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About Nikolaos Venizelos


Nikolaos Venizelos is a professor emeritus and docent in biomedicine with a research focus in experimental neuropsychiatry at the School of Health and Medical Sciences, Örebro University. He has a Medicine Doctor's degree (Ph.D. in medicine) from the Karolinska Institute, where he worked until 2001.

Prof. Venizelos has established the Neuropsychiatric Research Laboratory at the School of Health & Medical Sciences. His research work is focused on the membrane transport of the amino acids tyrosine and tryptophan in schizophrenia and related disorders such as bipolar, autism and ADHD. Tyrosine and tryptophan are the building stones (so-called precursors) for dopamine and serotonin, the brain's most important neurotransmitters, necessary for the central nervous system. The research conducted in Neuropsychiatric Research Laboratory is leading both nationally and internationally.

Prof. Nikolaos Venizelos and his research group have in a number of studies (see publications), demonstrated that membrane transport of tyrosine and tryptophan is strongly involved in the pathophysiology of schizophrenia, bipolar and autism disorders. Recent studies show that even ADHD, probably, have an influence on the regulation of dopamine and serotonin turnover in the brain. The research group has also developed and demonstrated that the so-called fibroblast model, a human cellular in vitro technique, among others, excludes the external influences of medications and other environmental factors that make it suitable for studying amino acid transport in neuropsychiatric disorders.

Furthermore, the research lab disposes of a unique biobank, with primary fibroblast lines from patients with different neuropsychiatric diseases, osteoporosis and matched controls, which are used as model systems for studying, among other things, the transport mechanism of tyrosine and tryptophan in neuropsychiatric disorders.

Research focus, interaction

Prof. Venizelos ' current research focuses on identifying the pro-inflammatory cytokines and their role in the membrane transport of tyrosine and tryptophan in neuropsychiatric disorders, In co-operation with NGBI-Research Centre, to identify the influence of probiotics and butyrate, on the functionality of tryptophan transport, which is a precursor to the neurotransmitter serotonin. Recently has started a long-lasting collaborative research project between Örebro University and Ikaria/Greece, to explore factors related to healthy ageing

External main collaborations

Nationally, the Venizelos group is collaborating with the Dept. of Endocrinology, Karolinska University Hospital, where the tryptophan transporter's role in men with Idiopathic Osteoporosis is examined.

Internationally he conducts research in collaboration with a research team in New York (United States), for the reprogramming of fibroblasts from autism, to so-called Pluripotent Stem Cells, and onto nerve cells. Collaborative research is carried out even with a research group at the National Hellenic Research Foundation in Athens, in order to identify possible common (+/-) regulatory genes involved in amino acid transport at neuropsychiatric disorders, through systems biology.

The main goal of the research is to identify pathophysiological and genetic abnormalities at the cellular level that can be linked to the behavioural patterns of patients. In the longer term, this could open opportunities for better understanding and more customized treatment of schizophrenia and related neuropsychiatric disorders.


Currently, and on behalf, Prof. Venizelos coordinating a postgraduate course of Multidisciplinary Seminars for 2.5 credits, is supervising PhDs, Bachelor and Master’s thesis and PBL groups of medical students in the 3rd year of studies.

Methods employed

  • Cell culture and Biobank facilities of primary fibroblast cultures from human skin biopsies.
  • Amino acid transport in adherent fibroblast cells using the "cluster-tray" technique.

Biobank facilities

Tissue: Primary fibroblast lines from patients with schizophrenia, bipolar disorder, autism, ADHD and Idiopathic Osteoporosis and matched controls



Articles in journals |  Articles, reviews/surveys |  Books |  Chapters in books |  Conference papers |  Manuscripts | 

Articles in journals

Articles, reviews/surveys


Chapters in books

Conference papers