toni vidal puig-lo último en obesidad
TRANSCRIPT
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University of Cambridge
Adipose tissue expandability,Lipotoxicity
and the Metabolic Syndrome
Toni Vidal-PuigInstitute of Metabolic [email protected]
International Symposium Latest in ObesityFundacion Ramon Areces
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Mechanical Problems
Lipotoxicity
Metabolic Syndrome
Adipocentric view of the Metabolic Syndrome
• Fatty liver• Diabetes• Heart Failure• Hypertension• Dyslipidaemia• Brain• Macrophages
Aesthetic and Psychological problems.
Metabolic problemsmismatch between energy availability and storage capacity
Obesity
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Our research programme is focused on understanding the link between obesity, insulin resistance and cardiometabolic complications.
Our hypothesis is that failure in adipose tissue expandability and functionality results in lipotoxicity.
We define lipotoxicity as ectopic accumulation of lipids in organs other than adipose tissue and believe that this ectopic lipid deposition is a major mechanism linking obesity and metabolic complications
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Framework for research:
Theme 1. Improving Adipose tissue expandability and function will prevent/reverse ectopic lipotoxicity.
Theme 2 Promoting Energy dissipation. Oxidising excess nutrients through different strategies will prevent the accumulation of toxic lipids.
Theme 3 Qualitative aspects of lipotoxicity matters. Converting lipid species to less toxic forms may prevent metabolic complications in the context of obesity.
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Adipose tissue expandability hypothesis (Virtue and Vidal-Puig. PLOS Bio(2008) BBA (Lipotoxicity issue)
a) The capacity to expand fat mass to store lipid is a more important determinant of obesity associated metabolic problems thanthe absolute amount of adipose tissue an individual possesses.
b) Point of maximal expansion determines fat leakage and ectopic storageleading to metabolic complications. LIPOTOXICITY
Adipose tissue expansion in not infinite
Lipid ‘spillover’
Adipokines
Caloric excess
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What factors may define adipose tissue expandability?
•Genetically determined number of preexisting preadipocytes•Genetic programs of preadipocyte recruitment and adipogenesis •Genetic programme of vasculogenesis/angiogenesis •Dysfunction of other cellular components within the adipose tissue.•Connective tissue/Extra cellular matrix
Connective tissueExpansion
Vasculogenesis
Programme of adipogenesis
Number of pre-adipocytes
Caloric excess and associated molecular
signals
Adipokine secretory profile
Dynamics of fat cell turnover in humans. Spalding and Arner P Nature 2008.
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Sethi & Vidal-Puig Chapter 3 In Metabolic Basis of Obesity 53-68 2011
Molecular players implicated in the transcriptional regulation of adipogenesis
ADIPOGENESIS PROGRAMME
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Local autocrine and paracrine signals regulate progenitor proliferation and titrate adipogenesis
Sethi JK, Diabetes 2010;59:2354-2357©2010 by American Diabetes Association
Christodoulides et al. J Cell Sci 2006Lagathu et al. Diabetes, 2009Lagathu et al. Int J Obes 2010
Xu et al. JBC, 1999Sethi et al. FEBS Let. 2000Christodoulides et al. Diabetologia 2006Cawthorn et al. Cell Death Differ 2007
TRITATION ADIPOGENESS
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Figure 23-4
AdhesionTransmigration
CaptureRolling
IntegrinsSelectin Ligands(PSGL-1)
Monocytes
Selectins(P/E-selectin)
V-CAMI-CAM
NeutrophilsLymphocytes
M1-likemacrophages
Activation
Chemokinegradient
ChemokinesCCL(2,5)
CXCL(1,2,8)
CytokinesIL-6
TNF-αIL-1β
ActivationAdipocytes
Necrotic adipocyte
PECAM-1Differentiation
M2-likemacrophages
“M2”markersCD206Arg1
“M1”markersCD11cNOS2
ChemokineReceptor
CCR(1-2-5)CXCR(1-2)
Mast cells
ECs
Lymphocytes
Adipose tissue inflammation
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Obese ATMs are filled with triglycerides & cholesterol
BODIPY F4/80 DAPI 16w ob/ob
Prieur X et al., Diabetes, 2011
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Macrophage Lipotoxicity
Prieur X, et al. Diabetes 60:797-809 (2011)
Fat spillover
Adiponectin
ARG1
EMC componentVascularisationTissue remodeling
M
M2
M2
M2 M2
M1M2
Fat spilloverM1
M2TNFa
M1
M2 TNFaM2
M2 M2
MacrophageLipid droplets
MM
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The concept of metabolic set pointEpidemiologically the risk of diabetes increases linearly with increased body weight.
Once an individual reaches their maximal adipose tissue mass, then metabolic complications ensue, suggesting that individuals would go from metabolically normal to metabolically compromised in a relatively small weight window.
Adipose tissue expandability hypothesis suggests this may not be the case for an individual.
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How the adipose tissue copes with expansion?Allostasis applied to the mechanisms controlling membrane lipid composition
Lipid composition of membranes – importance of phospholipids
Dynamic structures (growth, turnover, renewal)Heterogeneous structures ( lipid rafts)Communication Hubs for transduction pathways
•Compartmentalisation•Signal transduction•Cell adhesion•Lipid traffic•Ion channel function•Receptor mobility
Need for mechanisms of quality control
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Lipidomics as a hypothesis generator tool
From Pietilainen PLOS Biology 2011
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Research Article Association of Lipidome Remodeling in the Adipocyte Membrane with Acquired Obesity in Humans
Pietiläinen KH, Róg T, Seppänen-Laakso T, Virtue S, Gopalacharyulu P, et al. 2011 PLoS Biol 9(6): e1000623. doi:10.1371/journal.pbio.1000623
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22:4n-6
22:5n-6
18:4n-3
20:4n-3
14:0
16:0
18:0
20:0
16:1n-7
18:1
20:1
18:2n-6
18:3n-6
20:3n-6
20:4n-6
18:3n-3
20:5n-3
22:5n-3
22:6n-3
E
E
E
7
9 E
E
6
E
5
6
E
5
E
4
12:0E
*
**
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*
*
*
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Non-essential fatty acids Essential fatty acids
**
Fatty acids Markers of enzyme activities
**
A
B
Decreased in obese co-twins Increased in non-obese co-twins
Changes in desaturation and elongation in adipose tissue of obese and lean discordant twins
Unsaturation and elongation of fatty acids
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• The fatty acid elongase Elovl6 is highly expressed in brown adipose tissue (Moon et al., 2001).
• Elovl6 acts to convert C16 saturated and monounsaturated fatty acids to C18 fatty acids and can potentially affect over 50% of the cellular lipidome.
• Elovl6 product stearate has been implicated in the regulation of mitochondrial function (Senyilmaz et al., 2015).
Elovl6 mediated fatty acid elongation;
• Hypothesis: Elovl6 may act to regulate mitochondrial function and therefore thermogenesis in BAT.
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Decreased Maximal thermogenicCapacity in ELovl6 KO at Low T
Decreased Energy Expenditure in ELovl6 KO at Low T
Decreased NE stimulated glucose uptake
Decreased Gene expression analysis of electron transport chain complexes
Complex 1 Complex 2 Complex 3
Time
Virtue S, Cell Reports (in press) Tan et al Cell Reports (2015)
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• Role for the elongation of non-essential 16-carbon fatty acids to 18 carbon fatty acids in the adaption of brown adipose tissue to cold.
• In physiological states (Ageing/TNHFD) where beiging of white adipose tissue is prevented Elovl6 KO mice exhibit an impaired metabolic profile
• Ablation Elovl6, reduced overall maximal thermogenic capacity and led to compensatory beiging of white adipose tissue depots.
• Mice lacking Elovl6 had lower brown adipose tissue thermogenic capacity, which was associated with a reduction in expression on both an mRNA and a protein level of components of the mitochondrial electron transport chain.
Altogether these Data show
Tan et al Cell Reports (2015)
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D Senyilmaz et al. Nature 000, 1-5 (2015) doi:10.1038/nature14601
Drosophila lacking Elovl6 and C18:0 have impaired mitochondrial function.
Oxygen consumption
Survival
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D Senyilmaz et al. Nature 000, 1-5 (2015) doi:10.1038/nature14601
C18:0 is required for mitochondrial fusion.
Fragmentation index
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D Senyilmaz et al. Nature 000, 1-5 (2015) doi:10.1038/nature14601
C18:0 acts via TFR1, JNK and HUWE1 to regulate mitofusin.
Lack of ELovl6
C18:0
Activation of TFR1
Activation of JNK
Phosphorylation of HUWE1
Ubiquitination MFN2
Mitochondria fragmentation
ELovl6
C18:0
Inactivation of TFR1
Inactivation of JNK
No Phosphorylation of HUWE1
No Ubiquitination MFN2
No Mitochondria fragmentationIncreased Fusion
GAMBOGIC Acid
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Activating TFR1 with Gambogic in vivo directly impairs thermogenic capacity
Control
Gambogic
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Gambogic treatment reduces markers of thermogenesis and the mitochondrial ETC in BAT and scWAT.
BAT
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Brown fat activity modulators
Sanger Institute
TVPLab
LR11
BMP8b
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Browning thermogenic activation
Adrenergicreceptors
NRPreceptor
FGF/KLBreceptors
Metabolic fuel(lipid, glucose)
uptake/oxidation
Heat
Muscle Liver Heart Brain
FGF21Natriuretic peptides
Noradrenaline
SNS
Irisin
BMP8b
Preadipocytes BROWN/BEIGE ADIPOCYTE
Recent years there has been a burst in the identification of novel molecules and pathways controlling BAT activity
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Bone Morphogenetic Proteins (BMPs)
• Members of the TGF- super family
• Secreted proteins which bind type I and type II membrane receptors to regulate transcription via specific ‘Smad’ proteins.
LR11
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BMP8b is enriched in mature brown adipocytes and regulated by thermogenic stimuli
Tissue distribution
BAT fractionation
BAT
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BMP8b-/- mice have a reduced thermogenic response to HFD-feeding
Whittle et al, Cell, 2012
Body weights Energy expenditure
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NE-induced oxygen consumption in BMP8b-/- acclimated to 4oC is reduced
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“LR11 as a negative regulator of thermogenesis”
Collaboration with Bujo lab at TOHO university
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Background: LR11, an LDL receptor
• LDL receptor family • Multifunctional receptors• Cellular uptake of plasma lipoproteins – LDLR binds ApoB
and ApoE• All members have 1-4 clusters of ligand binding repeats
Yamakazi et al, 1996
• Brain• liver• kidney• WAT/BAT• smooth muscle cells
• Expression in brain positively regulated by docosahexenoic acid (DHA) (Ma et al, 2007)
Tissue distribution
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Model for regulated intramembrane proteolysis of LR11 or SorLA.
Christopher Böhm et al. J. Biol. Chem. 2006;281:14547-14553
©2006 by American Society for Biochemistry and Molecular Biology
Cell surface receptor
Metalloprotease TACE/ADAM17
Soluble form
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Fig.3
Subcutaneous fat
Liver
Epididymal fat
Mesenteric fat Brown fat
Retroperitoneal fat
LR11+/+ LR11-/- LR11+/+ LR11-/- LR11+/+ LR11-/- LR11+/+ LR11-/-
LR11+/+ LR11-/-
LR11+/+ LR11-/-
LR11+/+ LR11-/- LR11+/+ LR11-/-
D PHENOTYPING OF THE LR11 KO MOUSE
Whitle et al Nat Communication 2015
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LR11-/- mice show resistance to diet-induced obesity and have increased energy expenditure
Dr. Andrew Whittle and Dr. Meizi Jiang
Body weights Energy expenditure
Whitle et al Nat Communication 2015
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“Browning” in LR11-/- subcutaneous white adipose tissue
H&E Whitle et al Nat Communication 2015
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NE-induced oxygen consumption is increased in HFD-fed LR11-/- mice raised at thermoneutrality
Whitle et al Nat Communication 2015
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LR11 regulates brown adipocyte oxygen consumption in vitro
Dr. Andrew Whittle and Dr. Meizi Jiang
Primary brown adipocytes differentiated from the stromal vascular fraction of wild-type or LR11-/- BAT, and from wild-type BAT treated with or without soluble LR11 (10 ng/mL) throughout differentiation, stimulated with NE (100 nM).
WT v. LR11-/-
brown adipocytesControl v. sLR11 treated
wild-type brown adipocytes
functional consequences
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LR11 antagonizes BMP signalling in White adipocytes
LR11-/- white adipocytes have a greater increase in thermogenic gene expression in response to BMP7 treatment. This response is blocked in both LR11-/- and wild-type white adipocytes with sLR11 treatment.
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Conclusions: LR11, a *negative* regulator of thermogenesis.
• LR11 is a bona fide negative regulator of thermogenesis
• Its expression in adipose tissues with thermogenic potential suggests it plays an important role in negatively regulating thermogenesis, which if left unchecked could result in hyperthermia or severe energy depletion.
• In the absence of LR11, as in LR11-/-, the thermogenic programme is left unchecked, leading to increased recruitment of brown adipocytes.
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Conclusions
• Proper Adipose tissue function requires coordinated interaction between adipocytes, precursors, immune cells, blood vessels, nerves and ECM
• Obesity alters the ultrastructure and cellular composition of WAT affecting its function and impairing the capacity to buffer excess of nutrients.
• BAT could eliminate the excess of nutrients improving WAT function
• Qualitative alterations of Lipids are important
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Ana Pirraco Agnes Lukasik Martin Dale Stefania Carobbio Sergio Rodriguez-Cuenca
Katie Ketteridge-Lowe Crystal Mok Sam Virtue Toni Vidal-Puig Vivian Peirce Keli Phillips
Chong Yew Tan Mark Campbell Guillaume Bidault Maarten Soeters Vanessa Pellegrinelli Camilla Ingvorsen
Conall Dennedy
TVPLab (@TVPLab) | Twitterhttps://twitter.com/tvpla
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Leo KrallJeff FlierDavid MollerBrad LowellThilo HagenChen Yu Zhang
Manuel MunozSerrano RiosPatxi Sanchez FrancoAlberto LeivaJose Antonio VazquezRafael Carmena
Gema MedinaMiguel LopezNuria BarbarrojaAntonio CamargoJoana Relat-Pardo
Hideaki BujoRudy ZechnerAurelio TelemanFrancesc VillarroyaAntonio ZorzanoFernandez RealMatej OresicJoaquin DopazoJuan Antonio PaniaguaAntonio MoschettaUlf SmithMartin BrandLluis FajasGemma FrubeckAlessadro BartolomucciDiego HaroPedro MarreroBarbara CannonKamal RahmuniCarlos DieguezManuel RosMercedes RicoteThorkild SorensenJackie StephensAndrew Goldberg
S O’RahillyJasswinder SethiJules GriffinBarry Rosen
Andrew WhitleViv PierceChris LelliotAlberto CamachoIshikawa KMeirhaeghe ARachel HagenRomina BoianiCostas christodulidesNadeene ParkerAdrienne KisClaire LagathuMark SlawickSarah GrayKiara CurtisCiaran SewterEdouardo de la NoraCrystal MockMatthias LaudesSarawutt Jitrapakdee
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IMS, University of Cambridge• Andrew Whittle• Viv Pierce• Stefania Carobbio• Vanessa Pellegrinelli• Sam Virtue
Dep of Biochemistry, University of Cambridge• Houjiang Zhou• Kathryn Lilley
University of Cardiff• Matthew White• Alun Davies
University of Barcelona• Joana RelatWGI• Barbara Cannon
Toho University• Hideaki Bujo
Chiba University• Meizi Jiang• Wolfgang Schneider
Acknowledgements
Sanger Institute
• Chris Lelliott• Camilla Ivrognsen UIOWA
Kamal RahmouniDonald Morgan
USCMiguel LopezLuis MartinsRosalia Gallego
Medical Research CouncilBritish Heart FoundationWellcomeERC EU-FP7 Etherpath2020 BetaBat2020 EpooS
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Cherry Hinton Lions TVPLab