A quantitative study of growth cone filopodial extension

V. Argiro, Mary B Bunge, M. I. Johnson

Research output: Contribution to journalArticle

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Abstract

The extension of filopodia from growth cones of regenerating neurites from rat superior cervical ganglion neurons in tissue culture was studied. Cultures were grown on a thin layer of fibrous collagen and maintained in a medium containing serum and nerve growth factor. Time-lapse cinematography and computer-assisted morphometry were used to observe and measure the kinetics of extension of individual filopodia. Filopodia extended from the growth cone margin, trailing neurite, or from each other. Frequently, extension was preceded by the appearance at the cone margin of a nodule of cytoplasm which appeared dense in phase-contrast optics. Branch points between adjacent extending filopodia remained fixed with respect to the growth cone while the filopodia lengthened. The rate of extension was maximum just after initiation (0.12 ± 0.4 μm/sec; mean ± SD; n = 36) and declined thereafter until the filopodium collapsed. This initial rate of extension was directly correlated with the eventual length of the filopodium (r = 0.67). Filopodia of growth cones arising from embryonic neurons exhibited higher initial extension rates (range: 0.07 to 0.20 μm/sec; mean = 0.13 μm/sec) than those of postnatal neurons (range: 0.01 to 0.13 μm/sec; mean = 0.09 μm/sec). These data are discussed in relation to a model proposed by Tilney and Inoue for the extension, by distal addition of G-actin to growing filaments, of another type of elongating process filled with microfilaments, the acrosomal process of Thyone sperm.

Original languageEnglish
Pages (from-to)149-162
Number of pages14
JournalJournal of Neuroscience Research
Volume13
Issue number1-2
StatePublished - Jan 1 1985
Externally publishedYes

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Growth Cones
Pseudopodia
Neurites
Neurons
Cineradiography
Superior Cervical Ganglion
Nerve Growth Factor
Actin Cytoskeleton
Spermatozoa
Actins
Cytoplasm
Collagen
Serum

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Argiro, V., Bunge, M. B., & Johnson, M. I. (1985). A quantitative study of growth cone filopodial extension. Journal of Neuroscience Research, 13(1-2), 149-162.

A quantitative study of growth cone filopodial extension. / Argiro, V.; Bunge, Mary B; Johnson, M. I.

In: Journal of Neuroscience Research, Vol. 13, No. 1-2, 01.01.1985, p. 149-162.

Research output: Contribution to journalArticle

Argiro, V, Bunge, MB & Johnson, MI 1985, 'A quantitative study of growth cone filopodial extension', Journal of Neuroscience Research, vol. 13, no. 1-2, pp. 149-162.
Argiro V, Bunge MB, Johnson MI. A quantitative study of growth cone filopodial extension. Journal of Neuroscience Research. 1985 Jan 1;13(1-2):149-162.
Argiro, V. ; Bunge, Mary B ; Johnson, M. I. / A quantitative study of growth cone filopodial extension. In: Journal of Neuroscience Research. 1985 ; Vol. 13, No. 1-2. pp. 149-162.
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