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The effect of food deprivation and refeeding on the liver, thyroid hormones and transthyretin in sea bream
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Advisor(s)
Abstract(s)
There was a significant reduction in body weight of sea bream Sparus aurata and the
hepatosomatic index after 3 weeks food deprivation. Liver biochemical indices and morphology
were altered by food deprivation, there was a loss of eosin staining in hepatocyte
cytoplasm and the appearance of large depleted vacuoles. Cell and nuclear area were
significantly reduced (P<0·001) and did not return to control values after 1 week of refeeding.
The water, lipid, glycogen and protein content of the liver was significantly reduced by 3 weeks
fasting but recovered rapidly after 1 week refeeding. Food restriction also had a marked effect
on circulating thyroid hormones and the concentration of plasma T3 (33·98 12·47 ng ml 1)
and T4 (16·54 9·5 ng ml 1) was significantly (P<0·001) lower than the control (66·52 13·4
and 56·83 7·3, respectively). Refeeding for 1 week restored circulating T3 (P<0·05) close to
control levels but did not significantly affect the concentration of T4. Northern blotting with an
homologous probe for transthyretin (TTR) demonstrated clearly the expression of a single
mRNA transcript of 0·7 kb for this protein in the liver. The level of TTR message was
substantially reduced below control levels in the liver of fasted fish and 1 week refeeding failed
to restore expression.
Description
Keywords
Energy reserves Food restritction Refeeding Liver Thyroid hormones Transthyretin
Citation
Deborah Power, J. Melo e C.R.A. Santos, "The effect of food deprivation and refeeding on the liver, thyroid hormones and transthyretin in sea bream" in Journal of Fish Biology (2000) 56, 374–387.
Publisher
Wiley