scholarly journals Reduced renewal of conditioned suppression following lesions of the dorsal hippocampus in male rats.

2020 ◽  
Vol 134 (5) ◽  
pp. 444-459
Author(s):  
Armin Tavakkoli ◽  
Danielle I. Fournier ◽  
David J. Bucci ◽  
Travis P. Todd
Keyword(s):  
Conditioned Suppression ◽  
Dorsal Hippocampus ◽  
Male Rats

scholarly journals Is Hippocampus Susceptible to Antinociceptive Tolerance to NSAIDs Like the Periaqueductal Grey?

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Nana Tsiklauri ◽  
Ivliane Nozadze ◽  
Gulnazi Gurtskaia ◽  
Merab G. Tsagareli
Keyword(s):  
Dorsal Hippocampus ◽  
Antinociceptive Effect ◽  
Male Rats ◽  
Opioid Antagonist ◽  
Tail Flick ◽  
Pain Models ◽  
Inflammatory Drugs ◽  
Antinociceptive Tolerance ◽  
Undesirable Feature

Emotional distress is the most undesirable feature of painful experience. Numerous studies have demonstrated the important role of the limbic system in the affective-motivational component of pain. The purpose of this paper was to examine whether microinjection of nonsteroidal anti-inflammatory drugs (NSAIDs), Clodifen, Ketorolac, and Xefocam, into the dorsal hippocampus (DH) leads to the development of antinociceptive tolerance in male rats. We found that microinjection of these NSAIDs into the DH induces antinociception as revealed by a latency increase in the tail-flick (TF) and hot plate (HP) tests compared to controls treated with saline into the DH. Subsequent tests on consecutive three days, however, showed that the antinociceptive effect of NSAIDs progressively decreased, suggesting tolerance developed to this effect of NSAIDs. Both pretreatment and posttreatment with the opioid antagonist naloxone into the DH significantly reduced the antinociceptive effect of NSAIDs in both pain models. Our data indicate that microinjection of NSAIDs into the DH induces antinociception which is mediated via the opioid system and exhibits tolerance.

scholarly journals Two strategies used to solve a navigation task: A different use of the hippocampus by males and females? A preliminary study in rats

2018 ◽  
Vol 39 (2) ◽  
pp. 319-339 ◽  
Author(s):  
Ferran Lugo ◽  
Marta N. Torres ◽  
V.D. Chamizo
Keyword(s):  
Dorsal Hippocampus ◽  
Female Rats ◽  
Male Rats ◽  
Males And Females ◽  
Preliminary Study ◽  
Types Of Information ◽  
Landmark Learning ◽  
Source Of Information ◽  
Geometry Learning

AbstractThere is abundant research (both in rodents and in humans) showing that males and females often use different types of information in spatial navigation. Males prefer geometry as a source of information, whereas females tend to focus on landmarks (which are often near to a goal objects). However, when considering the role of the hippocampus, the research focuses primarily on males only. In the present study, based on Rodríguez, Torres, Mackintosh, and Chamizo’s (2010, Experiment 2) navigation protocol, we conducted two experiments, one with males and another with females, in order to tentatively evaluate the role of the dorsal hippocampus in the acquisition of two tasks: one based on landmark learning and the alternate one on local pool-geometry learning. Both when landmark learning and when geometry learning, Sham male rats learned significantly faster than Lesion male animals. This was not the case with female rats in geometry learning. These results suggest that the dorsal hippocampus could play an important role in males only.

scholarly journals An Advanced Transcriptional Response to Corticosterone After Single Prolonged Stress in Male Rats

2021 ◽  
Vol 15 ◽  
Author(s):  
Jinlan Ding ◽  
Xinzhao Chen ◽  
Fang Han ◽  
Onno C. Meijer
Keyword(s):  
Negative Feedback ◽  
Target Genes ◽  
Dorsal Hippocampus ◽  
Rapid Change ◽  
Plasma Corticosterone ◽  
Male Rats ◽  
Post Traumatic Stress ◽  
Transcriptional Responses ◽  
Single Prolonged Stress ◽  
Prolonged Stress

Stress-related neuropsychiatric disorders are often accompanied by dysfunction of the hypothalamic-pituitary-adrenal (HPA) axis. In patients suffering from post-traumatic stress disorder (PTSD), increased sensitivity of glucocorticoid negative feedback has regularly been observed. The single prolonged stress (SPS) paradigm was developed to model increased negative feedback and other aspects of PTSD in rats. In this study, we used a setup that precluded the evaluation of negative feedback but rather served to test the hypothesis of the enhanced glucocorticoid receptor (GR) signaling in higher brain areas. We injected corticosterone or vehicle 7 days after SPS and evaluated plasma corticosterone, as well as gene expression in the dorsal hippocampus and amygdala. We observed a strikingly rapid change in the expression of established GR target genes (t = 30 min) only in the SPS group on exogenous corticosterone injection. Our results extend the notion of increased GR sensitivity in PTSD to include transcriptional responses in the hippocampus.

The effect of morphine sensitization on extracellular concentrations of GABA in dorsal hippocampus of male rats

2011 ◽  
Vol 669 (1-3) ◽  
pp. 66-70 ◽  
Author(s):  
Maryam Farahmandfar ◽  
Mohammad-Reza Zarrindast ◽  
Mehdi Kadivar ◽  
Seyed Morteza Karimian ◽  
Nasser Naghdi
Keyword(s):  
Dorsal Hippocampus ◽  
Male Rats

scholarly journals Regulation of CREB Phosphorylation in Nucleus Accumbens after Relief Conditioning

Cells ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 238
Author(s):  
Elaheh Soleimanpour ◽  
Jorge R. Bergado Acosta ◽  
Peter Landgraf ◽  
Dana Mayer ◽  
Evelyn Dankert ◽  
...  
Keyword(s):  
Nucleus Accumbens ◽  
Dorsal Hippocampus ◽  
Dorsal Striatum ◽  
Brain Regions ◽  
D1 Receptor ◽  
Male Rats ◽  
Molecular Pathways ◽  
Western Blots ◽  
Creb Phosphorylation ◽  
Aversive Events

Relief learning is the association of environmental cues with the cessation of aversive events. While there is increasing knowledge about the neural circuitry mediating relief learning, the respective molecular pathways are not known. Therefore, the aim of the present study was to examine different putative molecular pathways underlying relief learning. To this purpose, male rats were subjected either to relief conditioning or to a pseudo conditioning procedure. Forty-five minutes or 6 h after conditioning, samples of five different brain regions, namely the prefrontal cortex, nucleus accumbens (NAC), dorsal striatum, dorsal hippocampus, and amygdala, were collected. Using quantitative Western blots, the expression level of CREB, pCREB, ERK1/2, pERK1/2, CaMKIIα, MAP2K, PKA, pPKA, Akt, pAkt, DARPP-32, pDARPP-32, 14-3-3, and neuroligin2 were studied. Our analyses revealed that relief conditioned rats had higher CREB phosphorylation in NAC 6 h after conditioning than pseudo conditioned rats. The data further revealed that this CREB phosphorylation was mainly induced by dopamine D1 receptor-mediated activation of PKA, however, other kinases, downstream of the NMDA receptor, may also contribute. Taken together, the present study suggests that CREB phosphorylation, induced by a combination of different molecular pathways downstream of dopamine D1 and NMDA receptors, is essential for the acquisition and consolidation of relief learning.

scholarly journals Maternal stress programs a demasculinization of glutamatergic transmission in stress-related brain regions of aged rats

GeroScience ◽  
2021 ◽  
Author(s):  
Remy Verhaeghe ◽  
Vance Gao ◽  
Sara Morley-Fletcher ◽  
Hammou Bouwalerh ◽  
Gilles Van Camp ◽  
...  
Keyword(s):  
Prefrontal Cortex ◽  
Risk Taking ◽  
Exploratory Behavior ◽  
Brain Aging ◽  
Dorsal Hippocampus ◽  
Ventral Hippocampus ◽  
Male Rats ◽  
Aged Rats ◽  
Males And Females ◽  
Risk Taking Behavior

AbstractBrain aging may be programmed by early-life stress. Aging affects males and females differently, but how perinatal stress (PRS) affects brain aging between sexes is unknown. We showed behavioral and neurobiological sex differences in non-stressed control rats that were strongly reduced or inverted in PRS rats. In particular, PRS decreased risk-taking behavior, spatial memory, exploratory behavior, and fine motor behavior in male aged rats. In contrast, female aged PRS rats displayed only increased risk-taking behavior and reduced exploratory behavior. PRS induced large reductions in the expression of glutamate receptors in the ventral and dorsal hippocampus and prefrontal cortex only in male rats. PRS also reduced the expression of synaptic vesicle-associated proteins, glucocorticoid receptors (GR), and mineralocorticoid receptors (MR) in the ventral hippocampus of aged male rats. In contrast, in female aged rats, PRS enhanced the expression of MRs and brain-derived neurotrophic factor (BDNF) in the ventral hippocampus and the expression of glial fibrillary acidic protein (GFAP) and BDNF in the prefrontal cortex. A common PRS effect in both sexes was a reduction in exploratory behavior and metabotropic glutamate (mGlu2/3) receptors in the ventral hippocampus and prefrontal cortex. A multidimensional analysis revealed that PRS induced a demasculinization profile in glutamate-related proteins in the ventral and dorsal hippocampus and prefrontal cortex, as well as a demasculinization profile of stress markers only in the dorsal hippocampus. In contrast, defeminization was observed only in the ventral hippocampus. Measurements of testosterone and 17-β-estradiol in the plasma and aromatase in the dorsal hippocampus were consistent with a demasculinizing action of PRS. These findings confirm that the brains of males and females differentially respond to PRS and aging suggesting that females might be more protected against early stress and age-related inflammation and neurodegeneration. Taken together, these results may contribute to understanding how early environmental factors shape vulnerability to brain aging in both sexes and may lay the groundwork for future studies aimed at identifying new treatment strategies to improve the quality of life of older individuals, which is of particular interest given that there is a high growth of aging in populations around the world.

Imipramine attenuates anxiety- and depressive-like effects of acute and prolonged ethanol-abstinence in male rats by modulating SERT and GR expression in the dorsal hippocampus

2021 ◽  
pp. 113295
Author(s):  
Rodrigo Campos-Cardoso ◽  
Carla P.B. Silva ◽  
Ruither O.G. Carolino ◽  
Janete A. Anselmo-Franci ◽  
Carlos R. Tirapelli ◽  
...  
Keyword(s):  
Dorsal Hippocampus ◽  
Male Rats
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