Effect of Physiologic Insulin Administration on Cognition

Summary

In humans, insulin is secreted in pulses from the pancreatic beta-cells, and these oscillations help to maintain fasting plasma glucose levels within a narrow normal range. These pulses become disrupted in the presence of insulin resistance. Some people have referred to Alzheimer's Disease as type 3 diabetes because the glucose uptake in the brain is reduced by 30%. Clinical observations in clinics that treat patients with insulin pulses every 5 minutes for 3 hours twice a week for 2 weeks followed by once a week for 6 weeks and followed by less frequency treatments suggest an improvement in type 2 diabetes control, reduction in insulin resistance and an improvement in diabetes complications. A patient with Parkinson's Disease was treated with this pulsed insulin paradigm and experienced dramatic improvement that has now been maintained over years. Parkinson's Disease has been reported to have a decreased glucose uptake in the brain, so pulsed insulin treatment was tried in a small number of patients with Alzheimer's Disease and there was an impression that they showed improvement. Clinics that use pulsed insulin treatment change more than one parameter of the insulin pulses which makes it difficult to determine what is giving the improvement. The euglycemic hyper-insulinemic clamp, also called a clamp, is a well-standardized test that measures insulin resistance and involves intravenous insulin infusion. This single patient study will enroll one patient with early Alzheimer's disease and insulin resistance. The subject will have one standard clamp test with continuous insulin followed by 4 clamps over a 2-week period using the same amount of insulin over the same period of time but administered in pulses every 5 minutes. This was the number of pulsed insulin treatments needed to see a dramatic improvement in Parkinson's disease. The cognition in the Alzheimer's disease patient will be thoroughly evaluated with questionnaires and walking on a special mat while doing arithmetic tasks before and after the 4 pulsed insulin clamps. If this study demonstrates an improvement in cognition, one will know that the only thing that changed from the standard clamp was the pulse nature of the insulin delivery.

Conditions

• Alzheimer Disease

Interventions

OTHER

Blood draws

After passing the screening, participation in the research study will be approximately three weeks. The participant will have seven study visits all at the Pennington Center. On five occasions, the participant will have a five-hour visit in the inpatient unit. At the study visit blood will be drawn. The total amount of blood drawn during the study is approximately 12 fluid ounces.

OTHER

Hyperinsulinemic Euglycemic Clamp Technique Insulin Sensitivity test

This procedure measures how the body responds to insulin. Insulin is normally produced by the body during meals and helps the body use sugar. There will be two IV lines, one in the participant's arm and one in the participant's hand on the opposite side. Small amounts of glucose and insulin will be infused into the participant's arm. The participant's blood sugar level will be checked every 5-10 minutes from the IV in the hand to determine how much glucose the participant should have to keep blood sugar at a normal level. The participant's hand will be placed inside a warming box to increase skin temperature to about 105 degrees Fahrenheit. The temperature will be warm, but not uncomfortable. During the IV procedure, a small amount of the participant's own blood (less than 1 teaspoon) will immediately be returned into the vein through the IV after each specimen is collected.

OTHER

Resting Metabolic Rate (RMR)

After the participant rests for 30 minutes, a clear plastic hood will be placed over the participant's head and chest area. The hood is ventilated with fresh air. The participant's oxygen intake and carbon dioxide output will be measured for 30 minutes to determine how many calories the participant burns during the time they are being tested.

Sponsors & Collaborators

• Pennington Biomedical Research Center

  lead OTHER

Study Design

Allocation

NA

Purpose

TREATMENT

Masking

NONE

Model

SINGLE_GROUP

Eligibility

Min Age

65 Years

Max Age

75 Years

Sex

MALE

Healthy Volunteers

No

Timeline & Regulatory

Start

2024-05-16

Primary Completion

2025-03-01

Completion

2025-03-01

Countries

• United States

Study Locations