Novel imaging approach shows both myelin and axonal changes in schizophrenia

Posted: September 23rd, 2013

A recently published study by Dost Ongur, MD, PhD, Co-Director for the Research Concentration Program, Clinical Director of the Psychotic Disorders Division at McLean Hospital, and an Assistant Professor at Harvard Medical School, has found abnormalities in the myelin in the brain's white matter.

The research used two types of brain imaging: magnetic resonance spectroscopy, which measures the levels of particular chemicals in the brain; and magnetization transfer imaging, which detects changes in the level of myelin in the brain's white matter. Using these techniques, Dr. Ongur found evidence of abnormalities in both myelin and axons (nerve cell projections) in patients with schizophrenia, a serious psychiatric disorder. More specifically, they found reduced myelination of white matter pathways in people with schizophrenia, and also abnormal spread of a type of small molecule (called N-acetylaspartate) thought to be mainly contained within nerve cells.

"The notion that the brain in schizophrenia is characterized by abnormalities in connections between distant brain regions is not new, and imaging studies using diffusion tensor imaging have long suggested that the white matter where these connections travel is abnormal in this condition,"  Dr. Dost Ongur said in a journal news release. "However, we have not had the tools to determine whether the abnormalities are in axons, or the myelin sheath around the axons, or both."

Click here to read the full article in U.S. News and World Report.

Click here for the abstract of the article in Biological Psychiatry.

Breakthrough system for producing images of brain, nervous system

Posted: May 20th, 2013

"Brainbow," originally developed by researchers at Harvard University in 2007, is getting an upgrade. This system creates colorful images of brain tissue by activating multiple fluorescent proteins in neurons. Brainbow has the resolution to visualize individual neurons, which has enhanced researchers' ability to chart the circuitry of the brain and nervous system.

In 2013 Brainbow is getting significant technical improvements. The colors will be brighter, more variable, more persistent, and therefore more usable. These enhancements will enable researchers to better target certain parts of the brain and visualize the neuronal connections between different regions of the brain.

Read the full article in the Harvard GazetteSource: Harvard Gazette, Wednesday, May 15, 2013

Free will; Good & Evil; Nature & Nurture

Posted: June 14th, 2012

Pictured: Claire Brickell discusses the topic of free will in the context of psychodynamic psychotherapy.

Over the past two weeks, the Class of 2012 presented their work in the annual Senior Talks Symposium at McLean and MGH. Topics during week one covered a wide range and included a discussion of evil and psychopathy, group psychotherapy for patients with psychotic disorders, the neural correlates of emotional experiences in depression, and the epigenetics of schizophrenia. Week two featured a discussion of combined neuromodulation and neuroimaging, the psychodynamics of psychopharmacology, and the rise of "Bath Salts" as a new illicit drug. The full schedule is listed below.


Wednesday, June 6, 2012 McLean, de Marneffe, Room 132

  • 1:00 – Jeff DeVido, M.D. – The Question of Evil
  • 1:30 – Karen Adler, M.D. – From object to subject: The role of the patient's experience of the therapist's subjectivity as a catalyst for change
  • 2:00 – Ellen House, M.D. – A Safe Arena: Group Psychotherapy and Psychosis
  • 2:30 – Chris Tangren, M.D. – The Couch and the Anchor: The Use of Metaphors in Psychotherapy
  • 3:30 – Brad Ruzicka, M.D. Ph.D. – Nature, Nurture, and Chromatin Structure
  • 4:00 – Claire Brickell, M.D. – Psychotherapy and Free Will
  • 4:30 – Sharmin Ghaznavi, M.D., Ph.D. – Neural Evidence for the Struggle To Feel Good in Major Depression

Wednesday, June 13, 2012 MGH, Haber Auditorium

  • 1:00 – Brian Schulman, M.D. – The Psychodynamics of Psychopharmacology
  • 1:30 – Amelia Dubovsky, M.D. – A Brief History of Graduate Medical Education: the Birth of Duty Hours
  • 2:00 – Hannah Brown, M.D. –Bath Salts: The Rise of a New Drug
  • 2:30 – Joan Camprodon, M.D., M.P.H., Ph.D. – Simultaneous combination of TMS and fMRI: a window into mechanisms of neuropsychiatric disease and recovery
  • 3:15 – Argo Caminis, M.D. – At the Couch-side: Teaching for Medical Students and Junior Residents in Inpatient Psychiatry
  • 3:45 – Nicole Christian, M.D. – Traditional Mental Health Care in a Post-Conflict Society
  • 4:15 – Kelly Irwin, M.D. – Is everyone having a baby? Or is it just me?

Controlling sleep spindles with light; K99/R00 awarded

Posted: November 13th, 2011

Michael Halassa, Class of 2013, recently published a first author paper in Nature Neuroscience, describing work he carried out at MIT in the lab of Christopher Moore, now at Brown University.  By selective optical control of thalamic activity, Mike and colleagues demonstrated that sleep spindles can be causally generated with millisecond precision to understand their role in physiology and behavior. The work was carried out while Mike was a PGY1 and PGY2 in the Research Concentration Program.

Mike was also recently awarded a NIH pathway to independence career award (K99/R00) through the National Institute of Neurological Disorders and Stroke, the first time such an award has been obtained by a current MGH/McLean resident.