(Press-News.org) Philadelphia, PA - 11 May 2011 - Two new research studies published in Biological Psychiatry point to progressive abnormalities in brain development that emerge as vulnerable individuals develop schizophrenia.
The first of these papers studied individuals with a deletion of a small section of chromosome 22. This genetic deletion often results in the development of abnormalities in the structure of the heart and of the face, a condition called velocardiofacial syndrome (VCFS; also known as 22q11.2 deletion syndrome). Up to 32% of people with VCFS develop psychotic disorders including schizophrenia, which occurs in 1% of the general population.
Using magnetic resonance imaging (MRI), Dr. Wendy Kates and her colleagues showed that during adolescence, progressive deficits in the volume of the temporal cortex gray matter were predictive of developing psychosis.
"Our findings suggest that in VCFS, brain changes during mid-adolescence, particularly in the temporal lobe, predict early signs of psychosis," said Dr. Kates. "This suggests that it may be possible, eventually, to develop a screening tool that would identify those VCFS-affected youth who are at the highest risk for schizophrenia."
In another paper, Dr. Andrew McIntosh and colleagues report a similar pattern among adolescents and young adults who were followed over a 10 year period. All of the young people were well at the beginning of the study, but some were at high genetic risk of developing schizophrenia due to having family members with schizophrenia.
"The participants were examined repeatedly by a psychiatrist and with structural brain scans to see if there were changes in brain structure in people who later became unwell," explained Dr. McIntosh. "At the end of the study, we found that there were accelerated reductions in the volume of particular brain structures in the people at high risk, and additional reductions in the volume of the frontal lobes in those people who later developed schizophrenia."
These two studies highlight the existence of progressive changes in brain structure related to the emergence of symptoms among individuals at risk for developing schizophrenia.
"These studies cannot define the specific changes at the cellular level and thus, we are limited in our capacity to make precise predictions based on these MRI data," commented Dr. John Krystal, Editor of Biological Psychiatry. "However, the findings suggest that schizophrenia is not simply a 'scar' but rather an ongoing brain process that might need to reach an as yet unclear stage where symptoms emerge. That being the case, there is hope that someday one might develop treatments that block this 'disease process' as we have been able to do for some other heritable brain diseases."
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Notes to Editors
The first article mentioned is "Neuroanatomic Predictors to Prodromal Psychosis in Velocardiofacial Syndrome (22q11.2 Deletion Syndrome): A Longitudinal Study" by Wendy R. Kates, Kevin M. Antshel, Stephen V. Faraone, Wanda P. Fremont, Anne Marie Higgins, Robert J. Shprintzen, Jo-Anna Botti, Lauren Kelchner, and Christopher McCarthy. The authors are affiliated with State University of New York at Upstate Medical University, Syracuse, New York.
The second discussed article is "Longitudinal Volume Reductions in People at High Genetic Risk of Schizophrenia as They Develop Psychosis" by Andrew M. McIntosh, David C. Owens, William J. Moorhead, Heather C. Whalley, Andrew C. Stanfield, Jeremy Hall, Eve C. Johnstone, and Stephen M. Lawrie. The authors are affiliated with University of Edinburgh, Royal Edinburgh Hospital, Edinburgh, United Kingdom.
The articles appear in Biological Psychiatry, Volume 69, Number 10 (May 15, 2011), published by Elsevier.
The authors' disclosures of financial and conflicts of interests are available in their respective articles.
John H. Krystal, M.D. is Chairman of the Department of Psychiatry at the Yale University School of Medicine and a research psychiatrist at the VA Connecticut Healthcare System. His disclosures of financial and conflicts of interests are available at http://journals.elsevierhealth.com/webfiles/images/journals/BPS/Biological_Psychiatry_Editorial_Disclosures_03_29_11.pdf.
The articles mentioned above are available upon request. Contact Chris J. Pfister at c.pfister@elsevier.com to obtain copies or to schedule an interview.
About Biological Psychiatry
This international rapid-publication journal is the official journal of the Society of Biological Psychiatry. It covers a broad range of topics in psychiatric neuroscience and therapeutics. Both basic and clinical contributions are encouraged from all disciplines and research areas relevant to the pathophysiology and treatment of major neuropsychiatric disorders. Full-length reports of novel results, commentaries, case studies of unusual significance, and correspondence judged to be of high impact to the field are published, particularly those addressing genetic and environmental risk factors, neural circuitry and neurochemistry, and important new therapeutic approaches. Concise reviews and editorials that focus on topics of current research and interest are also published rapidly.
Biological Psychiatry (www.sobp.org/journal) is ranked 4th out of 117 Psychiatry titles and 13th out of 230 Neurosciences titles in the 2009 ISI Journal Citations Reports® published by Thomson Reuters. The 2009 Impact Factor score for Biological Psychiatry has increased to 8.926.
About Elsevier
Elsevier is a world-leading publisher of scientific, technical and medical information products and services. The company works in partnership with the global science and health communities to publish more than 2,000 journals, including The Lancet and Cell, and close to 20,000 book titles, including major reference works from Mosby and Saunders. Elsevier's online solutions include SciVerse ScienceDirect, SciVerse Scopus, Reaxys, MD Consult and Nursing Consult, which enhance the productivity of science and health professionals, and the SciVal suite and MEDai's Pinpoint Review, which help research and health care institutions deliver better outcomes more cost-effectively.
A global business headquartered in Amsterdam, Elsevier employs 7,000 people worldwide. The company is part of Reed Elsevier Group PLC, a world-leading publisher and information provider, which is jointly owned by Reed Elsevier PLC and Reed Elsevier NV. The ticker symbols are REN (Euronext Amsterdam), REL (London Stock Exchange), RUK and ENL (New York Stock Exchange).
Brain development goes off track as vulnerable individuals develop schizophrenia
2011-05-11
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