The relationship between stress fiber-like structures and nascent myofibrils in cultured cardiac myocytes

A. A. Dlugosz, Parker B Antin, V. T. Nachmias, H. Holtzer

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Abstract

The topographic relationship between stress fiber-like structures (SFLS) and nascent myofibrils was examined in cultured chick cardiac myocytes by immunofluorescence microscopy. Antibodies against muscle-specific light meromyosin (anti-LMM) and desmin were used to distinguish cardiac myocytes from fibroblastic cells. By various combinations of staining with rhodamine-labeled phalloidin, anti-LMM, and antibodies against chick brain myosin and smooth muscle α-actinin, we observed the following relationships between transitory SFLS and nascent and mature myofibrils: (a) a more SFLS were present im immature than mature myocytes; (b) in immature myocytes a single fluorescent fiber would stain as a SFLS distally and as a striated myofibril proximally, towards the center of the cell; (c) in regions of a myocyte not yet penetrated by the elongating myofibrils, SFLS were abundant; and (d) in regions of a myocyte with numerous mature myofibrils, SFLS had totally disappeared. Spontaneously contracting striated myofibrils with definitive Z-band regions were present long before antidesmin localized in the I-Z-band region and long before morphologically recognizable structures periodically link Z-bands to the sarcolemma. These results suggest a transient one-on-one relationship between individual SFLS and newly emerging individual nascent myofibrils. Based on these and other relevant data, a complex, multistage molecular model is presented for myofibrillar assembly and maturation. Lastly, it is of considerable theoretical interest to note that mature cardiac myocytes, like mature skeletal myotubes, lack readily detectable stress fibers.

Original languageEnglish (US)
Pages (from-to)2268-2278
Number of pages11
JournalJournal of Cell Biology
Volume99
Issue number6
StatePublished - 1984
Externally publishedYes

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Stress Fibers
Myofibrils
Cardiac Myocytes
Muscle Cells
Myosin Subfragments
Smooth Muscle Myosins
Actinin
Muscles
Sarcolemma
Molecular Models
Desmin
Antibodies
Skeletal Muscle Fibers
Fluorescence Microscopy
Coloring Agents
Staining and Labeling
Brain

ASJC Scopus subject areas

  • Cell Biology

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The relationship between stress fiber-like structures and nascent myofibrils in cultured cardiac myocytes. / Dlugosz, A. A.; Antin, Parker B; Nachmias, V. T.; Holtzer, H.

In: Journal of Cell Biology, Vol. 99, No. 6, 1984, p. 2268-2278.

Research output: Contribution to journalArticle

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