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Completed

NCT Number: NCT06036589

Characterization of Bovine Adrenal Medulla as a Model of Non-histaminergic Itch

With this experiment, the experimenter wish evaluate the role of TRPA1 on non-histaminergic itch induced by BAM8-22

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Key information

Conditions

Itch Pathological Conditions, Signs and Symptoms Pruritus Signs and Symptoms Skin Diseases Skin Manifestations Skin and Connective Tissue Diseases

Age range

18 year–60 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Aalborg University

Aalborg, 9000, Denmark

About this study

With this experiment, the experimenter wish evaluate the role of TRPA1 on non-histaminergic itch induced by BAM8-22 2 (Bovine Adrenal Medulla), which is found naturally in the human body and which has proved to evoke itch. To evaluate the role of TRPA1 it will be used a TRPA1 agonist

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Healthy men and women
  • 18-60 years
  • Speak and understand English

Exclusion criteria

  • Pregnancy or lactation
  • Drug addiction defined as any use of cannabis, opioids or other drugs
  • Previous or current history of neurological, dermatological, immunological musculoskeletal, cardiac disorder or mental illnesses that may affect the results (e.g. neuropathy, muscular pain in the upper extremities, etc.)
  • Moles, wounds, scars or tattoos in the area to be treated or tested
  • Lack of ability to cooperate •
  • Current use of medications that may affect the trial such as antihistamines and pain killers.
  • Skin diseases
  • Consumption of alcohol or painkillers 24 hours before the study days and between these
  • Acute or chronic pain
  • Participation in other trials within 1 week of study entry (4 weeks in the case of pharmaceutical trials)

Treatment and study plan

CA and BAM8-22

Drug

CA (tran-cinnamaldheyde) solution (in ethanol 5%) application and BAM8-22 with inactivate cowhage spicules 20 µl of BAM8-22 will be applied to a previously determined area on the volar forearm using inactivate cowhage spicules

Vehicle and BAM8-22 application

Drug

Vehicle (ethanol) application and BAM8-22 with inactivate cowhage spicules 20 µl of BAM8-22 will be applied to a previously determined area on the volar forearm using inactivate cowhage spicules

CA

Drug

CA (tran-cinnamaldheyde) solution (in ethanol 5%) application to a previously determined area on the volar forearm

Vehicle

Drug

Vehicle (ethanol) application and inactivate cowhage spicules will be applied to a previously determined area on the volar forearm

Primary outcomes

  1. superficial blood perfusion

    Time frame: change from baseline, up to 10 minutes after the application

    is measured by a speckle contrast imager (FLPI, Moor Instruments, England)

  2. Warm Detection Threshold

    Time frame: change from baseline, up to 10 minutes after the application

    the tests for thermal sensation will all be performed using a PATHWAY ATS (Medoc Ltd, Israel) thermal sensory testing device

  3. Heat Pain threshold

    Time frame: change from baseline, up to 10 minutes after the application

    the tests for thermal sensation will all be performed using a PATHWAY ATS (Medoc Ltd, Israel) thermal sensory testing device

  4. Cold Detection Threshold

    Time frame: change from baseline, up to 10 minutes after the application

    the tests for thermal sensation will all be performed using a PATHWAY ATS (Medoc Ltd, Israel) thermal sensory testing device

  5. Cold Pain threshold

    Time frame: change from baseline, up to 10 minutes after the application

    the tests for thermal sensation will all be performed using a PATHWAY ATS (Medoc Ltd, Israel) thermal sensory testing device

  6. Pain supra-threshold heat Stimuli

    Time frame: change from baseline, up to 10 minutes after the application

    the tests for thermal sensation will all be performed using a PATHWAY ATS (Medoc Ltd, Israel) thermal sensory testing device

  7. hyperknesis

    Time frame: change from baseline, up to 10 minutes after the application

    measured by using a mildy pruritic, non-painful von Frey filaments of a predetermined intensity (5-30 milliNewton of force). participants will rate the itch sensation induced by stimuli with von Frey filaments on an numerical rating scale from 0 to 10

  8. mechanical pain threshold

    Time frame: change from baseline, up to 10 minutes after the application

    is performed using a pin-prick set (Aalborg University). The set consists of 8 needles each having a diameter of 0,6 mm and different force applications. it will be determinate a threshold corresponding to the force of the pinprick (mN) from which participants start to feel pain

  9. mechanical pain sensitivity

    Time frame: change from baseline, up to 10 minutes after the application

    is performed using a pin-prick set (Aalborg University). The set consists of 8 needles each having a diameter of 0,6 mm and different force applications

  10. itch rating

    Time frame: change from baseline, up to 10 minutes after the application

    the subject will rate the itch for 10 minutes by using a visual analog scale (VAS) on a tablet. this scale goes from 0 to 100. 0 indicates "no itch" and 100 indicates "worst imaginable itch"

Secondary outcomes

  1. pain rating

    Time frame: change from baseline, up to 10 minutes after the application

    the subject will rate the pain for 10 minutes by using a visual analog scale (VAS) on a tablet. this scale goes from 0 to 100. 0 indicates "no pain" and 100 indicates "worst imaginable pain

Sponsors and collaborators

Lead sponsor

Aalborg University

Other

Registry information

Official study title

Characterization of Bovine Adrenal Medulla (BAM8-22) as a New Surrogate Model of Non-histaminergic Itch

Important dates

Study start
2022
Primary completion
2022
Study completion
2022
First posted
Sep 14, 2023
Registry last updated
Sep 14, 2023

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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