Characterizing the Neural Substrates of Irritability in Women: an Experimental Neuroendocrine Model

The proposed study involves experimentally manipulating reproductive hormones in nonpregnant, euthymic women to create a scaled down version of the changes that occur during pregnancy and the postpartum period. This endocrine manipulation paradigm, which the investigators have shown provokes irritability in past studies, will be used to examine the neurocircuitry underlying irritability under baseline and hormone challenge conditions among women who are hormone sensitive (HS+; n=15) and non-hormone sensitive (HS-; n=15). The long-term goal of this research is to advance understanding of the neural systems underlying both the triggering of and susceptibility to irritability in women. The objective of the current project is to examine whether HS+ show differences in the behavioral activation system relative to HS- under baseline and hormone challenge conditions using functional magnetic resonance imaging (fMRI) and behavioral tests.

Study Overview

• Status: Completed
• Conditions: Depression; Depression, Postpartum; Post Partum Depression; Perinatal Depression
• Intervention / Treatment: Drug: Leuprolide Acetate 3.75 MG/ML; Drug: Estradiol 2 Mg tablet; Drug: Micronized progesterone

Detailed Description

Irritability, defined as a predisposition to exhibit anger, is a prominent, defining symptom of perinatal depression (PND) and many other neuropsychiatric disorders. Despite the near ubiquity of irritability across disorders, the neural dysfunction underlying the vulnerability to, onset of, and exacerbation of irritability is understudied and poorly understood. The proposed study involves experimentally manipulating reproductive hormones in nonpregnant, euthymic women to create a scaled down version of the changes that occur during pregnancy and the postpartum period. This endocrine manipulation paradigm, which the investigators have shown provokes irritability in past studies, will be used to examine the neurocircuitry underlying irritability under baseline and hormone challenge conditions among women who are hormone sensitive (HS+; n=15) and non-hormone sensitive (HS-; n=15). The long-term goal of this research is to advance understanding of the neural systems underlying both the triggering of and susceptibility to irritability in women. The objective of the current project is to examine whether HS+ show differences in the behavioral activation system relative to HS- under baseline and hormone challenge conditions using functional magnetic resonance imaging (fMRI) and behavioral tests. The investigator's central hypothesis is that reproductive hormone changes are associated with dysregulated threat and reward processing and consequent irritability in HS+. The rationale for the proposed study is that employing a scaled down model of puerperal hormonal events permits the identification of a group of individuals homogeneous for hormone sensitivity (HS+), hence creating the best opportunity for disentangling the specific changes in brain function due to reproductive hormones (i.e., HS-) from those accompanying reproductive hormone-precipitated affective dysfunction (i.e., HS+). Because women will act as their own controls across time, this study design also allows for a powerful evaluation of state and trait variables that may contribute to irritability, including both threat and reward processing. Identifying both state and trait markers of irritability, and disentangling them from the effects of reproductive hormones on brain and behavior, will allow for the identification of neural substrates of irritability susceptibility that can be investigated across neuropsychiatric disorders. The expected outcome of this research is the identification of neural circuits underlying both the susceptibility to and mediation of irritability.

• Study Type: Interventional
• Enrollment (Actual): 23
• Phase: Phase 2

Contacts and Locations

Study Locations

• United States
  • North Carolina
    • Chapel Hill, North Carolina, United States, 27514
      • University of North Carolina at Chapel Hill School of Medicine

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 22 years to 45 years (Adult)
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

Participants will include healthy, euthymic 22-45 year old women with a history of postpartum depression (n=15) and women without such a history (n=15). Thus, only participants capable of giving informed consent will be enrolled. Participants will be compensated upon completion of the study.

Inclusion Criteria. Group 1: Women with a history of perinatal depression

• A history of a the Diagnostic Statistic Manual of Mental Disorders - fifth edition (DSM-V) major depression episode that occurred within 6 weeks of childbirth (as determined by a SCID interview) and remitted at least one year prior to enrollment in the study;
• has been well for a minimum of one year;
• a regular menstrual cycle for at least three months;
• age 22-45;
• medication free (including birth control pills);.

Group 2: Healthy Controls

• Controls will meet all inclusion criteria specified above except they must not have any past or present Axis I diagnosis or evidence of menstrually related mood disorders.

A structured clinical interview for DSM-V (SCID) will be administered to all women prior to study entry. Any woman with a current axis I psychiatric diagnosis will be excluded from participating in this protocol.

Exclusion Criteria:

Patients will not be permitted to enter this protocol if they have important clinical or laboratory abnormalities including any of the following:

• current axis I psychiatric diagnosis (based on a structured clinical interview for DSM-V (SCID);
• endometriosis;
• undiagnosed enlargement of the ovaries;
• liver disease;
• breast cancer;
• a history of blood clots in the legs or lungs;
• undiagnosed vaginal bleeding;
• porphyria;
• diabetes mellitus;
• malignant melanoma;
• gallbladder or pancreatic disease;
• heart or kidney disease;
• cerebrovascular disease (stroke);
• cigarette smoking;
• a history of suicide attempts or psychotic episodes requiring hospitalization;
• recurrent migraine with aura;
• pregnancy-related medical conditions such as hyperemesis gravidarum, preeclampsia and toxemia, deep vein thrombosis (DVT) and bleeding diathesis;
• Any woman with a first degree relative (immediate family) with premenopausal breast cancer or breast cancer presenting in both breasts or any woman who has multiple family members (greater than three relatives) with postmenopausal breast cancer will also be excluded from participating in this protocol;

Any woman meeting the Stages of Reproductive Aging Workshop Criteria (STRAW) for perimenopause will be excluded from participation. Specifically, the investigators will exclude any woman with an elevated plasma follicle stimulating hormone (FSH) level (> 14 IU/L) and with menstrual cycle variability of > 7 days different from their normal cycle length.

Pregnant women will be excluded from participation (patients will be warned not to become pregnant during the study and will be advised to employ barrier contraceptive methods), and women who become pregnant (although unlikely because of the hormone manipulation) will be withdrawn. The use of leuprolide acetate is not recommended during pregnancy. Prior to treatment, a complete physical, including a serum β-human chorionic gonadotropin (HCG) test for pregnancy. Participants will be seen at the outpatient clinic on a regular biweekly basis. All participants will be required to use non-hormonal forms of birth control (e.g., barrier methods) to avoid pregnancy during this study. Participants will also undergo urine toxicology and pregnancy tests on the day of each of the two fMRI scans. If a woman becomes pregnant during the study, she will not complete the fMRI scan, and the hormone protocol will be discontinued.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: Non-Randomized
• Interventional Model: Parallel Assignment
• Masking: Double

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Hormone Sensitive Women (HS+); Participants will take leuprolide acetate (lupron) via intramuscular injection, for 2 months. Participants will take 2 mg of estradiol twice daily and 200 mg of progesterone twice daily for 2 weeks.	Drug: Leuprolide Acetate 3.75 MG/ML; 3.75 mg/month leuprolide acetate intramuscular injection; Other Names: Lupron; Drug: Estradiol 2 Mg tablet; 2 mg estradiol tablet; Other Names: Estrace; Drug: Micronized progesterone; 200 mg micronized progesterone tablets; Other Names: Prometrium
Experimental: Hormone Insensitive Women (HS-); Participants will take leuprolide acetate (lupron) via intramuscular injection, for 2 months. Participants will take 2 mg of estradiol twice daily and 200 mg of progesterone twice daily for 2 weeks.	Drug: Leuprolide Acetate 3.75 MG/ML; 3.75 mg/month leuprolide acetate intramuscular injection; Other Names: Lupron; Drug: Estradiol 2 Mg tablet; 2 mg estradiol tablet; Other Names: Estrace; Drug: Micronized progesterone; 200 mg micronized progesterone tablets; Other Names: Prometrium

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Mean Threat Processing Bias During Visual Dot-probe Paradigm Over Time	This outcome measure determines the extent to which irritability is characterized by dysfunctional threat processing during reproductive hormone challenge relative to baseline in HS+ and HS- by examining threat attention bias assessed during the visual dot-probe paradigm. The Visual Dot-Probe Paradigm asks participants to detect a target stimulus that is embedded in a matrix of distracting stimuli (e.g., a target stimulus, an angry face, might be embedded in a matrix of neutral distractor faces). Attention biases are inferred from faster response times to detect a threatening stimulus in a matrix of neutral stimuli relative to response time to detect neutral stimuli in neutral matrices. Thus, positive times reflect attention bias toward threat, whereas negative times reflect attention bias away from threat.	up to 6 weeks
Mean Right Amygdala-medial Prefrontal Cortex BOLD Connectivity During Implicit Emotion Face Processing Task Over Time	This outcome measure determines the extent to which irritability is characterized by dysfunctional threat processing during reproductive hormone challenge relative to baseline in HS+ and HS-. By examining amygdala-medial prefrontal cortex (PFC) Blood-oxygen-level-dependent (BOLD) connectivity in response to threatening faces on the implicit emotion face processing fMRI task in HS+ (compared with HS-) during hormone challenge relative to baseline. The implicit emotion face processing task asks participants to identify the gender of angry, happy, and fearful faces at 50%, 100% and 150% emotion intensity presented in random order for 2000 milliseconds followed by jittered fixation. Trials appear in 3 blocks, generating 30 trials of each emotion at each intensity and 90 neutral face emotion trials.	up to 6 weeks
Mean Left Amygdala-medial Prefrontal Cortex BOLD Connectivity During Implicit Emotion Face Processing Task Over Time	This outcome measure determines the extent to which irritability is characterized by dysfunctional threat processing during reproductive hormone challenge relative to baseline in HS+ and HS-. By examining amygdala-medial prefrontal cortex (PFC) connectivity in response to threatening faces on the implicit emotion face processing fMRI task in HS+ (compared with HS-) during hormone challenge relative to baseline. The implicit emotion face processing task asks participants to identify the gender of angry, happy, and fearful faces at 50%, 100% and 150% emotion intensity presented in random order for 2000 milliseconds followed by jittered fixation. Trials appear in 3 blocks, generating 30 trials of each emotion at each intensity and 90 neutral face emotion trials.	up to 6 weeks
Mean Reactive Aggression During Hormone Addback Over Time	This outcome measure determines the extent to which HS+ is characterized by reactive aggression during hormone addback relative to baseline in the target population. Reactive aggression will be defined as the number of point subtractions the participant makes during the Point Subtraction Aggression Paradigm. Point Subtraction Aggression Paradigm measures relational aggression (approach behavior) in response to frustration. In the task, participants are asked to press a button to accrue money or press another button to subtract money from a (fictional) partner at no direct gain to themselves. Frustration is induced by periodic subtractions of their own money, which is attributed to the partner.	up to 6 weeks
Mean BOLD Activation of the Right Amygdala During the Affective Posner Task Over Time	This outcome measure determines the extent to which HS+ is characterized by BOLD activation of the right amygdala in response to frustrative non-reward (FNR) in the Affective Posner Task during hormone addback relative to baseline in the target population. The Affective Posner Task tests whether HS+ is characterized by reduced subcortical activation in response to frustration. This task is divided into 3 runs: during Run 1 (practice run), participants receive accurate feedback about their performance on the task and do not win or lose money; during Run 2, participants receive accurate feedback about their performance and win or lose 50 cents per trial; and during Run 3 (frustration), participants are told they must respond accurately to win money, but participants are given feedback that they responded too slowly on 60% of accurate trials, regardless of their performance.	up to 6 weeks
Mean BOLD Activation of the Left Amygdala During the Affective Posner Task Over Time	This outcome measure determines the extent to which HS+ is characterized by BOLD activation of the left amygdala in response to frustrative non-reward (FNR) in the Affective Posner Task during hormone addback relative to baseline in the target population. The Affective Posner Task tests whether HS+ is characterized by reduced subcortical activation in response to frustration. This task is divided into 3 runs: during Run 1 (practice run), participants receive accurate feedback about their performance on the task and do not win or lose money; during Run 2, participants receive accurate feedback about their performance and win or lose 50 cents per trial; and during Run 3 (frustration), participants are told they must respond accurately to win money, but participants are given feedback that they responded too slowly on 60% of accurate trials, regardless of their performance.	up to 6 weeks
Mean BOLD Activation of the Right Caudate During the Affective Posner Task Over Time	This outcome measure determines the extent to which HS+ is characterized by BOLD activation of the right caudate in response to frustrative non-reward (FNR) in the Affective Posner Task during hormone addback relative to baseline in the target population. The Affective Posner Task tests whether HS+ is characterized by reduced subcortical activation in response to frustration. This task is divided into 3 runs: during Run 1 (practice run), participants receive accurate feedback about their performance on the task and do not win or lose money; during Run 2, participants receive accurate feedback about their performance and win or lose 50 cents per trial; and during Run 3 (frustration), participants are told they must respond accurately to win money, but participants are given feedback that they responded too slowly on 60% of accurate trials, regardless of their performance.	up to 6 weeks
Mean BOLD Activation of the Left Caudate During the Affective Posner Task Over Time	This outcome measure determines the extent to which HS+ is characterized by BOLD activation of the left caudate in response to frustrative non-reward (FNR) in the Affective Posner Task during hormone addback relative to baseline in the target population. The Affective Posner Task tests whether HS+ is characterized by reduced subcortical activation in response to frustration. This task is divided into 3 runs: during Run 1 (practice run), participants receive accurate feedback about their performance on the task and do not win or lose money; during Run 2, participants receive accurate feedback about their performance and win or lose 50 cents per trial; and during Run 3 (frustration), participants are told they must respond accurately to win money, but participants are given feedback that they responded too slowly on 60% of accurate trials, regardless of their performance.	up to 6 weeks
Mean BOLD Activation of the Right Putamen During the Affective Posner Task Over Time	This outcome measure determines the extent to which HS+ is characterized by BOLD activation of the right putamen in response to frustrative non-reward (FNR) in the Affective Posner Task during hormone addback relative to baseline in the target population. The Affective Posner Task tests whether HS+ is characterized by reduced subcortical activation in response to frustration. This task is divided into 3 runs: during Run 1 (practice run), participants receive accurate feedback about their performance on the task and do not win or lose money; during Run 2, participants receive accurate feedback about their performance and win or lose 50 cents per trial; and during Run 3 (frustration), participants are told they must respond accurately to win money, but participants are given feedback that they responded too slowly on 60% of accurate trials, regardless of their performance.	up to 6 weeks
Mean BOLD Activation of the Left Putamen During the Affective Posner Task Over Time	This outcome measure determines the extent to which HS+ is characterized by BOLD activation of the left putamen in response to frustrative non-reward (FNR) in the Affective Posner Task during hormone addback relative to baseline in the target population. The Affective Posner Task tests whether HS+ is characterized by reduced subcortical activation in response to frustration. This task is divided into 3 runs: during Run 1 (practice run), participants receive accurate feedback about their performance on the task and do not win or lose money; during Run 2, participants receive accurate feedback about their performance and win or lose 50 cents per trial; and during Run 3 (frustration), participants are told they must respond accurately to win money, but participants are given feedback that they responded too slowly on 60% of accurate trials, regardless of their performance.	up to 6 weeks
Mean BOLD Activation of the Right Nucleus Accumbens During the Affective Posner Task Over Time	This outcome measure determines the extent to which HS+ is characterized by BOLD activation of the right nucleus accumbens in response to frustrative non-reward (FNR) in the Affective Posner Task during hormone addback relative to baseline in the target population. The Affective Posner Task tests whether HS+ is characterized by reduced subcortical activation in response to frustration. This task is divided into 3 runs: during Run 1 (practice run), participants receive accurate feedback about their performance on the task and do not win or lose money; during Run 2, participants receive accurate feedback about their performance and win or lose 50 cents per trial; and during Run 3 (frustration), participants are told they must respond accurately to win money, but participants are given feedback that they responded too slowly on 60% of accurate trials, regardless of their performance.	up to 6 weeks
Mean BOLD Activation of the Left Nucleus Accumbens During the Affective Posner Task Over Time	This outcome measure determines the extent to which HS+ is characterized by BOLD activation of the left nucleus accumbens in response to frustrative non-reward (FNR) in the Affective Posner Task during hormone addback relative to baseline in the target population. The Affective Posner Task tests whether HS+ is characterized by reduced subcortical activation in response to frustration. This task is divided into 3 runs: during Run 1 (practice run), participants receive accurate feedback about their performance on the task and do not win or lose money; during Run 2, participants receive accurate feedback about their performance and win or lose 50 cents per trial; and during Run 3 (frustration), participants are told they must respond accurately to win money, but participants are given feedback that they responded too slowly on 60% of accurate trials, regardless of their performance.	up to 6 weeks

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Correlation Between the Inventory of Depressive and Anxiety Symptoms (IDAS) Ill -0.8Scale and Threat Attention Bias	This outcome measure determines the extent to which irritability is characterized by dysfunctional reward processing during reproductive hormone challenge in HS+ and HS- by examining the correlation between the Inventory of Depressive and Anxiety Symptoms (IDAS) Ill Temper (i.e., irritability) Scale and threat attention bias.	Endpoint (week 6)
Correlation Between the Inventory of Depressive and Anxiety Symptoms (IDAS) Ill Temper Scale and Right Amygdala-medial Prefrontal Cortex (PFC) BOLD Connectivity.	This outcome measure determines the extent to which irritability is characterized by dysfunctional reward processing during reproductive hormone challenge in HS+ and HS- by examining the correlation between the IDAS Ill Temper (i.e., irritability) Scale and amygdala-medial PFC connectivity in HS+.	Endpoint (week 6)
Correlation Between the Inventory of Depressive and Anxiety Symptoms (IDAS) Ill Temper Scale and Left Amygdala-medial Prefrontal Cortex (PFC) BOLD Connectivity.	This outcome measure determines the extent to which irritability is characterized by dysfunctional reward processing during reproductive hormone challenge in HS+ and HS- by examining the correlation between the IDAS Ill Temper (i.e., irritability) Scale and amygdala-medial PFC connectivity in HS+.	Endpoint (week 6)
Correlation Between Irritability and Reactive Aggression During Hormone Addback	This outcome measure determines the degree of irritability and reactive aggression in HS+ during hormone addback and its relationship to the target population. Irritability will be defined as score on the IDAS Ill Temper Scale. Reactive aggression will be defined as the number of point subtractions the participant makes during the Point Subtraction Aggression Paradigm. The Point Subtraction Aggression Paradigm measures relational aggression (approach behavior) in response to frustration. In the task, participants are asked to press a button to ac	Endpoint (week 6)
Correlation Between Irritability Subcortical Activation in HS+ During Hormone Addback	This outcome measure determines the degree of subcortical (amygdala, caudate, putamen, and nucleus accumbens) activation in HS+ during hormone addback and it's relationship to the target population. The activation in amygdala and ventral striatum (caudate, putamen, nucleus accumbens) regions of interest (ROIs) will be assessed during the Affective Posner Task. The Affective Posner Task tests whether HS+ is characterized by reduced subcortical activation in response to frustration. This task is divided into 3 runs: during Run 1 (practice run), participants receive accurate feedback about their performance on the task and do not win or lose money; during Run 2, participants receive accurate feedback about their performance and win or lose 50 cents per trial; and during Run 3 (frustration), participants are told they must respond accurately to win money, but participants are given feedback that they responded too slowly on 60% of accurate trials, regardless of their performance.	Endpoint (week 6)

Collaborators and Investigators

• Sponsor: University of North Carolina, Chapel Hill
• Collaborators: National Institute of Mental Health (NIMH)
• Investigators: Principal Investigator: Crystal E Schiller, PhD, UNC Dept of Psychiatry

Publications and helpful links

General Publications

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Study record dates

Study Major Dates

• Study Start (Actual): January 2, 2020
• Primary Completion (Actual): July 15, 2022
• Study Completion (Actual): July 19, 2022

Study Registration Dates

• First Submitted: August 7, 2019
• First Submitted That Met QC Criteria: August 7, 2019
• First Posted (Actual): August 9, 2019

Study Record Updates

• Last Update Posted (Actual): August 25, 2023
• Last Update Submitted That Met QC Criteria: August 3, 2023
• Last Verified: May 1, 2023

More Information

Terms related to this study

• Keywords: Functional Magnetic Resonance Imaging; Mood Disorders; Postpartum; Lupron Depot; Mental Disorders; Irritability; Perinatal Depression; Progesterone; Hormones; Estrogen; Physiological effects of drugs; Reproductive Control Agents; Hormone Intervention
• Additional Relevant MeSH Terms: Behavioral Symptoms; Mental Disorders; Mood Disorders; Pregnancy Complications; Puerperal Disorders; Female Urogenital Diseases and Pregnancy Complications; Urogenital Diseases; Depression; Depressive Disorder; Depression, Postpartum; Physiological Effects of Drugs; Antineoplastic Agents; Hormones; Hormones, Hormone Substitutes, and Hormone Antagonists; Antineoplastic Agents, Hormonal; Estrogens; Reproductive Control Agents; Fertility Agents, Female; Fertility Agents; Progestins; Leuprolide; Estradiol; Progesterone
• Other Study ID Numbers: 19-0401; R21MH119615-01 (U.S. NIH Grant/Contract)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES
• IPD Plan Description: Deidentified individual data that supports the results will be shared beginning 18 to 24 months following publication provided the investigator who proposes to use the data has approval from an Institutional Review Board (IRB), Independent Ethics Committee (IEC), or Research Ethics Board (REB), as applicable, and executes a data use/sharing agreement with UNC.
• IPD Sharing Time Frame: Deidentified individual data that supports the results will be shared beginning 18 to 24 months following publication.
• IPD Sharing Access Criteria: Approval from an IRB, IEC, or REB, as applicable and execution of a data use/sharing agreement with UNC.
• IPD Sharing Supporting Information Type: SAP; ANALYTIC_CODE

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No