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Adipose-Specific Knockout of raptor Results in Lean Mice with Enhanced Mitochondrial Respiration
Open accessAbstract
raptor is a specific and essential component of mammalian TOR complex 1 (mTORC1), a key regulator of cell growth and metabolism. To investigate a role of adipose mTORC1 in regulation of adipose and whole-body metabolism, we generated mice with an adipose-specific knockout of raptor (raptor(ad-/-)). Compared to control littermates, raptor(ad-/-) mice had substantially less adipose tissue, were protected against diet-induced obesity and hypercholesterolemia, and exhibited improved insulin sensitivity. Leanness was in spite of reduced physical activity and unaffected caloric intake, lipolysis, and absorption of lipids from the food. White adipose tissue of raptor(ad-/-) mice displayed enhanced expression of genes encoding mitochondrial uncoupling proteins characteristic of brown fat. Leanness of the raptor(ad-/-) mice was attributed to elevated energy expenditure due to mitochondrial uncoupling. These results suggest that adipose mTORC1 is a regulator of adipose metabolism and, thereby, controls whole-body energy homeostasis.
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“Knocking out the Raptor complex in adipose tissue enhances mitochondrial respiration244, but muscle-specific knockout causes muscular dystrophy in mice36.”
From Mitochondrial and metabolic dysfunction in ageing and age-related diseases (2022) · cites this paper as [244]
In the citing paper
“Adipose-specific Raptor knockout mice (Raptorad−/−) have a lean phenotype and are protected against diet-induced obesity, due to enhanced energy expenditure facilitated by UCP1-mediated mitochondrial uncoupling244.”
From Mitochondrial and metabolic dysfunction in ageing and age-related diseases (2022) · cites this paper as [244]
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“Discussion The striking resemblance of the spmd phenotype to the phenotypes of muscle- and adipose-specific Raptor mutants (13, 14), together with significantly diminished levels of phosphorylation on 4E-BP1 and S6 in spmd tissues, provides strong evidence that Samd4 plays an important role in metabolic regulation in…”
BackgroundEndostatin Prevents Dietary-Induced Obesity by Inhibiting Adipogenesis and Angiogenesis
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“Adipose tissue–specific mTORC1 knockout mice were lean and resistant to dietary-induced obesity (36).”
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BackgroundHDAC5 promotes optic nerve regeneration by activating the mTOR pathway
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“, 2002), by expressing AAV-Cre in the RGC of Raptor floxed mice (Polak et al., 2008) (Figure 5D, E and F).”
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“Consistent with our studies, the knockdown of raptor inhibited adipogenesis in 3T3-L1 cells (38), while loss of TSC2 enhanced 3T3-L1 differentiation (39).”
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“In addition, the ablation of raptor in murine adipose tissue produced an increase in mitochondrial respiration through the enhanced expression of uncoupling protein 1 (UCP1) (30).”
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“mice exhibited the phenotype of resistance to dietaryinduced obesity (31).”
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“Inactivation of mTORC1 in WAT caused the browning and reduction of fat, resulted in an increase in energy expenditure, and Akt/PKB-dependent insulin sensitivity [28].”
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“Loss of raptor in fat led to browning of WAT (Polak et al. 2008).”
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“In addition, fat-specific knockout (with aP2-Cre) of raptor enhances UCP1 expression and energy expenditure (16).”
BackgroundMa, S., Venkatesh, A., Langellotto, F., Le, Y. Z., Hall, M. N., Rüegg, M. A., & Punzo, C. (2015) · Experimental Eye Research · doi:10.1016/j.exer.2015.04.006 · Cited by 36
“Tissues with a high metabolic rate, high protein synthesis rate or a high cell division rate are generally quite affected by loss of Raptor (Cloetta et al., 2013; Polak et al., 2008; Shende et al., 2011).”
Self-citationMammalian target of rapamycin is essential for cardiomyocyte survival and heart development in mice
Zhang, P., Shan, T., Liang, X., Deng, C., & Kuang, S. (2014) · Biochemical and Biophysical Research Communications · doi:10.1016/j.bbrc.2014.08.046 · Cited by 35
“mTORC2 regulates cell growth and survival, actin cytoskeleton reorganization, protein synthesis and maturation, and metabolism via AKT and PKC-α pathway [9,10].”
BackgroundRegulation of Adipocyte and Macrophage Functions by mTORC1 and 2 in Metabolic Diseases
Festuccia, W. T. (2020) · Molecular Nutrition & Food Research · doi:10.1002/mnfr.201900768 · Cited by 35
Nutrigenetics and Nutrigenomics of Caloric Restriction
Abete, I., Navas‐Carretero, S., Martí, A., & Martínez, J. A. (2012) · Progress in molecular biology and translational science · doi:10.1016/b978-0-12-398397-8.00013-7 · Cited by 36
The Proton-Coupled Monocarboxylate Transporter Hermes Is Necessary for Autophagy during Cell Death
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“Here we show that hermes induces similar metabolic changes and mTOR signaling. mTOR signaling is a key nutrient sensing pathway, and increased activation of mTOR has been linked to insulin resistance and type 2 diabetes (Polak et al., 2008; Um et al., 2004).”
BackgroundFeast and famine: Adipose tissue adaptations for healthy aging
Lettieri‐Barbato, D., & Aquilano, K. (2016) · Ageing Research Reviews · doi:10.1016/j.arr.2016.05.007 · Cited by 35
“As consequence they have less adipose tissue, are resistant to weight gain even on a high-fat diet, and display improved metabolic parameters that could lead to life extension (Polak et al., 2008).”
BackgroundChayama, Y., Ando, L., Sato, Y., Shigenobu, S., Anegawa, D., Fujimoto, T., Hiroki, T., Tamura, Y., Miura, M., & Yamaguchi, Y. (2019) · Frontiers in Physiology · doi:10.3389/fphys.2018.01973 · Cited by 34
Resveratrol-induced brown fat-like phenotype in 3T3-L1 adipocytes partly via mTOR pathway
Liu, Z., Liao, W., Yin, X., Zheng, X., Li, Q., Zhang, H., Zheng, L., & Feng, X. (2020) · Food & Nutrition Research · doi:10.29219/fnr.v64.3656 · Cited by 34
“(25) reported that adipocyte-specific mTOR-knockout or raptor-knockout decreased the weight of WATs and induced WAT-browning.”
BackgroundInducible raptor and rictor Knockout Mouse Embryonic Fibroblasts
Cybulski, N., Zinzalla, V., & Hall, M. N. (2011) · Methods in molecular biology · doi:10.1007/978-1-61779-430-8_16 · Cited by 34
Self-citationden Hartigh, L. J., Goodspeed, L., Wang, S. A., Kenerson, H. L., Omer, M., O’Brien, K. D., Ladiges, W., Yeung, R. S. W., & Subramanian, S. (2018) · Experimental Physiology · doi:10.1113/ep087207 · Cited by 33
“Deletion of the adipocyte-specific mTORC1 protein Raptor results in mice that are lean and insulin sensitive with enhanced fatty acid oxidation (Polak et al., 2008); likewise, whole-body deletion of S6K1, the downstream substrate of mTORC1, improves insulin sensitivity and extends lifespan in mice…”
InfluentialmTORC1 in energy expenditure: consequences for obesity
Allard, C., Miralpeix, C., López-Gambero, A. J., & Cota, D. (2024) · Nature Reviews Endocrinology · doi:10.1038/s41574-023-00934-0 · Cited by 39
“Obesity is characterized by sustained mTORC1 activity in peripheral organs, such as adipose tissue, the liver and the muscle 119,120 .”
Metabolic Regulation, Mitochondria and the Life-Prolonging Effect of Rapamycin: A Mini-Review
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Mukaida, S., Evans, B. A., Bengtsson, T., Hutchinson, D. S., & Sato, M. (2016) · Pharmacological Research · doi:10.1016/j.phrs.2016.12.022 · Cited by 33
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“Likewise, the potential of raptor null mouse embryonic fibroblasts to differentiate into adipocytes is impaired [122].”
BackgroundShi, F., & Collins, S. (2023) · International Journal of Molecular Sciences · doi:10.3390/ijms241411497 · Cited by 34
“Polak and colleagues reported that adipose-specific Raptor knockout mice had substantially less adipose tissue, elevated energy expenditure proposed to be due to mitochondrial uncoupling, were protected against diet-induced obesity, hypercholesterolemia, and insulin resistance [74].”
BackgroundBeg, M., Shankar, K., Varshney, S., Rajan, S., Singh, S. P., Jagdale, P. R., Puri, A., Chaudhari, B. P., Sashidhara, K. V., & Gaikwad, A. N. (2014) · Molecular and Cellular Endocrinology · doi:10.1016/j.mce.2014.09.024 · Cited by 32
“Knockdown of Raptor leads to reduction in mTOR as well as adipogenesis (Polak et al., 2008).”
Nesfatin-1 promotes brown adipocyte phenotype
Wang, Y., Li, Z., Zhang, X., Xiang, X., Li, Y., Mulholland, M. W., & Zhang, W. (2016) · Scientific Reports · doi:10.1038/srep34747 · Cited by 31
Quercetin improves oxidative stress-induced pancreatic beta cell alterations via mTOR-signaling
Dhanya, R., & Kartha, C. S. (2021) · Molecular and Cellular Biochemistry · doi:10.1007/s11010-021-04193-3 · Cited by 31
Branched‐Chain Amino Acids and Mitochondrial Biogenesis: An Overview and Mechanistic Summary
Hinkle, J. S., Rivera, C. N., & Vaughan, R. A. (2022) · Molecular Nutrition & Food Research · doi:10.1002/mnfr.202200109 · Cited by 31
Egr1 mediates the effect of insulin on leptin transcription in adipocytes
Mohtar, O., Ozdemir, C., Roy, D., Shantaram, D., Emili, A., & Kandror, K. V. (2019) · Journal of Biological Chemistry · doi:10.1074/jbc.ac119.007855 · Cited by 32
Ribosome impairment regulates intestinal stem cell identity via ZAKɑ activation
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Dictyostelium, a microbial model for brain disease
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“In other organisms, TORC1 exerts transcriptional and translational control to activate cell growth, proliferation and to inhibit autophagy and mitochondrial biogenesis [83, 87-88].”
BackgroundmTORC1 restrains adipocyte lipolysis to prevent systemic hyperlipidemia
Paolella, L. M., Mukherjee, S., Tran, C. M., Bellaver, B., Hugo, M., Luongo, T. S., Shewale, S. V., Lu, W., Chellappa, K., & Baur, J. A. (2019) · Molecular Metabolism · doi:10.1016/j.molmet.2019.12.003 · Cited by 33
“Genetic ablation of adipocyte mTORC1 with AP2-Cre resulted in lean mice that were protected from hypercholesterolemia [27].”
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Targeting mTOR Signaling in Type 2 Diabetes Mellitus and Diabetes Complications
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Mitochondria in response to nutrients and nutrient-sensitive pathways
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“A similar phenotype was described in a mouse model with an adipose-specific ablation of Raptor activity: mice with a raptordeficient adipose tissue had increased mitochondrial respiration, caused by the upregulation of mitochondrial uncoupling in the white adipose tissue (Polak et al., 2008).”
BackgroundTargeting mTOR Signaling by Dietary Polyphenols in Obesity Prevention
Cao, Y., Han, S., Lu, H., Luo, Y., Guo, T., Wu, Q., & Luo, F. (2022) · Nutrients · doi:10.3390/nu14235171 · Cited by 28
Targeted suppression of mTORC2 reduces seizures across models of epilepsy
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“This increase in mTORC2 activity upon Rptor deletion is due to the absence of the inhibitory feedback onto IRS1-PI3K, which is an inherent feature of mTOR signaling 54 – 57 .”
Maternal diabetes promotes mTORC1 downstream signalling in rabbit preimplantation embryos
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PLD1 regulates adipogenic differentiation through mTOR - IRS-1 phosphorylation at serine 636/639
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Metadata
- Authors
- Polak, P., Cybulski, N., Feige, J. N., Auwerx, J., Rüegg, M. A., & Hall, M. N.
- Affiliations
- University of Basel (CH)
- Centre National de la Recherche Scientifique (FR)
- Corresponding author
- Hall, Michael N.
- Venue
- Cell Metabolism
- Publisher
- Elsevier BV
- Published
- 2008-11
- Volume
- 8
- Issue
- 5
- Pages
- 399-410
- ISSN
- 1550-4131 (ISSN-L)
- OpenAlex
- W2124802842
- Cited by
- 480
- References
- 71
- Citations by year
- 2026: 3 · 2025: 13 · 2024: 17 · 2023: 12 · 2022: 21 · 2021: 23 · 2020: 31 · 2019: 23 · 2018: 26 · 2017: 46 · 2016: 32 · 2015: 35 · 2014: 43 · 2013: 37 · 2012: 38
- FWCI
- 17.61
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Cell Metabolism (publishedVersion)
- PubMed (publishedVersion)
- edoc (University of Basel) (acceptedVersion)
- HAL (submittedVersion)
- Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion)
- Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion, cc-by-nc-nd)
- edoc (University of Basel)
- Funders
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Topics
- Health Sciences › Medicine › Physiology (medical) › Adipose Tissue and Metabolism
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adipokines, Inflammation, and Metabolic Diseases
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
- Keywords
- raptors, mTORC1, white adipose tissue, mitochondrial uncoupling, brown adipose tissue, energy expenditure, diet-induced obesity, hypercholesterolemia, insulin sensitivity
- MeSH terms
- Mechanistic Target of Rapamycin Complex 1, Regulatory-Associated Protein of mTOR, Animals, Adipose Tissue, Brown, Carrier Proteins, Dietary Fats, Energy Metabolism, Hypercholesterolemia, Insulin, Male, Mitochondria, Obesity, Organ Specificity, Proteins, Transcription Factors, Mice, Knockout, Cell Respiration, Sirolimus, 3T3-L1 Cells, Multiprotein Complexes, Adaptor Proteins, Signal Transducing, Mice, Adipose Tissue, White, TOR Serine-Threonine Kinases
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