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Journal of Cell Science, Vol 91, 563-570, Copyright © 1988 by Company of Biologists

Submitted on June 29, 1988
Accepted on August 11, 1988

Microtubule and microfilament distribution during the secretory activity of an insect gland

R. DALLAI 1, D. MARCHINI 1, and G. CALLAINI 1

1 Dipartimento di Biologia Evolutiva, Universit` di Siena, Via P.A. Mattioli 4, 53100, Siena, Italy

Author for correspondence

The distribution of microfilaments and microtubules was studied in the secretory cells of the accessory glands of the medfly (Ceratitis capitata) female reproductive system. Actin, demonstrated by rhodamine-phalloidin and heavy meromyosin decoration, is present around the extracellular storage cavity at the level of microvilli and the subapical cytoplasm of the cell. The size of such a cavity varies in relation to the secretory cycle of the cells and also the distribution of microfilaments. In the early stage of activity microtubules detected using an antibody against {alpha}-tubulin are distributed at the periphery of the cell and around the extracellular cavity. During secretion they occupy the whole of the cytoplasm and disappear at the end of the secretory cycle. The mechanism of the discharge of the secretion from the extracellular cavity is discussed.

Key words: cytoskeleton, cell secretion, insect ectodermal glands

Submitted on June 29, 1988
Accepted on August 11, 1988




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© The Company of Biologists Ltd 1988