Presence of cardiac α-myosin correlates with histochemical myosin Ca2+ ATPase activity in rabbit masseter muscle

A combined enzyme-histochemical (ATPase reactivity) and immunohistochemical study has been performed on sections of rabbit masseter muscle. The majority of the fibres previously designated as type IIC and/or type I according to their ATPase activity were found to contain 'cardiac' alpha-my...

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Bibliographic Details
Published in:Histochemical journal 1992-05, Vol.24 (5), p.260-265
Main Authors: BREDMAN, J. J, WEIJS, W. A, MOORMAN, A. F. M
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Calcium-Transporting ATPases - immunology
Calcium-Transporting ATPases - metabolism
Cross Reactions
Female
Fetus - metabolism
Fundamental and applied biological sciences. Psychology
Hydrogen-Ion Concentration
Immunohistochemistry
Masseter Muscle - enzymology
Masseter Muscle - metabolism
Myocardium - enzymology
Myocardium - metabolism
Myocardium - ultrastructure
Myosins - immunology
Myosins - metabolism
Pregnancy
Rabbits
Striated muscle. Tendons
Vertebrates: osteoarticular system, musculoskeletal system
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Summary:A combined enzyme-histochemical (ATPase reactivity) and immunohistochemical study has been performed on sections of rabbit masseter muscle. The majority of the fibres previously designated as type IIC and/or type I according to their ATPase activity were found to contain 'cardiac' alpha-myosin heavy chain in addition to other myosin heavy chains. All alpha-myosin heavy chain-containing fibres reveal ATPase activity after pre-incubation at pH 4.2-4.6 similar to that of the classical type I fibres, while, in that pH range, limb type IIC fibres show intermediate ATPase activity. One group of these fibres reveal ATPase activity after pre-incubation at pH 10.1-10.3 as well, but not at pH 10.4-10.5. These fibres contain exclusively either alpha- or alpha- and I-myosin heavy chains but do not contain the IIA-myosin heavy chain. The second part of the fibres reveals ATPase activity after treatment within the whole alkaline pre-incubation range (pH 10.1-10.5) and these fibres contain alpha-myosin and IIA-myosin but no I-myosin heavy chain. It is concluded that the classical IIC fibre type is not present in the rabbit masseter muscle. Furthermore, ATPase reactivity does not allow us to distinguish fibres on their myosin heavy chain content in rabbit masseter muscle.
ISSN:0018-2214
1573-6865
DOI:10.1007/BF01046840