Mechanisms of Insulin Facilitation of Memory

October 30, 2014 updated by: Andreana P. Haley, University of Texas at Austin
The study described in the present application will test the hypothesis that insulin mediated facilitation of memory in Alzheimer's disease (AD) is achieved through enhanced glutamatergic neurotransmission due to improvements in cerebral glucose metabolism. The effect of a single dose of intranasal insulin on memory and cerebral glutamate concentrations in adults with mild AD or amnestic mild cognitive impairment (aMCI), the presumed prodromal phase of AD will be studied. Successful completion of this study may set the stage for a larger-scale treatment trial of intranasal insulin for adults with memory disorders. However, the use of insulin in this manner at this point in time is purely experimental.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The specific aims of this project will be accomplished through a cross sectional repeated measures design in which 15 participants with mild AD or amnestic MCI will undergo assessments of brain structure and function 15 minutes after a single dose of insulin (20 IU) or placebo. Insulin and placebo conditions will be counterbalanced across participants.

Intranasal insulin or placebo administration: Saline and insulin (NovoLog) will be ordered though the UT Student Health Services Pharmacy (Sharon Roberson, Chief Pharmacist) and stored at 4°C, according to standard pharmacy protocols. Three ml doses of saline or insulin will be packaged in nasal spray bottles (e.g., Spectrum Pharmacy Products bottles 969-17404P and actuators 551-24362P) designed to deliver 100μL dose with each spray. A total volume of 200μL will be delivered during each administration (one 100μL dose in each nostril).

Study Type

Interventional

Enrollment (Actual)

12

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Texas
      • Austin, Texas, United States, 78712
        • University of Texas at Austin

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

19 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Clinical diagnosis of probable AD
  • Age over 21
  • Clinical Dementia Rating of 0.5 or 1.0
  • Mini Mental State Exam Score>15

Exclusion Criteria:

  • preexisting diabetes
  • significant neurological disease that might affect cognition, other than AD, including stroke, Parkinson's disease, multiple sclerosis
  • severe head injury with loss of consciousness > 30 minutes or with permanent neurological sequelae
  • significant medical illness or organ failure, such as uncontrolled hypertension or cardiovascular disease, chronic obstructive pulmonary disease, liver disease, or kidney disease
  • current use of anti-psychotic or anti-convulsant medications
  • current or previous use of hypoglycemic agents or insulin
  • MRI contraindications
  • claustrophobia
  • pregnancy

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Basic Science
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: insulin
20 IU of insulin was administered once daily on two occasions in either the first intervention period or second intervention period using a nasal spray bottle
Drug: Insulin
20 IU of insulin was administered once daily on two occasions in either the first intervention period or second intervention period using a nasal spray bottle
Other Names:
  • NovoLog, 20 IU
Placebo Comparator: Saline
200 micro liters of saline was administered once daily on two separate occasions in either the first intervention period or second intervention period using a nasal spray bottle
Other: Saline
200 micro liters of saline was administered once daily on two separate occasions in either the first intervention period or second intervention period using a nasal spray bottle
Other Names:
  • Saline, 200 micro liters

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Cerebral Glutamate Concentration
Time Frame: 15 minutes post insulin or placebo administration
Glutamate concentration was expressed as the ratio of glutamate to creatine. This was determined using magnetic resonance spectroscopy (MRS), a magnetic resonance technique that uses the same equipment as magnetic resonance imaging (MRI), but allows researchers to extract information about the concentrations of various neurochemicals of neurobiological significance.
15 minutes post insulin or placebo administration

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Memory
Time Frame: 15 minutes post insulin or placebo administration
Memory performance was assessed using delayed recall (number of units recalled) on the Wechsler Memory Scale (WMS-IV) logical memory (story recall) test. Scores represent a sum of recalled units of two different stories after a 30 minute delay. Total scores range from 0 to 50 (0-25 for each story) with higher scores reflecting better memory performance
15 minutes post insulin or placebo administration

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of Texas at Austin

Investigators

  • Principal Investigator: Andreana P Haley, PhD, University of Texas at Austin

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

July 1, 2010

Primary Completion (Actual)

April 1, 2014

Study Completion (Actual)

April 1, 2014

Study Registration Dates

First Submitted

June 15, 2010

First Submitted That Met QC Criteria

June 15, 2010

First Posted (Estimate)

June 16, 2010

Study Record Updates

Last Update Posted (Estimate)

November 2, 2014

Last Update Submitted That Met QC Criteria

October 30, 2014

Last Verified

October 1, 2014

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2010-05-0007

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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