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Noradrenaline-induced feeding responses in the rat do not depend on food characteristics

100%
Swiergiel A. H., Wieczorek M.
Acta Neurobiologiae Experimentalis
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2008
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vol. 68
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issue 3
354-361
EN
The noradrenergic system of the hypothalamic paraventricular nuclei (PVN) has been associated with feeding, but whether it controls feeding in a way that is relevant to energy balance is still unclear. Rats were maintained on a high energy, carbohydrate-rich diet (HC), or a low energy, carbohydrate-free, protein-rich diet (LP), until their daily energy intakes equalized. When injected with noradrenaline (NA) into the PVN, they ingested the same amounts of both diets so that the animals on the LP diet consumed only half the total energy of those on the HC diet. Continuous delivery of NA into the PVN via a microdialysis probe induced chewing on non-nutritive pieces of corks. The same chewing pattern could again be elicited by the subsequent NA deliveries. It is concluded that the nutritional value of a diet is irrelevant to the NA feeding response. The failure of NA administration to increase rat feeding in terms of energy intake, combined with its ability to stimulate chewing, suggests that the primary role of the NA system of the PVN may not be controlling the carbohydrate and energy intake, but rather gating behavioral responses that under appropriate circumstances may lead to ingestion.
2
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Neuroendocrine mechanism mediating fasting-induced suppression of luteinizing hormone secretion in female rats

75%
Maeda K., Tsakumara H.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 3
787-796
EN
Forty-eight hours fasting profoundly supresses LH secretion in female rats.The following neural pathway mediating fasting-induced suppression of LH secretion has been suggested by a series of experiment:a signal associated with fasting emanting from the upper digestive tract reaches the A2 region in the medulla oblongata via afferent vagal nerve so as to activate the noradrenergic pathway projecting to the hypothalmic paraventricular nucleus (PVN); this results in an increased corticotropin-releasing hormone release to suppress LHRH release and than LH release.The PVN and A2 region of the medulla oblongata are the estogen feedback sites to activate the above-mentioned neural pathway.The estrogen feedback action on the PVN and A2 region is considered to be due to an increased expression of estrogen receptors in these nuclei after 48-h fasting.The response of gonadal axis during fasting could be due to the changes in some nutrients, such as glucose and free-fatty acids.In this context, malnutration could be a kind of stress accompanied by an increased feeding behavior and decresed gonadal activity.
3
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Effects of infusion of corticotropin-releasing factor antagonist into the locus coeruleus on freezing behavior and brain catecholamines in rats

75%
Swiergiel A.
Acta Neurobiologiae Experimentalis
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2003
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vol. 63
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issue 1
9-16
EN
Administration of 0.2 mug of alpha-helical CRF9-41 (corticotropin-releasing factor receptor antagonist, ahCRF9-41) into the locus coeruleus (LC) region significantly reduced footshock-induced freezing behavior in adult male rats. Changes in the concentrations of noradrenaline (NA), dopamine and their catabolites in cortex, hippocampus and hypothalamus of footshocked rats were reminiscent of those observed in stressed animals. Rats injected with ahCRF prior to footshock displayed cerebral catecholamine responses that were not different from controls injected with vehicle. The results confirm earlier findings that CRF receptors at the LC region may mediate freezing and behavioral expression of fear. However, the results also suggest that though CRF receptors within the LC region mediate footshock-induced behavior, they are not necessarily involved in the short-term catecholamine response to footshock.
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