Lack of ?acid reversal? of myofibrillar adenosine triphosphatase in masticatory muscle fibres of rhesus monkeys

Maxwell, L. C.; Carlson, David S.; Brangwyn, Carole

doi:10.1007/bf01024551

Cited by 19 publications

(6 citation statements)

References 19 publications

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“…Histochemical demonstration of myofibrillar ATPase activity of masticatory muscle fibers does not exactly fit the pattern normally seen for three types of muscle fibers in limb muscles (Maxwell e t al., 1980a). Specifically, when incubated without prior treatment, some of the fibers in masticatory muscles demonstrate an activity relatively greater than usually seen for Type I fibers, but less than for (Ringqvist, 1973(Ringqvist, , 1974(Ringqvist, , 1977Kugelberg, 1976; Maxwell et al, 1980b). According to this hypothesis greater proportions of "intermediate" fibers might be expected following alterations of muscle function which result in significant differences in the proportion of Type I and Type I1 fibers.…”

Section: Discussionmentioning

confidence: 95%

“…This correlation of physiological and histochemical characteristics has not yet been performed for fibers of the masticatory muscles of rhesus monkeys. Furthermore, histochemical reactions for myofibrillar ATPase, particularly following acid preincubation, differ for masticatory compared to limb muscles of monkeys (Maxwell et al, 1980b). Due to these limita-tions, we classified masticatory muscle fibers only as Type I or Type I1 (Fig.…”

Section: Surgical Proceduresmentioning

confidence: 99%

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Adaptation of the masseter and temporalis muscles following alteration in length, with or without surgical detachment

et al. 1981

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Histochemical properties, muscle fiber cross-sectional area, muscle fiber length, and the oxidative capacity of masticatory muscles of female rhesus monkeys were assessed following alteration in functional length by an intraoral appliance or by detachment of the muscle. Experimental groups received the appliance only (A); the appliance and subsequent detachment of the masseter (AD); the appliance and detached masseter, but with surgical reattachment of the masseter to the pterygomasseteric sling (ADR); no appliance, but detachment and reattachment of masseter (DR); or an appliance which was removed after 24 weeks to study posttreatment responses (PT). Animals were sacrificed and the muscles were studied at intervals from 4 to 48 weeks after initiation of the experimental period. The results of these studies led to the following conclusions: (1) Stretching the masseter and temporalis muscles within physiological limits did not significantly alter the proportion of fiber types, although oxidative capacity of the fibers was reduced. (2) Fibers with "intermediate" myofibrillar ATPase activity were no more prevalent in experimental than control muscles. (3) The cross-sectional area of Type I fibers of masseter muscles decreased following some experimental procedures, indicating that recruitment of these fibers is the most sensitive to altered jaw function. (4) Minimal alteration of muscle capillarity was induced by any of the experimental procedures. (5) The lengths of masseter muscle fibers in Group PT and of temporalis muscle fibers in groups AD and ADR were greater than in control animals.

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Section: Discussionmentioning

confidence: 95%

Section: Surgical Proceduresmentioning

confidence: 99%

Adaptation of the masseter and temporalis muscles following alteration in length, with or without surgical detachment

et al. 1981

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“…Presumably, these correspond to IIC, or "transitional" fibers which contain both slow-and fasttwitch myosin ATPases and are in transition from fast-to slow-twitch or vice versa. Lack of "acid reversal" has been documented in other growing mammals (Rowlerson, 1990), e.g., macaques (Maxwell et al, 1980) and pigs (Suzuki and Cassens, 1980). Whether any S/F fibers can be assigned to IM or IIM classes was not ascertained in this study.…”

Section: Muscle Histochemistrymentioning

confidence: 90%

Ontogeny of histochemical fiber types and muscle function in the masseter muscle of miniature swine

Anapol

Herring

2000

Am. J. Phys. Anthropol.

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In this study of masticatory maturation, the ontogeny of the histochemical fiber type composition of musculus masseter is examined in the omnivorous miniature swine (Sus scrofa). Fiber type characteristics are interpreted by comparison with electromyography (EMG) recorded during feeding behavior. Similar to locomotion studies, the results suggest a correspondence between the composition and arrangement of motor units and their recruitment pattern. Serial sections of masseter muscles from 10 minipigs, ranging from 2 weeks to slightly over 1 year of age, were stained for myosin adenosine triphosphatase (mATPase) activity to distinguish slow-twitch from fast-twitch fibers, and for nicotinamide adenosine dehydrogenase-tetrazolium reductase to assess the aerobic capacity of the same fibers. Although maintaining a uniformly high aerobic capacity throughout ontogeny and in adult animals, a transition is observed in the relative proportions of fast- and slow-twitch fibers. The primarily fast-twitch neonatal pig masseter eventually comprises approximately 25-30% slow-twitch fibers in adults, with a higher predominance of slow fibers in the deep (vs. superficial) and anterior (vs. posterior) regions of the muscle. Furthermore, while individual fibers of adult masseters generally stain for either alkaline- or acid-stable mATPase activity, a substantial proportion of cells in developing animals exhibits the presence of both isozymes. EMG results indicate functional heterogeneity within the masseter of adult pigs. During chewing, when pig chow is replaced by cracked corn, EMG activity in the deep portion of the muscle either decreases or increases slightly. In the superficial portion, however, muscle amplitudes become dramatically higher for corn, surpassing levels generated for chewing the less obdurate chow. These results are consistent with a behavioral transition from neonatal suckling to sustained mastication of foods of more complex textures eaten by adult pigs. The relationship between these fiber type and EMG results for pig masseter corresponds to those pertaining to motor unit recruitment in the extensor muscles of locomotion. Implications of this work for the evolutionary morphology of mastication also are discussed.

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“…This procedure enables, after acid and alkalic preincubation followed by a routine ATPase incubation, separation of the fiber population into major fiber types (type I and type 11) and subtypes (type I1 : A and type I1 : B) (3)(4)(5)(6). Furthermore, transitional fiber types such as type I1 : C fibers, showing intermediate staining modalities between these major fiber types, can be detected (7,8). The validity of the fiber type concept can be increased by combining ATPase and metabolic-based systems.…”

mentioning

confidence: 98%

Fiber types and diameters in the porcine masseter muscle: A histochemical study

Ström

Clemensson²,

Holm³

1994

Acta Odontologica Scandinavica

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Type I, I:B, II:A, and II:C fibers were identified by adenosine triphosphatase histochemistry in masseter muscles from 22 female pigs (1 year old, 70-90 kg body weight). Type II:B fibers were not found. This was in contrast to the findings of five fiber types in the porcine soleus muscles. In the porcine masseter the most prominent fiber type was II:A (75%). Type I fibers constituted 15% of the fiber types on average. Type I:B and II:C fibers were less frequent (4-6%). No significant difference was found between various biopsy locations, but there was a tendency towards more type I fibers in the deeper part of the masseter muscle. The mean fiber diameters were larger in the masseter muscles than in the soleus; however, the differences were significant only for fiber type I:B.

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Lack of ?acid reversal? of myofibrillar adenosine triphosphatase in masticatory muscle fibres of rhesus monkeys

Cited by 19 publications

References 19 publications

Adaptation of the masseter and temporalis muscles following alteration in length, with or without surgical detachment

Adaptation of the masseter and temporalis muscles following alteration in length, with or without surgical detachment

Ontogeny of histochemical fiber types and muscle function in the masseter muscle of miniature swine

Fiber types and diameters in the porcine masseter muscle: A histochemical study

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