Identification and Clinical Relevance of an Oxytocin Deficient State (Melatonin Study)

Not Applicable

Completed

• Conditions: Oxytocin Deficiency; Hypothalamic Obesity; Central Diabetes Insipidus; Hypopituitarism; Pituitary Dysfunction; Social Isolation

• Registration Number: NCT05319301
• Lead Sponsor: Fundació Institut de Recerca de l'Hospital de la Santa Creu i Sant Pau

Brief Summary

Oxytocin (OT) is a hypothalamic peptide that enters the peripheral circulation via the posterior pituitary gland. OT plays a key role in regulating appetite, psychopathology, prosocial behavior and sexual function. Hypopituitarism is associated with increased obesity, increased psychopathology, sexual and prosocial dysfunction despite appropriate hormone replacement. A few studies suggest the existence of a possible OT deficient state in hypopituitarism. In animal models, melatonin has shown to increase OT release.

This study is designed to evaluate oxytocin values after administration of melatonin in adults (healthy volunteers and patients with hypopituitarism).

The investigators hypothesize that OT response will be blunted following melatonin in patients with hypopituitarism compared to healthy controls.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2022-03-17
• Study First Submitted QC: 2022-03-31
• Study Start: 2022-04-01
• Study First Posted: 2022-04-08
• Status Verified: 2023-03
• Primary Completion: 2023-09-01
• Study Completion: 2023-11-01
• Last Update Submitted: 2024-04-08
• Last Update Posted: 2024-04-09

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 40

Inclusion Criteria

• Patients with hypopituitarism (HYPO) (>1 pituitary hormone deficiency) and stable hormone replacement for the prior three months
• At least one clinical sign of hypothalamic damage

Exclusion Criteria

• uncorrected hormone deficiency
• creatinine >1.5mg/dL
• alanine aminotransferase (ALT) or aspartate aminotransferase (AST) >2.5x upper limit of normal
• hematocrit less than 30%
• suicidality or active psychosis
• participation in a trial with investigational drugs within 30 days
• using a high glucocorticoid dose
• vigorous physical exercise
• alcohol intake within 24 hours before the study participation
• evidence of any acute illness or any illness that the Investigator determines could interfere with study participation or safety
• pregnancy or breastfeeding for last 8 weeks
• known allergies towards melatonin
• patients refusing or unable to give written informed consent
• patients receiving fluvoxamine and/or impossibility to stop hypnotics 48 hours prior to the study visit.
• Additionally for healthy controls: the presence of brain or pituitary tumor, radiation involving the hypothalamus or pituitary, history of hypopituitarism or receiving testosterone or glucocorticoids esters.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
Change in oxytocin concentration	Baseline blood exam (timepoint 0) and further blood collections after 30, 60, 90 and 120 minutes after baseline blood collection	Change in oxytocin concentration (pg/mL) after administration of 1.9 mg of melatonin orally.

Secondary Outcome Measures

Name	Time	Method
Overall oxytocin secretion	Within the two hours after the injection	Oxytocin area under the curve after administration of 1.9 melatonin administered orally
Impulsivity assessment	At baseline	Correlation between Barratt Impulsiveness Scale (range from 30 to 120, higher scores indicate greater impulsivity) and baseline oxytocin concentration (pg/mL)
Maximal change in oxytocin concentration (pg/mL)	Within the two hours after the injection	Maximal change in oxytocin concentration (pg/mL) after administration of 1.9 mg of melatonin administered orally.
Mood assessment	At baseline	Correlation between Beck Depression Inventory-2 score (range from 0 to 63, higher scores mean a worse outcome) and baseline oxytocin concentration (pg/mL)
Quality of life assessment	At baseline	Correlation between 36 item- Short Form Health Survey score (range from 0 to 100, the higher scores indicate better health status) and baseline oxytocin concentration (pg/mL)
Alexithymia assessment	At baseline	Correlation between Toronto Alexithymia scales-20 score (range from 20 to 100, higher scores mean a worse outcome) and baseline oxytocin concentration (pg/mL)

Trial Locations

Locations (1)

Hospital de la Santa Creu i Sant Pau; 🇪🇸 Barcelona, Spain