Role of region-distinctive expression of Rac1 in regulating fibronectin arrangement during palatal shelf elevation

Qinghuang Tang, Liwen Li, Chengri Jin, Jong Min Lee, Han Sung Jung

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Palatal shelf elevation is a crucial process in palate development, with the contribution of various factors. Disturbances in any factor during this process result in cleft palate. Prior to palatal shelf elevation starting from embryonic day 12.5, the Rac1 expression level in the bend region of the mid-palatal shelf progressively increases and the cell densities in the bend and groove regions gradually become higher than those in the middle region. The comparative decrease of cell density in the middle region is correlated with a gradual alteration of the arrangement of fibronectin (FN) fibers, whereas the bend and groove regions with higher cell densities maintain ring-like FN arrangements. Rac1 overexpression alters the fibrillar FN arrangement in the middle region to the ring-like arrangement by increasing cell density. This alteration is sufficient to induce the failure of palatal shelf elevation, ultimately leading to cleft palate. Furthermore, the inhibition of FN delays palatal shelf elevation. Thus, the spatiotemporal expression of Rac1 plays an impressive role in palatal shelf elevation by regulating FN arrangement within the palatal shelf.

Original languageEnglish
Pages (from-to)857-868
Number of pages12
JournalCell and Tissue Research
Issue number3
Publication statusPublished - 2015 Sept 28

Bibliographical note

Funding Information:
This work was supported under the framework of an international cooperation program managed by the National Research Foundation of Korea (NRF-616-2011-3-E00014).

Publisher Copyright:
© 2015, Springer-Verlag Berlin Heidelberg.

All Science Journal Classification (ASJC) codes

  • Pathology and Forensic Medicine
  • Histology
  • Cell Biology


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