Changes in Membrane Ceramide Pools in Rat Soleus Muscle in Response to Short-Term Disuse
| Autor: | Maria N. Shalagina, Guzalia F. Zakirjanova, Alexey V. Sekunov, Sergey Ovechkin, Irina G. Bryndina, Valeriy G. Sergeev, Andrey L. Zefirov, Natalia G. Ovchinina, Vladimir Protopopov, Alexey M. Petrov |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Ceramide
membrane lipid asymmetry Sarcoplasm Fluorescent Antibody Technique Ceramides Article Catalysis lcsh:Chemistry Inorganic Chemistry chemistry.chemical_compound Membrane Microdomains medicine Animals ceramide skeletal muscle Physical and Theoretical Chemistry Muscle Skeletal lcsh:QH301-705.5 sphingomyelinase Molecular Biology Lipid raft Spectroscopy lipid rafts Soleus muscle Sarcolemma neuromuscular junction Cell Membrane Organic Chemistry Skeletal muscle General Medicine Muscle atrophy Rats Computer Science Applications Cell biology TNFR1 carbohydrates (lipids) Sphingomyelin Phosphodiesterase medicine.anatomical_structure lcsh:Biology (General) lcsh:QD1-999 chemistry lipids (amino acids peptides and proteins) disuse medicine.symptom Sphingomyelin Biomarkers |
| Zdroj: | International Journal of Molecular Sciences Volume 20 Issue 19 International Journal of Molecular Sciences, Vol 20, Iss 19, p 4860 (2019) |
| ISSN: | 1422-0067 |
| DOI: | 10.3390/ijms20194860 |
| Popis: | Lipid raft disruption is an early event during skeletal muscle unloading. Ceramide (Cer) serves as a signaling lipid that can contribute to lipid raft disturbance and muscle atrophy. Using biochemical and fluorescent approaches, the distribution of Cer and related molecules in the rat soleus muscle subjected to 12 h of hindlimb suspension (HS) was studied. HS led to upregulation of TNF&alpha receptor 1 (TNFR1), Cer-producing enzymes, and acid and neutral sphingomyelinase (SMase) in detergent-resistant membranes (lipid rafts), which was accompanied by an increase in Cer and a decrease in sphingomyelin in this membrane fraction. Fluorescent labeling indicated increased Cer in the sarcoplasm as well as the junctional (synaptic) and extrajunctional compartments of the suspended muscles. Also, a loss of membrane asymmetry (a hallmark of membrane disturbance) was induced by HS. Pretreatment with clomipramine, a functional inhibitor of acid SMase, counteracted HS-mediated changes in the Cer/sphingomyelin ratio and acid SMase abundance as well as suppressed Cer accumulation in the intracellular membranes of junctional and extrajunctional regions. However, the elevation of plasma membrane Cer and disturbance of the membrane asymmetry were suppressed only in the junctional compartment. We suggest that acute HS leads to TNFR1 and SMase upregulation in the lipid raft fraction and deposition of Cer throughout the sarcolemma and intracellularly. Clomipramine-mediated downregulation of acid SMase can suppress Cer accumulation in all compartments, excluding the extrajunctional plasma membrane. |
| Databáze: | OpenAIRE |
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