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mRNA expression patterns for GH, PRL, SL, IGF-I and IGF-II during altered feeding status in rabbitfish, Siganus guttatus.

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Date
2007
Author
Ayson, Felix G.
de Jesus-Ayson, Evelyn Grace T.
Takemura, Akihiro
Page views
1,815
Subject
feeding behaviour ASFA
growth rate ASFA
hormones ASFA
nutrition ASFA
pituitary gland ASFA
reef fishes ASFA
secretion ASFA
starvation ASFA
feeding ASFA
gene expression ASFA
food availability ASFA
rhythms ASFA
liver ASFA
food ASFA
polymerase chain reaction ASFA
Siganus guttatus AGROVOC
somatotropin
prolactin AGROVOC
Somatolactin
Insulin-like growth factor-I
Insulin-like growth factor-II
Rabbitfish AGROVOC
mRNA
Feeding time
Reef fish
fasting AGROVOC
nutritional status AGROVOC
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Abstract
Feeding time is a major synchronizer of many physiological rhythms in many organisms. Alteration in the nutritional status, specifically fasting, also affects the secretion rhythms of growth hormone (GH) and insulin-like growth factor-I (IGF-I). In this study, we investigated whether the expression patterns for the mRNAs of GH, prolactin (PRL) and somatolactin (SL) in the pituitary gland, and insulin-like growth factor I and II (IGF-I and IGF-II) in the liver of juvenile rabbitfish (Siganus guttatus) follow a rhythm according to feeding time and whether these hormone rhythms changes with starvation. Hormone mRNA levels were determined by real time PCR. The daily expression pattern for the mRNAs of GH, PRL and SL was not altered whether food was given in the morning (10:00 h) or in the afternoon (15:00 h). The daily GH mRNA expression pattern, however, was affected when food was not available for 3 days. In contrast, the daily expression pattern for IGF-I mRNA reaches its peak at roughly 5–6 h after feeding. This pattern, however, was not observed with IGF-II mRNA. During 15-day starvation, GH mRNA levels in starved fish were significantly higher than the control fish starting on the 9th day of starvation until day 15. The levels returned to normal after re-feeding. In contrast to GH, PRL mRNA levels in starved fish were significantly lower than the control group starting on the 6th day of starvation until 3 days after re-feeding. SL mRNA levels were not significantly different between the control and starved group at anytime during the experiment. Both IGF-I and IGF-II mRNA levels in starved group were significantly higher than the control fish on the 3rd and 6th day of starvation. mRNA levels of both IGF-I and II in the starved fish decreased starting on the 9th day of starvation. While IGF-I mRNA levels in the starved group continued to decrease as starvation progressed, IGF-II mRNA levels were not significantly different from the control during the rest of the starvation period. The results indicate that aside from GH and IGF-I, PRL and IGF-II are likewise involved in starvation in rabbitfish.
URI
http://hdl.handle.net/10862/1720
Suggested Citation
Ayson, F. G., de Jesus-Ayson, E. G. T., & Takemura, A. (2007). mRNA expression patterns for GH, PRL, SL, IGF-I and IGF-II during altered feeding status in rabbitfish, Siganus guttatus. General and Comparative Endocrinology, 150(2), 196-204. https://doi.org/10.1016/j.ygcen.2006.08.001 
DOI
10.1016/j.ygcen.2006.08.001
Type
Article
ISSN
0016-6480
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