TY - JOUR
T1 - NMDA-receptor coagonists in serum, plasma, and cerebrospinal fluid of schizophrenia patients
T2 - A meta-analysis of case-control studies
AU - Brouwer, Annelies
AU - Luykx, Jurjen J.
AU - van Boxmeer, Loes
AU - Bakker, Steven C.
AU - Kahn, René S.
PY - 2013/9
Y1 - 2013/9
N2 - Serine and other amino acids that function as coagonists at the N-methyl-. d-aspartate receptor (NMDAR) have been extensively investigated in schizophrenia (SCZ). However, studies comparing amino acid levels in body fluids of SCZ patients with healthy controls have yielded inconsistent results. We therefore conducted a meta-analysis (search: May 9, 2013) of serine, l-serine, d-serine, glycine, alanine, proline, and aspartate levels in blood and cerebrospinal fluid (CSF) obtained from adult SCZ patients and healthy controls. Standardized differences of means (SDMs) were computed, and heterogeneity, subgroup, sensitivity, and publication bias analyses were conducted. Blood serine levels were found to be significantly higher in SCZ patients compared to healthy controls (SDM = 0.280 (0.021-0.540), p=0.034; N=1671 subjects), whereas CSF serine, l-serine, d-serine, glycine, alanine, proline, and aspartate levels did not differ. Stratification by sex suggested that the case-control difference in blood serine levels particularly applies to male subjects. These results provide support for blood serine level aberrations in SCZ patients and warrant further research to disentangle the involvement of serine with SCZ in both sexes.
AB - Serine and other amino acids that function as coagonists at the N-methyl-. d-aspartate receptor (NMDAR) have been extensively investigated in schizophrenia (SCZ). However, studies comparing amino acid levels in body fluids of SCZ patients with healthy controls have yielded inconsistent results. We therefore conducted a meta-analysis (search: May 9, 2013) of serine, l-serine, d-serine, glycine, alanine, proline, and aspartate levels in blood and cerebrospinal fluid (CSF) obtained from adult SCZ patients and healthy controls. Standardized differences of means (SDMs) were computed, and heterogeneity, subgroup, sensitivity, and publication bias analyses were conducted. Blood serine levels were found to be significantly higher in SCZ patients compared to healthy controls (SDM = 0.280 (0.021-0.540), p=0.034; N=1671 subjects), whereas CSF serine, l-serine, d-serine, glycine, alanine, proline, and aspartate levels did not differ. Stratification by sex suggested that the case-control difference in blood serine levels particularly applies to male subjects. These results provide support for blood serine level aberrations in SCZ patients and warrant further research to disentangle the involvement of serine with SCZ in both sexes.
KW - Blood
KW - Cerebrospinal fluid
KW - Meta-analysis
KW - NMDA receptor coagonist
KW - Schizophrenia
KW - Serine
UR - http://www.scopus.com/inward/record.url?scp=84880158883&partnerID=8YFLogxK
U2 - 10.1016/j.neubiorev.2013.06.007
DO - 10.1016/j.neubiorev.2013.06.007
M3 - Review article
C2 - 23792047
AN - SCOPUS:84880158883
SN - 0149-7634
VL - 37
SP - 1587
EP - 1596
JO - Neuroscience and Biobehavioral Reviews
JF - Neuroscience and Biobehavioral Reviews
IS - 8
ER -