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Etude comparative de quelques propriétés physico-chimiques du système tubulaire transverse et du reticulum sarcoplasmique de deux types de fibres musculaires striées: la fibre squelettique rapide de la grenouille et la fibre myocardique ventriculaire du rat

Comparative study on physico-chemical properties of the t-system and sarcoplasmic reticulum in two types of striated muscle fibers: the fast muscle fiber of the frog and the myocardial fiber of the rat ventricle

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Summary

Rat ventricular myocardial fibers and frog toe fast skeletal fibers were examined electron microscopically after Lanthanum nitrate impregnation or after phosphotungstic acid staining.

The Lanthanum nitrate was used as an extracellular tracer. In the myocardial tissue, it is possible to observe it in all the T system ramifications, while in the skeletal fibers, the glutaraldehyde fixative elicits the sealing of most tubules and prevents Lanthanum from penetrating into their lumen. In both cases, however, the Lanthanum diffusion stops at about 50 Å from the external plasma membrane layer.

The material stained with phosphotungstic acid, probably including polysaccharides and glycoproteins, is localized at the surface of both cell types examined here, even in the 50 Å space where Lanthanum does not penetrate. In the myocardial fibers, this material is also present in the whole T system, but in the skeletal fibers, on the contrary, it is present in the intermediate and terminal parts of the L system.

The diversity in localization and nature of the polyanions present in these both types of striated muscular tissue seems to be sufficient to explain some functional properties specific of each of them.

Résumé

Des fibres myocardiques ventriculaires de Rat et des fibres squelettiques rapides des orteils de Grenouille ont été examinées en microscopic électronique après imprégnation par le nitrate de Lanthane ou après traitement par l'acide phosphotungstique.

Le nitrate de Lanthane a été utilisé comme marqueur d'espace extracellulaire. Dans le tissu myocardique, it est possible de l'observer dans toutes les ramifications du système T, alors que dans les fibres squelettiques, le glutaraldehyde du mélange fixateur provoque l'obturation de la plupart des tubules et empêche sa pénétration dans leur lumière. Dans tous les cas, cependant, la diffusion du Lanthane s'arrête à 50 Å environ du feuillet externe des membranes plasmatiques ou tubulaires.

Le matériel mis en évidence par l'acide phosphotungstique, comportant vraisemblablement des polysaccharides et des glyco-protéines, est localisé à la périphérie de toutes les cellules examinées, y compris dans l'espace de 50 À où ne pénètre pas le Lanthane. Dans les fibres myocardiques, ce matériel est présent de plus dans l'ensemble du système T, mais dans les fibres squelettiques, par contre, il est présent dans les parties intermédiaires et terminales du système L.

Il semble que la diversité de localisation et de nature des polyanions présents dans ces deux types de fibres musculaires striées puisse suffire à rendre compte d'un certain nombre de propriétés spécifiques de chacun d'eux.

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Travail réalisé dans le cadre du programme de recherches de l'équipe associée au C.N.R.S. n∘ 111.

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Pager, J. Etude comparative de quelques propriétés physico-chimiques du système tubulaire transverse et du reticulum sarcoplasmique de deux types de fibres musculaires striées: la fibre squelettique rapide de la grenouille et la fibre myocardique ventriculaire du rat. Z. Zellforsch. 119, 227–243 (1971). https://doi.org/10.1007/BF00324523

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