Sabio lab

at the CNIC

Author: Sabio lab (page 1 of 14)

Protein kinase D1 deletion in adipocytes enhances energy dissipation and protects against adiposity

Mona C. Löffler, Alexander E. Mayer, Jonathan Trujillo Viera, Angel Loza Valdes, Rabih El‐Merahbi, Carsten P. Ade, Till Karwen, Werner Schmitz, Anja Slotta, Manuela Erk, Sudha Janaki‐Raman, Nuria Matesanz, Jorge L. Torres, Miguel Marcos, Guadalupe Sabio, Martin Eilers, Almut Schulze, Grzegorz Sumara.

Nutrient overload in combination with decreased energy dissipation promotes obesity and diabetes. Obesity results in a hormonal imbalance, which among others activates G protein‐coupled receptors utilizing diacylglycerol (DAG) as secondary messenger. Protein kinase D1 (PKD1) is a DAG effector, which integrates multiple nutritional and hormonal inputs, but its physiological role in adipocytes is unknown.

Correlation between PKD1 and HOMA‐IR

Correlation between PKD1 expression and HOMA‐IR levels in human sWAT (Image: Nuria Matesanz).

Here, we show that PKD1 promotes lipogenesis and suppresses mitochondrial fragmentation, biogenesis, respiration, and energy dissipation in an AMP‐activated protein kinase (AMPK)‐dependent manner. Moreover, mice lacking PKD1 in adipocytes are resistant to diet‐induced obesity due to elevated energy expenditure. Beiging of adipocytes promotes energy expenditure and counteracts obesity. Consistently, deletion of PKD1 promotes expression of the β3‐adrenergic receptor (ADRB3) in a CCAAT/enhancer binding protein (C/EBP)‐α‐ and δ‐dependent manner, which leads to the elevated expression of beige markers in adipocytes and subcutaneous adipose tissue. Finally, deletion of PKD1 in adipocytes improves insulin sensitivity and ameliorates liver steatosis.

Our results showed that p38δ is activated in BAT by cold exposure, and lack of this kinase specifically in adipose tissue (p38δFab-KO) resulted in overweight together with reduced energy expenditure and lower body and skin surface temperature in the BAT region. These observations indicate that p38α probably blocks BAT thermogenesis through p38δ inhibition. Consistent with the results obtained in animals, p38α was reduced in visceral and subcutaneous adipose tissue of subjects with obesity and was inversely correlated with body mass index (BMI).

Thus, depletion of PKD1 in adipocytes increases energy dissipation by several complementary mechanisms and might represent an attractive strategy to treat obesity and its related complications.

El frío activa un mecanismo para adelgazar, pero también puede hacer daño al corazón

Guadalupe Sabio asegura que «uno de los problemas a los que nos enfrentamos es cómo activar la grasa parda sin producir efectos secundarios en el corazón».

[read more in El País]

Regulation of browning and BAT activation by p38 pathway (Image: Ivana Nikolić).

Organ crosstalk in energy balance and metabolic disease (8-11 April 2018)

We are organizing an EMBO Workshop to provide the most important and up-to-date research in the field of metabolism. The workshop will focus on understanding the recent progress in adipocyte biology (cell fate and browning), liver metabolism including steatosis and the role of the central nervous system in the control of the energy homeostasis. Special emphasis will be done to highlight the importance of the organ crosstalk and how signalling pathways in one tissue could affect the metabolism in other tissue.

The goals of this EMBO Workshop are to provide important new insights into the primary pathogenesis of these disorders, and especially focus on those that might lead to new therapies.

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