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Active participation of apoptosis and mitosis in sublingual gland regeneration of the rat following release from duct ligation

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Summary

This study was designed to establish how mitotic cell proliferation and apoptotic cell death participate in the regeneration of atrophied rat sublingual glands. To induce atrophy to the sublingual gland of rats, the excretory duct was ligated unilaterally near the hilum, and after 1 week of ligation (day 0) the duct ligation was released to enable gland regeneration. The regenerating glands were examined with routine histology, immunohistochemistry for proliferating cell nuclear antigen (PCNA) as a marker of proliferating cells, terminal deoxynucleotidyl transferase-mediated dUTP-digoxigenin nick end labeling (TUNEL) as a marker of apoptotic cells, and transmission electron microscopy. At day 0, a few acini and many ducts remained in the atrophic sublingual glands, and newly formed immature acini were observed at day 3. Thereafter acinar cells progressively matured and increased in number, although the number of ducts decreased. Many PCNA- and some TUNEL-positive cells were seen in acini and ducts during regeneration. The labeling indices for both cell types were statistically significantly different from that of the control at several time points of the regeneration. Apoptotic and mitotic cells were also confirmed to be present in the experimental sublingual glands by electron microscopy. These observations suggest that apoptosis as well as mitosis of duct and acinar cells actively participate in and play important roles in sublingual gland regeneration.

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Authors and Affiliations

  1. Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Sapporo, 060-8586, Japan

    S. Takahashi, T. Domon, T. Yamamoto & M. Wakita

  2. Department of Oral Physiology, Showa University School of Dentistry, Tokyo, 142-8555, Japan

    S. Nakamura

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  1. S. Takahashi
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  2. S. Nakamura
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  3. T. Domon
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  4. T. Yamamoto
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  5. M. Wakita
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Correspondence to S. Takahashi.

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Takahashi, S., Nakamura, S., Domon, T. et al. Active participation of apoptosis and mitosis in sublingual gland regeneration of the rat following release from duct ligation. J Mol Hist 36, 199–205 (2005). https://doi.org/10.1007/s10735-005-1764-6

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  • DOI: https://doi.org/10.1007/s10735-005-1764-6

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