The unappreciated roles of the cholecystokinin receptor CCK(1) in brain functioning

AbstractThe CCK(1) receptor is a G-protein-coupled receptor activated by the sulfated forms of cholecystokinin (CCK), a gastrin-like peptide released in the gastrointestinal tract and mammal brain. A substantial body of research supports the hypothesis that CCK(1)r stimulates gallbladder contraction and pancreatic secretion in the gut, as well as satiety in brain. However, this receptor may also fulfill relevant roles in behavior, thanks to its widespread distribution in the brain. The strategic location of CCK(1)r in mesolimbic structures and specific hypothalamic and brainstem nuclei lead to complex interactions with neurotransmitters like dopamine, serotonin, and glutamate, as well as hypothalamic hormones and neuropeptides. The activity of CCK(1)r maintains adequate levels of dopamine and regulates the activity of serotonin neurons of raphe nuclei, which makes CCK(1)r an interesting therapeutic target for the development of adjuvant treatments for schizophrenia, drug addiction, and mood disorders. Unexplored functions of CCK(1)r, like the transmission of interoceptive sensitivity in addition to the regulation of hypothalamic hormones and neurotransmitters affecting emotional states, well-being, and attachment behaviors, may open exciting roads of research. The absence of specific ligands for the CCK(1) receptor has complicated the study of its distribution in brain so that research about its impact on behavior has been published sporadically over the last 30 years. The present review reunites all this body of evidence in a comprehensive way to summarize our knowledge about the actual role of CCK in the neurobiology of mental illness.

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Molecular modelling study of the role of cholesterol in the stimulation of the oxytocin receptor.

Acta Biochimica Polonica ◽

10.18388/abp.2001_5114 ◽

2001 ◽

Vol 48 (1) ◽

pp. 83-93 ◽

Cited By ~ 15

Author(s):

E Politowska ◽

R Kaźmierkiewicz ◽

V Wiegand ◽

F Fahrenholz ◽

J Ciarkowski

Keyword(s):

Molecular Modelling ◽

Oxytocin Receptor ◽

G Protein Coupled Receptors ◽

Membrane Properties ◽

In Vivo Studies ◽

Cholecystokinin Receptor ◽

Conformational Preferences ◽

G Protein Coupled

Cholesterol, an integral component of membranes in Eucaryota, is a modifier of membrane properties. In vivo studies have demonstrated that cholesterol can also modulate activities of some G protein-coupled receptors (GPCRs), which are integral membrane proteins. This can result either from an effect of cholesterol on the membrane fluidity or from specific interactions of the membrane cholesterol with the receptor, as recently demonstrated for the cholecystokinin type beta (CCKRbeta) or the oxytocin receptor (OTR). Using molecular modelling, we studied conformational preferences of cholesterol and several of its analogues. Subsequently, we simulated the distributions of their preferred conformations around the surface of OTR, CCKRbeta and a chimeric oxytocin/cholecystokinin receptor. Consequently, we suggest residues on the surface of OTR which are potentially significant in the OTR/cholesterol interaction.

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Social Motives Predict Loneliness During a Developmental Transition

Swiss Journal of Psychology ◽

10.1024/1421-0185/a000201 ◽

2017 ◽

Vol 76 (4) ◽

pp. 145-153 ◽

Cited By ~ 4

Author(s):

Jana Nikitin ◽

Alexandra M. Freund

Keyword(s):

Social Relationships ◽

Well Being ◽

Social Avoidance ◽

Social Approach ◽

Social Motives ◽

Developmental Transitions ◽

Avoidance Motivation ◽

Negative Effect ◽

Low Levels

Abstract. Establishing new social relationships is important for mastering developmental transitions in young adulthood. In a 2-year longitudinal study with four measurement occasions (T1: n = 245, T2: n = 96, T3: n = 103, T4: n = 85), we investigated the role of social motives in college students’ mastery of the transition of moving out of the parental home, using loneliness as an indicator of poor adjustment to the transition. Students with strong social approach motivation reported stable and low levels of loneliness. In contrast, students with strong social avoidance motivation reported high levels of loneliness. However, this effect dissipated relatively quickly as most of the young adults adapted to the transition over a period of several weeks. The present study also provides evidence for an interaction between social approach and social avoidance motives: Social approach motives buffered the negative effect on social well-being of social avoidance motives. These results illustrate the importance of social approach and social avoidance motives and their interplay during developmental transitions.

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Assessment of health related issues in individuals’, couples’, and families’ daily life

Zeitschrift für Gesundheitspsychologie ◽

10.1026/0943-8149.16.3.146 ◽

2008 ◽

Vol 16 (3) ◽

pp. 146-149 ◽

Cited By ~ 2

Author(s):

Meinrad Perrez ◽

Michael Reicherts ◽

Yves Hänggi ◽

Andrea B. Horn ◽

Gisela Michel ◽

...

Keyword(s):

Emotion Regulation ◽

Daily Life ◽

Ecological Validity ◽

Reliability And Validity ◽

Well Being ◽

Computer Assisted ◽

Emotional States ◽

Self Reports ◽

Health Related ◽

Lower Variability

Abstract. Most research in health psychology is based on retrospective self reports, which are distorted by recall biases and have low ecological validity. To overcome such limitations we developed computer assisted diary approaches to assess health related behaviours in individuals’, couples’ and families’ daily life. The event- and time-sampling-based instruments serve to assess appraisals of the current situation, feelings of physical discomfort, current emotional states, conflict and emotion regulation in daily life. They have proved sufficient reliability and validity in the context of individual, couple and family research with respect to issues like emotion regulation and health. As examples: Regarding symptom reporting curvilinear pattern of frequencies over the day could be identified by parents and adolescents; or psychological well-being is associated with lower variability in basic affect dimensions. In addition, we report on preventive studies to improve parental skills and enhance their empathic competences towards their baby, and towards their partner.

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Psychological Resilience Provides No Independent Protection From Suicidal Risk

Crisis ◽

10.1027/0227-5910/a000364 ◽

2016 ◽

Vol 37 (2) ◽

pp. 130-139 ◽

Cited By ~ 9

Author(s):

Danica W. Y. Liu ◽

A. Kate Fairweather-Schmidt ◽

Richard Burns ◽

Rachel M. Roberts ◽

Kaarin J. Anstey

Keyword(s):

Risk Factors ◽

Well Being ◽

Current Status ◽

Psychological Resilience ◽

Cross Sectional ◽

Life Project ◽

Resilience Factors ◽

First Time

Abstract. Background: Little is known about the role of resilience in the likelihood of suicidal ideation (SI) over time. Aims: We examined the association between resilience and SI in a young-adult cohort over 4 years. Our objectives were to determine whether resilience was associated with SI at follow-up or, conversely, whether SI was associated with lowered resilience at follow-up. Method: Participants were selected from the Personality and Total Health (PATH) Through Life Project from Canberra and Queanbeyan, Australia, aged 28–32 years at the first time point and 32–36 at the second. Multinomial, linear, and binary regression analyses explored the association between resilience and SI over two time points. Models were adjusted for suicidality risk factors. Results: While unadjusted analyses identified associations between resilience and SI, these effects were fully explained by the inclusion of other suicidality risk factors. Conclusion: Despite strong cross-sectional associations, resilience and SI appear to be unrelated in a longitudinal context, once risk/resilience factors are controlled for. As independent indicators of psychological well-being, suicidality and resilience are essential if current status is to be captured. However, the addition of other factors (e.g., support, mastery) makes this association tenuous. Consequently, resilience per se may not be protective of SI.

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Prospective Memory Development Across the Lifespan

European Psychologist ◽

10.1027/1016-9040/a000380 ◽

2020 ◽

Vol 25 (3) ◽

pp. 162-173 ◽

Cited By ~ 1

Author(s):

Sascha Zuber ◽

Matthias Kliegel

Keyword(s):

Prospective Memory ◽

Healthy Aging ◽

Present Model ◽

Current Knowledge ◽

Well Being ◽

The Elderly ◽

Cognitive Factors ◽

Everyday Functioning ◽

Integrative Framework

Abstract. Prospective Memory (PM; i.e., the ability to remember to perform planned tasks) represents a key proxy of healthy aging, as it relates to older adults’ everyday functioning, autonomy, and personal well-being. The current review illustrates how PM performance develops across the lifespan and how multiple cognitive and non-cognitive factors influence this trajectory. Further, a new, integrative framework is presented, detailing how those processes interplay in retrieving and executing delayed intentions. Specifically, while most previous models have focused on memory processes, the present model focuses on the role of executive functioning in PM and its development across the lifespan. Finally, a practical outlook is presented, suggesting how the current knowledge can be applied in geriatrics and geropsychology to promote healthy aging by maintaining prospective abilities in the elderly.

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