Effect of mCPP on Cognitive Control, Appetite, and Neural Responses
Atslēgvārdi
Abstrakts
Apraksts
The prevalence of overweight and obesity has increased rapidly in less than half a century. It is assumed that this development is due to interplay between behavioural, environmental and genetic factors. This increase in weight is associated with multiple-medical conditions, e.g. increased depression, and chronicle health conditions, like heart disease, cancer, and type 2 diabetes, and is associated with high health care costs. The UK has one of the highest rates of obesity in Europe, with 20% of the population defined as obese and over 50% defined as overweight. However treatment options for weight loss, and especially long-term weight maintenance are still limited. The development of safe and effective therapeutics is therefore imperative. An effective way to help weight loss, as part of a comprehensive program, is to prescribe drug treatments designed to reduce food consumption. However, at present, drug treatments for obesity are very limited.
mCPP appears to reduce food intake, and appetite in lean people. However it also seems to effect cognitive processes. Basic research to understand the interplay between these processes in relation to drug effects on appetite are of great interest because it can provide important insight into new development novel treatments for obesity. The investigators propose to test a model outlining that metabolic signals may reduce food intake by interfering with cognitive processes that underpin appetite.
It has been agreed upon that eating behaviour is affected by metabolic signals, e.g. serotonin, insulin and ghrelin, and influenced by food reward processes (Berthoud 2011). But the idea that these mechanisms are modulated via higher cognitive processes such as inhibitory control, attention, and memory is a relatively new domain to be explored. In humans, eating behaviour seems to be a more complex system; which also involves habits, long-term goals, and social interaction. Cognitive processes appear to play an important role in food consumption. Previous studies reported the anorectic effect of the drugs meta-chloriphenylpiperazine (mCPP), a 5-HT2C receptor agonist. Additionally mCPP has been shown to reduce appetite, increase satiety, and enhance memory for emotional material (word recall) and recognition memory (Thomas et al 2015). Preliminary results suggest that mCPP decreased intake of palatable snacks (hedonic eating) and when viewing food pictures appetite and reward related neural responses appear to be modulated by mCPP administration (Thomas et al in preparation). However the interaction between the drugs, neural responses and behaviour are still not known, and the effects of overweight on these responses is a very interesting question in relation to anti-obesity drug development.
In the proposed study the researchers want to investigate the effect of oral administrating mCPP, on neural responses and networks in relation to food reward, cognitive control and working memory and its impact on subsequent snack consumption, food and emotion related memory, and mood and appetite ratings, and additionally the interplay between all these processes in both lean and obese individuals. Participants will get an mCPP dose (30mg) and a placebo on different occasion, where after the neural activation (with fMRI) in response to food stimuli is assesed, inhibition tasks, and memory tests. This will be related to eating behaviour, memory performance, and mood and appetite ratings.
Datumi
| Pēdējoreiz pārbaudīts: | 03/31/2019 |
| Pirmais iesniegtais: | 05/21/2019 |
| Paredzētā reģistrācija iesniegta: | 05/21/2019 |
| Pirmais izlikts: | 05/23/2019 |
| Pēdējais atjauninājums iesniegts: | 05/23/2019 |
| Pēdējā atjaunināšana ievietota: | 05/28/2019 |
| Faktiskais studiju sākuma datums: | 01/31/2019 |
| Paredzamais primārās pabeigšanas datums: | 12/30/2019 |
| Paredzamais pētījuma pabeigšanas datums: | 12/30/2019 |
Stāvoklis vai slimība
Iejaukšanās / ārstēšana
Drug: mCPP condition
Drug: Placebo condition
Fāze
Roku grupas
| Roka | Iejaukšanās / ārstēšana |
|---|---|
| Placebo Comparator: Placebo condition Participants receive placebo capsule | Drug: Placebo condition Healthy participants administrate one capsule of placebo (containing lactose) |
| Active Comparator: mCPP condition Participants receive active (mCPP) capsule | Drug: mCPP condition Healthy participants administrate one capsule of mCPP (30mg) |
Atbilstības kritēriji
| Vecums, kas piemērots studijām | 18 Years Uz 18 Years |
| Dzimumi, kas ir piemēroti studijām | All |
| Pieņem veselīgus brīvprātīgos | Jā |
| Kritēriji | Inclusion Criteria: - Healthy female subjects - Age 18-65 years at start of the study - Body Mass Index (BMI) between 18 and 25 kg/m2 for the lean group and between 30 and 40 kg/m2 for the obese group - Right-handedness (including left-handers could bias the results because of the laterality of brain functions) - Ability to give informed consent - Fluent English speaking - Willingness to be informed about chance findings of pathology Exclusion Criteria: - Subjects who have a non-removable metal object in or at their body, such as, for example: Heart pace-maker, artificial heart valve, metal prosthesis, implants or splinters, non-removable dental braces - Tattoos, that are older than 15 years - Claustrophobia - Limited temperature perception and/or increased sensitivity to warming of the body - Pathological hearing ability or an increased sensitivity to loud noises - Lack of ability to give informed consent - Operation less than three months ago - Simultaneous participation in other studies that involve drugs intake or blood spending - Acute illness or infection during the last 4 weeks - Cardiovascular disorders (e.g., hypertrophic cardiomyopathy, long QT syndrome) - Moderate or severe head injury - Eating disorders - No metabolic (e.g. metabolic disorder, diabetes, insulin resistance), psychological (e.g. depression) or neurological (e.g. epilepsy, headache disorder, multiple sclerosis, traumatic brain injuries) diseases or medication in relation to these diseases. - Intake of any medication that can interfere with the drug or measurements. - Current weight loss regimens, or more then 5kg weight loss in the last 3 months - Smoking - Current pregnancy or breastfeeding - Current or past history of drug or alcohol dependency - alcohol consumption exceeding 12 units a week - Food allergies (e.g. peanut allergy lactose and gluten intolerance) or vegetarian/vegan diet - Disliking the study lunch |
Rezultāts
Primārie rezultāti
1. fMRI brain response during food reward processes [21 min]
Sekundārie iznākuma mērījumi
1. fMRI brain response during inhibition processes [20 min]
2. Emotional categorisation [10 min]
3. Emotional recall part 1 [4 min]
4. Emotional recall part 1 [10 min]
5. Pasta intake [20 min]
6. Cookies intake [10 min]
7. fMRI neural network [10 min]
8. VPA [20 min]
9. N-back [10 min]
