Abstract
To explore the effect of CCK on food intake in Siberian sturgeon, cck cDNA sequence of 1005 bp was obtained, and cck mRNA possessed the highest expression in brain. The expressions of cck were significantly increased after feeding 1 and 3 h, while displaying significant decrease after fasting within 15 days in brain and duodenum. Re-feeding for 3 days induced cck level returned to basic level. Acute i.p. injection experiment showed 100 and 200 ng/g BW CCK8 inhibited the food intake in 0–1 h together with the cumulative food intake within 3 h. 7 days chronic i.p. injection of 100 and 200 ng/g BW CCK8, both daily food intake and cumulative food intake were significantly decreased. In addition, chronic i.p injection of CCK8 induced the expression of feeding related factors changes including cck, ucn3, cart, apelin, pyy and npy in respective organization. Moreover, as revealed by the results, Lorglumide, the CCK1R selective antagonist, effectively reversed the inhibitory effects of CCK8 on food intake and the levels of feeding related factors. On the other hand, LY 225910, the CCK2R selective antagonist, partially reversed these effects. These results indicate CCK is a satiety factor inhibits the feeding of Siberian sturgeon primarily through CCK1R.
Highlights
Feeding, a complex behavior, is essential to promote animal survival and might be affected by factors, such as light, temperature, reproduction and even the type of food consumed
In the current research work, Siberian sturgeon cck cDNA sequence was obtained for the first time
Through the comparison of CCK amino acid sequences in several animals, it was observed that the C-terminal peptide was highly conserved, octapeptide structure
Summary
A complex behavior, is essential to promote animal survival and might be affected by factors, such as light, temperature, reproduction and even the type of food consumed. Food intake is controlled by a central and peripheral feeding system connected by a network of peptides and hormones that regulate hunger and satiety[1,2,3]. On this intricate network, an intestinal peptide named CCK, detected in the brain, has been recently implicated on feeding regulation in rats[4,5]. The CCK8, together with its receptor selective antagonists co-injection experiments were utilized for the detection of the amount of food intake and the expression of feeding related factors, with an aim of studying the mechanism of CCK in feeding regulation
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