Losartan and Emotional Memory

University of Oxford

Status

Completed

Conditions

Learning

Memory

Treatments

Drug: Losartan Potassium

Other: placebo

Study type

Interventional

Funder types

Other

Identifiers

NCT03763409

R56384/RE001

Details and patient eligibility

About

This study explores the effects of single-dose losartan (50mg) versus identical placebo capsule on emotional memory and learning in healthy volunteers.

Full description

The commonly prescribed antihypertensive drug losartan (brand name: Cozaar; UK licensed for 20 years) targets the renin-angiotensin system - a hormone system regulating blood pressure - by acting as an angiotensin receptor antagonist. In particular, the drug prevents a docking of the protein angiotensin IV to AT1 receptors, which leads to a dilation if vessels and a reduction in blood pressure. However, the increase in free angiotensin IV has also been associated with an increase in synaptic plasticity, the cellular mechanism involved in learning and memory. As such, losartan appears to have cognition-enhancing properties, in a way that a single dose of 50mg improves prospective memory in healthy humans. However, preliminary pre-clinical results also suggest that a single injection of the drug improves fear extinction in rodents, which is the equivalent to human cognitive-behavioural therapy for anxiety disorders. Furthermore, compared to other antihypertensive drugs, regular losartan treatment appears to prevent the development of post-traumatic stress disorder symptoms following trauma exposition. Such results suggest that the renin-angiotensin system plays a key role in the development and extinction of anxiety, and that adding losartan to cognitive-behavioural therapy for anxiety in humans might have synergistic effects. However, it remains to be clarified what the basic effects of this drug on emotional information processing in humans are to identify mechanisms by which it may improve psychological treatments.

In this study, the key neuropsychological effects of probing the renin-angiotensin system on emotional information processing and learning will be investigated. In a double-blind, randomised between-groups design, 54 healthy volunteers will be randomised to a group receiving a single dose of losartan (50mg) versus placebo. When peak plasma levels are reached, participants will work on a battery of behavioural measures of emotional information processing and learning.

The results from this study will help understand how the renin-angiotensin system affects emotional information processing and learning, and they will help establish a battery of tasks that sensitively respond to such manipulations. Such information will ultimately lead to the development of losartan and similar agents for the more effective and more compact treatment of anxiety disorders.

Enrollment

53 patients

Sex

All

Ages

18 to 50 years old

Volunteers

Accepts Healthy Volunteers

Inclusion criteria

willing and able to provide informed consent
male or Female, aged 18-50
body mass index (BMI) of 18-30 kg/m2
fluent English skills
non- or light-smoker (< 5 cigarettes a day)

Exclusion criteria

Female participant who is pregnant or breast-feeding
CNS-active medication during the last 6 weeks
Current blood pressure or other heart medication (especially aliskiren or beta blockers)
Intravascular fluid depletion
Past or present DSM-IV axis-I diagnosis or suspected diagnosis (from SCID results at screening)
Alcohol or substance abuse
First-degree family member with a history of a severe psychiatric disease
Impaired liver or kidney function
Lifetime history of epilepsy or other neurological disease, systemic infection, or clinically significant hepatic, cardiac, obstructive respiratory, renal, cerebrovascular, metabolic, endocrine or pulmonary disease or disorder which, in the opinion of the investigator, may either put the participants at risk because of participation in the study, or may influence the result of the study, or the participant's ability to participate in the study.
Insufficient English skills
participated in another study involving CNS-active medication during the last 6 weeks