Smad3 Mediates Diabetic Dyslipidemia and Fatty Liver in db/db Mice by Targeting PPARδ.
Int J Mol Sci
; 24(14)2023 Jul 13.
Article
in En
| MEDLINE
| ID: mdl-37511155
ABSTRACT
Transforming growth factor-ß (TGF-ß)/Smad3 signaling has been shown to play important roles in fibrotic and inflammatory diseases. However, the role of Smad3 in dyslipidemia and non-alcoholic fatty liver disease (NAFLD) in type 2 diabetes remains unclear, and whether targeting Smad3 has a therapeutic effect on these metabolic abnormalities remains unexplored. These topics were investigated in this study in Smad3 knockout (KO)-db/db mice and by treating db/db mice with a Smad3-specific inhibitor SIS3. Compared to Smad3 wild-type (WT)-db/db mice, Smad3 KO-db/db mice were protected against dyslipidemia and NAFLD. Similarly, treatment of db/db mice with SIS3 at week 4 before the onset of type 2 diabetes until week 12 was capable of lowering blood glucose levels and improving diabetic dyslipidemia and NAFLD. In addition, using RNA-sequencing, the potential Smad3-target genes related to lipid metabolism was identified in the liver tissues of Smad3 KO/WT mice, and the regulatory mechanisms were investigated. Mechanistically, we uncovered that Smad3 targeted peroxisome proliferator-activated receptor delta (PPARδ) to induce dyslipidemia and NAFLD in db/db mice, which was improved by genetically deleting and pharmacologically inhibiting Smad3.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
PPAR delta
/
Diabetes Mellitus, Type 2
/
Smad3 Protein
/
Non-alcoholic Fatty Liver Disease
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
Int J Mol Sci
Year:
2023
Type:
Article
Affiliation country:
China