Mesothelin is a malignant factor and therapeutic vaccine target for pancreatic cancer.
Given the high fatality rate of pancreatic cancer, an effective treatment for this devastating disease is urgently needed. We have shown that mesothelin expression was higher in human pancreatic cancer cells than in human pancreatic duct epithelial cells, and mesothelin mRNA was substantially overexpressed in 18 of 21 (86%) clinical pancreatic adenocarcinoma specimens when compared with the surrounding normal tissues. However, the biological functions of mesothelin in tumor progression are not clearly understood. Here we studied the effects of mesothelin overexpression in pancreatic cancer cell proliferation and migration in vitro and pancreatic cancer progression in vivo. We found that forced expression of mesothelin significantly increased tumor cell proliferation and migration by 90% and 300%, respectively, and increased tumor volume by 4-fold in the nude mice xenograft model when compared with the vector control cell line. Silencing of mesothelin inhibited cell proliferation and migration in pancreatic cancer cells and ablated tumor progression in vivo. Vaccination with chimeric virus-like particles that contain human mesothelin substantially inhibited tumor progression in C57BL/6J mice. The increases in mesothelin-specific antibodies and CTL activity and the decrease in regulatory T cells correlated with reduced tumor progression and prolonged survival. This study revealed novel functions of mesothelin and suggested a new therapeutic vaccine strategy whereby mesothelin is targeted to control pancreatic cancer progression.
Li
Min
M
Molecular Surgeon Research Center, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX 77030, USA.
Bharadwaj
Uddalak
U
Zhang
Rongxin
R
Zhang
Sheng
S
Mu
Hong
H
Fisher
William E
WE
Brunicardi
F Charles
FC
Chen
Changyi
C
Yao
Qizhi
Q
D000230:Adenocarcinoma / Q000235:genetics* / Q000628:therapy*; D000818:Animals; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000235:genetics; D049109:Cell Proliferation; D002471:Cell Transformation, Neoplastic / Q000235:genetics*; D002478:Cells, Cultured; D018450:Disease Progression; D058851:GPI-Linked Proteins; D015972:Gene Expression Regulation, Neoplastic; D020868:Gene Silencing / Q000502:physiology; D006801:Humans; D016233:Immunotherapy, Active; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics / Q000502:physiology*; D000090204:Mesothelin; D051379:Mice; D008810:Mice, Inbred C57BL; D008819:Mice, Nude; D010190:Pancreatic Neoplasms / Q000235:genetics* / Q000628:therapy*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000276:immunology; D014162:Transfection; D014771:Virion / Q000235:genetics; D023041:Xenograft Model Antitumor Assays
D058851:GPI-Linked Proteins; D008562:Membrane Glycoproteins; C000715528:Msln protein, mouse; D011993:Recombinant Fusion Proteins; D000090204:Mesothelin