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[Expression of Smad4 and Smad7 of BMP signaling pathway in oral squamous cell carcinoma]

Duan-qin Liu1, Jun Zhang, Hong-ning Song

  • 1Department of Oral and Maxillofacial Surgery, School of Stomatology, Shandong University. Jinan 250012;China.E-mail:liuduanqin1987@126.com.

Shanghai Kou Qiang Yi Xue = Shanghai Journal of Stomatology
|November 16, 2013
PubMed
Abstract

Insights

Smad4 expression decreases while Smad7 expression increases in oral squamous cell carcinoma (OSCC), suggesting their roles in OSCC development and metastasis. This indicates potential therapeutic targets within the BMP/Smads signaling pathway.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Signaling

Background:

  • Oral squamous cell carcinoma (OSCC) is a prevalent malignancy with complex molecular underpinnings.
  • The transforming growth factor-beta (TGF-β) signaling pathway, mediated by Smad proteins, plays a critical role in cell growth, differentiation, and tumorigenesis.
  • Understanding the specific roles of Smad4 and Smad7 in OSCC is crucial for identifying potential therapeutic strategies.

Purpose of the Study:

  • To analyze the differential expression of Smad4 and Smad7 in OSCC tissues compared to adjacent normal tissues.
  • To investigate the correlation between Smad4 and Smad7 expression levels and clinicopathological features of OSCC, including differentiation and lymph node metastasis.
  • To elucidate the potential impact of Smad4 and Smad7 on the occurrence and progression of oral squamous cell carcinoma.

Main Methods:

  • A cohort of 72 pathologically confirmed OSCC cases was studied.
  • SP immunohistochemistry was employed to detect and quantify Smad4 and Smad7 protein expression in both cancerous and adjacent normal tissues.
  • Statistical analysis was performed using SPSS software to assess the significance of observed expression changes and their correlations.

Main Results:

  • Smad4 expression was significantly lower in OSCC tissues (45.83%) compared to normal tissues (69.44%), with reduced expression correlating with decreased differentiation and lymph node metastasis.
  • Conversely, Smad7 expression was significantly higher in OSCC tissues (83.33%) than in normal tissues (19.44%), with elevated expression associated with poor differentiation and lymph node metastasis.
  • These findings indicate opposing roles for Smad4 and Smad7 in OSCC progression.

Conclusions:

  • Downregulation of Smad4 and overexpression of Smad7 are implicated in the development and metastasis of oral squamous cell carcinoma.
  • The observed alterations suggest that the inhibition of the BMP/Smads signaling pathway may contribute to the continuous occurrence and development of OSCC.
  • Targeting Smad4 and Smad7 or modulating the BMP/Smads pathway presents a potential therapeutic avenue for OSCC.

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