- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04985526
Skin Microbiome and Polymorphic Light Eruption (PLE_microbio)
The Significance of the Skin Microbiome in the Pathophysiology of Polymorphic Light Eruption
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
UV-induced erythema and pigmentation is quantified by visual scoring and reflectance spectroscopy to determine the minimum erythema dose (MED) exploring the fields of an UV test ladder on the dorsal skin of the study subjects.
Investigations after determining the MED and consecutive photo provocations on 4 subsequent days (PLE group only) using solar simulated UV radiation with slight dose increments include a half-body site comparison of test areas located on the back of the subjects in a randomized, double blinded manner. The microbiota of a respective test area is removed by the disinfection with Octeniderm (octenidine dihydrochloride, 1-propanol, 2- propanol) whereas a control site remains non-disinfected (sham-treated with physiologic sodium chloride solution).
The PLE related symptoms are evaluated by a validated PLE score, which is composed as follows:
Affected skin area (AA) [range, 0-4] + skin infiltration (SI) [range, 0-4] + 0.4 pruritus (P) [range, 0-10]; ([total range 0-12].
As additional procedures, tape strips and skin swabs are taken immediately after UV exposures. The material is used for shotgun metagenomic sequencing of microbes and further analysis such as quantitative measures of antimicrobial peptides and urocanic acid levels. Furthermore, suction blisters are produced after MED testing and the last day of photo provocation [Time Frame: At day 3 and 6] to profile the inflammatory milieu of the skin by transcriptomics. The epidermal blister roof is used together with optional skin biopsies (PLE patients only) for various investigations, including H/E and immunohistochemical stainings and messenger ribonucleic acid (mRNA) analysis.
Study Type
Enrollment (Anticipated)
Phase
- Not Applicable
Contacts and Locations
Study Contact
- Name: Peter Wolf, MD
- Phone Number: 80315 0043 316 385
- Email: peter.wolf@medunigraz.at
Study Contact Backup
- Name: Maximilian Zarfl
- Phone Number: 00 43 660 6682953
- Email: maximilian.zarfl@stud.medunigraz.at
Study Locations
-
-
Styria
-
Graz, Styria, Austria, 8036
- Recruiting
- Department of Dermatology, Medical University of Graz
-
Contact:
- Maximilian Zarfl
- Phone Number: 00 43 660 6682953
- Email: maximilian.zarfl@stud.medunigraz.at
-
Contact:
- Peter Wolf
- Phone Number: 031638580315
- Email: peter.wolf@medunigraz.at
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Confirmed diagnosis of PLE by typical patient history, typical histology of skin lesions and/or positive photo provocation test
- Healthy subjects
Exclusion Criteria:
- Presence or history of malignant skin tumors; dysplastic melanocytic nevus syndrome
- Photosensitive diseases such as porphyria, chronic actinic dermatitis, xeroderma
- pigmentosum, basal cell nevus syndrome
- Autoimmune disorders such as lupus erythematosus or dermatomyositis
- Antinuclear antibodies titer over 1:160 within 12 months prior study
- Systemic treatment of steroids and/or immunosuppressive drugs within 4 weeks prior the study start
- Systemic treatment of antibiotics within the last 6 weeks prior study
- Local treatment of anti-microbial treatment in the test field area within the last 6 weeks prior the study
- Systemic treatment of medications/drugs/ that could affect inflammatory responses within 2 weeks prior study
- Allergy on tape strips and/or adhesive material
- Psychiatric disorders
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Prevention
- Allocation: Non-Randomized
- Interventional Model: Parallel Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Polymorphic light eruption patients
PLE patients subjected to MED testing and photoprovocation
|
Administering Octeniderm (octenidine dihydrochloride, 1-propanol, 2- propanol) or 0,9% sodium chloride (as control agent) to the skin
|
Other: Healthy subjects
Normal healthy subjects
|
Administering Octeniderm (octenidine dihydrochloride, 1-propanol, 2- propanol) or 0,9% sodium chloride (as control agent) to the skin
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Quantification of PLE
Time Frame: 1 week
|
determined by PLE score (range, 0-12) of photo provocation results (0 best, 12 worst)
|
1 week
|
Quantification of erythema score (range, 0-4)
Time Frame: 1 week
|
determined by visual and spectroscopic erythema score
|
1 week
|
Quantification of pigmentation (range, 0-4)
Time Frame: 1 week
|
determined by visual and spectroscopic erythema score
|
1 week
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Measurement of multiple cytokines (panel of 96 cytokines)
Time Frame: 1 week
|
determined by transcriptomics
|
1 week
|
Assessment of multiple microbiomes of the skin (quantity and variety)
Time Frame: 1 week
|
determined by metagenomics
|
1 week
|
Measurement of quantity and quality of multiple Antimicrobial peptides (AMP)
Time Frame: 1 week
|
determined by proteomics
|
1 week
|
Measurement of concentration of cis/trans-urocanic acid
Time Frame: 1 week
|
determined by high pressure liquid chromotography (HPLC)
|
1 week
|
Quantification of cellular skin infiltration (T cells, granulocytes and macrophages)
Time Frame: 1 week
|
determined by hematoxylin and eosin (H/E) and immunohistochemical stainings
|
1 week
|
Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Peter Wolf, MD, Medical University of Graz
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Anticipated)
Study Completion (Anticipated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 33-196 ex 20/21
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
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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