title: Reduction of TIP47 improves hepatic steatosis and glucose homeostasis in mice.
abstract: Lipid droplets in the liver are coated with the perilipin family of proteins, notably adipocyte differentiation-related protein (ADRP) and tail-interacting protein of 47 kDa (TIP47). ADRP is increased in hepatic steatosis and is associated with hyperlipidemia, insulin resistance, and glucose intolerance. We have shown that reducing ADRP in the liver via antisense oligonucleotide (ASO) treatment attenuates steatosis and improves insulin sensitivity and glucose tolerance. We hypothesized that TIP47 has similar effects on hepatic lipid and glucose metabolism. We found that TIP47 mRNA and protein levels were increased in response to a high-fat diet (HFD) in C57BL/6J mice. TIP47 ASO treatment decreased liver TIP47 mRNA and protein levels without altering ADRP levels. Low-dose TIP47 ASO (15 mg/kg) and high-dose TIP47 ASO (50 mg/kg) decreased triglyceride content in the liver by 35% and 52%, respectively. Liver histology showed a drastic reduction in hepatic steatosis following TIP47 ASO treatment. The high dose of TIP47 ASO significantly blunted hepatic triglyceride secretion, improved glucose tolerance, and increased insulin sensitivity in liver, adipose tissue, and muscle. These findings show that TIP47 affects hepatic lipid and glucose metabolism and may be a target for the treatment of nonalcoholic fatty liver and related metabolic disorders.
authors.affiliation: University of Pennsylvania, Perelman School of Medicine, Department of Medicine, Gastroenterology Division, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Rotonya M
authors.initials: RM
authors.lastname: Carr
authors.forename: Rajesh T
authors.initials: RT
authors.lastname: Patel
authors.forename: Vandana
authors.initials: V
authors.lastname: Rao
authors.forename: Ravindra
authors.initials: R
authors.lastname: Dhir
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Graham
authors.forename: Rosanne M
authors.initials: RM
authors.lastname: Crooke
authors.forename: Rexford S
authors.initials: RS
authors.lastname: Ahima
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism / Q000473:pathology; D000818:Animals; D001786:Blood Glucose / Q000378:metabolism*; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D059305:Diet, High-Fat; D005234:Fatty Liver / Q000378:metabolism* / Q000473:pathology / Q000628:therapy; D007328:Insulin / Q000378:metabolism; D007333:Insulin Resistance / Q000502:physiology; D008099:Liver / Q000187:drug effects / Q000378:metabolism* / Q000473:pathology; D051379:Mice; D016376:Oligonucleotides, Antisense / Q000494:pharmacology / Q000627:therapeutic use; D000070796:Perilipin-3; D014280:Triglycerides / Q000378:metabolism
chemical_list: D001786:Blood Glucose; D002352:Carrier Proteins; D007328:Insulin; D016376:Oligonucleotides, Antisense; D000070796:Perilipin-3; C523440:Plin3 protein, mouse; D014280:Triglycerides