Nicolaus Copernicus University Poland
Title: Cognition and affective temperament in obesity: the neuropsychological and genetics data
Prof Alina Borkowska is head of Clinical Neuropsychology Department in Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Torun and head of Clinical Psychology Department of Medical University in Lodz, Poland. Her research concerns on neurobiology and genetics of cognitive dysfunctions in psychiatric diseases, especially schizophrenia, bipolar disorder, OCD , MCI, dementia and pathological obesity. She is a head of numerous university and national Polish grants in this area and participates in international programs concerning genetics, neurobiology and treatment of cognitive dysfunctions in psychiatric diseases. Prof Borkowska was awarded with national and international scientific awards. She is a member of Polish Psychiatric Association, European Psychiatrist Association and member of scientific board in numerous scientific journals and Polish Committee of Science. She is invited speaker on international conferences and author of numerous publications in international journals.
Background: Obesity is an serious health problem, especially in countries with high economic development associated with neuropsychiatric disturbances. The results of current studies indicate that psychological factors, affective disorders and cognitive dysfunctions may play an important role in etiopathogenesis and in the course of this disease. We explore the relationships between obesity, depression, five dimensions of affective temperament, cognitive functions and polymorphism of genes connected with emotional and cognitive processes. Subjects: 520 obese patients (BMI>35), aged 18-56 (mean 42,3 + 12) years were included to the study. The results of patients with obesity were compared with the results obtained by 200 healthy controls (BMI<25), sex, age and education matched to the investigated group. Methods: The intensity of depressed symptoms were assessed by Beck Depression Inventory and Hamilton Depression Scale. For evaluation of five dimensions of affective temperament (depressive, cyclothymic, hyperthymic, irritable and anxious) the Polish version of TEMPS-A Akiskal scale were used. Cognitive functions connected with activity of prefrontal cortex were evaluated by Wisconsin Card Sorting Test. The polymorphism of genes connected with serotonine and dopamine system and BDNF gene were evaluated using PCR method. All subjects were also checked by Food Addiction Scale. The results: Obese patients presented higher prevalence of depression (up to 50% of the whole group presents severe intensity of depression), worse performance of cognitive tests (especially WCST and TMT B) and higher score in Food Addiction Scale compared to healthy controls. Patients with obesity presents higher prevalence of depressive, cyclothymic and anxious temperament than healthy subjects. Female higher scores on depressive and anxious, while males on the irritable and hyperthymic temperament. The intensity of depression were correlated with depressive temperament especially in females. The higher scores of Food Addition Scale show positive correlation with hyperthymic and cyclothymic temperament. The higher score of depressive temperament in TEMPS-A scale was associated with the s/s allele of 5-HTT polymorphism gene. The val/val allele of Val/Met polymorphism of BDNF gene was associated with higher score of depressive and anxious temperament, while met/met allele of this gene was connected with higher score of hyperthymic temperament in TEMPS-A scale. The results of all parameters of WCST were connected with the polymorphism of COMT gene. The G/G allele of 5-HTT gene was associated with worse results on two dimensions on WCST (non-perseverative errors and numbers of cards needed to complete 1st category). Conclusions: Obese patients presents higher prevalence of depression, difficulties in prefrontal cognitive functions and different pattern of affective temperament compared to healthy control subjects. The polymorphism of serotonine transporter 5-HTT and BDNF genes were associated with depression and affective temperament, while dopaminergic COMT gene to the cognitive abilities. This may indicate different influence of serotonine, dopamine and neurodevelopmental system genes on emotional and cognitive functions in patients with obesity.