1
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Freeman C, A S MD, A S P. Unraveling the Intricacies of OPG/RANKL/RANK Biology and Its Implications in Neurological Disorders-A Comprehensive Literature Review. Mol Neurobiol 2024:10.1007/s12035-024-04227-z. [PMID: 38777981 DOI: 10.1007/s12035-024-04227-z] [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: 02/03/2024] [Accepted: 05/09/2024] [Indexed: 05/25/2024]
Abstract
The OPG/RANKL/RANK framework, along with its specific receptors, plays a crucial role in bone remodeling and the functioning of the central nervous system (CNS) and associated disorders. Recent research and investigations provide evidence that the components of osteoprotegerin (OPG), receptor activator of NF-kB ligand (RANKL), and receptor activator of NF-kB (RANK) are expressed in the CNS. The CNS structure encompasses cells involved in neuroinflammation, including local macrophages, inflammatory cells, and microglia that cross the blood-brain barrier. The OPG/RANKL/RANK trio modulates the neuroinflammatory response based on the molecular context. The levels of OPG/RANKL/RANK components can serve as biomarkers in the blood and cerebrospinal fluid. They act as neuroprotectants following brain injuries and also participate in the regulation of body weight, internal body temperature, brain ischemia, autoimmune encephalopathy, and energy metabolism. Although the OPG/RANKL/RANK system is primarily known for its role in bone remodeling, further exploring deeper into its multifunctional nature can uncover new functions and novel drug targets for diseases not previously associated with OPG/RANKL/RANK signaling.
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Affiliation(s)
- Chrisanne Freeman
- Department of Biotechnology, Bishop Heber College, Tamil Nadu, Tiruchirappalli, 620017, India.
| | - Merlyn Diana A S
- Department of Biotechnology, Bishop Heber College, Tamil Nadu, Tiruchirappalli, 620017, India
- Department of Zoology and Research Centre, Lady Doak College, Tamil Nadu, Madurai, 625002, India
| | - Priscilla A S
- Department of Zoology and Research Centre, Lady Doak College, Tamil Nadu, Madurai, 625002, India
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2
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Xing B, Yu J, Zhang H, Li Y. RANKL inhibition: a new target of treating diabetes mellitus? Ther Adv Endocrinol Metab 2023; 14:20420188231170754. [PMID: 37223831 PMCID: PMC10201162 DOI: 10.1177/20420188231170754] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Accepted: 04/03/2023] [Indexed: 05/25/2023] Open
Abstract
Accumulating evidence demonstrates the link between glucose and bone metabolism. The receptor activator of nuclear factor-kB ligand (RANKL)/the receptor activator of NF-κB (RANK)/osteoprotegerin (OPG) axis is an essential signaling axis maintaining the balance between bone resorption and bone formation. In recent years, it has been found that RANKL and RANK are distributed not only in bone but also in the liver, muscle, adipose tissue, pancreas, and other tissues that may influence glucose metabolism. Some scholars have suggested that the blockage of the RANKL signaling may protect islet β-cell function and prevent diabetes; simultaneously, there also exist different views that RANKL can improve insulin resistance through inducing the beige adipocyte differentiation and increase energy expenditure. Currently, the results of the regulatory effect on glucose metabolism of RANKL remain conflicting. Denosumab (Dmab), a fully human monoclonal antibody that can bind to RANKL and prevent osteoclast formation, is a commonly used antiosteoporosis drug. Recent basic studies have found that Dmab seems to regulate glucose homeostasis and β-cell function in humanized mice or in vitro human β-cell models. Besides, some clinical data have also reported the glucometabolic effects of Dmab, however, with limited and inconsistent results. This review mainly describes the impact of the RANKL signaling pathway on glucose metabolism and summarizes clinical evidence that links Dmab and DM to seek a new therapeutic strategy for diabetes.
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Affiliation(s)
- Baodi Xing
- Department of Endocrinology, Key Laboratory of
Endocrinology of National Health Commission, Translation Medicine Center,
Peking Union Medical College Hospital, Chinese Academy of Medical Sciences
and Peking Union Medical College, Beijing, China
| | - Jie Yu
- Department of Endocrinology, Key Laboratory of
Endocrinology of National Health Commission, Translation Medicine Center,
Peking Union Medical College Hospital, Chinese Academy of Medical Sciences
and Peking Union Medical College, Beijing, China
| | - Huabing Zhang
- Department of Endocrinology, NHC Key Laboratory
of Endocrinology, Peking Union Medical College Hospital (Dongdan campus),
Chinese Academy of Medical Sciences and Peking Union Medical College, No.1
Shuaifuyuan, Wangfujing Dongcheng District, Beijing 100730, China
| | - Yuxiu Li
- Department of Endocrinology, NHC Key Laboratory
of Endocrinology, Peking Union Medical College Hospital (Dongdan campus),
Chinese Academy of Medical Sciences and Peking Union Medical College, No.1
Shuaifuyuan, Wangfujing Dongcheng District, Beijing 100730, China
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3
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Mori K, Mizokami A, Sano T, Mukai S, Hiura F, Ayukawa Y, Koyano K, Kanematsu T, Jimi E. RANKL elevation activates the NIK/NF-κB pathway, inducing obesity in ovariectomized mice. J Endocrinol 2022; 254:27-36. [PMID: 35638559 DOI: 10.1530/joe-21-0424] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 04/12/2022] [Indexed: 11/08/2022]
Abstract
Menopausal women are susceptible to visceral obesity, which increases the risk of metabolic disorders. However, the mechanisms of menopause-induced visceral fat accumulation are not fully understood. Circulating levels of receptor activator of nuclear factor-kappa B (NF-κB) ligand (RANKL) are elevated in an animal model of menopause. RANKL, a multifunctional cytokine, activates the NF-κB pathway, which serves as a pivotal mediator of inflammatory responses. Here, we investigated whether RANKL-induced non-canonical NF-κB pathway activation induces inflammation and lipid accumulation in adipose tissues. RANKL induced Tnfa expression via the non-canonical NF-κB pathway in bone marrow cells. We therefore analyzed aly/aly mice, in which the non-canonical NF-κB pathway is not activated, owing to an inactive form of NF-κB-inducing kinase. A postmenopausal obesity model was generated by ovariectomy and subsequent high-fat and high-sucrose diet feeding. In aly/aly mice with postmenopausal obesity, serum RANKL levels were elevated, and hepatic lipid accumulation and adipocyte hypertrophy were suppressed, resulting in reduced macrophage infiltration and inflammatory cytokine mRNA expression in visceral adipose tissue. Furthermore, aly/aly mice showed protection from glucose intolerance and insulin resistance, which were observed in ovariectomized WT obese mice. These findings indicate that non-canonical NF-κB pathway activation via serum RANKL elevation contributes to postmenopausal obesity.
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Affiliation(s)
- Kayo Mori
- K Mori, Laboratory of Molecular and Cellular Biochemistry, Kyushu University, Fukuoka, Japan
| | - Akiko Mizokami
- A Mizokami, Oral Health/Brain Health/Total Health Research Center, Kyushu University, Fukuoka, Japan
| | - Tomomi Sano
- T Sano, Department of Cell Biology, Aging Science, and Pharmacology, Kyushu University, Fukuoka, Japan
| | - Satoru Mukai
- S Mukai, Department of Health and Nutrition Care, University of East Asia, Shimonoseki, Japan
| | - Fumitaka Hiura
- F Hiura, Laboratory of Molecular and Cellular Biochemistry, Kyushu University, Fukuoka, Japan
| | - Yasunori Ayukawa
- Y Ayukawa, Section of Implant and Rehabilitative Dentistr, Kyushu University, Fukuoka, Japan
| | - Kiyoshi Koyano
- K Koyano, Division of Advanced Dental Devices and Therapeutics, Kyushu University, Fukuoka, Japan
| | - Takashi Kanematsu
- T Kanematsu, Department of Cell Biology, Aging Science, and Pharmacology, Kyushu University, Fukuoka, 819-0395, Japan
| | - Eijiro Jimi
- E Jimi, Oral Health/Brain Health/Total Health Research Center, Kyushu University, Fukuoka, Japan
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4
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Dai Y, Chen S, Li Y, Zhang G, Bi P, Nie K. Liujunzi Decoction ameliorated cisplatin-induced anorexia by inhibiting the JAK-STAT signaling pathway and coordinating anorexigenic and orexigenic neuropeptides in rats. JOURNAL OF ETHNOPHARMACOLOGY 2022; 285:114840. [PMID: 34800646 DOI: 10.1016/j.jep.2021.114840] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Revised: 11/03/2021] [Accepted: 11/12/2021] [Indexed: 06/13/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE As a traditional Chinese formula, Liujunzi Decoction (LJZD) originated from the Yi Xue Zheng Zhuan, and has a promising effect in treating chemotherapy-induced anorexia (CIA). AIM OF THE STUDY The present study aims to investigate whether LJZD acts on interleukin-6 (IL-6)/leptin mediated janus kinase (JAK)-signal transducer and activator of transcription (STAT) signaling pathway that regulates hypothalamus anorexigenic and orexigenic peptides to ameliorate CIA, and also elucidates the potential mechanism by metabolomic analysis. MATERIALS AND METHODS Network pharmacology analyses were conducted to screen out potential targets and pathways. The CIA rat model was established via an intraperitoneal injection of cisplatin. The histological changes of gastric antrum, liver and ileum were observed by HE staining. The serum levels of leptin, ghrelin, IL-6 and growth differentiation factor 15 (GDF15) were measured by ELISA. The JAK1/2 and STAT levels in gastric antrum and hypothalamus were detected by Western blot. The transcriptions of gastric antrum and hypothalamus IL-6R mRNA, and hypothalamus cocaine- and amphetamine-regulated transcript (CART), pro-opiomelanocortin (POMC), thyrotropin-releasing hormone (TRH), upregulated orexigenic peptides neuropeptide Y (NPY), and agouti-related protein (AGRP) mRNA were assessed by RT-qPCR. The blood samples of control, model and high dose LJZD groups were analyzed by metabolomic. RESULTS Network pharmacology highlighted the IL-6/leptin mediated JAK-STAT signaling pathway, which regulated downstream anorexigenic and orexigenic peptides in hypothalamus. LJZD ameliorated CIA via stimulating food intake and water consumption in rats. Cisplatin-induced gastric antrum, liver, ileum injuries were ameliorated, serum leptin level reduction was elevated, and ghrelin, IL-6, GDF15 level increases were decreased after LJZD treatments. In gastric antrum and hypothalamus, LJZD inhibited cisplatin-induced activation of JAK-STAT signaling pathway, downregulated the transcriptions of downstream anorexigenic peptides CART, POMC, TRH, and upregulated orexigenic peptides NPY, AGRP in hypothalamus. Importantly, the effect of LJZD in treating CIA might partly relate to the improvements of 23 abnormal metabolites. CONCLUSION This study implies that inhibiting JAK-STAT signaling pathway, regulating the expressions of anorexigenic and orexigenic peptides, and mediating various metabolic pathways might be potential mechanisms of LJZD's effect against CIA.
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Affiliation(s)
- Yongzhao Dai
- School of Chinese Materia Medica, Guangdong Pharmaceutical University, Guangzhou, 510006, PR China.
| | - Siqi Chen
- School of Chinese Materia Medica, Guangdong Pharmaceutical University, Guangzhou, 510006, PR China.
| | - Yaqi Li
- School of Chinese Materia Medica, Guangdong Pharmaceutical University, Guangzhou, 510006, PR China.
| | - Guanglong Zhang
- School of Chinese Materia Medica, Guangdong Pharmaceutical University, Guangzhou, 510006, PR China.
| | - Pingping Bi
- School of Chinese Materia Medica, Guangdong Pharmaceutical University, Guangzhou, 510006, PR China.
| | - Ke Nie
- School of Chinese Materia Medica, Guangdong Pharmaceutical University, Guangzhou, 510006, PR China.
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Zheng YL, Wang WD, Li MM, Lin S, Lin HL. Updated Role of Neuropeptide Y in Nicotine-Induced Endothelial Dysfunction and Atherosclerosis. Front Cardiovasc Med 2021; 8:630968. [PMID: 33708805 PMCID: PMC7940677 DOI: 10.3389/fcvm.2021.630968] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 02/03/2021] [Indexed: 12/18/2022] Open
Abstract
Cardiovascular disease is the leading cause of death worldwide. Endothelial dysfunction of the arterial vasculature plays a pivotal role in cardiovascular pathogenesis. Nicotine-induced endothelial dysfunction substantially contributes to the development of arteriosclerotic cardiovascular disease. Nicotine promotes oxidative inflammation, thrombosis, pathological angiogenesis, and vasoconstriction, and induces insulin resistance. However, the exact mechanism through which nicotine induces endothelial dysfunction remains unclear. Neuropeptide Y (NPY) is widely distributed in the central nervous system and peripheral tissues, and it participates in the pathogenesis of atherosclerosis by regulating vasoconstriction, energy metabolism, local plaque inflammatory response, activation and aggregation of platelets, and stress and anxiety-related emotion. Nicotine can increase the expression of NPY, suggesting that NPY is involved in nicotine-induced endothelial dysfunction. Herein, we present an updated review of the possible mechanisms of nicotine-induced atherosclerosis, with a focus on endothelial cell dysfunction associated with nicotine and NPY.
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Affiliation(s)
- Yan-Li Zheng
- Department of Cardiology, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, China
| | - Wan-da Wang
- Department of Cardiology, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, China
| | - Mei-Mei Li
- Department of Cardiology, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, China
| | - Shu Lin
- Department of Cardiology, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, China.,Centre of Neurological and Metabolic Research, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, China.,Diabetes and Metabolism Division, Garvan Institute of Medical Research, Sydney, NSW, Australia
| | - Hui-Li Lin
- Department of Cardiology, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, China
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Hanada R. The role of the RANKL/RANK/OPG system in the central nervous systems (CNS). J Bone Miner Metab 2021; 39:64-70. [PMID: 32888064 DOI: 10.1007/s00774-020-01143-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 08/11/2020] [Indexed: 12/18/2022]
Abstract
The receptor-activator of NF-κB ligand (RANKL) and its specific receptor RANK have essential roles in regulating bone metabolism and the immune system. Besides, the RANKL/RANK system plays important roles in multiple physiological and pathophysiological processes such as mammary gland development during pregnancy, cancer development, and bone metastasis. While it has long been known that RANKL and RANK are expressed in the central nervous system (CNS), the physiological roles of RANKL/RANK system in the CNS and the underlying molecular mechanisms have been elucidated recently. Over the last decade, several reports showed that the central RANKL/RANK system plays important roles in regulating body temperature, brain ischemia, autoimmune encephalopathy, feeding behavior, and energy metabolism. In this review, it is provided an updated information regarding the roles of RANKL/RANK system in the CNS.
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Affiliation(s)
- Reiko Hanada
- Department of Neurophysiology, Faculty of Medicine, Oita University, Idaigaoka 1-1, Yufu City, Oita, 879-5593, Japan.
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7
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Glasnović A, O'Mara N, Kovačić N, Grčević D, Gajović S. RANK/RANKL/OPG Signaling in the Brain: A Systematic Review of the Literature. Front Neurol 2020; 11:590480. [PMID: 33329338 PMCID: PMC7710989 DOI: 10.3389/fneur.2020.590480] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Accepted: 10/22/2020] [Indexed: 12/16/2022] Open
Abstract
Together with its dominant immunological and bone remodeling involvement, RRO axis, comprising of receptor activator of nuclear factor-κB (RANK), RANK ligand (RANKL), and osteoprotegerin (OPG) signaling, is as well-implicated in CNS functioning and corresponding pathologies. The CNS aspects of RANKL/RANK/OPG (RRO) axis were systematically reviewed. With search 10 databases, and 7 additional resources from first article publication to July 2019, resulted in total 2,222 hits, from which 33 relevant articles were selected. The elements of RRO axis in CNS include cells involved in neuroinflammation, predominantly in microglia, but as well in resident macrophages and inflammatory cells migrating across the blood-brain barrier. The expression in neurons and oligodendrocytes is mainly confined to processes of differentiation and cell death. RRO axis tunes the neuroinflammatory response, depending on the molecular, cellular and pathological context. RANK/RANKL signaling is neuroprotective in TLR-mediated inflammation, while OPG seems detrimental in stroke, but beneficial in multiple sclerosis. The levels of RRO axis elements can serve as biomarkers in the blood and cerebrospinal fluid. They act as neuroprotectant after brain damage even being implicated in body weight- and thermo-regulation. As derivatives of RRO axis already exist as therapeutic agents in bone remodeling, it would be intriquing to see if these or new RRO-based pharmaceuticals would appear effective in CNS therapies.
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Affiliation(s)
- Anton Glasnović
- Department of Histology and Embryology, Zagreb University School of Medicine, Zagreb, Croatia.,Croatian Institute for Brain Research, Zagreb University School of Medicine, Zagreb, Croatia
| | - Niall O'Mara
- Department of Medicine, Cork University Hospital, Cork, Ireland
| | - Nataša Kovačić
- Croatian Institute for Brain Research, Zagreb University School of Medicine, Zagreb, Croatia.,Department of Anatomy, Zagreb University School of Medicine, Zagreb, Croatia
| | - Danka Grčević
- Croatian Institute for Brain Research, Zagreb University School of Medicine, Zagreb, Croatia.,Department of Physiology and Immunology, Zagreb University School of Medicine, Zagreb, Croatia
| | - Srećko Gajović
- Department of Histology and Embryology, Zagreb University School of Medicine, Zagreb, Croatia.,Croatian Institute for Brain Research, Zagreb University School of Medicine, Zagreb, Croatia
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8
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Crosstalk of Brain and Bone-Clinical Observations and Their Molecular Bases. Int J Mol Sci 2020; 21:ijms21144946. [PMID: 32668736 PMCID: PMC7404044 DOI: 10.3390/ijms21144946] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 07/06/2020] [Accepted: 07/06/2020] [Indexed: 02/06/2023] Open
Abstract
As brain and bone disorders represent major health issues worldwide, substantial clinical investigations demonstrated a bidirectional crosstalk on several levels, mechanistically linking both apparently unrelated organs. While multiple stress, mood and neurodegenerative brain disorders are associated with osteoporosis, rare genetic skeletal diseases display impaired brain development and function. Along with brain and bone pathologies, particularly trauma events highlight the strong interaction of both organs. This review summarizes clinical and experimental observations reported for the crosstalk of brain and bone, followed by a detailed overview of their molecular bases. While brain-derived molecules affecting bone include central regulators, transmitters of the sympathetic, parasympathetic and sensory nervous system, bone-derived mediators altering brain function are released from bone cells and the bone marrow. Although the main pathways of the brain-bone crosstalk remain ‘efferent’, signaling from brain to bone, this review emphasizes the emergence of bone as a crucial ‘afferent’ regulator of cerebral development, function and pathophysiology. Therefore, unraveling the physiological and pathological bases of brain-bone interactions revealed promising pharmacologic targets and novel treatment strategies promoting concurrent brain and bone recovery.
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9
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Kalkan R, Becer E. RANK/RANKL/OPG pathway is an important for the epigenetic regulation of obesity. Mol Biol Rep 2019; 46:5425-5432. [PMID: 31364017 DOI: 10.1007/s11033-019-04997-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2019] [Accepted: 07/17/2019] [Indexed: 12/19/2022]
Abstract
Obesity is a complex disorder that is influenced by genetic and environmental factors. DNA methylation is an epigenetic mechanism that is involved in development of obesity and its metabolic complications. The aim of this study was to investigate the association between the RANKL and c-Fos gene methylation on obesity with body mass index (BMI), lipid parameters, homeostasis model assessment of insulin resistance (HOMA-IR), plasma leptin, adiponectin and resistin levels. The study included 68 obese and 46 non-obese subjects. Anthropometric parameters, including body weight, body mass index, waist circumference, and waist-hip ratio, were assessed. Serum glucose, triglycerides (TG), total cholesterol, high-density lipoprotein cholesterol (HDL-C), and low-density lipoprotein cholesterol (LDL-C), plasma leptin, adiponectin and resistin levels were measured. Methylation status of RANKL and c-Fos gen were evaluated by MS-HRM. Statistically significant differences were observed between obese patients and the controls with respect to RANKL and c-Fos gene methylation status (p < 0.001). Also, statistically significant importance was observed RANKL gene methylation and increased level of leptin in obese subjects (p = 0.0081). At the same time, statistically significant association between methylation of c-Fos and increased level of adiponectin was observed in obese patients (p = 0.03) On the other hand, decreased level of resistin was observed where the c-Fos was unmetyladed in controls (p = 0.01). We conclude that methylation of RANKL and c-Fos genes have significant influences on obesity and adipokine levels. Based on literature this was the first study which shows the interactions between RANKL and c-Fos methylation and obesity.
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Affiliation(s)
- Rasime Kalkan
- Department of Medical Genetics, Faculty of Medicine, Near East University, Nicosia, Cyprus
| | - Eda Becer
- Department of Biochemistry, Faculty of Pharmacy, Near East University, Near East Boulevard, ZIP. 99138, Nicosia, Cyprus. .,Research Center of Experimental Health Sciences (DESAM), Near East University, Nicosia, Cyprus.
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10
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Nakhate KT, Subhedar NK, Kokare DM. Involvement of neuropeptide CART in the central effects of insulin on feeding and body weight. Pharmacol Biochem Behav 2019; 181:101-109. [PMID: 31054945 DOI: 10.1016/j.pbb.2019.05.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Revised: 04/23/2019] [Accepted: 05/01/2019] [Indexed: 12/15/2022]
Abstract
While insulin secreted from pancreas plays a pivotal role in the control of glucose homeostasis, it also interacts with hypothalamic sites and negatively influences the energy balance. The present study was undertaken to reveal the functional interaction between cocaine- and amphetamine-regulated transcript (CART), a well-known anorexic peptide, and insulin within the framework of hypothalamus in the regulation of feeding behavior and body weight. Insulin was administered daily by intracerebroventricular (icv) route, alone or in combination with CART (icv) for a period of seven days. Immediately thereafter, preweighed food was offered to the animals at the commencement of the dark phase. The food intake and body weight were measured daily just prior to next injection. Furthermore, brains of insulin-treated rats were processed for the immunohistochemical analysis of CART-containing elements in the hypothalamus. Treatment with insulin (6 mU, icv) for a period of 7 days caused a significant decrease in food intake and body weight as compared to control. Concomitant administration of CART (0.5 μg, icv) potentiated insulin-induced anorexia and weight loss. Insulin administration resulted in a significant increase in CART immunoreactivity in the hypothalamic arcuate, paraventricular, dorsomedial and ventromedial nuclei. We suggest that increased CART contents in the hypothalamus may be causally linked with anorexia and weight loss induced by insulin.
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Affiliation(s)
- Kartik T Nakhate
- Rungta College of Pharmaceutical Sciences and Research, Rungta Educational Campus, Kohka-Kurud Road, Bhilai 490 024, Chhattisgarh, India
| | - Nishikant K Subhedar
- Indian Institute of Science Education and Research (IISER), Dr. Homi Bhabha Road, Near NCL, Pune 411 021, Maharashtra, India
| | - Dadasaheb M Kokare
- Department of Pharmaceutical Sciences, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur 440 033, Maharashtra, India.
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11
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Papathanasiou AE, Nolen-Doerr E, Farr OM, Mantzoros CS. GEOFFREY HARRIS PRIZE LECTURE 2018: Novel pathways regulating neuroendocrine function, energy homeostasis and metabolism in humans. Eur J Endocrinol 2019; 180:R59-R71. [PMID: 30475221 PMCID: PMC6378110 DOI: 10.1530/eje-18-0847] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 11/05/2018] [Indexed: 12/12/2022]
Abstract
The discovery of leptin, an adipocyte-secreted hormone, set the stage for unraveling the mechanisms dictating energy homeostasis, revealing adipose tissue as an endocrine system that regulates appetite and body weight. Fluctuating leptin levels provide molecular signals to the brain regarding available energy reserves modulating energy homeostasis and neuroendocrine response in states of leptin deficiency and to a lesser extent in hyperleptinemic states. While leptin replacement therapy fails to provide substantial benefit in common obesity, it is an effective treatment for congenital leptin deficiency and states of acquired leptin deficiency such as lipodystrophy. Current evidence suggests that regulation of eating behavior in humans is not limited to homeostatic mechanisms and that the reward, attention, memory and emotion systems are involved, participating in a complex central nervous system network. It is critical to study these systems for the treatment of typical obesity. Although progress has been made, further studies are required to unravel the physiology, pathophysiology and neurobehavioral mechanisms underlying potential treatments for weight-related problems in humans.
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Affiliation(s)
| | - Eric Nolen-Doerr
- Division of Endocrinology, Beth Israel Deaconess Medical Center/Harvard Medical School, Boston, MA 02215
| | - Olivia M. Farr
- Division of Endocrinology, Beth Israel Deaconess Medical Center/Harvard Medical School, Boston, MA 02215
| | - Christos S. Mantzoros
- Division of Endocrinology, Beth Israel Deaconess Medical Center/Harvard Medical School, Boston, MA 02215
- Address correspondence to: Christos Mantzoros, MD, DSc, PhD h.c. mult., Beth Israel Deaconess Medical Center, 330 Brookline Ave, ST820, Boston, MA 02215, Phone: 617-667-1510,
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