The Effects on Feeding of Galanin and M40 When Injected Into the Nucleus of the Solitary Tract, the Lateral Parabrachial Nucleus, and the Third Ventricle

1999 ◽  
Vol 67 (2) ◽  
pp. 259-267 ◽  
Author(s):  
Frank H Koegler ◽  
David A York ◽  
George A Bray
Keyword(s):  
Third Ventricle ◽  
Parabrachial Nucleus ◽  
Solitary Tract ◽  
The Third ◽  
Lateral Parabrachial Nucleus

Lateral parabrachial lesions attenuate ingestive effects of area postrema lesions

1989 ◽  
Vol 256 (2) ◽  
pp. R306-R312 ◽  
Author(s):  
G. L. Edwards ◽  
R. C. Ritter
Keyword(s):  
Short Duration ◽  
Area Postrema ◽  
Parabrachial Nucleus ◽  
Solitary Tract ◽  
Palatable Food ◽  
Lateral Parabrachial Nucleus ◽  
Ingestive Behaviors

Lesions of the area postrema and adjacent nucleus of the solitary tract (AP lesions) cause rats to consume increased amounts of palatable food in short duration tests. Because the lateral parabrachial nucleus (lPBN) receives a prominent afferent projection from the AP and adjacent nucleus of the solitary tract, it is possible the lPBN plays a role in the altered ingestive behaviors observed in AP-lesioned rats. The present study examines the role of the lPBN in overingestion of highly palatable foods subsequent to AP lesions. We found that lesions of the lPBN alone did not cause rats to consume increased amounts of palatable food. Rather, when lPBN lesions were produced before AP lesions, increased intake of highly palatable food did not occur. Moreover, when AP-lesioned rats received subsequent lPBN lesions, the previously established overingestion of palatable foods was abolished. These results indicate that the lPBN is necessary in the pathogenesis of AP lesion-induced overingestion of highly palatable foods.

Intragastric hypertonic saline increases vasopressin and central Fos immunoreactivity in conscious rats

1997 ◽  
Vol 272 (3) ◽  
pp. R750-R758 ◽  
Author(s):  
S. H. Carlson ◽  
A. Beitz ◽  
J. W. Osborn
Keyword(s):  
Hypertonic Saline ◽  
Paraventricular Nucleus ◽  
Supraoptic Nucleus ◽  
Area Postrema ◽  
Parabrachial Nucleus ◽  
Solitary Tract ◽  
Plasma Osmolarity ◽  
Systemic Blood ◽  
Conscious Rats ◽  
Lateral Parabrachial Nucleus

Although experimental evidence supports peripheral osmoreceptor modulation of arginine vasopressin (AVP) release, a local osmotic signal required for osmoreceptor activation has yet to be identified using physiological sodium loads. Additionally, the central pathway involved in peripheral control of AVP has not been clearly established. Experiments were conducted to examine the effect of intragastric saline on portal venous osmolarity, plasma AVP (P(AVP)), and Fos immunoreactivity. In anesthetized rats, intragastric infusion (2.9 ml) of hypertonic (600 mosM) saline significantly increased portal venous osmolarity while systemic blood osmolarity remained constant. In conscious rats, intragastric hypertonic saline significantly elevated P(AVP) (3.6 +/- 1.3 to 5.8 +/- 1.9 pg/ml), whereas no changes were observed in plasma osmolarity in either the isotonic (296.2 +/- 1.4 to 297.6 +/- 1.1 mosM) or hypertonic (291.7 +/- 1.7 to 291.4 +/- 1.8 mosM) group. Finally, intragastric hypertonic saline significantly increased Fos immunoreactivity in the nucleus of the solitary tract (NTS), area postrema (AP), lateral parabrachial nucleus (LPBN), supraoptic nucleus (SON), and paraventricular nucleus (PVN). These results indicate that intragastric hypertonic saline produces a portal venous osmotic signal that triggers peripheral osmoreceptors to stimulate AVP release while activating the NTS, AP, and LPBN in addition to the SON and PVN.

Evidence that paraventricular nucleus oxytocin neurons link hypothalamic leptin action to caudal brain stem nuclei controlling meal size

2004 ◽  
Vol 287 (1) ◽  
pp. R87-R96 ◽  
Author(s):  
James E. Blevins ◽  
Michael W. Schwartz ◽  
Denis G. Baskin
Keyword(s):  
Food Intake ◽  
Paraventricular Nucleus ◽  
Third Ventricle ◽  
Oxytocin Receptor ◽  
Solitary Tract ◽  
Toxin B ◽  
Leptin Signaling ◽  
Cholera Toxin B ◽  
The Third ◽  
Increased Sensitivity

Hindbrain projections of oxytocin neurons in the parvocellular paraventricular nucleus (pPVN) are hypothesized to transmit leptin signaling from the hypothalamus to the nucleus of the solitary tract (NTS), where satiety signals from the gastrointestinal tract are received. Using immunocytochemistry, we found that an anorectic dose of leptin administered into the third ventricle (3V) increased twofold the number of pPVN oxytocin neurons that expressed Fos. Injections of fluorescent cholera toxin B into the NTS labeled a subset of pPVN oxytocin neurons that expressed Fos in response to 3V leptin. Moreover, 3V administration of an oxytocin receptor antagonist, [d-(CH2)5,Tyr(Me)2,Orn8]-vasotocin (OVT), attenuated the effect of leptin on food intake over a 0.5- to 4-h period ( P < 0.05). Furthermore, to determine whether oxytocin contributes to leptin's potentiation of Fos activation within NTS neurons in response to CCK, we counted the number of Fos-positive neurons in the medial NTS (mNTS) after 3V administration of OVT before 3V leptin and intraperitoneal CCK-8 administration. OVT resulted in a significant 37% decrease ( P < 0.05) in the potentiating effect of leptin on CCK activation of mNTS neuronal Fos expression. Furthermore, 4V OVT stimulated 2-h food intake by 43% ( P < 0.01), whereas 3V OVT at the same dose was ineffective. These findings suggest that release of oxytocin from a descending pPVN-to-NTS pathway contributes to leptin's attenuation of food intake by a mechanism that involves the activation of pPVN oxytocin neurons by leptin, resulting in increased sensitivity of NTS neurons to satiety signals.

Endoscopic Surgery for Tumors in and around the Third Ventricle

2020 ◽  
Author(s):  
Kenichi Oyama ◽  
Toshio Hirohata ◽  
Keisuke Onoda ◽  
Shigeyuki Tahara ◽  
Akira Teramoto ◽  
...  
Keyword(s):  
Endoscopic Surgery ◽  
Third Ventricle ◽  
The Third

Clinical features and operative technique of transinfundibular craniopharyngioma

2020 ◽  
Vol 133 (1) ◽  
pp. 119-128 ◽  
Author(s):  
Bin Tang ◽  
ShenHao Xie ◽  
GuanLin Huang ◽  
ZhiGang Wang ◽  
Le Yang ◽  
...  
Keyword(s):  
Clinical Features ◽  
Operative Technique ◽  
Third Ventricle ◽  
Radical Resection ◽  
The Third ◽  
Expanded Endonasal Approach ◽  
Sequencing Studies ◽  
Characteristic Features ◽  
Mri Study ◽  
Adamantinomatous Craniopharyngioma

OBJECTIVETransinfundibular craniopharyngioma (TC) is one of the 4 subtypes of suprasellar craniopharyngioma. In this study, the authors analyzed the clinical features of and operative technique for TC.METHODSA total of 95 consecutive cases of suprasellar craniopharyngioma that had been resected via the endoscopic expanded endonasal approach were retrospectively reviewed. Patients were divided into 2 groups: 34 in the TC group and 61 in the nontransinfundibular craniopharyngioma (NC) group. Clinical and radiographic features, intraoperative findings, histopathological and genetic findings, and surgical outcomes were analyzed and compared between groups.RESULTSCompared with NC, TC was mostly seen in adult patients (97.1%); it was rare in children (2.9%). Clinical presentations tended toward headache, hydrocephalus, and diabetes insipidus. The relatively smaller volume, midline location (consistent with the stalk position), unidentifiable stalk, no shift of the third ventricle, and greater likelihood to involve the third ventricle and cause hydrocephalus were the characteristic features of TC in the preoperative MRI study. According to the degree of vertical extension of the tumor, the 34 TCs could be classified into 3 subtypes: type 1, entity was limited to stalk (n = 2, 5.9%); type 2, tumor extended up to the third ventricle (type 2a) or down to the subdiaphragmatic cavity (type 2b) (n = 23, 67.6%); and type 3, tumor extended in both directions (n = 9, 26.5%). For TC resection, the chiasm–pituitary corridor, lamina terminalis corridor, and pituitary corridor could be used separately or jointly. Most of the TCs originated from the infundibulum–tuber cinereum, grew within and along the long axis of the infundibulum, and the pituitary stalk was not usually preserved in TCs (20.6%), whereas the rate of preservation was higher (80.3%) in NCs. Bilateral hypothalamic injury was found in nearly all TCs if radical resection was performed, whereas the relationship between NCs and hypothalamus was either compression (32.8%) or unilateral invasion (67.2%). Meanwhile, the postoperative endocrine and neuropsychological function outcomes in patients with TC were worse than in patients with NC. The genetic analysis with whole-exome sequencing studies showed no differential mutations of CTNNB1 (β-catenin) and BRAF (V600E) between TC and NC subtypes, but there was a difference between adamantinomatous craniopharyngioma and papillary craniopharyngioma.CONCLUSIONSTC is a special subtype of suprasellar craniopharyngioma, which is remarkably different from NC. Identification of this type of tumor preoperatively is essential for the planning of appropriate surgical approach and degree of excision.

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