Labile State Research Articles

Shifts in evolutionary lability underlie independent gains and losses of root-nodule symbiosis in a single clade of plants

Root nodule symbiosis (RNS) is a complex trait that enables plants to access atmospheric nitrogen converted into usable forms through a mutualistic relationship with soil bacteria. Pinpointing the evolutionary origins of RNS is critical for understanding its genetic basis, but building this evolutionary context is complicated by data limitations and the intermittent presence of RNS in a single clade of ca. 30,000 species of flowering plants, i.e., the nitrogen-fixing clade (NFC). We developed the most extensive de novo phylogeny for the NFC and an RNS trait database to reconstruct the evolution of RNS. Our analysis identifies evolutionary rate heterogeneity associated with a two-step process: An ancestral precursor state transitioned to a more labile state from which RNS was rapidly gained at multiple points in the NFC. We illustrate how a two-step process could explain multiple independent gains and losses of RNS, contrary to recent hypotheses suggesting one gain and numerous losses, and suggest a broader phylogenetic and genetic scope may be required for genome-phenome mapping.

Driving factors for distribution and transformation of heavy metals speciation in a zinc smelting site

Heavy metal pollution at an abandoned smelter pose a significant risk to environmental health. However, remediation strategies are constrained by inadequate knowledge of the polymetallic distribution, speciation patterns, and transformation factors at these sites. This study investigates the influence of soil minerals, heavy metal occurrence forms, and environmental factors on heavy metal migration behaviors and speciation transformations. X-ray diffraction analysis revealed that the minerals associated with heavy metals are mainly hematite, franklinite, sphalerite, and galena. Sequential extraction results suggest that lead and zinc are primarily present in the organic-sulfide fractions (F4) and residual form (F5) in the soil, accounting for over 70% of the total heavy metal content. Zinc displayed greater instability in carbonate-bound (16%) and exchangeable (2%) forms. The migration and diffusion patterns of heavy metals in the subsurface environment were visualized through the simulation of labile state heavy metals, demonstrating high congruence with groundwater pollution distribution patterns. The key environmental factors influencing heavy metal stable states (F4 and F5) were assessed by integrating random forest models and redundancy analysis. Primary factors facilitating Pb transformation into stable states were available phosphorus, clay content, depth, and soil organic matter. For Zn, the principal drivers were Mn oxides, soil organic matter, clay content, and inorganic sulfur ions. These findings enhance understanding of the distribution and transformation of heavy metal speciation and can provide valuable insights into controlling heavy metal pollution at non-ferrous smelting sites.

Exploration of selective copper ion separation from wastewater via capacitive deionization with highly effective 3D carbon framework-anchored Co(PO3)2 electrode

The increasing amount of heavy metal copper ions (Cu2+) in industrial emissions, poses a serious threat to human health, biological environment, and resource scarcity. Capacitive deionization (CDI) is considered as a green and efficient method for desalination. It is crucial to develop high-performance electrodes for efficient operation of CDI that go beyond conventional carbon and yield considerable environmental benefits. Here, metal organic frameworks (MOFs) derived carbon-loaded cobalt metaphosphate (NC-Co(PO3)2) was prepared by low-temperature gas–solid phosphating for Cu2+ removal as CDI electrode for the first time. NC-Co(PO3)2 demonstrated superior electrode structure and function due to the synergistic effects of electric double layer coupling P-O bonds, the binding tendency of metaphosphate groups with Cu2+, and interfacial redox reactions induced by the labile valence state of cobalt. The optimal electrosorption capacity of NC-Co(PO3)2 was 95.41 mg g−1 at 1 V in 50 mL Cu2+ solution with splendid cyclic regeneration capability. Moreover, NC-Co(PO3)2 exhibited excellent selectivity and outstanding electrosorption performance in the presence of multiple coexisting ions and this CDI system realized the purification of actual copper-containing wastewater. A series of characterizations further revealed the specific mechanism of Cu2+ in adsorption–desorption process. Our finding strongly supported NC-Co(PO3)2 electrode can extend the CDI platform's capability for effectively removing and retrieving Cu2+ from wastewater.

Activating M1 muscarinic cholinergic receptors induces destabilization of resistant contextual fear memories in rats

Destabilization of previously consolidated memories places them in a labile state in which they are open to modification. However, strongly encoded fear memories tend to be destabilization-resistant and the conditions required to destabilize such memories remain poorly understood. Our lab has previously shown that exposure to salient novel contextual cues during memory reactivation can destabilize strongly encoded object location memories and that activity at muscarinic cholinergic receptors is critical for this effect. In the current study, we similarly targeted destabilization-resistant fear memories, hypothesizing that exposure to salient novelty at the time of reactivation would induce destabilization of strongly encoded fear memories in a muscarinic receptor-dependent manner. First, we show that contextual fear memories induced by 3 context-shock pairings readily destabilize upon memory reactivation, and that this destabilization is blocked by systemic (ip) administration of the muscarinic receptor antagonist scopolamine (0.3 mg/kg) in male rats. Following that, we confirm that this effect is dorsal hippocampus (dHPC)-dependent by targeting M1 receptors in the CA1 region with pirenzepine. Next, we show that more strongly encoded fear memories (induced with 5 context-shock pairings) resist destabilization. Consistent with our previous work, however, we report that salient novelty (a change in floor texture) presented during the reactivation session promotes destabilization of resistant contextual fear memories in a muscarinic receptor-dependent manner. Finally, the effect of salient novelty on memory destabilization was mimicked by stimulating muscarinic receptors with the selective M1 agonist CDD-0102A (ip, 0.3 mg/kg). These findings reveal further generalizability of our previous results implicating novel cues and M1 muscarinic signaling in promoting destabilization of resistant memories and suggest possible therapeutic options for disorders characterized by persistent, maladaptive fear memories such as PTSD and phobias.

Evolutionarily divergent mTOR remodels translatome for tissue regeneration.

An outstanding mystery in biology is why some species, such as the axolotl, can regenerate tissues whereas mammals cannot1. Here, we demonstrate that rapid activation of protein synthesis is a unique feature of the injury response critical for limb regeneration in the axolotl (Ambystoma mexicanum). By applying polysome sequencing, we identify hundreds of transcripts, including antioxidants and ribosome components that are selectively activated at the level of translation from pre-existing messenger RNAs in response to injury. By contrast, protein synthesis is not activated in response to non-regenerative digit amputation in the mouse. We identify the mTORC1 pathway as a key upstream signal that mediates tissue regeneration and translational control in the axolotl. We discover unique expansions in mTOR protein sequence among urodele amphibians. By engineering an axolotl mTOR (axmTOR) in human cells, we show that these changes create a hypersensitive kinase that allows axolotls to maintain this pathway in a highly labile state primed for rapid activation. This change renders axolotl mTOR more sensitive to nutrient sensing, and inhibition of amino acid transport is sufficient to inhibit tissue regeneration. Together, these findings highlight the unanticipated impact of the translatome on orchestrating the early steps of wound healing in ahighly regenerative species and provide a missing link in our understanding of vertebrate regenerative potential.

Role of Hippocampal Wnt Signaling Pathways on Contextual Fear Memory Reconsolidation

Memories already consolidated when reactivated return to a labile state and can be modified, this process is known as reconsolidation. It is known the Wnt signaling pathways can modulate hippocampal synaptic plasticity as well as learning and memory. Yet, Wnt signaling pathways interact with NMDA (N-methyl-D-aspartate) receptors. However, whether canonical Wnt/β-catenin and non-canonical Wnt/Ca2 + signaling pathways are required in the CA1 region of hippocampus for contextual fear memory reconsolidation remains unclear. So, here we verified that the inhibition of canonical Wnt/β-catenin pathway with DKK1 (Dickkopf-1) into CA1 impaired the reconsolidation of contextual fear conditioning (CFC) memory when administered immediately and 2 h after reactivation session but not 6 h later, while the inhibition of non-canonical Wnt/Ca2+ signaling pathway with SFRP1 (Secreted frizzled-related protein-1) into CA1 immediately after reactivation session had no effect. Moreover, the impairment induced by DKK1 was blocked by the administration of the agonist of the NMDA receptors glycine site, D-Serine, immediately and 2 h after reactivation session. We found that hippocampal canonical Wnt/β-catenin is necessary to the reconsolidation of CFC memory at least two hours after reactivation, while non-canonical Wnt/Ca2+ signaling pathway is not involved in this process and, that there is a link between Wnt/β-catenin signaling pathway and NMDA receptors. In view of this, this study provides new evidence regarding the neural mechanisms underlying contextual fear memory reconsolidation and contributes to provide a new possible target for the treatment of fear related disorders.

Long term structural and functional neural changes following a single infusion of Ketamine in PTSD

NMDA receptor antagonists have a vital role in extinction, learning, and reconsolidation processes. During the reconsolidation window, memories are activated into a labile state and can be reconsolidated in an altered form. This concept might have significant clinical implications in treating PTSD. In this pilot study we tested the potential of a single infusion of ketamine, followed by brief exposure therapy, to enhance post-retrieval extinction of PTSD trauma memories. 27 individuals diagnosed with PTSD were randomly assigned to receive either ketamine (0.5 mg/kg 40 min; N = 14) or midazolam (0.045 mg/kg; N = 13) after retrieval of the traumatic memory. 24 h following infusion, participants received a four-day trauma-focused psychotherapy. Symptoms and brain activity were assessed before treatment, at the end of treatment, and at 30-day follow-up. Amygdala activation to trauma scripts (a major biomarker of fear response) served as the main study outcome. Although PTSD symptoms improved equally in both groups, post-treatment, ketamine recipients showed a lower amygdala (−0.33, sd = 0.13, 95%HDI [−0.56,−0.04]) and hippocampus (−0.3 (sd = 0.19), 95%HDI [−0.65, 0.04]; marginal effect) reactivation to trauma memories, compared to midazolam recipients. Post-retrieval ketamine administration was also associated with decreased connectivity between the amygdala and hippocampus (−0.28, sd = 0.11, 95%HDI [−0.46, −0.11]), with no change in amygdala-vmPFC connectivity. Moreover, reduction in fractional anisotropy in bi-lateral uncinate fasciculus was seen in the Ketamine recipients compared with the midazolam recipients (right: post-treatment: −0.01108, 95% HDI [−0.0184,−0.003]; follow-up: −0.0183, 95% HDI [−0.02719,−0.0107]; left: post-treatment: −0.019, 95% HDI [−0.028,−0.011]; follow-up: −0.017, 95% HDI [−0.026,−0.007]). Taken together it is possible that ketamine may enhance post-retrieval extinction of the original trauma memories in humans. These preliminary findings show promising direction toward the capacity to rewrite human traumatic memories and modulate the fear response for at least 30 days post-extinction. When combined with psychotherapy for PTSD, further investigation of ketamine dose, timing of administration, and frequency of administration, is warranted.

Uncommon Events of Fall and Mood Changes Observed in Post-COVID-19 Patients: A Case Series

Coronavirus disease 2019 (COVID-19) infection in some patients has been documented to cause acute central nervous system (CNS) affection, or CNS depression, even in the absence of demonstrable hypoxia. These observations indicate that there may be some direct effect of the virus on CNS. In this case series of cured post-COVID-19 cases, mood changes like elation, depression, and emotionally labile state have been reported in three previously healthy individuals. The mood changes are waning very slowly in them with the passage of time. All of them also sustained fall sometime following acute COVID-19. Fall is considered to be an event indicating frailty and old age, and there is no mood change associated with fall in that population. Here, the three cases are being reported because neither fall nor mood changes during post-COVID-19 phase have been reported as yet to the best of our knowledge. The case series is worth reporting to generate awareness about the matter in the scientific community and also to indicate that further research in this field is required either to accept or to reject any correlation between COVID-19 infection and fall or mood change in otherwise healthy individuals, which can even be due to some direct effect of the virus on CNS.

Oxygen Vacancy Introduction to Increase the Capacity and Voltage Retention in Li‐Excess Cathode Materials

Li‐rich rocksalt oxides are promising cathode materials for lithium‐ion batteries due to their large capacity and energy density, and their ability to use earth‐abundant elements. The excess Li in the rocksalt, needed to achieve good Li transport, reduces the theoretical transition metal redox capacity and introduces a labile oxygen state, both of which lead to increased oxygen oxidation and concomitant capacity loss with cycling. Herein, it is demonstrated that substituting the labile oxygen in Li‐rich cation‐disordered rocksalt materials with a vacancy is an effective strategy to inhibit oxygen oxidation. It is found that the oxygen vacancy in cation‐disordered lithium manganese oxide favors high Li coordination thereby reducing the concentration of unhybridized oxygen states, while increasing the theoretical Mn capacity. It is shown that in the vacancy‐containing compound, synthesized by ball milling, the Mn valence is lowered to less than +3, providing access to more than 300 mAh g−1 capacity from the Mn2+/Mn4+ redox reservoir. The increased transition metal redox and decreased O oxidation are found to improve the capacity and voltage retention, indicating that oxygen vacancy creation to remove the most vulnerable oxygen ions and reduce transition metal valence provides a new opportunity for the design of high‐performance Li‐rich rocksalt cathodes.

Re-exposures in the Dark Cycle Promote Attenuation of Fear Memory: Role of the Circadian Cycle and Glucocorticoids

It has been shown that a previously consolidated memory can incorporate either new external information or a novel internal emotional state following a labile state induced by retrieval. This updating process allows editing unwanted fear memory, leading to the reduction of the fear response. Memory can be modulated by the circadian cycle. Considering that rodents are more active during the night, expressing less fearful behavior, we investigated whether fear memory can be updated when reactivated during the dark cycle. We found that rats expressed lower freezing levels during a single retrieval session in the dark cycle, but not in the test. However, three retrieval sessions in the dark cycle were able to update fear memory, reducing freezing response in the test performed in the light cycle. This effect was blocked when the glucocorticoid synthesis inhibitor metyrapone was administered before retrieval. This approach opens new avenues to explore interventions that consider the circadian cycle in the treatment of fear memories based on non-pharmacological interventions.

Behavioural reconsolidation interference not observed in a within-subjects design

Studies of reconsolidation interference posit that reactivation of a previously consolidated memory via a reminder brings it into an active, labile state, leaving it open for potential manipulation. If interfered with, this may disrupt the original memory trace. While evidence for pharmacological reconsolidation interference is widespread, it remains unclear whether behavioural interference using the presentation of competing information can engender it, especially in declarative memory. Almost all previous studies in this area have employed between-subjects designs, in which there are potential confounds, such as different retrieval strategies for the multiple conditions. In the current studies, within-subjects paradigms were applied to test the effects of reconsolidation interference on associative recognition and free recall. In Experiment 1, participants engaged in pair-associate learning of unrelated object pictures on Day 1, and after a reminder, interference, reminder + interference, or no manipulation (control) on Day 2, were tested on associative recognition of these pairs on Day 3. In Experiments 2 and 3, memoranda were short stories studied on Day 1. On Day 2, stories were assigned to either control, reminder, interference by alternative stories, or reminder + interference conditions. On Day 3 participants recalled the Day 1 stories, and answered yes/no recognition questions. Reminders improved subsequent memory, while interference was effective in reducing retrieval in differing degrees across the experiments. Importantly, the reminder + interference condition was no more effective in impairing retrieval than the interference-alone condition, contrary to the prediction of the behavioural reconsolidation-interference approach.

Hafızanın Rekonsolidasyon Süreci ve Serbest Çağrışım Tekniği Arasındaki İlişki Üzerine Nöropsikanalitik Bir İnceleme

Klasik koşullanma işleminin sonucunda, en başta nötr olan ve kişinin kendisinde herhangi bir tepki yaratmayan bir uyaranın koşulsuz bir uyaranla eşlenmesiyle, bu uyarana koşullu bir tepki verilmesi sağlanır. Bu sürecin geri çevrilmesi için ise söndürme işleminin uygulanması gerekmektedir. Fakat söndürme işleminin sonucunda ortaya birtakım problemler çıkabilmektedir. Bu problemler koşullu tepkinin yenilenmesi (renewal), eski durumuna dönmesi (reinstatement) ve kendiliğinden geri gelmesi (spontaneous recovery) olarak özetlenebilir. Hafızanın rekonsolidasyonu yaklaşımının ise bu problemlere bir çözüm sunduğu görülmüştür. Şöyle ki hafızanın bir kereye mahsus olarak depolandıktan sonra hayatına sabit ve kararlı bir yapıda devam etmesinden ziyade, her yeniden aktive oluşu (reactivation) ile yeniden kararsız hale geldiği ve sonrasında protein sentezleri ile birlikte tekrardan kararlı bir yapıya büründüğü öne sürülmektedir. Bu kararsız hale gelinen aşamada yapılan müdahalelerin ise orijinal hafızada değişikliğe sebep olabileceği ve böylece de klasik söndürme işleminin yol açtığı problemlere bir çözüm sunabileceği gösterilmektedir. Bu derlemede, psikanalizin temel yöntemlerinden olan serbest çağrışım tekniğinin, yukarıda bahsedilen hafızanın yeniden aktive oluşu ve kararsız hale gelişi durumlarını sağlayıp sağlayamayacağı ve bu sayede orijinal hafızada değişikliklere sebep olup olamayacağı nöropsikanalitik alanyazın ışığında incelenmektedir.

Non-linear susceptibility to interferences in declarative memory formation.

After encoding, memories go through a labile state followed by a stabilization process known as consolidation. Once consolidated they can enter a new labile state after the presentation of a reminder of the original memory, followed by a period of re-stabilization (reconsolidation). During these periods of lability the memory traces can be modified. Currently, some studies show a rapid stabilization after 30 min, while others show that stabilization occurs after longer periods (e.g. > 6 h). Here we investigate the effect of an interference treatment on declarative memory consolidation, comparing distinct time intervals after acquisition. On day 1, participants learned a list of non- syllable pairs (List 1). 5 min, 30 min, 3 h or 8 h later, they received an interference list (List 2) that acted as an amnesic agent. On day 2 (48 h after training) participants had to recall List 1 first, followed by List 2. We found that the List 1 memory was susceptible to interference when List 2 was administered 5 min or 3 h after learning but not when it was administered 30 min or 8 h after. We propose the possibility that this rapid memory protection could be induced by a fast and transient neocortical integration. Our results open a discussion about the contribution of molecular and systemic aspects to memory consolidation.

Sleep enhances reconsolidation-based strengthening of visuospatial memories

Consolidated memories can be returned to a labile state upon reactivation. The re-stabilization of reactivated memories, or reconsolidation, can allow for change in previously established memories. Given the role of sleep in the initial consolidation of memories, sleep may be important for reconsolidation as well. However, effects of sleep on reconsolidation and specific aspects of sleep that may contribute are unclear. Here, participants learned 30 picture-location pairs. After overnight sleep, initial consolidation was tested. Following either one day (Experiment 1) or one week (Experiment 2), participants were tested again to reactivate their memory and then learned 30 novel picture-location pairs. Control groups (Experiment 1) received no reactivation prior to new learning. Twelve hours later, after daytime wakefulness or overnight sleep, participants completed a final memory test. Sleep participants underwent polysomnography between reactivation and final tests. In Experiment 1, reactivation led to preservation of memory compared to no reactivation. Sleep was associated with less post-reactivation memory decline than waking, with memory preservation positively related to time spent in non-rapid-eye movement sleep. In Experiment 2, sleep was associated with greater post-reactivation memory improvement than waking, with improvement positively related to sigma activity. These results suggest sleep enhances reconsolidation-based strengthening of episodic memories.

The interplay of maternal sensitivity and infant temperament and attention in predicting toddlers’ executive function: A two-year longitudinal study

<p id="p00005">Executive Function (EF), proven to be linked to the prefrontal cortex, refers to a set of higher-order cognitive and self-regulatory processes. These processes include (a) inhibition, the ability to intentionally suppress prepotent impulses or habits; (b) working memory, the ability to hold multiple things in the mind at once while mentally manipulating one or more of them; and (c) cognitive flexibility or shifting, the capability to switch between tasks. However, little attention has been given to predictors of EF across the first two years of life. A principal limitation of this is a methodological challenge, due to toddlers’ limited sustained attention, poor language competence, and labile emotional state. Accordingly, in this study, we aimed to examine developmental intrinsic factors (infant attention and temperament) and the caregiving environment (maternal sensitivity) in infancy as possible predictors of EF in toddlerhood. By estimating specific contributions and interaction effects, we aimed to expand the knowledge on early mechanisms behind the development of EF in toddlerhood from an intrinsic and environmental perspective. <break/>At six months (T1, <italic>n </italic>= 236), infants and mothers visited Center for Child Development for the assessment of maternal sensitivity and infant attention. Mothers completed questionnaires on infant temperament. Maternal sensitivity was evaluated by observing the free, interactive process between mother and children at six months. Infant temperament was assessed by mothers reporting data using the Infant Behavior Questionnaire Revised-Short Form (IBQR-SF), and infant attention was assessed using a Screen Look Duration task at six months. At 24 months (T2, <italic>n</italic> = 191), the children returned to the laboratory with an accompanying parent for an assessment battery of EF tasks, including Multilocation Search, Shape Stroop, Reverse Categorization, and Delay of Gratification tasks. <break/>The results indicated that: (1) Peak look duration could predict working memory task and delay of gratification task performance at 24 months. This provides empirical support for the hierarchical framework of EF development, advocating early attention as a foundation for the development of EF. (2) High levels of maternal sensitivity significantly predicted better EF performance among children with low levels of surgency in infancy. However, there was no link between maternal sensitivity and EF among children with medium to high levels of surgency in infancy. (3) Interaction effects suggested that maternal sensitivity positively predicted EF performance among children with high levels of peak look duration in infancy. However, maternal sensitivity negatively predicted EF performance among children with low levels of peak look duration in infancy. <break/>Overall, our findings indicate the importance of intrinsic and extrinsic factors in the development of EF in toddlers and provide key insights about parenting. For infants with a lower level of surgency or longer peak look duration, maternal sensitivity positively predicted EF performance in toddlerhood. However, for infants with shorter peak look duration, excessive maternal sensitivity may not be desirable.

A reminder before extinction failed to prevent the return of conditioned threat responses irrespective of threat memory intensity in rats.

After retrieval, reactivated memories may destabilize and require restabilization processes to persist, referred to as reconsolidation. The reminder-extinction procedure has been proposed as a behavioral reconsolidation-based intervention to persistently attenuate threat-conditioned memories. After the presentation of a single reminder trial, the conditioned threat memory may enter a labile state, and extinction training during this window can prevent the return of conditioned threat responses. However, findings on this reminder-extinction procedure are mixed and its effectiveness may be subject to boundary conditions, including memory strength. Here, we systematically investigate whether more intense threat memories are less susceptible to disruption through a reminder-extinction procedure. Using a Pavlovian auditory threat conditioning procedure at three different shock intensities, rats acquired conditioned threat responses of variable "strength." Rats subsequently underwent either extinction preceded by a reminder or standard extinction. Although different shock intensities led to different strength threat memories, all groups showed reinstatement of conditioned threat responses irrespective of shock intensity or reminder condition. Hence, regardless of the intensity of the threat memory, the reminder procedure was ineffective in preventing the return of threat responses in rats. We thus find no evidence that threat memory intensity is a potential modulator of the effectiveness of the reminder-extinction procedure. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

Improved nutritional status may promote an “asset protection” reproductive strategy in male rock lizards

AbstractInvesting in the current reproduction requires diverting energy resources from other metabolic functions, which may compromise future reproduction and lifespan. To solve this trade-off, an individual may consider its labile state to decide how much to invest in current reproduction. We tested experimentally whether the “state quality” of male rock lizards influences their reproductive strategies. To improve the nutritional status of males before the mating season, we captured and supplemented experimental males (N = 20) with dietary vitamin D3 (an essential nutrient for lizards) and had a control group of males (N = 20). Then, we released all these males and females (N = 31) in a large semi-natural outdoor enclosure where lizards could interact and mate freely during the mating period. Activity levels of males did not vary between treatments, but supplemented males started fewer intrasexual agonistic interactions and made fewer mating advances to females. When the mating season ended, we incubated eggs laid by females to obtain the offspring and estimated the paternity of males using DNA microsatellites. Supplemented males sired fewer offspring than control males. These results suggest that vitamin D3 supplemented males used a low risk/less costly mating strategy to protect their assets (i.e., vitamin D reserves), but that still resulted in “some” current reproductive success, while likely increasing longevity and the expected future total reproductive success.

STUDY OF THE FEATURES OF THE EMOTIONAL STATE OF ELDERLY WOMEN WITH ISCHEMIC HEART DISEASE

The article highlights the results of an empirical study of the psychological components of the emotional state of elderly women with coronary heart disease (CHD), which covered 135 respondents aged 65 to 75 years with coronary heart disease. The aim of the study was to study the psychological components of emotional states of elderly women that can affect the manifestations and course of coronary heart disease, in particular, alexithymia, anxiety, depression, asthenia. It was found that the components of psycho-emotional states of patients with coronary heart disease consist of a set of psychophysiological factors, including: the specifics of emotionally negative states such as anxiety, depression, asthenia, hostility, etc., and the features of the somatic state, themselves manifestations of coronary heart disease and their concomitant changes in the psycho-emotional sphere, in particular the specifics of the traumatic situation for the patient and her personal characteristics. An empirical study found that elderly women with coronary heart disease are characterized by high levels of anxiety, depression, asthenia, mental stress, irritability, suspicion, resentment, neuroticism, secrecy, emotional lability. It is empirically proven that depending on the gender of an individual with coronary heart disease, the psychological components of emotional states differ significantly. It has been studied that women with coronary heart disease have a high level of lability and unstable emotional state. It is established that the emotional state changes rapidly depending on the factors of external and internal stimuli. A labile emotional state is a sign of danger in a person's psychological state, so it can be critical for women with coronary heart disease. Due to the qualitative processing of the obtained results, we found that in the three formed samples - CG, ECG and ECG, the results of the study differed significantly. In the experimental group of men there are no such psycho-emotional phenomena as negativism, irritation, suspicion, resentment and guilt; neuroticism. The results of the control group revealed a high percentage of women at risk. In the experimental group of women, which is the main goal of our study, the outlined phenomena had the highest rate. A number of emotions that contribute to coronary heart disease were identified: dissatisfaction with work, education, life in general; experiencing creative failures, defeats in ambitious desires; insult; frustration caused by the sharp destruction of the usual stereotype of life; constant feeling of inner tension; lack of satisfaction in achieving success; fear; chronic anxiety. From this list of feelings it is clear that they all belong to the register of negative feelings, those that create emotional discomfort. All these feelings are antipodes of feelings that are traditionally considered attributes of a healthy heart, such as: love, courage, courage, joy. The above conditions are special for people with coronary heart disease and have significant differences between male and female groups, and therefore they can be considered as psychophysiological features of elderly women with coronary heart disease. Prospects for further research may be the feasibility of creating a comprehensive program of psychocorrection of emotional states of elderly women with coronary heart disease.

Enhancing Trauma-Memories Reconsolidation With One-Time Ketamine Infusion

NMDA receptor antagonists were found to have a vital role in extinction and reconsolidation processes. During reconsolidation, memories are activated into a labile state and can be stored in an altered form. This idea might have clinical implications in the treatment of PTSD, with current psychotherapies’ success rate rounding 50%. Here we used a single subanesthetic intravenous infusion of ketamine (NMDA receptor antagonist; 0.5mg/kg over 40min) to enhance post-retrieval extinction of real traumatic memories.

Lack of drug-induced post-retrieval amnesia for auditory fear memories in rats

BackgroundLong-term memory formation is generally assumed to involve the permanent storage of recently acquired memories, making them relatively insensitive to disruption, a process referred to as memory consolidation. However, when retrieved under specific circumstances, consolidated fear memories are thought to return to a labile state, thereby opening a window for modification (e.g., attenuation) of the memory. Several interventions during a critical time frame after this destabilization seem to be able to alter the retrieved memory, for example by pharmacologically interfering with the restabilization process, either by direct protein synthesis inhibition or indirectly, using drugs that can be safely administered in patients (e.g., propranolol). Here, we find that, contrary to expectations, systemic pharmacological manipulations in auditory fear-conditioned rats do not lead to drug-induced post-retrieval amnesia.ResultsIn a series of well-powered auditory fear conditioning experiments (four with propranolol, 10 mg/kg, two with rapamycin, 20–40 mg/kg, one with anisomycin, 150 mg/kg and cycloheximide, 1.5 mg/kg), we found no evidence for reduced cued fear memory expression during a drug-free test in adult male Sprague-Dawley rats that had previously received a systemic drug injection upon retrieval of the tone fear memory. All experiments used standard fear conditioning and reactivation procedures with freezing as the behavioral read-out (conceptual or exact replications of published reports) and common pharmacological agents. Additional tests confirmed that the applied drug doses and administration routes were effective in inducing their conventional effects on expression of fear (propranolol, acutely), body weight (rapamycin, anisomycin, cycloheximide), and consolidation of extinction memories (cycloheximide).ConclusionsIn contrast with previously published studies, we did not find evidence for drug-induced post-retrieval amnesia, underlining that this effect, as well as its clinical applicability, may be considerably more constrained and less readily reproduced than what the current literature would suggest.