培養星状膠細胞に関する知見補遺:「扁平星状膠細胞」および Pinocytosis

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  • Some Observations on the Astrocytes Cultured in Vitro: ‘Flattened Astrocyte’ and Pinocytosis
  • バイヨウ ホシジョウコウサイボウ ニ カンスル チケン ホイ ヘンペイ ホシジョウコウサイボウ オヨビ Pinocytosis エイブン

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In the course of study on the dynamic morphology of astrocytes grown in vitro, special attention was paid to the acclimatizing features of processes of astrocytes, to the astrocytes with highly flattened cytoplasm and to the pinocytotic process of unusually large droplets observed in these astrocytes.<br>In the series of mulifarious features observed in the processes of cultured astrocytes, there can be recognized two morphological ‘extremes’; 1. a wide, thin, membrane-like ‘flattened process’, and 2. a fibrous, slender, wire-like ‘condensed process’. Both seem to be highly acclimatized expressions of usual protoplasmic processes to enviromental conditions.<br>The acclimatizing astrocytes with highly flattened processes were named ‘flattened astrocytes’.<br>In the flattened astrocyte, pinocytic granules of unusual size (5-10μ) are occasionally found. These large granules are contacted by several minute phase-dense granules (0.3-1.5μ) with acid phosphatase activity. They may possibly correspond to the microkinetoshere (ROSE 1957a, b) or the lysosome (de DUVE et al. 1955).<br>As a result of interplay between a large pinocytic granule and the minute phasedense granules, there is produced a medium-sized phase-dense granule (2.0-3.5μ). The possible relation of the medium-sized granules to the segresome (TANAKA 1960) or the cytolysome (NOVIKOFF 1959) was discussed.<br>From the information at hand, the pinocytosis in cultured astrocytes per se can not be considered a degenerative process, although it is not an indispensable activity of the cell.

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