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Am J Physiol Endocrinol Metab 245: E332-E337, 1983;
0193-1849/83 $5.00
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AJP - Endocrinology and Metabolism, Vol 245, Issue 4 332-E337, Copyright © 1983 by American Physiological Society

ARTICLES

Evidence for a longitudinal pathway in rat hypothalamus that controls FFA mobilization

C. C. Coimbra and R. H. Migliorini

In initial exploratory experiments, bilateral, symmetrical, relatively large electrolytic lesions were produced, injuring anterior, middle, and posterior hypothalamus but respecting the midlateral region. Only lesions in the preoptic-anterior hypothalamic region and in the posterior hypothalamus were effective in blocking free fatty acid (FFA) mobilization induced by intravenous 2-deoxyglucose. Lesions in the ventromedial hypothalamus were ineffective. In subsequent experiments, suppression of plasma FFA response to the drug was observed in rats with small, globular (0.5-1.0 mm diam), bilateral lesions either in the preoptic (PO) or in the lateral hypothalamic (LH) areas. Groups of animals were then prepared in which a unilateral lesion in the PO area was combined with a contralateral lesion in the LH area. Plasma FFA response to 2-deoxyglucose in these rats was also blocked but not in rats having only unilateral lesions. The hyperglycemic response to 2-deoxyglucose was not affected in any of the experimental groups. These data suggest that a longitudinal pathway connecting PO, LH, and posterior hypothalamic areas is involved in FFA mobilization from adipose tissue in rats.


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