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Abstract
Current theories of the etiology of depression implicate disturbances and imbalances
in the junction of monoaminergic systems, particularly involving serotonin and norepinephrine.
Neural transplantation is a potential approach towards restoring balanced functioning
in the central nervous system. The purpose of the present study was to determine the
utility of transplanting monoamine-producing cells into the brain to alleviate behavioral
depression. Serotonin-containing pineal gland tissue, catecholamine-containing adrenal
medullary tissue, a combination of both, and a control of striated muscle tissue were
implanted into the frontal neocortex of adult rats. The ability of these grafts to
prevent the development of learned helplessness, a widely accepted model for depression,
was assessed 6–8 weeks following transplantation. The monoamine-containing transplants,
but not the control transplants, were able to prevent the development of learned helplessness.
Immunocytochemical and ultrastructural studies revealed that the grafted monoaminergic
tissues survived and continued to produce high levels of monoamines. These results
suggest that neural transplants may provide a long-term local source of monoamines
as a potentially new approach for alleviating some forms of depression.
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Article info
Publication history
Received in revised form:
May 4,
1990
Received:
January 2,
1990
Identification
Copyright
© 1990 Published by Elsevier Inc.