Effects of Pioglitazone Treatment on Sympathetic Nervous System Function in Metabolic Syndrome Obesity

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. Read our disclaimer for details. Identifier: NCT00408850
Recruitment Status : Unknown
Verified January 2013 by Nora E. Straznicky, Baker Heart Research Institute.
Recruitment status was:  Recruiting
First Posted : December 7, 2006
Last Update Posted : January 17, 2013
National Heart Foundation, Australia
Information provided by (Responsible Party):
Nora E. Straznicky, Baker Heart Research Institute

Brief Summary:

An abdominal distribution of fat is associated with the greatest heart disease risk, because commonly, several risk factors of metabolic origin cluster in these individuals. When this occurs the condition is called the 'metabolic syndrome'.

Increased activity of the sympathetic nervous system resulting in enhanced release of the stress hormone 'noradrenaline', may be one mechanism by which adverse cardiovascular and metabolic sequela of the metabolic syndrome might be mediated. Impaired insulin action may be one factor contributing to increased noradrenaline release.

The aim of this Study is to determine whether treatment with a drug called pioglitazone which is known to improve insulin action, results in reduced sympathetic nervous system activity and stress hormone release when compared to treatment with a dummy drug (placebo).

Condition or disease Intervention/treatment Phase
Metabolic Syndrome Drug: Pioglitazone Drug: sugar pill Phase 3

Detailed Description:

The rapidly growing burden of obesity together with a population that is becoming older raises the importance of effective strategies for the primary prevention and treatment of the metabolic syndrome in order to combat the epidemic of type 2 diabetes and to reduce the increased risk of cardiovascular mortality.

Increased sympathetic nervous system activity may participate in the pathogenesis and complications of the metabolic syndrome. This Study will use a randomised controlled design to evaluate the effects of pioglitazone treatment on sympathetic activity in middle-aged subjects with the metabolic syndrome.The results will generate new information on the neuroadrenergic effects of thiazolidinediones in this clinical setting. This is relevant to the understanding of the pathophysiology of the metabolic syndrome and to its clinical management.

Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 44 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Treatment
Official Title: Mechanisms of Sympathetic Overactivity in the Metabolic Syndrome: Effects of Reversing Insulin Resistance by Drug Treatment
Study Start Date : November 2008
Estimated Primary Completion Date : February 2013
Estimated Study Completion Date : February 2013

Arm Intervention/treatment
Active Comparator: Pioglitazone
pioglitazone 15 mg for 6 weeks followed by 30 mg for 6 weeks
Drug: Pioglitazone
15 mg per day for 6 weeks and 30 mg per day for further 6 weeks
Other Name: Actos

Placebo Comparator: sugar pill
Placebo comparator
Drug: sugar pill
One capsule daily for 6 weeks followed by two capsules per day for next 6 weeks
Other Name: Lactose

Primary Outcome Measures :
  1. Sympathetic nervous system activity, measured as muscle sympathetic nervous activity and whole-body noradrenaline spillover [ Time Frame: 12 weeks treatment ]

Secondary Outcome Measures :
  1. Baroreflex function, adrenoceptor expression [ Time Frame: 12 weeks treatment ]

Information from the National Library of Medicine

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Ages Eligible for Study:   45 Years to 65 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Males and females aged 45-65 years,
  • non-smokers,
  • HOMA index > 2.5 and
  • who meet ATP III criteria for the metabolic syndrome

Exclusion Criteria:

  • History of diabetes,
  • previous MI, stroke, heart failure, impaired hepatic or renal function.
  • Inability to cease medications which may affect study parameters.

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): NCT00408850

Contact: Nora E Straznicky, PhD, MPH 61 3 8532 1371

Australia, Victoria
Baker Heart Research Institute Recruiting
Melbourne, Victoria, Australia, 8008
Principal Investigator: Nora E Straznicky, PhD MPH         
Sponsors and Collaborators
Baker Heart Research Institute
National Heart Foundation, Australia
Principal Investigator: Nora E Straznicky, PhD, MPH Baker Heart Research Institute

Publications automatically indexed to this study by Identifier (NCT Number):

Responsible Party: Nora E. Straznicky, Dr, Baker Heart Research Institute Identifier: NCT00408850     History of Changes
Other Study ID Numbers: G 06M 2610
First Posted: December 7, 2006    Key Record Dates
Last Update Posted: January 17, 2013
Last Verified: January 2013

Keywords provided by Nora E. Straznicky, Baker Heart Research Institute:
sympathetic nervous system, pioglitazone, metabolic syndrome

Additional relevant MeSH terms:
Metabolic Syndrome X
Pathologic Processes
Insulin Resistance
Glucose Metabolism Disorders
Metabolic Diseases
Hypoglycemic Agents
Physiological Effects of Drugs