Live imaging of alterations in cellular morphology and organelles during cornification using an epidermal equivalent model

The stratum corneum plays a crucial role in epidermal barrier function. Various changes occur in granular cells at the uppermost stratum granulosum during cornification. To understand the temporal details of this process, we visualized the cell shape and organelles of cornifying keratinocytes in a l...

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Bibliographic Details
Published in:Scientific reports 2020-03, Vol.10 (1), p.5515-5515, Article 5515
Main Authors: Ipponjima, Sari, Umino, Yuki, Nagayama, Masaharu, Denda, Mitsuhiro
Format: Article
Language:English
Subjects:
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631/80/642
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Cell Shape
Cell size
Cells, Cultured
Cytology
Filaggrin
Humanities and Social Sciences
Humans
Keratinocytes
Keratinocytes - cytology
Keratinocytes - metabolism
Keratinocytes - ultrastructure
Microscopy
Mitochondria
Models, Biological
Morphology
multidisciplinary
Organelles
Organelles - metabolism
Organelles - ultrastructure
S100 Proteins - metabolism
Science
Science (multidisciplinary)
Stratum corneum
Time-Lapse Imaging - methods
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Summary:The stratum corneum plays a crucial role in epidermal barrier function. Various changes occur in granular cells at the uppermost stratum granulosum during cornification. To understand the temporal details of this process, we visualized the cell shape and organelles of cornifying keratinocytes in a living human epidermal equivalent model. Three-dimensional time-lapse imaging with a two-photon microscope revealed that the granular cells did not simply flatten but first temporarily expanded in thickness just before flattening during cornification. Moreover, before expansion, intracellular vesicles abruptly stopped moving, and mitochondria were depolarized. When mitochondrial morphology and quantity were assessed, granular cells with fewer, mostly punctate mitochondria tended to transition to corneocytes. Several minutes after flattening, DNA leakage from the nucleus was visualized. We also observed extension of the cell-flattening time induced by the suppression of filaggrin expression. Overall, we successfully visualized the time-course of cornification, which describes temporal relationships between alterations in the transition from granular cells to corneocytes.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-62240-3