Expression of multiple tau isoforms and microtubule bundle formation in fibroblasts transfected with a single tau cDNA

Y. Kanai, R. Takemura, T. Oshima, H. Mori, Y. Ihara, Masashi Yanagisawa, T. Masaki, N. Hirokawa

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Abstract

Tau proteins are a class of low molecular mass microtubule-associated proteins that are specifically expressed in the nervous system. A cDNA clone of adult rat tau was isolated and sequenced. To analyze functions of tau proteins in vivo, we carried out transfection experiments. A fibroblast cell line, which was transfected with the cDNA, expressed three bands of tau, while six bands were expressed in rat brain. After dephosphorylation, one of the three bands disappeared, demonstrating directly that phosphorylation was involved in the multiplicity of tau. Morphologically, we observed a thick bundle formation of microtubules in the transiently and stably tau-gene-transfected cells. In addition, we found that the production of tubulin was prominently enhanced in the stably transfected cells. Thus, we suppose that tau proteins promote polymerization of tubulin, form bundles of microtubules in vivo, and play important roles in growing and maintaining nerve cell processes.

Original languageEnglish (US)
Pages (from-to)1173-1184
Number of pages12
JournalJournal of Cell Biology
Volume109
Issue number3
StatePublished - 1989

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tau Proteins
Microtubules
Protein Isoforms
Complementary DNA
Fibroblasts
Tubulin
Microtubule-Associated Proteins
Polymerization
Nervous System
Transfection
Clone Cells
Phosphorylation
Neurons
Cell Line
Brain
Genes

ASJC Scopus subject areas

  • Cell Biology

Cite this

Kanai, Y., Takemura, R., Oshima, T., Mori, H., Ihara, Y., Yanagisawa, M., ... Hirokawa, N. (1989). Expression of multiple tau isoforms and microtubule bundle formation in fibroblasts transfected with a single tau cDNA. Journal of Cell Biology, 109(3), 1173-1184.

Expression of multiple tau isoforms and microtubule bundle formation in fibroblasts transfected with a single tau cDNA. / Kanai, Y.; Takemura, R.; Oshima, T.; Mori, H.; Ihara, Y.; Yanagisawa, Masashi; Masaki, T.; Hirokawa, N.

In: Journal of Cell Biology, Vol. 109, No. 3, 1989, p. 1173-1184.

Research output: Contribution to journalArticle

Kanai, Y, Takemura, R, Oshima, T, Mori, H, Ihara, Y, Yanagisawa, M, Masaki, T & Hirokawa, N 1989, 'Expression of multiple tau isoforms and microtubule bundle formation in fibroblasts transfected with a single tau cDNA', Journal of Cell Biology, vol. 109, no. 3, pp. 1173-1184.
Kanai, Y. ; Takemura, R. ; Oshima, T. ; Mori, H. ; Ihara, Y. ; Yanagisawa, Masashi ; Masaki, T. ; Hirokawa, N. / Expression of multiple tau isoforms and microtubule bundle formation in fibroblasts transfected with a single tau cDNA. In: Journal of Cell Biology. 1989 ; Vol. 109, No. 3. pp. 1173-1184.
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