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A Strategy to Identify de Novo Mutations in Common Disorders such as Autism and Schizophrenia
Published on: June 15, 2011
Neural and vascular cellular adhesion molecules are associated with cognitive function in patients with
Kristian Varden Gjerde1, Christoffer Bartz-Johannessen2, Else-Marie Løberg3
1NKS Olaviken Gerontopsychiatric Hospital, Erdal, Norway; Department of Clinical Medicine, University of Bergen, Bergen, Norway; Division of Psychiatry, Haukeland University Hospital, Bergen, Norway; Mohn Research Center for Psychotic Disorders, Bergen, Norway.
Background:
Schizophrenia patho-etiology may involve endothelial inflammation and blood-brain barrier (BBB) dysregulation with cellular adhesion molecules (CAMs) as important mediators. CAMs are essential for cellular integrity but can show increased levels in inflammation. Cognitive dysfunction precedes and exists independently of psychotic symptoms in schizophrenia patients. CAMs could impact cognition through influence on BBB integrity. To gain insights into disease mechanisms and potential therapeutic targets, we explored the relationship between CAMs protein levels and neurocognitive tests in schizophrenia-spectrum disorders in the BeSt InTro study.
Methods:
Seventy-one in- and out-patients underwent CAMs measurements and neuropsychological testing on a minimum of one time point: baseline, 6, 26, or 52 weeks. Cognitive domains included working memory, processing speed, verbal abilities, executive functions, and overall cognition. CAMs analyzed were neural CAMs: junctional adhesion molecule (JAM-A) and neural cadherin (N-CAD); vascular CAMs: intercellular adhesion molecule (ICAM)-1, vascular adhesion molecule (VCAM)-1, mucosal addressin cell adhesion molecule (MADCAM), and platelet (P)-selectin from fasting blood samples. Linear mixed effects models, adjusted for age, sex, body mass index, smoking, education, and drug naivety, estimated CAMs effect on cognitive outcome measures.
Results:
N-CAD levels correlated positively with overall cognition (p = 0.002), working memory (p = 0.034), and executive functions (p = 0.0011). ICAM-1 levels correlated positively with overall cognition (p = 0.037). Conversely, JAM-A levels correlated negatively with executive functions (p = 0.021).
Conclusion:
Associations between CAMs (N-CAD, ICAM-1, JAM-A) and neurocognitive tests suggest CAMs may impact cognition in schizophrenia. Contrary to our hypothesis, most associations between CAMs levels and cognitive tests were positive. Future research on mechanisms is mandatory.
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