NCT03917420

Quantification of Estradiol's Impact on Nucleotides in Cellular Populations of the Lower GI Tract

Quantification of Estradiol's Impact on Nucleotides in Different Cellular Populations of the Lower Gastrointestinal Tract

• Status: Completed
• Phase: Phase 1
• Study type: Interventional
• Enrollment: 10 (actual)
• Sponsor: University of North Carolina, Chapel Hill · Academic / Other
• Sex: Female
• Age: 18 Years – 49 Years
• Healthy volunteers: Accepted

Summary

Purpose: To Assess the impact of high and low in vivo estradiol exposure on PrEP (Pre-exposure prophylaxis) nucleotide concentrations in different cellular populations of the lower GI (gastrointestinal) tract and to quantify the relationship between estradiol, progesterone, and testosterone on PrEP nucleotide concentrations in rectal and peripheral blood mononuclear cells. As well as the relationship between estradiol, progesterone, and testosterone on PrEP concentrations in plasma. Participants: Healthy, cisgender female, volunteers, aged 18-49 inclusive on the date of screening with an intact gastrointestinal system and regular menstrual cycle. Procedures (methods): Participants will take a single daily dose of study drug for five days before each sampling visit. The visits will be scheduled during the early follicular phase of the menstrual cycle (approximately days 2-5 after the first day of menses, Visit 1) when estradiol is predicted to be the lowest and the late follicular phase (approximately days 12-15 after the first day of menses, Visit 2) when estradiol is predicted to be highest. Samples of blood, rectal cells, and rectal tissue will be collected at both Visits 1 and 2. All participants will complete a follow-up safety visit within 14 days of completing study sampling.

Detailed description

Participants will be enrolled, and sampling visits will be scheduled to correspond with their menstrual cycles. Five days prior to the first scheduled sampling visit, participants will come to the clinic to have a repeat urine pregnancy test performed to verify eligibility. After verification, participants will be given a single dose of the study medication, Truvada®. Study staff will witness the dose and assess for any adverse reactions post dose. Participants will be sent home with a supply of 4 additional doses of Truvada® for them to take at scheduled times for the next 4 days with study staff observing via video call. Study staff will assess for adverse events during each dosing call. Starting 72 hours before each sampling visit, participants will be required to switch to a low fiber diet and abstain from inserting anything rectally. Twelve hours prior to each sampling visit, participants will be required to abide by a clear liquid diet. Participants will be seen as an outpatient at the Clinical Translational Research Center (CTRC) at University of North Carolina at Chapel Hill (UNC) for these sampling visits. At these visits, participants will have blood samples drawn to measure peripheral blood mononuclear cells and serum hormone concentrations. Participants will also have rectal cells collected via cytobrush and rectal tissue collected via rectal biopsy. After all samples have been collected, participants will be evaluated for adverse events and be discharged. Within 14 days of completion of the second sampling visit, for a follow-up visit. At this visit, blood will be obtained to check safety labs.

Conditions

• HIV/AIDS

Interventions

Type	Name	Description
DRUG	Tenofovir 300Mg Oral Tablet	Once daily dose of the combo tab x 5 days pre-sampling
DRUG	Emtricitabine 200 MG	Once daily dose of the combo tab x 5 days pre-sampling

Timeline

• Start date: 2019-03-26
• Primary completion: 2019-09-04
• Completion: 2019-09-04
• First posted: 2019-04-17
• Last updated: 2023-04-12
• Results posted: 2023-04-12

Locations

1 site across 1 country: United States

Regulatory

• FDA-regulated drug study