Leptin, Obesity, and Leptin Resistance: Where Are We 25 Years Later?

Leptin, a hormone that is capable of effectively reducing food intake and body weight, was initially considered for use in the treatment of obesity. However, obese subjects have since been found to have high levels of circulating leptin and to be insensitive to the exogenous administration of leptin...

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Published inNutrients Vol. 11; no. 11; p. 2704
Main Authors Izquierdo, Andrea G., Crujeiras, Ana B., Casanueva, Felipe F., Carreira, Marcos C.
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 08.11.2019
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Abstract Leptin, a hormone that is capable of effectively reducing food intake and body weight, was initially considered for use in the treatment of obesity. However, obese subjects have since been found to have high levels of circulating leptin and to be insensitive to the exogenous administration of leptin. The inability of leptin to exert its anorexigenic effects in obese individuals, and therefore, the lack of clinical utility of leptin in obesity, is defined as leptin resistance. This phenomenon has not yet been adequately characterized. Elucidation of the molecular mechanisms underlying leptin resistance is of vital importance for the application of leptin as an effective treatment for obesity. Leptin must cross the blood–brain barrier (BBB) to reach the hypothalamus and exert its anorexigenic functions. The mechanisms involved in leptin transportation across the blood–brain barrier continue to be unclear, thereby preventing the clinical application of leptin in the treatment of obesity. In recent years, new strategies have been developed to recover the response to leptin in obesity. We have summarized these strategies in this review.
AbstractList Leptin, a hormone that is capable of effectively reducing food intake and body weight, was initially considered for use in the treatment of obesity. However, obese subjects have since been found to have high levels of circulating leptin and to be insensitive to the exogenous administration of leptin. The inability of leptin to exert its anorexigenic effects in obese individuals, and therefore, the lack of clinical utility of leptin in obesity, is defined as leptin resistance. This phenomenon has not yet been adequately characterized. Elucidation of the molecular mechanisms underlying leptin resistance is of vital importance for the application of leptin as an effective treatment for obesity. Leptin must cross the blood–brain barrier (BBB) to reach the hypothalamus and exert its anorexigenic functions. The mechanisms involved in leptin transportation across the blood–brain barrier continue to be unclear, thereby preventing the clinical application of leptin in the treatment of obesity. In recent years, new strategies have been developed to recover the response to leptin in obesity. We have summarized these strategies in this review.
Leptin, a hormone that is capable of effectively reducing food intake and body weight, was initially considered for use in the treatment of obesity. However, obese subjects have since been found to have high levels of circulating leptin and to be insensitive to the exogenous administration of leptin. The inability of leptin to exert its anorexigenic effects in obese individuals, and therefore, the lack of clinical utility of leptin in obesity, is defined as leptin resistance. This phenomenon has not yet been adequately characterized. Elucidation of the molecular mechanisms underlying leptin resistance is of vital importance for the application of leptin as an effective treatment for obesity. Leptin must cross the blood-brain barrier (BBB) to reach the hypothalamus and exert its anorexigenic functions. The mechanisms involved in leptin transportation across the blood-brain barrier continue to be unclear, thereby preventing the clinical application of leptin in the treatment of obesity. In recent years, new strategies have been developed to recover the response to leptin in obesity. We have summarized these strategies in this review.Leptin, a hormone that is capable of effectively reducing food intake and body weight, was initially considered for use in the treatment of obesity. However, obese subjects have since been found to have high levels of circulating leptin and to be insensitive to the exogenous administration of leptin. The inability of leptin to exert its anorexigenic effects in obese individuals, and therefore, the lack of clinical utility of leptin in obesity, is defined as leptin resistance. This phenomenon has not yet been adequately characterized. Elucidation of the molecular mechanisms underlying leptin resistance is of vital importance for the application of leptin as an effective treatment for obesity. Leptin must cross the blood-brain barrier (BBB) to reach the hypothalamus and exert its anorexigenic functions. The mechanisms involved in leptin transportation across the blood-brain barrier continue to be unclear, thereby preventing the clinical application of leptin in the treatment of obesity. In recent years, new strategies have been developed to recover the response to leptin in obesity. We have summarized these strategies in this review.
Several studies have shown that obese mice are sensitive to intracerebro-ventricular (ICV), but not subcutaneous or intraperitoneal (IP), or the administration of leptin [15,16], indicating that the lack of leptin activity is due to 35% decrease in BBB permeability [10]. [...]the cerebrospinal fluid/serum leptin ratio in obese humans is 4–5 times lower [17,18]. The entry of leptin into the brain is partially saturable [20], which indicates the involvement of a protein transporter. [...]leptin transport by tanycytes in the MHB requires the presence of the leptin receptor (OBR) [21] as well as the short isoforms of the receptor (OBRa and OBRc) [22,23,24,25,26], which are highly expressed in the BBB. [...]therapies that mobilize the OBR from intracellular pools and allow for increased OBR on the cell surface might be useful in achieving greater sensitivity to leptin in obesity. Other compounds such as fluvoxamine, a serotonin reuptake inhibitor, and flurbiprofen, a molecule with anti-inflammatory capacity, are able to reduce ER stress and leptin resistance along with causing weight loss in murine models [90,91]. Because various neuropeptides can be delivered into the central nervous system through an intranasal administration route, intranasal leptin might prove an effective treatment approach for obesity.
Author Carreira, Marcos C.
Casanueva, Felipe F.
Crujeiras, Ana B.
Izquierdo, Andrea G.
AuthorAffiliation 2 CIBER de Fisiopatologia de la Obesidad y Nutricion (CIBERobn), Instituto Salud Carlos III, 28029 Madrid, Spain
4 Molecular Endocrinolgy, Universidad de Santiago de Compostela (USC), 15706 Santiago de Compostela, Spain
1 Laboratory of Epigenomics in Endocrinology and Nutrition, Epigenomics Unit, Instituto de Investigacion Sanitaria de Santiago (IDIS), Complejo Hospitalario Universitario de Santiago (CHUS/SERGAS), 15706 Santiago de Compostela, Spain; andrea.gonzalez.izquierdo@hotmail.com (A.G.I.); anabelencrujeiras@hotmail.com (A.B.C.)
3 Laboratory of Molecular Endocrinology, Instituto de Investigacion Sanitaria de Santiago (IDIS), Complejo Hospitalario Universitario de Santiago (CHUS), 15706 Santiago de Compostela, Spain
AuthorAffiliation_xml – name: 2 CIBER de Fisiopatologia de la Obesidad y Nutricion (CIBERobn), Instituto Salud Carlos III, 28029 Madrid, Spain
– name: 3 Laboratory of Molecular Endocrinology, Instituto de Investigacion Sanitaria de Santiago (IDIS), Complejo Hospitalario Universitario de Santiago (CHUS), 15706 Santiago de Compostela, Spain
– name: 1 Laboratory of Epigenomics in Endocrinology and Nutrition, Epigenomics Unit, Instituto de Investigacion Sanitaria de Santiago (IDIS), Complejo Hospitalario Universitario de Santiago (CHUS/SERGAS), 15706 Santiago de Compostela, Spain; andrea.gonzalez.izquierdo@hotmail.com (A.G.I.); anabelencrujeiras@hotmail.com (A.B.C.)
– name: 4 Molecular Endocrinolgy, Universidad de Santiago de Compostela (USC), 15706 Santiago de Compostela, Spain
Author_xml – sequence: 1
  givenname: Andrea G.
  orcidid: 0000-0002-0846-8834
  surname: Izquierdo
  fullname: Izquierdo, Andrea G.
– sequence: 2
  givenname: Ana B.
  orcidid: 0000-0003-4392-0301
  surname: Crujeiras
  fullname: Crujeiras, Ana B.
– sequence: 3
  givenname: Felipe F.
  orcidid: 0000-0002-9052-8161
  surname: Casanueva
  fullname: Casanueva, Felipe F.
– sequence: 4
  givenname: Marcos C.
  surname: Carreira
  fullname: Carreira, Marcos C.
BackLink https://www.ncbi.nlm.nih.gov/pubmed/31717265$$D View this record in MEDLINE/PubMed
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Keywords blood brain barrier
leptin resistance
leptin
obesity
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Snippet Leptin, a hormone that is capable of effectively reducing food intake and body weight, was initially considered for use in the treatment of obesity. However,...
Several studies have shown that obese mice are sensitive to intracerebro-ventricular (ICV), but not subcutaneous or intraperitoneal (IP), or the administration...
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StartPage 2704
SubjectTerms Adiposity - drug effects
Anti-Obesity Agents - therapeutic use
Blood-Brain Barrier - metabolism
Brain - drug effects
Brain - metabolism
Brain - physiopathology
Capillary Permeability
Endocrinology
Endoplasmic reticulum
Feeding Behavior - drug effects
food intake
Homeostasis
Hormones
Humans
hypothalamus
Laboratories
leptin
Leptin - metabolism
Metabolism
Nervous system
Obesity
Obesity - drug therapy
Obesity - metabolism
Obesity - physiopathology
Obesity - psychology
Proteins
Review
Signal Transduction
transportation
Weight control
Weight Gain - drug effects
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Title Leptin, Obesity, and Leptin Resistance: Where Are We 25 Years Later?
URI https://www.ncbi.nlm.nih.gov/pubmed/31717265
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Volume 11
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