COVID-19 is an emerging, rapidly evolving situation.
Get the latest public health information from CDC:

Get the latest research information from NIH: Menu

Study 1: Effect of Minocycline Treatment on Drug-Resistant Hypertensive Patients

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT02133872
Recruitment Status : Recruiting
First Posted : May 8, 2014
Last Update Posted : June 5, 2019
National Heart, Lung, and Blood Institute (NHLBI)
Information provided by (Responsible Party):
University of Florida

Brief Summary:

Hypertension (HTN) is the single most prevalent risk factor for cardiovascular disease, diabetes, obesity and metabolic syndrome. Recent American Heart Association (AHA) statistics indicate that one-third of all adults in the United States of America suffer from HTN. Despite advances in life style modification and multi-drug therapies, 20-30% of all hypertensive patients remain resistant.

These individuals exhibit autonomic dysregulation due to elevated sympathetic activity and norepinephrine spillover, and low parasympathetic activity. It is generally accepted that this uncontrolled, resistant HTN is primarily "neurogenic" in origin, involving over activity of the sympathetic nervous system that initiates and sustains HTN. A surgical approach such as the recently developed "Simplicity Catheter" assisted renal denervation remains one of the few options available to these patients. Thus, a mechanism-based breakthrough is imperative to develop novel strategies to prevent and perhaps eventually cure neurogenic hypertension (NH). This study is designed to evaluate a low and high dose of minocycline to test the hypothesis that minocycline treatment would produce antihypertensive effects in drug-resistant neurogenic hypertensive individuals. Minocycline has been selected because of its demonstrated effects on inhibiting microglial activation and its ability to penetrate the blood brain barrier. There is no other compound available that is safer and displays specificity better than Minocycline in inhibiting microglial activation. Thus, the potential therapeutic benefits of this inexpensive, well tolerated, already FDA-approved drug that has minimal side effects would be enormous.

Condition or disease Intervention/treatment Phase
Hypertension Drug: Minocycline 100mg Group Drug: Minocycline 200mg Group Phase 1

Detailed Description:

One hundred seventy-five (175) subjects who will be randomized to receive either Minocycline 100 mg or 200 mg b.i.d. (twice a day). At baseline, subjects will undergo blood tests (lipid panel, high sensitivity-C reactive protein, high sensitivity troponin, glucose, metabolic profile, lipid panel, Cystatin C, albumin and flow cytometry). Peripheral blood mononuclear cells will be isolated and used to generate human induced pluripotent stem cells (iPSCs) which will be used for further mechanism studies.

In addition to blood collection, a physical exam will be conducted and office systolic blood pressure (BP), diastolic blood pressure (DBP) and pulse pressure (PP) will be recorded. Patients will also be fitted with an ambulatory blood pressure monitor (ABPM) system. Patients will wear the ABPM for 24 hours at which point they will mail the monitor back to research personnel. A week later, a second ABPM baseline reading will be conducted as patients will return to the clinic to be fitted again with the ABPM. At this visit, the study drug will be dispensed and patients will be instructed to start the study medication after completing the 24- hour ABPM monitoring period. After this visit, patients will be asked to return every month till the end of the study at 6 months.

Monthly visits (1, 2, 3, 4, 5 and 6 month visits), will include a brief physical examination and an assessment of medication compliance and tolerance. One tablespoon of blood will be drawn for flow cytometry analysis and iPSCs isolation at the baseline, 3 and 6 month visit only. Study drug will be dispensed and measurement of SBP, DBP, PP and other vital signs will also be completed. Office BP readings will be taken in a seated position after 5 minutes of rest according to Joint National Committee VII Guidelines. At baseline, BP will be measured at each arm, and the arm with the higher BP will be used for all subsequent readings. Averages of the triplicate measures will be calculated and used for analysis. At baseline and each followup visit, patients will be asked to wear the ABPM for 24 hours. Subjects will mail the cuff back to research personnel when completed. ABPM will be performed using an oscillometric Spacelabs 90207 monitor (Spacelabs Healthcare, Issaqua, WA) with readings taken every 30 minutes in daytime and every 60 minutes at nighttime. ABPM readings will be averaged for, daytime (8 AM to 5 PM), and nighttime (10 PM to 7 AM). Patients will be assessed while adhering to their usual diurnal activity and nocturnal sleep routine. The antihypertensive drugs, and their doses, used at each visit will be recorded on standardized forms along with any reports of adverse experiences known to occur with the drugs used (e.g. lightheadedness, dizziness, syncope, etc.).

Only at the final visit, the same blood tests at baseline will be repeated. When the patients complete the 6 months of treatment, come in for their final visit, and return the ABPM monitor, their participation in the trial will be considered as complete.

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 101 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Angiotensin and Neuroimmune Activation in Hypertension
Study Start Date : October 2014
Estimated Primary Completion Date : May 2020
Estimated Study Completion Date : May 2020

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Active Comparator: Minocycline 100mg Group
Subjects will be randomized to receive Minocycline 100mg.
Drug: Minocycline 100mg Group
Subjects will be randomized to receive Minocycline 100mg

Active Comparator: Minocycline 200mg Group
Subjects will be randomized to receive Minocycline 200mg
Drug: Minocycline 200mg Group
Subjects will be randomized to receive Minocycline 200mg.

Primary Outcome Measures :
  1. Reduction in High Blood Pressure [ Time Frame: 52 weeks ]
    Reduction in anti-hypertensive medications

Secondary Outcome Measures :
  1. Renal function changes [ Time Frame: 52 weeks ]
    Lab results

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   18 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No


  • Greater than 18 and less than 80 years of age;
  • On stable medication regimen
  • Full-tolerated doses of 3 or more antihypertensive medications of different classes, one of which must be a diuretic (with no changes for a minimum of two weeks prior to screening) that is expected to be maintained without changes for at least 3 months.
  • The individual agrees to have all study procedures performed
  • Willing to provide written consent


  • eGFR of < 45mL/min/1.73m2, using the MDRD calculation.
  • More than one in-patient hospitalization for an antihypertensive crisis within the year.
  • More than one episode(s) of orthostatic hypotension (reduction of SBP of ≥ 20mmHg of diastolic blood pressure (DBP) of ≥ 10mmHg within 3 minutes of standing).
  • Known hypersensitivity or contraindication to Minocycline or other tetracycline.
  • Evidence of alcoholism or drug abuse;

    • Concurrent severe disease (such as neoplasm or HIV positive or AIDS).
    • Women of childbearing potential

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02133872

Layout table for location contacts
Contact: Dana Leach, DNP 352-273-8933
Contact: Sarah Long, RN 352-273-8933

Layout table for location information
United States, Florida
UF Health Cardiovascular Clinic Recruiting
Gainesville, Florida, United States, 32610
Contact: Dana Leach, DNP    352-273-8933   
Sub-Investigator: Mohan Raizada, PhD         
Sponsors and Collaborators
University of Florida
National Heart, Lung, and Blood Institute (NHLBI)
Layout table for investigator information
Principal Investigator: Carl Pepine, MD University of Florida

Layout table for additonal information
Responsible Party: University of Florida Identifier: NCT02133872    
Other Study ID Numbers: IRB2015005 -N
RO1HL3361028 ( Other Identifier: NHLBI )
2013-00102 Study 1 ( Other Identifier: UF IRB ID )
1R01HL132448-01 ( U.S. NIH Grant/Contract )
First Posted: May 8, 2014    Key Record Dates
Last Update Posted: June 5, 2019
Last Verified: June 2019
Keywords provided by University of Florida:
Resistent Hypertension
Additional relevant MeSH terms:
Layout table for MeSH terms
Vascular Diseases
Cardiovascular Diseases
Anti-Bacterial Agents
Anti-Infective Agents