The course of paraventricular hypothalamic efferents to autonomic structures in medulla and spinal cord

Luiten, P.G.M.; Horst, ter Gert; Karst, H.; Steffens, A.B.

doi:10.1016/0006-8993(85)90554-2

Cited by 464 publications

(218 citation statements)

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“…15,16 Afferent projections from Ucn2-expressing nuclei to the DRN were shown in studies using both anterograde and retrograde tracers. [31][32][33][34] Thus, the expression of Ucn2 in known anatomical projections to the DRN suggests a possible role for Ucn2 in the functioning of 5-HT neurons during stress. Interestingly, detailed anatomical studies showed that Ucn3-expressing neurons do not innervate CRFR2-DRN neurons, 35 suggesting Ucn1 and Ucn2 as the endogenous ligands for CRFR2 activation in DRN neurons.…”

Section: Introductionmentioning

confidence: 98%

Urocortin-1 and -2 double-deficient mice show robust anxiolytic phenotype and modified serotonergic activity in anxiety circuits

et al. 2009

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The urocortin (Ucn) family of neuropeptides is suggested to be involved in homeostatic coping mechanisms of the central stress response through the activation of corticotropin-releasing factor receptor type 2 (CRFR2). The neuropeptides, Ucn1 and Ucn2, serve as endogenous ligands for the CRFR2, which is highly expressed by the dorsal raphe serotonergic neurons and is suggested to be involved in regulating major component of the central stress response. Here, we describe genetically modified mice in which both Ucn1 and Ucn2 are developmentally deleted. The double knockout mice showed a robust anxiolytic phenotype and altered hypothalamic-pituitary-adrenal axis activity compared with wild-type mice. The significant reduction in anxiety-like behavior observed in these mice was further enhanced after exposure to acute stress, and was correlated with the levels of serotonin and 5-hydroxyindoleacetic acid measured in brain regions associated with anxiety circuits. Thus, we propose that the Ucn/ CRFR2 serotonergic system has an important role in regulating homeostatic equilibrium under challenge conditions.

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Section: Introductionmentioning

confidence: 98%

Urocortin-1 and -2 double-deficient mice show robust anxiolytic phenotype and modified serotonergic activity in anxiety circuits

et al. 2009

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“…The rostral regions of the PVN contain the neuroendocrine CRH neurons, that is, the neurons that project to the median eminence and control the secretion of ACTH (Swanson and Sawchenko, 1983). The CRH neurons that project to other areas of the brain, particularly to the midbrain and periaquaductal gray regions, are present in the caudal twothirds of the PVN (Luiten et al, 1985;Portillo et al, 1998). Together, this information suggests that E7P can impact the function of the CRH neurons that control the HPA axis.…”

Section: Discussionmentioning

confidence: 95%

Ovarian Steroid Treatment Decreases Corticotropin-Releasing Hormone (CRH) mRNA and Protein in the Hypothalamic Paraventricular Nucleus of Ovariectomized Monkeys

Bethea

Centeno

2007

Neuropsychopharmacol

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Corticotropin-releasing hormone (CRH) gene and protein expression were examined in the paraventricular nucleus (PVN) of ovariectomized female macaques treated with placebo or hormone therapy (HT) consisting of either estrogen (E) for 28 days, or progesterone (P) for the last 14 of 28 days, or E for 28 days supplemented with P for the last 14 of 28 days using Silastic capsules implanted s.c. in the periscapular region (n ¼ 4/group). Perfusion fixed sections (25 mm) at five levels of the PVN (rostral to caudal at 250 mm intervals) were immunostained (ICC) with an antibody to human CRH or processed in an in situ hybridization (ISH) assay with a monkey specific CRH riboprobe. The immunostained CRH-positive area was quantified with a Marianas Stereology Workstation and Slidebook 4.2. There was a significant decrease in the immunological CRH signal with E, P, and E + P treatment as measured by total or average pixels and microns (analysis of variance (ANOVA), po0.002; Student-Newman-Keul's post hoc test versus placebo control group, po0.05). There was also a decrease in the number of detectable CRH neurons (ANOVA, po0.03) with HT. The sections processed for ISH were exposed to autoradiographic films. The CRH mRNA signal was analyzed with NIH Image. The average optical density and positive pixel area of the CRH mRNA signal was significantly suppressed by ovarian HT (ANOVA po0.002; StudentNewman-Keul's post hoc test versus placebo control group, po0.05). In summary, 1 month of stable treatment with a moderate dose of E, P or E + P significantly reduced CRH mRNA and protein in the PVN of ovariectomized monkeys. These results suggest that this hormone treatment regimen may increase stress resilience in surgically menopausal primates.

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“…Together, available evidence indicates that ANG II is a likely neurotransmitter released from SFO terminals within the PVN (22,41). Furthermore, parvocellular neurons of the PVN project to regions of the CNS that control sympathetic outflow (36), including the rostral ventrolateral medulla, the dorsomedial medulla, and the spinal intermediolateral cell column (26,36,39). Numerous studies support the concept that neuronal projections from autonomic neurons in the PVN can modulate the activity of sympathetic nerves (27,28).…”

Section: Discussionmentioning

confidence: 96%

Chronic angiotensin II infusion attenuates the renal sympathoinhibitory response to acute volume expansion

LaGrange

Toney

Bishop

2003

American Journal of Physiology-Regulatory, Integrative and Comp

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In this study the hypothesis was tested that chronic infusion of ANG II attenuates acute volume expansion (VE)-induced inhibition of renal sympathetic nerve activity (SNA). Rats received intravenous infusion of either vehicle or ANG II (12 ng·kg −1 ·min −1 ) for 7 days. ANG II-infused animals displayed an increased contribution of SNA to the maintenance of mean arterial pressure (MAP) as indicated by ganglionic blockade, which produced a significantly (P < 0.01) greater decrease in MAP (75 ± 3 mmHg) than was observed in vehicle-infused (47 ± 8 mmHg) controls. Rats were then anesthetized, and changes in MAP, mean right atrial pressure (MRAP), heart rate (HR), and renal SNA were recorded in response to right atrial infusion of isotonic saline (20% estimated blood volume in 5 min). Baseline MAP, HR, and hematocrit were not different between groups. Likewise, MAP was unchanged by acute VE in vehicle-infused animals, whereas VE induced a significant bradycardia (P < 0.05) and increase in MRAP (P < 0.05). MAP, MRAP, and HR responses to VE were not statistically different between animals infused with vehicle vs. ANG II. In contrast, VE significantly (P < 0.001) reduced renal SNA by 33.5 ± 8% in vehicle-infused animals but was without effect on renal SNA in those infused chronically with ANG II. Acutely administered losartan (3 mg/kg iv) restored VEinduced inhibition of renal SNA (P < 0.001) in rats chronically infused with ANG II. In contrast, this treatment had no effect in the vehicle-infused group. Therefore, it appears that chronic infusion of ANG II can attenuate VE-induced renal sympathoinhibition through a mechanism requiring AT 1 receptor activation. The attenuated sympathoinhibitory response to VE in ANG II-infused animals remained after arterial barodenervation and systemic vasopressin V 1 receptor antagonism and appeared to depend on ANG II being chronically increased because ANG II given acutely had no effect on VE-induced renal sympathoinhibition. Keywordssympathetic nerve activity; cardiopulmonary reflex; body fluid balance; arterial baroreceptor reflex Numerous studies have investigated interactions between circulating ANG II and the arterial baroreceptor reflex. Whereas recent studies indicate that an acute increase in circulating ANG II can attenuate the increase in sympathetic nerve activity (SNA) that follows arterial baroreceptor unloading (34), chronic increases of ANG II have been repeatedly demonstrated to reset arterial baroreflex control of SNA (4, 6). The latter effect may permit SNA to rise relative to the prevailing level of arterial pressure. In addition to the arterial Copyright © 2003 NIH-PA Author ManuscriptNIH-PA Author Manuscript NIH-PA Author Manuscript baroreflex, the cardiopulmonary baroreflex is also an important determinant of sympathetic outflow as well as sodium and water balance. However, the extent to which chronic increases of ANG II might interact with this reflex to modify the SNA response to volume expansion (VE) is not known. This is surprising given that norma...

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The course of paraventricular hypothalamic efferents to autonomic structures in medulla and spinal cord

Cited by 464 publications

References 16 publications

Urocortin-1 and -2 double-deficient mice show robust anxiolytic phenotype and modified serotonergic activity in anxiety circuits

Urocortin-1 and -2 double-deficient mice show robust anxiolytic phenotype and modified serotonergic activity in anxiety circuits

Ovarian Steroid Treatment Decreases Corticotropin-Releasing Hormone (CRH) mRNA and Protein in the Hypothalamic Paraventricular Nucleus of Ovariectomized Monkeys

Chronic angiotensin II infusion attenuates the renal sympathoinhibitory response to acute volume expansion

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