title: Inhibitory effect of dimeric beta peptide on the recurrence and metastasis of hepatocellular carcinoma in vitro and in mice.
abstract: OBJECTIVE
  To block the adhesion of tumor cells to the extracellular matrix, and prevent tumor metastasis and recurrence, the dimer of the beta peptide (DLYYLMDLSYSMKGGDLYYLMDLSYSMK, beta2) was designed and synthesized and its anti-adhesion and anti-invasion effects on hepatocellular carcinoma cells were assessed. Additionally, its influence on the metastasis and recurrence of mouse hepatocellular carcinoma was measured.
  
  
  METHODS
  The anti-adhesion effect of beta2 on the highly metastatic hepatocellular carcinoma cell line HCCLM6 cells and fibronectin (FN) was assayed by the MTT assay. The inhibition of invasion of HCCLM6 cells by beta2 was observed using a Transwell (modified Boyden chamber) and matrigel. Using the hepatocellular carcinoma metastasis model and LCI-D20 nude mice, the influence of beta2 on the metastasis and recurrence of hepatocellular carcinoma after early resection was investigated.
  
  
  RESULTS
  HCCLM6 cells co-incubated with 100 mumol/L, 50 micromol/L, 20 micromol/L or 10 micromol/L beta2 for 3 h showed an obvious decrease in adhesion to FN. The adhesion inhibition ratios were 11.8%, 21.7%, 29.6% and 48.7%, respectively. Additionally, HCCLM6 cells cultured with 100 mumol/L beta2 had a dramatic decrease in cell invasion. beta2 was also observed to inhibit the incisal edge recurrence and the distant metastasis of nude mice hepatocellular carcinoma after early resection (P < 0.05).
  
  
  CONCLUSIONS
  The beta2 peptide can specifically block the adhesion and invasion of HCCLM6 cells, and can inhibit HCC recurrence and metastasis of LCI-D20 model posthepatectomy in vivo. Thus, beta2 should be further studied as a new anti-tumor drug.
authors.affiliation: Department of Pharmacy, Shanghai Chest Hospital, Shanghai 200031, China. jone_zhu@126.net.
authors.forename: Song-Mei
authors.initials: SM
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Zhu
authors.forename: Luan-Feng
authors.initials: LF
authors.lastname: Pan
authors.forename: Yin-Kun
authors.initials: YK
authors.lastname: Liu
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D006528:Carcinoma, Hepatocellular / Q000188:drug therapy* / Q000473:pathology / Q000601:surgery; D002448:Cell Adhesion / Q000187:drug effects; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000187:drug effects; D019281:Dimerization; D004305:Dose-Response Relationship, Drug; D006498:Hepatectomy; D006801:Humans; D008114:Liver Neoplasms, Experimental / Q000188:drug therapy* / Q000473:pathology / Q000601:surgery; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009361:Neoplasm Invasiveness; D009362:Neoplasm Metastasis / Q000517:prevention & control; D009364:Neoplasm Recurrence, Local / Q000517:prevention & control*; D010455:Peptides / Q000494:pharmacology*
chemical_list: D000970:Antineoplastic Agents; D010455:Peptides