A Hypersensitive Serotonergic Receptor Theory of Depression: The Role of Stress

1986 ◽  
pp. 443-460 ◽  
Author(s):  
M. H. Aprison ◽  
Joseph N. Hingtgen
Keyword(s):  
Receptor Theory ◽  
Serotonergic Receptor

Role of endogenous opioids and serotonin in the hemodynamic response to hemorrhage during hypoxia

1995 ◽  
Vol 269 (5) ◽  
pp. H1597-H1606 ◽  
Author(s):  
T. C. Resta ◽  
J. M. Resta ◽  
B. R. Walker
Keyword(s):  
Receptor Antagonist ◽  
Acute Hypoxia ◽  
Cardiovascular Responses ◽  
Endogenous Opioids ◽  
Receptor Subtype ◽  
Mdl 72222 ◽  
Hypoxic Conditions ◽  
Hemorrhage Volume ◽  
Serotonergic Receptor

Previous studies from our laboratory indicate that acute but not chronic hypoxia decreases the hemorrhage volume required to elicit reflex hypotension. Furthermore, chronically hypoxic animals exhibit an elevated hypotensive threshold during both normoxia and hypoxia compared with control animals. Because reports suggest that opioid and serotonergic mechanisms may be involved in mediating the sympathoinhibition that occurs with hemorrhage, we hypothesized that opioid and/or serotonergic systems are stimulated during hemorrhage under conditions of acute hypoxia and suppressed after chronic exposure to hypoxia and are thus responsible for the altered cardiovascular responses to hemorrhage under each condition. Control and chronically hypoxi rats were administered either the opioid receptor antagonist naltrexone (1 mg/kg), the selective 5-hydroxytryptamine receptor subtype 3 (5-HT3) serotonergic receptor antagonist MDL-72222 (0.5 mg/kg), or their respective vehicles intravenously before hemorrhage was initiated during normoxia or hypoxia (FIO2 = 0.12). In control animals, pretreatment with naltrexone increased the hemorrhage was initiated volume required to achieve hypotension in hypoxic but not normoxic conditions. Naltrexone had no effect on hypotensive threshold in chronically hypoxic animals under conditions of either normoxia or hypoxia. In addition, MDL-72222 had no effect on hypotensive threshold in either control or chronically hypoxic animals in either normoxic or hypoxic conditions. We conclude that endogenous opioids may contribute to the reflex hypotension that occurs during hypoxic hemorrhage in control rats, while no such involvement is evident in chronically hypoxic animals. Furthermore, peripheral 5-HT3 receptors are not likely involved in this response during either normoxic or hypoxic hemorrhage in control or chronically hypoxic rats.

Partial agonists of dopamine receptors: receptor theory and the dopamine hypothesis of psychosis

2021 ◽  
pp. 1-4 ◽  
Author(s):  
John Cookson ◽  
Jonathan Pimm
Keyword(s):  
Dopamine Receptors ◽  
Mechanism Of Action ◽  
Main Mechanism ◽  
Partial Agonism ◽  
Partial Agonists ◽  
Psychiatric Drugs ◽  
Receptor Theory ◽  
Dopamine Hypothesis

SUMMARY This article discusses dopamine partial agonism, which is the main mechanism of action of the psychiatric drugs aripiprazole, brexpiprazole and cariprazine. It outlines the principles of receptor theory and the structure of dopamine receptors; characterises agonists, antagonists and partial agonists; and summarises the dopamine hypothesis of psychosis and the role of dopamine and serotonin in depression.

Obsessive–compulsive disorder

2012 ◽  
pp. 765-773
Author(s):  
Joseph Zohar ◽  
Leah Fostick ◽  
Elizabeth Juven-Wetzler
Keyword(s):  
Obsessive Compulsive Disorder ◽  
Mechanism Of Action ◽  
Obsessive Compulsive ◽  
Compulsive Disorder ◽  
Serotonergic Receptor ◽  
Challenge Paradigm

The efficacy of the SRIs for OCD, together with the lack of efficacy of adrenergic antidepressants, has suggested that serotonin is involved in the pathophysiology of OCD. This relationship was validated by research on serotonergic markers in OCD and by the challenge paradigm. Which type of serotonergic receptor is involved in the pathogenesis and/or the mechanism of action of anti-obsessional drugs, is still unclear. However, the possible role of 5HT1B has emerged. Further studies are crucial for elucidating the role of serotonin and other neurotransmitters (i.e. dopamine) in the pathophysiology and management of OCD.

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor

Role of the allergist in diagnosis and management of patients with uveitis

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre
Keyword(s):  
Diagnosis And Management

The power of norms to sway fused group members

2018 ◽  
Vol 41 ◽  
Author(s):  
Winnifred R. Louis ◽  
Craig McGarty ◽  
Emma F. Thomas ◽  
Catherine E. Amiot ◽  
Fathali M. Moghaddam
Keyword(s):  
Evolutionary Anthropology ◽  
Normative Systems ◽  
Violent Extremism ◽  
Identity Fusion ◽  
Group Members

AbstractWhitehouse adapts insights from evolutionary anthropology to interpret extreme self-sacrifice through the concept of identity fusion. The model neglects the role of normative systems in shaping behaviors, especially in relation to violent extremism. In peaceful groups, increasing fusion will actually decrease extremism. Groups collectively appraise threats and opportunities, actively debate action options, and rarely choose violence toward self or others.

Elaborating the role of reflection and individual differences in the study of folk-economic beliefs

2018 ◽  
Vol 41 ◽  
Author(s):  
Kevin Arceneaux
Keyword(s):  
Decision Making ◽  
Individual Differences ◽  
Cognitive Processes ◽  
Evolutionary History ◽  
Behavioral Responses ◽  
History Of ◽  
Economic Beliefs

AbstractIntuitions guide decision-making, and looking to the evolutionary history of humans illuminates why some behavioral responses are more intuitive than others. Yet a place remains for cognitive processes to second-guess intuitive responses – that is, to be reflective – and individual differences abound in automatic, intuitive processing as well.

The role of affect in feelings of obligation

2020 ◽  
Vol 43 ◽  
Author(s):  
Stefen Beeler-Duden ◽  
Meltem Yucel ◽  
Amrisha Vaish
Keyword(s):  
Positive Emotions ◽  
The Creation ◽  
Sense Of Obligation

Abstract Tomasello offers a compelling account of the emergence of humans’ sense of obligation. We suggest that more needs to be said about the role of affect in the creation of obligations. We also argue that positive emotions such as gratitude evolved to encourage individuals to fulfill cooperative obligations without the negative quality that Tomasello proposes is inherent in obligations.

Refining our understanding of the “elephant in the room”

2020 ◽  
Vol 43 ◽  
Author(s):  
Andrew Whiten
Keyword(s):  
Social Cognition ◽  
Cultural Evolution ◽  
Cognitive Abilities ◽  
Critical Factors ◽  
Technological Culture

Abstract The authors do the field of cultural evolution a service by exploring the role of non-social cognition in human cumulative technological culture, truly neglected in comparison with socio-cognitive abilities frequently assumed to be the primary drivers. Some specifics of their delineation of the critical factors are problematic, however. I highlight recent chimpanzee–human comparative findings that should help refine such analyses.

Choosing a Markov blanket

2020 ◽  
Vol 43 ◽  
Author(s):  
Thomas Parr
Keyword(s):  
Markov Blanket ◽  
Target Article ◽  
The Relationship

Abstract This commentary focuses upon the relationship between two themes in the target article: the ways in which a Markov blanket may be defined and the role of precision and salience in mediating the interactions between what is internal and external to a system. These each rest upon the different perspectives we might take while “choosing” a Markov blanket.

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