Changes in the Neuropeptide Y mRNA Expression in Oncorhynchus mykiss at Different Feeding Frequencies

Nahayat, Mozhdeh; Zakeri, Mohammad; Salati, Amir Parviz; Qasemi, Seyed Ahmad

doi:10.1155/2022/2080639

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…In rainbow trout, treatment (icv) with NPY dose-dependently increased food intake at 2 to 3 hours (45), supporting an orexigenic role. In relation to mealtime, brain expression of npy has been shown to fluctuate widely, with increases occurring minutes before mealtime even when different feeding frequencies are scheduled throughout the day (46). In the same line, increases in npy mRNA levels in the hypothalamus of trout after 3 weeks of fasting have been reported (47).…”

Section: Feeding Influence On Mrna Levels Of Neuropeptides In Diencep...mentioning

confidence: 90%

Unraveling the periprandial changes in brain serotonergic activity and its correlation with food intake-related neuropeptides in rainbow trout Oncorhynchus mykiss

Chivite,

Ceinos,

Cerdá-Reverter

et al. 2023

Front. Endocrinol.

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This study explored changes in brain serotonin content and activity together with hypothalamic neuropeptide mRNA abundance around feeding time in rainbow trout, as well as the effect of one-day fasting. Groups of trout fed at two (ZT2) and six (ZT6) hours after lights on were sampled from 90 minutes before to 240 minutes after feeding, while additional groups of non-fed trout were also included in the study. Changes in brain amine and metabolite contents were measured in hindbrain, diencephalon and telencephalon, while in the diencephalon the mRNA abundance of tryptophan hydroxylase (tph1, tph2), serotonin receptors (5htr1a, 5htr1b and 5htr2c) and several neuropeptides (npy, agrp1, cartpt, pomca1, crfb) involved in the control of food intake were also assessed. The results showed changes in the hypothalamic neuropeptides that were consistent with the expected role for each in the regulation of food intake in rainbow trout. Serotonergic activity increased rapidly at the time of food intake in the diencephalon and hindbrain and remained high for much of the postprandial period. This increase in serotonin abundance was concomitant with elevated levels of pomca1 mRNA in the diencephalon, suggesting that serotonin might act on brain neuropeptides to promote a satiety profile. Furthermore, serotonin synthesis and neuronal activity appear to increase already before the time of feeding, suggesting additional functions for this amine before and during food intake. Exploration of serotonin receptors in the diencephalon revealed only small changes for gene expression of 5htr1b and 5htr2c receptors during the postprandial phase. Therefore, the results suggest that serotonin may play a relevant role in the regulation of feeding behavior in rainbow trout during periprandial time, but a better understanding of its interaction with brain centers involved in receiving and processing food-related signals is still needed.

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Section: Feeding Influence On Mrna Levels Of Neuropeptides In Diencep...mentioning

confidence: 90%

Unraveling the periprandial changes in brain serotonergic activity and its correlation with food intake-related neuropeptides in rainbow trout Oncorhynchus mykiss

Chivite,

Ceinos,

Cerdá-Reverter

et al. 2023

Front. Endocrinol.

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Impact of feeding diets with enhanced vegetable protein content and presence of umami taste-stimulating additive on gastrointestinal amino acid sensing and feed intake regulation in rainbow trout

Calo,

Comesaña,

Fernández-Maestú

et al. 2024

Aquaculture

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Effects of short-time fasting and feeding frequencies within 24 hours on histology, cholecystokinin and trypsin enzyme activities of digestive organs in black bream, Megalobrama pellegrini (Tchang, 1930), juvenile

Li,

Tang,

Lin

et al. 2024

Preprint

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To study the regulation and feedback mechanism of cholecystokinin and trypsin in black bream, Megalobrama pellegrini (Tchang, 1930) 60 days after hatching under 15 days short-term fasting and different feeding frequencies within 24 hours during the same period, M. pellegrini (wet weight 183.75 ± 61.16 mg, total length 20.74 ± 4.08 mm) developed in a recirculating aquaculture system were selected as the subject. In the short-term fasting trial, the body weight, trypsin, and CCK of the feeding control group (FCG) were higher than those of the fasting test group (FTG). Trypsin and CCK in FTG reached the lowest value on the ninth day and the CCK content reached the highest value on the 11th day. A negative feedback regulation of CCK and trypsin had not been found in this trial. The degree of damage to intestinal chorionic epithelial cells was higher than that of hepatopancreas, and detachment of epithelial cells and the striatal border was the main damage. In the 24-hour daily rhythm experiment, juvenile fish were randomly assigned to (A) once feeding, (B) twice feeding, (C) three times feeding, (D) fasting. CCK showed a minimum value at 1:00+ in group A, while a peak occurred at night in group B\C\D and a maximum value in group C, and a single satiety stimulus can lead to increased hunger. The four treatment groups had an apparent closed-loop regulation while the control point of the fasting group (D) shifted forward to the next day. Different feeding frequencies in a single day had no direct effect on the long-term fluctuation of CCK and trypsin diurnal rhythm. Feeding three times a day was beneficial to the individual growth of juvenile M. pellegrini, a better growth results may be produced in the long term. This study aimed to provide a reference for the feeding strategy of juvenile M. pellegrini in the RAS.

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Changes in the Neuropeptide Y mRNA Expression in Oncorhynchus mykiss at Different Feeding Frequencies

Abstract: In this study, the relationship between feeding time preference and appetite in Oncorhynchus mykiss with scheduled feeding frequencies was investigated using neuropeptide Y (NPY). Samples ( n = 288 , initial weight: 38.72 ± 2.99 g) were stocked … Show more

Cited by 4 publications

References 30 publications

Unraveling the periprandial changes in brain serotonergic activity and its correlation with food intake-related neuropeptides in rainbow trout Oncorhynchus mykiss

Unraveling the periprandial changes in brain serotonergic activity and its correlation with food intake-related neuropeptides in rainbow trout Oncorhynchus mykiss

Impact of feeding diets with enhanced vegetable protein content and presence of umami taste-stimulating additive on gastrointestinal amino acid sensing and feed intake regulation in rainbow trout

Effects of short-time fasting and feeding frequencies within 24 hours on histology, cholecystokinin and trypsin enzyme activities of digestive organs in black bream, Megalobrama pellegrini (Tchang, 1930), juvenile

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