Adipose-specific peroxisome proliferator-activated receptor gamma knockout causes insulin resistance in fat and liver but not in muscle

Syndrome X, typified by obesity, insulin resistance (IR), dyslipidemia, and other metabolic abnormalities, is responsive to antidiabetic thiazolidinediones (TZDs). Peroxisome proliferator-activated receptor (PPAR) γ, a target of TZDs, is expressed abundantly in adipocytes, suggesting an important ro...

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Veröffentlicht in:Proceedings of the National Academy of Sciences - PNAS 2003-12, Vol.100 (26), p.15712-15717
Hauptverfasser: He, W, Barak, Y, Hevener, A, Olson, P, Liao, D, Le, J, Nelson, M, Ong, E, Olefsky, J.M, Evans, R.M
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container_title Proceedings of the National Academy of Sciences - PNAS
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creator He, W
Barak, Y
Hevener, A
Olson, P
Liao, D
Le, J
Nelson, M
Ong, E
Olefsky, J.M
Evans, R.M
description Syndrome X, typified by obesity, insulin resistance (IR), dyslipidemia, and other metabolic abnormalities, is responsive to antidiabetic thiazolidinediones (TZDs). Peroxisome proliferator-activated receptor (PPAR) γ, a target of TZDs, is expressed abundantly in adipocytes, suggesting an important role for this tissue in the etiology and treatment of IR. Targeted deletion of PPARγ in adipose tissue resulted in marked adipocyte hypocellularity and hypertrophy, elevated levels of plasma free fatty acids and triglyceride, and decreased levels of plasma leptin and ACRP30. In addition, increased hepatic glucogenesis and IR were observed. Despite these defects, blood glucose, glucose and insulin tolerance, and insulin-stimulated muscle glucose uptake were all comparable to those of control mice. However, targeted mice were significantly more susceptible to high-fat diet-induced steatosis, hyperinsulinemia, and IR. Surprisingly, TZD treatment effectively reversed liver IR, whereas it failed to lower plasma free fatty acids. These results suggest that syndrome X may be comprised of separable PPARγ-dependent components whose origins and therapeutic sites may reside in distinct tissues.
doi_str_mv 10.1073/pnas.2536828100
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subjects Adipocytes
Adipocytes - physiology
Adiponectin
adipose tissue
Adipose Tissue - drug effects
Adipose Tissue - physiology
Adipose tissues
Animals
Biological Sciences
Blood
blood glucose
blood lipids
Body fat
carbohydrate metabolism
fatty liver
Genetics
hypoglycemic agents
Hypoglycemic Agents - pharmacology
Insulin
Insulin resistance
Insulin Resistance - genetics
Intercellular Signaling Peptides and Proteins
leptin
Leptin - blood
Lipodystrophy - genetics
Liver
Liver - drug effects
Liver - physiology
Liver Function Tests
metabolic syndrome
Metabolic Syndrome - genetics
Mice
Mice, Knockout
Muscle, Skeletal - drug effects
Muscle, Skeletal - physiology
Muscles
mutants
Nonesterified fatty acids
Organ Specificity
phenotype
Proteins - metabolism
Receptors, Cytoplasmic and Nuclear - deficiency
Receptors, Cytoplasmic and Nuclear - genetics
Rodents
skeletal muscle
Syndrome X
thiazolidinedione
thiazolidinediones
Thiazolidinediones - pharmacology
transcription factors
Transcription Factors - deficiency
Transcription Factors - genetics
title Adipose-specific peroxisome proliferator-activated receptor gamma knockout causes insulin resistance in fat and liver but not in muscle
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