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Published on: October 30, 2013
Human MUC4 mucin induces ultra-structural changes and tumorigenicity in pancreatic cancer cells
N Moniaux1, P Chaturvedi, G C Varshney
1Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE 68198, USA.
Abstract:
MUC4 is a type-1 transmembrane glycoprotein and is overexpressed in many carcinomas. It is a heterodimeric protein of 930 kDa, composed of a mucin-type subunit, MUC4alpha, and a membrane-bound growth factor-like subunit, MUC4beta. MUC4 mRNA contains unique 5' and 3' coding sequences along with a large variable number of tandem repeat (VNTR) domain of 7-19 kb. A direct association of MUC4 overexpression has been established with the degree of invasiveness and poor prognosis of pancreatic cancer. To understand the precise role of MUC4 in pancreatic cancer, we engineered a MUC4 complementary DNA construct, mini-MUC4, whose deduced protein (320 kDa) is comparable with that of wild-type MUC4 (930 kDa) but represents only 10% of VNTR. Stable ectopic expression of mini-MUC4 in two human pancreatic cancer cell lines, Panc1 and MiaPaCa, showed that MUC4 minigene expression follows a biosynthesis and localisation pattern similar to the wild-type MUC4. Expression of MUC4 resulted in increased growth, motility, and invasiveness of the pancreatic cancer cells in vitro. Ultra-structural examination of MUC4-transfected cells showed the presence of increased number and size of mitochondria. The MUC4-expressing cells also demonstrated an enhanced tumorigenicity in an orthotopic xenograft nude mice model, further supporting a direct role of MUC4 in inducing the cancer properties. In conclusion, our results suggest that MUC4 promotes tumorigenicity and is directly involved in growth and survival of the cancer cells.
Insights
Mucin 4 (MUC4) overexpression fuels pancreatic cancer growth, motility, and invasiveness. This study engineered a MUC4 minigene to demonstrate its direct role in promoting tumor progression and cell survival.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Mucin 4 (MUC4) is a type-1 transmembrane glycoprotein overexpressed in various carcinomas.
- MUC4 overexpression correlates with increased invasiveness and poor prognosis in pancreatic cancer.
- Understanding MUC4's role is crucial for developing targeted pancreatic cancer therapies.
Purpose of the Study:
- To investigate the precise function of MUC4 in pancreatic cancer progression.
- To engineer a functional MUC4 complementary DNA construct (mini-MUC4) for experimental studies.
- To assess the impact of MUC4 expression on pancreatic cancer cell behavior and tumorigenicity.
Main Methods:
- Engineered a mini-MUC4 construct representing 10% of the variable number of tandem repeat (VNTR) domain.
- Achieved stable ectopic expression of mini-MUC4 in human pancreatic cancer cell lines (Panc1, MiaPaCa).
- Evaluated MUC4 expression, cell growth, motility, invasiveness, mitochondrial ultrastructure, and in vivo tumorigenicity.
Main Results:
- Mini-MUC4 expression mimicked wild-type MUC4 biosynthesis and localization.
- MUC4 expression significantly enhanced pancreatic cancer cell growth, motility, and invasiveness in vitro.
- MUC4-expressing cells exhibited increased mitochondria and enhanced tumorigenicity in an orthotopic xenograft model.
Conclusions:
- MUC4 plays a direct role in promoting pancreatic cancer tumorigenicity.
- MUC4 is involved in the growth, survival, and invasive properties of pancreatic cancer cells.
- Targeting MUC4 may offer a therapeutic strategy for pancreatic cancer.
