IN-VITRO [U-C-14]GLUCOSE UTILIZATION BY TISSUES OF WEANLING RATS WITHLATERAL HYPOTHALAMIC AREA LESIONS ONE MONTH AFTER LESION PRODUCTION

Citation
Ll. Bernardis et al., IN-VITRO [U-C-14]GLUCOSE UTILIZATION BY TISSUES OF WEANLING RATS WITHLATERAL HYPOTHALAMIC AREA LESIONS ONE MONTH AFTER LESION PRODUCTION, Japanese Journal of Physiology, 45(4), 1995, pp. 631-644
Citations number
35
Categorie Soggetti
Physiology
ISSN journal
0021521X
Volume
45
Issue
4
Year of publication
1995
Pages
631 - 644
Database
ISI
SICI code
0021-521X(1995)45:4<631:I[UBTO>2.0.ZU;2-W
Abstract
The role of the lateral hypothalamic area (LHA) in intermediary metabo lism was investigated by quantitation of [U-C-14]glucose oxidation to (CO2)-C-14 and C-14 incorporation into the glycogen and lipid fraction of the liver, epididymal fat pad, and diaphragm. Weanling male Spragu e-Dawley rats received bilateral electrolytic lesions in the LHA (LHAL rats). Sham-operated rats were either fed ad libitum (CON-ADLIB) or p air-gained to the LHAL rats (CON-PG). The experiment was terminated 1 month after lesion production. LHAL rats were significantly (SIG) ligh ter and shorter and ate less than CON-ADLIB; LHAL rats were also SIG s horter than CON-PG, pointing to a food intake-independent lesion effec t. Both LHAL and CON-PG rats had SIG less percent carcass fat than CON -ADLIB, but there was no SIG difference between LHAL and CON-PG rats. Also, LHAL rats had a SIG higher percentage of carcass protein than bo th CON-ADLIB and CON-PG. Furthermore, LHAL rats incorporated SIG less glucose into liver glycogen than CON-ADLIB but SIG more into CON-PG, w hereas CON-PG rats incorporated SIG less into liver glycogen than CON- ADLIB, again suggesting a food intake-independent effect. There was no difference among the groups in glucose oxidation and incorporation in to lipids and glycogen in both diaphragm and epididymal fat pads and l iver total lipid. However, livers of CON-PG metabolized SIG more [U-C- 14]glucose to CO2 than did livers of CON-ADLIB, suggesting a food inta ke-dependent effect. There was no difference between LHAL and CON-PG r ats in this parameter. These data indicate that the majority of the ch anges in weanling rats 1 month after LHAL must be due to the greatly r educed food intake precipitated by the lesions rather than some specif ic food intake-independent ''metabolic'' lesion effect.