ArticlebioRxiv : the preprint server for biology2025
STX4 is indispensable for mitochondrial homeostasis in skeletal muscle.
Article in bioRxiv : the preprint server for biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Mitochondrial homeostasis is vital for optimal skeletal muscle integrity. Mitochondrial quality control (MQC) mechanisms that are essential for maintaining proper functions of mitochondria include mitochondrial biogenesis, dynamics and mitophagy. Previously, Syntaxin 4 (STX4) traditionally considered a cell surface protein known for glucose uptake in skeletal muscle, was also identified at the outer mitochondrial membrane. STX4 enrichment was sufficient to reverse Type 2 diabetes-associated mitochondrial damage in skeletal muscle by inactivation of mitochondrial fission. However, whether STX4 could modulate skeletal muscle mitochondrial homeostasis through MQC mechanisms involving mitochondrial biogenesis or mitophagy remains to be determined. Methods: To determine the requirements of STX4 in mitochondrial structure, function and MQC processes of biogenesis and mitophagy, we implemented our in-house generated inducible skeletal muscle-specific STX4-knockout (skmSTX4-iKO) mice ( Results: We found that non-obese skmSTX4-iKO male mice (>50% reduced STX4 abundance, Soleus and Gastrocnemius ***p<0.001, Tibialis anterior (TA) ****p<0.0001) developed insulin resistance (**p<0.01), together with reduced energy expenditure (AUC *p<0.05), respiratory exchange ratio (AUC **p<0.01), and grip strength (*p<0.05). STX4 ablation in muscle also impaired mitochondrial oxygen consumption rate (****p<0.0001). Mitochondrial morphological damage was heterogenous in STX4 depleted muscle, presenting with small fragmented mitochondria (****p<0.0001) and deceased electron transport chain (ETC) abundance (CI ***p<0.001, CII *p<0.05, CIV **p<0.01) in oxidative soleus muscle, while glycolytic TA fibers display enlarged swollen mitochondria (****p<0.0001) with no change in ETC abundance. Notably, >60% reduction of STX4 in siSTX4 L6.GLUT4myc myotubes (****p<0.0001) also decreased ETC abundance (CI ****p<0.0001, CII ****p<0.0001, CIV *p<0.05) without changes in mitochondrial glucose metabolism, as shown by [U- Conclusions: Our study demonstrated STX4 as a key mitochondrial regulator required for mitochondrial homeostasis in skeletal muscle.
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