Treatment of Chronic Itch in Atopic Dermatitis With Opioid Antagonist Naltrexone

March 31, 2023 updated by: University of Minnesota

Treatment of Chronic Itch in Atopic Dermatitis With Opioid Antagonist Naltrexone and Effects on Skin Circadian Rhythm

Purpose: To study the etiology and the epigenetic pathways leading to and regulating chronic itch. Similarly, to examine the mechanisms underlying skin changes, including epigenetic alterations while also testing the efficacy of opioid antagonists in atopic dermatitis. In this study, the investigators aim to examine chronic sensory disorder mechanisms related to chronic itch.

Study Overview

Detailed Description

Specific aims:

A1 Evaluate the underlying mechanism of itch severity in terms of circadian rhythm by collecting epidermis at different circadian stages using suction blisters. This will be done in AD patients with chronic itch. The cells will be isolated from part of the suction blisters and used to isolate and sequence RNA to evaluate and compare the differential protein and RNA expression in suction blister taken from symptomatic & non-symptomatic areas in patients with AD at different time points. The investigators will then correlate the itch severity symptoms to clock gene and opioid receptor levels and RNA expression differential pattern. A1 will be evaluated by study arm A and the results from this study will serve to decide on time point taking the suction blisters for the therapeutic/mechanistic studies (arm B and C).

A2 Investigate the mechanistic role and therapeutic efficacy of opioid receptors in chronic itch. For this purpose, a cross-over, placebo-controlled design will be used to treat patients with opioid receptor antagonist (Naltrexone) by expanding on our existing trial. The investigators will collect, evaluate, quantify and compare the differential protein and RNA expression in epidermis taken by suction blisters from symptomatic and non-symptomatic areas in patients with AD on Placebo or Naltrexone treatment. Transcriptome analysis will be focused, but not restricted to, analysis of neuroinflammatory and neuronal markers (including cytokines, GPCR and opioid receptors). Confirmation will occur using in-situ hybridization of biopsies to correlate specific cell type and location and qPCR expression of in vitro cultures. The binding studies using fluorescent labeled opioid ligands and internalization pattern will be carried out.

A3 Test the underlying mechanisms of the opioid system with nerve-keratinocyte interaction and possible effects on itch transduction from skin to nerves by using an in vitro neuron-keratinocyte co-culture model. Moreover, the investigators plan to validate itch-causing networks and pathways found in A2 using this in vitro model and will be able to evaluate calcium flux threshold changes after exposure to external stimuli (e.g. light, or mechanic stimuli) onto keratinocytes and neuronal somata under different opioid exposure conditions. The FC derived sensory neurons will be co-cultured with different patient KC. The investigators will test the reaction pattern of KC and transmission of the signal to connected peripheral sensory neurons by Fluo-4 AM Calcium imaging and electrophysiology. The reaction will be responding to the odorant Sandalore, as the investigators have previously published that Sandalore induces these desired calcium fluxes.

Apply the in vitro epithelial/nerve model to validate possible itch pathways identified by epigenetic analysis in the clinical trials by confirming the expression pattern with qPCR and functional assays on cells with CRISPR knockout of the RNA targets, opioid trafficking, calcium imaging and electrophysiology. Finally, further develop co-cultures between human skin and iPS-derived human peripheral neurons to perform functional studies.

Study Type

Interventional

Phase

  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

    • Minnesota
      • Minneapolis, Minnesota, United States, 55455
        • University of Minnesota
        • Contact:
          • Paul Bigliardi, MD

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 70 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Diagnosis of AD via simplified UK Working Group Criteria and a baseline PSGA score of 2 or greater
  • Willingness to adhere to study protocol
  • Subjects taking hormone-containing medications must be on a stable dose for 6 months prior to study start to avoid any confounding influence on sensory and pain perception

Exclusion Criteria:

  • Use of topical or oral anti-inflammatory medications for 2 weeks prior to the study start.
  • Use of topical or oral anti-histamines for 2 weeks prior to the study start (as rescue medication allowed).
  • Use of topical or oral anti-pruritic agents for 2 weeks prior to the study start.
  • Use of oral neuromodulatory agents for 2 months prior to study start.
  • Current use of chronic pain medications (including opioids, antidepressants and anti-epileptic drugs).
  • Use of nicotine-containing products for the past 6 months prior to study start.
  • History of radiation or chemotherapy.
  • History of traumatic injury on prospective test sites.
  • Unstable thyroid function within the past 6 months prior to study start to exclude thyroid-related neuropathy
  • Known history of central or peripheral nervous system dysfunction.
  • History of acute hepatitis, chronic liver disease or end stage liver disease.
  • History of human immunodeficiency virus (HIV) or acquired immune deficiency syndrome.
  • History of neuropathy associated with chronic obstructive pulmonary disease, diabetes mellitus, documented exposure to organophosphates or heavy metals or polychlorinated biphenyls.
  • Known nutritional deficiency (vitamin B12, vitamin D, iron or zinc) within 3 months prior to the study start.
  • Use of illicit drugs within the past 6 months prior to study start and/or opioid use disorder.
  • Regular use of opioids for chronic pain
  • Lyme disease, porphyria, rheumatoid arthritis, Hansen's disease (leprosy) or use of antineoplastic chemotherapeutic agents.
  • Subject has any medical condition that, in the judgment of the Investigator, would jeopardize the subject's safety following exposure to the administered medications.
  • Adults lacking capacity to consent

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Cohort 1: Placebo, then Intervention
Patients will start with placebo in week 1 and cross over to Naltrexone in week 3. There will be a wash-out phase during week 2 using only moisturizer regularly and if necessary as rescue medications topical corticosteroids and/or antihistamines. The same rescue medications can be used during the following weeks of the cross-over treatment. At visit 2 and 4 patients will be asked the area where they are experiencing most intense itch and we will take there suction blisters (preferably on the trunk). Suction blisters will be taken after week 1 (1 week on treatment arm 1) and after week 3 (1 week on treatment arm 2).
50mg Naltrexone daily
Placebo (Mannitol) daily
Active Comparator: Cohort 2: Intevention, then Placebo
Patients will start with Naltrexone in week 1 and cross over to the palcebo treatment in week 3. There will be a wash-out phase during week 2 using only moisturizer regularly and if necessary as rescue medications topical corticosteroids and/or antihistamines. The same rescue medications can be used during the following weeks of the cross-over treatment. At visit 2 and 4 patients will be asked the area where they are experiencing most intense itch and we will take there suction blisters (preferably on the trunk). Suction blisters will be taken after week 1 (1 week on treatment arm 1) and after week 3 (1 week on treatment arm 2).
50mg Naltrexone daily
Placebo (Mannitol) daily
No Intervention: Circadian Rhythm of Itch
Patients in this arm will receive no intervention, only data collection.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in Itch Intensity (Visual Analog Scale)
Time Frame: 1 week
Change in itch intensity will be measured using a Visual Analogue scale (VAS). Scores range from 0 to 10, with higher scores indicating greater itch intensity.
1 week

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Investigators

  • Principal Investigator: Paul Bigliardi, MD, University of Minnesota

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Anticipated)

December 31, 2022

Primary Completion (Anticipated)

June 1, 2024

Study Completion (Anticipated)

June 1, 2024

Study Registration Dates

First Submitted

March 25, 2020

First Submitted That Met QC Criteria

March 25, 2020

First Posted (Actual)

March 30, 2020

Study Record Updates

Last Update Posted (Actual)

April 4, 2023

Last Update Submitted That Met QC Criteria

March 31, 2023

Last Verified

March 1, 2023

More Information

Terms related to this study

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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