Human Pain Atlas for Sensory Neurons

NCT07740681 | Not Yet Recruiting

• 1 other identifier: 370701
• Study Type: observational
• Target: 200
• Locations: 0 countries
• Sites: N/A

Brief Summary

This study aims to improve our understanding of how the nerves that detect and transmit pain signals work in humans. Chronic pain affects millions of people worldwide and can be difficult to treat because the biological mechanisms underlying pain are not yet fully understood. By gaining a better understanding of the human pain system, this research may help guide the development of more effective and personalised treatments for chronic pain in the future. The study will investigate sensory neurons, which are specialised nerve cells that detect sensations such as touch, temperature, and injury. We will examine both how these nerve cells respond to stimulation and the genes they express. By linking the activity of individual nerve cells with their molecular characteristics, we hope to identify specific types of sensory neurons that may contribute to chronic pain conditions. To achieve this, we will use a technique called microneurography. This involves inserting a very fine recording electrode into a peripheral nerve to measure the activity of individual nerve fibres directly in the body. These recordings will be performed in healthy volunteers and in patients. The information obtained will be combined with laboratory-based studies conducted by collaborators in Germany and France, allowing us to relate detailed biological findings to the experience of pain in humans. The results of this research will provide a detailed map of the human sensory nervous system and improve our understanding of how pain-signalling neurons function in health and disease. This knowledge may support the development of future treatments for chronic pain.

Conditions

Chronic Pain

Keywords

Chronic pain; Microneurography; Human Sensory Atlas

Outcome Measures

Primary Outcomes (1)

• Assessment of molecular and functional mechanisms underlying chronic neuropathic pain

  To refine neuron subtype classifications by developing new stimulation paradigms for precise classification of neuronal subgroups involved in chronic pain. To specify underlying mechanisms of the unmyelinated axonal membrane excitability.

  Day 1

Secondary Outcomes (2)

• To bridge basic and clinical research

  Day 1

• Chronic pain database

  Day 1

Study Arms (2)

Chronic pain

Participants suffering from chronic neuropathic pain.

Diagnostic Test: Microneurography

Healthy volunteers

Healthy volunteers, defined by no clinically relevant abnormalities identified by a detailed medical history and a full physical examination.

Diagnostic Test: Microneurography

Interventions

Microneurography DIAGNOSTIC_TEST

Electrophysiological technique that can record action potentials from individual peripheral nerve axons in humans. The test will be used to identify/rule out small nerve fibre dysfunction and measures of axonal excitability.

Chronic pain; Healthy volunteers

Eligibility Criteria

• Age: 18 Years - 75 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)
• Sampling Method: Non-Probability Sample

Study Population

100 patients with ongoing neuropathic pain in the context of a possible small fibre neuropathy or C-fibre dysfunction. 100 healthy volunteers.

You may qualify if:

• Between 18 and 75 years of age.
• Male and female.
• In the capacity to understand and sign an Informed Consent Form.
• Willing and able to comply with scheduled visits and study procedures.
• Criteria for chronic pain participants:
• Ongoing neuropathic pain in the context of a possible small fibre neuropathy or C-fibre dysfunction
• Criteria for healthy participants:
• Healthy is defined as no clinically relevant abnormalities identified by a detailed medical history and a full physical examination.

You may not qualify if:

• Previous diagnosis of an established autoimmune condition or dermatological conditions affecting skin afferents (e.g. psoriasis, lupus, vitiligo, dermatitis…).
• Application of local anaesthetics or steroid injections within 35 days prior to the microneurography visit.
• Unsuitable anatomy of the superficial peroneal nerve (i.e. nerve cannot be seen or palpated at the dorsum of the foot/ankle)
• Infection, disease (dermatologic or vascular), ongoing pain or recent trauma or surgery that may affect study assessments.
• Current use of anticoagulant therapy.

Sponsors & Collaborators

• King's College Hospital NHS Trust: lead

MeSH Terms

Conditions

Chronic Pain

Condition Hierarchy (Ancestors)

Pain; Neurologic Manifestations; Signs and Symptoms; Pathological Conditions, Signs and Symptoms

Central Study Contacts

Ana Ribeiro, MSc

CONTACT

+447768974020; anaribeiro@nhs.net

Jordi Serra, MD

CONTACT

jserra@nhs.net

Study Design

• Study Type: observational
• Observational Model: OTHER
• Time Perspective: PROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: July 13, 2026
• First Posted: July 31, 2026
• Study Start (Estimated): September 1, 2026
• Primary Completion (Estimated): September 1, 2028
• Study Completion (Estimated): September 1, 2029
• Last Updated: July 31, 2026

Record last verified: 2026-07