{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,30]],"date-time":"2026-04-30T23:28:48Z","timestamp":1777591728308,"version":"3.51.4"},"reference-count":68,"publisher":"PeerJ","license":[{"start":{"date-parts":[[2020,4,24]],"date-time":"2020-04-24T00:00:00Z","timestamp":1587686400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Agro-scientific Research in the Public Interest: the evaluation of new protein sources to replace fish meal in aquafeeds","award":["201303053"],"award-info":[{"award-number":["201303053"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:sec>\n               <jats:title>Background<\/jats:title>\n               <jats:p>As the primary source of protein for aquaculture, fishmeal has reached the extremity of sustainable development, our previous studies have proven that rice protein concentrate and squid paste are outstanding protein source and stimulant for <jats:italic>Pelodiscus sinensis<\/jats:italic>. However, little attention has been given to the molecular mechanism of the appetite modulated by the dietary nutrient factor, especially for a reptile. Thus, the present study aimed to evaluate feed intake and brain-gut dynamic responses to dietary rice protein concentrate and squid paste in Chinese soft-shelled turtle <jats:italic>Pelodiscus sinensis<\/jats:italic>.<\/jats:p>\n            <\/jats:sec>\n            <jats:sec>\n               <jats:title>Methods<\/jats:title>\n               <jats:p>Three isonitrogenous and isoenergetic practical diets were formulated including 60% fishmeal (CT), 42% fishmeal + 18% rice protein concentrate (RP) and 42% fishmeal + 18% rice protein concentrate + 1% squid paste (RPS), respectively. Microcapsule lysine was supplemented in RP and RPS diets to balance the amino acid profile. Turtles (initial weight 30.65 \u00b1 0.97 g) were fed three times daily to apparent satiation. After the 8-week feeding trial, the turtles were exposed to 48h food deprivation, then the dynamic expression of the orexigenic and anorexigenic peptides were measured.<\/jats:p>\n            <\/jats:sec>\n            <jats:sec>\n               <jats:title>Results<\/jats:title>\n               <jats:p>The results showed that no significant effect was observed on feed intake when fishmeal was replaced by rice protein concentrate (<jats:italic>P<\/jats:italic>\u00a0=\u00a00.421), while significantly improved feed intake was found by squid paste supplemented (<jats:italic>P<\/jats:italic>\u00a0=\u00a00.02). The mRNA expression of anorexigenic peptides, such as leptin receptor, insulin receptor, pro-opiomelanocortin, cocaine and amphetamine-regulated transcript, cholecystokinin (and its receptor) and glucagon-like peptide-1 receptor in the brain increased significantly at 3 h past feeding (<jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.05), and then decreased. Nevertheless, neuropeptide Y and peptide YY mRNA expression showed the valley at 3h and peak at 12h past feeding. Intestinal cholecystokinin receptor and glucagon-like peptide-1 receptor mRNA expression showed no difference during the postprandial time (<jats:italic>P<\/jats:italic>\u00a0&gt;\u00a00.05). The results suggested that squid paste is an outstanding stimulant for <jats:italic>Pelodiscus sinensis<\/jats:italic>. Furthermore, the orexigenic and anorexigenic peptides evaluated here might play an essential role in short-term fasting to this species, of which the dynamic expression levels were regulated by squid paste.<\/jats:p>\n            <\/jats:sec>","DOI":"10.7717\/peerj.9031","type":"journal-article","created":{"date-parts":[[2020,4,24]],"date-time":"2020-04-24T08:07:33Z","timestamp":1587715653000},"page":"e9031","source":"Crossref","is-referenced-by-count":7,"title":["Dietary squid paste supplementation promotes feed intake via brain-gut dynamic response in Chinese soft-shelled turtle <i>Pelodiscus sinensis<\/i>"],"prefix":"10.7717","volume":"8","author":[{"given":"Cunxin","family":"Sun","sequence":"first","affiliation":[{"name":"Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi, China"},{"name":"Laboratory of Aquatic Nutrition and Ecology, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yu","family":"Qian","sequence":"additional","affiliation":[{"name":"Laboratory of Aquatic Nutrition and Ecology, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenbin","family":"Liu","sequence":"additional","affiliation":[{"name":"Laboratory of Aquatic Nutrition and Ecology, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Weina","family":"Xu","sequence":"additional","affiliation":[{"name":"Laboratory of Aquatic Nutrition and Ecology, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China"},{"name":"School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kaizhou","family":"Wang","sequence":"additional","affiliation":[{"name":"Laboratory of Aquatic Nutrition and Ecology, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bo","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"4443","published-online":{"date-parts":[[2020,4,24]]},"reference":[{"key":"10.7717\/peerj.9031\/ref-1","doi-asserted-by":"publisher","first-page":"393","DOI":"10.1016\/j.aquaculture.2006.11.015","article-title":"Replacement of fish meal in practical diets for the Pacific white shrimp (Litopenaeus vannamei) reared 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