The effect of proteoglycans inhibited on the neurotropic growth of salivary adenoid cystic carcinoma

J Oral Pathol Med (2010) 40: 476–482 Objective: To evaluate the relationship between inhibition of proteoglycans which secreted by salivary adenoid cystic carcinoma cell line (SACC-83) and the neurotropic ability of the tumor cells. Methods: The expression vector of short hairpin RNA (shRNA-WJ4) targeting xylosyltransferase-I gene was constructed and transfected into SACC-83 cells (group SACC83-WJ4), shRNA-HK used as negative control was transfected into SACC-83 cells (group SACC-83-HK), SACC-83 cells without transfection was used as black control (group SACC-83). The xylosyltransferase-I gene expression was measured by real-time PCR. The content of proteoglycans was detected by Blyscan Assay Kit. The effect of down-regulated proteoglycans on the perineural invasion of nude mice was observed. All data were analyzed by the software spss 13.0. Results: The results showed that the transfected efficiency of shRNA was 43.3%. The expression of xylosyltransferase-I was inhibited by 43.0% 48 h after transfection of shRNA-WJ4. The content of proteoglycans was down-regulated by 30.25% 48 h after transfection. In the neurotropic experiment in vivo of nude mice, the rate of perineural invasion of group SACC-83-WJ4 was 33.33%, significantly lower than that of the negative control (100%) and the black control (100%) (P < 0.05). Conclusion: Xylosyltransferase-I gene of SACC cells was silenced by RNA interference technology, proteoglycans secretion was reduced and neurotropic invasion behavior of SACC was inhibited obviously.