Cognitive Function Abnormal, Type 2 Diabetes Mellitus
Conditions
Keywords
Functional MRI, Cognition, Olfactory function, loxenatide
Brief summary
This is a prospective, randomized, open label, parallel,4-month study to explore and evaluate the therapeutic effects of polyethylene glycol loxenatide on the cognitive function, olfactory function, and odor-induced brain activation in T2DM patients with normal cognitive status or MCI.
Detailed description
This is a prospective, randomized, open label, parallel, 4-month study to explore and evaluate the therapeutic effects of polyethylene glycol loxenatide on the cognitive function, olfactory function, and odor-induced brain activation in T2DM patients with normal cognitive status or MCI inadequately controlled with metformin monotherapy. The control group was treated with Gliclazide. There are 1 principal investigator, 6 sub-investigators and 1 nurse in research centre. The sub-investigators will screen in the outpatient and inpatient departments to enroll 58 patients (29 patients for each arm) totally with the inclusion and exclusion criteria in 9 months. The patients will be randomized at a 1:1 ratio into loxenatide and Gliclazide treatment group with a computer-generated random order. All patients will also continue on their existing dose and regimen of metformin throughout the study. At the baseline, clinical information collection, 100g-steamed bread meal test, biochemical measurement, body composition analysis, cognitive assessment, olfactory test and functional magnetic resonance imaging(fMRI) scan will be conducted for all patients. During the treatment period, visits at 4-week intervals will be performed to evaluate the safety of drugs and adjust the dose of metformin if hypoglycaemia occurs; meanwhile, fasting and 2-hour postprandial plasma glucose assayed by fingerstick, physical examination, and olfactory test will be conducted. At the end of the study, all of the assessments will be performed again for all recruited subjects, including early withdrawal patients.
Interventions
DRUGloxenatide Group
Loxenatide will be initiated and maintained at 0.2mg once weekly until the completion of the study. All patients will also continue on their existing dose and regimen of metformin throughout the study.
DRUGGliclazide Group
Gliclazide will be initiated and maintained at 30mg/day every morning. If necessary, the dose can be increased to 120mg once daily. All patients will also continue on their existing dose and regimen of metformin throughout the study.
Sponsors
The Affiliated Nanjing Drum Tower Hospital of Nanjing University Medical School
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
40 Years to 75 Years
Healthy volunteers
No
Inclusion criteria
* patients with type 2 diabetes mellitus ; * Aged:40 -75 years ; * Cognitive function assessment suggests normal status or mild cognitive impairment; * a stable dose of metformin monotherapy (≥1,500 mg daily) for at least 90 days, * HbA1c 7 - 10%; * ≥6 years of education; * Right-handed.
Exclusion criteria
* patients unable to complete brain MRI scanning; * nasal disease that affected olfactory function; * hepatic dysfunction with liver transaminases \> 2.5 times upper normal limits and renal impairment with an estimated glomerular filtration rate \< 60ml/min/1.73m2 ; * acute cardio/cerebrovascular disease, psychiatric disorders, pancreatitis, acute infection, malignant tumor,thyroid disease and homorne drug use; * a history of related drug allergy; * alcohol or drug misuse; * pregnant, breast-feeding or intending to become pregnant.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change of olfactory brain activation by fMRI | from baseline to 4-month follow-up | Whether the activation degree of olfactory task fMRI brain area in the two groups after intervention was different from that before treatment and the difference of changes between the two groups. All patients underwent odor-induced task fMRI on a 3.0T MR scanner with 222 volumes for task fMRI and 230 volumes for resting-state fMRI. The odor-induced task consisted of fresh air rest and scent. Odor-induced brain activation was assessed by a general linear model using Statistical Parametric Mapping 12 (SPM12) software. Following extraction of the three separate conditions fresh air, scent, and rest from the whole sequence, contrasts were made for each participant between fresh air \> rest and scent \> rest. Odor-induced fMRI data were analyzed in the mask of the olfactory network, including the regions of bilateral parahippocampus, amygdala, piriform cortex, insula, orbitofrontal cortex, hippocampus, and entorhinal cortices. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Change of cognitive function | from baseline to 4-month follow-up | Cognitive function were improved, which means MoCA scores were improved after treatment, the RBANS total score increased by 0.5 standard deviation compared with baseline after treatment. |
| Change of metabolism | from baseline to 4-month follow-up | The changes of glycosylated hemoglobin among the two groups before and after intervention. The level of glycosylated hemoglobin \<7% means better glucose metabolism. |
Countries
China
Contacts
Primary ContactYan Bi, MD, PhD
Outcome results
None listed