Serum Levels of Brain-Derived Neurotrophic Factor, Nerve Growth Factor, Neurotrophin-3, and Glial-Derived Neurotrophic Factor in Children with Specific Learning Disorder.

Introduction: Specific learning disorder (SLD) is a neurodevelopmental disorder that involves complex interactions of genetic, neurobiological and environmental factors, but the definite mechanisms remain mostly unknown. The possible role of neurotrophins has been implicated in the pathophysiology of various neurodevelopmental disorders. This study aimed to investigate whether serum levels of brain-derived neurotrophic factor (BDNF), glial-derived neurotrophic factor (GDNF), nerve growth factor (NGF), and neurotrophin-3 (NT-3) in children with SLD deviate from those of neurotypical brains. Methods: Forty-four patients with SLD and 44 healthy controls aged 7--12 years were included. SLD diagnosis and severity was determined using DSM-5-based interviews and SLD clinical observation battery. Serum neurotrophins were measured using enzyme-linked immunosorbent assay. Results: BDNF (p=0.032), NGF (p=0.029), and NT-3 (p=0.025) serum levels were significantly higher in the SLD group compared to the control group; however, serum levels of GDNF did not show any significant difference between groups. On the other hand, GDNF serum levels were significantly different between mild and severe SLD groups (p=0.007) and were lower in severe SLD subjects than in mild cases. There was also a significant correlation between patients' reading speeds and serum levels of GDNF (p=0.025), and GDNF serum levels were lower in patients with slower reading speeds. Conclusion: These findings suggest that neurotrophins might play a role in the pathophysiology of SLD. Increased serum levels of BDNF, NGF, and NT-3 might reflect compensatory attempts at neuroprotection against neurodevelopmental impairment.

Exacerbation of obsessive compulsive disorder symptoms in children and adolescents during COVID-19 pandemic.

OBJECTIVE: To investigate the effects of COVID-19 pandemic and related home confinement on symptom profile, symptom severity and exacerbation of obsessive compulsive disorder (OCD) symptoms and related factors among young subjects with OCD. METHOD: Young subjects who have been followed up with a primary diagnosis of OCD in a university hospital were reached by telephone or online programs to assess symptom profile, symptom severity and exacerbation during pandemic. Children's Yale-Brown Obsessive Compulsive (CY-BOCS) and Clinical Global Impression- Severity (CGI-S) Scales were used to rate symptom profile and severity before pandemic and during pandemic periods. RESULTS: There was a significant increase in the frequency of contamination obsessions (p=0.008) and cleaning/washing compulsions (p=0.039) during pandemic period. CY-BOCS obsessions (p<0.001), compulsions subscales (p<0.001) and total scores (p<0.001), and CGI-S scores (p<0.001) during pandemic period were statistically higher than before pandemic period. There was a significant relationship between the change in CY-BOCS scores with talking/searching in the social environment about COVID-19, daily preoccupation about COVID-19, duration of OCD diagnosis and diagnosis of COVID-19 in someone familiar. CONCLUSIONS: Young subjects with OCD may develop additional symptoms and worsen already existing symptoms of OCD during COVID-19 pandemic.