Studies on the anti-obesity activity of zinc-α2-glycoprotein in the rat

Steven Russell, Michael Tisdale

Research output: Contribution to journalArticle

Abstract

OBJECTIVE: To investigate the anti-obesity effect of the adipokine zinc-a(2)-glycoprotein (ZAG) in rats and the mechanism of this effect.
SUBJECTS: Mature male Wistar rats (540 ± 83 g) were administered human recombinant ZAG (50 µg per 100 g body weight given intravenously daily) for 10 days, while control animals received an equal volume of phosphate-buffered saline (PBS).
RESULTS: Animals treated with ZAG showed a progressive decrease in body weight, without a decrease in food and water intake, but with a 0.4 °C rise in body temperature. Body composition analysis showed loss of adipose tissue, but an increase in lean body mass. The loss of fat was due to an increase in lipolysis as shown by a 50% elevation of plasma glycerol, accompanied by increased utilization of non-esterified fatty acids, as evidenced by the 55% decrease in plasma levels. Plasma levels of glucose and triglycerides were also reduced by 36-37% and there was increased expression of the glucose transporter 4 in both skeletal muscle and adipose tissue. Expression of the lipolytic enzymes adipose triglyceride lipase and hormone-sensitive lipase in the white adipose tissue (WAT) were increased twofold after ZAG administration. There was almost a twofold increased expression of uncoupling proteins 1 and 3 in brown adipose tissue and WAT, which would contribute to increased substrate utilization. Administration of ZAG increased ZAG expression twofold in the gastrocnemius muscle, BAT and WAT, which was probably necessary for its biological effect.
CONCLUSION: These results show that ZAG produces increased lipid mobilization and utilization in the rat.
LanguageEnglish
Article numberPMID:20856251
Pages658-665
Number of pages7
JournalInternational Journal of Obesity
Volume35
Issue number5
DOIs
Publication statusPublished - May 2011

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White Adipose Tissue
Zinc
Glycoproteins
Obesity
Adipose Tissue
Skeletal Muscle
Lipid Mobilization
Body Weight
Sterol Esterase
Adipokines
Brown Adipose Tissue
Facilitative Glucose Transport Proteins
Lipolysis
Body Composition
Body Temperature
Lipase
Glycerol
Drinking
Wistar Rats
Triglycerides

Keywords

  • zinc-alpha 2-glycoprotein
  • rats

Cite this

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abstract = "OBJECTIVE: To investigate the anti-obesity effect of the adipokine zinc-a(2)-glycoprotein (ZAG) in rats and the mechanism of this effect.SUBJECTS: Mature male Wistar rats (540 ± 83 g) were administered human recombinant ZAG (50 µg per 100 g body weight given intravenously daily) for 10 days, while control animals received an equal volume of phosphate-buffered saline (PBS).RESULTS: Animals treated with ZAG showed a progressive decrease in body weight, without a decrease in food and water intake, but with a 0.4 °C rise in body temperature. Body composition analysis showed loss of adipose tissue, but an increase in lean body mass. The loss of fat was due to an increase in lipolysis as shown by a 50{\%} elevation of plasma glycerol, accompanied by increased utilization of non-esterified fatty acids, as evidenced by the 55{\%} decrease in plasma levels. Plasma levels of glucose and triglycerides were also reduced by 36-37{\%} and there was increased expression of the glucose transporter 4 in both skeletal muscle and adipose tissue. Expression of the lipolytic enzymes adipose triglyceride lipase and hormone-sensitive lipase in the white adipose tissue (WAT) were increased twofold after ZAG administration. There was almost a twofold increased expression of uncoupling proteins 1 and 3 in brown adipose tissue and WAT, which would contribute to increased substrate utilization. Administration of ZAG increased ZAG expression twofold in the gastrocnemius muscle, BAT and WAT, which was probably necessary for its biological effect.CONCLUSION: These results show that ZAG produces increased lipid mobilization and utilization in the rat.",
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Studies on the anti-obesity activity of zinc-α2-glycoprotein in the rat. / Russell, Steven; Tisdale, Michael.

In: International Journal of Obesity , Vol. 35, No. 5, PMID:20856251, 05.2011, p. 658-665.

Research output: Contribution to journalArticle

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