Increased expression of sialic acid in cervical biopsies with squamous intraepithelial lesions

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• 作者：Dolores López-Morales (1) (2)
  Julio Reyes-Leyva (1)
  Gerardo Santos-López (1)
  Edgar Zenteno (2)
  Verónica Vallejo-Ruiz (1)
  
• 刊名：Diagnostic Pathology
• 出版年：2010
• 出版时间：December 2010
• 年：2010
• 卷：5
• 期：1
• 全文大小：629KB
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• 作者单位：Dolores López-Morales (1) (2)
  Julio Reyes-Leyva (1)
  Gerardo Santos-López (1)
  Edgar Zenteno (2)
  Verónica Vallejo-Ruiz (1)
  
  1. Laboratorio de Biología Molecular y Virología, Centro de Investigación Biomédica de Oriente, Instituto Mexicano del Seguro Social, Km 4.5 Carretera Federal Atlixco-Metepec, C.P. 74360, Metepec, Puebla, México
  2. Departamento de Bioquímica, Facultad de Medicina, UNAM, Laboratorio de Inmunología, 04510, México
  

文摘

Background Altered sialylation has been observed during oncogenic transformation. Sialylated oligosaccharides of glycoproteins and glycolipids have been implicated in tumor progression and metastases. In the cervical cancer high levels of sialic acid have been reported in the patients serum, and an increased of total sialic acid concentration has been reported for the cervical neoplasia and cervical cancer. This study investigates the changes in expression and distribution of α2,3-linked sialic acid and α2,6- linked sialic acid in low and high squamous intraepithelial lesions and in normal tissue. Methods Lectin histochemistry was used to examine the expression and distribution of sialic acid in different grades of cervical neoplasia. We applied Maackia amurensis lectin, which interacts with α2,3-linked sialic acid and Sambucus nigra lectin specific for α2,6-linked sialic acid. Results The histochemical analysis showed that α2,3-linked sialic acid and α2,6- linked sialic acid increased in intensity and distribution in concordance with the grade of squamous intraepithelial lesion (SIL). These results are in concordance with a previous study that reports increased RNAm levels of three sialyltransferases. Conclusions These results show that the change in sialylation occurs before cancer development and may play an important role in cellular transformation. These findings provide the basis for more detailed studies of the possible role of cell surface glycoconjugates bearing sialic acid in the cellular cervix transformation.