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Bilateral lesions of the pedunculopontine tegmental nucleus affect feeding induced by electrical stimulation of the ventral tegmental area.

100%
Trojniar W., Staszewska M.
Acta Neurobiologiae Experimentalis
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1995
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vol. 55
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issue 3
201-206
EN
The pedunculopontine tegmental nucleus (PPN) is anatomically connected with dopminergic cells in the ventral mesencephalon, which are known to participate in the regulation of various adaptive appetitive behaviours.In present experiment we studied a possible involvment of PPN in feeding elicited by the stimulation of the ventral tegmental area (VTA).It was found that bilateral electrolytic lesionong of the PPN affected VTA-elicited feeding.However, the effects were diverse and showed dependence on the localization of the lesion within the PPN area.Lesions localized anteriorly in the PPN impaired VTA feeding whereas those involving the middle portion of the nucleus facilitated electrically elicited food ingestion.A precise alignment of the lesion and the area activated at the site of stimulation appeared crucial for the effect of the lesion.The results indicate that PPN belongs to the central feeding circuitry and it contains both activating and inhibiting elements directed to the ventral tegmental area.
2
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Effect of unilateral injection of MK-801 into the area of A10 cells on feeding evoked by stimulation of homologous area in the contralateral hemisphere

100%
Maliszewska-Scislo M., Trojniar T. W., Trojniar W.
Acta Neurobiologiae Experimentalis
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2000
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vol. 60
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issue 4
489-494
EN
It was found previously that unilateral electrolytic and 6-OHDA lesions of the ventral tegmental area (VTA) and unilateral intra-VTA injection of bicuculline resulted in facilitation of behavioral responses evoked by electrical stimulation of the symmetrical VTA area in the contralateral hemisphere. We postulated that ?the contralateral facilitation effect?, which may reflect the yet unexplored mechanism of immediate compensation after acute unilateral brain injury, is attributable to the A10 DA neurons and their regulatory inputs. The present study was aimed at examining the possible involvement of NMDA-mediated glutamatergic transmission in VTA in the ?contralateral facilitation effect?. The behavioral model of the VTA stimulation-induced feeding in rats was used. Latency to eat was measured as a function of stimulation frequency before and after unilateral intra-VTA injection of non-competitive NMDA receptors antagonist, MK-801, (doses 0.0, 1.25 and 2.5 mg). MK-801 caused a dose-dependent augmentation of feeding evoked by stimulation of the contralateral VTA, which manifested as a decrease in the reaction frequency threshold and a leftward shift of the latency/frequency curve. Dose 2.5 mg replicated the facilitatory effect of electrolytic and 6-OHDA lesions. The results are interpreted in terms of MK-801-evoked depression of excitatory glutamatergic tone over A10 DA cells and compensatory increase in DA release in the contralateral hemisphere.
3
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Influence of bombesin on thresholds for feeding and reward in the rat

88%
Bushnik T., Bielajew C., Konkle A. M. T., Merali Z.
Acta Neurobiologiae Experimentalis
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1999
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vol. 59
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issue 4
295-303
EN
Bombesin's purported role in satiety mechanisms prompted this investigation of its effects on thresholds for stimulation-induced feeding and self-stimulation in the rat. Single electrodes were implanted in the lateral hypothalamus and the ability of each electrode to support self-stimulation and stimulation-induced feeding was evaluated at four current levels between 80 and 320 muA. The frequency thresholds associated with each current value were assessed following four intraperitoneal doses of bombesin, 2, 4, 8, and 16 mug/kg, as well as a saline dose. Bombesin increased the thresholds for stimulation-induced feeding at doses known to reduce food intake without influencing self-stimulation thresholds. From these findings we conclude that (1) the effects of peripheral bombesin on stimulation-induced feeding are analogous to its effects on normal feeding and (2) the data provide additional evidence for a pharmacological dissociation between stimulation-induced feeding and reward.
4
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Augmentation of ventral tegmental area stimulation-induced feeding by both stimulation and lesion of the contralateral ventral tegmental area in the rat

75%
Maliszewska- S. M., Trojniar W.
Acta Neurobiologiae Experimentalis
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1999
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vol. 59
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issue 4
287-293
EN
Unilateral lesions of the ventral tegmental area (VTA) facilitate behavioral responses (feeding and exploration) induced by electrical stimulation of the VTA in the contralateral hemisphere. It was hypothesized that this facilitation may result from a lesion-induced compensatory increase in dopamine transmission in the intact hemisphere. In the present study we tested on the functional level the hypothesis that the activity of bilateral mesocorticolimbic systems is inversely related. For this purpose we compared the effect of unilateral subthreshold activation with the effect of subsequent unilateral lesion of VTA on feeding response evoked by electrical stimulation of the contralateral VTA. In male Wistar rats implanted with bilateral VTA electrodes stimulation-induced feeding was tested in a latency to feed - -stimulation frequency curve-shift paradigm. One electrode was used for induction of feeding reaction and the other electrode was used for concurrent stimulation (with the subthreshold current) and subsequent electrolytic lesioning of the contralateral VTA. It was found that both contralateral stimulation and subsequent lesion performed through the same electrode facilitated a feeding response that manifested as a decrease in the reaction's threshold and a leftward shift of the latency-frequency curve. The paradoxical similarity of the effects of the stimulation and lesion is discussed in terms of functional organization of the mesocorticolimbic system and adaptive changes in dopaminergic transmission.
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