External Nitric Oxide Measurement Through SNO Degradation

Does a Flashlight Used to Detect Pet Biological Fluids on Human Skin and Other Surfaces Increase Gas Phase Nitric Oxide Levels?

In this study, we aim to explore the feasibility of a novel, noninvasive SNO assay to acquire physiological SNO quantification from the human ear, forehead, or hands and test this new method of analysis. This study aims to help with the currently cumbersome and invasive procedures used to measure SNOs in the body. The proposed activities do not unnecessarily duplicate previous experiments.

Study Overview

• Status: Enrolling by invitation
• Conditions: Healthy; Unconscious
• Intervention / Treatment: Device: Alonefire SV003 10W 365nm UV Flashlight

Detailed Description

S-nitrosylation is the covalent attachment of a nitric oxide group to cystine thiol within a protein to form an S-nitrosothiol (SNO); it has diverse regulatory roles in all mammalian cells and thus operates as a fundamental mechanism for cellular signaling and accounts for a large part of nitric oxide activity. Though SNOs are relevant to many biological disciplines like neuronal, muscular, respiratory, and cardiovascular biology, currently there is no way to measure SNOs that is both easy to use in a clinical setting and accurate in detecting low concentrations; detection is challenging due to the labile nature of the molecules. Low or high concentrations of these molecules could be vital indicators of incoming dangerous issues in the body. A system to easily and accurately measure SNOs could prove useful in preventative treatments. Ultra Violet (UV) light can break SNOs and can be used to measure nitric oxide release, but this method is not fully developed and further research is needed on the potential effect for UV to measure nitric oxide release.

• Study Type: Interventional
• Enrollment (Estimated): 100
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • Indiana
    • Indianapolis, Indiana, United States, 46202
      • Riley Hospital for Children
    • Indianapolis, Indiana, United States, 46202
      • Wells Center for Pediatric Research

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 75 years (Child, Adult, Older Adult)
• Accepts Healthy Volunteers: Yes

Study Population

Study sample will consist of healthy individuals. Subjects may participate if they meet the following criteria:

°Adult males or females age ≥ 1 day ≤ 75 years at time of enrollment

Description

Inclusion Criteria

• Adult males or females age ≥ 1 day and ≤ 75 years at time of enrollment

Exclusion Criteria

• Subjects meeting the following criteria will be excluded:
• Smokers.
• Any chronic skin conditions.
• Pregnant.
• Subjects that are unable or unwilling to cooperate with specimen collection.
• Subjects with diagnosis of any medical condition that in the investigator's opinion would make them unsuitable for study participation.
• (for subjects ≥ 18) Subjects that lack the capacity to consent for themselves.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Healthy Volunteers; Study will enroll to test the assay

Device: Alonefire SV003 10W 365nm UV Flashlight; Investigator will use a Nitric Oxide Analyzer while attached to a small suction port on the subject's ear lobe to be tested for Nitric Oxide. After getting the baseline assay, the investigator will shine a low-intensity UV Flashlight (Alonefire SV003 10W 365nm UV Flashlight) at the ear lobe for 10 seconds, repeated three times at 20 second intervals, to determine if there is photobleaching. Then the assay will then be performed on the opposite ear lobe. Fifteen minutes after the third UV flashlight exposure, the investigator will collect air from the subject's ear during photolysis into a 20mL glass syringe (once from each ear). Fifteen minutes after the third UV flashlight exposure, the investigator will collect air from the subject's ear during photolysis into a 20mL glass syringe (once from each ear). The subject and the investigator will wear UV goggles during the experiment.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in Nitric Oxide during UV light exposure	NO evolved during UV light exposure from the human ear lobe, hand or forehead.	30 minutes

Collaborators and Investigators

• Sponsor: Indiana University
• Investigators: Principal Investigator: Nadzeya Marozkina, PhD, MD, Indiana University School of Medicine

Publications and helpful links

General Publications

• Straub AC, Lohman AW, Billaud M, Johnstone SR, Dwyer ST, Lee MY, Bortz PS, Best AK, Columbus L, Gaston B, Isakson BE. Endothelial cell expression of haemoglobin alpha regulates nitric oxide signalling. Nature. 2012 Nov 15;491(7424):473-7. doi: 10.1038/nature11626. Epub 2012 Oct 31.
• Marozkina NV, Gaston B. Nitrogen chemistry and lung physiology. Annu Rev Physiol. 2015;77:431-52. doi: 10.1146/annurev-physiol-021113-170352.
• Marozkina NV, Gaston B. S-Nitrosylation signaling regulates cellular protein interactions. Biochim Biophys Acta. 2012 Jun;1820(6):722-9. doi: 10.1016/j.bbagen.2011.06.017. Epub 2011 Jun 24.
• Palmer LA, Gaston B. S-nitrosothiol assays that avoid the use of iodine. Methods Enzymol. 2008;440:157-76. doi: 10.1016/S0076-6879(07)00809-9.

Study record dates

Study Major Dates

• Study Start (Actual): May 10, 2021
• Primary Completion (Estimated): December 30, 2025
• Study Completion (Estimated): December 30, 2025

Study Registration Dates

• First Submitted: April 29, 2021
• First Submitted That Met QC Criteria: May 25, 2021
• First Posted (Actual): May 26, 2021

Study Record Updates

• Last Update Posted (Actual): October 30, 2023
• Last Update Submitted That Met QC Criteria: October 26, 2023
• Last Verified: October 1, 2023

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Nervous System Diseases; Neurologic Manifestations; Neurobehavioral Manifestations; Consciousness Disorders; Unconsciousness
• Other Study ID Numbers: 10839

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

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