| 1998 |
PPARγ was identified as the major functional receptor for the thiazolidinedione class of insulin-sensitizing drugs; ligand binding by PPARγ leads to cofactor docking in a ligand-dependent fashion, regulating transcriptional activity in adipogenesis and systemic insulin action. |
Nuclear receptor biochemistry, ligand binding assays, transcriptional reporter assays |
Diabetes |
High |
9568680
|
| 2002 |
Upon activation, PPARγ heterodimerizes with retinoid X receptor (RXR), recruits specific cofactors, and binds to PPAR-responsive DNA elements to stimulate transcription of target genes involved in glucose and lipid metabolism. |
Co-immunoprecipitation, reporter assays, chromatin immunoprecipitation |
Annual review of nutrition |
High |
12055342
|
| 2005 |
PPARγ activity is regulated by ERK1/2-mediated phosphorylation of a serine residue, which attenuates its transactivation function; additionally, mitogen-activated MEK1/2 interacts directly with nuclear PPARγ and exports it from the nucleus via MEK's N-terminal nuclear export signal, providing a nucleo-cytoplasmic shuttling mechanism. |
Co-immunoprecipitation, subcellular fractionation, phosphorylation assays, nuclear export signal mutagenesis |
Cell cycle (Georgetown, Tex.) |
Medium |
17611413
|
| 2008 |
FABP4 triggers the ubiquitination and subsequent proteasomal degradation of PPARγ, thereby downregulating PPARγ protein levels; FABP4-null preadipocytes show increased PPARγ expression and enhanced adipogenesis, and complementation of FABP4 reverses this. |
Ubiquitination assays, proteasome inhibitor experiments, FABP4 knockout and complementation in preadipocytes and macrophages, Western blotting |
Diabetes |
High |
24319114
|
| 2008 |
Klotho is a direct transcriptional target of PPARγ; a noncanonical PPAR-responsive element in the 5'-flanking region of the human klotho gene was identified by ChIP and gel shift assays, and PPARγ agonists increased klotho expression in vivo in mouse kidneys. |
Chromatin immunoprecipitation (ChIP), electrophoretic mobility shift assay (EMSA), promoter-reporter assays, siRNA knockdown, in vivo adenovirus overexpression |
Kidney international |
High |
18547997
|
| 2008 |
TNF-α inhibits PPARγ activity via activation of serine kinases including IKK, ERK, JNK, and p38; IKK acts as a dominant regulator by both inhibiting PPARγ expression and activating PPARγ corepressors. |
Kinase activity assays, gene expression analysis, pharmacological kinase inhibition |
Biochemical and biophysical research communications |
Medium |
18655773
|
| 2008 |
HDAC1 and HDAC3 are recruited to the PPARG2 promoter via sumoylated CEBPD (sumoylation at lysine 120 by SUMO1), forming a repressor complex that inactivates PPARG2 transcription; non-sumoylated CEBPD reverses this repression to activate PPARG2 during hepatic lipogenesis. |
5'-serial deletion reporter assays, ChIP, co-immunoprecipitation of CEBPD-HDAC1/HDAC3, sumoylation mutant analysis |
Biochimica et biophysica acta |
High |
18619497
|
| 2012 |
PPARγ directly binds to the promoters of hexokinase 2 (HK2) and pyruvate kinase M2 (PKM2) to activate their transcription in PTEN-null fatty liver; this activity and liver steatosis/tumorigenesis are under control of Akt2 kinase upstream. |
Chromatin immunoprecipitation, promoter binding assays, genetic mouse models (PTEN-null, Akt2 knockout) |
Nature communications |
High |
22334075
|
| 2013 |
Lipin1 directly interacts with PPARγ through a VXXLL motif (residue 885) and a C-terminal region (residues 825–926), releasing co-repressors NCoR1 and SMRT from PPARγ in the absence of ligand, thereby activating PPARγ transcriptional activity and enhancing adipocyte differentiation; a novel transcriptional activation domain (TAD, residues 217–399) unique to lipin1 mediates PPARγ activation but not PPARα. |
Co-immunoprecipitation, pulldown, reporter assays, domain mutagenesis (VXXLL mutant), chromatin immunoprecipitation |
The Biochemical journal |
High |
23627357
|
| 2014 |
Thrap3 (thyroid hormone receptor-associated protein 3) directly interacts with PPARγ when it is phosphorylated at Ser273 by CDK5; this interaction controls CDK5-mediated diabetic gene programming in adipocytes, including dysregulation of adiponectin and adipsin. |
Co-immunoprecipitation, mass spectrometry, siRNA knockdown, antisense oligonucleotide treatment in vivo, gene expression profiling |
Genes & development |
High |
25316675
|
| 2014 |
Gcn5 and PCAF acetyltransferases act upstream of PPARγ to facilitate adipogenesis by regulating RNA polymerase II elongation of PPARγ transcripts; double knockout of Gcn5/PCAF inhibits PPARγ expression and prevents adipocyte differentiation, which is rescued by ectopic PPARγ expression. |
Genetic knockout (double KO), ectopic PPARγ expression rescue, RNA pol II ChIP, quantitative gene expression |
Molecular and cellular biology |
High |
25071153
|
| 2015 |
Structural analysis of PPARγ revealed the mechanism by which the antagonist SR1664 actively antagonizes PPARγ; this enabled development of SR2595 as an inverse agonist that represses PPARγ and promotes osteogenic differentiation of bone marrow-derived mesenchymal stem cells. |
X-ray crystallography, structural biology, cell differentiation assays with bone marrow-derived MSCs |
Nature communications |
High |
26068133
|
| 2015 |
PPARγ protein and mRNA are present within sensory axons; after sciatic nerve injury, PPARγ protein levels increase in axons with increased retrograde transport via association with dynein, and PPARγ accumulates in the nucleus of sensory neuron cell bodies; PPARγ antagonists attenuate axonal regeneration. |
Immunofluorescence localization, subcellular fractionation, retrograde transport assays, co-immunoprecipitation with dynein, loss-of-function with PPARγ antagonists |
Developmental neurobiology |
Medium |
26446277
|
| 2016 |
Post-translational modifications of PPARγ at S112 and S273 differentially regulate bone biology: pS112 controls osteoblastic activity and pS273 controls osteoclastic activity; the inverse agonist SR10171 blocks pS273 but not pS112, increasing trabecular/cortical bone and normalizing metabolic parameters in vivo. |
In vivo mouse models (normoglycemic and hyperglycemic), phospho-specific antibodies, bone histomorphometry, pharmacological intervention |
EBioMedicine |
Medium |
27422345
|
| 2016 |
PPARγ directly binds to PPAR-responsive elements (PPRE) in the FXR gene promoter in adipocytes (demonstrated by ChIP), activating FXR expression in a PPARγ agonist-dependent manner; FXR in turn binds FXRE in the SCD gene promoter to promote lipogenesis. |
Chromatin immunoprecipitation (ChIP), promoter reporter assays, site mutagenesis |
Biochemical and biophysical research communications |
Medium |
32446390
|
| 2017 |
CACUL1 directly binds to PPARγ through a CoRNR box 2 motif and represses PPARγ transcriptional activity and adipogenesis; CACUL1 depletion results in increased histone H3K9 acetylation and decreased H3K9 methylation at PPARγ-responsive gene promoters, through reciprocal regulation of SIRT1 and LSD1 recruitment. |
Co-immunoprecipitation, ChIP for histone marks, RNA-seq, siRNA knockdown, domain mutagenesis |
Cell death & disease |
High |
29233982
|
| 2018 |
MAGED1 directly binds to PPARγ and suppresses its stability and transcriptional activity; MAGED1-deficient mice show increased PPARγ protein levels, more adipocyte precursors, and hyperplasia of white adipose tissue, along with improved insulin sensitivity. |
Co-immunoprecipitation, protein stability assays, MAGED1 knockout mice, gene expression analysis |
The Journal of endocrinology |
Medium |
30121577
|
| 2020 |
Structural and conformational analysis (X-ray crystallography, NMR, HDX, MD simulations, site-directed mutagenesis) revealed that CDK5 phosphorylates PPARγ at S245 (equivalent to S273 in full-length); ligand binding can allosterically block CDK5 interaction with PPARγ from a distal site, inhibiting phosphorylation via conformational change. |
X-ray crystallography, NMR, HDX, protein-protein docking, MD simulations, site-directed mutagenesis |
Journal of medicinal chemistry |
High |
32239932
|
| 2020 |
TMEM18 activates PPARG, particularly upregulating PPARG1 promoter activity; TMEM18 knockdown impairs adipocyte formation in zebrafish and human preadipocytes, placing TMEM18 upstream of PPARγ as a regulator of adipogenesis. |
Promoter reporter assays, siRNA knockdown, zebrafish loss-of-function, human preadipocyte differentiation assays |
Cell reports |
Medium |
33086065
|
| 2021 |
PPARγ in osteocytes is essential for sclerostin (SOST) production; PPARγ directly binds to PPREs in the 8 kb upstream region of the Sost gene promoter, as shown by ChIP; osteocyte-specific PPARγ deletion (γOTKO) results in increased bone mass, reduced bone marrow adiposity, and protection from TZD-induced bone loss. |
Osteocyte-specific conditional knockout mice (Dmp1Cre), ChIP for PPARG binding at Sost promoter PPREs, site mutagenesis, gene expression correlation analysis |
Bone |
High |
33722775
|
| 2009 |
PPARγ activation by rosiglitazone in macrophages represses fractalkine receptor (FR) gene transcription and prevents FR plasma membrane translocation; in endothelial cells, rosiglitazone impedes nuclear export of fractalkine (FKN), revealing a novel anti-inflammatory mechanism of PPARγ. |
Gene expression analysis, subcellular fractionation/immunofluorescence for receptor localization, nuclear export assays |
Journal of molecular endocrinology |
Medium |
19850645
|
| 2009 |
PPARγ modulates hypothalamic TRH regulation in vivo; PPARγ agonist injection modified TRH-luc transcription in newborn mouse hypothalamus; PPARγ overexpression abrogated T3-dependent Trh repression, while RXRα overexpression rescued this effect, indicating competition for RXR as a mechanism of crosstalk between PPARγ and TRβ. |
In vivo intracerebral injection, reporter gene (TRH-luc) assay, shRNA knockdown, adenoviral overexpression, qPCR |
Molecular and cellular endocrinology |
Medium |
19900503
|
| 2022 |
C/EBPβ (LAP* and LAP isoforms) together with CSF2 signaling selectively induces expression of Pparg isoform 2 but not isoform 1 in alveolar macrophages; C/EBPβ-deficient AMs show severe defects in proliferation, phagocytosis, and lipid metabolism causing a PAP-like syndrome. |
Transcriptome analysis, chromatin accessibility (ATAC-seq), conditional knockout mice, functional assays (proliferation, phagocytosis, lipid metabolism) |
Science immunology |
Medium |
36112694
|
| 2016 |
PPARγ activation with rosiglitazone stimulates lipid synthesis in mouse meibocytes, associated with SUMO1 sumoylation of the 72 kDa PPARγ isoform and its cytoplasmic accumulation; loss of cytoplasmic PPARγ was observed in aged atrophic meibomian glands. |
Subcellular fractionation, immunoblotting (anti-SUMO1), CARS/Raman microspectroscopy, LipidTox staining, mRNA quantification |
The ocular surface |
Medium |
27531629
|
| 2021 |
Pparg activation in basal bladder urothelial progenitors induces superficial cell formation and cell cycle exit, preventing tumor formation; however, in injury-activated progenitors, Pparg activation results in luminal tumor formation that is immune-deserted, linked to downregulation of NF-κB as a Pparg target. |
Transgenic mouse model (VP16;Pparg activated form), in situ histology, immunofluorescence, gene expression analysis |
Nature communications |
Medium |
34697317
|
| 2010 |
PPARγ activation promotes osteoclastogenesis through a transcriptional network comprising PPARγ, PGC-1β, and ERRα, which promotes both osteoclast differentiation and mitochondrial activation; PPARγ also suppresses osteoblastogenesis, creating dual opposing effects on bone homeostasis. |
Genetic mouse models, cell differentiation assays, gene expression analysis, reporter assays |
Trends in endocrinology and metabolism: TEM |
Medium |
20863714
|
| 2009 |
PPARγ plays a pivotal role in controlling placental vascular proliferation; PPARγ-null embryos show unsettled balance of pro- (proliferin/PLF) and anti-angiogenic factors (proliferin-related protein/PRP), and PPARγ agonist rosiglitazone treatment disrupts placental vasculature and decreases proangiogenic gene expression. |
Conditional knockout mice (Sox2Cre/PPARγL2/L2), in vivo rosiglitazone treatment, gene expression analysis |
Endocrinology |
Medium |
20810566
|
| 2022 |
PPARγ directly regulates buffalo LPIN1 transcription by binding to two PPAR response elements (PPRE1 and PPRE2) identified in the core LPIN1 promoter region (−666 to +42 bp); site mutagenesis confirmed both PPREs are required for PPARγ-dependent LPIN1 activation and triglyceride synthesis in mammary epithelial cells. |
Chromatin immunoprecipitation, promoter reporter assays, site-directed mutagenesis of PPREs, overexpression/knockdown |
Scientific reports |
Medium |
35149744
|
| 2024 |
PPARG activation promotes autophagy to accelerate ROS clearance, thereby inhibiting ROS-mediated macrophage polarization and NLRP3 inflammasome activation in rheumatoid arthritis; CBD acts as a PPARγ agonist mediating this pathway. |
In vitro RAW264.7 cell assays, CIA rat model, autophagy flux assays, ROS measurement, NLRP3 inflammasome assays |
Journal of autoimmunity |
Medium |
38648706
|