Abstract：
:The bile acid receptor, TGR5, is a key regulator of glucose homeostasis, but the mechanisms by which TGR5 signaling improves glucose regulation are incompletely defined. In particular, TGR5 has an increasingly appreciated role in liver physiology and pathobiology; however, whether TGR5 signaling within the liver contributes to its glucoregulatory effects is unknown. Therefore, we investigated the role of hepatocyte TGR5 signaling on glucose regulation using a hepatocyte-specific TGR5 knockout mouse model. Hepatocyte-specific Tgr5Hep+/+ and Tgr5Hep-/- mice were fed a high fat diet (HFD) for 7 weeks and then orally gavaged with three doses of a highly potent, TGR5-specific agonist, Compound 18 (10 mg/kg), or vehicle, over 72 h and underwent an oral glucose tolerance test (OGTT) after the last dose. Herein, we report that TGR5 mRNA and protein is present in mouse hepatocytes. Cumulative food intake, body weight, and adiposity do not differ between Tgr5Hep+/+ and Tgr5Hep-/- mice with or without treatment with Compound 18. However, administration of Compound 18 improves glucose tolerance in Tgr5HEP+/+ mice, but not in Tgr5Hep-/- mice. Further, this effect occurred independent of body weight and GLP-1 secretion. Together, these data demonstrate that TGR5 is expressed in hepatocytes, where it functions as a key regulator of whole-body glucose homeostasis.
journal_name
Nutrientsjournal_title
Nutrientsauthors
Holter MM,Chirikjian MK,Briere DA,Maida A,Sloop KW,Schoonjans K,Cummings BPdoi
10.3390/nu12072124subject
Has Abstractpub_date
2020-07-17 00:00:00issue
7issn
2072-6643pii
nu12072124journal_volume
12pub_type
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