Abstract
To explore recent suggestions that genetically obese Zucker rats show less anorexia when brain γ-aminobutyric acid (GABA) is elevated, obese vs. lean littermates received 100, 50 and 0 μg of the GABA-transaminase inhibitor, ethanolamine-O-sulfate (EOS). intra-cisternally in a longitudinal design where their feeding patterns were monitored 24 h daily. Obese rats were refractory to EOS-induced anorexia as evidenced by less suppression of daily food intake and fewer alterations to both meal size and meal frequency, particularly in the night. This effect was not due to an inability of EOS to increase brain GABA since equivalent, specific dose-dependent increments were seen in the brains of separate obese vs. lean rats after analysis of endogenous GABA and seven other amino acids. An unexpected finding was elevated levels of brain taurine for obese rats regardless of EOS dosage, implying a hitherto unknown neurochemical trait whose potential significance is unclear. The primary data obtained provide further support for recent hypotheses that obese Zucker rats possess altered brain GABAergic mechanisms that may serve as one contributor to their over-eating.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 425-433 |
| Number of pages | 9 |
| Journal | International Journal of Obesity |
| Volume | 16 |
| Issue number | 6 |
| State | Published - 1992 |
| Externally published | Yes |
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Keywords
- Amino acids
- Circadian
- Circadian
- Ethanolamine-O-sulfate
- Feeding
- Meal frequency
- Meal size
- Taurine
ASJC Scopus subject areas
- Food Science
- Endocrinology
- Medicine (miscellaneous)
- Endocrinology, Diabetes and Metabolism
- Public Health, Environmental and Occupational Health
Cite this
Effects of increasing brain GABA on the meal patterns of genetically obese vs. lean Zucker rats. / Coscina, D. V.; Castonguay, T. W.; Stern, J. S.
In: International Journal of Obesity, Vol. 16, No. 6, 1992, p. 425-433.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of increasing brain GABA on the meal patterns of genetically obese vs. lean Zucker rats
AU - Coscina, D. V.
AU - Castonguay, T. W.
AU - Stern, J. S.
PY - 1992
Y1 - 1992
N2 - To explore recent suggestions that genetically obese Zucker rats show less anorexia when brain γ-aminobutyric acid (GABA) is elevated, obese vs. lean littermates received 100, 50 and 0 μg of the GABA-transaminase inhibitor, ethanolamine-O-sulfate (EOS). intra-cisternally in a longitudinal design where their feeding patterns were monitored 24 h daily. Obese rats were refractory to EOS-induced anorexia as evidenced by less suppression of daily food intake and fewer alterations to both meal size and meal frequency, particularly in the night. This effect was not due to an inability of EOS to increase brain GABA since equivalent, specific dose-dependent increments were seen in the brains of separate obese vs. lean rats after analysis of endogenous GABA and seven other amino acids. An unexpected finding was elevated levels of brain taurine for obese rats regardless of EOS dosage, implying a hitherto unknown neurochemical trait whose potential significance is unclear. The primary data obtained provide further support for recent hypotheses that obese Zucker rats possess altered brain GABAergic mechanisms that may serve as one contributor to their over-eating.
AB - To explore recent suggestions that genetically obese Zucker rats show less anorexia when brain γ-aminobutyric acid (GABA) is elevated, obese vs. lean littermates received 100, 50 and 0 μg of the GABA-transaminase inhibitor, ethanolamine-O-sulfate (EOS). intra-cisternally in a longitudinal design where their feeding patterns were monitored 24 h daily. Obese rats were refractory to EOS-induced anorexia as evidenced by less suppression of daily food intake and fewer alterations to both meal size and meal frequency, particularly in the night. This effect was not due to an inability of EOS to increase brain GABA since equivalent, specific dose-dependent increments were seen in the brains of separate obese vs. lean rats after analysis of endogenous GABA and seven other amino acids. An unexpected finding was elevated levels of brain taurine for obese rats regardless of EOS dosage, implying a hitherto unknown neurochemical trait whose potential significance is unclear. The primary data obtained provide further support for recent hypotheses that obese Zucker rats possess altered brain GABAergic mechanisms that may serve as one contributor to their over-eating.
KW - Amino acids
KW - Circadian
KW - Circadian
KW - Ethanolamine-O-sulfate
KW - Feeding
KW - Meal frequency
KW - Meal size
KW - Taurine
UR - http://www.scopus.com/inward/record.url?scp=0026667072&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0026667072&partnerID=8YFLogxK
M3 - Article
VL - 16
SP - 425
EP - 433
JO - International Journal of Obesity
JF - International Journal of Obesity
SN - 0307-0565
IS - 6
ER -