Ultrastructure and localization of calcium in uterine smooth muscle

G. Rubanyi, I. Balogh, A. G.B. Kovach, E. Somogyi, P. Sótonyi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

General ultrastructure and subcellular calcium localization was studied in the longitudinal muscle layer of the rabbit's post partum myometrium by means of the lead acetate and potassium pyroantimonate cytochemical techniques. The finding of abundant surface vesicles (SV) and intracellular tubules of smooth endoplasmic reticulum (SER), their close contacts in some parts of the fibre, and the isolated compartment between plasma membrane (PM) and basal membrane (BM) may be important in the understanding of characteristic features of excitation-contraction coupling in this tissue. In the resting fibre (Mn2+-induced relaxation) the acetate and pyroantimonate reaction product was localized in the PM, SV, SER and mitochondria (M), indicating the possible in situ Ca-sequestering properties of the above structures. Tissues fixed at the peak of K+-contraction revealed abundant precipitates in the cytoplasm, while little reaction product was seen at the periphery of the fibre.

Original languageEnglish
Pages (from-to)269-279
Number of pages11
JournalActa morphologica Academiae Scientiarum Hungaricae
Volume28
Issue number3
Publication statusPublished - Dec 1 1980

ASJC Scopus subject areas

  • Anatomy

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