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Fine structural analysis of secretory silk production in the black widow spider, Latrodectus mactans

Animal Cells and Systems 1998년 2권 1호 p.145 ~ 152
문명진, Townley Mark A., Tillinghast Edward K.,
소속 상세정보
문명진 ( Moon Myung-Jin ) - Dankook University Department of Biological Sciences
 ( Townley Mark A. ) - University of New Hampshire Department of Zoology
 ( Tillinghast Edward K. ) - University of New Hampshire Department of Zoology

Abstract


The spinning apparatus and production of secretory silk from silk gland of the black widow spider, Latrodectus mactans were studied with scanning and transmission electron microscopes. The silk glands were located in seven groups on the spinnerets including each pair of major and minor ampullate, 3 pairs of tubuliform, 1 pair of flagelliform, 2 pairs of aggregate, about 50 pairs of pyriform and over 250 pairs of aciniform glands, respectively. Each group of silk gland feeds silk into one of the three spinneret pairs. Secretory silk is synthesized from rough endoplasmic reticulum (rER) of glandular epithelial cells. The secretory silk is transported from the rER into the secretory vacuoles which are grown up by fusion with the surrounding small vesicles including the secretory silk. The secretory vacuoles, which show a gradual increase in electron density with the process of maturity, are formed without involvement of the Golgi complex, suggesting that they do not play an important role in the processing of the secretory silk. The secretory silk products are released by the mechanism of apocrine secretion, losing part of their cytoplasm. Moreover, another type of silk precursor, possibly protein, appears as granular material, and is also discharged to the luminal cavity

키워드

Fine structure; Silk production; Spider; Latrodectus mactans

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