Study 3: Minocycline Decreases Microglia Activation

Phase 2

Not yet recruiting

• Conditions: Hypertension
• Interventions: Drug: Minocycline

• Registration Number: NCT02213575
• Lead Sponsor: University of Florida

Brief Summary

This study is a mechanistic study that will enroll 9 subjects who are participating in NCT02133885 (which is designed to evaluate minocycline to test the hypothesis that minocycline treatment would produce antihypertensive effects in drug-resistant neurogenic hypertensive individuals) to test whether the antihypertensive effect of minocycline is associated with a decrease in activated microglia in central nervous system autonomic regions as evidenced by changes in PET and MRI imaging.

Detailed Description

This study will recruit 9 subjects from NCT02133885 who will agree to undergo additional autonomic testing and imaging studies at baseline and after 3-6 months of study treatment. Specialized imaging of the brain using magnetic resonance imaging (MRI) and positron emission tomography (PET) scanning will be conducted at the Montreal Neurological Institute, in Montreal Canada.

Basic Information
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Recruitment & Eligibility
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Study & Design
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Trial Locations

Study Timeline

• Study First Submitted: 2014-08-07
• Study First Submitted QC: 2014-08-07
• Study First Posted: 2014-08-11
• Status Verified: 2023-05
• Last Update Submitted: 2023-05-08
• Last Update Posted: 2023-05-09
• Study Start: 2024-04-15
• Primary Completion: 2025-04-15
• Study Completion: 2025-10-15

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 9

Inclusion Criteria

• Subjects participating in IRB approved protocol #102-2013 will be eligible to participate.
• (For Study 3 Participants only) Willing to travel to Montreal, Canada for specialized imaging of the participant's brain using magnetic resonance imaging (MRI), positron emission tomography (PET) scanning, Autonomic Nervous System Testing and blood drawing- if participant qualifies

Exclusion criteria for control and resistant hypertensive subjects include:

• currently pregnant or have been pregnant in the last 6 months;
• antibiotic treatment within 2 months of study enrollment;
• currently taking a medication (e.g., antibiotic, anti-inflammatory agents, glucocorticoids or other immune modulating medications);
• unwilling to discontinue vitamin or supplements, including probiotics, potentially affecting gut microbiota (vitamins/supplements and medications that possibly affect the gut microbiota should be discontinued for at least 2wks prior to stool collection);
• history of intestinal surgery, inflammatory bowel disease, celiac disease, lactose intolerance, chronic pancreatitis or other malabsorption disorder.

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Exclusion Criteria

Not provided

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Minocycline	Minocycline	Subjects will receive the dose of Minocycline determined to best lower BP and will undergo baseline and week 12-24 follow-up MRI and PET scans for changes in the paraventricular nucleus.

Primary Outcome Measures

Name	Time	Method
PET changes in the paraventricular nucleus	Change in Baseline to 24 weeks	PET changes in the paraventricular nucleus from baseline to 24 weeks. Increased binding in the autonomic brain regions (paraventricular nucleus)
MRI changes in the paraventricular nucleus	Change in Baseline to 24 weeks	MRI changes in the paraventricular nucleus from baseline to 24 weeks. Increased binding in the autonomic brain regions (paraventricular nucleus)

Trial Locations

Locations (1)

UF Health Cardiovascular Clinic; 🇺🇸 Gainesville, Florida, United States