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Hypothalamus is involved in ghrelin secretion in the lactating rat.
2004 JUL 1 - (NewsRx.com & NewsRx.net) -- Scientists in Japan suggest there may be some hypothalamic involvement in ghrelin secretion in lactating rats.
When K. Shibata and colleagues measured the plasma concentration of ghrelin peptide during pregnancy and lactation in rats, they found that "[p]lasma ghrelin levels on days 10 and 15 of pregnancy were significantly lower than those of the non-pregnant rats. Thereafter, the plasma ghrelin levels on day 20 of pregnancy sharply increased to levels comparable with those in non-pregnant rats.
"Ghrelin peptide concentrations in the stomach did not change significantly during pregnancy," they said.
"In the hypothalamus," the researchers reported, "ghrelin mRNA levels were significantly lower on day 15 of pregnancy than in the non-pregnant rats. Also, plasma ghrelin levels were significantly lower in lactating dams than non-lactating controls on days 3 and 8 of lactation."
Shibata's team explored any involvement in the regulation of plasma ghrelin during lactation by prolactin and oxytocin, as well. "Although plasma prolactin levels were decreased by the administration of bromocriptine, plasma ghrelin levels did not differ significantly between vehicle- and drug-treated lactating rats.
"Administration of haloperidol produced a marked increase in plasma prolactin levels as compared with the non-lactating controls. However, plasma ghrelin levels were not significantly different between ...
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