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Function of Transforming Growth Factor β2 and β3 in Palatogenesis
Miwaki Aoki1, Akira Nakajima1,2, Nichika Fukumashi3
1Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan.
Introduction:
This study aimed to examine the transforming growth factor (TGF)-β signaling pathway during secondary palate fusion by transfecting single and double small interfering RNA (siRNAs) for TGF-β2 and -β3. This investigation also focused on understanding the phenotype of palatal development.
Methods:
siRNAs targeting TGF-β2 and -β3 were used in an organ culture model of fusion of the secondary palate of 13-day embryonic ICR mice cultured for up to 72 h. The palatal shelves were collected at different times following the initiation of organ culture and were examined for TGF-β2 and -β3 gene expression. Downstream signaling was characterized using Western blotting and PCR.
Results:
In the double siRNA-treated palatal shelves, approximately 90% (91% anterior, 89% posterior with phenotype A) showed fusion failure in hematoxylin and eosin staining. Phosphorylation of Smad-dependent and -independent signaling showed a significant reduction in phosphorylation in double knockdown palate organ cultures when compared to single knockdown cultures. Although, the expression of matrix metalloproteinase 13 and TIMP2 were small influenced by siTGF-β2, the extracellular matrix and transcription factor expressions showed to be significantly reduced in double knockdown palate compared to single knockdown palates.
Conclusions:
This study demonstrates that double siRNAs targeting TGF-β2 and -β3 results in phenotypes during secondary palatal fusion and that they could be affected phosphorylation of Smad-dependent and -independent signaling synergistically compared to single knockdown of TGF-β2 and -β3. The results of this study demonstrate important functions during secondary palatal fusion and will contribute to our understanding of the etiology of cleft palate.
Insights
Double knockdown of TGF-β2 and TGF-β3 using small interfering RNA (siRNA) significantly impairs secondary palate fusion. This synergistic effect impacts Smad signaling and extracellular matrix development, offering insights into cleft palate etiology.
Area of Science:
- Developmental Biology
- Molecular Signaling
- Genetics
Background:
- Secondary palate fusion is crucial for oral and nasal cavity separation.
- Transforming growth factor-beta (TGF-β) signaling pathways play a vital role in embryonic development, including palate formation.
- Disruptions in palate development can lead to congenital conditions like cleft palate.
Purpose of the Study:
- To investigate the role of TGF-β2 and TGF-β3 in secondary palate fusion.
- To analyze the downstream effects of TGF-β2 and TGF-β3 signaling on palatal development phenotypes.
- To understand the synergistic impact of TGF-β2 and TGF-β3 on Smad-dependent and -independent signaling pathways.
Main Methods:
- Organ culture model using embryonic ICR mouse secondary palates.
- Transfection with single and double small interfering RNAs (siRNAs) targeting TGF-β2 and TGF-β3.
- Analysis of gene and protein expression via Western blotting and PCR, alongside histological examination.
Main Results:
- Double siRNA targeting TGF-β2 and TGF-β3 resulted in approximately 90% fusion failure in palatal shelves.
- Significant reduction in phosphorylation of Smad-dependent and -independent signaling pathways was observed in double knockdown cultures.
- Extracellular matrix and transcription factor expressions were significantly reduced in double knockdown palates compared to single knockdown.
Conclusions:
- Combined knockdown of TGF-β2 and TGF-β3 synergistically impairs secondary palate fusion, leading to specific developmental phenotypes.
- TGF-β2 and TGF-β3 signaling pathways are critical for normal palatal fusion, with synergistic effects on downstream signaling.
- This study provides valuable insights into the molecular mechanisms underlying secondary palate fusion and the etiology of cleft palate.
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