live being from bacteria to humans. In vertebrates, besides being produced in peripheral tissues and acting as an autocrine and paracrine signal, melatonin is centrally synthetized by a neuroendocrine organ, the pineal gland. Independently of the considered species, pineal hormone melatonin is always produced during the night and its production and secretory episode duration are directly dependent on the length of the night. As its production is tightly linked to the light/dark cycle, melatonin main hormonal systemic integrative action is to coordinate behavioral and physiological adaptations to the environmental geophysical day and season. The circadian signal is dependent on its daily production regularity, on the contrast between day and night concentrations, and on specially developed ways of action. During its daily secretory episode, melatonin coordinates the night adaptive physiology through immediate effects and primes the day adaptive responses through prospective effects that will only appear at daytime, when melatonin is absent. Similarly, the annual history of the daily melatonin secretory episode duration primes the central nervous/endocrine system to the seasons to come. Remarkably, maternal melatonin programs the fetuses' behavior and physiology to cope with the environmental light/dark cycle and season after birth. These unique ways of action turn melatonin into a biological time-domain-acting molecule. The present review focuses on the above considerations, proposes a putative classification of clinical melatonin dysfunctions, and discusses general guidelines to the therapeutic use of melatonin.
Collapse
Affiliation(s)
- José Cipolla-Neto
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | | |
Collapse
|
10
|
Alghamdi BS. The neuroprotective role of melatonin in neurological disorders. J Neurosci Res 2018; 96:1136-1149. [PMID: 29498103 PMCID: PMC6001545 DOI: 10.1002/jnr.24220] [Citation(s) in RCA: 127] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 12/08/2017] [Accepted: 01/08/2018] [Indexed: 12/16/2022]
Abstract
Melatonin is a neurohormone secreted from the pineal gland and has a wide-ranging regulatory and neuroprotective role. It has been reported that melatonin level is disturbed in some neurological conditions such as stroke, Alzheimer's disease, and Parkinson's disease, which indicates its involvement in the pathophysiology of these diseases. Its properties qualify it to be a promising potential therapeutic neuroprotective agent, with no side effects, for some neurological disorders. This review discusses and localizes the effect of melatonin in the pathophysiology of some diseases.
Collapse
Affiliation(s)
- B. S. Alghamdi
- Department of Physiology, Faculty of MedicineKing Abdulaziz UniversityJeddahKSA
- Neuroscience Unit, Faculty of MedicineKing Abdulaziz UniversityJeddahKSA
| |
Collapse
|
11
|
González A, González-González A, Alonso-González C, Menéndez-Menéndez J, Martínez-Campa C, Cos S. Melatonin inhibits angiogenesis in SH-SY5Y human neuroblastoma cells by downregulation of VEGF. Oncol Rep 2017; 37:2433-2440. [PMID: 28259965 DOI: 10.3892/or.2017.5446] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 10/10/2016] [Indexed: 02/07/2023] Open
Abstract
Vascular endothelial growth factor (VEGF) produced from tumor cells plays a crucial role in the pathogenesis and neovascularization of neuroblastoma. Inhibition of VEGF secretion by tumor cells, as well as VEGF-regulated signaling in endothelial cells, are important to reduce the angiogenesis and growth of neuroblastoma. Since melatonin has anti-angiogenic effects in tumor cell lines, the aim of the present study was to study melatonin modulation of the pro-angiogenic effects of VEGF in neuroblastoma cells (SH-SY5Y). We used co-cultures of SH-SY5Y and endothelial cells. VEGF expression and protein levels were analyzed by quantitative RT-PCR and ELISA, respectively. Endothelial cell migration was assessed by wound-healing assay and endothelial angiogenesis by a tube formation assay. Melatonin inhibited the pro-angiogenic effects of SH-SY5Y cells. The conditioned medium collected from the neuroblastoma cells was angiogenically active and stimulated proliferation, migration and tube formation in endothelial cells. This effect was significantly counteracted by the addition of either anti-VEGF or melatonin. Melatonin inhibited VEGF expression and secretion in SH-SY5Y cells, decreasing the levels of VEGF available for endothelial cells. Melatonin has anti-angiogenic effects at different steps of the angiogenic process in SH-SY5Y neuroblastoma cells, through the downregulation of VEGF.
Collapse
Affiliation(s)
- Alicia González
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria and Valdecilla Research Institute (IDIVAL), ES-39011 Santander, Spain
| | - Alicia González-González
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria and Valdecilla Research Institute (IDIVAL), ES-39011 Santander, Spain
| | - Carolina Alonso-González
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria and Valdecilla Research Institute (IDIVAL), ES-39011 Santander, Spain
| | - Javier Menéndez-Menéndez
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria and Valdecilla Research Institute (IDIVAL), ES-39011 Santander, Spain
| | - Carlos Martínez-Campa
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria and Valdecilla Research Institute (IDIVAL), ES-39011 Santander, Spain
| | - Samuel Cos
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria and Valdecilla Research Institute (IDIVAL), ES-39011 Santander, Spain
| |
Collapse
|
12
|
Landagaray E, Ettaoussi M, Rami M, Boutin JA, Caignard DH, Delagrange P, Melnyk P, Berthelot P, Yous S. New quinolinic derivatives as melatonergic ligands: Synthesis and pharmacological evaluation. Eur J Med Chem 2017; 127:621-631. [DOI: 10.1016/j.ejmech.2016.12.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Revised: 12/04/2016] [Accepted: 12/05/2016] [Indexed: 01/03/2023]
|
13
|
Tsutsumi S, Ono H, Yasumoto Y. The suprapineal recess of the third ventricle: an anatomic study with magnetic resonance imaging. Surg Radiol Anat 2016; 39:725-730. [PMID: 27942944 DOI: 10.1007/s00276-016-1794-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 12/04/2016] [Indexed: 02/06/2023]
Abstract
PURPOSE The suprapineal recess (SPR) is a small, backward extension of the third ventricle. Few radiological studies have investigated the morphology of the SPR. Here, we explore the SPR with magnetic resonance (MR) imaging. METHODS A total of 124 patients underwent thin-slice MR imaging examinations with T2-weighted imaging and the constructive interference steady-state (CISS) sequence. Imaging data were transferred to a workstation for analysis. RESULTS The pineal gland (P) was delineated in 99% of the patients on T2-weighted imaging and 100% of the patients on the CISS sequence. In contrast, the SPR was identified in 27% of the patients on T2-weighted imaging and 82% of the patients on the CISS sequence. The location of the P relative to the lowest point of the splenium was roughly classified into two types. Of them, the anterior P location was the more frequent type and observed in 73% of the patients. The angle formed by the roof and floor of the SPR showed remarkable interindividual diversity. A membranous posterior extension with variable length, spanning between the posterosuperior margin of the P and Galenic complex was found in 55% of the identified SPRs on T2-weighted imaging and 45% on the CISS sequence. CONCLUSIONS The SPR is a distinct structure with diversity in appearance among individuals but commonly extends posterior to the P. High-resolution MR imaging is useful for delineating the SPR in vivo.
Collapse
Affiliation(s)
- Satoshi Tsutsumi
- Department of Neurological Surgery, Juntendo University Urayasu Hospital, 2-1-1 Tomioka, Urayasu, Chiba, 279-0021, Japan.
| | - Hideo Ono
- Division of Radiological Technology, Medical Satellite Yaesu Clinic, Tokyo, Japan
| | - Yukimasa Yasumoto
- Department of Neurological Surgery, Juntendo University Urayasu Hospital, 2-1-1 Tomioka, Urayasu, Chiba, 279-0021, Japan
| |
Collapse
|
14
|
Scholtens RM, de Rooij SEJA, Vellekoop AE, Vrouenraets BC, van Munster BC. Preoperative CSF Melatonin Concentrations and the Occurrence of Delirium in Older Hip Fracture Patients: A Preliminary Study. PLoS One 2016; 11:e0167621. [PMID: 27936113 PMCID: PMC5147935 DOI: 10.1371/journal.pone.0167621] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Accepted: 11/17/2016] [Indexed: 01/08/2023] Open
Abstract
Background Delirium is characterized by disturbances in circadian rhythm. Melatonin regulates our circadian rhythm. Our aim was to compare preoperative cerebrospinal fluid (CSF) melatonin levels in patients with and without postoperative delirium. Methods Prospective cohort study with hip fracture patients ≥ 65 years who were acutely admitted to the hospital for surgical treatment and received spinal anaesthesia. CSF was collected after cannulation, before administering anaesthetics. Melatonin was measured by radioimmunoassay (RIA). Data on delirium was obtained from medical and nursing records. Nurses screened every shift for delirium using the Delirium Observation Screening Scale (DOSS). If the DOSS was ≥3, a psychiatrist was consulted to diagnose possible delirium using the DSM-IV criteria. At admission, demographic data, medical history, and information on functional and cognitive status was obtained. Results Seventy-six patients met the inclusion criteria. Sixty patients were included in the analysis. Main reasons for exclusion were technical difficulties, insufficient CSF or exogenous melatonin use. Thirteen patients (21.7%) experienced delirium during hospitalisation. Baseline characteristics did not differ between patients with and without postoperative delirium. In patients with and without postoperative delirium melatonin levels were 12.88 pg/ml (SD 6.3) and 11.72 pg/ml (SD 4.5) respectively, p-value 0.47. No differences between patients with and without delirium were found in mean melatonin levels in analyses stratified for cognitive impairment or age. Conclusion Preoperative CSF melatonin levels did not differ between patients with and without postoperative delirium. This suggests that, if disturbances in melatonin secretion occur, these might occur after surgery due to postoperative inflammation.
Collapse
Affiliation(s)
- Rikie M. Scholtens
- Academic Medical Center, University of Amsterdam, Department of Internal Medicine, Geriatrics section, Amsterdam, The Netherlands
- * E-mail:
| | - Sophia E. J. A. de Rooij
- Academic Medical Center, University of Amsterdam, Department of Internal Medicine, Geriatrics section, Amsterdam, The Netherlands
- University Medical Center Groningen, University Centre for Geriatric Medicine, Groningen, The Netherlands
| | | | - Bart C. Vrouenraets
- Sint Lucas Andreas Hospital, Department of Surgery, Amsterdam, The Netherlands
| | - Barbara C. van Munster
- University Medical Center Groningen, University Centre for Geriatric Medicine, Groningen, The Netherlands
- Gelre Hospitals, Department of Geriatrics, Apeldoorn, The Netherlands
| |
Collapse
|
15
|
Yu N, Sun YT, Su XM, He M, Dai B, Kang J. Melatonin attenuates TGFβ1-induced epithelial-mesenchymal transition in lung alveolar epithelial cells. Mol Med Rep 2016; 14:5567-5572. [PMID: 27878256 DOI: 10.3892/mmr.2016.5950] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 07/01/2016] [Indexed: 11/06/2022] Open
Abstract
Idiopathic pulmonary fibrosis (IPF) is the most common interstitial lung disease. However, the pathogenesis remains to be fully elucidated. Melatonin is secreted by the pineal gland, it has a strong antioxidant effect, and exerts an anti-fibrosis effect. Whether melatonin attenuates pulm -onary fibrosis by inhibiting epithelial‑mesenchymal transition (EMT) requires further research. The present study aimed to investigate whether melatonin prevents transforming growth factor‑β1 (TGF‑β1)‑induced EMT and underlying signaling pathways using reverse transcription‑quantitative polymerase chain reaction, western blot analysis and immunofluorescence. The results demonstrated that melatonin inhibits EMT in A549 cells, and the Wnt/β‑catenin and Smad2/3 signaling pathways are involved in the EMT of the A549 cell line as they were suppressed by melatonin. The present study indicates that melatonin inhibited TGFβ1‑induced epithelial‑mesenchymal transition in the A549 cell line and may potentially be useful in the treatment of IPF.
Collapse
Affiliation(s)
- Na Yu
- Department of Respiratory Medicine, The First Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Yi-Tian Sun
- Department of Respiratory Medicine, Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu 221002, P.R. China
| | - Xin-Ming Su
- Department of Respiratory Medicine, The First Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Miao He
- Environment and Non‑Communicable Disease Research Center, School of Public Health, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Bing Dai
- Department of Respiratory Medicine, The First Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Jian Kang
- Department of Respiratory Medicine, The First Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
| |
Collapse
|
16
|
Acuña-Castroviejo D, Escames G, Venegas C, Díaz-Casado ME, Lima-Cabello E, López LC, Rosales-Corral S, Tan DX, Reiter RJ. Extrapineal melatonin: sources, regulation, and potential functions. Cell Mol Life Sci 2014; 71:2997-3025. [PMID: 24554058 PMCID: PMC11113552 DOI: 10.1007/s00018-014-1579-2] [Citation(s) in RCA: 699] [Impact Index Per Article: 69.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Revised: 01/26/2014] [Accepted: 01/27/2014] [Indexed: 12/15/2022]
Abstract
Endogenous melatonin is synthesized from tryptophan via 5-hydroxytryptamine. It is considered an indoleamine from a biochemical point of view because the melatonin molecule contains a substituted indolic ring with an amino group. The circadian production of melatonin by the pineal gland explains its chronobiotic influence on organismal activity, including the endocrine and non-endocrine rhythms. Other functions of melatonin, including its antioxidant and anti-inflammatory properties, its genomic effects, and its capacity to modulate mitochondrial homeostasis, are linked to the redox status of cells and tissues. With the aid of specific melatonin antibodies, the presence of melatonin has been detected in multiple extrapineal tissues including the brain, retina, lens, cochlea, Harderian gland, airway epithelium, skin, gastrointestinal tract, liver, kidney, thyroid, pancreas, thymus, spleen, immune system cells, carotid body, reproductive tract, and endothelial cells. In most of these tissues, the melatonin-synthesizing enzymes have been identified. Melatonin is present in essentially all biological fluids including cerebrospinal fluid, saliva, bile, synovial fluid, amniotic fluid, and breast milk. In several of these fluids, melatonin concentrations exceed those in the blood. The importance of the continual availability of melatonin at the cellular level is important for its physiological regulation of cell homeostasis, and may be relevant to its therapeutic applications. Because of this, it is essential to compile information related to its peripheral production and regulation of this ubiquitously acting indoleamine. Thus, this review emphasizes the presence of melatonin in extrapineal organs, tissues, and fluids of mammals including humans.
Collapse
Affiliation(s)
- Darío Acuña-Castroviejo
- Instituto de Biotecnología, Centro de Investigación Biomédica, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, Avda. del Conocimiento s/n, Armilla, 18100, Granada, Spain,
| | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Leston J, Harthé C, Mottolese C, Mertens P, Sindou M, Claustrat B. Is pineal melatonin released in the third ventricle in humans? A study in movement disorders. Neurochirurgie 2014; 61:85-9. [PMID: 24975205 DOI: 10.1016/j.neuchi.2013.04.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Accepted: 04/12/2013] [Indexed: 11/29/2022]
Abstract
In order to determine sources and metabolism of melatonin in human cerebrospinal fluid (CSF), melatonin and 6-sulfatoxymelatonin (aMT6S) concentrations were measured in CSF sampled during neurosurgery in both lateral and third ventricles in patients displaying movement disorder (Parkinson's disease, essential tremor, dystonia or dyskinesia) and compared with their plasma levels. Previous determinations in nocturnal urine had showed that the patients displayed melatonin excretion in the normal range, compared with healthy controls matched according to age. A significant difference in melatonin concentration was observed between lateral and third ventricles, with the highest levels in the third ventricle (8.75±2.75pg/mL vs. 3.20±0.33pg/mL, P=0.01). CSF aMT6s levels were similar in both ventricles and of low magnitude, less than 5pg/mL. They were not correlated with melatonin levels or influenced by the area of sampling. Melatonin levels were significantly higher in third ventricle than in the plasma, whereas there was no difference between plasma and lateral ventricle levels. These findings show that melatonin may enter directly the CSF through the pineal recess in humans. The physiological meaning of these data remains to be elucidated.
Collapse
Affiliation(s)
- J Leston
- Neurosurgical Unit A, P.-Wertheimer Hospital, Bron, France; Inserm, U846, Department of Chronobiology, Stem Cell and Brain Research Institute, Bron, France
| | - C Harthé
- Hormone Laboratory, Centre of Nuclear Medicine, Department of Chronobiology, Stem Cell and Brain Research Institute, Groupement Hospitalier Est, 59, boulevard Pinel, 69677 Bron, France
| | - C Mottolese
- Neurosurgical Unit B, P.-Wertheimer Hospital, Bron, France
| | - P Mertens
- Neurosurgical Unit A, P.-Wertheimer Hospital, Bron, France
| | - M Sindou
- Neurosurgical Unit A, P.-Wertheimer Hospital, Bron, France
| | - B Claustrat
- Hormone Laboratory, Centre of Nuclear Medicine, Department of Chronobiology, Stem Cell and Brain Research Institute, Groupement Hospitalier Est, 59, boulevard Pinel, 69677 Bron, France; Inserm, U846, Department of Chronobiology, Stem Cell and Brain Research Institute, Bron, France.
| |
Collapse
|
18
|
Crooke A, Guzman-Aranguez A, Mediero A, Alarma-Estrany P, Carracedo G, Pelaez T, Peral A, Pintor J. Effect of melatonin and analogues on corneal wound healing: involvement of Mt2 melatonin receptor. Curr Eye Res 2014; 40:56-65. [PMID: 24892818 DOI: 10.3109/02713683.2014.914540] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
PURPOSE We have investigated the effect of melatonin and its analogues on rabbit corneal epithelial wound healing. METHODS New Zealand rabbits were anaesthetised and wounds were made by placing Whatman paper discs soaked in n-heptanol on the cornea. Melatonin and analogues (all 10 nmol) were instilled. Wound diameter was measured every 2 hours by means of fluorescein application with a Topcon SL-8Z slit lamp. Melatonin antagonists (all 10 nmol) were applied 2 hours before the application of the n-heptanol-soaked disc and then every 6 hours together with melatonin. To confirm the presence of MT2 receptors in corneal epithelial cells immunohistochemistry, Western blot and RT-PCR assays in native tissue and in rabbit corneal epithelial cells were performed. The tear components were extracted then processed by HPLC to quantify melatonin in tears. RESULTS Migration assays revealed that melatonin and particularly the treatment with the MT2 agonist IIK7, accelerated the rate of healing (p < 0.001). The application of the non-selective melatonin receptor antagonist luzindole and the MT2 antagonist DH97 (but not prazosin), prevented the effect of melatonin on wound healing (both p < 0.001). Immunohistochemistry, Western blot and RT-PCR assays showed the presence of MT2 melatonin receptor in corneal epithelial cells. In addition, we have identified melatonin in tears and determined its daily variations. CONCLUSIONS These data suggest that MT2 receptors are implicated in the effect of melatonin on corneal wound healing regulating migration rate. This suggests the potential use of melatonin and its analogues to enhance epithelial wound healing in ocular surface disease.
Collapse
Affiliation(s)
- Almudena Crooke
- Departamento de Bioquímica y Biología Molecular IV, Facultad de Óptica y Optometría, Universidad Complutense de Madrid , Madrid , Spain , and
| | | | | | | | | | | | | | | |
Collapse
|
19
|
Legros C, Chesneau D, Boutin JA, Barc C, Malpaux B. Melatonin from cerebrospinal fluid but not from blood reaches sheep cerebral tissues under physiological conditions. J Neuroendocrinol 2014; 26:151-63. [PMID: 24460899 DOI: 10.1111/jne.12134] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2013] [Revised: 01/15/2014] [Accepted: 01/20/2014] [Indexed: 11/29/2022]
Abstract
The pineal gland secretes melatonin (MLT) that circulates in the blood and cerebrospinal fluid (CSF). We provide data to support the hypothesis that, in sheep and possibly in humans, only the CSF MLT, and not the blood MLT, can provide most of MLT to the cerebral tissue in high concentrations, particularly in the periventricular area. The MLT content of sheep brain, our chosen animal model, was found in significant concentration gradients oriented from the ventricle (close to the CSF) to the cerebral tissue, with concentrations varying by a factor of 1-125. The highest concentrations were observed close to the ventricle wall, whereas the lowest concentrations were furthest from the ventricles (407.0 ± 71.5 pg/ml compared to 84.7 ± 5.2 pg/ml around the third ventricle). This concentration gradient was measured in brain tissue collected at mid-day and at the end of the night. Nocturnal concentrations were higher than daytime concentrations, reflecting the diurnal variation in the pineal gland. The concentration gradient was not detected when MLT was delivered to the brain via the bloodstream. The diffusion of MLT to cerebral tissues via CSF was supported by in vivo scintigraphy and autoradiography. 2-[(123)I]-MLT infused into the CSF quickly and efficiently diffused into the brain tissues, whereas [(123)I]-iodine (control) was mostly washed away by the CSF flow and [(123)I]-bovine serum albumin remained mostly in the CSF. Taken together, these data support a critical role of CSF in providing the brain with MLT.
Collapse
Affiliation(s)
- C Legros
- INRA, UMR85 Physiologie de la Reproduction et des Comportements, Nouzilly, France; CNRS, UMR7247, Nouzilly, France; Université François Rabelais de Tours, Tours, France; IFCE, Nouzilly, France
| | | | | | | | | |
Collapse
|
20
|
Delivery of pineal melatonin to the brain and SCN: role of canaliculi, cerebrospinal fluid, tanycytes and Virchow–Robin perivascular spaces. Brain Struct Funct 2014; 219:1873-87. [DOI: 10.1007/s00429-014-0719-7] [Citation(s) in RCA: 104] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Accepted: 01/28/2014] [Indexed: 12/17/2022]
|
21
|
Alvarez-García V, González A, Alonso-González C, Martínez-Campa C, Cos S. Antiangiogenic effects of melatonin in endothelial cell cultures. Microvasc Res 2013; 87:25-33. [PMID: 23473980 DOI: 10.1016/j.mvr.2013.02.008] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 02/01/2013] [Accepted: 02/26/2013] [Indexed: 11/30/2022]
Abstract
Endothelial cells represent one of the critical cellular elements in tumor microenvironment playing a crucial role in the growth and progression of cancer through controlling angiogenesis. Vascular endothelial growth factor (VEGF) produced from tumor cells is essential for the expansion of breast cancer and may function in both paracrine and autocrine manners to promote proliferation, growth, survival and migration of endothelial cells. Since melatonin regulates tumor microenvironment by decreasing the secretion of VEGF by malignant epithelial cells and also regulates VEGF expression in human breast cancer cells, the aim of the present study was to investigate the anti-angiogenic activity of melatonin against the pro-angiogenic effects of breast cancer cells. In this work, we demonstrate that melatonin strongly inhibited the proliferation as well as invasion/migration of human umbilical vein endothelial cells (HUVECs). Melatonin disrupted tube formation and counteracted the VEGF-stimulated tubular network formation by HUVEC. In addition, conditioned media collected from human breast cancer cells were angiogenically active and stimulated tubule length formation and this effect was significantly counteracted by the addition of anti-VEGF or melatonin. Melatonin also disintegrated preformed capillary network. All these findings demonstrate that melatonin may play a role in the paracrine interactions that take place between malignant epithelial cells and proximal endothelial cells. Melatonin could be important in reducing endothelial cell proliferation, invasion, migration and tube formation, through a downregulatory action on VEGF. Taken together, our findings suggest that melatonin could potentially be beneficial as an antiangiogenic agent in breast cancer with possible future clinical applications.
Collapse
Affiliation(s)
- Virginia Alvarez-García
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria, 39011 Santander Spain
| | | | | | | | | |
Collapse
|
22
|
Alvarez-García V, González A, Martínez-Campa C, Alonso-González C, Cos S. Melatonin modulates aromatase activity and expression in endothelial cells. Oncol Rep 2013; 29:2058-64. [PMID: 23450505 DOI: 10.3892/or.2013.2314] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Accepted: 02/04/2013] [Indexed: 11/05/2022] Open
Abstract
Melatonin is known to suppress the development of endocrine-responsive breast cancers by interacting with the estrogen signaling pathways. Paracrine interactions between malignant epithelial cells and proximal stromal cells are responsible for local estrogen biosynthesis. In human breast cancer cells and peritumoral adipose tissue, melatonin downregulates aromatase, which transforms androgens into estrogens. The presence of aromatase on endothelial cells indicates that endothelial cells may contribute to tumor growth by producing estrogens. Since human umbilical vein endothelial cells (HUVECs) express both aromatase and melatonin receptors, the aim of the present study was to evaluate the ability of melatonin to regulate the activity and expression of aromatase on endothelial cells, thus, modulating local estrogen biosynthesis. In the present study, we demonstrated that melatonin inhibits the growth of HUVECs and reduces the local biosynthesis of estrogens through the downregulation of aromatase. These results are supported by three lines of evidence. Firstly, 1 mM of melatonin counteracted the testosterone-induced cell proliferation of HUVECs, which is dependent on the local biosynthesis of estrogens from testosterone by the aromatase activity of the cells. Secondly, we found that 1 mM of melatonin reduced the aromatase activity of HUVECs. Finally, by real‑time RT-PCR, we demonstrated that melatonin significantly downregulated the expression of aromatase as well as its endothelial-specific aromatase promoter region I.7. We conclude that melatonin inhibits aromatase activity and expression in HUVECs by regulating gene expression of specific aromatase promoter regions, thereby reducing the local production of estrogens.
Collapse
Affiliation(s)
- Virginia Alvarez-García
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria, 39011 Santander, Spain
| | | | | | | | | |
Collapse
|
23
|
Korkmaz A, Ma S, Topal T, Rosales-Corral S, Tan DX, Reiter RJ. Glucose: a vital toxin and potential utility of melatonin in protecting against the diabetic state. Mol Cell Endocrinol 2012; 349:128-37. [PMID: 22079284 DOI: 10.1016/j.mce.2011.10.013] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Accepted: 10/14/2011] [Indexed: 12/29/2022]
Abstract
The molecular mechanisms including elevated oxidative and nitrosative reactants, activation of pro-inflammatory transcription factors and subsequent inflammation appear as a unified pathway leading to metabolic deterioration resulting from hyperglycemia, dyslipidemia, and insulin resistance. Consistent evidence reveals that chronically-elevated blood glucose initiates a harmful series of processes in which toxic reactive species play crucial roles. As a consequence, the resulting nitro-oxidative stress harms virtually all biomolecules including lipids, proteins and DNA leading to severely compromised metabolic activity. Melatonin is a multifunctional indoleamine which counteracts several pathophysiologic steps and displays significant beneficial effects against hyperglycemia-induced cellular toxicity. Melatonin has the capability of scavenging both oxygen and nitrogen-based reactants and blocking transcriptional factors which induce pro-inflammatory cytokines. These functions contribute to melatonin's antioxidative, anti-inflammatory and possibly epigenetic regulatory properties. Additionally, melatonin restores adipocyte glucose transporter-4 loss and eases the effects of insulin resistance associated with the type 2 diabetic state and may also assist in the regulation of body weight in these patients. Current knowledge suggests the clinical use of this non-toxic indoleamine in conjunction with other treatments for inhibition of the negative consequences of hyperglycemia for reducing insulin resistance and for regulating the diabetic state.
Collapse
Affiliation(s)
- Ahmet Korkmaz
- Department of Physiology, School of Medicine, Gulhane Military Medical Academy, Ankara, Turkey
| | | | | | | | | | | |
Collapse
|
24
|
Stehle JH, Saade A, Rawashdeh O, Ackermann K, Jilg A, Sebestény T, Maronde E. A survey of molecular details in the human pineal gland in the light of phylogeny, structure, function and chronobiological diseases. J Pineal Res 2011; 51:17-43. [PMID: 21517957 DOI: 10.1111/j.1600-079x.2011.00856.x] [Citation(s) in RCA: 306] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The human pineal gland is a neuroendocrine transducer that forms an integral part of the brain. Through the nocturnally elevated synthesis and release of the neurohormone melatonin, the pineal gland encodes and disseminates information on circadian time, thus coupling the outside world to the biochemical and physiological internal demands of the body. Approaches to better understand molecular details behind the rhythmic signalling in the human pineal gland are limited but implicitly warranted, as human chronobiological dysfunctions are often associated with alterations in melatonin synthesis. Current knowledge on melatonin synthesis in the human pineal gland is based on minimally invasive analyses, and by the comparison of signalling events between different vertebrate species, with emphasis put on data acquired in sheep and other primates. Together with investigations using autoptic pineal tissue, a remnant silhouette of premortem dynamics within the hormone's biosynthesis pathway can be constructed. The detected biochemical scenario behind the generation of dynamics in melatonin synthesis positions the human pineal gland surprisingly isolated. In this neuroendocrine brain structure, protein-protein interactions and nucleo-cytoplasmic protein shuttling indicate furthermore a novel twist in the molecular dynamics in the cells of this neuroendocrine brain structure. These findings have to be seen in the light that an impaired melatonin synthesis is observed in elderly and/or demented patients, in individuals affected by Alzheimer's disease, Smith-Magenis syndrome, autism spectrum disorder and sleep phase disorders. Already, recent advances in understanding signalling dynamics in the human pineal gland have significantly helped to counteract chronobiological dysfunctions through a proper restoration of the nocturnal melatonin surge.
Collapse
Affiliation(s)
- Jörg H Stehle
- Institute of Anatomy III (Cellular and Molecular Anatomy), Goethe-University Frankfurt, Frankfurt, Germany.
| | | | | | | | | | | | | |
Collapse
|
25
|
Tan DX, Manchester LC, Sanchez-Barcelo E, Mediavilla MD, Reiter RJ. Significance of high levels of endogenous melatonin in Mammalian cerebrospinal fluid and in the central nervous system. Curr Neuropharmacol 2011; 8:162-7. [PMID: 21358967 PMCID: PMC3001210 DOI: 10.2174/157015910792246182] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2010] [Revised: 04/15/2010] [Accepted: 04/20/2010] [Indexed: 02/07/2023] Open
Abstract
Levels of melatonin in mammalian circulation are well documented; however, its levels in tissues and other body fluids are yet only poorly established. It is obvious that melatonin concentrations in cerebrospinal fluid (CSF) of mammals including humans are substantially higher than those in the peripheral circulation. Evidence indicates that melatonin produced in pineal gland is directly released into third ventricle via the pineal recess. In addition, brain tissue is equipped with the synthetic machinery for melatonin production and the astrocytes and glial cells have been proven to produce melatonin. These two sources of melatonin may be responsible for its high levels in CNS. The physiological significance of the high levels of melatonin in CNS presumably is to protect neurons and glia from oxidative stress. Melatonin as a potent antioxidant has been reported to be a neuroprotector in animals and in clinical studies. It seems that long term melatonin administration which elevates CSF melatonin concentrations will retard the progression of neurodegenerative disorders, for example, Alzheimer disease.
Collapse
Affiliation(s)
- Dun-Xian Tan
- Department of Cellular & Structural Biology, University of Texas, Health Science Center, at San Antonio, 7703 Floyd Curl, San Antonio, TX, 78229, USA
| | | | | | | | | |
Collapse
|
26
|
Bonnefont-Rousselot D, Collin F. Melatonin: Action as antioxidant and potential applications in human disease and aging. Toxicology 2010; 278:55-67. [DOI: 10.1016/j.tox.2010.04.008] [Citation(s) in RCA: 222] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2010] [Revised: 04/09/2010] [Accepted: 04/16/2010] [Indexed: 12/14/2022]
|
27
|
Melatonin is released in the third ventricle in humans. A study in movement disorders. Neurosci Lett 2009; 469:294-7. [PMID: 20004701 DOI: 10.1016/j.neulet.2009.12.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2009] [Revised: 11/26/2009] [Accepted: 12/03/2009] [Indexed: 11/20/2022]
Abstract
In order to determine sources and metabolism of melatonin in human cerebrospinal fluid (CSF), melatonin and 6-sulfatoxymelatonin (aMT6S) concentrations were measured in CSF sampled during neurosurgery in both lateral and third ventricles in patients displaying movement disorder (Parkinson's disease, essential tremor, dystonia or dyskinesia) and compared with their plasma levels. Previous determinations in nocturnal urine had showed that the patients displayed melatonin excretion in the normal range, compared with healthy controls matched according to age. A significant difference in melatonin concentration was observed between lateral and third ventricles, with the highest levels in the third ventricle (8.75+/-2.75 pg/ml vs. 3.20+/-0.33 pg/ml, p=0.01). CSF aMT6s levels were similar in both ventricles and of low magnitude, less than 5 pg/ml. They were not correlated with melatonin levels or influenced by the area of sampling. Melatonin levels were significantly higher in third ventricle than in the plasma, whereas there was no difference between plasma and lateral ventricle levels. These findings show that melatonin may enter directly the CSF through the pineal recess in humans. The physiological meaning of these data remains to be elucidated.
Collapse
|
28
|
Abstract
Although the human genome has remained unchanged over the last 10,000 years, our lifestyle has become progressively more divergent from those of our ancient ancestors. This maladaptive change became apparent with the Industrial Revolution and has been accelerating in recent decades. Socially, we are people of the 21st century, but genetically we remain similar to our early ancestors. In conjunction with this discordance between our ancient, genetically-determined biology and the nutritional, cultural and activity patterns in contemporary Western populations, many diseases have emerged. Only a century ago infectious disease was a major cause of mortality, whereas today non-infectious chronic diseases are the greatest cause of death in the world. Epidemics of metabolic diseases (e.g., cardiovascular diseases, type 2 diabetes, obesity, metabolic syndrome and certain cancers) have become major contributors to the burden of poor health and they are presently emerging or accelerating, in most developing countries. One major lifestyle consequence is light at night and subsequent disrupted circadian rhythms commonly referred to as circadian disruption or chronodisruption. Mounting evidence reveals that particularly melatonin rhythmicity has crucial roles in a variety of metabolic functions as an anti-oxidant, anti-inflammatory chronobiotic and possibly as an epigenetic regulator. This paper provides a brief outline about metabolic dysregulation in conjunction with a disrupted melatonin rhythm.
Collapse
Affiliation(s)
- Ahmet Korkmaz
- Department of Physiology, School of Medicine, Gulhane Military Medical Academy, Ankara, Turkey
| | | | | | | |
Collapse
|
29
|
Abstract
A male, 34 years of age, suffers from headaches, red and watery eyes. The headaches began in childhood; the frequency of headaches has increased over the years and in the last decade headaches have occurred on a daily basis. If he wakes up before sunrise he feels much better and free of a headache; however, once he continues to sleep during and after sunrise, he suffers from tiredness, headache and nervousness. On magnetic resonance imaging (MRI), benign neuroepithelial cysts or a chronic infarct area was reported at the junction of the left medio-lateral zone of hypothalamus. After repeated MRI examinations, it was decided that the lesion on the left medio-lateral zone of hypothalamus may have disrupted the pineal gland and changed melatonin secretion. It was decided to treat him with 3 mg melatonin daily before going to bed. After a week of treatment, the patient reported that he felt very fresh and was virtually free of headaches.
Collapse
Affiliation(s)
- UH Ulas
- Gülhane Military
Medical Academy, Neurology Department, Turkey
| | - A Korkmaz
- Department of Cellular and
Structural Biology, University of Texas Health Science Center, San Antonio, TX,
USA
| | - O Karadas
- Gülhane Military
Medical Academy, Neurology Department, Turkey
| | - Z Odabasi
- Gülhane Military
Medical Academy, Neurology Department, Turkey
| | - RJ Reiter
- Department of Cellular and
Structural Biology, University of Texas Health Science Center, San Antonio, TX,
USA
| |
Collapse
|
30
|
|
31
|
Seifman MA, Adamides AA, Nguyen PN, Vallance SA, Cooper DJ, Kossmann T, Rosenfeld JV, Morganti-Kossmann MC. Endogenous melatonin increases in cerebrospinal fluid of patients after severe traumatic brain injury and correlates with oxidative stress and metabolic disarray. J Cereb Blood Flow Metab 2008; 28:684-96. [PMID: 18183032 DOI: 10.1038/sj.jcbfm.9600603] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Oxidative stress plays a significant role in secondary damage after severe traumatic brain injury (TBI); and melatonin exhibits both direct and indirect antioxidant effects. Melatonin deficiency is deleterious in TBI animal models, and its administration confers neuroprotection, reducing cerebral oedema, and improving neurobehavioural outcome. This study aimed to measure the endogenous cerebrospinal fluid (CSF) and serum melatonin levels post-TBI in humans and to identify relationships with markers of oxidative stress via 8-isoprostaglandin-F2alpha (isoprostane), brain metabolism and neurologic outcome. Cerebrospinal fluid and serum samples of 39 TBI patients were assessed for melatonin, isoprostane, and various metabolites. Cerebrospinal fluid but not serum melatonin levels were markedly elevated (7.28+/-0.92 versus 1.47+/-0.35 pg/mL, P<0.0005). Isoprostane levels also increased in both CSF (127.62+/-16.85 versus 18.28+/-4.88 pg/mL, P<0.0005) and serum (562.46+/-50.78 versus 126.15+/-40.08 pg/mL (P<0.0005). A strong correlation between CSF melatonin and CSF isoprostane on day 1 after injury (r=0.563, P=0.002) suggests that melatonin production increases in conjunction with lipid peroxidation in TBI. Relationships between CSF melatonin and pyruvate (r=0.369, P=0.049) and glutamate (r=0.373, P=0.046) indicate that melatonin production increases with metabolic disarray. In conclusion, endogenous CSF melatonin levels increase after TBI, whereas serum levels do not. This elevation is likely to represent a response to oxidative stress and metabolic disarray, although further studies are required to elucidate these relationships.
Collapse
Affiliation(s)
- Marc A Seifman
- National Trauma Research Institute, The Alfred, Melbourne, Victoria, Australia
| | | | | | | | | | | | | | | |
Collapse
|
32
|
González A, Martínez-Campa C, Mediavilla MD, Alonso-González C, Sánchez-Barceló EJ, Cos S. Inhibitory effects of pharmacological doses of melatonin on aromatase activity and expression in rat glioma cells. Br J Cancer 2007; 97:755-60. [PMID: 17700567 PMCID: PMC2360391 DOI: 10.1038/sj.bjc.6603935] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Melatonin exerts oncostatic effects on different kinds of neoplasias, especially on oestrogen-dependent tumours. Recently, it has been described that melatonin, on the basis of its antioxidant properties, inhibits the growth of glioma cells. Glioma cells express oestrogen receptors and have the ability to synthesise oestrogens from androgens. In the present study, we demonstrate that pharmacological concentrations of melatonin decreases the growth of C6 glioma cells and reduces the local biosynthesis of oestrogens, through the inhibition of aromatase, the enzyme that catalyses the conversion of androgens into oestrogens. These results are supported by three types of evidence. Firstly, melatonin counteracts the growth stimulatory effects of testosterone on glioma cells, which is dependent on the local synthesis of oestrogens from testosterone. Secondly, we found that melatonin reduces the aromatase activity of C6 cells, measured by the tritiated water release assay. Finally, by (RT)–PCR, we found that melatonin downregulates aromatase mRNA steady-state levels in these glioma cells. We conclude that melatonin inhibits the local production of oestrogens decreasing aromatase activity and expression. By analogy to the implications of aromatase in other forms of oestrogen-sensitive tumours, it is conceivable that the modulation of the aromatase by pharmacological melatonin may play a role in the growth of glioblastomas.
Collapse
Affiliation(s)
- A González
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria, Santander 39011, Spain
| | - C Martínez-Campa
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria, Santander 39011, Spain
| | - M D Mediavilla
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria, Santander 39011, Spain
| | - C Alonso-González
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria, Santander 39011, Spain
| | - E J Sánchez-Barceló
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria, Santander 39011, Spain
| | - S Cos
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria, Santander 39011, Spain
- E-mail:
| |
Collapse
|