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Corpus callosum signal intensity in patients with bipolar and unipolar disorder

¹ Department of Psychiatry, Western Psychiatric Institute and Clinic, University of Pittsburgh School of Medicine, Pennsylvania, USA
² Department of Psychiatry, IRCCS S Matteo, University of Pavia School of Medicine, Italy
³ Division of Mood and Anxiety Disorders, Department of Psychiatry, University of Texas Health Science Center, San Antonio, Texas, USA
⁴ Department of Psychiatry, University of Pittsburgh School of Medicine
⁵ Department of Psychiatry, University of Pittsburgh

Correspondence to:
Correspondence to:
Dr Jair C Soares
Department of Psychiatry, Division of Mood and Anxiety Disorders, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA; soares{at}uthscsa.edu

Background: Anatomical abnormalities in the corpus callosum have been reported in magnetic resonance imaging (MRI) studies in patients with bipolar but not unipolar disorder. MRI signal intensity can be used as a putative index of corpus callosum myelination.

Objectives: To measure MRI signal intensity in patients with bipolar and unipolar disorder to investigate abnormalities of corpus callosum myelination.

Methods: The study involved 29 DSM-IV bipolar patients (mean (SD) age, 35 (11) years; 16 male, 13 female), 23 DSM-IV unipolar patients (41 (10) years; 4 male, 19 female), and 36 healthy controls (37 (10) years; 23 male, 13 female). A 1.5T GE Signa magnet was employed, with a fast spin echo sequence. Corpus callosum signal intensity was obtained blindly using the semiautomated software NIH Image 1.62.

Results: Bipolar patients had lower corpus callosum signal intensity for all callosal subregions (genu, anterior and posterior body, isthmus, splenium) than healthy controls (ANCOVA, age and sex as covariates, p<0.05). No significant differences were found between unipolar and healthy subjects (ANCOVA, age and sex as covariates, p>0.05).

Conclusions: The findings suggest abnormalities in corpus callosum white matter in bipolar but not unipolar patients, possibly because of altered myelination. Such abnormalities could lead to impaired interhemispheric communication in bipolar disorder. Longitudinal MRI studies involving first episode and early onset bipolar patients will be necessary for a better understanding of the potential role of abnormalities of corpus callosum myelination in the pathophysiology of bipolar disorder.

Keywords: neuroimaging; nuclear magnetic resonance; magnetic resonance imaging; mood disorders

Abbreviations: DSM-IV, Diagnostic and Statistical Manual of Mental Disorders, fourth edition; SCID, structured clinical interview for DSM-IV

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