Abstract
The activation of beige fat and muscle tissues is an interesting and encouraging target for therapeutic intervention in obesity owing to their remarkable lipolytic activity and energy-consuming futile cycles. This study examined the effect of dopamine receptor D4 (DRD4) on lipid metabolisms as well as UCP1- and ATP-dependent thermogenesis in Drd4-silenced 3T3-L1 adipocytes and C2C12 muscle cells. Silencing of Drd4, followed by quantitative real-time PCR, immunoblot analysis, immunofluorescence, and staining methods, were applied to evaluate the effects of DRD4 on diverse target genes and proteins of both cells. The findings showed that DRD4 was expressed in the adipose and muscle tissues of normal and obese mice. Furthermore, the knockdown of Drd4 upregulated the expression of brown adipocyte-specific genes and proteins while downregulating lipogenesis and the adipogenesis marker proteins. Drd4 silencing also upregulated the expression of key signaling molecules involved in ATP-dependent thermogenesis in both cells. This was further elucidated by mechanistic studies showing that a Drd4 knockdown mediates UCP1-dependent thermogenesis via the cAMP/PKA/p38MAPK pathway in 3T3-L1 adipocytes and UCP1-independent thermogenesis via the cAMP/SLN/SERCA2a pathway in C2C12 muscle cells. In addition, siDrd4 also mediates myogenesis via the cAMP/PKA/ERK1/2/Cyclin D3 pathway in C2C12 muscle cells. Silencing of Drd4 promotes β3-AR-dependent browning in 3T3-L1 adipocytes and α1-AR/SERCA-based thermogenesis through an ATP-consuming futile process in C2C12 muscle cells. Understanding the novel functions of DRD4 on adipose and muscle tissues in terms of its ability to enhance energy expenditure and regulate whole-body energy metabolism will aid in developing novel obesity intervention techniques.
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All supporting data and materials are included in this manuscript.
Change history
04 May 2023
A Correction to this paper has been published: https://doi.org/10.1007/s00424-023-02819-7
Abbreviations
- ABHD5/Abhd5 :
-
Abhydrolase domain containing 5 encoding gene
- ACC:
-
Acyl-CoA carboxylase
- ACOX:
-
Acyl-coenzyme A oxidase 1
- AMPK:
-
AMP-activated protein kinase
- ATF2:
-
Activating transcription factor 2
- ATGL:
-
Adipose triglyceride lipase
- AR:
-
Adrenergic receptor
- CD36/Cd36 :
-
Cluster of differentiation 36 protein/encoding gene
- C/EBP:
-
CCAAT/enhancer-binding protein
- CKmt:
-
Mitochondrial creatine kinase
- COX-4:
-
Cyclooxygenase-4
- CPT1:
-
Carnitine palmitoyltransferase 1
- CYT-C:
-
Cytochrome C
- Ccnd3 :
-
Gene encoding G1/S-specific cyclin-D3
- CREB:
-
cAMP-response element binding protein
- CaMKII:
-
Calcium/calmodulin-dependent protein kinase II
- DR:
-
Dopamine receptor
- DRD4:
-
Dopamine receptor D4
- ERK:
-
Extracellular signal-regulated kinase
- FAS:
-
Fatty acid synthase
- HSL:
-
Hormone-sensitive lipase
- MYH/Myh :
-
Myosin heavy chain/encoding gene
- MYOD:
-
Myoblast determination protein
- MYOG/Myog :
-
Myogenin/encoding gene
- Nrf1 :
-
Nuclear respiratory factor 1 encoding gene
- PGC-1α:
-
Peroxisome proliferator-activated receptor-gamma coactivator 1α
- p38 MAPK:
-
p38 mitogen-activated protein kinase
- PKA:
-
Protein kinase A
- PPAR:
-
Peroxisome proliferator-activated receptor
- PRDM16:
-
PR domain containing 16
- RyR/Ryr :
-
Ryanodine receptor/encoding gene
- Slc27 :
-
Solute carrier family 27 encoding fatty acid transporter
- SERCA:
-
Sarco/endoplasmic reticulum Ca2+-ATPase
- UCP:
-
Uncoupling protein
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This study was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT, No. 2019R1A2C2002163).
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Kiros Haddish performed the experimental design, conducted experiments, analyzed the data, performed the statistical analysis, and wrote the manuscript; and Jong Won Yun carried out scientific support, critically reviewed the manuscript and experimental design, and approved the manuscript version to be published.
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Haddish, K., Yun, J.W. Dopamine receptor D4 (DRD4) negatively regulates UCP1- and ATP-dependent thermogenesis in 3T3-L1 adipocytes and C2C12 muscle cells. Pflugers Arch - Eur J Physiol 475, 757–773 (2023). https://doi.org/10.1007/s00424-023-02816-w
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DOI: https://doi.org/10.1007/s00424-023-02816-w