Fibre type composition of soleus and extensor digitorum longus muscles in normal female inbred Lewis rats.
Acta Histochem
; 104(4): 399-405, 2002.
Article
en En
| MEDLINE
| ID: mdl-12553710
We have analysed the fibre type composition of soleus and extensor digitorum longus (EDL) muscles of normal female 4-6-month-old inbred Lewis rats. This rat strain is used in our ongoing study of the effects of thyroid hormone on myosin heavy chain (MyHC) isoform expression. On the basis of the mATPase reaction, soleus muscles contained 96.1 +/- 2.9% of type 1 fibres supplemented by 2A fibres. EDL muscles contained type 1 (5.5 +/- 1.0%), type 2A (18.8 +/- 1.7%) and type 2B (75.7 +/- 2.2%) fibres. Immunohistochemical analysis and SDS gel electrophoresis confirmed that most fibres in the soleus muscle expressed the type 1 (slow) MyHC isoform and that only a small proportion of fibres expressed the fast 2a MyHC isoform. Immunohistochemical analysis and SDS gel electrophoresis demonstrated that almost half of the 2B fibres of EDL muscles expressed the 2x/d MyHC isoform. In both muscle types, many fibres expressed more than one MyHC isoform. The content of slow fibres in the soleus muscle of female inbred Lewis rats was slightly higher than that reported for Wistar rats, but was considerably higher than that of Sprague-Dawley rats, whereas substantial differences were not found in the proportion of slow and fast fibre types in EDL muscles in these strains.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Músculo Esquelético
/
Fibras Musculares de Contracción Lenta
/
Fibras Musculares de Contracción Rápida
Límite:
Animals
Idioma:
En
Revista:
Acta Histochem
Año:
2002
Tipo del documento:
Article
País de afiliación:
República Checa
Pais de publicación:
Alemania