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Fang P, He B, Shi M, Kong G, Dong X, Zhu Y, Bo P, Zhang Z. The regulative effect of galanin family members on link of energy metabolism and reproduction. Peptides 2015; 71:240-9. [PMID: 26188174 DOI: 10.1016/j.peptides.2015.07.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2015] [Revised: 06/27/2015] [Accepted: 07/03/2015] [Indexed: 12/22/2022]
Abstract
It is essential for the species survival that an efficient coordination between energy storage and reproduction through endocrine regulation. The neuropeptide galanin, one of the endocrine hormones, can potently coordinate energy metabolism and the activities of hypothalamic-pituitary-gonadal reproductive axis to adjust synthesis and release of metabolic and reproductive hormones in animals and humans. However, few papers have summarized the regulative effect of the galanin family members on the link of energy storage and reproduction as yet. To address this issue, this review attempts to summarize the current information available about the regulative effect of galanin, galanin-like peptide and alarin on the metabolic and reproductive events, with special emphasis on the interactions between galanin and hypothalamic gonadotropin-releasing hormone, pituitary luteinizing hormone and ovarian hormones. This research line will further deepen our understanding of the physiological roles of the galanin family in regulating the link of energy metabolism and reproduction.
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Affiliation(s)
- Penghua Fang
- Department of Physiology, Nanjing University of Chinese Medicine Hanlin College, Taizhou 225300, China; Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou University, Yangzhou 225001, China
| | - Biao He
- Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou University, Yangzhou 225001, China
| | - Mingyi Shi
- Department of Endocrinology, Clinical Medical College, Yangzhou University, Yangzhou 225001, China; Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou University, Yangzhou 225001, China
| | - Guimei Kong
- Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou University, Yangzhou 225001, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, China
| | - Xiaoyun Dong
- Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou University, Yangzhou 225001, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, China
| | - Yan Zhu
- Department of Endocrinology, Clinical Medical College, Yangzhou University, Yangzhou 225001, China
| | - Ping Bo
- Department of Endocrinology, Clinical Medical College, Yangzhou University, Yangzhou 225001, China; Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou University, Yangzhou 225001, China.
| | - Zhenwen Zhang
- Department of Endocrinology, Clinical Medical College, Yangzhou University, Yangzhou 225001, China; Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou University, Yangzhou 225001, China.
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Yamamoto H, Arai T, Ben S, Iguchi K, Hoshino M. Expression of galanin and galanin receptor mRNA in skin during the formation of granulation tissue. Endocrine 2011; 40:400-7. [PMID: 21894515 DOI: 10.1007/s12020-011-9529-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2011] [Accepted: 08/19/2011] [Indexed: 10/17/2022]
Abstract
Galanin is a neuropeptide widely distributed in the central and peripheral nervous systems. Although its role in non-neural cells is poorly understood, it is known that during inflammation, the dermis layer of the skin produces and releases galanin. The aim of this report is to study the expression of galanin in granulation tissue. After inducing inflammation by cotton thread implantation, galanin-like immunoreactivity (galanin-LI) in plasma reached a maximum on the third day. Galanin-LI was observed in fibroblast-like cells occurring close to collagen fibers in developing granulation tissue. Furthermore, galanin receptor subtypes 1 and 2 (GALR1 and GALR2)-expressing cells were observed around microvessels and were found to produce desmin. Galanin was injected along the cotton threads immediately after implantation, resulting in rapid formation of granulation tissue, and an increase in the contents of microvessels, indicating a stimulatory effect of galanin on the process of angiogenesis in granulation tissue. The results demonstrate that some galanin was released from fibroblast-like cells during the formation of granulation tissue, and that it stimulated angiogenesis.
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Affiliation(s)
- Hiroyuki Yamamoto
- Laboratory of Bioorganic Chemistry, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan.
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Sun YG, Gu XL, Yu LC. The neural pathway of galanin in the hypothalamic arcuate nucleus of rats: activation of beta-endorphinergic neurons projecting to periaqueductal gray matter. J Neurosci Res 2007; 85:2400-6. [PMID: 17600376 DOI: 10.1002/jnr.21396] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We have previously shown that microinjection of galanin into the arcuate nucleus of hypothalamus (ARC) produced antinociceptive effects in rats (Sun et al., 2003a). In this study, the neural pathway of galanin from ARC to midbrain periaqueductal gray (PAG) in nociceptive modulation was investigated. The hindpaw withdrawal latencies (HWLs) with noxious thermal and mechanical stimulation were assessed by the hotplate and the Randall Selitto tests. Intra-ARC administration of 0.1, 0.5, or 1 nmol of galanin induced significant increases in HWLs of rats. The galanin-induced increases in HWLs were inhibited by injection of 10 microg of the opioid receptor antagonist naloxone or 1 nmol of the mu-opioid receptor antagonist beta-funaltrexamine (beta-FNA) into PAG, suggesting that the antinociceptive effects induced by intra-ARC injection of galanin occur via the neural pathway from ARC to PAG. Furthermore, our results demonstrate that the galaninergic fibers directly innervated the beta-endorphinergic neurons in ARC by immunofluorescent methods. Taken together, our results suggest that galanin produces antinociceptive effects in the ARC of rats by activating the beta-endorphinergic pathway from ARC to PAG.
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Affiliation(s)
- Yan-Gang Sun
- Neurobiology Laboratory and National Laboratory of Biomembrane and Membrane Biotechnology, College of Life Sciences, Peking University, Beijing, People's Republic of China
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d'Anglemont de Tassigny X, Campagne C, Dehouck B, Leroy D, Holstein GR, Beauvillain JC, Buée-Scherrer V, Prevot V. Coupling of neuronal nitric oxide synthase to NMDA receptors via postsynaptic density-95 depends on estrogen and contributes to the central control of adult female reproduction. J Neurosci 2007; 27:6103-14. [PMID: 17553983 PMCID: PMC6672152 DOI: 10.1523/jneurosci.5595-06.2007] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Considerable research has been devoted to the understanding of how nitric oxide (NO) influences brain function. Few studies, however, have addressed how its production is physiologically regulated. Here, we report that protein-protein interactions between neuronal NO synthase (nNOS) and glutamate NMDA receptors via the scaffolding protein postsynaptic density-95 (PSD-95) in the hypothalamic preoptic region of adult female rats is sensitive to cyclic estrogen fluctuation. Coimmunoprecipitation experiments were used to assess the physical association between nNOS and NMDA receptor NR2B subunit in the preoptic region of the hypothalamus. We found that nNOS strongly interacts with NR2B at the onset of the preovulatory surge at proestrus (when estrogen levels are highest) compared with basal-stage diestrous rats. Consistently, estrogen treatment of gonadectomized female rats also increases nNOS/NR2B complex formation. Moreover, endogenous fluctuations in estrogen levels during the estrous cycle coincide with changes in the physical association of nNOS to PSD-95 and the magnitude of NO release in the preoptic region. Finally, temporary and local in vivo suppression of PSD-95 synthesis by using antisense oligodeoxynucleotides leads to inhibition of nNOS activity in the preoptic region and disrupted estrous cyclicity, a process requiring coordinated activation of neurons containing gonadotropin-releasing hormone (the neuropeptide controlling reproductive function). In conclusion, our findings identify a novel steroid-mediated molecular mechanism that enables the adult mammalian brain to control NO release under physiological conditions.
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Affiliation(s)
- Xavier d'Anglemont de Tassigny
- Inserm, Jean-Pierre Aubert Research Centre, U837, Development and Plasticity of the Postnatal Brain, 59045 Lille cedex, France
- University of Lille 2, School of Medicine, Institut de Médecine Prédictive et de Recherche Thérapeutique, 59046 Lille cedex, France, and
| | - Céline Campagne
- Inserm, Jean-Pierre Aubert Research Centre, U837, Development and Plasticity of the Postnatal Brain, 59045 Lille cedex, France
- University of Lille 2, School of Medicine, Institut de Médecine Prédictive et de Recherche Thérapeutique, 59046 Lille cedex, France, and
| | - Bénédicte Dehouck
- Inserm, Jean-Pierre Aubert Research Centre, U837, Development and Plasticity of the Postnatal Brain, 59045 Lille cedex, France
- University of Lille 2, School of Medicine, Institut de Médecine Prédictive et de Recherche Thérapeutique, 59046 Lille cedex, France, and
| | - Danièle Leroy
- Inserm, Jean-Pierre Aubert Research Centre, U837, Development and Plasticity of the Postnatal Brain, 59045 Lille cedex, France
- University of Lille 2, School of Medicine, Institut de Médecine Prédictive et de Recherche Thérapeutique, 59046 Lille cedex, France, and
| | - Gay R. Holstein
- Department of Neurology, Mount Sinai School of Medicine, New York, New York 10029
| | - Jean-Claude Beauvillain
- Inserm, Jean-Pierre Aubert Research Centre, U837, Development and Plasticity of the Postnatal Brain, 59045 Lille cedex, France
- University of Lille 2, School of Medicine, Institut de Médecine Prédictive et de Recherche Thérapeutique, 59046 Lille cedex, France, and
| | - Valérie Buée-Scherrer
- Inserm, Jean-Pierre Aubert Research Centre, U837, Development and Plasticity of the Postnatal Brain, 59045 Lille cedex, France
- University of Lille 2, School of Medicine, Institut de Médecine Prédictive et de Recherche Thérapeutique, 59046 Lille cedex, France, and
| | - Vincent Prevot
- Inserm, Jean-Pierre Aubert Research Centre, U837, Development and Plasticity of the Postnatal Brain, 59045 Lille cedex, France
- University of Lille 2, School of Medicine, Institut de Médecine Prédictive et de Recherche Thérapeutique, 59046 Lille cedex, France, and
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Hui R, Chen T, Li YQ. The reciprocal connections of endomorphin 1- and endomorphin 2-containing neurons between the hypothalamus and nucleus tractus solitarii in the rat. Neuroscience 2005; 138:171-81. [PMID: 16360287 DOI: 10.1016/j.neuroscience.2005.10.039] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2005] [Revised: 10/23/2005] [Accepted: 10/25/2005] [Indexed: 01/25/2023]
Abstract
In the CNS, endomorphin 1- and endomorphin 2-immunoreactive neuronal cell bodies have been principally found both in the hypothalamus and nucleus tractus solitarii. Functionally, the hypothalamus and nucleus tractus solitarii are closely related in many aspects, especially in visceral functions. On the other hand, there are also many endomorphin-immunoreactive fibers and terminals in the two regions. In the present study, to investigate whether endomorphin 1-immunoreactive and endomorphin 2-immunoreactive neurons in the hypothalamus and nucleus tractus solitarii project reciprocally between these two regions, fluorescent retrograde labeling combined with immunofluorescence histochemical staining for endomorphin 1 and endomorphin 2 was used. After injection of Fluoro-Gold into the nucleus tractus solitarii of rats, endomorphin 1/Fluoro-Gold or endomorphin 2/Fluoro-Gold double-labeled neuronal cell bodies were predominantly observed in the arcuate nucleus of the hypothalamus, a few of which were also observed in the posterior hypothalamic area and periventricular hypothalamic nucleus. After injection of Fluoro-Gold into the medial zone of hypothalamic tuberal region and the lateral hypothalamic area, respectively, endomorphin 1/Fluoro-Gold or endomorphin 2/Fluoro-Gold double-labeled neuronal cell bodies were found chiefly in the medial, commissural, lateral and gelatinous parts of the nucleus tractus solitarii. These results provide morphological evidence that there exist reciprocal endomorphinergic connections between the hypothalamus and nucleus tractus solitarii.
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Affiliation(s)
- R Hui
- Department of Anatomy and K. K. Leung Brain Research Centre, The Fourth Military Medical University, Xi'an 710032, PR China
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Leibowitz SF. Regulation and effects of hypothalamic galanin: relation to dietary fat, alcohol ingestion, circulating lipids and energy homeostasis. Neuropeptides 2005; 39:327-32. [PMID: 15944030 DOI: 10.1016/j.npep.2004.12.022] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2004] [Accepted: 12/07/2004] [Indexed: 10/25/2022]
Abstract
Galanin (GAL) is known to stimulate feeding behavior. This peptide has different properties and functions from other feeding stimulants, e.g., neuropeptide Y and agouti-related protein. Hypothalamic GAL is relatively unresponsive to food deprivation and to changes in corticosterone, glucose utilization, dietary carbohydrate and leptin. This indicates that this peptide is not essential under conditions when food is scarce or low-energy, high-carbohydrate diets are being consumed. In contrast, recent evidence suggests that GAL in the paraventricular nucleus (PVN) functions in close relation to dietary fat and alcohol. In particular, it mediates functions that allow animals to adapt to conditions of positive energy balance involving excess consumption of these nutrients. This peptide in the PVN is stimulated by a high-fat diet and also by alcohol. It is stimulated by an increase in circulating lipids caused by a fat-rich meal or alcohol consumption, and it rises during the middle of the active feeding cycle, when fat consumption and triglycerides naturally rise. When centrally injected, GAL in the PVN increases the consumption of food and alcohol. Moreover, it produces a significantly stronger feeding response in rats maintained on a fat-rich diet, which also promotes alcohol intake. This evidence supports the existence of non-homeostatic, positive feedback circuits between GAL and both dietary fat and alcohol. These circuits are believed to contribute to the large meal size, over-consumption of alcohol, and obesity which are generally associated with fat-rich foods.
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Affiliation(s)
- Sarah F Leibowitz
- Department of Neuropharmacology, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.
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Sun YG, Yu LC. Interactions of galanin and opioids in nociceptive modulation in the arcuate nucleus of hypothalamus in rats. ACTA ACUST UNITED AC 2005; 124:37-43. [PMID: 15544839 DOI: 10.1016/j.regpep.2004.06.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2004] [Accepted: 06/22/2004] [Indexed: 11/21/2022]
Abstract
The fact that galanin, beta-endorphin and their receptors are present in the arcuate nucleus of hypothalamus (ARC), coupled with our previous observation that both beta-endorphin and galanin play antinociceptive roles in pain modulation in the ARC, made it of interest to study their interactions. The hindpaw withdrawal latency (HWL) in response to noxious thermal and mechanical stimulation was assessed by the hot-plate test and the Randall Selitto Test. We showed that the antinociceptive effect induced by intra-ARC injection of galanin was dose-dependently attenuated by the following intra-ARC injection of naloxone. Furthermore, intra-ARC administration of the selective mu-opioid receptor antagonist beta-funaltrexamine (beta-FNA) attenuated the increased HWL induced by intra-ARC injection of galanin in a dose-dependent manner, while the delta-opioid receptor antagonist naltrindole or the kappa-opioid receptor antagonist nor-binaltorphimine (nor-BNI) did not. Moreover, intra-ARC injection of a galanin receptor antagonist galantide attenuated intraperitoneal morphine-induced increases in HWLs. These results demonstrate that the antinociceptive effect of galanin was related to the opioid system, especially mu-opioid receptor was involved in, and that systemic morphine induced antinociception involves galanin in the ARC.
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Affiliation(s)
- Yan-Gang Sun
- Department of Physiology, College of Life Sciences, National Laboratory of Biomembrane and Membrane Biotechnology, Center for Brain and Cognitive Science, Peking University, Beijing 100871, People's Republic of China
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Imbe H, Abe T, Okamoto K, Sato M, Ito H, Kumabe S, Senba E. Increase of galanin-like immunoreactivity in rat hypothalamic arcuate neurons after peripheral nerve injury. Neurosci Lett 2004; 368:102-6. [PMID: 15342143 DOI: 10.1016/j.neulet.2004.06.073] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2004] [Revised: 06/23/2004] [Accepted: 06/23/2004] [Indexed: 10/26/2022]
Abstract
Galanin and galanin receptors are widely distributed within the central nervous system, and may play important roles in pain signaling and modulation. In the present study, we examined the galanin immunoreactivity (IR) in the hypothalamus and the amygdala following peripheral nerve injury. Four weeks after the operation, the ipsilateral mechanical threshold in the spared nerve injury (SNI) group (0.87 +/- 0.33 g) was significantly lower than that in the sham group (12.53 +/- 3.41 g; P < 0.05). In the SNI group, the number of galanin-IR neurons per section in the arcuate nucleus (Arc) of the hypothalamus was 10.2 +/- 1.7, significantly higher than that in the sham group (5.6 +/- 1.0; P < 0.05). These data suggest that the galanin-ergic neurons in the Arc may be involved in the functional modulation of descending pain modulation system following peripheral nerve injury.
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Affiliation(s)
- Hiroki Imbe
- Department of Anatomy and Neurobiology, Wakayama Medical University, Kimiidera 811-1, Wakayama City 641-8509, Japan.
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Abstract
Energy balance is maintained via a homeostatic system involving both the brain and the periphery. A key component of this system is the hypothalamus. Over the past two decades, major advances have been made in identifying an increasing number of peptides within the hypothalamus that contribute to the process of energy homeostasis. Under stable conditions, equilibrium exists between anabolic peptides that stimulate feeding behavior, as well as decrease energy expenditure and lipid utilization in favor of fat storage, and catabolic peptides that attenuate food intake, while stimulating sympathetic nervous system (SNS) activity and restricting fat deposition by increasing lipid metabolism. The equilibrium between these neuropeptides is dynamic in nature. It shifts across the day-night cycle and from day to day and also in response to dietary challenges as well as peripheral energy stores. These shifts occur in close relation to circulating levels of the hormones, leptin, insulin, ghrelin and corticosterone, and also the nutrients, glucose and lipids. These circulating factors together with neural processes are primary signals relaying information regarding the availability of fuels needed for current cellular demand, in addition to the level of stored fuels needed for long-term use. Together, these signals have profound impact on the expression and production of neuropeptides that, in turn, initiate the appropriate anabolic or catabolic responses for restoring equilibrium. In this review, we summarize the evidence obtained on nine peptides in the hypothalamus that have emerged as key players in this process. Data from behavioral, physiological, pharmacological and genetic studies are described and consolidated in an attempt to formulate a clear statement on the underlying function of each of these peptides and also on how they work together to create and maintain energy homeostasis.
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Affiliation(s)
- Sarah F Leibowitz
- Laboratory of Behavioral Neurobiology, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.
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Sun YG, Gu XL, Lundeberg T, Yu LC. An antinociceptive role of galanin in the arcuate nucleus of hypothalamus in intact rats and rats with inflammation. Pain 2003; 106:143-50. [PMID: 14581121 DOI: 10.1016/s0304-3959(03)00316-6] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the arcuate nucleus of hypothalamus (ARC), galaninergic fibers form synaptic contacts with proopiomelanocortin neurons, which are involved in pain modulation. The present study assessed the role of exogenous and endogenous galanin in the modulation of nociception in the ARC of rats. The hindpaw withdrawal latency (HWL) to thermal and mechanical stimulation was assessed by the hot-plate test and the Randall Selitto Test. Intra-ARC injection of galanin dose-dependently increased the HWLs in intact rats, indicating an antinociceptive role of exogenous galanin in the ARC. The antinociceptive effect of galanin was blocked by following intra-ARC injection of galantide, a putative galanin receptor antagonist, suggesting that the antinociceptive effect of galanin is mediated by galanin receptors. Moreover, intra-ARC injection of galanin increased the HWL in rats with inflammation. Intra-ARC administration of galantide alone reduced the HWLs in rats with inflammation, while there were no influences of galantide on the HWL in intact rats. Taken together, the results show that galanin has an antinociceptive role in the ARC of intact rats and rats with inflammation.
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Affiliation(s)
- Yan-Gang Sun
- Neurobiology Laboratory, College of Life Sciences, National Laboratory of Biomembrane and Membrane Biotechnology and Center for Brain and Cognitive Science, Peking University, Beijing 100871, China
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Abstract
This paper is the twenty-fifth consecutive installment of the annual review of research concerning the endogenous opioid system, now spanning over a quarter-century of research. It summarizes papers published during 2002 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular topics that continue to be covered include the molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors related to behavior (Section 2), and the roles of these opioid peptides and receptors in pain and analgesia (Section 3); stress and social status (Section 4); tolerance and dependence (Section 5); learning and memory (Section 6); eating and drinking (Section 7); alcohol and drugs of abuse (Section 8); sexual activity and hormones, pregnancy, development and endocrinology (Section 9); mental illness and mood (Section 10); seizures and neurologic disorders (Section 11); electrical-related activity and neurophysiology (Section 12); general activity and locomotion (Section 13); gastrointestinal, renal and hepatic functions (Section 14); cardiovascular responses (Section 15); respiration and thermoregulation (Section 16); and immunological responses (Section 17).
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, CUNY, 65-30 Kissena Blvd., Flushing, NY 11367, USA.
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