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Helical structure in the apical tubules of several absorbing epithelia

Kidney proximal tubule, visceral yolk sac and ductuli efferentes

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Summary

Unique and highly ordered structures were discovered in the so-called apical tubules of several absorbing epithelia (kidney proximal tubule, visceral yolk sac and ductuli efferentes) fixed in situ with a mixture of formaldehyde, glutaraldehyde and osmium tetroxide. The apical tubules were especially numerous in the apical cytoplasm, in addition to the invaginations of the apical plasma membrane, newly formed endocytic vesicles and large endocytic vacuoles. They showed a cylindrical structure (∼80 nm in diameter) limited by a smooth membrane. Helically wound parallel rows of particles (∼11 nm in diameter) were found in the apical tubules in close proximity to their limiting membrane. The structure of the helix was determined by following the rows through serial sections and semithin sections, and was found to be a left-handed quadruple helix. These particles surround an electron-lucent cylinder (∼35 nm in diameter), containing at its center a single row of particles (∼9 nm in diameter). The apical tubules with the luminal specializations were not seen in continuity with the apical plasma membrane, but were frequently connected with the large endocytic vacuoles, which were present in the deeper levels of the apical cytoplasm. From these observations, it is suggested that the apical tubules are not derivatives of the apical plasma membrane; rather, they represent an intracellular compartment, which is morphologically related to the large endocytic vacuoles.

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Hatae, T., Fujita, M. & Sagara, H. Helical structure in the apical tubules of several absorbing epithelia. Cell Tissue Res. 244, 39–46 (1986). https://doi.org/10.1007/BF00218379

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