Alcohol Affects the Skeletal Muscle Proteins, Titin and Nebulin in Male and Female Rats
| Autor: | Christopher Martin, Wolfgang A. Linke, Kai O. Lindros, Harri A. Järveläinen, Ross J. Hunter, Ciprian Neagoe, Victor R. Preedy |
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| Rok vydání: | 2003 |
| Předmět: |
Male
medicine.medical_specialty Muscle Proteins Medicine (miscellaneous) chemistry.chemical_compound Nebulin Gastrocnemius muscle Sex Factors Atrophy Internal medicine Myosin medicine Animals Connectin Rats Wistar Muscle Skeletal Myopathy Nutrition and Dietetics Ethanol biology Skeletal muscle musculoskeletal system medicine.disease Rats medicine.anatomical_structure Endocrinology chemistry Biochemistry biology.protein Electrophoresis Polyacrylamide Gel Female Titin medicine.symptom Protein Kinases |
| Zdroj: | The Journal of Nutrition. 133:1154-1157 |
| ISSN: | 0022-3166 |
| DOI: | 10.1093/jn/133.4.1154 |
| Popis: | Alcoholic myopathy is characterized by decreased protein synthesis and contents resulting in atrophy of muscle fibers. We investigated the effect of alcohol on the cytoskeletal muscle proteins, nebulin and titin. Because women are more susceptible than men to the toxic effects of alcohol, male and female rats were included. Four groups were investigated: alcoholic males, pair-fed males, alcoholic females, pair-fed females. Alcohol consumption per unit body weight was 12.9 g/kg.d, with no difference between males and females. After 10 wk, male and female rats fed alcohol had lower gastrocnemius and plantaris protein and RNA contents (P < 0.001), with no effect on soleus, indicating myopathy of type II fibers. The gastrocnemius was fractionated to measure myofibrillary protein contents. Low percentage SDS-gel electrophoresis was performed to determine myosin heavy chain (MHC), nebulin and titin contents. Alcohol reduced gastrocnemius myofibrillary protein and MHC contents, and the plantaris RNA/protein ratio (P < 0.01). The titin/MHC and nebulin/MHC ratios were unaffected, suggesting a concomitant reduction in titin and nebulin. The decreases in titin and nebulin contents may affect muscle function. An interaction between gender and alcohol was noted for the plantaris RNA/protein ratio (P < 0.025), suggesting a reduced capacity for muscle protein synthesis in females. |
| Databáze: | OpenAIRE |
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