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      Specific Functions of Melanocortin 3 Receptor (MC3R)

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          Abstract

          Melanocortin 3 receptor (MC3R) is a G-protein coupled receptor which has been defined mostly as a regulator of the appetite/hunger balance mechanisms to date. In addition to its function regarding the weight gain and appetite control mechanisms of MC3R, recent studies have shown that MC3R controls growth, puberty, and circadian rhythms as well. Despite the drastic effects of MC3R deficiency in humans and other mammals, its cellular mechanisms are still under investigation. In this review paper, we aimed to point out the importance of MC3R regulations in three main areas: 1) its impact on weight and appetite control, 2) its role in the control of growth, puberty, and the circadian rhythm, and, 3) its protein-protein interactions and cellular mechanisms.

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          Most cited references32

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          The genetics of obesity: from discovery to biology

          The prevalence of obesity has tripled over the past four decades, imposing an enormous burden on people’s health. Polygenic (or common) obesity and rare, severe, early-onset monogenic obesity are often polarized as distinct diseases. However, gene discovery studies for both forms of obesity show that they have shared genetic and biological underpinnings, pointing to a key role for the brain in the control of body weight. Genome-wide association studies (GWAS) with increasing sample sizes and advances in sequencing technology are the main drivers behind a recent flurry of new discoveries. However, it is the post-GWAS, cross-disciplinary collaborations, which combine new omics technologies and analytical approaches, that have started to facilitate translation of genetic loci into meaningful biology and new avenues for treatment. In this Review, Loos and Yeo summarize our current understanding of the genetic underpinnings of monogenic and polygenic obesity. They highlight the commonalities revealed by recent studies and discuss the implications for treatment and prediction of obesity risk.
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            Toward a Wiring Diagram Understanding of Appetite Control.

            Prior mouse genetic research has set the stage for a deep understanding of appetite regulation. This goal is now being realized through the use of recent technological advances, such as the ability to map connectivity between neurons, manipulate neural activity in real time, and measure neural activity during behavior. Indeed, major progress has been made with regard to meal-related gut control of appetite, arcuate nucleus-based hypothalamic circuits linking energy state to the motivational drive, hunger, and, finally, limbic and cognitive processes that bring about hunger-mediated increases in reward value and perception of food. Unexpected findings are also being made; for example, the rapid regulation of homeostatic neurons by cues that predict future food consumption. The aim of this review is to cover the major underpinnings of appetite regulation, describe recent advances resulting from new technologies, and synthesize these findings into an updated view of appetite regulation.
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              The role of proopiomelanocortin (POMC) neurones in feeding behaviour

              The precursor protein, proopiomelanocortin (POMC), produces many biologically active peptides via a series of enzymatic steps in a tissue-specific manner, yielding the melanocyte-stimulating hormones (MSHs), corticotrophin (ACTH) and β-endorphin. The MSHs and ACTH bind to the extracellular G-protein coupled melanocortin receptors (MCRs) of which there are five subtypes. The MC3R and MC4R show widespread expression in the central nervous system (CNS), whilst there is low level expression of MC1R and MC5R. In the CNS, cell bodies for POMC are mainly located in the arcuate nucleus of the hypothalamus and the nucleus tractus solitarius of the brainstem. Both of these areas have well defined functions relating to appetite and food intake. Mouse knockouts (ko) for pomc, mc4r and mc3r all show an obese phenotype, as do humans expressing mutations of POMC and MC4R. Recently, human subjects with specific mutations in β-MSH have been found to be obese too, as have mice with engineered β-endorphin deficiency. The CNS POMC system has other functions, including regulation of sexual behaviour, lactation, the reproductive cycle and possibly central cardiovascular control. However, this review will focus on feeding behaviour and link it in with the neuroanatomy of the POMC neurones in the hypothalamus and brainstem.
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                Author and article information

                Journal
                J Clin Res Pediatr Endocrinol
                J Clin Res Pediatr Endocrinol
                JCRPE
                Journal of Clinical Research in Pediatric Endocrinology
                Galenos Publishing
                1308-5727
                1308-5735
                March 2023
                27 February 2023
                : 15
                : 1
                : 1-6
                Affiliations
                [1 ]Middle East Technical University, Department of Biological Sciences, Ankara, Turkey
                [2 ]Middle East Technical University, Department of Biochemistry, Ankara, Turkey
                Author notes
                * Address for Correspondence: Middle East Technical University, Department of Biological Sciences, Ankara, Turkey Phone: +90 312 210 64 65 E-mail: tyanik@ 123456metu.edu.tr
                Author information
                https://orcid.org/0000-0002-7191-2264
                https://orcid.org/0000-0001-5710-3068
                Article
                58715
                10.4274/jcrpe.galenos.2022.2022-5-21
                9976164
                36053086
                b9b9979e-29c5-4d92-894d-2f714d4fffe4
                ©Copyright 2023 by Turkish Pediatric Endocrinology and Diabetes Society | The Journal of Clinical Research in Pediatric Endocrinology published by Galenos Publishing House.

                This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 31 May 2022
                : 31 August 2022
                Categories
                Review

                Pediatrics
                childhood obesity,melanocortin 3 receptor,circadian rhythm,appetite control
                Pediatrics
                childhood obesity, melanocortin 3 receptor, circadian rhythm, appetite control

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