Plasmid-encoding vasostatin inhibited the growth and metastasis of human hepatocellular carcinoma cells

Mol Cell Biochem. 2014 Oct;395(1-2):265-72. doi: 10.1007/s11010-014-2135-y. Epub 2014 Jul 6.

Abstract

The growth and metastasis of solid tumors depends on angiogenesis. Anti-angiogenesis therapy may represent a promising therapeutic option. Vasostatin, the N-terminal domain of calreticulin, is a very potent endogenous inhibitor of angiogenesis and tumor growth. In this study, we attempted to investigate whether plasmid-encoding vasostatin complexed with cationic liposome could suppress the growth and metastasis of hepatocellular carcinoma in vivo and discover its possible mechanism of action. Apoptosis induction of pSecTag2B-vasostatin plasmid on murine endothelial cells (MS1) was examined by flow cytometric analysis in vitro. Nude mice bearing HCCLM3 tumor received pSecTag2B-vasostatin, pSecTag2B-Null, and 0.9 % NaCl solution, respectively. Tumor net weight was measured and survival time was observed. Microvessel density within tumor tissues was determined by CD31 immunohistochemistry. H&E staining of lungs and TUNEL assay of primary tumor tissues were also conducted. The results displayed that pSecTag2B-vasostatin could inhibit the growth and metastasis of hepatocellular carcinoma xenografts and prolong survival time compared with the controls in vivo. Moreover, histologic analysis revealed that pSecTag2B-vasostatin treatment increased apoptosis and inhibited angiogenesis. The present data may be of importance to the further exploration of this new anti-angiogenesis approach in the treatment of hepatocellular cancer.

MeSH terms

  • Animals
  • Calreticulin / genetics*
  • Calreticulin / metabolism
  • Calreticulin / pharmacology
  • Carcinoma, Hepatocellular / pathology
  • Carcinoma, Hepatocellular / therapy*
  • Cell Line, Tumor
  • Cell Proliferation / drug effects
  • Female
  • Genetic Therapy
  • Genetic Vectors / administration & dosage
  • Humans
  • Liposomes / administration & dosage*
  • Liver Neoplasms / pathology
  • Liver Neoplasms / therapy*
  • Mice
  • Neoplasm Metastasis
  • Neoplasms, Experimental
  • Peptide Fragments / genetics*
  • Peptide Fragments / metabolism
  • Peptide Fragments / pharmacology
  • Plasmids / genetics

Substances

  • Calreticulin
  • Liposomes
  • Peptide Fragments
  • vasostatin