Various types of the pituitary folliculo-stellate cells involving the Siperstein's corticotroph in the normal rats.
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概要
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The differentiation of the folliculo-stellate (F-S) cells was electronmicroscopically investigated in the normal male adult rats from the Wistar, Wistar-Imamichi, Holzmann, Spraque-Dowley and Donryu strains. The F-S cells may be divided into the five types according to the granulation. Each type is, however, provided with the common characteristic features, i. e., the stellate shape due to projecting the cytoplasmic processes and a tendency to embrace an acidophil. The first type is an agranular independent or anastomosing immature cell. It is different in shape and arrangement from the follicular cell, but similar in agranularity and immaturity to it. The second is a slightly differentiated cell, in which scanty small secretory granules 50-100nm in diameter begin to appear near the plasma membrane. The third is a moderately differentiated cell providing the regularly row arrangement of secretory granules 100-200nm in diameter along the plasma membrane, corresponding, in fine structure, with a corticotroph. The fourth is a fully differentiated cell with heavy granulation, whose secretory granules 150-250nm in diameter are accumulated in the whole cytoplasm, suggesting the storing type. It is difficult to determine whether the fourth type coincides with a hypergranulated corticotroph or a stellate thyrotroph. The fifth is a kind of fully differentiated cell which may refer to the releasing phase of the fourth type, being characterized by the dispersion or loss of minute secretory granules of low density as large as50nm in diameter, associated with the cored vesicles. The population density of the above five types increased in the sequence, 5th→4th→2nd→1st→3rd type in the gland. Namely, the 3rd (corticotroph) type and 1st (agranular) type are predominantly distributed, and the5th (releasing) type and 4th (hypergranulated) type are rarely.
- 社団法人 日本内分泌学会の論文
著者
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Yoshimura Fujio
Department Of Anatomy Jikai University School Of Medicine
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NAGATA MASATO
Department of Anatomy, Jikei University School of Medicine
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MIZUNAGA ATUSHI
Department of Anatomy, Jikei University School of Medicine
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EMA SHOKO
Department of Anatomy, Jikei University School of Medicine
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