Abstract
The extracellular matrix is a master regulator of tissue homeostasis in health and disease. Here we examined how the small, leucine-rich, extracellular matrix proteoglycan decorin regulates cardiomyocyte metabolism during fasting in vivo First, we validated in Dcn-/- mice that decorin plays an essential role in autophagy induced by fasting. High-throughput metabolomics analyses of cardiac tissue in Dcn-/- mice subjected to fasting revealed striking differences in the hexosamine biosynthetic pathway resulting in aberrant cardiac O-β-N-acetylglycosylation as compared with WT mice. Functionally, Dcn-/- mice maintained cardiac function at a level comparable with nonfasted animals whereas fasted WT mice showed reduced ejection fraction. Collectively, our results suggest that reduced sensing of nutrient deprivation in the absence of decorin preempts functional adjustments of cardiac output associated with metabolic reprogramming.
Highlights
The extracellular matrix is a master regulator of tissue homeostasis in health and disease
Because our previous work demonstrated the necessity of decorin expression for cardiac autophagy in response to 25-h nutrient deprivation [11] (Fig. S1), we investigated the possibility that prolonged fasting (48 h) could overcome this autophagic impairment in DcnϪ/Ϫ mice
In WT mice, we found that a 48-h fasting resulted in robust conversion of cardiac LC3-I to LC3-II, indicating enhanced autophagic activity, whereas, under the same conditions of nutrient deprivation, LC3-II levels were unchanged in the DcnϪ/Ϫ hearts (Fig. 1A)
Summary
Because our previous work demonstrated the necessity of decorin expression for cardiac autophagy in response to 25-h nutrient deprivation [11] (Fig. S1), we investigated the possibility that prolonged fasting (48 h) could overcome this autophagic impairment in DcnϪ/Ϫ mice. We evaluated expression of the lipidated version of microtubule-asso-
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