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Angiotensin-(1-7) Cardiovascular Effects in Aging

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.
 
ClinicalTrials.gov Identifier: NCT05301192
Recruitment Status : Recruiting
First Posted : March 29, 2022
Last Update Posted : May 6, 2023
Sponsor:
Collaborator:
National Heart, Lung, and Blood Institute (NHLBI)
Information provided by (Responsible Party):
Amy Arnold, Milton S. Hershey Medical Center

Study Description
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Brief Summary:
Aging is an independent risk factor for developing hypertension and cardiovascular disease; however, the mechanisms underlying age-related cardiovascular disease remain poorly understood. One hallmark of aging is an increase in sympathetic nervous system activity, which can decrease the number and/or sensitivity of β2 adrenergic receptors to reduce dilation of blood vessels and increase blood pressure. Identifying new targets to restore vascular β2 adrenergic receptor signaling may help reduce cardiovascular risk in aging. This study will test the hypothesis that angiotensin-(1-7), a protective hormone of the renin-angiotensin system, can reduce cardiovascular sympathetic outflow and blood pressure and improve endothelial function in older healthy humans.

Condition or disease Intervention/treatment Phase
Aging Drug: Angiotensin-(1-7) Drug: Saline Early Phase 1

Detailed Description:
A randomized, double blind, placebo-controlled, crossover study will be conducted to determine if acute intravenous angiotensin-(1-7) infusion can reduce cardiovascular sympathetic tone and blood pressure and improve the function of blood vessels in older healthy individuals. This is an outpatient study that requires a screening visit, and if eligible, two study visits separated by at least one week in the Clinical Research Center within the Penn State Milton S. Hershey Medical Center. The study visits will include intravenous infusion of angiotensin-(1-7) or saline for approximately two hours, starting with increasing doses and holding at a steady-state dose. Endothelial function will be measured and blood samples and endothelial cells collected at baseline and at the end of infusions. Blood pressure, heart rate, and muscle sympathetic nerve activity via microneurography will be measured throughout the study. Each study visit will last approximately 4 hours.
Study Design
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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 26 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Basic Science
Official Title: Angiotensin-(1-7) Cardiovascular Effects in Aging
Actual Study Start Date : December 9, 2022
Estimated Primary Completion Date : June 1, 2024
Estimated Study Completion Date : December 1, 2024

Resource links provided by the National Library of Medicine


Arms and Interventions
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Arm Intervention/treatment
Experimental: Angiotensin-(1-7)
Participants will receive intravenous angiotensin-(1-7) at one study visit for 110 minutes. Angiotensin-(1-7) will be given in escalating doses of 2 ng/kg/min, 4 ng/kg/min, and 8 ng/kg/min. Each of these doses will be infused for 10 minutes. Following the dose escalation, angiotensin-(1-7) will be given at 8 ng/kg/min for an additional 80 minutes. Infusion rates will be calculated for each participant based on body mass.
 Drug: Angiotensin-(1-7)
This is a biologically active endogenous angiotensin peptide that may play an important role in regulation of blood pressure.
Other Name: Angiotensin I/II (1-7) Acetate
Placebo Comparator: Saline
Participants will receive intravenous saline at one study visit for 110 minutes total. The volume of saline will match the volume of angiotensin-(1-7) infused. Infusion rates will be calculated for each participant based on body mass.
 Drug: Saline
Saline will be used as the placebo comparator.
Other Names:
  • Normal saline
  • 0.9% sodium chloride


Outcome Measures
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Primary Outcome Measures :
  1. Change in Muscle Sympathetic Nerve Burst Rate [ Time Frame: 110 minutes ]
    Muscle sympathetic nerve burst rate will be measured continuously using peroneal nerve microneurography during angiotensin-(1-7) versus saline infusion.


Secondary Outcome Measures :
  1. Change in Muscle Sympathetic Nerve Burst Incidence [ Time Frame: 110 minutes ]
    Muscle sympathetic nerve burst incidence will be measured continuously using peroneal nerve microneurography during angiotensin-(1-7) versus saline infusion.

  2. Change in Muscle Sympathetic Nerve Amplitude [ Time Frame: 110 minutes ]
    Muscle sympathetic nerve amplitude will be measured continuously using peroneal nerve microneurography during angiotensin-(1-7) versus saline infusion.

  3. Change in Muscle Sympathetic Nerve Total Activity [ Time Frame: 110 minutes ]
    Muscle sympathetic nerve total activity will be measured continuously using peroneal nerve microneurography during angiotensin-(1-7) versus saline infusion.

  4. Change in Brachial Artery Diameter [ Time Frame: 110 minutes ]
    A blood pressure cuff will be inflated to a suprasystolic pressure for 5 minutes then deflated. Brachial artery diameter will be measured continuously before, during, and after cuff inflation using duplex ultrasound at baseline and at the end of angiotensin-(1-7) versus saline infusion.

  5. Change in Systolic and Diastolic Blood Pressure [ Time Frame: 110 minutes ]
    Blood pressure will be measured continuously with a finger and arm cuff during angiotensin-(1-7) versus saline infusion.

  6. Change in Heart Rate [ Time Frame: 110 minutes ]
    Heart rate will be measured continuously by electrocardiogram during angiotensin-(1-7) versus saline infusion.

  7. Change in Heart Rate Variability [ Time Frame: 110 minutes ]
    Heart rate variability will be calculated from the continuous electrocardiogram recordings obtained during angiotensin-(1-7) versus saline infusion.

  8. Change in Plasma Catecholamines [ Time Frame: 110 minutes ]
    Circulating catecholamine levels will be measured in blood samples obtained at baseline and at the end of angiotensin-(1-7) versus saline infusion.


Other Outcome Measures:
  1. Change in Angiotensin II [ Time Frame: 110 minutes ]
    Plasma angiotensin II levels will be measured in blood samples obtained at baseline and at the end of angiotensin-(1-7) versus saline infusion.

  2. Change in Angiotensin-(1-7) [ Time Frame: 110 minutes ]
    Plasma angiotensin-(1-7) levels will be measured in blood samples obtained at baseline and at the end of angiotensin-(1-7) versus saline infusion.

  3. Change in Renin Activity [ Time Frame: 110 minutes ]
    Plasma renin activity will be measured in blood samples obtained at baseline and at the end of angiotensin-(1-7) versus saline infusion.

  4. Change in Aldosterone [ Time Frame: 110 minutes ]
    Plasma or serum aldosterone levels will be measured in blood samples obtained at baseline and at the end of angiotensin-(1-7) versus saline infusion.


Eligibility Criteria
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Ages Eligible for Study:   65 Years to 80 Years   (Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • Men and women of all races and ethnicities
  • Capable of giving informed consent
  • Fluent in written and spoken English
  • Age 65-80 years
  • Body mass index (BMI) between 18.5 and 30 kg/m2
  • Normotensive defined as seated blood pressure <130/80 mmHg and without hypertensive medications
  • Satisfactory history and physical exam

Exclusion Criteria:

  • Age < 65 or > 80 years
  • Women who are pregnant, nursing, or taking hormone replacement therapy
  • Decisional impairment
  • Prisoners
  • Current or recent (less than 6 months) recreational drug history or excessive alcohol abuse history (greater than 14 drinks per week)
  • Current smokers
  • Highly trained athletes
  • Evidence of type I or type II diabetes (fasting glucose > 126 mg/dL or use of anti-diabetic medications)
  • Hypertension or history of serious cardiovascular disease (e.g., myocardial infarction within 6 months, symptomatic coronary artery disease, presence of angina pectoris, significant arrhythmia, congestive heart failure, deep vein thrombosis, pulmonary embolism, second or third degree heart block, mitral valve stenosis, aortic stenosis, hypertrophic cardiomyopathy) or cerebrovascular disease (e.g., cerebral hemorrhage, stroke, transient ischemic attack).
  • History or presence of immunological or hematological disorders
  • Impaired hepatic function [aspartate aminotransferase (AST) or alanine aminotransferase (ALT) levels >2 times upper limit of normal range]
  • Impaired renal function (serum creatinine >2.0 mg/dl)
  • Anemia
  • Taking drugs known to influence sympathetic activity (e.g. serotonin-norepinephrine reuptake inhibitors, norepinephrine transporter inhibitors, stimulants).
  • Treatment with anticoagulants (e.g. warfarin)
  • Treatment with chronic systemic glucocorticoid therapy (>7 consecutive days in 1 month in the 1-month preceding the study)
  • Treatment with any investigational drug in the 1-month preceding the study
  • Known allergy or contraindication to angiotensin converting enzyme inhibitors or angiotensin receptor blockers, both of which increase endogenous angiotensin-(1-7) levels as part of their mechanism of action
  • Inability to give, or withdraw, informed consent
Contacts and Locations
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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 ClinicalTrials.gov identifier (NCT number): NCT05301192


Contacts
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Contact: Aimee Cauffman, RN 717-531-1617 acauffman@pennstatehealth.psu.edu
Contact: Amanda Miller, PhD 717-531-7676 aross1@pennstatehealth.psu.edu

Locations
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United States, Pennsylvania
Penn State Milton S. Hershey Medical Center Recruiting
Hershey, Pennsylvania, United States, 17033
Contact: Amy C Arnold, PhD    717-531-3674    aarnold5@pennstatehealth.psu.edu   
Sub-Investigator: Urs A Leuenberger, MD         
Sub-Investigator: Amanda J Miller, PhD         
Sub-Investigator: Aimee Cauffman, RN         
Sub-Investigator: Cheryl Blaha, RN         
Sub-Investigator: Jian Cui, PhD         
Sponsors and Collaborators
Milton S. Hershey Medical Center
National Heart, Lung, and Blood Institute (NHLBI)
Investigators
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Principal Investigator: Amy C Arnold, PhD Penn State Medical Center
More Information
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Responsible Party: Amy Arnold, Associate Professor of Neural and Behavioral Sciences, Milton S. Hershey Medical Center
ClinicalTrials.gov Identifier: NCT05301192    
Other Study ID Numbers: STUDY 17401
K99HL159272 ( U.S. NIH Grant/Contract )
First Posted: March 29, 2022    Key Record Dates
Last Update Posted: May 6, 2023
Last Verified: May 2023
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Amy Arnold, Milton S. Hershey Medical Center:
cardiovascular
blood pressure
autonomic nervous system
renin-angiotensin system
endothelial
Additional relevant MeSH terms:
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Angiotensin I (1-7)
Antihypertensive Agents
Vasodilator Agents