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Watanabe K, Konno N, Nakamachi T, Matsuda K. Intraperitoneal administration of α-melanocyte stimulating hormone (α-MSH) suppresses food intake and induces anxiety-like behavior via the brain MC4 receptor-signaling pathway in goldfish. J Neuroendocrinol 2024:e13435. [PMID: 39092865 DOI: 10.1111/jne.13435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2024] [Revised: 06/24/2024] [Accepted: 07/17/2024] [Indexed: 08/04/2024]
Abstract
α-Melanocyte stimulating hormone (α-MSH) is a peptide hormone released from the intermediate lobe of the pituitary which regulates body pigmentation. In addition to the pituitary, α-MSH is also produced in the midbrain, and exerts both anorexigenic and an anxiogenic actions. Acyl ghrelin and cholecystokinin are peripheral hormones derived from the digestive tract which affect the brain to control food intake and feeding behavior in vertebrates. In the present study, hypothesizing that plasma α-MSH may also stimulate the brain and exert central effects, we examined whether peripherally administered α-MSH affects food intake and psychomotor activity using a goldfish model. Intraperitoneal (IP) administration of α-MSH at 100 pmol g-1 body weight (BW) reduced food consumption and enhanced thigmotaxis. These α-MSH-induced actions were blocked by intracerebroventricular administration of HS024, an antagonist of the melanocortin 4 receptor (MC4R), at 50 pmol g-1 BW, whereas these actions were not attenuated by pretreatment with an IP-injected excess amount of capsaicin, a neurotoxin that destroys primary sensory (vagal and splanchnic) afferents, at 160 nmol g-1 BW. Transcripts for the MC4R showed higher expression in the diencephalon in other regions of the brain. These results suggest that, in goldfish, IP administered α-MSH is taken up by the brain, and also acts as anorexigenic and anxiogenic factor via the MC4R signaling pathway.
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Affiliation(s)
- Keisuke Watanabe
- Laboratory of Regulatory Biology, Graduate School of Innovative Life Sciences, University of Toyama, Toyama, Japan
| | - Norifumi Konno
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama, Japan
- Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama, Japan
| | - Tomoya Nakamachi
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama, Japan
- Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama, Japan
| | - Kouhei Matsuda
- Laboratory of Regulatory Biology, Graduate School of Innovative Life Sciences, University of Toyama, Toyama, Japan
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama, Japan
- Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama, Japan
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2
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Nagamine R, Konno N, Nakamachi T, Matsubara H, Matsuda K. Intraperitoneal administration of arginine vasotocin (AVT) induces anorexigenic and anxiogenic actions via the brain V1a receptor-signaling pathway in the tiger puffer, Takifugu rubripes. Peptides 2024; 178:171239. [PMID: 38723948 DOI: 10.1016/j.peptides.2024.171239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 04/15/2024] [Accepted: 05/01/2024] [Indexed: 05/16/2024]
Abstract
Arginine vasotocin (AVT) is produced mainly in the hypothalamus and as a neurohypophyseal hormone peripherally regulates water-mineral balance in sub-mammals. In addition, AVT-containing neurons innervate several areas of the brain, and AVT also acts centrally as both an anorexigenic and anxiogenic factor in goldfish. However, it is unclear whether these central effects operate in fish in general. In the present study, therefore, we investigated AVT-like immunoreactivity in the brain of the tiger puffer, a cultured fish with a high market value in Japan and also a representative marine teleost species, focusing particularly on whether AVT affects food intake and psychomotor activity. AVT-like immunoreactivity was distributed higher in the ventral region of the telencephalon, the hypothalamus and midbrain. Intraperitoneal (IP) administration of AVT at 100 pmol g-1 body weight (BW) increased the immunoreactivity of phosphorylated ribosomal proteinS6 (RPS6), a neuronal activation marker, in the telencephalon and diencephalon, decreased food consumption and enhanced thigmotaxis. AVT-induced anorexigenic and anxiogenic actions were blocked by IP co-injection of a V1a receptor (V1aR) antagonist, Manning compound (MC) at 300 pmol g-1 BW. These results suggest that AVT acts as an anorexigenic and anxiogenic factor via the V1aR-signaling pathway in the tiger puffer brain.
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Affiliation(s)
- Ryo Nagamine
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan
| | - Norifumi Konno
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan; Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama 930-8555, Japan
| | - Tomoya Nakamachi
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan; Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama 930-8555, Japan
| | - Hajime Matsubara
- Noto Center for Fisheries Science and Technology, Kanazawa University, Ossaka, Noto-cho, Ishikawa 927-0552, Japan
| | - Kouhei Matsuda
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan; Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama 930-8555, Japan.
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3
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Zhang S, Lu Y, Liu Y, Wang M, Xu S, Li Y, Wu H, Pei Q, Yang L, Lu L, Xiong Y, Liu Y, Chen S, Yao Q, Kang Q, Li Y, Chen D, Zhang X, Tang N, Li Z. Neglected function of gastrin to reduce feeding in Siberian sturgeon (Acipenser baerii) via cholecystokinin receptor B. FISH PHYSIOLOGY AND BIOCHEMISTRY 2024; 50:941-954. [PMID: 38381278 DOI: 10.1007/s10695-024-01308-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Accepted: 01/23/2024] [Indexed: 02/22/2024]
Abstract
Gastrin is an important intragastrointestinal hormone, but reports on its regulation of feeding behavior in fish are still scarce. This study aimed to determine the feeding regulatory function of gastrin in sturgeon. In this study, a gastrin/cholecystokinin-like peptide was identified in the genomes of sturgeon and proved to be gastrin by evolutionary tree analysis. Tissue distribution of gastrin and its receptor, cholecystokinin receptor B (CCKRB), showed that both had high mRNA abundance in the hypothalamus and gastrointestinal tract. In the duodenum, gastrin and CCKRB mRNAs were reduced at 1 h of fasting, and both were also observed in the stomach and hypothalamus in response to changes in feeding status. Sulfated gastrin 17 is the major form of gastrin in vivo. Therefore, we investigated the effect of sulfated gastrin 17 on feeding by intraperitoneal injection into Siberian sturgeon using sulfated gastrin 17. The results showed that gastrin 17 significantly reduced the cumulative feeding of Siberian sturgeon in the short term (1, 3 and 6 h) and long term (1, 2, 3, 4, 5 and 7 days). Finally, we explored the potential mechanism of feeding inhibition after intraperitoneal injection of gastrin 17 for 7 consecutive days. The results showed that gastrin 17 treatment significantly increased the mRNA levels of anorexigenic peptides (cart, cck and pyy), while it had no significant effect on the mRNA abundance of orexigenic peptides (npy and agrp). In addition, gastrin 17 treatment significantly affected the expression of appetite signaling pathways in the hypothalamus, such that the mRNA expression of ampkα1 was significantly reduced, whereas the mRNA abundance of stat3, mtor and s6k was significantly increased. In conclusion, the present study confirmed the anorectic effect of gastrin on Siberian sturgeon.
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Affiliation(s)
- Shupeng Zhang
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China.
| | - Yongpei Lu
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China
| | - Yanling Liu
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China
| | - Mei Wang
- Chengdu Agricultural College, 392# Detong Bridge, Chengdu, Sichuan, China
| | - Shaoqi Xu
- Sichuan Fisheries School, 18# Dujuan Road, Chengdu, Chengdu, Sichuan, China
| | - Ya Li
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China
| | - Hongwei Wu
- Chengdu Agricultural College, 392# Detong Bridge, Chengdu, Sichuan, China
| | - Qaolin Pei
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China
| | - Lei Yang
- Yuxi Agricultural Vocational-Technical College, 41# Xiangjiazhuang, Yuxi, Yunnan, China
| | - Lu Lu
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China
| | - Yixiao Xiong
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China
| | - Youlian Liu
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China
| | - Shuhuang Chen
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China
| | - Qin Yao
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China
| | - Qin Kang
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China
| | - Yingzi Li
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China
| | - Defang Chen
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China
| | - Xin Zhang
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China
| | - Ni Tang
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China.
| | - Zhiqiong Li
- Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 211# Huimin Road, Chengdu, Sichuan, China.
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Saiz N, Herrera-Castillo L, de Pedro N, Delgado MJ, Arvidsson SD, Marugal-López MÁ, Isorna E. Assessing Chronodisruption Distress in Goldfish: The Importance of Multimodal Approaches. Animals (Basel) 2023; 13:2481. [PMID: 37570290 PMCID: PMC10417125 DOI: 10.3390/ani13152481] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 07/26/2023] [Accepted: 07/28/2023] [Indexed: 08/13/2023] Open
Abstract
Chronodisruption caused by factors such as light at night and mistimed meals has been linked to numerous physiological alterations in vertebrates and may be an anxiogenic factor affecting welfare. This study aims to investigate whether chronodisruption causes measurable changes in the anxiety responses of goldfish under two conditions: randomly scheduled feeding (RF) and continuous light (LL). Anxiety-like behavior was assessed in the open field with object approach and black/white preference tests, which had been validated using diazepam. An increased thigmotaxis response and decreased object exploration under both chronodisruption protocols indicated anxiety states. Furthermore, locomotor activity was increased in LL fish. The black/white preference test discriminated anxiolysis induced by diazepam but was unable to detect anxiety caused by chronodisruption. Plasma cortisol increased in both RF and LL fish throughout the experiment, confirming that both conditions caused stress. The LL fish also showed an apparently desensitized hypothalamus-pituitary-interrenal HPI axis, with a decrease in pomc and crf expression. Individual analysis found no correlation between anxiety-like behavior and stress axis activation nor between scototaxis and thigmotaxis responses. However, individual differences in sensitivity to each test were detected. Altogether, these results highlight circadian disruption as a stressor for fish and endorse a multiple variable approach for reliably assessing animal discomfort.
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Affiliation(s)
| | | | | | | | | | | | - Esther Isorna
- Department of Genetics, Physiology and Microbiology, Faculty of Biological Sciences, Complutense University of Madrid, 28040 Madrid, Spain; (N.S.); (L.H.-C.); (N.d.P.); (M.J.D.); (S.D.A.); (M.Á.M.-L.)
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Shimizu K, Watanabe K, Konno N, Nakamachi T, Matsuda K. Comparative Observation and Analysis of Preference Behavior Based on Three Types of Taxes and Locomotor Activity in the Goldfish, Carassius auratus. Zoolog Sci 2023; 40:1-6. [PMID: 36744703 DOI: 10.2108/zs220059] [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: 07/14/2022] [Accepted: 11/17/2022] [Indexed: 01/17/2023]
Abstract
Psychophysiological studies in vertebrates have focused on taxes as indicators of behavioral change. Actually, a considerable number of studies about anxiety-like and anti-anxiety-like behaviors involving geotaxis, scototaxis, and thigmotaxis have been conducted on fish. However, few analyses considering these behaviors based on taxes in fish have been conducted. Here, using goldfish, we measured the time spent in the bright or dark area of a horizontally long rectangular tank (HLRT), in the upper or lower area of a vertically long rectangular tank (VLRT), and in the central or edge area of a circular tank (CT), respectively, for the first 30 min and the last 30 min in a 3-h period after fish had been introduced to tanks. Dark, lower, and edge preference behaviors were observed for the first 30 min in all tanks. While dark and edge preference behaviors were maintained even for the last 30 min, the lower preference was lost. Swimming distance and the number of area crossings in each tank were also compared between the first 30 min and the last 30 min. Both decreased significantly or tended to decrease in the last 30 min in the HLRT and the CT, but no change was observed in the VLRT. These results suggest that, in goldfish, preference behavior is stable for a short time, and that environmental habituation may depend on the shape of the tank and the elapsed time.
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Affiliation(s)
- Kyoka Shimizu
- Laboratory of Regulatory Biology, Department of Biology, Faculty of Science, University of Toyama, Toyama 930-8555, Japan
| | - Keisuke Watanabe
- Laboratory of Regulatory Biology, Graduate School of Innovative Life Sciences, University of Toyama, Toyama 930-8555, Japan
| | - Norifumi Konno
- Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama 930-8555, Japan
| | - Tomoya Nakamachi
- Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama 930-8555, Japan
| | - Kouhei Matsuda
- Laboratory of Regulatory Biology, Graduate School of Innovative Life Sciences, University of Toyama, Toyama 930-8555, Japan, .,Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama 930-8555, Japan
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6
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Matsuda K, Watanabe K, Miyagawa Y, Maruyama K, Konno N, Nakamachi T. Distribution of neuromedin U (NMU)-like immunoreactivity in the goldfish brain, and effect of intracerebroventricular administration of NMU on emotional behavior in goldfish. Peptides 2022; 156:170846. [PMID: 35905944 DOI: 10.1016/j.peptides.2022.170846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 07/22/2022] [Accepted: 07/25/2022] [Indexed: 10/16/2022]
Abstract
Neuromedin U (NMU) is a multifunctional neuropeptide implicated in regulation of smooth muscle contraction in the circulatory and digestive systems, energy homeostasis and the stress response, but especially food intake in vertebrates. Recent studies have indicated the possible involvement of NMU in the regulation of psychomotor activity in rodents. We have identified four cDNAs encoding three putative NMU variants (NMU-21, -25 and -38) from the goldfish brain and intestine. Recently, we have also purified these NMUs and the truncated C-terminal form NMU-9 from these tissues, and demonstrated their anorexigenic action in goldfish. However, there is no information on the brain localization of NMU-like immunoreactivity and the psychophysiological roles of NMU in fish. Here, we investigated the brain distribution of NMU-like immunoreactivity and found that it was localized throughout the fore- and mid-brains. We subsequently examined the effect of intracerebroventricular (ICV) administration of NMU-21, which is abundant only in the brain on psychomotor activity in goldfish. As goldfish prefer the lower to the upper area of a tank, we developed an upper/lower area preference test in a tank for evaluating the psychomotor activity of goldfish using a personal tablet device without an automatic behavior-tracking device. ICV administration of NMU-21 at 10 pmol g-1 body weight (BW) prolonged the time spent in the upper area of the tank, and this action mimicked that of ICV administration of the central-type benzodiazepine receptor (CBR) agonist tofisopam at 100 pmol g-1 BW. These results suggest that NMU-21 potently induces anxiolytic-like action in the goldfish brain.
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Affiliation(s)
- Kouhei Matsuda
- Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama 930-8555, Japan; Laboratory of Regulatory Biology, Graduate School of Innovative Life Sciences, University of Toyama, Toyama 930-8555, Japan.
| | - Keisuke Watanabe
- Laboratory of Regulatory Biology, Graduate School of Innovative Life Sciences, University of Toyama, Toyama 930-8555, Japan
| | - Yoshiki Miyagawa
- Laboratory of Regulatory Biology, Department of Biology, Faculty of Science, University of Toyama, Toyama 930-8555, Japan
| | - Keisuke Maruyama
- Laboratory of Veterinary Physiology, Department of Veterinary Science, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Norifumi Konno
- Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama 930-8555, Japan
| | - Tomoya Nakamachi
- Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama 930-8555, Japan
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Watanabe K, Konno N, Nakamachi T, Matsuda K. Intracerebroventricular administration of α-melanocyte-stimulating hormone (α-MSH) enhances thigmotaxis and induces anxiety-like behavior in the goldfish Carassius auratus. Peptides 2021; 145:170623. [PMID: 34375685 DOI: 10.1016/j.peptides.2021.170623] [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: 06/23/2021] [Revised: 08/04/2021] [Accepted: 08/05/2021] [Indexed: 12/23/2022]
Abstract
α-Melanocyte-stimulating hormone (α-MSH) is a body pigmentation-regulating hormone secreted from the intermediate lobe of the pituitary in vertebrates. It is also produced in the brain, and acts as an anorexigenic neuropeptide involved in feeding regulation. In rodents, intracerebroventricular (ICV) administration of α-MSH has been shown to affect not only feeding behavior, but also psychomotor activity. However, there is still no information regarding the psychophysiological effects of α-MSH on behavior in fish. Therefore, we examined the effect of synthetic α-MSH on psychomotor activity in goldfish. Since this species prefers the edge to the central area of a tank, we used this as a preference test for assessing psychomotor activity. When α-MSH was administered ICV at 1 and 10 pmol g-1 body weight (BW), the time spent in the edge area of a tank was prolonged at 10 pmol g-1 BW. However, α-MSH at these doses did not affect locomotor activity. The action of α-MSH mimicked those of FG-7142 (a central-type benzodiazepine receptor (CBR) inverse agonist with an anxiogenic effect) at 10 pmol g-1 BW and melanotan II (a melanocortin 4 receptor (MC4R) agonist) at 50 pmol g-1 BW, whereas ICV administration of tofisopam (a CBR agonist with an anxiolytic effect) at 10 pmol g-1 BW prolonged the time spent in the central area. The anxiogenic-like effect of α-MSH was abolished by treatment with the MC4R antagonist HS024 at 50 pmol g-1 BW. These data indicate that α-MSH affects psychomotor activity in goldfish, and exerts an anxiogenic-like effect via the MC4R-signaling pathway.
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Affiliation(s)
- Keisuke Watanabe
- Laboratory of Regulatory Biology, Graduate School of Innovative Life Sciences, University of Toyama, Toyama, 930-8555, Japan
| | - Norifumi Konno
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama, 930-8555, Japan; Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama, 930-8555, Japan
| | - Tomoya Nakamachi
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama, 930-8555, Japan; Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama, 930-8555, Japan
| | - Kouhei Matsuda
- Laboratory of Regulatory Biology, Graduate School of Innovative Life Sciences, University of Toyama, Toyama, 930-8555, Japan; Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama, 930-8555, Japan; Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama, 930-8555, Japan.
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Matsuda K, Yoshida D, Watanabe K, Yokobori E, Konno N, Nakamachi T. Effect of intracerebroventricular administration of two molecular forms of sulfated CCK octapeptide on anxiety-like behavior in the zebrafish danio rerio. Peptides 2020; 130:170330. [PMID: 32445877 DOI: 10.1016/j.peptides.2020.170330] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 05/11/2020] [Accepted: 05/13/2020] [Indexed: 12/26/2022]
Abstract
Cholecystokinin octapeptide with sulfate (CCK-8s) regulates feeding behavior and psychomotor activity. In rodents and goldfish, intracerebroventricular (ICV) injection of CCK-8s decreases food intake and also induces anxiety-like behavior. The zebrafish has several merits for investigating the psychophysiological roles of neuropeptides. However, little is known about the brain localization of CCK and the behavioral action of CCK-8s in this species. Here we investigated the brain localization of CCK-like immunoreactivity and found that it was distributed throughout the brain. As CCK-like immunoreactivity was particularly evident in the ventral habenular nucleus, the interpeduncular nucleus and superior raphe, we subsequently examined the effect of zebrafish (zf) CCK-8s on psychomotor control. Since the zebrafish possesses two molecular forms of zfCCK-8s (zfCCKA-8s and zfCCKB-8s), two synthetic peptides were administered intracerebroventricularly at 1, 5 and 10 pmol g-1 body weight (BW). As the zebrafish shows a greater preference for the lower area of a tank than for to the upper area, we used this preference for assessment of anxiety-like behavior. ICV administration of zfCCKA-8 s or zfCCKB-8s at 10 pmol g-1 BW significantly shortened the time spent in the upper area. The actions of these peptides mimicked that of the central-type benzodiazepine receptor inverse agonist FG-7142 (an anxiogenic agent) at 10 pmol g-1 BW. The anxiogenic-like action of the two peptides was attenuated by treatment with the CCK receptor antagonist proglumide at 200 pmol g-1 BW. These results indicate that zfCCKA-8s and zfCCKB-8s potently induce anxiety-like behavior via the CCK receptor-signaling pathway in the zebrafish brain.
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Affiliation(s)
- Kouhei Matsuda
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan; Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama 930-8555, Japan; Laboratory of Regulatory Biology, Graduate School of Innovative Life Sciences, University of Toyama, Toyama 930-8555, Japan.
| | - Daisuke Yoshida
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan
| | - Keisuke Watanabe
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan
| | - Eri Yokobori
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan
| | - Norifumi Konno
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan; Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama 930-8555, Japan
| | - Tomoya Nakamachi
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan; Laboratory of Regulatory Biology, Faculty of Science, Academic Assembly, University of Toyama, Toyama 930-8555, Japan
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9
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Araishi K, Watanabe K, Yamazaki T, Nakamachi T, Matsuda K. Intracerebroventricular administration of arginine vasotocin (AVT) induces anorexigenesis and anxiety-like behavior in goldfish. Peptides 2019; 119:170118. [PMID: 31279654 DOI: 10.1016/j.peptides.2019.170118] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 06/13/2019] [Accepted: 07/03/2019] [Indexed: 12/18/2022]
Abstract
Arginine vasotocin (AVT) is known as a neurohypophyseal hormone that regulates water- and mineral-balance in non-mammalian vertebrates. Recent studies revealed that AVT also exerts central effects on behavior. The goldfish has several merits for evaluation of behavioral changes. However, there is few information on the behavioral action of AVT in this species. Here we examined the effects of AVT on food intake and psychomotor activity. AVT was administered intracerebroventricularly at 1, 5 and 10 pmol g-1 body weight (BW). Intracerebroventricular (ICV) administration of AVT at 5 and 10 pmol g-1 BW significantly decreased food intake during 30 min after injection and recovery from anesthesia. The AVT-induced anorexigenic action was attenuated by treatment with the AVT receptor V1aR antagonist Manning compound (MC) at 50 pmol g-1 BW. As the goldfish tends to prefer the lower to the upper area of a tank, we used this preference behavior for assessing psychomotor activity during a 30-min observation period. ICV administration of AVT at 1, 5 and 10 pmol g-1 BW significantly prolonged the time spent in the lower area, but did not affect locomotor activity in the tank at any dose. The action of AVT was similar to that of the central-type benzodiazepine receptor inverse agonist FG-7142 at 10 pmol g-1 BW. AVT-induced anxiety-like behavior was blocked by treatment with MC at 50 pmol g-1 BW. These results indicate that AVT affects food intake and psychophysiological status, and also induces anorexigenic- and anxiogenic-like actions via the V1aR-signaling pathway in the goldfish brain.
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Affiliation(s)
- Koh Araishi
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan
| | - Keisuke Watanabe
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan
| | - Takumi Yamazaki
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan
| | - Tomoya Nakamachi
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan
| | - Kouhei Matsuda
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan; Laboratory of Regulatory Biology, Graduate School of Innovative Life Sciences, University of Toyama, Toyama 930-8555, Japan.
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