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Schahram Akbarian, MD, PhD; William E. Bunney, Jr, MD; Steven G. Potkin, MD; Sharon B. Wigal, PhD; Jennifer O. Hagman, MD; Curt A. Sandman, PhD; Edward G. Jones, MD, PhD

Arch Gen Psychiatry. 1993;50(3):169-177.

Abstract
• Epidemiological and anatomical studies support the theory that disturbances of brain development may play a contributory role in the etiology of schizophrenia. Anatomical findings suggest that the normal pattern of neuronal migration during development of the cerebral cortex may be affected in the brains of schizophrenics, with the implication that cortical connectivity and associative function will be disrupted. In the present investigation in matched schizophrenic and control brains, we examined a particular population of neurons found in the prefrontal cortex and underlying white matter and characterized by histochemical staining for the enzyme nicotinamide-adenine dinucleotide phosphate—diaphorase. In normal brains, these neurons are found in highest numbers in the white matter immediately deep to layer VI of the cortex where they remain from the subplate, an early formed, but transitory structure that plays a key role in cortical development and connection formation. The dorsolateral prefrontal area of schizophrenics showed a significant decline in nicotinamide-adenine dinucleotide phosphate—diaphorase neurons in the superficial white matter and in the overlying cortex but a significant increase in these neurons in white matter deeper than 3 mm from the cortex. These findings are consistent with a disturbance of the subplate during development in which the normal pattern of programmed cell death is compromised and accompanied by a defect in the normal orderly migration of neurons toward the cortical plate. These are likely to have serious consequences for the establishment of a normal pattern of cortical connections leading to a potential breakdown of frontal lobe function in schizophrenics.

Author Affiliations
From the Department of Anatomy and Neurobiology (Drs Akbarian and Jones) and the Department of Psychiatry and Human Behavior (Drs Bunney, Potkin, Wigal, Hagman, and Sandman), University of California, Irvine.

Footnotes
Accepted for publication November 11, 1992.

Reprint requests to the Department of Anatomy and Neurobiology, University of California, Irvine, CA 92717 (Dr Jones).

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