Abnormalities of SNARE mechanism proteins in anterior frontal cortex in severe mental illness.
A fundamental molecular component of neural connectivity is the SNARE (SNAP receptor) protein complex, which consists of three proteins, syntaxin, SNAP-25 and VAMP. Under appropriate conditions, the SNARE complex can be formed in vitro. To investigate the hypothesis that dysregulation of SNARE proteins or their interactions could be abnormal in severe mental disorders, the three SNARE proteins and the complex were studied in post-mortem anterior frontal cortex homogenates. An ELISA was used to quantify SNARE protein immunoreactivities in cortical homogenates from four groups: patients with schizophrenia who died of causes other than suicide (n = 6), patients with schizophrenia and suicide (n = 7), patients with depression and suicide (n = 11), and controls (n = 11). Differences between groups in patterns of SNARE protein immuno-reactivities were demonstrated [Wilks' Lambda F(9,68) = 3.57, P = 0.001]. Protein-by-protein analyses indicated a significant reduction in SNAP-25 immunoreactivity in the schizophrenia non-suicide group [28% decrease relative to controls, F(3,31) = 6.45, P = 0.002, Student-Newman-Keuls test, P < 0.01]. The intercorrelations between SNARE protein and synaptophysin immunoreactivities were high in controls, but lower in the other groups, further indicating disturbances in relationships between these proteins. The extent of SNARE complex formation in vitro was studied using immuno-blotting. Significant differences related to group membership were observed for the SNARE complexes identified by SNAP-25 [Wilks' Lambda F(3,31) = 4.76, P = 0.008] and by syntaxin immunostaining [Wilks' Lambda F(3,31) = 9.16, P = 0.0002]. In both groups with suicide as a cause of death, relatively more SNAP-25 and syntaxin was present in the heterotrimeric SNARE complex than in other molecular forms. These abnormalities in the SNARE complex could represent a molecular substrate for abnormalities of neural connectivity in severe mental disorders.
Honer
William G
WG
Department of Psychiatry, University of British Columbia, Vancouver, BC, Canada. honer@interchg.ubc.ca
Falkai
Peter
P
Bayer
Thomas A
TA
Xie
Jane
J
Hu
Lily
L
Li
Hong-Ying
HY
Arango
Victoria
V
Mann
J John
JJ
Dwork
Andrew J
AJ
Trimble
William S
WS
D000328:Adult; D003866:Depressive Disorder / Q000378:metabolism / Q000503:physiopathology; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D008297:Male; D008565:Membrane Proteins / Q000378:metabolism / Q000502:physiology*; D001523:Mental Disorders / Q000503:physiopathology*; D008875:Middle Aged; D009419:Nerve Tissue Proteins / Q000502:physiology*; D017397:Prefrontal Cortex / Q000503:physiopathology*; D050683:R-SNARE Proteins; D050600:SNARE Proteins; D012559:Schizophrenia / Q000378:metabolism / Q000503:physiopathology; D033921:Vesicular Transport Proteins
D008565:Membrane Proteins; D009419:Nerve Tissue Proteins; D050683:R-SNARE Proteins; D050600:SNARE Proteins; D033921:Vesicular Transport Proteins