title: Associations between brain-derived neurotrophic factor plasma levels and severity of the illness, recurrence and symptoms in depressed patients.
abstract: BACKGROUND
  There is increasing evidence that the brain-derived neurotrophic factor (BDNF) is involved in the pathophysiology of mood disorders and that its peripheral levels represent a reliable mirror of its concentration in the brain. The aim of the present study was to measure BDNF plasma levels in patients affected by major depression and to explore the possible relationship between the biological parameter and characteristics of the illness.
  
  
  METHODS
  BDNF plasma levels were evaluated in 30 inpatients suffering from major depression, according to DSM-IV criteria, by means of a commonly employed ELISA method. The clinical characteristics were assessed by the Hamilton Rating Scale for Depression (HRSD) and the Clinical Global Impression Scale.
  
  
  RESULTS
  BDNF plasma levels were significantly lower in the patients with the severest illness compared with the others, and the same was true for patients with dissociative symptoms, severe sleep disturbance and recurrent depression. A significant and negative correlation was observed between the biological parameter and the retardation factor score of the HRSD.
  
  
  CONCLUSIONS
  These findings suggest that low BDNF levels are related to both recurrence and severity of depression, as well as to symptoms typical of dysfunctions of the hypothalamic-pituitary-adrenal axis.
authors: Dipartimento di Psichiatria, Neurobiologia, Farmacologia e Biotecnologie, University of Pisa, Via Roma 67, Pisa, Italy.
authors: Liliana
authors: L
authors: Dell'Osso
authors: Alessandro
authors: A
authors: Del Debbio
authors: Antonello
authors: A
authors: Veltri
authors: Carolina
authors: C
authors: Bianchi
authors: Isabella
authors: I
authors: Roncaglia
authors: Marina
authors: M
authors: Carlini
authors: Gabriele
authors: G
authors: Massimetti
authors: Mario
authors: M
authors: Catena Dell'Osso
authors: Chiara
authors: C
authors: Vizzaccaro
authors: Donatella
authors: D
authors: Marazziti
authors: Armando
authors: A
authors: Piccinni
mesh_terms: D000328:Adult; D000368:Aged; D019208:Brain-Derived Neurotrophic Factor / Q000097:blood*; D003865:Major Depressive Disorder / Q000097:blood* / Q000175:diagnosis* / Q000517:prevention & control; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D012008:Recurrence; D012720:Severity of Illness Index; D012893:Sleep Wake Disorders / Q000097:blood
chemical_list: D019208:Brain-Derived Neurotrophic Factor